JP2009125438A - Medical guide wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical guide wire capable of excellently performing an insertion work to a blood vessel, etc. <P>SOLUTION: The medical guide wire 10 is made of a series of wires 11. Specifically, the medical guide wire 10 includes a linearly formed wire base part 14 and continues to a return region 17 returning to a near side from the wire base part 14 via a near side bending part 15 and a far side bending part 16. The near side bending part 15 is formed to allow a region 18 between the wire base part 14 and the far side bending part 16 to have a shape taking a detour to the opposite side of the bending side of the far side bending part 16 by defining an extension line E as reference. The end of the far side bending part 16 on the side of the middle region 18 is positioned so as to be spaced to the opposite side of the bending side of the far side bending part 16 from the extension line E. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a medical guide wire used when a catheter or the like is inserted into a living body.

A medical guide wire is inserted into a blood vessel or the like having a branch when performing diagnosis or treatment. Then, a catheter or the like is introduced into the living body using the inserted medical guide wire as a guide. In the medical guide wire, the shape of the distal end portion that can be pushed in following the blood vessel shape without damaging the living body at the time of insertion work is required. On the other hand, in recent years, for example, as shown in FIG. 9A, a medical guide wire 80 in which a return region 81 is formed so as to return to the proximal side at the distal end portion has been proposed (see FIG. 9A). For example, see Patent Document 1).
JP-A-2005-144104

  Here, the medical guide wire 80 is inserted from a thin blood vessel 82 such as the upper arm or wrist when inserted into a diagnosis target site or treatment target site such as the heart. In this case, as shown in FIG. As indicated by the solid line, the medical guide wire 80 extends the return region 81 toward the distal end, and is inserted into the blood vessel from the extended free end. The thin blood vessel 82 may have a branch blood vessel 83 that is not targeted in the middle of the thin blood vessel 82, and the free end of the return region 81 may enter the branch blood vessel 83. In this case, the return region 81 of the conventional medical guide wire 80 is unlikely to be restored to the J shape, and has entered the untargeted branch blood vessel 83 as shown by the two-dot chain line in FIG. There is a risk that.

  The present invention has been made in view of the above circumstances, and in a medical guide wire in which a region returning from the distal end top portion to the proximal side is formed, the medical guide wire can be favorably inserted into a blood vessel or the like. The object is to provide a guide wire.

  Hereinafter, means and the like effective for solving the above-described problems will be described while showing functions and effects as necessary.

  The medical guide wire of the present invention is curved toward the one side with respect to the direction in which the wire base extends by a predetermined length from the tip, so that the distal end of the entire guide wire has a smooth convex shape. A first bent portion formed such that the tip end side returns to the proximal end side with respect to the convex distal end top portion, and a proximal end side of the first bent portion with respect to a direction in which the wire base extends. And a second bent part that inclines the first bent part toward the other side by bending toward the other side opposite to the one side.

  According to this configuration, the distal end is inserted into a narrow tube (thin blood vessel or the like) inserted in a thin tube (thin blood vessel or the like) with the tip extended to the distal end side, and is provided in the middle of the thin tube. Even if the tip extended to the side enters, the second bending portion is formed, so that the force to move the first bending portion to the opposite side of the bending side of the first bending portion is obtained. Added. If it does so, the force pulled on the opposite side to the branch pipe side is also applied to the tip extended to the distal end side, and the tip extended to the distal end side is easily restored to the state of returning to the proximal side. In this restored state, it becomes easier to operate the medical guide wire so that it does not enter the branch tube side, and compared with conventional medical guide wires, it does not enter the branch tube. It becomes easy to do.

  The said structure WHEREIN: The said 2nd bending part is bent so that it may distance to the said other side, so that it goes to a distal end in the area | region from the bending start position with respect to the said wire base to the bending start position of the said 1st bending part. Good. In this case, it is possible to increase the force applied to the first bent portion so that the first bent portion is moved to the opposite side of the bent side of the first bent portion, and it is possible to improve the resilience.

