US20090131831A1 - Variable Stiffness Guidewire Systems - Google Patents

Abstract

A variable stiffness guidewire comprises a outer body including a plurality of coil windings that are oriented in a first direction. The outer body has a proximal end and a distal end and a hollow interior therebetween. A tension element is positioned within the hollow interior and has first and second opposed ends, wherein the second end is coupled to the distal end of the outer body. The tension element includes a plurality coil windings that are oriented in a second direction opposite to the first direction. The tension element is configured to be pulled in a direction away from the distal end of the outer body to increase a stiffness in at least a portion of the guidewire.

Description

STATEMENT OF RELATED APPLICATIONS
• The present application claims the benefit of priority based on United States Provisional Patent Application Ser. No. 61/005,745, filed on Dec. 7, 2007, and Provisional Patent Application Ser. No. 61/003,404, filed on Nov. 15, 2007, both in the name of inventors Jay Wright and Samuel Ahn, and entitled “Variable Stiffness Guidewire Systems.”
TECHNICAL FIELD
• The present disclosure relates generally to variable stiffness guidewire systems.
BACKGROUND
• FIG. 1A illustrates an example of an existing variable stiffness guidewire system. As shown inFIG. 1A, theguidewire10 is shown inside the aorta A of a patient, wherein theguidewire10 is shown inserted through a proximal opening of acatheter hub12 of acatheter14 and extending out of a distal opening orlumen16 of thecatheter14. Theguidewire10 shown inFIG. 1A has the ability to obtain variable stiffness to allow it to travel through different arterial branches and also be stable such that the weight of thecatheter14 and/or other instruments (e.g. balloon catheter, sensors) or drugs may be delivered to the desired location of the patient during a medical procedure. The stiffness of theguidewire10 is variably adjusted at the proximal end by the physician by pulling a head (not shown) of the guidewire away a desired distance from thecoil body18 of the guidewire. However, the head of theguidewire10 is small in diameter such that pulling the head away from thecoil body18 usually requires the assistance of atool20.
• As shown inFIG. 1A, thetool20 is significantly larger than theguidewire10 which allows the user to comfortably manipulate thetool20 andguidewire10. However, this configuration of guidewire10 andtool20 is disadvantageous considering that thetool20 is relatively larger in diameter than that of theguidewire10. Thus, the relativelylarger tool20 does not allow loading and/or unloading of other components over thecatheter14 at itsproximal end12 without first removing thetool20 from theguidewire10. Removing thetool20 may cause the loss of tension between the head and coil body ofguidewire10, thereby effectively causing loss in the desired stiffness and stability in the guidewire to deliver the instruments or drugs to the desired location within the patient.
• Accordingly, a need exists for a variable stiffness guidewire system and tool which allows adjusting of the guidewire stiffness as well as maintaining that stiffness to allow loading and unloading of instruments or drugs to the desired location within the patient without losing or compromising the maintained stiffness in the guidewire.
OVERVIEW
• Systems for the flexible catheterization of arterial branches by the percutaneous entry techniques and, more particularly, such systems provide a variable stiffness guidewire for advancement into the lumens of branched arteries, vessels and cavities remote from the point of entry of the catheter. The systems include removable devices for selectively maintaining guidewire stiffness by maintaining tension after removal of the actuator, or tool. Further, the system includes a mechanism for selectively inserting the removable devices on the tensioned end of the guidewire.
• In an embodiment, a variable stiffness guidewire comprises a outer body including a plurality of coil windings that are oriented in a first direction. The outer body has a proximal end and a distal end and a hollow interior therebetween. A tension element is positioned within the hollow interior and has first and second opposed ends, wherein the second end is coupled to the distal end of the outer body. The tension element includes a plurality coil windings that are oriented in a second direction opposite to the first direction. The tension element is configured to be pulled in a direction away from the distal end of the outer body to increase a stiffness in at least a portion of the guidewire.
• In an embodiment, a variable stiffness guidewire comprises an outer body which includes a plurality of coil windings oriented in a first direction. The outer body has a proximal end and a distal end. A tension element includes a plurality coil windings oriented in a second direction opposite to the first direction between first and second opposing ends, wherein the tension element is positioned within the outer body. The second end of the tension element is coupled to the distal end of the outer body. A head is coupled to the first end of the tension element, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.
• In an embodiment, a method comprises selecting a variable stiffness guidewire having an outer body including a proximal end and a distal end. The outer body has a plurality of coil windings therebetween oriented in a first direction. The variable stiffness guidewire includes a tension element that is positioned within the outer body and has a second end coupled to the distal end of the outer body. The tension element has a plurality coil windings that are oriented in a second direction opposite to the first direction. The method includes operating the variable stiffness guidewire such that distal end is oriented in a desired direction. The method includes pulling a first end of the tension element in a direction away from the proximal end of the outer body to increase a stiffness in at least a portion of the guidewire, wherein the distal end remains substantially at the desired location while the stiffness is increased.
• In any or all of the embodiments, a head is coupled to or integrally formed with the tension element at the first end, wherein the head has a cross sectional dimension no greater than a diameter of the outer body. In an embodiment, the second end of the tension element is crimped to the distal end of the outer body. In an embodiment, the outer body further comprises a collar at the proximal end. In an embodiment, the distal end of the outer body remains substantially stationary while stiffened when the tension element is pulled. In an embodiment, the first direction is a clockwise direction and the second direction is a counter-clockwise direction.
BRIEF DESCRIPTION OF THE DRAWINGS
• The accompanying drawings, which are incorporated into and constitute a part of this specification, illustrate one or more examples of embodiments and, together with the description of example embodiments, serve to explain the principles and implementations of the embodiments.
• In the drawings:
• FIG. 1 illustrates a variable stiffness guidewire in accordance with the prior art.
• FIG. 2A illustrates a variable stiffness guidewire in accordance with an embodiment.
• FIG. 2B illustrates a perspective view of the proximal end of the guidewire body in accordance with an embodiment.
• FIG. 2C illustrates a side view of the distal end of the guidewire body in accordance with an embodiment.
• FIG. 2D illustrates an end view of the distal end of the guidewire body in accordance with an embodiment.
• FIGS. 3A-3B illustrate diagrams of guidewire tensioning tool embodiments.
• FIGS. 4A-4D illustrate detailed views of the guidewire engagement mechanism in accordance with embodiments.
• FIGS. 5A-5C illustrates perspective views of the guidewire engaging feature of the tool in accordance with embodiments.
• FIG. 6A illustrates a perspective view of the guidewire engaging feature of thetool200 in accordance with an embodiment.
• FIG. 6B illustrates a cross sectional view of the aperture ofFIG. 6A along section B-B in accordance with an embodiment.
• FIG. 6C illustrates an alternate cross sectional view of the aperture ofFIG. 6A along section C-C in accordance with an embodiment.
• FIGS. 7-10 illustrate diagrams of tools in accordance with different embodiments.
• FIG. 11 illustrates a perspective view of a C-shaped guidewire insert in accordance with an embodiment.
• FIG. 12 illustrates a perspective view of a clamshell guidewire insert in accordance with an embodiment.
• FIGS. 13A-13C illustrate perspective views of a selectively openable guidewire insert in accordance with an embodiment.
• FIG. 13D illustrates a perspective view of a guidewire with combinable cartridges in accordance with an embodiment.
• FIG. 14 illustrates a perspective view of an insert placement tool in accordance with an embodiment.
• FIG. 15 illustrates a perspective view of self-maintaining guidewire in accordance with an embodiment.
• FIG. 16 illustrates a perspective view of self-maintaining guidewire in accordance with an embodiment.
• FIG. 17A illustrates a side view of a combined tensioning and insert applicator deployment tool in accordance with an embodiment.
• FIG. 17B illustrates an elongated barrel tray in accordance with an embodiment.
• FIG. 18 illustrates a top view of the combined tensioning and insert applicator deployment tool in accordance with an embodiment.
• FIG. 19 illustrates a broken view of a magazine for use in a deployment tool in accordance with an embodiment.
• FIGS. 20 and 21 illustrate operation of the magazine with the deployment tool in accordance with an embodiment.
• FIG. 22A illustrates a side view of a combined tensioning as well as an cartridge applicator and removal tool in accordance with an embodiment.
• FIG. 22B illustrates operation of the magazine with the removal tool in accordance with an embodiment.
• FIG. 23A illustrates a perspective view of a guidewire with integrated tension head and tension maintaining mechanism in accordance with an embodiment.
• FIG. 23B illustrates a perspective view of a guidewire with integrated tension head and tension maintaining mechanism in accordance with an embodiment.
