US20120029556A1 - Sealing device and delivery system - Google Patents

Abstract

The invention relates to a sealing device for repair of cardiac and vascular defects or tissue opening such as a patent foramen ovale (PFO) or shunt in the heart, the vascular system, etc. and particularly provides an occluder device and trans-catheter occluder delivery system. The sealing device would have improved conformity to heart anatomy and be easily deployed, repositioned, and retrieved at the opening site.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
• This application is a Continuation in Part of U.S. patent application Ser. No. 12/498,586, filed Jul. 7, 2009, which claims priority to provisional application U.S. Ser. No. 61/219,120, filed Jun. 22, 2009.
FIELD OF THE INVENTION
• The Invention relates to a sealing device for repair of cardiac and vascular defects or tissue opening such as a patent foramen ovale (PFO) or shunt in the heart, the vascular system, etc. and particularly provides an occluder device and trans-catheter occluder delivery system.
BACKGROUND OF THE INVENTION
• Sealing devices may be utilized for the occlusion of many types of tissue openings, such as septal defects, PFO, and the like.
• Tissue openings have traditionally been corrected by open-heart surgery. In order to avoid the trauma and complications associated with open-heart surgery, a variety of trans-catheter closure techniques have been implemented. In such techniques, an occluding device is delivered through a catheter to the site of the opening or defect. A device is placed into the defect and permanently deployed.
• A variety of trans-catheter delivered devices are known. These include devices that require assembly at the site of the tissue opening or require threading or “buttoning” of the discrete device elements. Other devices include self-expanding devices. These self-expanding devices tend to be difficult to visualize, cumbersome to load, difficult to position at the site of a tissue opening, and reposition. Most self-expanding devices do not conform to heart anatomy leading to tissue erosion.
• An example of a self-expanding device includes an occlusion bag, a third tube, a guide catheter, a super elastic wire, a release mechanism and a delivery sheath. The super elastic wire is attached to the release mechanism and the wire, release mechanism, occlusion bag, guide catheter and third tube are inserted into a delivery sheath for transport to the aperture. After delivery, the occlusion bag is placed within the aperture and the wire is deployed within the bag. The bag and wire are repositioned if necessary, and the release mechanism is activated to release the wire.
• Another example of a self-expanding device includes a shape set tubular metal fabric device and optionally, an occluding fiber included in the hollow portions of the device. The metal fabric defines a medical device shaped like a bell, which can be collapsed for passage through a catheter for deployment in a channel of a patient's body.
• While these and other self-expanding devices are designed for trans-catheter delivery, they require assembly either prior to use or during use. They are also difficult to reposition or retrieve once deployed and provide poor conformity to heart anatomy. For these reasons, it would be desirable to provide an improved sealing device for use in trans-catheter techniques. Such sealing devices would preferably have improved conformity to heart anatomy and be easily deployed, repositioned, and retrieved at the opening site.
• Trans-catheter self-expanding sealing devices may be delivered and deployed by a variety of means. Most trans-catheter delivery devices choose one of two basic systems for deploying the device: pulling back an outer catheter to release the device or pushing the device free of the catheter with a push rod. Each of these systems utilizes a handle to actuate the mechanism used to deploy the device. An example of such a system includes a flexible urging member for urging the sealing device through a catheter and a remotely located control means for advancing the urging member. In this example, the control means includes a threaded, tubular shaft connected to the urging member and a manually rotatable threaded rotor mounted on the shaft. The threads on the rotor mate with the threads on the shaft so that the rotation of the rotor through a known angle will advance the shaft and the urging member a known distance.
• An example of a system that utilizes a pull back outer shaft or catheter includes a handle that may selectively hold the delivery system components at any configuration during deployment and positioning of the device. The outer catheter of such a system would be pulled back to release the device by actuating a sliding lever and a rotating finger ring on the delivery system handle.
• While these and other device delivery systems are designed for trans-catheter device deployment, they require the use of a threaded rotor, which can become difficult to rotate or they require large forces to pull back the outer catheter to expose the entire length of the constrained device. Most deployment systems are either not reversible or very difficult to reverse once the deployment procedure has taken place. For these reasons, it would be desirable to provide an improved delivery system for a sealing device. Such delivery system would preferably have a handle able to be operated simply with a single hand and would be able to execute multiple manipulations with minimal force or hand movement.
SUMMARY OF THE INVENTION
• A first embodiment provides a sealing device having an expandable frame formed from a plurality of wires extending from a proximal end to a distal end of the frame with the wires forming a proximal and distal eyelet with a sealing member at least partially encapsulating the expandable wire frame.
• A further embodiment provides a handle for deploying a sealing device having a housing having a slot and a length with a linear actuator located within the slot and the linear actuator capable of independently advancing and retracting at least three separate components by advancing and retracting the actuator along the slot length.
• An additional embodiment provides an apparatus comprising a handle having a housing having a slot with a length and a linear actuator located within the slot the linear actuator capable of independently advancing and retracting at least three separate components by advancing and retracting the actuator along the slot length. The apparatus also comprising a sealing device having an expandable frame formed from a plurality of wires extending from a proximal end to a distal end of the frame with the wires forming a proximal and distal eyelet with a sealing member at least partially encapsulating the expandable wire frame.
• Additional features and advantages of the invention will be set forth in the description or may be learned by practice of the invention. These features and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
• It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
• The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.
• In the drawings:
• FIG. 1 is a perspective view of a deployed sealing device attached to the distal end of a delivery system.
• FIG. 2A is a view of an expanded frame of a sealing device.
• FIG. 2B is an end on view of an eyelet of a sealing device.
• FIG. 2C is a end on view of a frame of a sealing device.
• FIGS. 3A-B are views of components of a winding jig.
• FIG. 4A is a side view of a winding jig.
• FIG. 4B is a top view of a winding jig.
• FIG. 5A is a side view of an expanded covered sealing device.
• FIG. 5B is a side view of an expanded partially covered sealing device.
• FIG. 6 is a side view of a self-centering embodiment of a sealing device.
• FIG. 7 is a side view of a deployed sealing device.
• FIG. 8 is a perspective view of a delivery system including a deployment handle and attached sealing device.
• FIG. 9A-D are flow charts describing the operation of the delivery system.
• FIG. 10 is a perspective view of a sealing device deployment handle.
• FIG. 11 is a perspective view of an assembly of a sealing device deployment handle.
• FIG. 12A is a top down view of an embodiment of a first linear actuator.
• FIG. 12B is a side view of an embodiment of a first linear actuator.
• FIG. 12C is a side view of an embodiment of a first linear actuator.
• FIG. 12D is a side view of an embodiment of a first linear actuator.
• FIG. 13A is a perspective view of an embodiment of a lock release actuator.
• FIG. 13B is a perspective view of an embodiment of a lock release actuator in the activated position.
• FIG. 14A is a perspective view of an embodiment of a spring.
• FIG. 14B is an end on view of an embodiment of a first linear actuator.
• FIG. 15 is an end on view of an embodiment of a first linear actuator with molded spring component.
• FIG. 16 is a perspective view of a spring component.
• FIG. 17 is a schematic of a base jig assembly including winding jig, wire weight and wire guide.
• FIGS. 18A,18B and18C are schematics of a manufacturing mandrel and an embodiment of a lock loop.
• FIG. 19 is a perspective view of a base jig with a self centering petal jig attached.
• FIG. 20A is a perspective view of a wire frame of a sealing device in a deployed configuration.
• FIG. 20B is a side view of a wire frame of a sealing device shown elongated along a mandrel.
• FIG. 21 is a view of a wire frame of a sealing device.
• FIG. 22A is a side view of a wire frame of a sealing device shown elongated along a mandrel.
• FIG. 22B is an illustration of an embodiment of a base jig.
• FIG. 23A is an end on view of a sealing device.
• FIG. 23B is a side view of the sealing device ofFIG. 23A in an elongated configuration on a mandrel.
• FIG. 24A is a perspective view of a base jig.
• FIG. 24B is a side view of a lock loop forming tool.
• FIGS. 25A and 25B show elements of a wire frame forming device and a wire frame of a sealing device.
• FIGS. 26A-C illustrate an anchor component and method of attaching anchor component to a sealing device.
• FIG. 27 is an end view of a sealing device wire frame with an anchor component attached.
• FIG. 28 is a side view of a covered sealing device with anchor component attached.
• FIGS. 29A-C are illustrations of anchor component forming tools.
• FIG. 30 is a perspective view of an anchor component.
• FIG. 31 is a perspective view of a wire frame with anchor components attached.
• FIG. 32 is a perspective view of a winding path and jig for winding a sealing device with elongated waist area.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
• A first embodiment provides a sealing device having an expandable frame formed from a plurality of wires extending from a proximal end to a distal end of the frame with the wires forming a proximal and distal eyelet with a sealing member at least partially encapsulating the expandable wire frame.
• FIG. 1 shows one embodiment of sealingdevice100.Sealing device100 will be discussed in detail in a later section.Sealing device100 may housed withinthird tube104.Third tube104 contains sealingdevice100,first tube102,second tube108,retrieval cord110 and lockingloop111.Third tube104 may be manufactured of Pebax® or any other material with suitable biocompatible and mechanical properties. A material choice with radiopacity may also be an option. Thethird tube104 may be manufactured with or without a reinforcing braid to provide appropriate kink resistance and strength for the chosen application.Third tube104 may also be designed with or without a radiopaque marker band. The design and materials ofthird tube104 may be chosen for other properties such as torqueability, steerability and vascular trauma reduction. One skilled in the art will appreciate that there are a wide variety of potential materials that may be used to facilitate the present invention. Thethird tube104 may be of any size but is preferably 10 fr. with an inner diameter of about 0.048 mm and an outer diameter of about 0.33 mm.Third tube104 may be used with or without a guidewire and may include arapid exchange port103. The tip offirst tube104 is preferably curved to aid in navigation and delivery of sealingdevice100 from the access site to the defect with or without a guidewire.
• Also shown inFIG. 1 isfirst tube102. As previously stated,first tube102 may be housed withinthird tube104. Thefirst tube102 may be of any outer diameter size but is preferably sized to fit within the lumen of thethird tube104.First tube102 may be manufactured of Pebax® or any other material with suitable biocompatible and mechanical properties.First tube102 is preferably a triple lumen catheter. The lumens may be of any geometric shape but are preferably round or oval or a combination of both.First tube102 may be used to position and aid in the deployment of sealingdevice100.First tube102 may be utilized in conjunction withsecond tube108 to causesealing device100 to protrude from the distal tip ofthird tube104 once sealingdevice100 has reached the defect site. Thefirst tube102 may also have the function of retainingsealing device100 onto the delivery system until final device deployment.First tube102 has anopening109 in the distal most end to allow thelocking loop111 to protrude during device deployment. Theopening109 and protruding lockingloop111 provide attachment to the device delivery system. Lockingloop111 is shown in its extended position prior to retaining its pre-set shape. Thefirst tube102 may be surface treated or coated to enhance the material's biocompatibility or alter or enhance the surface friction.