  The said structure WHEREIN: It originates in the bending amount to the said other side of a said 2nd bending part, It is good for the distal end top part of a said 1st bending part to be arrange | positioned on the said other side.

  According to this structure, the introduction property to the target branch pipe (branch blood vessel etc.) can be improved. That is, since the distal end top portion is arranged on the opposite side to the bending direction side of the first bending portion with respect to the virtual extension line of the wire base, the distal end top portion is introduced when introduced into the branch pipe. By inserting the medical guide wire so that the side on which the is placed approaches the branch tube, the top of the distal end can be easily applied to the tube wall of the branch tube. Then, the force in the insertion direction transmitted from the proximal end side can be directed to the branch tube side, and the medical guide wire can be easily introduced into the target branch tube.

  Furthermore, according to this structure, the approach to the branch pipe which is not made into a target can be suppressed. That is, when the medical guide wire is inserted into a living body tube, the distal end side of the distal end portion may enter into a branch tube that is not targeted. In this case, since the distal end top portion is arranged on the opposite side to the bending direction side of the first bending portion with respect to the virtual extension line of the wire base, the tip end side enters the branch pipe that is not the target. Again, the distal tip of the medical guidewire is within the target tube. Since the force in the insertion direction transmitted from the proximal end side is transmitted to the top of the distal end, if the distal end top is in the target tube, the force in the insertion direction is not the target. It is suppressed that it goes into the branch pipe which is not made into the target.

  The said structure WHEREIN: It is good for the predetermined area | region which is at least one part of the front end side rather than the said distal end top part, and contains a front-end | tip to be arrange | positioned on the said one side. In this case, since a predetermined region including the tip that is on the tip side of the distal end top portion can be separated from the wire base, the tip of the predetermined region is inserted into a catheter, an introduction needle, a sheath, or the like Therefore, the insertion operation can be easily performed.

  Further, the predetermined region may be formed so as to move away from the one side toward the free end side which is the tip. In this case, since the predetermined region including the tip and closer to the distal end than the top of the distal end is separated from the wire base toward the free end, the tip of the predetermined region is placed on the catheter, introduction needle or When inserting into a sheath or the like, the insertion operation can be easily performed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. FIG. 1A is a schematic overall side view of the medical guide wire 10, and FIG. 1B is a longitudinal sectional view in a region C of FIG.

  As shown in FIG. 1A, the medical guide wire 10 is formed by a series of wires 11. As shown in FIG. 1B, the wire 11 is formed by coating a core wire 12 as a core metal with an outer skin 13 as a synthetic resin layer. The core wire 12 is made of a metal material. Specifically, it is formed of a Ni—Ti alloy that is a superelastic alloy. However, it is not limited to this, Other well-known superelastic alloys may be used, and a stainless alloy etc. may be used.

  The outer skin 13 is made of a synthetic resin material. Specifically, it is formed of a polyurethane elastomer. However, the present invention is not limited to this, and a fluorine resin such as PTFE, a polyamide resin such as nylon, polyethylene, polypropylene, polyolefin, or the like may be used.

  The surface of the outer skin 13 is coated with a hydrophilic lubricating film. The lubricating film is coated with a copolymer of polymethyl vinyl ether and maleic anhydride, but is not limited thereto, and other known materials may be used to form the lubricating film.

  The core wire 12 is formed so as to taper from an intermediate position in the length direction toward one end of the wire 11. Moreover, the outer diameter of the wire 11 is the same or substantially the same over the whole. However, the present invention is not limited to this, and the wire 11 may be formed so that the outer diameter decreases toward the end on the side where the core wire 12 is tapered. Specifically, the outer diameter of the wire 11 on the side where the core wire 12 is tapered is set to a predetermined dimension in a range of 0.69 mm or more and less than 0.85 mm, and the outer diameter of the opposite side is 0.79 mm or more and 0. It is good also as a dimension smaller than the taper side in the range below 85 mm.

  Next, the shape of the medical guide wire 10 will be described.

