JP2012005520A - Medical guide wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical guide wire capable of preventing an excessive progress of prolapse.SOLUTION: The medical guide wire 1A has a configuration in which a front end side disk-like portion 6A and a base end side disk-like portion 6B as convex portions protruding outward centered on an axis line of the front end of a core shaft 2 are formed on the front end of the core shaft 2 side by side along the axis line direction of the front end of the core shaft 2, a separated distance c between the front and base end side disk-like portions 6A and 6B is set to be shorter than a height a or b of a lower convex portion, out of the height a of the convex portion of the front end side disk-like portion 6A and the height b of the convex portion of the base end side disk-like portion 6B, and an end face of the front end side disk-like portion 6A and an end face of the base end side disk-like portion 6B which are mutually adjacently facing approach and contact to each other when the front end of the core shaft 2 is bent.

Description

  The present invention relates to a medical guide wire suitably used in the medical field.

  A medical guide wire (medical guide wire) used as a guide when inserting a catheter into a blood vessel, ureter, or organ in a medical field, or inserting an indwelling device into an aneurysm formation part of a blood vessel, Already well known. Usually, the medical guide wire includes a core shaft and a coil body wound around the outer periphery of the distal end portion of the core shaft, and the distal end portion of the coil body and the distal end portion of the core shaft are joined together. .

  In addition, when inserting a medical guidewire into a patient's blood vessel, etc., the tip of the medical guidewire should be attached for the purpose of preventing perforation at the peripheral part or preventing unintentional entry into the side branch. It is already known that there is a case where it is intentionally prolapsed (bent into a U-shape).

  Furthermore, in order to deform the distal end portion of the guide wire without deviation, a configuration including a core material having a projecting portion that projects concentrically with respect to the axis, and a coil that encapsulates at least the distal end side portion of the core material is provided. It has already been disclosed (see Patent Document 1). Further, in order to improve the operability of the guide wire by imparting pressing property and torque transmission property to the core member, a long core member and a length disposed around the proximal end portion of the distal end section of the core member The structure provided with the scale-shaped reinforcement member is already disclosed (refer patent document 2).

JP 2006-271955 A International Publication No. 2005/03011

  However, in the medical guide wire described in Patent Document 1, the distal end portion bends without unevenness, but the distal end portion is excessively bent, and the prolapse (U-shaped) of the medical guide wire is excessively developed. As a result, the core shaft and the coil body of the guide wire are damaged, and the operability is inferior. Moreover, in the medical guide wire described in Patent Document 2, although the pressing property, torque transmission property, and the like are improved by the reinforcing member, there is a problem in that the tip portion is excessively bent and the prolapse is excessively advanced. Had.

  In view of the above problems, an object of the present invention is to prevent excessive progress of prolapse by suppressing excessive bending of a medical guide wire.

  The present invention relates to a medical guide wire comprising a core shaft and a first coil body fixed to the core shaft in a state in which at least the distal end portion of the core shaft is wound. Are formed with a plurality of protrusions extending outwardly about the axis of the tip, and are spaced apart from each other between a pair of adjacent protrusions. Is shorter than the height of the convex portion in the outward direction relative to the axis of the pair of convex portions, or when the convex portion height of the pair of convex portions is the same, the height of the convex portion It is a medical guide wire characterized by being short.

  In the above configuration, when the core shaft is slightly bent, the tips of the adjacent convex portions do not come into contact with each other, and the medical guide wire is allowed to be bent. On the other hand, when the core shaft is further bent, the tips of adjacent convex portions approach each other and come into contact with each other, and the bending of the core shaft is suppressed in this contact state. Therefore, in the medical guide wire, since the core shaft does not bend excessively during operation, excessive progress of prolapse can be prevented.

  Further, the convex portion may be a disk-shaped portion that protrudes outward about the axis of the tip portion of the core shaft.

  By setting it as the said structure, even if a core shaft bends in which direction, adjacent convex parts can be contact | abutted reliably and the excessive bending of a core shaft can be suppressed.

  Further, it is preferable that the plurality of convex portions be in non-contact with the inner side surface of the coil body in a non-bent state where no external force is applied to the core shaft.

  With the above configuration, since the coil body and the convex portion do not interfere even when the medical guide wire is bent, the coil body can be prevented from being damaged by the convex portion.

  Moreover, the separation distance between a pair of adjacent convex portions may be set to be smaller than the wire diameter of the coil body.

  With the above configuration, even if the medical guide wire is bent, the wire of the coil body does not enter between the adjacent convex portions, so that the coil body can be more reliably damaged. Can be prevented.

  Further, at least one of the distal end side of the convex portion arranged in the axial direction of the core shaft and the proximal end side of the convex portion arranged at the most proximal side is connected to the convex portion. A reinforcing member may be provided.

  If a convex part and a reinforcement member are connected by the above structures, the said convex part will become difficult to deform | transform along the axial direction of a core shaft. Therefore, even if a large force is applied to the core shaft, the tip end portion bends greatly, and even if the protrusions are strongly bonded to each other, deformation of the protrusions is suppressed, so that excessive bending of the core shaft is ensured. And the excessive development of the prolapse of the medical guide wire can be surely prevented.

  The reinforcing member may be a second coil body.

  By adopting a coil body as the reinforcing member, it is possible to effectively suppress deformation of the convex portion with a simple structure.

  The second coil body may be formed of a rectangular cross-section element wire.

  When the second coil body having the above configuration is bent, the outer surfaces of the strands are pressure-bonded by surface contact. Therefore, the second coil body has a structure that is less likely to be bent than the coil bodies having other configurations. For this reason, by using the second coil body having such a structure as a reinforcing member, excessive bending of the distal end portion of the core shaft is more reliably prevented, and excessive progress of the prolapse of the medical guide wire is achieved. Can be surely prevented.