• First tube102 may house thesecond tube108. Thesecond tube108 is essentially tubular with an oval cross section and can have an outer diameter suitable to fit insidefirst tube102. A preferred outer diameter range would be from about 1.27×0.68 mm and would be flared at the distal end. Thesecond tube108 may be fabricated from any suitable biocompatible material including polymers or metals. A preferable material would be PEEK (polyetheretherketone).Second tube108 can be used to aid in the delivery and deployment of sealingdevice100 to a defect site.Second tube108 is threaded through the eyelets of sealingdevice100 to hold sealingdevice100 on the delivery system and to provide stability while deploying thesealing device100. Sealing device eyelets will be discussed further.
• Retrieval cord110 is looped through two of the smaller lumens of thefirst tube102 and through the proximal eyelet of thesealing device100 to provide attachment to the delivery system and a method of retrieval once the sealing device has been deployed.Retrieval cord110 extends through the length offirst tube102 with the ends terminating at the handle used for deployingsealing device100.Retrieval cord110 may be manufactured of any biocompatible material of sufficient strength and size. A preferable material is ePTFE (expanded polytetrafluoroethylene).
• As shown inFIG.2A sealing device100 is formed of awire frame200. When situated for delivery,wire frame200 is at an extended position onsecond tube108 and withinthird tube104.Wire frame200 may be of any size appropriate for an application but is preferably sized with finished outer diameters of 15, 20, 25, or 30 mm. Thewire frame200 is formed of continuous wires. Any number of wires may be used to construct thewire frame200. A preferable number of wires is five. Thewire frame200 can be constructed of wires that have elastic properties that allow forwire frame200 to be collapsed for catheter based delivery or thoracoscopic delivery, and self-expand to a “memory” induced configuration once positioned in a defect. The elastic wire may be a spring wire, or a shape memory NiTi (nitinol) alloy wire or a super-elastic NiTi alloy wire. The elastic wire may also be of a drawn-filled type of NiTi containing a different metal at the core. Preferably,wire frame200 would be constructed of a drawn-filled type of NiTi wire containing a radiopaque metal at the center. Upon deployment, the wire structure resumes its deployed shape without permanent deformation.
• Wire frame200 and other wire frames shown are formed from elastic wire materials that have outer diameters between 0.12 and 0.4 mm. In a preferable embodiment, wire outer diameter size would be about 0.3 mm. When formed,wire frame200 comprises adistal bumper208,distal eyelet204, lockingloop206, anoptional center eyelet203, andproximal eyelet202.FIG. 2B shows the position of elastic wires during the formation ofeyelets202,203 and204 ofwire frame200.
• FIG. 2C shows a disk formed whenwire frame200 is deployed. The elastic wires that formwire frame200form petals212 during deployment. The pre-set elastic wire configuration ofwire frame200 allows the frame to twist during deployment. This twist formspetals212. Deployedpetals212 form theouter diameter214 of thewire frame200. Deployedpetals212, when covered with sealingmember106, form proximal and distal disks, to be discussed further.Petals212 are optimally formed to have overlappingzones216 to improve sealing qualities. The radius ofpetals212 may be maximized to minimize sharp bend angles in the elastic wire and to minimize unsupported sections ofpetals212 that improve sealing qualities of the device, reduce bending fatigue in the wire and aid in reducing device loading forces. Deployedpetals212 form a disk on either side of thecenter eyelet203. The deployed configuration will be discussed further.
• Construction ofwire frame200 may be accomplished by a variety of means including machine winding with automatic wire tensioning or by hand winding with weights suspended from each wire during construction. Shown inFIGS. 3A-C are keyedcenter pin300 andbutton304, which may be used to aid in the construction ofwire frame200. One commonly skilled in the art would recognize that there are many materials suitable for use as a manufacturing aid or tooling. A preferable material for use in forming acenter pin300 would be cobalt high strength steel. A preferable material for use in forming abutton304 and winding jig would be corrosion resistant tool steel. The winding jig will be discussed further. Shown in detail inFIG. 3A, keyedcenter pin300 may havegroove302, which can be used to secure an elastic wire during device construction.Keyed center pin300 can be used to guide an elastic wire throughopening306 inbutton304, the features of which are illustrated inFIGS. 3B-C.Button304 is preferably formed with anindention308 in the bottom to fit securely in a winding jig. An elastic wire held ingroove302 and inserted throughopening306 inbutton304 can form abumper208 and lockingloop206.Keyed center pin300 is also used in the formation ofeyelets202,203 and204. During device construction, after the formation ofbumper208, elastic wires can be wound around keyedcenter pin300 to form adistal eyelet202. Other eyelets,203 and204 can be formed in a similar manner. Once keyedcenter pin300 is inserted inbutton304 an elastic wire may be inserted into grooves in a winding jig.
• A winding jig may be used to secure and form the elastic wires during construction and processing of thesealing device100. A typical winding jig may be constructed as commonly known in the arts. Materials used for construction of such a winding jig have been discussed previously. A preferable winding jig is shown inFIGS. 4A and 4B.FIG. 4A illustrates a side view of the windingjig400.FIG. 4B shows a view of the top of a preferable windingjig400. Windingjig400 contains anaperture402 that may be shaped and sized to hold keyedcenter pin300 andbutton304 during device construction.Grooves404 in the jig surface are used to secure and form the elastic wires intopetals212.Grooves404 may be of any diameter but are preferably sized to accommodate an outer diameter of elastic wire. In one embodiment shown inFIG. 5A, the winding jig assembly may be used to form acenter eyelet203, a petal assembly andproximal eyelet204. The shaped wire may be constrained in the winding jig assembly, heated and processed to shape set as commonly known in the arts.
• FIG. 5A shows an embodiment of sealingdevice100 which is a composite assembly ofwire frame200 and sealingmember106. Sealingmember106 may be attached towire frame200 by a bonding agent.Wire frame200 may be coated with a bonding agent, for example fluorinated ethylene propylene (FEP) or other suitable adhesive. The adhesive may be applied through contact coating, powder coating, dip coating, spray coating, or any other appropriate means. In a preferred embodiment, the FEP adhesive is applied by electrostatic powder coating. Sealingmember106 may be constructed of a variety of materials, such as DACRON®, polyester, polyethylene, polypropylene, fluoropolymers, polyurethane, foamed films, silicone, nylon, silk, thin sheets of super-elastic materials, woven materials, polyethylene terephthalate (PET), collagen, pericardium tissue or any other biocompatible material. In one embodiment, sealingmember106 can be formed of a thin porous ePTFE (expanded polytetrafluoroethylene) substrate. Sealingmember106 is designed to enhance the defect closure characteristics of sealingdevice100 by providing defect blockage and a medium for cellular in growth.
• Also shown inFIG. 5A are proximal, distal and center eyelets (202,203 and204) respectively covered with sealingmember106 and wrapped with a film. Theeyelets202,203 and204 may be wrapped with a film to encourage adhesion of sealingmember106 to the device. The film used to wrapeyelets202,203, and204 may be any biocompatible thin material but is a material preferably comprised of multiple layers of thin porous ePTFE that may be laminated with one or more layers of non-porous FEP.
• FIG. 5B illustrates an embodiment of sealingdevice100 that includes a sealingmember508 that partially coverswire frame200. A partially covered device may have either the distal or proximal bulb covered in part or in entirely with a sealingmember508.
• Another embodiment of the device is aself centering device600. Shown inFIG. 6,self centering device600 comprises awire frame602 similar to that ofwire frame200.Self centering device600 is a composite assembly ofwire frame602 and sealingmember604.Wire frame602 may be constructed with the same techniques and a material aswire frame200 but has no center eyelet.Wire frame602 comprisesdistal bumper606, covereddistal eyelet608, coveredproximal eyelet610, and lockingloop612. The pre-set elastic wire configuration ofwire frame602 allows the frame to twist upon deployment and create a centeringregion614 of thedevice600 during deployment. During deployment,region614 may center itself in the defect forming a disk comprised of petals on either side ofregion614 and the defect.
• FIG. 7 shows asealing device100 fully deployed. During deployment, the constraint of thethird tube104 is removed fromdevice100 and the device returns to its pre-set shape. During deployment and locking,lock loop111 is released from the constraint offirst tube102 and returns to its pre-set shape, curling from theproximal eyelet202. In this manner, the device is locked in a deployed state.FIG. 7 also illustrates the position of the proximal and distal disks,elements702 and704, in relation to the proximal, center, anddistal eyelets202,203, and204 respectively.
• FIG. 19 shows a base jig and other manufacturing aids used to manufacture an embodiment shown inFIGS. 20A and 20B and described in Example 4. As shown inFIGS. 20A and20B sealing device40 is formed ofwires43.Wire frame40 may be of any size appropriate for an application but is may be sized with outer peripheral edge diameters of 15, 20, 25, or 30 mm. Thewire frame40 is formed of continuous wires. Any number of wires may be used to construct thewire frame40.FIGS. 20A and 20B show a device formed from 5 continuous wires.FIG. 20A shows a device in a deployed configuration while20B shows a device in an extended configuration. Thewire frame40 may be constructed of wires that have elastic properties that allow forwire frame40 to be collapsed for catheter based delivery or thoracoscopic delivery, and self-expand to a “memory” induced configuration once positioned in a defect. The elastic wire may be a spring wire, or a shape memory NiTi (nitinol) alloy wire or a super-elastic NiTi alloy wire. The elastic wire may also be of a drawn-filled type of NiTi containing a different metal at the core.Wire frame40 may be constructed of a drawn-filled type of NiTi wire containing a radiopaque metal at the center. Upon deployment, the wire structure resumes its deployed shape without permanent deformation.
• Wire frame40 and other wire frames shown are formed from elastic wire materials that have outer diameters between 0.12 and 0.4 mm. When formed,wire frame40 comprises afirst eyelet41, asecond eyelet42, a plurality ofwires43, a closed teardrop shape with aninternal area44 and innerperipheral edge46 and an outerperipheral edge45. In an end view of a deployed device, the outerperipheral edge45 is shown as the outermost edge of thewire frame40. The innerperipheral edge46 ofwire frame40 is illustrated by the inner most edge of theinternal area44 of the closed teardrop shape. In the deployed configuration a wire and closed teardrop shape will nest or interleaf itself between the wire form of the next wire of the device. In a deployed configuration, the innerperipheral edge46 will at least in part center itself within a cardiac defect or other tissue gap.
• Thewire frame40 may be covered with a sealing member as previously described.
• FIG. 21 illustrates an embodiment of the wire frame described in example 5. The embodiment comprises a proximal610 anddistal eyelet608 with at least fivewires602, and a self centeringwaist portion614 similar to that describe previously in relation toFIG. 6. Such an embodiment may be manufactured of similar materials and methods as described previously.
• An alternate embodiment of a sealing device may be made by procuring two sealing device frames and seating one inside the other. Then covering the resulting frame as previously described. Such a device is described in example 6. An embodiment such as this may be manufactured with similar materials and methods as described previously and subsequently described. This technique may be used with any of the wire frames described herein.
• An embodiment is illustrated inFIG. 22A and described in example 8.FIG. 22A illustrates awire frame51 of a sealing device. The embodiment ofFIG. 22A comprises a proximal608 anddistal eyelet610, a plurality ofwires602, wires forming awire frame51, a self centeringwaist portion614, an reniform shape with an open internal area53 (not shown) with an innerperipheral edge54 and an outerperipheral edge55. The self centeringwaist portion614 of this embodiment forms a reniform with an open internal area53 when in the deployed configuration. In an end view of a deployed device, the outerperipheral edge55 is shown as the outermost edge of thewire frame51. The innerperipheral edge54 ofwire frame51 is illustrated by the inner most edge of the open internal area53 of the reniform shape. In a deployed configuration, the innerperipheral edge54 will at least in part center itself within a cardiac defect or other tissue gap.