  The medical guide wire 10 has a distal end side on which the core wire 12 is tapered, and a plurality of bent portions 15 and 16 are formed on the distal end side as shown in FIG. In this way, the wire 11 is bent.

  Specifically, the medical guide wire 10 includes a wire base portion 14 formed along the axis of the medical guide wire 10 from the proximal end portion, and from the wire base portion 14 as a second bent portion. It continues to the return region 17 returning to the proximal side through the distal side bending portion 15 and the distal side bending portion 16 as the first bending portion.

  The wire base portion 14 is formed in a straight line shape or a substantially straight line shape. However, depending on the storage state of the medical guide wire 10, there may be a slightly curved shape. The medical guide wire 10 has a plurality of bent portions, that is, the proximal-side bent portion 15 and the distal-side bent portion 16 as described above, but the whole is included in the same plane or substantially included. ing.

  The proximal bending portion 15 has a region 18 (hereinafter referred to as an intermediate region 18) between the wire base 14 and the distal bending portion 16 on the distal side with respect to a virtual extension line E of the wire base 14. The bent portion 16 is formed so as to be detoured to the opposite side to the bent side. Further, the intermediate region 18 extends in a direction away from the extension line E toward the distal bending portion 16, that is, toward the opposite side of the bending side of the distal bending portion 16 toward the distal end. It is formed in a straight line so as to move away. By forming the proximal bent portion 15 and the intermediate region 18 in this way, the end portion (bending start position) of the distal bent portion 16 on the intermediate region 18 side is bent distally from the extension line E. The part 16 is in a position spaced away from the bent side.

  Incidentally, the proximal bending portion 15 is formed such that the angle α of the intermediate region 18 with respect to the wire base portion 14 (or the extension line E) is 150 degrees. However, the present invention is not limited to this, and the angle α may be larger than 90 degrees and smaller than 180 degrees, and is preferably in the range of 140 degrees to 170 degrees.

  The distal bending portion 16 is formed in a U shape so that a distal end top portion 19 of the medical guide wire 10 is generated at an intermediate position. That is, the distal-side bent portion 16 is formed so as to form a smooth convex shape bulging distally at the distal end top portion 19 and its periphery.

  Here, as described above, since the proximal-side bent portion 15 is formed, the distal-side bent portion 16 is inclined to the side opposite to the bent side of the distal-side bent portion 16 with respect to the extension line E. is doing. Specifically, the end of the distal bending portion 16 on the intermediate region 18 side is located at a position spaced apart from the extension line E on the opposite side of the bending side of the distal bending portion 16, and further the distal end top portion. 19 is at a position spaced from the extension line E to the side opposite to the bent side of the distal bent portion 16. In addition, the end portion (bending end position) of the distal bending portion 16 on the return region 17 side is relative to the intermediate region 18, the end portion of the distal bending portion 16 on the intermediate region 18 side, and the distal end top portion 19. It is located on the opposite side across the extension line E. A return region (predetermined region) 17 is formed so as to return to the proximal side from this position.

  The return region 17 is linearly formed so as to extend away from the extension line E toward the free end side that is the tip, that is, to extend in a direction away from the extension line E toward the proximal side. Further, as described above, the end of the distal bent portion 16 on the return region 17 side is located on the opposite side of the extension region E with respect to the intermediate region 18, so that the entire return region 17 is the intermediate region. 18 is located on the opposite side across the extension line E. Note that the angle β of the return region 17 with respect to the extension line E is arbitrary as long as it is an acute angle.

  The length dimension L1 of the return area 17 is substantially the same as the length dimension L2 of the intermediate area 18. Specifically, these length dimensions L1 and L2 are set to predetermined length dimensions in the range of 5.0 mm or more and 7.0 mm or less. The distance L3 from the axis L to the free end of the return area 17 is 5.5 mm, whereas the maximum distance L4 spaced from the axis L toward the intermediate area 18 is 3.7 mm. Yes. That is, distance L3> distance L4. However, the distance L3 may be a predetermined distance in a range of 3.0 mm to 6.0 mm, and the distance L4 is a predetermined distance in a range of 2.0 mm to 4.0 mm. Also good.