• FIG. 24 illustrates a side view of the integrated guidewire tension maintaining head with a deployment tool in accordance with such an embodiment.
DETAILED DESCRIPTION
• Example embodiments are described herein in the context of a variable stiffness guidewire system. Those of ordinary skill in the art will realize that the following description is illustrative only and is not intended to be in any way limiting. Other embodiments will readily suggest themselves to such skilled persons having the benefit of this disclosure. Reference will now be made in detail to implementations of the example embodiments as illustrated in the accompanying drawings. The same reference indicators will be used throughout the drawings and the following description to refer to the same or like items.
• In the interest of clarity, not all of the routine features of the implementations described herein are shown and described. It will, of course, be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with application- and business-related constraints, and that these specific goals will vary from one implementation to another and from one developer to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of engineering for those of ordinary skill in the art having the benefit of this disclosure.
• In general, a variable stiffness surgical guidewire system for use with a flexible catheter, the system includes an elongated flexible guidewire and an actuator (also referred to as tool) selectively coupleable to the proximal end of the flexible guidewire for selectively controlling the stiffness of, at least, sections thereof. The system can be used in, for example, medical techniques for treating systems including vascular, urinary, genital, gastro-intestinal, respiratory, biliary, and neurological systems. Preferably, the system may also include a removable device to selectively maintain guidewire stiffness by maintaining tension after removal of the tool.
• FIG. 2A illustrates aguidewire100 in accordance with an embodiment for use during a surgical procedure. As shown inFIG. 2A, theguidewire100 is shown inside the aorta A of a patient, wherein theguidewire100 is inserted through aproximal opening12 of acatheter14 and extends out of a distal opening orlumen16 of thecatheter14. In contrast to theguidewire10 inFIG. 1, theguidewire100 inFIG. 2A includes atension wire102 at its proximal end as well astension head104 which is exposed and may be manipulated by the user.
• Thetension head104 is movable with respect to thebody106 of theguidewire102. Theguidewire100 has a variable stiffness feature in which the stiffness of theguidewire100 varies proportionally with the distance between thetension head104 and thecoil body106. Therefore, in operation, the stiffness a portion or all of theguidewire100 will increase as thetension head104 is moved away from thebody106. In contrast, movement of thetension head104 in the opposite direction (toward the body106) will cause the stiffness of theguidewire100 to decrease. Maintaining the position of thetension head104 with respect to thebody106 at a particular position will maintain the stiffness of theguidewire body106. In particular, the construction of theguidewire100, as will be discussed in more detail below, allows the distal end of theguidewire100 to remain stationary while the stiffness of the guidewire is increased.
• FIG. 2B illustrates a perspective view of the proximal end of theguidewire100 in accordance with an embodiment. As shown inFIG. 2B, theguidewire100 includes acoil body106, atension wire102 coupled to thebody106 extendable out of thebody106, and atension head104 coupled to thetension wire102. In addition, theguidewire100 is shown inFIG. 2B to preferably have acollar108′ which represents a portion of the end of thecoil body104 that is closest to thetension head104.
• In an embodiment, thecollar108′ is formed by soldering and metal flowing together 3-5 windings of the coil at the proximal end of thecoil body wire106. Thereafter, it is preferred that the soldered area is grounded and smoothed to create a smooth outer circular body with aflat collar end108 which is perpendicular to theouter surface108 of the collar in accordance with an embodiment. Theguidewire100 benefits from construction of thecollar108′ as thecollar108′ serves to increase the structural stability as well as the ability to bear tension (and resulting increased stiffness) enabled by soldering the end coils together. Thecollar108′ also serves as a retaining wall which allows the windings of the guidewire to contract and press against one another when the stiffness of theguidewire100 is increased. It should be noted that soldering and metal flowing is one example of creating thecollar108′ and that any other appropriate method is contemplated. It is also contemplated that theguidewire100 not use acollar108′ but some other member which serves the functions of a retaining wall that allows the coil windings of theguidewire100 to contract press together when an increase in stiffness of theguidewire100 is desired.
• FIG. 2C illustrates a side view of the distal end of the guidewire body in accordance with an embodiment.FIG. 2D illustrates an end view of the distal end of the guidewire body in accordance with an embodiment. As shown inFIGS. 2B and 2C, thetension wire102 preferably is comprised of one or more wires which are wound together to form a coiled or cable type body, whereby the coils of thetension wire102 are opposite to the coils of theouter body106. Thetension wire102 has a proximal end and a distal end, whereby the proximal end of thewire102 is attached to thetension head104 as shown inFIG. 2B. In an embodiment, thetension head104 is separately manufactured from thetension wire102 such that both components are coupled to one another. In an embodiment, thetension wire102 is formed with thetension head104 being integrally formed therewith.
• The distal end of thetension wire102 is attached to thedistal end109 of thebody106 of theguidewire100. As shown inFIGS. 2C and 2D, the distal end of thewire102 is positioned at thedistal end109′ of theguidewire100, whereby theouter body106 is preferably crimped to securely mount thetension wire102 to theouter body106. In particular, as shown inFIG. 2D, the crimpedareas111 force thebody106 to apply a frictional force onto thetension wire102, thereby allowing thewire102 and thebody106 to withstand more tension force during stiffening of theguidewire100 than previous soldering methods. Once the ends ofwire102 andouter body106 are crimped, thedistal end109 is preferably smoothed by known methods (e.g. soldering, machining) to form a smooth, roundeddistal end109 of theguidewire100. In the embodiment shown inFIG. 2D, an 8-point micro-crimp style tool may be used to crimp theouter body106 to thetension head102, it should be noted that any other appropriate tool may be utilized.
• As stated above, the coil windings of thetension wire102 are opposite to that of theouter body106 of theguidewire100. In an embodiment, the coil windings of theouter body106 traverse clockwise along the length of thebody106, whereas the coil windings of thetension wire102 traverse counterclockwise along the length of thewire102, or vice versa. The opposite windings of the two members allow the distal end of theguidewire100 to maintain its dimensional stability while theguidewire100 is stiffened and under tension. Additionally, the opposed windings allow the distal end of theguidewire100 to maintain its location with respect to its proximal end while under tension. Further, the method of crimping the ends of thetension wire102 andouter body106 allows tension to be applied-to and released-from theguidewire100 multiple times without crushing or damaging theouter body106. Accordingly, the preferred design of theguidewire100 discussed above specifically minimizes or avoidsdistal tip109 deflection as well as any tendency for the distal portion of theguidewire100 to straighten itself out with respect to the proximal end. By allowing thedistal portion109 to maintain its position while theguidewire100 is stiffened, the user is provided the positional stability to deliver the necessary surgical instruments and/or medicine to be delivered more consistently and accurately to the desired location within the patient. It should be noted that the other figures herein depicting theguidewire100 may not show thecoiled tension wire102 for clarity purposes.
• An example of the construction forguidewire100 is as follows: thebody106 has an outer diameter of .035″×.007″ of304 sst wire×150 cm-300 cm long coil body. Additionally, 5-10 coils located at the proximal end of theouter body106 are soldered together and polished or grounded to form thecollar108′ andcollar end108. With the outer diameter of thecollar108′ preferably having the same outer diameter as the outer diameter of thecoil body106, and theinner diameter103 of thecollar108′ having a slightly larger diameter than the outer diameter of thetensioning wire102, whereby theouter body106 moves freely over thetension wire102. One example of anacceptable tension wire102 has a .015″ outer diameter304 sst monofilament tension core which provides excellent tensile strength (approximately 70 lbs.) and acceptable stiffness.
• A preferred example of thetension wire102 is a cable-braid wire which provides excellent tensional strength and stiffness and superior positional stability of the distal end of theguidewire100 when under tension. In an embodiment, left hand or right hand wound coiled bodies of theguidewire100 are acceptable for use with left hand or right hand twist cables or monofilament core wires. The oppositely configured outer coil body and tension wire are such that the user experiences improved torsional stability when theguidewire100 is tensioned to a desired stiffness. This configuration may be more favorable than others for certain applications requiring, namely, additional torsional strength and dimensional stability during the procedures.
• Referring back toFIG. 2B, thetension wire102 andhead104 are shown a distance away from thecollar108 andbody106 in a default natural state. Theguidewire100 is designed such that thebody106 will increase in stiffness as the head104 (and wire102) is further actuated away from thecollar108. In contrast, thebody106 will decrease in stiffness as the tension head104 (and wire102) is moved toward thecollar108 of thebody106.