• Thewire frame51, as illustrated inFIG. 22A, has a relatively short extended length prior to deployment. A delivery configuration length to deployed radius ratio is about 2.5. Such a device may be formed of similar materials as described previously and may be covered with a sealing member also described previously.
• A lock loop43 (illustrated inFIG. 18) may be manufactured separately from the wire frame of the sealing device. Thelock loop43 may be formed of any material suitable for forming a sealing device wire frame. Thelock loop43 may be made of a different material or have a different wire diameter than that of the sealing device wire frame.Lock loop component43 is manufactured with aneyelet49 similar to the eyelets of the sealing devices described herein.Lock loop43 may be attached to any sealing device wire frame prior to or post sealing member attachment. Any suitable method of attaching the separate lock loop component to the sealing device may be used. A method of manufacture of a lock loop component is described further in example 9.
• FIGS. 23A and B illustrates an embodiment comprising a proximal608 anddistal eyelet610, a plurality ofwires52, wires forming awire frame61, a self centeringwaist portion614, an reniform shape with an open internal area53 (not shown) with an innerperipheral edge54 and an outerperipheral edge55 and a sealingmember604. The self centeringwaist portion614 of this embodiment forms a reniform with an open internal area53 when in the deployed configuration. In an end view of a deployed device, the outerperipheral edge55 is shown as the outermost edge of thewire frame51. The innerperipheral edge54 ofwire frame51 is illustrated by the inner most edge of the open internal area53 of the reniform shape. In a deployed configuration, the innerperipheral edge54 will at least in part center itself within a cardiac defect or other tissue gap. This embodiment may be constructed with two frames previously described. This embodiment may be constructed of two frames wound in opposite directions or with two frames wound in the same direction. This and the other described wire frames may be constructed with the eyelets configured either as shown or with the eyelets turning toward the center area of the frame along the inner diameter of the device. Materials suitable for use as a sealingmember604 have been discussed previously. Sealing member may be attached to the frame in this and other described embodiments as discussed previously. Sealing member in this and other embodiments may be attached to the interior or inner surface of the wire frame and alternately to the exterior of the frame. The sealing member may be attached at only portions of the wire frame leaving certain portions of the wire frame more degrees of freedom of movement. Sealing member might also be attached to cover one side, portions or the entire wire frame.
• Another embodiment is shown inFIG. 25B. This embodiment may be constructed with similar materials as those described previously. The embodiment comprises awire frame78, first and second eyelets (73 and75 respectively), asealing disc77, aplug region79 and optionally a sealing member604 (not shown). The embodiment may be constructed of any of the previously described wire frames. Thesealing disc portion77 of the embodiment is adapted to cover a wide range of opening sizes while theplug region79 is adapted to conform to the anatomy into which it is inserted over its entire length.Sealing disc portion77 has minimal deformation under radial pressure changes or radial pressure exerted upon theplug region79. Sealingdisc77 and plugregion79 have substantial directional independence due to the flexibility of waist portion614: that is, the longitudinal axis of thefirst eyelet73 may be at significant offset with respect to the longitudinal axis of thesecond eyelet75.
• Anchor components or fixation devices may be attached to any of the embodiments. Examples of anchor complements (80 and96) are shown inFIGS. 26A and 30.FIG. 26A illustrates ananchor component80 with fixation elements configured to pierce, puncture or protrude into tissue adjacent to the device during or after deployment.Anchor component96 inFIG. 30 illustrates fixation elements configured with blunt ends designed to grasp or engage the adjacent tissue without substantially protruding into the tissue. Other anchor components may be envisioned including anchor components configured to possess both piercing and grasping capabilities. Such an anchor component may be similar to that shown inFIG. 30 but instead of having looped wire arm, have a single wire arm with a looped end the end of which may be crimped or positioned to either be in the same plane as the single wire arm or to protrude from the plane thereby being available to pierce or puncture tissue. Anchor components may be attached at any eyelet of the device. Anchor components may be configured to bend in any direction. Single or multiple anchor components may be affixed to any device or wire frame in any combination. Said anchors can be designed to release the tissue for repositioning and/or retrieval. Further, when the sealing device is in a delivery configuration, the barbs may be collapsed to avoid catching on the catheter components during retrieval of the device.
• FIG. 8 shows a perspective view of sealingdevice100 attached to a delivery system includingfirst tube102,third tube104, and a handle for deploying asealing device100.FIG. 8 further illustrates a firstlinear actuator802, a flushingport804, the secondlinear actuator806,lock release actuator808, ahousing810 and a slot with a length in thehousing812. Firstlinear actuator802 may have a variety of configurations which will be discussed further.
• FIGS. 9A-D are flow charts which describe the movements of the various components of the delivery system and attached sealingdevice100 during use.Loading sealing device100 into the delivery system prior to use is described inFIG. 9A. Components of the delivery system handle are shown inFIGS. 8,10 and11. A clinician may flush the delivery system by attaching a syringe or other suitable implement onto flushingport804 and filling the system with saline or any other appropriate flushing material. The firstlinear actuator802 may then be moved inslot812 inhousing810 against aspring1100.Spring1100 may be configured as shown or may be formed as a leaf spring, stepped spring or any form commonly known in the arts. This action rotates themandrel control lever1000, shown inFIG. 11, about aslider rod1102 to the side ofhousing810. This same motion moves the firstlinear actuator802 free ofdistal notch1104 in thesizing insert1103 and prevents thesecond tube108 from translating either proximally or distally. Sizinginsert1103 may be of any material with suitable mechanical properties.
• Typical handles, handle components, tools or catheters used to deliver medical devices can comprise commonly known materials such as Amorphous Commodity Thermoplastics that include Polymethyl Methacrylate (PMMA or Acrylic), Polystyrene (PS), Acrylonitrile Butadiene Styrene (ABS), Polyvinyl Chloride (PVC), Modified Polyethylene Terephthalate Glycol (PETG), Cellulose Acetate Butyrate (CAB); Semi-Crystalline Commodity Plastics that include Polyethylene (PE), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE or LLDPE), Polypropylene (PP), Polymethylpentene (PMP); Amorphous Engineering Thermoplastics that include Polycarbonate (PC), Polyphenylene Oxide (PPO), Modified Polyphenylene Oxide (Mod PPO), Polyphenelyne Ether (PPE), Modified Polyphenelyne Ether (Mod PPE), Thermoplastic Polyurethane (TPU); Semi-Crystalline Engineering Thermoplastics that include Polyamide (PA or Nylon), Polyoxymethylene (POM or Acetal), Polyethylene Terephthalate (PET, Thermoplastic Polyester), Polybutylene Terephthalate (PBT, Thermoplastic Polyester), Ultra High Molecular Weight Polyethylene (UHMW-PE); High Performance Thermoplastics that include Polyimide (PI, Imidized Plastic), Polyamide Imide (PAI, Imidized Plastic), Polybenzimidazole (PBI, Imidized Plastic); Amorphous High Performance Thermoplastics that include Polysulfone (PSU), Polyetherimide (PEI), Polyether Sulfone (PES), Polyaryl Sulfone (PAS); Semi-Crystalline High Performance Thermoplastics that include Polyphenylene Sulfide (PPS), Polyetheretherketone (PEEK); and Semi-Crystalline High Performance Thermoplastics, Fluoropolymers that include Fluorinated Ethylene Propylene (FEP), Ethylene Chlorotrifluroethylene (ECTFE), Ethylene, Ethylene Tetrafluoroethylene (ETFE), Polychlortrifluoroethylene (PCTFE), Polytetrafluoroethylene (PTFE), Polyvinylidene Fluoride (PVDF), Perfluoroalkoxy (PFA). Other commonly known medical grade materials include elastomeric organosilicon polymers, polyether block amide or thermoplastic copolyether (PEBAX) and metals such as stainless steel and nickel/titanium alloys.
• Adistal notch1104 andproximal notch1106 in sizinginsert1103 may be used to aid in the positioning of the firstlinear actuator802 inhousing slot812. The distance between the two notches,1104 and1106 respectively, may be the length of sealingdevice100 when it is elongated oversecond tube108 prior to loading onto the delivery system. Sizinginsert1103 may be sized to accommodate a variety of device lengths and is preferably from about 22.28 cm long with a distance between the proximal end ofdistal notch1104 and proximal end ofproximal notch1106 from about 6.25-13.32 cm.Notches1104 and1106 may be of any shape but are preferably rectangular.
• The firstlinear actuator802 is then moved to a mid point inslot812 toward the proximal end of thehousing810. This action causes thefirst tube102 to move proximally and thesealing device100 proximal end to move proximally, thus elongatingsealing device100. Firstlinear actuator802 may be any shape (lever, ball) but is preferably shaped to accommodate a clinician's thumb. Firstlinear actuator802 may be constructed of any material with suitable mechanical properties but is preferably a material similar to that of sizinginsert1103. A feature of the firstlinear actuator802 are recessed teeth formed in the top portion of the firstlinear actuator802 for securingretrieval cord110. This feature is preferred but optional. The teeth could be made into any tortuous path or have any shape desired to create resistance forretrieval cord110 during loading, deployment, or retrieval of sealingdevice100. Corresponding protruding teeth (not shown) may be formed in the bottom surface ofretrieval cord lock803. These teeth may fit together and hold the retrieval cord firmly. Other methods commonly known in the art for securing a small diameter cord may also be used and will be discussed in detail in a following section.
• The firstlinear actuator802 is then moved further proximally until the device is loaded inthird tube104. During this action,spring1100 pushes the firstlinear actuator802 and themandrel control lever1000 to the left ofslot812 and into theproximal notch1106 in sizinginsert1103. Thesecond tube108 is free to move proximally with sealingdevice100 andfirst tube102. As the firstlinear actuator802 is moved proximally, thesecond tube108, sealingdevice100 andfirst tube102 slide or translate into thethird tube104. After the firstlinear actuator802 is in its proximal most position, the system may again be flushed with saline in the manner described above.
• Alternate embodiments of firstlinear actuator802 are shown inFIGS. 12A-D.FIG. 12A shows a perspective view of the alternatelinear actuator1108 in the locked retrieval cord position.Linear actuator1108 is similar in construction tolinear actuator802 but features a retrievalcord locking ring1110 andretrieval cord groove1112.FIG. 12B depictsalternate embodiment1114, which is configured with athumb wheel1116 that extends beyond the sides of the linear actuator to facilitate easy manipulation.Thumb wheel1116 is screwed onto a threadedpost1118 around which the retrieval cord is wound.Embodiment1114 also contains aretrieval cord groove1120 through which the retrieval cord is guided prior to securing it around threadedpost1118.FIG. 12C illustrates yet anotherembodiment1122 that utilizes a side fitted threadedthumb wheel1124 around which the retrieval cord is wound and secured to theactuator1122 by the act of inserting the threadedpost1124 into a threaded aperture (not shown) in the side of theactuator1122. Prior to threading the retrieval cord around the threadedpost1124, the retrieval cord is inserted through theretrieval cord groove1126. Yet anotherembodiment1128 is shown inFIG. 12D.Embodiment1128 shows a linear actuator with moldedthumb wheel1130. Thethumb wheel1130 extends slightly beyond the edges of the linear actuator facilitating manipulation of the linear actuator. The retrieval cord is inserted throughcord groove1132 and wound around a threaded post (not shown). The moldedthumb wheel1130 is then secured on the threaded post securing the retrieval cord.
• Deploying sealingdevice100 into a defect is described inFIG. 9B. The firstlinear actuator802 is moved distally until a stop is reached. This movement causes thefirst tube102 andsecond tube108 to move distally within thethird tube104. Thelinear actuator802 must then be moved to the right inslot812, againstspring1100. When thelinear actuator802 is moved to the right,mandrel control lever1000 rotates onslider rod1102. This action causes thelinear actuator802 to be free of theproximal notch1106 in sizinginsert1103. After this action, thelinear actuator802 is further translated distally. This causes thefirst tube102 andproximal eyelet202 of sealingdevice100 to move distally. Also affected by this action is the distal end of sealingdevice100 which is prevented from moving. Thefirst tube102 guides the device out of thethird tube104 to deploy the device in a defect. Movinglinear actuator802 distally to the end ofslot812 results in the entire sealing device being deployed. One skilled in the art would recognize that the steps described above could be halted and reversed at certain points to allow optimal positioning of sealingdevice100.