  Incidentally, as long as the wire can be formed in the above-mentioned shape, the method for manufacturing the medical guide wire 10 is arbitrary. For example, after forming the wire 11, heat is applied in the mold and the proximal bending portion 15 and By shaping the distal bending portion 16, the medical guide wire 10 can be manufactured.

  Next, how the medical guidewire 10 is inserted into the catheter 31 will be described in comparison with a conventional J-type medical guidewire 20. FIG. 2A is an explanatory diagram for explaining a state of insertion of the medical guide wire 10, and FIG. 2B is an explanatory diagram for explaining a state of insertion of a conventional medical guide wire 20. .

  As shown in FIG. 2 (b), the conventional medical guide wire 20 is formed with a return region 22 that returns from the distal end top 21 to the proximal side, and the return region 22 is parallel to the wire base 23. It is formed to become. The distance between the return region 22 and the wire base 23 is relatively narrow. In this case, when the medical guide wire 20 is inserted into the catheter 31, the return region 22 is extended to the distal end side and inserted into the catheter 31 from the extended leading edge. Since the distance between the return region 22 and the wire base 23 is relatively narrow, it is difficult to perform the insertion operation or an inserter is required as an auxiliary tool for extending the return region 22 to the distal end side. In addition, it is difficult to insert into the inserter.

  On the other hand, as described above, the medical guide wire 10 has the entire return region 17 and the entire intermediate region 18 positioned on opposite sides of the extension line E. 17 is formed in a straight line so as to extend in a direction away from the extension line E toward the proximal side. Therefore, as shown in FIG. 2A, the return region 17 has a relatively wide distance between the return region 17 and the intermediate region 18 facing the return region 17. It can be inserted into the catheter 31 without performing the work of extending to. Even if the return region 17 is extended to the distal end side, the operation can be easily performed without using an inserter or the like for extension. Moreover, even if an inserter is used, the insertion work to the inserter can be easily performed. Therefore, according to the medical guide wire 10, the insertion operation into the catheter 31 can be easily performed as compared with the conventional medical guide wire 20. In addition, the ease of insertion is not limited to the catheter 31, and is the same when inserting into an introduction needle or a sheath.

  Next, the restorability of the medical guide wire 10 in the blood vessel 32 will be described in comparison with the conventional J-type medical guide wire 20. FIG. 3A is an explanatory diagram for explaining the restoring property of the medical guide wire 10 in the blood vessel 32, and FIG. 3B shows the restoring property of the conventional medical guide wire 20 in the blood vessel 32. FIG. It is explanatory drawing for demonstrating.

  Here, when the medical guide wires 10 and 20 are inserted into a diagnosis or treatment target site such as the heart, the return regions 17 and 22 are extended to the distal end side and inserted into the thin blood vessels 33 on the upper arm, wrist, or the like. Is done. The medical guide wires 10 and 20 proceed through the thin blood vessel 33 while maintaining the state where the free ends of the return regions 17 and 22 are pressed against the blood vessel wall 34 of the thin blood vessel 33, and approach the diagnosis or treatment target site. Is inserted into the thick blood vessel 35.

  In this case, as shown in FIG. 3B, the conventional medical guide wire 20 is pressed against the blood vessel wall 34 by the free end of the return region 22 even if it is inserted from the thin blood vessel 33 into the thick blood vessel 35. The restored state is difficult to be released, and the restoring property to the natural state in which the return region 22 returns to the proximal side is poor. If it does so, the effect which provided the return area | region 22 will not fully be exhibited.

