US20190125557A1 - Expansion ring for a braided stent - Google Patents

Abstract

A braided stent system includes a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween and a first expansion ring connected to the lumen of the stent body. The first expansion ring may include a frame defined by a plurality of interconnected support assemblies that are selectively positioned to impart an outwardly expanding radial force to the stent body, each support assembly can include a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection. Each support assembly can include a claw portion mechanically connected to one or more of the interstices of the stent body so that the frame imparts an outward radial expansion force of the stent to facilitate use and delivery of the stent.

Description

• This application is a Divisional of U.S. Ser. No. 15/299,918 filed Oct. 21, 2016, the entirety is incorporated herein by reference.
FIELD
• The present disclosure relates generally to treatment of certain defects in a vasculature of a patient and more particularly, to self-expanding braided stents to a treatment site in a vasculature of a patient.
BACKGROUND
• Stents are understood as tubular reinforcements that can be inserted into a blood vessel to provide an open path within the blood vessel. Stents have been widely used in intravascular angioplasty treatment of occluded cardiac arteries, wherein the stent may be inserted after an angioplasty procedure to prevent restenosis of the artery. Stents are often deployed by use of delivery devices which cause the stent to open with the objective of reinforcing the artery wall and provide a clear through-path in the artery thereby preventing restenosis.
• However, the weakness and non-linear nature of the neurovasculature limits the applicability of such stents in procedures, for example, in repairing neurovascular defects. Furthermore, known delivery methods are less useful in vasoocclusive surgery, particularly when tiny vessels, such as those found in the brain, are to be treated. Accordingly, a need exists for a stent that can be used with delivery techniques in vasoocclusive treatment of neurovascular defects that provides selective reinforcement in the vicinity of the neurovascular defect. A need also exist for a stent that reduces trauma or risk of rupture to the blood vessel. It is with respect to these and other considerations that the various embodiments described below are presented.
SUMMARY
• In some aspects, the present disclosure relates to a braided stent system for delivery into a blood vessel is disclosed. They system may include a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween. An expansion ring may be mechanically connected to the lumen of the stent body and be operable to maintain the expansion ring in an opened state by having its frame impart an outwardly expanding radial force to the stent body. The frame may include plurality of legs joined at a first intersection and a claw portion mechanically connected to one or more of the interstices of the stent body. The claw portion may mechanically connect the expansion ring to one or more of the interstices by extending away from the first intersection through a plurality of the interstices and terminating at a locking mechanism opposite the first intersection.
• In certain embodiments, the claw portion may include at least two aligned elongate members that extend between the first intersection and the locking mechanism to form a void therebetween. One or a plurality of the interstices may pass through the void as the claw portion mechanically connects the expansion ring to the stent body. The plurality of legs of the frame may also be bowed and/or oriented in a non-linear configuration causing the frame to be resistant to compression so that the braided stent system is self-expanding. The legs may be rotatable, pivotable, and/or twistable a predetermined amount about the first intersection.
• In other embodiments, a braided stent system is disclosed having a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween and a first expansion ring connected to the lumen of the stent body. The first expansion ring may include a frame defined by a plurality of interconnected support assemblies that are selectively positioned to impart an outwardly expanding radial force to the stent body, each support assembly can include a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection. Each support assembly can also include a claw portion mechanically connected to one or more of the interstices of the stent body.
• The plurality of legs of the frame may be bowed and/or oriented in a non-linear configuration causing the frame to be resistant to compression so that the braided stent system is self-expanding. The legs may be rotatable, pivotable, and/or twistable a predetermined amount about the first intersection.
• The claw portion may also mechanically connect the expansion ring to inner and outer portions of the lumen by extending away from the first intersection, being interlaced through at least two of the interstices, and being terminated at a locking mechanism opposite the intersections. The locking mechanism may include a T-shaped end or outwardly extending hooked members operable to fixedly connect to the interstices of the stent body. The solution is not so limited, however, and at least one of the claw portions may include a plurality of aligned elongate members that extend between respective first intersections and locking mechanisms to form a void through which the plurality of interstices can pass.