• As stated, it is preferred that thehead104 is positioned a certain distance from the collar in a default nature state, whereby a portion of thewire102 remains exposed outside thecollar108. Alternatively, thehead104 abuts thecollar108 and thewire102 is completely within thebody106 when theguidewire100 is in the default, natural state. For purposes of this description, it will be assumed that thehead104 is positioned a certain distance from thecollar108 and a portion of thewire102 is exposed, as shown inFIG. 2B, when theguidewire100 is at its default natural state.
• As shown inFIG. 2A, thebody106 has a diameter D, whereby thetension wire102 has a diameter d_w, and thetension head104 has a width dimension w_h. The diameter d_wof thetension wire102 is preferably smaller than the diameter D of thebody106. Additionally, it is preferred that the width w_hof thetension head104 is greater than the diameter d_wof thetension wire102 but preferably smaller than the diameter D of thebody106. Considering that the inner diameter of the instrument or drug carrying catheter is slightly larger than the diameter D of the body, a smaller width dimension w_hof thetension head104 will ensure that the medical instruments and drug may be loaded or unloaded directly over thehead104 of theguidewire100 without problems or resistance.
• It should be noted that thetension head104 is shown inFIG. 2B to have a triangular shape. Although this is a preferred shape, thetension head104 may alternatively have any other shape including, but not limited to, square, hexagonal, pentagonal, trapezoidal, spherical, circular, etc. Considering that thehead104 is shown as triangular in the embodiment inFIG. 2A, the width dimension w_his the length of a longest side (or any side if thehead104 is an equilateral triangle). In an embodiment that thehead104 is another shape, the width dimension w_his preferably the length of the longest side of the shape.
• FIG. 3A illustrates a diagram of a guidewire tensioning tool in accordance with an embodiment. As shown inFIG. 3A, thetool200 includes a body having afirst portion202A and asecond portion202B, whereby each portion has a pair ofrespective jaws204A,204B and a pair ofrespective handles206A,206B coupled to one another at afulcrum208. A spring-like member210 is preferably coupled to bothsides202A,202B. The spring-like member210 preferably applies an inwardly directed force F_s(as shown by the arrows) which urges thehandles206A,206B to move toward each other and thereby urging thejaws204A,202B to move apart from one another by default. It should be noted that although aregular spring210 is shown in the Figures of thetool200, it is contemplated that any type of resilient material may be used in substitution to a typical spring, including but not limited to, a leaf spring, foam, elastics, etc.
• Thejaws204A,204B are configured to receive and engage thetension head104 of theguidewire100. In particular, controlled movement of thejaws204A,204B toward or away from one another will result in the corresponding stiffness or flaccidness of theguidewire body106. As will be discussed, thejaw204B preferably includes a guidewire engagement feature which allows the jaw to engage thetension head104 during operation. Some example embodiments of the guidewire engagement feature will now be described inFIGS. 4A-4D.
• FIG. 4A illustrates a detailed view of the guidewire engagement feature in accordance with an embodiment. As shown inFIG. 4A, thetool200 hasjaws204A and204B, wherebyjaw204A will be referred to as thedistal jaw204A andjaw204B will be referred to as theproximal jaw204B. Thedistal jaw204A shown inFIG. 4A has anopen fork aperture218 which allows thewire102 to vertically slip downward into theaperture218 from the top surface of thejaw204A. In an embodiment, thejaw204A has aflanged portion207 is maintains the position of thecollar108 and prevents it from moving vertically upward the top surface of thejaw204A and disengaging from thejaw204A. The aperture's218 cross-sectional dimension is preferably smaller than the diameter of thecollar108 such that thecollar108 remains to theoutside surface220 of thedistal jaw204A. In an embodiment, the cross sectional dimension of theaperture218 is constant from theoutside surface220 to theinside surface222 of thedistal jaw204A. In an embodiment, as shown inFIG. 4D, the cross sectional dimension of theaperture218 is not constant from theoutside surface220 to theinside surface222, but instead has a recessedportion224 which allows the collar to sit within a portion of thedistal jaw204A. In an embodiment, theaperture218 has a tapered shape in which the size of the aperture is larger near theoutside surface220 than theinside surface222.
• FIGS. 4B and 4C illustrate different types of jaw configurations. InFIG. 4B, theproximal jaw204B has a open-ended fork arrangement, such as a pliers beak, as with thedistal jaw204A. Theflange205′ of theproximal jaw204B prevents thehead104 from vertically running upward and disengaging from thejaw204B.FIG. 4C illustrates the distal jaw having a taperedflange207′ design which also maintains thecollar108 again the outer surface of thejaw204A.
• Additionally, theproximal jaw204B preferably includes an engagingaperture230 therethrough which has a cross-sectional dimension large enough to allow thetension head104 to extend through, whereby thetension head104 engages theouter surface228 when inserted through the engagingaperture230 from theinner surface226 to theouter surface228. However, once thetension head104 passes through the engagingaperture230, theaperture230 is selectively engaged with thetool220, whereby thehead104 is unable to pass through theaperture230 back toward thecollar body108 until desired by the user.
• FIGS. 5A-5C illustrates perspective views of the guidewire engaging feature of thetool200 in accordance with an embodiment. It should be noted that although the engaging feature is described within the context of thetool200, the engaging feature may be incorporated in any other of other devices described herein (e.g. tools1200,1400,1500 discussed below). As stated above, thetension head104 preferably has a triangular shape in an embodiment. Similarly, in an embodiment, the engagingaperture230 has a similar triangular shaped passage through the entire thickness of theproximal jaw204B and/or thedistal jaw204A, as shown by the phantom lines inFIG. 5A. InFIG. 5A, thetriangular head104 is shown passing through theaperture230 from theinner surface226 to theouter surface228 of thejaw204B, whereby the shape of thehead104 is in communication and registers with the corresponding shape of theaperture230. As such, the dimensions of theaperture230 are at least slightly larger than the dimensions of thehead104 to allow thehead104 to traverse through theaperture230. InFIG. 5B, thehead104 traverses entirely through theaperture230 and is rotated about axis A, as shown by the arrows, to allow thehead104 to be engaged with atool200,1200 as discussed below. In an embodiment, thehead104 does not rotate, but instead thejaw204B is rotated to bring the combination to the configuration inFIG. 5C.
• InFIG. 5C, thehead104 is rotated 60 degrees out of alignment with theaperture230, whereby thehead104 is then urged into frictional contact with theouter surface228 of thejaw204B by theguidewire body106. By being in frictional contact with theouter surface228 of thejaw204B, thehead104 is thereby engaged and in a locked position with thejaw204B. To unlock and disengage thehead104 from thetool200, thehead104 is rotated 60 degrees about axis A until it is aligned with theaperture230, as shown inFIG. 5A.
• FIG. 6A illustrates a perspective view of the guidewire engaging feature of thetool200 in accordance with an embodiment. It should be noted that although the engaging feature is described within the context of thetool200, the engaging feature may be incorporated in any of the other devices described herein (e.g. tools1200,1400,1500). In an embodiment, theaperture230′ includes a recessedportion232 which is 60 degrees out of alignment with theaperture230′ such that thehead104 is securely seated within the recessedportion232 when in the locked and engaged position. The recessedportion232 secures thehead104 and prevents thehead104 from unintentionally rotating when engaged by thejaw204B′ or any of the other devices described herein (e.g. tools1200,1400,1500).FIG. 6B illustrates a cross sectional view of theaperture230′ along section B-B in accordance with an embodiment.
• FIG. 6C illustrates an alternate cross sectional view of theaperture232′ in which the recess tapers outward toward theouter surface230′. In the embodiment inFIG. 6C, the rounded tapered shapedrecess232′ facilitates easier interfacing and engaging as well as disengaging of thetriangular head104 from theaperture232′.
• Once thehead104 is engaged and in a locked position with thetool200, theguidewire100 is then able to be manipulated using the tool. Referring back to the tool embodiment shown inFIG. 3A, thetool200 includes astiffness adjustment mechanism212 which serves to provide an equal and opposing force to thespring210 to stabilize mechanical movement of thejaws204A,204B. The embodiment of theadjustment mechanism212 shown inFIG. 3A comprises anut216 and one ormore bolts214A,214B which are coupled to thetool200 in the embodiment shown inFIG. 3A. Theadjustment mechanism212 operates by rotation of one or both of the nuts214A,214B in predetermined directions which thereby causes thebolt216 to move transversely in the desired direction (as shown by the arrow). For example, rotation of thenut214A and/or214B in a predetermined direction will cause thenut216 to move toward thefulcrum208 and eventually abuts themiddle body218 of thetool200. Considering that the spring likemember210 urges thehandles206A,206B toward one another (and thus thejaws204A,204B away from each other), thebolt216, upon applying a counter force to themiddle body218, will causehandles206A and206B to move away from one another and ultimately force thejaws204A,204B of the tool to move closer to one another. Considering that the stiffness of the engaged guidewire100 increases as thejaws204A,204B are moved apart from one another, theadjustment mechanism212, by default or when not in use, presses against themiddle body218 and causes thehandles206A,206B to be apart from one another a maximum allowable distance. This allows thetool200 to allow easy manipulation of theguidewire100.FIG. 3B illustrates the preferred default position of thetool200 in accordance with an embodiment.