  On the other hand, the medical guide wire 10 is proximal so that the intermediate region 18 becomes a straight line extending in a direction away from the extension line E toward the distal bending portion 16 as described above. A side bent portion 15 is formed, whereby the end of the distal side bent portion 16 on the intermediate region 18 side is separated from the extension line E on the opposite side to the bent side of the distal side bent portion 16. In position. Therefore, as shown in FIG. 3A, when inserted from the thin blood vessel 33 into the thick blood vessel 35, the proximal bending portion 15 causes the distal bending portion 16 to reach the end on the intermediate region 18 side. On the other hand, a force is applied so as to move the distal bending portion 16 to the opposite side of the bending side. In particular, the intermediate region 18 is linearly formed so as to extend away from the extension line E toward the distal bending portion 16 as described above, and thus the force is increased. Then, a pulling force is applied to the return region 17 in a direction away from the blood vessel wall 34. Then, in the process of proceeding through the thick blood vessel 35, it is easy to release from the state where the free end of the return region 17 is pressed against the blood vessel wall 34 by the above-mentioned force, and the return region 17 returns to the proximal state. It is easy to return. Therefore, according to the medical guide wire 10, the resilience in the blood vessel is enhanced as compared with the conventional medical guide wire 20.

  Next, how the medical guide wire 10 is introduced into the target branch blood vessel 36 will be described in comparison with a conventional J-type medical guide wire 20. FIG. 4 is an explanatory diagram for explaining a state of introduction of the medical guide wire 10, and FIG. 5 is an explanatory diagram for explaining a state of introduction of the conventional medical guide wire 20.

  In the conventional medical guidewire 20, as shown in FIGS. 5 (a) and 5 (b), when the medical guidewire 20 is to be introduced into the target branch blood vessel 36, any direction with the axis of the medical guidewire 20 as the rotation axis is used. Even when the medical guide wire 20 is rotated, the distal end apex 21 of the medical guide wire 20 cannot be easily applied to the blood vessel wall of the branch blood vessel 36. In order to introduce the medical guide wire 20 into the target branch blood vessel 36, the distal end apex 21 is applied to the blood vessel wall of the branch blood vessel 36 to branch the force in the insertion direction transmitted from the proximal end side. Although it is necessary to face the blood vessel 36, the conventional medical guide wire 20 cannot easily do so as described above, and the introduction property to the target branch blood vessel 36 is poor.

  On the other hand, in the medical guide wire 10, as already described, due to the bending amount of the proximal bending portion 15, the end portion on the intermediate region 18 side of the distal bending portion 16 is extended. The distal end apex portion 19 of the medical guide wire 10 is bent from the extension line E to the bent side of the distal bent portion 16 at a position away from the bent side of the distal bent portion 16 from E. A distal-side bent portion 16 is formed so as to be spaced away from the opposite side. Therefore, as shown in FIG. 4 (a), by inserting the medical guide wire 10 so that the intermediate region 18 side faces the target branch blood vessel 36 side, as shown in FIG. 4 (b), The distal tip 19 of the medical guidewire 10 can be easily applied to the blood vessel wall of the target branch vessel 36. Then, the force in the insertion direction transmitted from the proximal end side can be directed to the branch blood vessel 36 side, and as shown in FIG. 4 (c), the medical guide wire 10 is directed to the target branch blood vessel 36. It can be easily introduced. Therefore, according to the medical guide wire 10, the introduction property to the target branch blood vessel 36 is enhanced as compared with the conventional medical guide wire 20.

  Next, a state in which the medical guide wire 10 is not introduced into the branch blood vessel (side branch) 37 that is not targeted will be described in comparison with the conventional J-type medical guide wire 20. FIG. 6 is an explanatory diagram for explaining a state in which the medical guide wire 10 is not introduced into the non-target branch blood vessel 37, and FIG. 7 is a diagram illustrating the conventional medical guide wire 20 that is introduced into the non-target branch blood vessel 37. It is explanatory drawing for demonstrating a state which will be.

  In the conventional medical guide wire 20, as shown in FIG. 7A, when the thin blood vessel 38 is advanced with the return region 22 extended to the distal end side, as shown in FIG. 7B. In addition, the free end of the return region 22 may enter the branch blood vessel 37 that is not the target. In this case, it is difficult for the medical guide wire 20 to be restored to the state where the free end of the return region 22 has returned to the proximal side, and as shown in FIG. End up.