• Locking the device is described in the flowchart illustrated inFIG. 9C. Theretrieval cord lock803 would be unsnapped from the firstlinear actuator802. A clinician would grasp the secondlinear actuator806 by gripping attachedlock release actuator808 and press it toward the middle ofhousing810. The secondlinear actuator806 may be of any size or shape but is preferably sized to fit within aslot1002 in the longitudinal surface ofhousing810.Linear actuator806 is fitted withlock release actuator808 by means of a snap fitting. Any means of attachment would suffice to fastenlock release actuator808 tolinear actuator806 such as glue or construction as a molded part. Materials appropriate for both the secondlinear actuator806 andlock release actuator808 may be any material of suitable mechanical properties but are preferably similar to that of the previously mentioned handle components.Lock release actuator808 is designed to enable a user to grip the device securely. Gripping may be aided by protrusions on the lateral sides of thelock release actuator808. These protrusions may be made of a similar material as that of thelock release actuator808 or may be made of a material with a high coefficient of friction or of a material more compliant than that oflock release actuator808. These protrusions may also be made with grating, a roughening, a raised design, or striations in the surface in conjunction with the material listed above to further aid in the gripping of the device. These features on the surface oflock release actuator808 may also be used to aid in gripping without the use of gripping protrusions and may be applied directly to the lateral surface of the secondlinear actuator806.Slot1002 may be configured to have a stop to hold the secondlinear actuator806 in a distal most position until lock release of the sealing device. A preferred stop is shown inFIGS. 10 and 11 in the form of a corrugated area but may also be any manner of mechanical stop.Slot1002 may be of any length but preferably has a length sufficient to translate motion proximally about the width of the secondlinear actuator806 plus about 3.18 cm.Slot1002 may be any shape that would accommodate the secondlinear actuator806.
• An alternate embodiment of secondlinear actuator806 is shown inFIGS. 13A and 13B. Instead of grippinglock release actuator808 and activating second linear actuator806 a rotatablelock release actuator1300 is gripped and rotated to affect lock release. The rotatablelock release actuator1300 may contain awindow1302 which would prevent forward movement of the firstlinear actuator802. When rotated,lock release actuator1300 allows the same actions aslock release actuator806 shown inFIG. 10.
• Once the secondlinear actuator808 is gripped, a clinician may move the secondlinear actuator806 proximally. This action results in proximal movement ofthird tube104,mandrel control lever1000, sizinginsert1103 andsecond tube108.Second tube108 moves proximally from between eyelets of the device. An alternate method of achieving this action would be to provide a twist mechanism to the distal end of the handle instead of a secondlinear actuator806. This twist mechanism would be provided with a slot that allows for the same movement of thethird tube104,mandrel control lever1000, sizinginsert1103 andsecond tube108 as the secondlinear actuator806.
• Once lock release has been achieved, theretrieval cord lock803 is then twisted to remove it from the firstlinear actuator802 and pulled until theretrieval cord110 is free of the delivery system.Retrieval cord110 is attached to theretrieval cord lock803 at one end.Retrieval cord110 may be constructed of any material with suitable mechanical properties such as Kevlar®, flexible metal wire, polymers and the like. A preferably material forretrieval cord110 is an ePTFE fiber.Retrieval cord lock803 may be configured in a variety of shapes and sizes. Possible retrieval cord locks may be designed to provide a slot in thelinear actuator802 through which the retrieval passes. In one configuration, the retrieval cord is secured by passing the cord through a slot or hole in the axis of the thumb wheel disposed in thelinear actuator802 and tightened by twisting the thumb wheel. An alternate configuration would provide a slide lock that binds the retrieval cord between the lock and thelinear actuator802 using friction. A preferred design would be to secure the retrieval cord between teeth formed in the retrieval cord lock as shown inFIG. 11.
• Materials suitable for constructingretrieval cord lock803 are similar to that used to constructhousing810 and other handle components. As mentioned previously,retrieval cord lock803 preferably has teeth or protrusions that correspond to indentations inlinear actuator802 for the purpose of grippingretrieval cord110.Retrieval cord lock803 may be configured in a variety of shapes to enableretrieval cord110 to be secured. A preferred configuration would include apertures through theretrieval cord lock803 to allowretrieval cord110 to be threaded therethrough and knotted. After twisting theretrieval cord lock803, it is pulled until theretrieval cord110 is removed from the delivery system.
• Prior to the step four described inFIG. 9C, thesealing device100 may be retrieved as described in the flowchart illustrated inFIG. 9D. Theretrieval cord lock803 may be snapped into the firstlinear actuator802. This serves to lock theretrieval cord110 in place. The clinician then moves the firstlinear actuator802 to the right edge ofslot812. The firstlinear actuator802 moves inslot812 to the right pressing onspring1100 while themandrel control lever1000 rotates on theslider rod1102 to the right of the handle.Slider rod1102 is preferably of a round cross-section but one skilled in the art would recognize that a variety of cross-sectional shapes (e.g. square or triangular) would be acceptable.Slider rod1102 could also be configured in the shape of acrown spring1400 as shown inFIGS. 14A and B. The spring could be inserted in aslot1402 through the linear actuator to allow fore and aft translation of the linear actuator. An alternate embodiment ofspring1100 may be a spring molded as anintegral part1500 of firstlinear actuator802 as illustrated byFIG. 15. Another embodiment ofspring1100 is shown inFIG. 16. In this configuration, aspring1600 is attached tohousing810 and pushes on the firstlinear actuator802 in key positions. As stated above, one skilled in the art would recognize the appropriate materials for use as a spring or molded part. The firstlinear actuator802 is free ofdistal notch1104 and thesecond tube108 is prevented from moving. The first linear actuator is moved proximally by the clinician causingfirst tube102 to move proximally. This motion translates the proximal end of sealingdevice100 proximally elongating thedevice100 and allowing it to be pulled into thethird tube104.
EXAMPLES
• Without intending to limit the scope of the invention, the following examples illustrate how various embodiments of the invention may be made and/or used.
Example 1
• A sealing device similar toFIG. 1 was manufactured using the following components and assembly process.
• An expanded polytetrafluoroethylene material was obtained with the following properties:
• Methanol bubble point of 1 psi
• Mass/area of 2.2 grams/square meter
• Longitudinal maximum load of 1.6 kg/inch
• Thickness of 0.0003 inch
• Longitudinal matrix tensile strength of 92000 psi
• The following test methods and equipment were used to determine the above-mentioned properties: Methanol bubble point was measured using a custom built machine with a 1 inch diameter foot, a ramp rate of 0.2 psi/second and a liquid media of methanol. Length and width of the material were measured using a metal ruler. Mass/area was measured using a balance (Model GF-400 Top Loader Balance, ANG, San Jose Calif.) with a 36×5 inch sample. Longitudinal maximum load was measured using a materials test machine (Model 5564, Instron, Grove City, Pa.) equipped with a 10 kg load cell. The gauge length was 1 inch and the cross head speed was 25 mm/minute. Sample width was 1 inch. Longitudinal tensile test measurements were taken in the length direction of the material. Thickness was measured using a thickness gauge (Mitutoyo Digital Indicator 547-400) with a foot diameter of ¼ inch. The longitudinal matrix tensile strengths (MTS) were calculated using the following equation: Density was calculated using the formula, density=mass/volume.
• $\mathrm{Matrix}\mathrm{Tensile}\mathrm{Strength}=\frac{\left({\sigma }_{\mathrm{sample}}\right)*\left({\rho }_{\mathrm{PTFE}}\right)}{\left({\rho }_{\mathrm{sample}}\right)}$
• An expanded polytetrafluoroethylene with a thin layer of FEP (fluorinated ethylene propylene) material was obtained with the following properties:
• Mass/area of 36.1 grams/square meter
• Maximum Load, Longitudinal of 12.6 kg/inch
• Maximum Load, Transverse of 0.3 kg/inch
• Thickness of 0.0012 inch
• The following test methods and equipment were used to determine the above-mentioned properties: Material was weighed using a precision analytical balance (Model GF-400 Top Loader Balance, ANG, San Jose Calif.) with a sample area of 36×1 inch sample. Length and width of the material were measured using a metal ruler. Material thickness was measured using a digital thickness gauge (Mitutoyo Digital Indicator 547-400) with a foot diameter of ¼ inch. Maximum transverse load was measured using a materials test machine (Model 5564, Instron, Grove City, Pa.) equipped with a 10 kg load cell. The sample width was 1 inch, the gauge length was 1 inch and the cross head speed was 25 mm/minute. Maximum longitudinal load was measured using a materials test machine (Model 5564, Instron, Grove City, Pa.) equipped with a 200 kg load cell. The sample width was 1 inch, the gauge length was 1 inch and the cross head speed was 25 mm/minute. Longitudinal tensile test measurements were taken in the length direction of the material and transverse tensile test measurements were taken in the direction orthogonal to the length direction.
• A distal eyelet was formed by first obtaining a length of 10% platinum drawn filled nitinol wire (Fort Wayne Metals, Fort Wayne, Ind.) with a diameter of about 0.23 mm. This wire was labeled “first wire”. A free end of the first wire was doubled on itself to create an open-ended loop and the open-ended loop was inserted into the button. The button was then inserted onto the keyed center pin. The button was shaped to have an opening through the center to accommodate the keyed center pin and to have features that allow it to rest securely in the winding jig. The keyed center pin (major axis of about 0.51 mm and minor axis of about 0.25 mm and length of about 10.16 mm) was then inserted in the center of a winding jig. The keyed center pin was fabricated from high strength steel (Super Cobalt HSS Tool Bit, MSC#56424278, Seco Fagersta). The steel was tempered per manufacture's instructions at 1475° F. for one hour. The winding jig and button were fabricated in house from corrosion resistant tool steel.
• A second length of the same type of drawn filled nitinol wire was obtained and labeled “fifth wire”. The first, fifth and an additional three wires were tensioned by attaching weights to the wire ends. The first wire and the fifth wire were then wound around the free end of the first wire one full revolution. The three additional wires were introduced to the winding jig and all five wires were wound around the free end of the first wire to a height of about 1.98 mm.
• A distal disk was then formed by separating the five wires and securing them in radial grooves around the circumferential edge of the winding jig. A radius was formed with the dimensions of 15 mm. Each wire formed one petal of the distal disk. The radius on the curvature of the petals was maximized in order to minimize sharp bend angles in the wire.
• A center eyelet was formed by grouping the wires together and winding them around the free end of the first wire and the keyed center pin to a height of about 1.98 mm. The wires were then separated and secured in radial grooves around the circumferential edge of the winding jib creating a proximal disk with a radius of 15 mm.
• A proximal eyelet was formed by again grouping the five wires and winding them around the free end of the first wire and the keyed center pin to a height of about 1.98 mm. The five wires were then separated and secured by placing a stainless steel plate on top of the wires and locking down the plate with screws. The free end of the first wire was then wound one revolution around a stainless steel pin with a diameter of about 3.18 mm and secured similarly to the other five wires.
• The jig with sealing device was then removed from the stabilizing fixture and placed in an oven (BlueM SPX Electric Forced Air Convection Oven) and the wires were thermally shape set as commonly known in the arts. The device and jig were then water quenched. The secured wires were released from the securing plate and the device was chilled and removed from the jig and keyed center pin. The device was then placed on a piece of flattened PEEK (polyetherether ketone) and trimmed by hand to the outer diameter of the distal eyelet. The lock loop was trimmed by hand to a point just beyond one complete revolution and pulled through the proximal and center eyelets.