• In operation, upon thehead104 of theguidewire100 being engaged by thetool200, the user is able to manipulate theadjustment mechanism212 by pressing thehandles206A,206B toward each other and thereby moving thejaws204A,204B away from one another. The gradual movement of thejaw204B away fromjaw204A forces thetension head104 away from thecollar108 and thus gradually increases the stiffness of theguidewire100 to a desired amount. In an embodiment, thetool200 may include a caliper type measuring feature which allows the user to know the amount of stiffness theguidewire100 is undergoing based on the measured distance between thejaws204A,204B (FIG. 10).
• FIG. 7 illustrates a diagram of a tool in accordance with an embodiment. As shown inFIG. 7, thetool300 is similar in design and operation to thetool200 described inFIGS. 3A and 3B. In contrast to thetool200, thetool300 includes a hard stop mechanism312 configured to provide one or more fixed stops, whereby each stop represents a predetermined distance betweenjaws304A and304B. The stop312 shown inFIG. 7 is preferably fixed and defines the maximum distance (and thus maximum stiffness in the guidewire100) whichjaws304A,304B may be apart from one another when thetension head104 is engaged thereto. In operation, middle body318 is shaped such that it comes into contact with the stop312 and thus does not allowhandles302A,302B to be pressed toward one another any further. In operation, the hard stop mechanism312 allows theguidewire100 to achieve three levels of stiffness: soft or no stiffness when theguidewire100 is not engaged to thetool300, intermediate stiffness when theguidewire100 is engaged to thetool300 but thehandles302A,302B are not pressed together, and maximum stiffness when theguidewire100 is engaged to thetool300 and the middle body318 is pressing against the hard stop312.
• FIG. 8 illustrates a diagram of a tool in accordance with an embodiment. As shown inFIG. 8, the tool400 is similar in design and operation to thetool200 described inFIGS. 3A and 3B. In contrast to thetool200 inFIGS. 3A and 3B, the tool400 includes anadjustment mechanism412 having a cam414 configured to rotate about acam axle416 and which includes one or more cam surfaces418 which bear against the middle body420 to move the jaws404A,404B toward or away from each other a predetermined distance. In particular, the cam414 shown inFIG. 8 includes threecam surfaces418A,418B, and418C, the cam surfaces having respective radii, r₁, r₂, r₃with respect to thecam axle416. It should be noted that any number of cam surfaces418, including just one, is contemplated. In the embodiment shown inFIG. 8, the three radii of the cam surfaces418A,418B, and418C are related as follows: distance of r₁to axle<distance of r₂to axle<distance of r₃to axle. Considering that the spring410 urges the handles402A and404B toward one another, the cam414 applies a force to the middle body which opposes the spring force F_S. Thus, if the cam414 is actuated such thatcam surface418A having the largest radius, r₃, is in contact with the middle body, the cam414 will force the handles402A,402B to move away from one another the greatest distance. This results in the jaws404A,404B being moved toward each other. In contrast, as the cam414 is actuated to a position where thecam surface418A having the smallest of the available radii, r₁, is in contact with the middle body, the cam414 will force the handles402A,402B to move toward one another. This results in the jaws404A,404B moving away from one another tool400, thereby effectively increasing the stiffness in theguidewire100.
• FIG. 9 illustrates a diagram of a tool in accordance with an embodiment. As shown inFIG. 9, thetool500 is similar in design and operation to thetool200 described inFIGS. 3A and 3B. In contrast to thetool200 inFIGS. 3A and 3B, thetool500 includes anadjustment mechanism512 having a detent assembly which functions, somewhat analogously to a torque wrench, for allowing the selection of maximum applied tension. The detent setting may be set to a specific force (much like a torque wrench) such that once the designated force to the tool handle exceeds the desired level, thedetent mechanism512 activates and prevents further tensioning of the guidewire. Thedetent mechanism512 thus can act as a form of a “safety” against over tensioning the guidewire.
• FIG. 11 illustrates a perspective view of a guidewire insert or cartridge in accordance with an embodiment. As shown inFIG. 11, the cartridge (also referred to herein as an insert)600 is positioned between thehead104 and thecollar108 of theguidewire body106, whereby thecartridge600 maintains the stiffness in theguidewire100 by maintaining thehead104 at a desired distance from thecollar108. In particular, thecartridge600 has a cylindrical body having aproximal end602 which abuts aninner surface105 of theguidewire head104 and adistal end604 which abuts the guidewire'scollar108. In addition, thecartridge600 has aninner diameter606 substantially equal or slightly larger than the diameter of the guidewire'stension wire102. The cross-section of the cartridge is preferably in the shape of a trapezoid as shown inFIG. 11, although other shapes are contemplated (e.g. C-shaped, square, triangular, etc.) With regard to the embodiment inFIG. 11, the trapezoidal cross-section of the cartridge produces two opposingsides603 as well as twoadjacent faces601. The opposingsides603 allow the cartridge to be easily grasped by an engagement tool (discussed below) whereas the adjacent faces601 allow the cartridge to be easily disengaged by the disengaging tool (discussed below). The adjacent faces601 preferably encompass210 degrees of thewire102, although other angles are contemplated. This configuration (shown inFIGS. 20-22B) allows the disengaging tool to push thefaces601 downward to slightly increase thediameter606 of thecartridge600 to disengage thecartridge600 from thetension wire102.
• Thecartridge600 may be constructed of a durable, rigid, yet slightly flexible material having a high longitudinal compressive strength (e.g. Lexan, Plexiglas, Lucite, Perspex) so that thecartridge600 can flex open and snap into circumferential position over thecore wire102 and later spring open when it is pushed “away” from thecore wire102 so as to permit removal of thecartridge600.
• It is preferred that thecartridge600 is smaller than or equal to the diameter of the guidewire'sbody106 as well as the cross section of the lumen of the instrument or drug carrying catheters with which theguidewire100 operates. Accordingly, thecartridge600 allows the user the freedom to load, unload, advance and retract surgical devices over the proximal end of the guidewire andcartridge600 while the desired stiffness of theguidewire100 is maintained without compromising the stiffness of theguidewire100 and without removing thecartridge600. Thus, the configuration and dimensions of thecartridge600 allows the tension of theguidewire100 to be maintained while the exchange of catheters, balloons, stents and/or other surgical tools and medicine may occur over theguidewire100 without having to remove thecartridge600 or exchange guidewires.
• FIGS.12 and13A-13D illustrate perspective views of a selectivelyopenable guidewire insert800 in accordance with an embodiment. As shown, theinsert800 is positioned between thehead104 and thecollar108 of theguidewire body106, whereby theinsert800 maintains the stiffness in theguidewire100 by maintaining thehead104 at a desired distance (and desired tension) from thecollar108. In particular, theinsert800 has a cylindrical body having aproximal end808 which abuts theguidewire head104 and adistal end810 which abuts the guidewire'scollar108 when theinsert800 is coupled to thetension wire102. In addition, as shown inFIG. 13A, theinsert800 has aninner diameter812 as well as an outer diameter814, whereby theinner diameter812 is substantially equal or slightly larger than the diameter of the guidewire'stension wire102. It is preferred that the outer diameter814 of theinsert800 is smaller than or equal to the diameter of the guidewire'sbody106. Further, it is preferred that the overall outer diameter of theinsert800 is smaller in cross section than the lumen of the surgical components with which theguidewire100 operates. Accordingly, theinsert800 allows the user the freedom to load, unload, advance and retract surgical devices over the proximal end of the guidewire and insert800 while the desired stiffness of theguidewire100 is maintained.
• As shown inFIG. 12, theinsert800 has a clam-shell configuration having alower portion802 and anupper portion804 coupled to one another at ahinge806. Thehinge806 may be created as an integral score in the insert's800 material. This configuration allows theinsert800 to be applied over theextended wire102 in an open position (as shown inFIG. 12) and then actuated or snapped to a locked position by closing the clam shell configuration around theextended wire102. The material of theinsert800 is durable and rigid to force thehead104 from thecollar108 and thus maintain stiffness in theguidewire100.
• In operation, after thetool200 moves the head104 a desired distance with respect to thecollar108 to achieve the desired amount of stiffness, the clamshell-like insert800 is applied and secured around thetension wire102 to maintain the increased guidewire stiffness after thetool200 is removed. As discussed below, the upper and lower portions of theinsert800 may be completely separated from one another prior to and/or after theinsert800 is coupled to thetension wire102.