  On the other hand, in the medical guide wire 10, as already described, the proximal-side bent portion 15 causes the end of the distal-side bent portion 16 on the intermediate region 18 side to be distant from the extension line E. Since it exists in the position spaced apart from the bending side of the bending part 16, the restoring property from the state which extended the return area | region 17 to the distal end side is improved. Therefore, as shown in FIG. 6A, even if the thin blood vessel 38 is advanced with the return region 17 extended to the distal end side, as shown in FIG. In the state where the free end of the return region 17 enters the state 37, it is easy to restore the state where the free end of the return region 17 returns to the proximal side.

  In addition, as described above, the medical guidewire 10 is such that the distal end top portion 19 of the medical guidewire 10 is located away from the bending side of the distal bending portion 16 from the extension line E. 6 (b), the distal end top portion 19 of the medical guide wire 10 does not hit the blood vessel wall of the branch blood vessel 37 that is not the target, as shown in FIG. It faces the target blood vessel side. Accordingly, the force in the insertion direction transmitted from the proximal end side does not go to the target branching blood vessel 37 side, and as shown in FIG. Can be prevented.

  Incidentally, when the thin blood vessel 38 is advanced 180 degrees from the state of FIG. 6A with the axis of the medical guide wire 10 as the rotation axis, it may be guided to the branch blood vessel 37 that is not the target. is there. However, in this case, instead of going through the branch vessel 37 that is not targeted starting from the free end of the return region 17, the branch vessel that is not targeted starting from the distal bent portion 16 formed in a smooth curved shape. 37, the branch blood vessel 37 can be prevented from being damaged.

  According to the present embodiment described in detail above, the proximal side bent portion 15, the distal side bent portion 16, the return region 17 and the intermediate region 18 are formed as described above. The insertion operation when the medical guide wire 10 is inserted into the catheter 31 can be easily performed, and the resilience in the blood vessel can be improved. Furthermore, as already described, the introduction into the target branch blood vessel can be improved, and the possibility of entering into the target branch blood vessel can be reduced.

  The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  (1) The shape of the medical guide wire may be changed as shown in FIG. The medical guide wire 40 shown in FIG. 8A is different from the medical guide wire 10 in that the distal bent portion 43 is such that the entire return region 41 is located on the intermediate region 42 side with respect to the extension line E. Is formed. In this case, since the distance between the free end of the return region 41 and the intermediate region 42 is shortened, the workability of the insertion work into the catheter may be lowered, but the resilience in the blood vessel is improved. be able to.

  (2) The shape of the medical guide wire may be changed as shown in FIG. A medical guide wire 50 shown in FIG. 8B is different from the medical guide wire 10 in that a smooth curved return portion 52 is formed at the free end of the return region 51. In this case, when the free end of the return region 51 hits the blood vessel wall, the smooth curved return portion 52 hits, and the burden on the blood vessel wall can be reduced.

  (3) The shape of the medical guide wire may be changed as shown in FIG. The medical guide wire 60 shown in FIG. 8C is different from the medical guide wire 10 so that the distal end portion 61 is positioned away from the extension line E to the bending side of the distal bending portion 62. A distal bent portion 62 is formed in the upper portion. In this case, as compared with the medical guide wire 10, the introduction property to the target branch blood vessel is lowered, and it is easy to enter the target branch blood vessel. However, the proximal-side bent portion 64 is formed so that the intermediate region 63 has a shape detoured to the side opposite to the bent side of the distal-side bent portion 62 with respect to the extension line E. Since the end of the intermediate region 63 on the side of 62 is spaced from the extension line E to the side opposite to the bent side of the distal bent portion 62, the blood vessel is compared with the conventional J-type medical guide wire. The resilience within can be improved. In addition, the entire return region 65 and the entire intermediate region 63 are positioned on opposite sides of the extension line E, and the return region 65 is separated from the extension line E toward the proximal side. Since it is formed in a straight line so as to extend, an insertion operation when the medical guide wire 60 is inserted into the catheter can be easily performed as compared with a conventional J-type medical guide wire.