• In an example embodiment, one or a plurality of braided pairs of the braided members can pass through the void. The locking mechanism may also fixedly connect the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through welding, soldering, crimping, or an adhesive bond. The solution is not so limiting, however, and the locking mechanism may fixedly connect the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through a fastener such as a metallic band and/or ring. Additionally, at least one of the first and/or second intersections can form a V-shape, a U-shape, or an elliptical curve.
• In another example embodiment, the stent body can include a proximal end, a distal end, and a central portion disposed therebetween. The first expansion ring can be disposed on or adjacent the distal or proximal ends of the stent body with the second intersections of the interconnected support assemblies being joined at or adjacent the respective distal or proximal ends. One or more additional expansion rings can also be connected to the lumen along or in connection with the central portion of the stent body and/or the opposing, distal or proximal end of the stent body.
• A method of deploying a braided stent body into a vessel is also disclosed, the method comprising the following steps: assembling a plurality of expansion rings to a lumen of the braided stent body, the lumen of the braided stent body being formed by a plurality of braided members with interstices formed therebetween; selectively positioning each expansion ring with the braided stent body; each expansion ring imparting an outwardly expanding radial force thereby maintaining the lumen of the braided stent body in an opened position, each expansion ring comprising: a frame defined by a plurality of interconnected support assemblies comprising a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection, the legs being twistable about the first and second intersections; and a claw portion disposed opposite the first and second intersections; mechanically connecting the claw portion of each ring to an inner portion of the stent body by interlacing a first elongate member extended between the respective claw portion and the respective first intersection of the expansion ring with one or more of the interstices and terminated at a locking mechanism opposite the intersections; and translating the braided members in the vessel independently from each expansion ring.
• Since at least one of the claw portions can include a second alignment member substantially aligned with the first elongate member and extended between respective first intersections and locking mechanisms, the method can also include forming a void between the first and second elongate members and respective first intersections and locking mechanisms; and passing one or a plurality of braided pairs of the braided members through the void. The method may also include fixedly connecting the expansion ring to the stent body by joining ends of the first and second elongate members opposite the first intersection through welding, soldering, crimping, an adhesive bond, and/or a fastener.
• Other aspects and features of the present disclosure will become apparent to those of ordinary skill in the art, upon reviewing the following detailed description in conjunction with the accompanying figures.
BRIEF DESCRIPTION OF THE DRAWINGS
• Reference will now be made to the accompanying drawings, which are not necessarily drawn to scale.
• FIG. 1 depicts a side plan view of one embodiment of the herein disclosed expansion ring assembled at an end of a tubular braided stent body.
• FIG. 2 depicts is another view of one embodiment of the herein disclosed expansion ring assembled with a tubular braided stent body.
• FIG. 3 is a close-up view of plane A-A ofFIG. 2 showing certain features of the expansion ring assembled with the tubular braided stent body.
• FIG. 4A is a side plan view of certain features of an exemplary expansion ring having support assemblies.
• FIG. 4B is a side plan view of certain features of an exemplary expansion ring having support assemblies.
• FIG. 4C is a side plan view of certain features of an exemplary expansion ring having support assemblies.
• FIG. 5A is a perspective of an exemplary expansion ring with multiple claws prior to being assembled with a tubular braided stent body.
• FIG. 5B is forward plan view of an example prototype of the exemplary expansion ring ofFIG. 5A when assembled with a tubular braided stent body showing its inner lumen in a compressed state at a cross-section of the tubular braided stent body aft of the claw.
• FIG. 5C is a forward plan view of the exemplary expansion ring ofFIG. 5B when assembled with a tubular braided stent body showing its inner lumen in a compressed state at a cross-section of the claw.
• FIG. 6 depicts a side plan view of exemplary expansion rings having multiple claws when assembled at respective proximal and distal ends of a tubular braided stent body.