• FIG. 13A illustrates theclamshell insert800 having a snap-fit configuration in which theupper portion804 includes one or moremale protrusions818 and thelower portion802 includes one or morefemale receivers816 which receive themale protrusions818 to lock theinsert800 in the closed position. It should be noted that the snap-fit configuration shown inFIG. 13A is an example only and other appropriate locking mechanisms are contemplated. For example, the lower andupper portions802,804 may be maintained in the closed position by magnets, screws, etc. In addition, theinsert800 may be made of any appropriate material which maintains thehead104 at the desired distance from thecollar108. For example, theinsert800 may be made of durable plastic, stainless steel, aluminum, composite alloys, etc.Inserts800 of different length may be provided to sustain various amounts of stiffness in theguidewire100. In an embodiment, theinsert800 may be stamped to have stiffness information on its outer surface to easily inform the user as to how much tension theguidewire100 will experience upon theinsert800 being applied thereto. In an embodiment, theinsert800 may be disposable and of one-time use, although theinsert800 may alternatively be reused. It should be noted that the above-described design of theinsert800 facilitates fast, simple placement and removal.
• FIG. 13B illustrates an embodiment in that theinsert800 is shown almost closed over thetension wire102. As shown inFIG. 13B, theinsert800 includes anopening820 along which extends from one end to the opposite end of the body, whereby the opening remains even after theinsert800 is actuated to the closed position. Theopening820 allows a corresponding tool to remove the insert from thetension wire104 by pulling the portions adjacent to theopening820 apart enough to increase the width of theopening820. Upon width of theopening820 being large enough, theinsert800 will then be able to be easily removed fromtension wire102. This allows the user to quickly remove theinsert800 to adjust the stiffness of theguidewire100. It should be noted that the above-described design of theinsert800 facilitates fast, simple placement and removal.
• FIG. 13D illustrates a perspective view of a guidewire with combinable cartridges in accordance with an embodiment. As shown inFIG. 13D, theguidewire100 includes anindex groove110 located on thecollar108. In addition, thetension head104 is shown to include anindex ridge112, whereby theridge112 is configured to fit completely intoindex groove110 when thetension head104 abuts thecollar108 when theguidewire100 is in a relaxes natural state.
• In the embodiment inFIG. 13D, one or more cartridges822 are shown coupled to theguidewire100 whereby the cartridges are shown consecutively linked to one another to maintain a specified tension in theguidewire100. In particular, cartridge to822A and cartridge822B are coupled to one another and positioned end to end between thetension head104 and thecollar108 of theguidewire100. As shown inFIG. 13D,cartridge822A includes a cartridge groove ordetent824A on the end proximal to thetension head104 and a cartridge ridge orprotrusion826A on the opposite end. Similarly, cartridge822B includes acartridge groove824B on the end which abuts thecartridge ridge826A ofcartridge822A and acartridge ridge826B on its opposite end, whereby thecartridge ridge826B fits within theindex groove110 of theguidewire100. It should be noted that theindex ridge112 and index groove110 of theguidewire100 are not required to utilize the consecutive cartridges having the indexed ridges and grooves. It should also be noted that although two cartridges you shown inFIG. 13D, any number of cartridges may be used with the guidewire. It is also contemplated that any cartridge may have the same features (ridges and/or grooves) on both ends. It should also be noted that the groove and/or ridge features may be applied to any of the other inserts discussed herein and is not limited to only the figures which show them.
• Cartridges822A,822B each have a length dimension such that theguidewire100 will undergo a certain amount of stiffness when only one cartridge is used. However, as shown inFIG. 13D, theguidewire100 will undergo additional stiffness when both cartridges are combined serially and placed over thetension wire102 of theguidewire100. This allows the user to variably adjust the amount of stiffness desired on theguidewire100 by adding or removing cartridges822 during the procedure. In an embodiment, the cartridges are of equal length, although the cartridges may be of varying lengths in an embodiment. In an embodiment, each cartridge may be marked, or color-coded, with a value which represents the amount of tension which theguidewire100 would undergo when that particular cartridge is coupled to theguidewire100. In a further embodiment, these values may be combined to provide a combined tension value which represents the amount of tension which theguidewire100 would undergo when those combined cartridges are coupled to theguidewire100. As with the other cartridges described herein, the cartridges inFIG. 13D preferably have an outer diameter smaller than or equal to the outer diameter of theguidewire body106 to allow ease of loading and unloading of instrument and drug catheters without compromising stiffness in theguidewire100.
• FIG. 14 illustrates a perspective view of an insert placement tool in accordance with an embodiment. As stated above, the upper and lower portions of the insert800 (FIG. 12) may be completely separated from one another prior to and/or after theinsert800 is coupled to thetension wire102. In other words, the upper804 andlower portions802 of the insert800 (FIG. 12) may be separate pieces which are not attached at a moveable hinge, but instead include an attachment means which allow theportions802,804 to be attached together when coupled to thetension wire102 and completely disattached from one another when not coupled to thetension wire102. Such an attachment means may be snap features, magnets, screws, tacks, etc.
• InFIG. 14, theinsert placement tool900 is utilized to couple and/or remove the upper andlower portions804,802 with respect to thetension wire102. Thetool900 includes anupper clasp902 and alower clasp904 which are moveable with respect to one another about the joint906. A pair ofhandles908A,908B are coupled to the joint906 and are moveable to selectively operate theclasps902,904 to move toward and away from one another.
• In an embodiment, theclaspers902,904 have a length dimension which is smaller than the length of the upper andlower portions802,804 of theinsert800. This allows theclaspers902,904 to be placed between thejaws204A,204B of the extender tool200 (FIG. 3A) to deliver theinsert800 to thetension wire102 while thehead104 is extended away from the guidewire'scollar108. Once theclaspers902,904 are placed over thetension wire102, the user preferably actuate thehandles908A,908B toward one another to couple the upper andlower portions802,804 of thecartridge800 to one another and around thetension wire102. Theinsertion tool900 thereby “snaps” theinsert800 over thetension wire102 and thetool900 is then removed from between the tool's jaws. In an embodiment, theclaspers902,904 do not deliver theinsert800, but instead are themselves placed between thetension head104 and thecollar108 to maintain the stiffness of the guidewire after thetool200 is removed.
• FIG. 15 illustrates a perspective view of self-maintainingguidewire1000 in accordance with an embodiment. As shown inFIG. 15, theguidewire1000 includes an aperture1010 (shown in phantom lines) through thetension wire1002. Although only one aperture1010 is shown inFIG. 15, any number of apertures1010 may be configured along thetension wire1002. The aperture1010 is configured to receive asetting pin1012 therethrough, whereby theguidewire1000 is able to maintain the desired stiffness when thesetting pin1012, inserted in the desired aperture1010, abuts thecollar1008. It is preferred that apertures1010 are configured in a spaced fashion such that thepin1012 may be inserted into any of the available apertures1010 which correspond to the desired stiffness which the user wants theguidewire1000 to achieve.
• FIG. 16 illustrates a perspective view of self-maintainingguidewire1100 in accordance with an embodiment. As shown inFIG. 16, theguidewire1100 includes afoot1110 which is configured within acorresponding recess1112 within thetension wire100. Thefoot1110 is preferably urged upward away from thewire1102 by a spring1114, such that thefoot1110 “pops out” when it is extended out from within thebody1106 past thecollar1108. In operation, once thetension wire1102 is extended far enough from theguidewire body1106, thefoot1100 springs out from therecess1112 and abuts thecollar1108 to maintain the position and tension of theguidewire1100. In an embodiment, thetension wire1102 can be retracted and the guidewire relaxed by pressing thefoot1100 back into therecess1112 using a tool (e.g. hemostat) and allowing thetension head1104 to retreat back toward the default position.
• FIG. 17A illustrates a side view of a combined tensioning and insert applicator tool in accordance with an embodiment. In particular, thetool1200 includes ahandle member1202, atrigger member1204, anelongated tray1206, acollar interface1210, and atension brace1212. In an embodiment, thehandle member1202 is designed to have a pistol grip and an elongated trigger member as shown inFIG. 17A, however any other appropriate shape for thehandle1202 andtrigger member1204 is contemplated.
• Aproximal end1208 of theelongated tray1206 is mechanically and operably coupled to thehandle1202 and thetrigger1204. The distal end of thetray1206 terminates with acollar interface1210 which is configured to abut thecollar108 of theguidewire body106 when thetool1200 is in operation. Thecollar interface1210 preferably includes a notch1216 (FIG. 18) through which thetension wire102 passes while thetool1200 is operating with theguidewire100. Theelongated tray1206 in the embodiment shown inFIG. 17A has an open top in which thetension brace1212 is exposed. This embodiment allows the user to view the tensioning of the guidewire and as well as movement of thetension brace1212 along theelongated tray1206.
• In contrast,FIG. 17B illustrates anelongated barrel tray1206′ which it is closed, whereby the interior of the tray cannot be viewed by theuser1206′. As shown inFIG. 17B, thebarrel tray1206′ has anotch feature1216′, preferably triangular in cross-section, on its distal end which receives the tension wire as well as the tension head and through which thetension wire102 passes while the tool is operating with theguidewire100.