  In addition, since the proximal-side bent portion 64 is formed as described above, it is not as much as the medical guide wire 10 in the above-described embodiment, but compared with the conventional J-type medical guide wire, As described above, the resilience in the blood vessel is enhanced, so that the introduction into the target branch blood vessel can be improved, and the possibility of entering into the target branch blood vessel can be reduced.

  (4) The shape of the medical guide wire may be changed as shown in FIG. Unlike the medical guide wire 10, the medical guide wire 70 illustrated in FIG. 8D does not have an intermediate region between the proximal bent portion 71 and the distal bent portion 72. That is, the proximal-side bent portion 71 is formed to bend to the side opposite to the bent side of the distal-side bent portion 72, and the bending end position of the proximal-side bent portion 71 and the bending of the distal-side bent portion 72 are bent. The start position is the same position (that is, the inflection point 73 exists). Even with the medical guide wire 70, the same effects as those of the medical guide wire 10 in the above embodiment can be obtained.

  (5) The wire 11 forming the medical guide wire 10 does not have to have an internal / external double structure, and may have an internal / external triple structure. In addition, the medical guide wire 10 in the above embodiment is mainly used to treat blood vessels such as coronary arteries, femoral arteries, and pulmonary arteries through the blood vessels. It can be applied to in-vivo “tubes” and “body cavities”.

(A) The schematic whole side view of a medical guide wire, (b) The longitudinal cross-sectional view in the area | region C of Fig.1 (a). (A) Explanatory drawing for demonstrating the mode of insertion to a catheter, (b) Explanatory drawing for demonstrating the mode of insertion to the catheter of the conventional medical guide wire. (A) Explanatory drawing for demonstrating the restoring property in the blood vessel of a medical guide wire, (b) Explanatory drawing for demonstrating the restoring property in the blood vessel of the conventional medical guide wire. (A)-(c) Explanatory drawing for demonstrating the mode of introduction | transduction to the target branch blood vessel. (A), (b) Explanatory drawing for demonstrating the mode of introduction of the conventional medical guide wire. (A)-(c) Explanatory drawing for demonstrating a mode that it is not introduce | transduced into the branch blood vessel which is not made into a target. (A)-(c) Explanatory drawing for demonstrating a mode that it introduce | transduces into the branch blood vessel which is not made into the target in the conventional medical guidewire. (A)-(d) Explanatory drawing for demonstrating another medical guide wire. (A), (b) Explanatory drawing for demonstrating background art and a subject.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Medical guide wire, 11 ... Wire, 14 ... Wire base, 15 ... Proximal bending part, 16 ... Distal bending part, 17 ... Return area | region, 18 ... Middle area | region, 19 ... Distal end part, 40 ... medical guide wire, 50 ... medical guide wire, 60 ... medical guide wire, 70 ... medical guide wire.

Claims (5)

By curving a predetermined length from the tip toward one side with respect to the direction in which the wire base extends, the distal end of the guide wire as a whole becomes a smooth convex shape, and the top of the distal end of the convex shape A first bent portion formed such that the distal end side returns to the proximal end side,
The first bent portion is inclined toward the other side by bending the proximal end side of the first bent portion toward the other side opposite to the one side with respect to the direction in which the wire base extends. A second bent portion to be made,
A medical guide wire comprising:   The second bending portion is bent in a region from a bending start position with respect to the wire base to a bending start position of the first bending portion so as to move away from the other side toward the distal end. The medical guide wire according to claim 1.   The distal end top portion of the first bent portion is disposed on the other side due to the amount of bending of the second bent portion to the other side. The medical guidewire as described.   The medical region according to any one of claims 1 to 3, wherein a predetermined region that is at least part of the distal end side of the distal end top and includes the distal end is disposed on the one side. Guide wire.   The medical guide wire according to claim 4, wherein the predetermined region is formed so as to move away from the one side toward a free end side that is a distal end.

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