• FIG. 7 is a close-up view of plane B-B ofFIG. 6 showing certain features of one of the depicted expansion rings weaved through interstices of the tubular braided stent body with a fixed attachment.
• FIG. 8 depicts a side plan view of exemplary expansion rings having multiple claws when assembled at proximal and distal ends of a tubular braided stent body as well as at least one expansion ring placed along the body between the distal and proximal ends.
• FIG. 9A depicts a side plan view of an exemplary expansion ring assembled with a tubular stent body, wherein a claw of the expansion ring is being secured using a single braid wire pair of the tubular stent body.
• FIG. 9B depicts a side plan view of an exemplary expansion ring assembled with a tubular stent body, wherein a claw of the expansion ring is being secured using two braided wire pairs of the tubular stent body.
• FIG. 9C depicts a side plan view of an exemplary expansion ring assembled with a tubular stent body, wherein a claw of the expansion ring is being secured using three braided wire pairs of the tubular stent body.
• FIG. 10A depicts a close up side plan view of an exemplary expansion ring assembled with a tubular stent body depicting certain features of the expansion ring entering and exiting braids of the tubular stent body in a first arrangement.
• FIG. 10B depicts a close up side plan view of an exemplary expansion ring assembled with a tubular stent body depicting certain features of the expansion ring entering and exiting braids of the tubular stent body in a second arrangement.
• FIG. 10C depicts a close up side plan view of an exemplary expansion ring assembled with a tubular stent body depicting certain features of the expansion ring entering and exiting braids of the tubular stent body in a third arrangement.
• FIG. 11A depicts a close up side plan view of an exemplary expansion ring assembled with a tubular stent body depicting an embodiment having T-shaped endings.
• FIG. 11B depicts a close up side plan view of an exemplary expansion ring assembled with a tubular stent body depicting an embodiment having hook-shaped endings.
• FIG. 12A depicts a side plan view an example prototype of one example ring assembled with a tubular stent body along a longitudinal cross section of a claw assembled with the tubular stent body.
• FIG. 12B depicts a side plan view of an example prototype of one example ring assembled with a tubular stent body along a longitudinal cross section of a claw assembled with the tubular stent body.
DETAILED DESCRIPTION
• Although example embodiments of the disclosed technology are explained in detail herein, it is to be understood that other embodiments are contemplated. Accordingly, it is not intended that the disclosed technology be limited in its scope to the details of construction and arrangement of components set forth in the following description or illustrated in the drawings. The disclosed technology is capable of other embodiments and of being practiced or carried out in various ways.
• It must also be noted that, as used in the specification and the appended claims, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. By “comprising” or “containing” or “including” it is meant that at least the named compound, element, particle, or method step is present in the composition or article or method, but does not exclude the presence of other compounds, materials, particles, method steps, even if the other such compounds, material, particles, method steps have the same function as what is named.
• In describing example embodiments, terminology will be resorted to for the sake of clarity. It is intended that each term contemplates its broadest meaning as understood by those skilled in the art and includes all technical equivalents that operate in a similar manner to accomplish a similar purpose. It is also to be understood that the mention of one or more steps of a method does not preclude the presence of additional method steps or intervening method steps between those steps expressly identified. Steps of a method may be performed in a different order than those described herein without departing from the scope of the disclosed technology. Similarly, it is also to be understood that the mention of one or more components in a device or system does not preclude the presence of additional components or intervening components between those components expressly identified.
• As discussed herein, vasculature of a “subject” or “patient” may be vasculature of a human or any animal. It should be appreciated that an animal may be a variety of any applicable type, including, but not limited thereto, mammal, veterinarian animal, livestock animal or pet type animal, etc. As an example, the animal may be a laboratory animal specifically selected to have certain characteristics similar to a human (e.g., rat, dog, pig, monkey, or the like). It should be appreciated that the subject may be any applicable human patient, for example.