• Thetool1200 shown in the embodiment inFIG. 17A also includes atension brace1212 which is adjustably moveable along theelongated tray1206 between the tray's1206 proximal anddistal ends1208,1210. In particular, thetension brace1212 is configured to retract toward theproximal end1208 as thetrigger1204 is squeezed. In an embodiment, thetension brace1212 freely moves along thetray1206 in response to actuation of thetrigger1204. In an embodiment, thetension brace1212 is urged toward thedistal end1210 byspring1215. In this embodiment, arod1217 is coupled at one end to a rotating cam of thetrigger1204 and another end is coupled to thebrace1212, whereby actuation of thetrigger1204 overcomes the forces on thetension brace1212 by thespring1215 to move thetension brace1212 toward theproximal end1208.
• In an embodiment, thenotch feature1216 is configured to receive a portion of thetension wire102 therethrough along with thetension head104 when thetension brace1212. Thetension brace1212 is preferably positioned proximal to thecollar rest1210 and has atension head104 engaging aperture. In an embodiment, thetension brace1212 has the head engaging aperture as described above inFIGS. 5A-5C or6A-6C, and the details of the engaging apertures are not discussed again herein. It should be noted that other configurations of head engaging apertures are contemplated.
• In the embodiment inFIG. 17A, thetool1200 includes amagazine1214 configured to house one or more of the cartridge inserts described above. Themagazine1214 is shown preferably coupled to and positioned below theelongated tray1206, although it is contemplated that the magazine may be positioned above or to the side of theelongated tray1206.FIG. 20 illustrates an broken view of an interior of thecartridge magazine1214 in accordance with an embodiment. In general, thecartridge magazine1214 preferably houses the cartridge prior to coupling the cartridge to thetension wire102 of theguidewire100. In an embodiment, thecartridge magazine1214 additionally or alternately retrieves and stores the cartridge after the cartridge has been coupled to thetension wire102. As shown inFIG. 19, themagazine1214 preferably includes alifter mechanism1220 positioned within themagazine1214 along with acartridge inserter1222 which is coupled to thelifter mechanism1220.
• As shown inFIGS. 19-21, thelifter mechanism1220 preferably comprises one or more sets ofscissor members1228 which are coupled to one another about an axis, whereby eachscissor member1228 includes aroller1232 on its end. Thescissor members1228 preferably move along a receiving groove along thebottom surface1234 of themagazine1214 such that therollers1232 move along only one dimension within themagazine1214. Alternatively, thescissor members1228 move along a smooth surface within thebottom surface1234 of themagazine1214. In operation, therollers1232 move along thebottom surface1234 toward one another to cause the lifter mechanism to move upward toward thetray1206. In an embodiment, thelifter mechanism1220 preferably urges thecartridge inserter1222 to move in an upward direction by the use of a spring. In another embodiment, a separate actuating control (not shown) external to themagazine1214 is used to selectively cause thelifter mechanism1220 to move upward and/or downward with respect to thetray1206. Such an actuating control may be a mechanical and/or electronic switch, lever, button or other actuating means. In an embodiment, themagazine1214 is capable of easily being disengaged from thetool1200. This allows themagazine1214 to be reloaded with one or more cartridges, or be replaced with an already full magazine which is then coupled to thetool1200.
• As shown inFIGS. 20 and 21, thecartridge inserter1222 has a U-shaped configuration, whereby angled ends of theinserter1222 preferably come into contact thesides603 of the cartridge600 (SeeFIG. 11) and allow theinserter1222 to securely hold and move thecartridge600 to engage thewire102. Themagazine1214 is preferably positioned underneath theelongated tray1206, whereby thetray1206 includes anaperture1226 in communication with the interior of themagazine1214 as shown inFIG. 20. In an embodiment, theaperture1226 has a length dimension along theelongated tray1206 to allow specific sized cartridges to pass therethrough. In an embodiment, theaperture1226 has a length dimension which traverses the entire length of theelongated tray1206 to allow any sized cartridges to pass therethrough. Theaperture1226 allows thecartridge800 to be deployed within the magazine in an upward direction to come in contact with and couple to thetension wire102 as thetension wire102 is extended by thetension brace1212. In an embodiment, theaperture1226 constantly remains open in theelongated tray1206. In an embodiment, theaperture1226 has a door which selectively opens to allow the cartridge to be deployed around thetension wire102.
• In operation, as shown inFIG. 20, the user operates thetool1200 by placing thecollar rest1210 against thecollar108 of theguidewire100. Thetensioning head104 is inserted through thenotch feature1216 and is then engaged and locked with thetension brace1212. Thetension brace1212 may have any of the engaging apertures described above. The user then gradually applies force to thetrigger1204 to cause thetension brace1212 to gradually move from thecollar rest1210 toward thehandle1202. As thetension brace1212 moves toward the proximal end of thetray1206 thetensioning wire102 extends and thus causes the guidewire to increase in stiffness. Once thetension brace1212 moves away from the aperture1226 a desired distance, thelifter mechanism1220 preferably automatically actuates to cause thescissor members1228 to move toward one another and cause thecartridge holder1222 as well as acartridge600 to move upward through theaperture1226 and around thetension wire102. In an embodiment, the user operates a separate actuator mechanism to cause thelifter mechanism1220 to operate. Preferably, the quick upward movement of theinserter1222 andcartridge600 causes thecartridge600 to snap around thetension wire102, as shown inFIG. 21.
• As stated above, thecartridge600, once deployed, will maintain the tension of the guidewire. This allows the user to depress the trigger, which causes thetension brace1212 to move back toward the distal end of theelongated tray1206 and abut the end of thecartridge600. Thetension head104 is then disengaged from thetension brace1212. Thetool1200 is then preferably removed from theguidewire100 to allow surgical tools and/or drugs to be delivered along the tensioned guidewire via the guidewire's proximal end.
• FIG. 22A illustrates a side view of a combined tensioning as well as an cartridge applicator and removal tool in accordance with an embodiment. As with the tool discussed inFIGS. 17-21, thetool1300 includes ahandle member1302, atrigger member1304, a closed, barrel-shapedelongated tray1306, acollar interface1310, and atension brace1312. As with the embodiment inFIG. 17A, thehandle member1302 is designed to have a pistol grip and anelongated trigger member1304, although any other appropriate shape for thehandle1302 andtrigger member1304 is contemplated.
• As with the embodiment inFIG. 17A, thetool1300 includes amagazine1314 positioned below thebarrel tray1306 and is configured to deploy a cartridge around thetension wire102 of theguidewire100 when thetension head104 is extended a desired distance from thecollar interface1310. As with the embodiment inFIG. 17A, thebarrel tray1306 may include an aperture in its bottom surface which is in communication with the interior of themagazine1314. As stated above, themagazine1314, upon actuation, moves thecartridge600 upwards through the aperture in the bottom surface of thebarrel tray1306. Upon thecartridge600 coming in contact with thetension wire102, thecartridge600 couples to thetension wire102 to prevent thetension wire102 from reverting back to thecollar108 or the relaxed default position of theguidewire100.
• In the embodiment inFIG. 22A, thetool1300 also includes aremoval magazine1316 preferably positioned above thebarrel tray1306. Theremoval magazine1316 houses a removal mechanism that is configured to remove an already deployedcartridge600 from thetension wire102 when thecartridge600 is no longer needed. In an embodiment, theremoval magazine1316 is in communication with an aperture in the top surface of thebarrel tray1306 to allow thecartridge600 to be removed from thetray1306 and moved into theremoval magazine1316.
• In the embodiment inFIG. 22A, thelifter mechanism1318 preferably comprises one or more sets ofscissor members1320 which are coupled to one another about an axis. In an embodiment, eachscissor member1320 includes aroller1322 on its end. Thescissor members1320 preferably move along a receiving groove along the top surface1324 of themagazine1316 such that therollers1322 move along only one dimension within themagazine1316. Alternatively, thescissor members1320 move along a smooth surface of the top surface1324 of themagazine1316. In operation, therollers1322 move toward one another to cause the lifter mechanism to move downward toward thebarrel tray1306. In an embodiment, theremoval mechanism1318 preferably urges thecartridge remover1326 to move in a downward direction via a spring. In another embodiment, a separate actuating control (not shown) external to themagazine1316 is used to selectively operate theremoval mechanism1318 when the user desires. Such an actuating control may be a mechanical and/or electronic switch, lever, button or other actuating means.
• FIG. 22B illustrates an end view of thetool1300 withremoval mechanism1318 in accordance with an embodiment. Theinsert magazine1314 is not shown inFIG. 22B for clarity purposes. In an embodiment, thecartridge remover1326 has a similar cross-sectional shape to theinserter1222 shown inFIGS. 20 and 21 in which theremover1326 has a U-shaped configuration with angled ends. The ends of theremover1326 come into contact with the slightly angled faces601 ofcartridge600, whereby the pointed ends press against thefaces601, as shown inFIG. 22B. As the ends of theremover1326 press against thefaces601, the forces cause thefaces601 to the bend downward and outward with respect to theaperture606. Upon sufficient force being applied to thefaces601, the movement of thefaces601 away from one another causes the diameter of theaperture606 to slightly increase, thereby allowing thecartridge600 to slip off of thetension wire102, thereby disengaging thecartridge600 from thewire102.