• The device was pushed from the PEEK mandrel onto a keyed stainless steel process mandrel with an oval cross section. The mandrel was produced from flattened stainless steel wire (Ft. Wayne Metals, Fort Wayne, Ind.) with an oval cross-section to have a 45° clockwise twist between the proximal eyelet and the center eyelet and a second 45° clockwise twist between the center eyelet and the distal eyelet.
• The process mandrel and device were then placed in a stabilizing fixture which was placed in a FEP powder coating machine (C-30, Electrostatic Technology, Inc., Bradford, Conn.) and processed until coated completely. Excess FEP powder was removed from the device. The FEP was vacuumed from the lock loop, process mandrel and bumper. The process mandrel and device were removed from the stabilizing fixture, placed into an oven and baked to set the FEP coating as commonly known in the arts.
• A hollow core film mandrel (35.99 mm O.D. 76.2 cm long stainless steel) was obtained. Expanded polytetrafluoroethylene material with a slit width of 22.22 mm was obtained and loaded onto a spiral wrapping machine. The machine was manufactured in house to wrap PTFE (polytetrafluoroethylene) material at any desired angle, tension and rate. The mandrel was loaded onto the wrapping machine and the material was wrapped three times around the circumference of the hollow core mandrel. The material was then wrapped around the mandrel at an angle of about 8° for the length of the mandrel. The direction of wrapping was reversed and the material over wrapped at the same angle. The third and fourth layers were wrapped in the same manner with the seams offset. The mandrel was removed from the wrapping machine, inserted in an oven and baked at 370° C. for 45 minutes. The wrapped mandrel was removed from the oven and allowed to cool to room temperature. The resulting PTFE tube was removed from the mandrel.
• The PTFE tube was then cut to about 140 mm and hand stretched to a desired length 155 mm. The PTFE tube was then pulled over the frame. The PTFE tube was then crimped onto the center eyelet and then crimped onto the distal and proximal eyelets.
• An expanded polytetrafluoroethylene with a thin layer of FEP (fluorinated ethylene propylene) material was then wrapped four times around the eyelets starting with the center eyelet. The wrapped eyelets were tacked into place a soldering iron. The PTFE tube was then heat set for 3 minutes at 320° C. and trimmed to the outer most points of the proximal and distal eyelets. The device was removed from the mandrel.
Example 2
• A sealing device similar toFIG. 6 was manufactured using the following components and assembly process.
• Expanded polytetrafluoroethylene and expanded polytetrafluoroethylene with a thin layer of FEP (fluorinated ethylene propylene) materials similar to that described in Example 1 were obtained.
• A distal eyelet was formed by first obtaining a length of 10% platinum drawn filled nitinol wire (Fort Wayne Metals, Fort Wayne, Ind.) with a diameter of about 0.23 mm. This wire was labeled “first wire”. A free end of the first wire was doubled on itself to create an open-ended loop and the open-ended loop was inserted into the button. The button was then inserted onto the keyed center pin. The button was shaped to have an opening through the center to accommodate the keyed center pin and to have features that allow it to rest securely in the winding jig. The keyed center pin (major axis of about 5.79 mm and minor axis of about 0.25 mm and length of about 10.16 mm) was inserted in the center of a winding jig. The keyed center pin was fabricated from high strength steel (Super Cobalt HSS Tool Bit, MSC#56424278, Seco Fagersta). The winding jig and button were fabricated in house from corrosion resistant tool steel.
• A second length of the same type of drawn filled nitinol wire was obtained and labeled “fifth wire”. The first, fifth and an additional three wires were tensioned by attaching weights to the wire ends. The first wire and the fifth wire were then wound around the free end of the first wire one full revolution. The three additional wires were introduced to the winding jig and all five wires were wound around the free end of the first wire to a height of about 1.98 mm.
• A device was then formed by separating the five wires and securing them in radial grooves around the circumferential edge of the winding jig. A radius was formed with the dimensions of 15 mm. Each wire made an entire revolution around the winding jig.
• A proximal eyelet was formed by grouping the five wires and winding them around the free end of the first wire and the keyed center pin to a height of about 1.981 mm. The five wires were then separated and secured by placing a stainless steel plate on top of the wires and locking down the plate with screws. The free end of the first wire was then wound one revolution around a stainless steel pin with a diameter of about 3.18 mm and secured similarly to the other five wires.
• The jig with sealing device was removed from the stabilizing fixture and placed in an oven (Blue M SPX Electric Forced Air Convection Oven) where the wires were partially thermally shape set as commonly known in the arts. The device and jig were then water quenched. The secured wires were released from the securing plate and then the device was chilled and removed from the jig and keyed center pin. The lock loop was trimmed by hand to a point just beyond one complete revolution and pulled through the proximal and center eyelets.
• The device was pushed from the PEEK mandrel onto a keyed stainless steel transfer mandrel with an oval cross section. The mandrel was produced from flattened stainless steel wire (Ft. Wayne Metals, Fort Wayne, Ind.) with an oval cross-section. The device was then partially removed from one end of the transfer mandrel. The removed device end was twisted approximately 180° clockwise and repositioned on the transfer mandrel. The device and transfer mandrel were placed in an oven (Blue M SPX Electric Forced Air Convection Oven) where the wires were thermally shape set as commonly known in the arts.
• The transfer mandrel and device were then placed in a stabilizing fixture which was placed in a FEP powder coating machine (C-30, Electrostatic Technology, Inc., Bradford, Conn.) and processed until coated completely. Excess FEP powder was removed. FEP powder was vacuumed from the lock loop, process mandrel and bumper. The transfer mandrel and device were then removed from the stabilizing fixture, placed into an oven and baked to set the FEP coating as commonly known in the arts.
• A hollow core film mandrel (35.99 mm O.D. 76.2 cm long stainless steel) was obtained. An ePTFE material with a slit width of 22.24 mm was obtained and loaded onto a spiral wrapping machine. The machine was manufactured in house to wrap ePTFE film at any desired angle, tension and rate. The mandrel was loaded onto the wrapping machine and the film was wrapped three times around the circumference of the hollow core mandrel. The ePTFE material was then wrapped around the mandrel at an angle of about 8° for the length of the mandrel. The direction of wrapping was reversed and the material over wrapped at the same angle. The third and fourth layers were wrapped in the same manner with the seams offset. The mandrel was removed from the wrapping machine, inserted in an oven and baked at 370° C. for 45 minutes. The wrapped mandrel was removed from the oven and allowed to cool to room temperature. The resulting ePTFE tube was removed from the mandrel.
• The ePTFE tube was then cut to about 140 mm and hand stretched to a desired length 155 mm. The ePTFE tube was then pulled over the frame. The ePTFE tube was then crimped onto the distal and proximal eyelets. An ePTFE with a thin layer of FEP (fluorinated ethylene propylene) material was then wrapped four times around the eyelets. The wrapped eyelets were tacked into place a soldering iron. The ePTFE tube was then heat set for 3 minutes at 320° C. and trimmed to the outer most points of the proximal and distal eyelets. The device was then removed from the mandrel.
Example 3
• An handle assembly similar toFIG. 8 was manufactured using the following components and assembly process.
• Components for the handle assembly were fabricated using an injection molding process. The parts were fabricated by Contour Plastics (Baldwin, Wis.) using Lustran® 348. This material was suitable for use in medical devices and has an advertised tensile strength of 48.2 MPa and a tensile modulus of 2.62 GPa. Nine parts were fabricated using this injection process and Lustran® 348. The parts included the second linear actuator, flushing gasket retainer, a first linear actuator, retrieval cord lock, mandrel control lever, left body housing, sizing insert, right body housing, and a lock release actuator.
• Other materials required for the assembly of the handle were purchased items. A catheter tube formed with a layup process commonly known in the arts was ordered (Teleflex Medical, Jaffrey, N.H.) with an I.D. of 0.048 mm and an O.D. of 0.33 mm and a platinum iridium marker band placed near the end of the distal tip. The main body of the catheter tube was Pebax® 7233 tube with PTFE liner and stainless steel braid (65 PPI) and the distal most 20.32 mm of the catheter tube was comprised of 6333 Pebax® (0.027 mm I.D. and an 0.033 mm O.D.) and a curve in the distal end (39.98 mm radius). A guidewire port formed by a laser was placed in the catheter tube proximal of the marker band. A flushing gasket or u-cup type gasket made of silicone (22.99 mm depth, I.D. tapered from 2.89 mm to 1.85 mm I.D. tapered from 6.71 mm to 7.75 mm) was procured from Apple Rubber of Lancaster, N.Y. A flushing port (Merit Medical, South Jordan, Utah) having an about six inch flexible pvc (polyvinyl chloride) tube with a 3.18 mm O.D. female luer connector was obtained. A quick set cyanoacrylate adhesive was supplied from in-house stock. Stainless steel hypotubes were ordered from Small Parts, Inc. (1.45 mm O.D., 1.30 mm I.D., length of 30.48 cm.). Slider rods (PTFE coated stainless steel hypotubes, 3.18 mm O.D., 1.65 mm I.D., length of 33.02 cm) were procured from Applied Plastics. Control springs (PTFE-coated stainless steel leaf springs, thickness 0.10 mm, minor flange length 5.33 mm, major flange length 10.11 mm, overall length 15.88 mm) were ordered from Incodema of Ithaca, N.Y.
• The remainder of the components were supplied from in house stock or manufactured in house. All triple lumen tubes were manufactured of Pebax® 7233 with 20% barium sulfate. Both triple lumen tubes had an O.D. (outer diameter) of 0.25 mm. One triple lumen tube had round lumens with two I.D.s (inner diameters) of 0.035 mm and one I.D. of 0.15 mm. One triple lumen tube had one lumen with an oval cross-section with two I.D.s of 0.036 mm and one I.D of 0.127×0.07 mm. Stainless steel PTFE coated (polytetrafluoroethylene) process mandrels were manufactured in house. One process mandrel had a cross-sectional shape that transitioned from round (O.D. of 0.16 mm) to oval (O.D. of 0.14×0.07 mm). PTFE covered stainless steel wire was procured from in house stock (O.D. 0.03 mm). Standard luer fittings were obtained from in house stock. A PEEK (polyetheretherketone) second tube extrusion was obtained from in house stock with an oval cross-section of 1.27×0.69 mm O.D.
• A first tube was made in the following manner. One triple lumen extruded tube with round lumens was obtained. Another triple lumen extruded tube was obtained with one lumen having an oval cross-section. A stainless steel processing mandrel was also obtained having a cross-sectional shape, which transitions from round (O.D. of 1.52 mm), to oval (O.D. of 1.39×0.81 mm). Both extruded tubes were loaded onto the mandrel with the mandrel being inserted through the larger lumen on both tubes. Two small PTFE covered stainless steel wires were inserted through the smaller lumens of both extruded tubes. The mandrel and tubes were inserted into a RF (radio frequency) die (2.51 mm I.D., 4.45 mm length, fabricated from D2 tool steel). The junction of the two catheters was positioned in the center of the RF die. The RF die and mandrel was placed in the middle of an RF coil on an RF welding machine (Hot Shot I, Ameritherm Inc., Scottsville, N.Y.) and welded as commonly known in the art. When the components had reflowed, pressure was applied to each end of the extruded tubes to meld the junction of the tubes. The die was then sprayed with compressed air to cool the die and to set the Pebax®. The extruded tube and die were removed from the RF machine and the extruded tube was removed from the die. The process mandrel and wires were removed from the lumens of the extruded tube.
• A lubricious coating may be applied to the second tube. A silicone mold release spray (Nix Stix X-9032A, Dwight Products, Inc., Lyndhurst N.J.) may be sprayed onto about the distal 30 cm of the second tube and allowed to dry at ambient temperature under a fume hood.
• A third tube sub-assembly was made in the following manner. A catheter tube was bisected with a straight razor at approximately 6.35 cm from the proximal end of the catheter tube. A male and female in-line luer connector (Qosina, Edgewood, N.Y.) was obtained and drilled to an I.D. of 3.45 mm. U.V. (ultra-violet) cured adhesive (Loctite 3041) was applied to the bisected ends of the catheter tube and the drilled luer fittings were attached. The adhesive was cured per manufacture's instructions and the luer fittings were screwed together.