• Braided stents may be formed from a plurality of elongate members (e.g. metal wires, polymeric fibers, or strands of material) and these members can be very useful in treatment of neurovascular defects. However, when such braided members are intended to be self-expanding in a lumen of a stent body, known manners of activation of the initially expanding end struggle to adequately, reliably, and fully open so that the initially expanding end can be used as an anchor point. Moreover, braided stents have been known to exhibit high internal friction that resists the inherent radial expansion force of the self-expanding braided stent when being deployed to an opened state. More specifically, the relatively high internal friction can render it difficult to open the initially expanding end of the stent which results in deficiencies in anchoring and deployment. This is particularly true for braided stents delivered to the desired vessel location through use of a delivery sheath, microcatheter, or the like, since in a closed state (e.g. compressed or crimped) the stent body typically exhibits friction between the braided members and the delivery sheath or microcatheter.
• In practice, braided stents can be delivered to a particular vessel by advancing a blunt surface against a proximal end of the braided stent causing the braided stent to axially compress and expand radially. This expansion within the delivery sheath or microcatheter can result in an increased normal force being applied to the inner surface of the delivery sheath, microcatheter, or the like thereby also increasing friction caused by the braided stent.
• Known solutions to these issues have depended on factors such as material, size, cell design, internal friction, and extra manipulation by the end-user to reliably, quickly and adequately open the braided stents. In turn, success of the braided stent relied heavily on end-user accuracy in delivery which unnecessarily increases risk of injury to the patient.
• Moreover, such braided, self-expanding stents can be difficult to recapture after being delivered and/or deployed. It is to be understood that a “self-expanding” stent is a stent wherein the particular stent fully deploys upon emerging through a delivery device such as a sheath, microcatheter, or the like. In this respect, when a self-expanding stent body emerges, unrestrained outside of the respective delivery device, the self-expanding braided stent should expand and be deployed in the vasculature. However, due to the referenced radial forces and friction, stent deployment and recapture following deployment is difficult.
• The herein disclosedexpansion ring1 resolves these and other issues by providing a secure, mechanical attachment betweenring1 and the corresponding, braidedstent body12 that increases an outwardly extending radial expansion force of an initialproximal deployment end6 ofbody12, an opposingdistal end8 ofbody12, and/or a central portion defined between eachend6 and8. Instead,ring1 includes one or a plurality ofinterconnected support assemblies10 that collectively cause the ring to fully anchor itself with the lumen20 ofbody12 by mechanically securing aclaw17 of eachassembly10 to be interlaced with the braided,elongate members22 ofbody12. As a result, the total internal friction ofbody12 is reduced andmembers22 can movebody12 independent fromring1 as discussed more particularly below. Assembling one or moremultiple rings1 withbody12 results in relatively easy delivery without the need for accurate positioning ofring1 withbody12. In turn, deployment of thebody12 within the vasculature is more reliable with reduced risk of injury for the end-user.
• In the following description, references are made to the accompanying drawings that form a part hereof and that show, by way of illustration, specific embodiments or examples. In referring to the drawings, like numerals represent like elements throughout the several figures. Turning toFIGS. 1 and 2, a side plan view of the herein disclosedring1 andcorresponding support assemblies10 is shown disposed at aproximal end6 ofbody12 which may be the later deployed end.FIG. 1 is a close up view of one embodiment ofring1 when assembled withbody12 whereasFIG. 2 shows more ofbody12 when anexemplary ring1 is assembled withbody12. It is to be understood thatbody12 may also include a distal end8 (also known as an initially-deployed end) opposite itsproximal end6 as seen more clearly inFIG. 6, andring1 may be mechanically connected atdistal end8 and/or disposed at any positioned between ends6 and8.
• As can be seen,body12 ofFIGS. 1 and2 may be formed from a plurality ofelongate members22 braided or otherwise arranged to form a plurality ofinterstices24.Members22 may be formed from two or more metal wires, or polymeric fibers or strands of material.Ring1 may be constructed from one or multipleinterconnect support assemblies10 that together form a frame ofring1 that is capable of imparting one or more additive radial forces to an inner wall and/or an outer wall of lumen20. In this regard,ring1 may be selectively positioned and arranged for rapidly opening and/or maintainingbody12 in an opened position without having to weld, solder, glue, or otherwise connectring1 tobody12 itself
• Turning toFIG. 3 is a close up view of plane A-A ofFIG. 2 more clearly showing anexemplary claw17 of oneassembly10 interlaced with theinterstices24 and braided,elongate members22. As can be seen,assembly10 may include afirst leg28 joined with asecond leg30 at afirst intersection31. Whilelegs28 and30 are seen integrally formed with each other inFIG. 3, eachassembly10 is not so limited andlegs28 and30 may be removably attached to each other through a fastener including a band, bolt, clamp, coupling, dowel, hook, latch, key, or the like.Legs28 and30 may also be adhered to each other or welded to formintersection31. Additionally, if one or more fasteners are used in a particular implementation, they can be removably connected or welded, soldered, and/or crimped. Fasteners and/orlegs28 and30 can be formed of a radiopaque metal, such as platinum or tantalum, or may be formed of a non-radiopaque material, such as stainless steel.