• It should be noted that although an example is shown and described as to the construction of the removal mechanism, any appropriate construction which allows thecartridge remover1326 to move to thebarrel tray1306 and remove thecartridge800 is contemplated. It should be noted that although the figure shows two separate magazines, one for insertion and one for removal of the cartridge, is contemplated that one magazine may be used to perform both insertion and removal functions in an embodiment. It should also be noted that although thecartridge600 is discussed in relation with the embodiments inFIGS. 19-22B, any other shaped cartridge may be used as a substitute with appropriately modified inserter and/or remover devices.
• In an embodiment, themagazine1318 is capable of easily being disengaged from thetool1300. This allows one or more cartridges collected by the magazine to be unloaded from thetool1300. In an embodiment, the detaching feature allows a magazine full of used cartridges to be replaced with an empty removal magazine for continuing use. In an embodiment, theremoval magazine1318 includes one or more windows (not shown) to allow the user to view inside themagazine1318 and see the collected cartridges or an aperture for the ejection of spent or used cartridges.
• FIG. 23A illustrates a perspective view of a guidewire with integrated tension maintaining mechanism in accordance with an embodiment. As shown inFIG. 23A, theguidewire1400 preferably includes abody1406 having atension wire1402 and atension head1404 coupled to a proximal end of thetension wire1402.
• Thebody1406 has a diameter D, whereby thetension wire1402 has a diameter d_w, and thetension head1404 has a width dimension w_h. The diameter d_wof thetension wire1402 is preferably smaller than the diameter D of thebody1406. Additionally, it is preferred that the width w_hof thetension head1404 is greater than the diameter d_wof thetension wire1402 but preferably smaller than the diameter D of thebody1406. The smaller width dimension w_hof thetension head1404 allows the user to load and unload other surgical tools via thehead1404 and onto thecoil body1406 while simultaneously maintaining the desired stiffness of theguidewire1400.
• Thetension head1404 has an integratedtension maintaining mechanism1410 in which themechanism1410 includes one or more channels which are configured to house tensioning legs, as shown inFIG. 23A. In the embodiment shown inFIG. 23A, thetension maintaining mechanism1410 includeschannels1412,1414 and1416, each preferably located near the angles of thetriangular head1404, although placement of the channels can be anywhere on thehead1404. In an embodiment, thechannels1412,1414 and1416 extend entirely through the tension head, whereby one or more of thechannels1412,1414 and1416 have an aperture insurface1432 and opposingsurface1434. In an embodiment, thechannels1412,1414 and1416 only extend out ofsurface1434 of thetension head1404.
• Thechannels1412,1414 and1416 preferably houserespective tension legs1418,1420,1422 which are slidably moveable in and out of the channels in a linear direction. Each tension leg has a proximal end which preferably remains attached to thetension head1404 and a distal end which comes in contact and abuts thecollar1408 of theguidewire1400. When in the retracted mode, as withlegs1420,1422 inFIG. 23A, thelegs1420,1422 remain within theirrespective channels1420,1422 and preferably do not come into contact with thecollar1408. In contrast, when the leg is in the extended mode, as withtension leg1418, theleg1418 abuts thecollar1408 and forces thetension head1404 to remain positioned away from thecollar1408 to ensure that the guidewire maintains its desired stiffness. In an embodiment, it is contemplated that thecollar1408 may include one ormore detents1430 which are configured to receive the distal end of the respective tension leg. Thedetents1430 aid in stabilizing the tension leg in the extended position and prevent the tension leg from slipping off the surface of thecollar1408.
• In an embodiment in which themechanism1410 utilizes more than one tension leg, it is preferred that the tension legs have different length dimensions, although this is optional. As shown inFIG. 23A,tension leg1420 has a greater length dimension compared toleg1422, but a smaller length dimension thanleg1418. Considering that the stiffness of theguidewire1400 is directly proportional to the distance between thetension head1404 and thecollar1408, theguidewire1400 will experience greater stiffness whentension leg1418 is in the extended position than whentension leg1420 is in the extended position. In comparison, theguidewire1400 will experience less stiffness whentension leg1422 is in the extended position than whentension leg1420 is in the extended position. This allows the user to selectively choose which tension leg to utilize based on the desired stiffness of theguidewire1400.
• Thetension legs1418,1420,1422 are preferably attached to the channels at their proximal ends to prevent thelegs1418,1420,1422 from becoming disengaged from thetension head1404. Themechanism1410 is configured to ensure that the extended tension leg is able to withstand the forces which urge thetension head1404 to move toward thecollar1408. In an embodiment, a spring (not shown) within thetension head1404 urges the tension leg to the extended position, whereby the spring is rated with a constant k such that the spring force will be higher than any opposite force that urgeshead1404 andcollar1408 toward one another.
• In an embodiment,FIG. 23B, anactuator1424 which is attached toleg1418 protrudes out of anelongated aperture1426 in thetension head1404, whereby the user can slidably move theactuator1424 along anelongated aperture1426 to slide theleg1418 in or out of thehead1404. As shown inFIG. 23B, theelongated aperture1426 includes astop detent1428 in which theactuator1424 may be set to ensure that theleg1418 remains in the extended position to maintain the stiffness in theguidewire1400. In the example shown inFIG. 23B, thestop detent1428 is positioned at the end of thewindow1426 closest to thetension wire1402, although one or more intermediate stop detents may be configured at desired locations along theelongated aperture1426 to allow the user to achieve various intermediate lengths of the tension leg (and associated stiffness from the guidewire) by locking theactuator1424 in any of the desired intermediate detents.
• In an embodiment, thetension head1404 is configured to be rotatable about an axis oriented along the length of thetension wire1402. This would allow the user to simply rotate thetension head1404 to a desired position which may be less cumbersome for the user to extend or retract a tension leg based on the orientation of theguidewire1400 during a procedure. Alternatively, thetension head1404 is not rotatable about thetension wire1402 and is fixedly coupled thereto.
• In an embodiment, the integrated guidewire tension maintaining head may be combined with a tool to actuate the tension legs.FIG. 24 illustrates a side view of the integrated guidewiretension maintaining head1400 withdeployment tool1500 in accordance with such an embodiment. Thedeployment tool1500 preferably includes ahandle member1502, atrigger member1504, anelongated tray1508, atension brace1506, and acollar interface1510. Although thehandle member1502 is shown to have a pistol grip and anelongated trigger member1504, other appropriate shapes for thehandle1502 and/ortrigger member1504 are contemplated.
• As shown inFIG. 24, thetension head1404 is positioned within thedeployment tool1500 between thehandle1502 and thetension brace1506. Thehandle1502 preferably includes anactuating pin1512 positioned within achamber1514 therein, whereby thepin1512 preferably extends out of thehandle1502 when thetrigger1504 is depressed. Thetool1500 preferably includes anaperture1516 on thehandle1502 which is in communication with thepin chamber1514. In an embodiment, theaperture1516 is aligned with a receivingaperture1436 of thetension head1404 such that thepin1512, upon being actuated, extends out of thechamber1514 passes throughaperture1436 to press thetension leg1418 out ofchannel1412. As stated above, thetension leg1418 extends out ofhead1404 to the extended position in which theleg1418 abuts thecollar1408.
• In the embodiment inFIG. 24, thetension leg1418 separates the distance between thetension head1404 and thecollar1408. It is contemplated that thetension brace1506 may aid in separating thetension head1404 from thecollar1408 in that a combination of thetension brace1506 andtension leg1418 maintain stiffness of the guidewire. Thetension brace1506 preferably includes an aperture which is aligned with the exit aperture1438 of thetension head1404 such that thetension leg1418 passes through thetension brace1506 and abuts thecollar interface1510.
• As stated, thetension head1404 is rigidly attached to thetension wire1402 andguidewire body1406. In an embodiment, thetension head1404 is rigidly attached to thedeployment tool1500. In an embodiment, thetension head1404 is not rigidly attached to thedeployment tool1500, whereby thedeployment tool1500 may be used with different classes of guidewires having differently dimensioned tension heads and/or tension legs.
• It should be noted that thetension head1404 is shown inFIGS. 23 and 24 have a triangular shape. Although this is a preferred shape, thetension head1404 may alternatively have any other shape including, but not limited to, square, hexagonal, pentagonal, trapezoidal, spherical, circular, etc. It should be noted that the tension legs are shown in the Figures as bean-shaped, the tension legs may have any cross sectional shape, such as square, circular, rectangular, etc. Although three channels and tension legs are described above, it should be noted that any number of channels and tension legs, such as one channel or leg, are contemplated for a particular tension head.
• While embodiments and applications have been shown and described, it would be apparent to those skilled in the art having the benefit of this disclosure that many more modifications than mentioned above are possible without departing from the inventive concepts disclosed herein. The invention, therefore, is not to be restricted except in the spirit of the appended claims.