• The second linear actuator sub-assembly was made in the following manner. The second linear actuator, flushing port, flushing gasket retainer and silicone flushing gasket were obtained. The flushing gasket was inserted into the back of the second linear actuator with the u portion of the flushing gasket facing distally. The flushing gasket retainer was fitted over the top inside the second linear actuator. Cyanoacrylate glue was applied around the gasket retainer to hold the gasket retainer in place. The flushing port was placed into an aperture in the second linear actuator and an U.V. cure adhesive was applied and cured according to manufactures instructions.
• A first tube was obtained and cyanoacrylate was applied to the outside surface of the round I.D. section of the catheter in a 2.54 cm band from the end. The catheter was then inserted into the distal end of the control shuttle until the catheter became flush with the back of the control shuttle. The catheter was oriented so that the two small lumens were horizontal and on the top portion of the round lumen. The retrieval cord lock was snapped onto the control shuttle.
• The second tube sub-assembly was manufactured in the following manner. A four inch piece of 0.033 mm diameter nitinol wire was inserted into the second tube extrusion. The second tube extrusion with wire insert was inserted into a hypotube. The distal end of the hypotube was crimped by hand three times.
• The distal end of the first tube was threaded through the top of the mandrel control lever and through the top aperture on the distal end of the mandrel control lever. The distal end of the second tube was threaded into the proximal end of the control catheter. The second tube was pushed into the first tube until about 4 in. of hypotube were protruding from the end of the control catheter. A cyanoacrylate adhesive was applied to the proximal end of the hypotube over about a 12.7 mm section. This section was inserted into the top aperture in the proximal end of the mandrel control lever until flush with the back of the mandrel control lever. The distal end of the first tube was then threaded into the proximal end of the second linear actuator. The second linear actuator was moved to the back most position on the control catheter.
• A sizing insert was then fitted into a left body shell. The sizing insert was oriented so that the groove in the sizing insert fit over the ridge in the left shell. The catheter sub assembly was placed into the left body shell so that the mandrel control lever fit into the sizing insert and the second linear actuator fit into the slot in the distal end of the left body shell. A slider rod was inserted through the openings in the sizing insert, mandrel control lever, control shuttle and the second linear actuator. The slider rod was made to rest on two supports in the left body shell. The control spring was inserted into the right body shell so that it fit into the opposing teeth. The right body shell was then placed onto the left body shell and the two were snapped together. Two screws (#4-24×½ in. thread-forming Pan Head) were inserted into the available apertures on the left body shell and tightened. The lock release actuator was snapped into place on the right tab of the second linear actuator with a drop of cyanoacrylate adhesive to ensure that it remained attached.
• The second linear actuator, control shuttle, and the mandrel control lever were moved to their forward most positions. The second linear actuator was pulled back and then returned to its forward position. The distal end of the first tube was trimmed by hand with a razor blade to 1.27 mm measured from the tip of the third tube. The sizing insert was pushed forward. The second tube was trimmed by hand using a razor blade to a length of about 0.76 mm measured from the distal most end of the control catheter. An about 4 inch long piece of nitinol wire (0.30 mm diameter) was obtained. A cyanoacrylate adhesive was applied into the tip of the second tube with an elongated applicator tip. The nitinol wire was inserted into the tip of the locking and another piece of wire was used to insert the nitinol wire about 2 mm into the second tube. The cyanoacrylate adhesive was allowed to cure.
• The second linear actuator was pulled back and a slot was punched out of the control catheter. The slot had a width that was about the same width as the small axis of the oval lumen of the catheter. A razor was used to skive the slot to a final length of about 19.05 mm. The second linear actuator and the sizing insert were then moved to a forward position.
• A retrieval cord approximately 3.05 m long (PTFE fiber with a 0.25 mm O.D.) and a 1.52 m (0.15 mm O.D.) nitinol wire were obtained. The nitinol wire was inserted into one of the 0.04 mm lumens in the first tube and pushed through until it came out into the handle. Tweezers were used to grasp the wire and pull it out of the slot in the handle. About 76.2 mm of wire were made to protrude from the distal end of the control catheter. A loop was formed in the wire by inserting the loose end into the same lumen at the distal end of the control catheter. About 76.2 mm of retrieval cord was then threaded through the resulting loop. The nitinol wire was pulled through the catheter until the retrieval cord protruded into the handle.
• A sealing device was obtained. A needle of a type commonly used for sewing was threaded with the retrieval cord and the needle was inserted through the PTFE bag opposite the lock loop and through the lumen of the proximal eyelet of the sealing device. The nitinol wire was then threaded through the remaining unoccupied 0.04 mm lumen in the first tube with the loop end of the wire pointing distally. The needle was removed from the retrieval cord and the cord was threaded through the loop on the nitinol wire. The retrieval cord was then pulled through the catheter in the manner described previously.
• The control shuttle was retracted approximately 12.7 mm. The second tube was then threaded through the eyelets of the device. Tweezers were used to grasp the retrieval cord and pull in to the outside of the handle. A loop was formed in a portion of small diameter nitinol wire. The loop was inserted through an aperture in the distal portion of the top of the control shuttle. The retrieval cord was threaded through this loop and pulled through the aperture in the distal portion of the control shuttle. The retrieval cord lock was removed from the control shuttle and one free end of the retrieval cord was inserted through the aperture in the retrieval cord lock from the bottom. Four over hand knots were tied in the cord. Excess cord was trimmed by hand and the retrieval cord lock was returned to the control shuttle.
• The remaining free retrieval cord was pulled until all slack was gone. The remaining free end of the retrieval cord was inserted into an aperture in the front of the top of the control shuttle. The retrieval cord was pulled until taught and the retrieval cord lock was snapped dosed. The cord was trimmed by hand to about 20.32 cm.
• The second tube was flared by obtaining a soldering iron with a sharp tip and heating it to about 500° F. The tip of the iron was inserted into the second tube until a flare was created that was approximately 1.39 mm in diameter. The locking loop on the device was chilled.
Example 4Tear Drop
• A length of 0.23 mm diameter nitinol wire (Fort Wayne Metals, Fort Wayne, Ind.) was obtained. The specific length of the wire was not measured, it is only necessary that the wire be long enough to double through the feed holes described in the following paragraph. The wire was obtained having been electro polished.
• Abase jig8 as described inFIG. 17 was obtained. The base jig was secured in a chuck of a lathe andcenter pin22 was inserted intocenter pin hole24 far enough to securely seat it. A knot was tied into one end of one length of a length of nitinol wire and the unknotted end was fed through a wire feed hole10. Two additional lengths of nitinol wire were folded in half and the free ends were fed through the remaining fourfeed holes12,14,16,18.Weights20 were attached to the free ends of the five wires to hold the wires taut and in place.
• The other end ofcenter pin22 was located inside thecenter hole28 oftail stock support26 which was chucked into the tail stock, wherein theclosed face30 of thetail stock support26 faced thebase jig8. Thebase jig8 andtail stock support26 were positioned about 5 cm apart. Awire guide34 was used to prevent the wires from crossing. Thebase jig8 was positioned so that the wire feed holes10,12,14,16,18 were oriented vertically above thecenter pin22 and the wires were positioned on the trailing side of thecenter pin22. The wires were wrapped twice around thecenter pin22 and left to hang parallel to the wire feed holes.
• Thepetal jig hole36 was rotated 720°. Thepetal jig38 was inserted into thepetal jig hole36. Without crossing the wires, the wires were wrapped counter clockwise around thepetal jig38 past thetear drop pin39 and around the circumference of thetear drop pin39. The wires were wrapped around the outer circumference of thepetal jig38 to bring the wire between thepetal jig38 and thecenter pin22. They were then wrapped around thecenter pin22 twice.
• The wires were placed underanchor plate11. Theanchor plate11 was secured with Allen head screws14. The wires were cut on theweight20 side of theanchor plate11.
• With theweights20, thetail stock support26, and thewire guide34 removed, the assembly was placed in a convection oven set to 475° C. for 14 minutes. The assembly was removed from the oven and quenched in water. The jigs were disassembled and the article was removed.
• The wire ends were trimmed to the eyelets and the petals were fanned in the same direction as the helical winding, such that each petal was oriented 72° relative to the adjacent petal.
• The article was powder coated with FEP powder (obtained from in house stock) in the following manner. A 2 mm outer diameter steel hollow mandrel was obtained of sufficient length to hold the article and have remaining length to extend into the commercial blender. The mandrel was inserted into the center hole of the article. One end the mandrel was grounded. A commercial blender (Variable Speed Lab Blender, Waring, Torrington, Conn.) was obtained and a quantity of FEP powder was added, leaving the tip of the blender blades exposed. The article and mandrel were suspended in the center of the blender, the lid was replaced, and the blender was turned on to the highest setting for about 5 seconds. The article and mandrel were removed, the mandrel was tapped to achieve a more uniform powder coating, the powder coating was vacuumed from the madrel and the article and mandrel were then hung inside a convection oven set to 320° C. for 3 minutes. The article and mandrel were removed from the oven, allowed to cool, and excess FEP was removed from the article, the mandrel was removed.
• In a separate process a lock loop43 (illustrated inFIG. 18A) was manufactured. Thelock loop43 was inserted through a hypotube45 (smaller than the ID of the eyelets) with the loopedend47 of thelock loop43 straightened. Thehypotube45 was inserted through the eyelets from the distal end untillock loop eyelet49 is situated over thedistal eyelet608 of the device. The hypotube was removed.
• A crimped mandrel41 (shown inFIGS. 18B and 18C) was inserted into the article through the eyelets with thelock loop43 along the outer length of themandrel41. The article was extended in length on the mandrel by grasping the proximal and center eyelets with tweezers. The eyelets were fixed in place by positioning them beyond the crimps in the mandrel.
• Next, a porous ePTFE film having the following properties was obtained:
• Methanol bubble point of 0.7 psi
• Mass/area of 2.43 grams/square meter
• Longitudinal matrix tensile strength of 96000 psi
• Matrix tensile strength in the orthogonal direction of 1433 psi
• Longitudinal maximum load of 1.6 kg/inch
• Thickness of 0.00889 mm
• Methanol bubble point is measured using a custom built machine with a 1 inch diameter foot, a ramp rate of 0.2 psi/second and a liquid media of methanol. Length and width of the material are measured using a metal ruler. Mass/area is measured using a balance (Model GF-400 Top Loader Balance, ANG, San Jose Calif.) with a 36×5 inch sample. Longitudinal maximum load is measured using a materials test machine (Model 5564, Instron, Grove City, Pa.) equipped with a 10 kg load cell. The gauge length is 2.54 cm and the cross head speed is 25 mm/minute. Sample width is 2.54 cm. Longitudinal tensile test measurements are taken in the length direction of the material. Thickness is measured using a thickness gauge (Mitutoyo Digital Indicator 547-400) with a foot diameter of ¼ inch. The longitudinal matrix tensile strengths (MTS) are calculated using the following equation: Density is calculated using the formula, density=mass/volume as described in a previous example.
• A 30 mm film tube is constructed from the ePTFE material in the following manner. For a 25 mm diameter device, a film with a slit width of about 1.905 cm is wound on a 30 mm OD mandrel. The amount of film overlap is not critical but no overlap of the edges is unacceptable. The film tube is then removed from the mandrel and stretched to make the ID of the tube to be about 25 mm. The film tube was slipped over the tensioned article and using ePTFE film, the ends of the tube were cinched around the center of the device then the eyelets.