• By addingclaw17 to the end of a crown of eachassembly10, eachring1 is allowed to interlace withbody12 without a permanent or rigid attachment tobody12 such as welding, soldering or a chemical adhesive. Once theclaw17 is effectively interlaced and connected with thebody12 and the desired location, braidedmembers22 can also move independently fromring1 which removes the adverse impact that a permanent or rigid attachment previously had onbody12 to fully expand when assembled with an expansion ring.
• Intersection31 may also include a rotatable and/or twistable coupling so that eachassembly10 ofring1 is capable of flexing a predetermined amount whenbody12 andring1 is in use. One or moreelongate members18 may extend fromintersection31 and terminate at alocking mechanism40opposite intersection31 andlegs28 and30. In the embodiment ofFIG. 3, a plurality ofelongate members18 are shown substantially aligned and offset from each other while being joined atmechanism40 to form avoid5 therebetween.
• In order to mechanically attach tobody12, eachclaw17 may have respective members passed through and/or interlaced withinterstices24 andmembers22 and then joined atmechanism40. In this regard, one or more multiple braided pairs26 ofmembers22 may be arranged in or in connection withvoid5 so thatclaw17 may be mechanically attached to inner and outer portions of lumen20.Mechanism40 ofFIG. 3 may be formed from a weld, crimp, band, clamp, or adhesive so that each ofmembers18 are fixedly attached to each other.
• Turning toFIGS. 4A through 4C are depictions ofrings1 havingmultiple assemblies10 though any number ofassemblies10 could be used as needed or required depending on need or preference.FIG. 4A specifically depicts twointerconnected support assemblies10 interconnected at asecond intersection32 withleg28 extended therefrom towardsintersection31.FIG. 4B similarly depicts threeinterconnected assemblies10 andFIG. 4C depicts fourinterconnected assemblies10. It is to be understoodassemblies10 may be integrally formed with each other atintersection32 or may be joined together using any of the herein described fasteners. It is to be understood that eachassembly10 can be a compression element capable of flexing a predetermined amount such thatFIG. 4A depicts two compression elements,FIG. 4B depicts three compression elements, andFIG. 4C depicts four compression elements. In this respect,ring1 with corresponding compression elements can move between a compressed configuration before deployment within the vasculature as well as a deployed configuration with a lumen20 having a greater diameter than the compressed configuration. Additionally,legs28 and30 of eachassembly10 atintersections31 and/or32 may be formed as a V-shape as shown inFIGS. 4A through 4C with acute and/or oblique angles formed betweenlegs28 and30. Optionally, instead of being V-shaped,legs28 and30 of eachassembly10 can be formed as “U” shaped, elliptical shaped, curved generally, loop or bight at the junction portion.
• Turning toFIG. 5A is a perspective view ofexemplary ring1 with a plurality ofinterconnected assemblies10. While eachassembly10 may be V-shaped as inFIGS. 4A-4C,FIG. 5A depicts how eachassembly10 may be arranged in a bowed orientation. In this regard,legs28 and/or30 may include a curved or arched portion that bows with a predetermined resistance to compression. It is to be understood that eachassembly10 ofring1 may have the same or a different resistance so that eachring1 can be individualized for the specific vasculature implementation.FIG. 5B is a forward plan view of an example prototype ofring1 ofFIG. 5A when assembled withbody12 in a compressed state at a cross section ofbody12 aft ofclaw17 to show each oflegs28 and30 and lumen20 ofbody12. Adelivery mechanism150 is depicted in lumen20 for positioning and assembling eachring1 with the inner and outer surfaces of body20. Similarly,FIG. 5C a forward plan view ofring1 ofFIG. 5B when assembled withbody12 showing its inner lumen20 in a compressed state at a cross-section ofclaw17 with example delivery mechanism50. As can be seen, in a compressed state eachring1 is operable to assemble with inner and outer surfaces ofbody12 while also providing outward expanding radial forces to the stent body to counter the inwardly applied compression in the compressed state.
• Eachassembly10 and its constituent features may be formed of a superelastic material, such as a nickel-titanium alloy or Nitinol, or may be formed of a non-superelastic material, such as spring steel or MP35N, an alloy of 35% nickel, 35% cobalt, 20% chromium, and 10% molybdenum, by weight.Legs28 and30 of eachassembly10 may also be formed from a shape memory material having a shape memory position in the opened state.