Claims (19)

1. A variable stiffness guidewire comprising:

a outer body including a plurality of coil windings oriented in a first direction, the outer body having a proximal end and a distal end and a hollow interior therebetween; and

a tension element positioned within the hollow interior and having first and second opposed ends, wherein the second end is coupled to the distal end of the outer body, the tension element including a plurality coil windings oriented in a second direction opposite to the first direction, the tension element configured to be pulled in a direction away from the distal end of the outer body to increase a stiffness in at least a portion of the guidewire.

2. The guidewire ofclaim 1, further comprising a head coupled to the tension element at the first end, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.

3. The guidewire ofclaim 1, wherein the tension element further comprises a head integrally formed therewith at the first end, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.

4. The guidewire ofclaim 1, wherein the second end of the tension element is crimped to the distal end of the outer body.

5. The guidewire ofclaim 1, wherein the outer body further comprises a collar at the proximal end.

6. The guidewire ofclaim 1, wherein the distal end of the outer body remains substantially stationary while stiffened when the tension element is pulled.

7. The guidewire ofclaim 1, wherein the first direction is a clockwise direction and the second direction is a counter-clockwise direction.

8. A variable stiffness guidewire comprising:

an outer body including a plurality of coil windings oriented in a first direction, the outer body having a proximal end and a distal end;

a tension element including a plurality coil windings oriented in a second direction opposite to the first direction between first and second opposing ends, the tension element positioned within the outer body, wherein the second end of the tension element is coupled to the distal end of the outer body; and

a head coupled to the first end of the tension element, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.

9. The guidewire ofclaim 8, wherein the second end of the tension element is crimped to the distal end of the outer body.

10. The guidewire ofclaim 8, wherein the head is integrally formed the tension element.

11. The guidewire ofclaim 8, wherein the outer body further comprises a collar at the proximal end.

12. The guidewire ofclaim 8, wherein the distal end of the outer body remains substantially stationary while stiffened when the tension element is pulled.

13. The guidewire ofclaim 8, wherein the first direction is a clockwise direction and the second direction is a counter-clockwise direction.

14. A method comprising:

selecting a variable stiffness guidewire having an outer body including a proximal end and a distal end, the outer body having a plurality of coil windings therebetween oriented in a first direction, the variable stiffness guidewire including a tension element positioned within the outer body and having a second end coupled to the distal end of the outer body, the tension element having a plurality coil windings oriented in a second direction opposite to the first direction;

operating the variable stiffness guidewire such that distal end is oriented in a desired direction; and

pulling a first end of the tension element in a direction away from the proximal end of the outer body to increase a stiffness in at least a portion of the guidewire, wherein the distal end remains substantially at the desired location while the stiffness is increased.

15. The method ofclaim 14, wherein the variable stiffness guidewire further comprises a head coupled to the tension element at the first end, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.

16. The method ofclaim 14, wherein the tension element further comprises a head integrally formed therewith at the first end, wherein the head has a cross sectional dimension no greater than a diameter of the outer body.

17. The method ofclaim 14, wherein the second end of the tension element is crimped to the distal end of the outer body.

18. The method ofclaim 14, wherein the outer body further comprises a collar at the proximal end.

19. The method ofclaim 14, wherein the first direction is a clockwise direction and the second direction is a counter-clockwise direction.

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