• Another porous ePTFE film, having a layer of FEP, was obtained having the following properties:
• Mass/area of 36.1 grams/square meter
• Maximum Load, Longitudinal of 12.6 kg/inch
• Maximum Load, Transverse of 0.3 kg/inch
• Thickness of 0.030 mm
• Test methods for the above tests are described previously. The FEP thickness in the film is about 62.5%. FEP thickness (%) is calculated as ratio of the FEP thickness and the film thickness. The reported value represents the average measurements for five samples. FEP thickness and film thickness is measured from scanning electron microscope images of cross sections of the ePTFE/FEP laminate material in the following manner. The magnification is chosen to enable the viewing of the entire film thickness. Five lines perpendicular to the horizontal edge of the image are randomly drawn across the full thickness of the film. Thickness is determined by measuring the thickness of the FEP and the thickness of the film.
• A 2 mm wide strip of this FEP-coated ePTFE film, with the FEP side down, was wrapped four times around the cinched portions and heated with a soldering iron to bond the film layers together.
• The article and mandrel were placed inside a convection oven set to 320° C. for 3 minutes and then removed and allowed to cool. The excess ePTFE material was trimmed and the article removed from the mandrel.
Example 5Long 5 Wire
• An article was constructed in the same manner as example 1 with the following exceptions:
• Instead of usingpetal jig38, self centering petal jig39 (FIG. 19) was used whereinjig39 was placed over thecenter pin22 andtail stock support26 was introduced prior to wrapping the first eyelet. After wrapping the first eyelet self centeringpetal jig39 was inserted intopetal jig hole36. The wire was wrapped around the perimeter ofpetal jig39 to form petals and wrapping was continued aroundcenter pin22 to create a second eyelet. A fully extended final article of this example is shown inFIGS. 20A and B.
Example 6Long 10 Wire
• An additional article32 shown inFIG. 21 was constructed using two intermediate (i.e., not powder coated) articles (one inner and one outer) of example 5 wherein, the intermediate articles were wrapped in opposite directions. Additionally the inner intermediate article was manufactured such that the eyelets of the inner intermediate article would fit within the eyelets of the outer intermediate article. Prior to FEP coat, the inner and outer intermediate articles were nested using the following method:
• In order to achieve nesting of the two intermediate articles, the distal eyelets and the proximal eyelets must be nested. Inner intermediate article was positioned at the end of a straight, circular mandrel. One eyelet of the outer intermediate article was positioned over an eyelet of the inner intermediate article and both intermediate articles were repositioned to the other end of the mandrel. The remaining eyelet of the outer intermediate article was positioned over the remaining eyelet of the inner intermediate article. They were arranged such that the overlapping wires were equally spaced (about 72° apart) thereby creating a frame. The frame was subsequently FEP coated and covered with an ePTFE bag in order to create the final article.
Example 7Short 6 Wire
• With the following exceptions, an article similar to that as described in example 1 was created: Asimilar jig50 illustrated inFIG. 22B as previously described in example 1 was obtained. The petal jigs52 andwaist jig54 were positioned as shown inFIG. 22B. The wire wrapping process is shown in thewire path56 depicted inFIG. 22B, wherein the wire starts at anchor points57 and ends at eyelet pin58 (not shown) that is inserted intoeyelet pin hole59. The wire is wrapped 720° around the eyelet pin at the start of the device wrapping and at the finish of the device wrapping. The fully extendedfinal article51 of this example is shown inFIG. 22A.
Example 8Short 12 Wire
• An additional article (FIGS. 23A and 23B) was constructed using two intermediate (i.e., not powder coated) articles (one inner and one outer) of example 7 wherein, the intermediate articles were wrapped in opposite directions. Additionally the inner intermediate article was manufactured such that the eyelets of the inner intermediate article would fit within the eyelets of the outer intermediate article.
• Prior to FEP coat, the inner and outer intermediate articles were nested using the following method:
• In order to achieve nesting of the two intermediate articles, the distal eyelets and the proximal eyelets must be nested. Inner intermediate article was positioned at the end of a straight, circular mandrel. One eyelet of the outer intermediate article was positioned over an eyelet of the inner intermediate article and both intermediate articles were repositioned to the other end of the mandrel. The remaining eyelet of the outer intermediate article was positioned over the remaining eyelet of the inner intermediate article. They were arranged such that, the overlapping wires were equally spaced (about 72° apart) thereby creating a frame. The frame was subsequently FEP coated and covered with an ePTFE bag in order to create the final article.
Example 9Lock Loop Build
• Wire was obtained as described in the previous examples. A lock loop base jig60 (FIG. 24A) withcenter pin22 was placed in custom stand as a manufacturing aid. Abutton component62 configured such that the inner lumen is not round but is keyed to keep from rotating on center pin was obtained. The wire was formed into a loop and the loop was inserted through the lumen of thebutton62. The button with wire loop was threaded ontocenter pin22 with loop toward the opposite side of center pin as the keyed portion of the inner lumen of the button component. The keyed portion of thebutton component62 was situated to the right of the lockloop base jig60. A wire was chosen and bent toward the builder then wrapped 360° around thebutton component62, then wrapped around thecenter pin22 for a minimum of four revolutions and tied off after the fourth revolution. The wire wraps should be spacing apart approximately 1 mm. Loop forming tool64 (FIG. 24B) was inserted in lockloop base jig200 against thecenter pin22. The free wire was wound about 370°shaft66 ofloop forming tool64 then wrapped around thepin68 on theloop forming tool64 and anchored onto the lockloop base jig60. Thebase jig60 andloop forming tool64 were removed from the stand and placed in an oven. The entire assembly was heated in an oven such as described previously for 14 min. at 475° C. The lock loop was removed from thejig60 andloop forming tool64 and the excess wire was trimmed.
Example 10Space Filling Device
• The following embodiments teach a heat set for the device described in Example 7 prior to the application of the cover, hereinafter called the frame of Example 7.
• The frame of Example 7 was placed over about a 2 mm mandrel. Themandrel72 was crimped on both sides if the article in order to secure it from moving. The frame was then placed on thetubular cylinder70 described inFIG. 25A such that the frame outer perimeter rested on the upper edge ofcylinder70.Cap74 was then placed over the frame andcylinder70 as shown inFIG. 25B and secured in place viaset screw76. The entire assembly was then placed in a forced air oven set to 475° C. for 14 minutes. The assembly was removed from the oven and quenched in room temperature water. Theframe78 was subsequently FEP powder coated as described in Example 2.
Example 11Space Filling Anchors
• The following embodiments teach an anchor means for the device described Example 10.
• (a) Ananchor component80 as shown inFIG. 26A was created by the method as generally shown inFIG. 26B. Thewire82 of each of the petals was cut atlocation84 thereby eliminating theremainder86 of the length of the loop, resulting inanchor80.Anchor component80 was next affixed to frame78 as generally shown inFIG. 26C. Thespokes82 ofanchor80 were aligned with the wires offrame78. A tape made from ePTFE film with a thin layer of FEP was wrapped88 around thewires82 and the wires offrame78 and then heated to bond the wires together as shown inFIG. 27.
• The article was powder coated with FEP powder as previously described. Theframe78 was covered as previously described, after whichwires82 were individually manipulated to protrude through the sealingmember106 as shown inFIG. 28.
• (b) In another embodiment, theanchor component80 of Example 11 (a) was further modified as follows.Jig90 andwasher92, as shown inFIGS. 29A and 29B, respectively, were obtained. Theanchor component80 was inserted, eyelet down intojig90, such that eyelet of80 was located insidehole91 and thewires82 were located insidegrooves95 ofjig90.Washer92 was placed on top ofanchor component80 to hold it in place and thewasher92 was secured withscrew323 inhole94, as shown inFIGS. 29A-29C, which caused the points of thewire82 to orient toward the face of the washer.
• (c) In another embodiment, the anchor component80 (shown inFIG. 30) is manufactured as follows:
• An about 1 meter length of 10% platinum drawn filled nitinol wire. (Fort Wayne Metals, Fort Wayne, Ind.) with a diameter of about 0.23 mm is obtained. The specific length of the wire is not measured, it is only necessary that the wire be long enough to complete the winding pattern as described in the following paragraph. The wire is obtained having been electropolished. Electropolishing nitinol wire imparts certain well known properties, such as spontaneously forming a titanium dioxide layer on the surface, selectively reducing the amount of nickel on the surface of the wire, and removing some of the stresses in the wire thus improving fatigue.
• Abase jig8 as described inFIG. 17 is obtained. A knot is tied into one end of one length of an about 0.5 meter long wire and the unknotted end is fed through a wire feed hole10. Two additional lengths of wire (about 1 meter each) are folded in half and the free ends are fed through the remaining fourfeed holes12,14,16,18, with the wire entering the holes at funnel-shaped opening19 (not shown) with the small feed holes at the bottom of opening19. The wires then exit throughholes10,12,14,16 and18 at the flat end surface ofjig8.Weights20 are attached to the free ends of the five wires to hold the wires taut and in place. The base jig is secured in a chuck of a lathe andcenter pin22 is inserted intocenter pin hole24 far enough to securely seat it.
• The other end ofcenter pin22 is located inside thecenter hole28 oftail stock support26 which is chucked into the tail stock, wherein theclosed face30 of thetail stock support26 faces thebase jig8. Thebase jig8 andtail stock support26 are positioned about 5 cm apart. Awire guide34 is used to prevent the wires from crossing. Thebase jig8 is positioned so that the wire feed holes10,12,14,16,18 are oriented vertically above thecenter pin22 and the wires are positioned on the trailing side of thecenter pin22.
• Thepetal jig hole36 is rotated 720°. Thepetal jig38 is inserted into thepetal jig hole36. Without crossing the wires, the wires are placed on top of thepetal jig38. Thebase jig8 is rotated 360° to create the petals of the device. Thebase jig8 is rotated another 720° with the wires placed on top of thecenter pin22.
• With theweights20, thetail stock support26, and thewire guide34 removed, the assembly is placed in a convection oven set to 475° C. for 14 minutes. The assembly is removed from the oven and quenched in water. The jigs are disassembled and the article is removed. The wire ends are trimmed to the eyelets and the anchor loops are fanned in the same direction as the helical winding, such that each anchor loop is oriented 72° offset relative to the adjacent anchor loops. The anchor loops are crimped at the center by hand and heat set again as previously described.
• (d) In another embodiment, anchor components are manufactured by clipping about 2 cm straight lengths of nitinol wire71. A tape made from ePTFE film with a thin layer of FEP is wrapped88 around the wires71 and the wires offrame78 and then heated to bond the wires together as shown inFIG. 31.
Example 12Space Filler with 2 Planes of Anchoring
• A device as previously described in Example 10 with anchors as described in example 11(d) is manufactured by attaching the anchors at multiple locations along the wires offrame78.
• In addition to being directed to the teachings described above and claimed below, devices and/or methods having different combinations of the features described above and claimed below are contemplated. As such, the description is also directed to other devices and/or methods having any other possible combination of the dependent features claimed below.
• Numerous characteristics and advantages have been set forth in the preceding description, including various alternatives together with details of the structure and function of the devices and/or methods. The disclosure is intended as illustrative only and as such is not intended to be exhaustive. It will be evident to those skilled in the art that various modifications may be made, especially in matters of structure, materials, elements, components, shape, size and arrangement of parts including combinations within the principles of the invention, to the full extent indicated by the broad, general meaning of the terms in which the appended claims are expressed. To the extent that these various modifications do not depart from the spirit and scope of the appended claims, they are intended to be encompassed therein.