• Turning to FIG.6, a side plan view ofrings1 being assembled at both ends6 and8 ofbody12 is shown. It can be seen thatclaw17 of eachassembly10 is oriented to mechanically connect with braidedmembers22 ofbody12 whereas opposingintersections32 of eachassembly10 is in communication withends6 and8, respectively. It also to be understood thatintersection32 of eachassembly10 formed from joinedlegs28 and30 may be mechanically connected to one ormore members22 andinterstices24 similar to claw17. In this regard,legs28 and30 atintersection32 do not need to directly attach tobody12, for example, by being welded or fastened directly tobody12 itself. Instead, similar tointersection31,legs28 and/or30 can be directly joined together by being passed through one or more interstices24 and interlaced with associatedmembers22, be joined together, and extend back towardsrespective intersections31.
• FIG. 7 depicts a close-up view of plane B-B ofFIG. 6 depicting anexemplary claw17 interlaced withmembers22 andinterstices24. More specifically,legs28 and30 can be seen being joined together atintersection31 with each oflegs28 and30 disposed within lumen20. After being joined atintersection31, claw17 may have a plurality of substantially alignedelongate members18 that extend fromintersection31 towardsmechanism40 to formvoid5.Mechanism40 may include any of the previously described fasteners that join each ofmembers18 together or may be a weld, crimp, chemical adhesive, or the like. It can also be seen that two braidedpairs26 ofmembers22 pass throughvoid5 and are therefore interlaced with inner and outer portions of lumen20 andmembers24 ofbody12. However, the herein disclosed solution is not so limiting and as shown inFIGS. 9A-9C, eachmember18 andcorresponding void5 ofclaw17 can be weaved withmembers22 in a variety of ways. For example, only one braidedpair26 can interlaced withmembers18 andvoid5 of claw17 (FIG. 9A), two braidedpairs26 can interlace withmembers18 andvoid5 of claw17 (FIG. 9B), and/or three braidedpairs26 can interlace withmembers18 andvoid5 of claw17 (FIG. 9C).Members18 ofFIGS. 9A-9C may enter and exit braided pairs26 at the same location along braidedbody12.
• FIG. 8 similarly depicts a side plan view ofrings1 being selectively positioned at ends6 and8 as well asring1 being disposed betweenends6 and8 along a central portion ofbody12. It is to be understood that the embodiment ofFIG. 8 is not intended to be limiting and any number ofrings1 can be included betweenends6 and8.
• Turning toFIGS. 10A-10C, additional exemplary side plan views ring1 assembled withbody12 are shown. Specifically, inFIG. 10A three braidedpairs26 are shown interlaced withvoid5 and associatedmembers18, wherein portions ofclaw17 are shown exiting and entering respective braided pairs26 whenclaw17 interlaces with braidedbody12 and mechanically attaches thereto. In contrast,claws17 ofFIGS. 10B and 10C enter and exit at different locations ofmembers22 andinterstices24 than ofFIG. 10A even when three braidedpairs26 are in communication withvoid5.
• Alternative claw designs are also contemplated for use withassemblies10 ofring1. For example, inFIG. 11A, it can be seen that claw17acan include only a single elongate member18aextended fromintersection31aand terminating in a T-shapedlocking mechanism40a. In this embodiment, claw17acan interlace with abraided pair26 overintersection31a, extend to an outer portion ofbody12 until terminating in a T-shaped member ofmechanism40 that can interlace withmultiple interstices24 ofbody12 to mechanically connectclaw17atobody12. In another alternative embodiment ofFIG. 11B, claw17bcan be seen with a plurality of elongate members18bextended betweenintersection31band hooked-end locking mechanism40b. Either or both of members18bmay interlace withmembers22 and one or a plurality of braided pairs26 and terminate in a hooked member ofmechanism40b. The hooked member ofmechanism40bmay have an upwardly extended hooked portion operable to mechanically secure each member18bto abraided pair26. Both ofmechanisms40aand40bmay be used in place of welding, an adhesive, crimping, or a fastener of the previously disclosedmechanisms40.
• Turning toFIGS. 12A and 12B, each figure depicts side plan views prototypes ofexample claws17 when assembled withbody12 along a longitudinal cross section ofclaw17. As shown in each ofFIGS. 12A and 12B,mechanism150 andcorresponding bump152 can positionmember18 andcorresponding gap5 with one ormore members22 and/or pairs26.FIGS. 12A and 12B are not intended to be limiting and claw17 and/or its constituent features may be assembled withbody12 with or withoutmechanism150 as needed or desired.
• The specific configurations, choice of materials and the size and shape of various elements can be varied according to particular design specifications or constraints requiring a system or method constructed according to the principles of the disclosed technology. Such changes are intended to be embraced within the scope of the disclosed technology. The presently disclosed embodiments, therefore, are considered in all respects to be illustrative and not restrictive. It will therefore be apparent from the foregoing that while particular forms of the disclosure have been illustrated and described, various modifications can be made without departing from the spirit and scope of the disclosure and all changes that come within the meaning and range of equivalents thereof are intended to be embraced therein.