Claims (7)

1. A medical device comprising:

a first eyelet and a second eyelet defining a longitudinal axis;

a plurality of wires starting at the first eyelet and ending at the second eyelet;

each wire forming a closed teardrop shape the teardrop shape defining an internal area;

wherein the teardrop shape of the wires combine to create an inner peripheral edge and each wire combining to create an outer peripheral edge.

2. A medical device comprising:

a deployed configuration and a delivery configuration with an eyelets located at each opposing end of the device, each eyelet having an inner end and an outer end wherein the inner ends are nearer the middle of the device;

a longitudinal axis extending through both eyelets;

at least three wires having opposing ends that are helically wound together to form the eyelets wherein when viewed from on end in a direction parallel to the longitudinal axis, a middle length portion of each wire is bent into a teardrop shape having a pointed end; and

wherein the bent wire progresses away from the pointed end of the teardrop bending at a larger radius than that of the teardrop shape back to converge with the inner end of each eyelet.

3. A medical device comprising:

at least three wires having opposing ends helically wound together to form two eyelets;

the two eyelets located at a proximal and distal end of the device; and

wherein each wire diverges tangentially away from the eyelet with all wires spaced apart in approximately equal radial amounts; and wherein each wire continues outward and bends gradually in the same direction for about 180° to form an outer diameter of the device and bends inwardly toward the center line of the device with a smaller radius until it again converges with the outer diameter of the device bending inwardly at he larger radius until it reaches the inner end of the proximal eyelet where the proximal ends of all the wires are helically wound together to form the proximal end of the device.

4. A medical device comprising:

a deployed configuration and a delivery configuration, a proximal end and a distal end;

at least three wires which form two eyelets, one at the proximal end and one at the distal end; and

wherein while in the deployed configuration at least one of the wires assumes a reniform shape.

5. A medical device comprising:

a deployed configuration and a delivery configuration, a proximal end and a distal end;

at least three wires which form two eyelets, one at the proximal end and one at the distal end and a longitudinal axis extending through the eyelets; and

wherein while in the deployed configuration at least one of the wires forms a teardrop shape as viewed from one end along the longitudinal axis of the device.

6. A septal occluder device comprising:

a plurality of wire forms wherein each wire form starts and stops at an eyelet;

each of the wire forms having an internal radial surface and an external radial surface.

7. A defect closure device comprising a shape having a wire frame including opposing ends having a larger diameter and a middle region with a smaller diameter, wherein the middle region substantially fully occupies the defect without appreciably enlarging the defect.

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