Claims (14)

What is claimed is:

1. A braided stent system, the system comprising:

a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween; and

an expansion ring mechanically connected to the lumen of the stent body, the expansion ring comprising a frame that imparts an outwardly expanding radial force to the stent body, the frame comprising a plurality of legs joined at a first intersection and a claw portion mechanically connected to one or more of the interstices of the stent body.

2. The system ofclaim 1, wherein the claw portion mechanically connects the expansion ring to one or more of the interstices by extending away from the first intersection through a plurality of the interstices and terminating at a locking mechanism opposite the first intersection.

3. The system ofclaim 2, the claw portion comprising at least two aligned elongate members extended between the first intersection and the locking mechanism to form a void through which the plurality of interstices pass.

4. The system ofclaim 2, wherein the locking mechanism includes one of a T-shaped end or outwardly extending hooked members operable to fixedly connect to the interstices of the stent body.

5. The system ofclaim 2, wherein the locking mechanism fixedly connects the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through welding, soldering, crimping, or an adhesive bond.

6. The system ofclaim 2, wherein the locking mechanism fixedly connects the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through a metallic band or ring.

7. The system ofclaim 1, wherein the plurality of legs of the frame are bowed causing the frame to be resistant to compression, the legs being twistable a predetermined amount about the first intersection.

8. The system ofclaim 1, wherein the first intersection forms a V-shape, a U-shape, or an elliptical curve.

9. The system ofclaim 1, wherein the stent body comprises a proximal end, a distal end, and a central portion disposed therebetween, and

wherein the expansion ring is connected on or adjacent the distal or proximal ends of the stent body.

10. A method of deploying a braided stent body into a vessel, the method comprising:

assembling a plurality of expansion rings to a lumen of the braided stent body, the lumen of the braided stent body being formed by a plurality of braided members with interstices formed therebetween;

selectively positioning each expansion ring with the braided stent body;

each expansion ring imparting an outwardly expanding radial force thereby maintaining the lumen of the braided stent body in an opened position, each expansion ring comprising: a frame defined by a plurality of interconnected support assemblies comprising a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection, the legs being twistable about the first and second intersections; and a claw portion disposed opposite the first and second intersections;

mechanically connecting the claw portion of each ring to an inner portion of the stent body by interlacing a first elongate member extended between the respective claw portion and the respective first intersection of the expansion ring with one or more of the interstices and terminated at a locking mechanism opposite the intersections; and

translating the braided members in the vessel independently from each expansion ring.

11. The method ofclaim 10, further comprising: bowing the legs of each expansion ring causing each ring to be resistant to compression.

12. The method ofclaim 10, wherein at least one of the claw portions comprises a second alignment member substantially aligned with the first elongate member and extended between respective first intersections and locking mechanisms, the method further comprising:

forming a void between the first and second elongate members and respective first intersections and locking mechanisms; and passing a plurality of braided pairs of the braided members through the void.

13. The method ofclaim 12, further comprising: fixedly connecting the expansion ring to the stent body by joining ends of the first and second elongate members opposite the first intersection through welding, soldering, crimping, an adhesive bond, or a fastener.

14. The method ofclaim 12, further comprising:

connecting at least one of the expansion rings to a proximal end of the stent body; and

connecting at least one of the expansion rings to a distal end of the stent body.

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