  In the medical guide wire of the present invention, excessive bending of the core shaft is suppressed, so that excessive progress of the prolapse can be reliably prevented.

Explanatory drawing which shows the medical guide wire concerning Example 1. FIG. AA line sectional view of FIG. a) An enlarged explanatory view showing the distal end portion of the medical guide wire when not bent, and b) An enlarged explanatory view showing the distal end portion of the medical guide wire when bent. Explanatory drawing which shows the medical guide wire concerning Example 2. FIG. Explanatory drawing which shows the medical guide wire concerning Example 3. FIG. Explanatory drawing which shows the medical guide wire concerning Example 4. FIG. Explanatory drawing which shows the medical guide wire concerning Example 5. FIG. Explanatory drawing which shows the medical guide wire concerning Example 6. FIG.

Examples 1 to 6 of the medical guide wire according to the present invention will be described with reference to the accompanying drawings.
Example 1
As shown in FIG. 1, the medical guide wire 1 </ b> A includes a bendable core shaft 2 having a tapered round bar shape in which a distal end side has a small diameter and a proximal end side has a large diameter.

  In addition, an outer coil body 3 as a first coil body in the present invention is fixed to the tip of the core shaft 2. The outer coil body 3 is wound around the outer periphery of the distal end portion of the core shaft 2, and the distal end is fixed to the distal end of the core shaft 2 to form a substantially hemispherical most distal end portion 4. . Further, the base end of the outer coil body 3 is fixed to the core shaft 2 via a fixing portion 5. In addition, the forefront portion 4 has a shape that is larger than the outer diameter of the tip of the core shaft 2. Moreover, the said fixing | fixed part 5 can employ | adopt suitably the well-known technique (For example, an adhesive agent, brazing, or welding) using a well-known material.

  In addition, a pair of disk-shaped portions 6 as convex portions in the present invention are formed side by side at the tip end portion of the core shaft 2 and inside the outer coil body 3. More specifically, as shown in FIG. 2, a disc-shaped portion 6 is formed at the tip of the core shaft 2 so as to extend outward from the axis of the core shaft 2 and project. As shown in FIG. 1 and the like, two such disk-shaped portions 6 are provided adjacent to each other in the axial direction of the core shaft 2. The disc-shaped portion 6 disposed on the distal end side of the core shaft 2 is defined as a distal-end-side disc-shaped portion 6A, and the proximal-side disc disposed away from the distal-end-side disc-shaped portion 6A in the proximal direction. The shape portion 6 is a proximal-side disk shape portion 6B.

The disk-shaped portions 6A and 6B can be formed by the following means.
For example, by inserting the core shaft 2 into a disk-shaped member having a through hole, and fixing the disk-shaped member to the core shaft 2 by a known method (for example, adhesive, brazing, or welding), the disk The shape parts 6A and 6B can be formed. Further, for example, the disk-shaped portions 6A and 6B can be formed by providing a disk-shaped portion on the outer peripheral surface of the core shaft 2 using a brazing material.

  As described above, when the disk-shaped portions 6A and 6B are formed of the disk-shaped member, the disk-shaped member and the core shaft 2 are made of the same material in consideration of the adhesiveness with the core shaft 2. It is preferable to comprise. For example, when the core shaft 2 is made of a stainless alloy, it is preferable to employ a disk-shaped member made of a stainless alloy.

  Further, as described above, when the disk-shaped portions 6A and 6B are formed of the brazing material, the disk-shaped portions 6A and 6B are previously formed on the core shaft 2, and then the core shaft 2 is formed on the core shaft 2. It is preferable to employ a method of mounting the outer coil body 3.

  In the medical guide wire 1A, as shown in FIG. 3a, the convex portion height a of the distal-end-side disc-shaped portion 6A and the convex portion height b of the proximal-end-side disc-shaped portion 6B Is set such that the distance c between the distal-side disc-shaped portion 6A and the proximal-side disc-shaped portion 6B is shorter than the lower convex-portion heights a and b (a , B> c). Further, when the heights of the convex portions of the pair of disk-shaped portions 6A and 6B are the same, the distance c is set to be shorter than the heights of the convex portions a and b (a = b>). c).

  Here, the convex part heights a and b are distances (heights) from the outer surface of the core shaft 2 to the tips of the disk-shaped parts 6A and 6B projecting outward from the axis of the core shaft 2 as the center. However, when a plurality of different protrusion heights a and b are measured in each of the disk-shaped portions 6A and 6B depending on the outer shape of the core shaft 2 and the outer shapes of the disk-shaped portions 6A and 6B, a plurality of measured heights of the protrusions are measured. An average value of the heights is calculated, and the height of the convex portion of the average value can be adopted as the height of the convex portions a and b.

  Further, the height a of the convex portion 6A of the front end side disk-shaped portion and the height b of the convex portion of the base end side disc-shaped portion 6B are such that both the disk-shaped portions 6A and 6B are accommodated inside the outer coil body 3. In the non-bending state in which no external force is applied to the core shaft 2, the tips of both disk-shaped portions 6 a and 6 b are not in contact with the inner peripheral surface of the outer coil body 3. .

  Further, a separation distance c between the adjacent distal end side disk shape portion 6A and the proximal end side disk shape portion 6B is set to be smaller than the wire diameter of the outer coil body 3.

  When the core shaft 2 is slightly bent during the operation of the medical guide wire 1A, the two disk-shaped portions 6A and 6B do not contact each other, but when the core shaft 2 is further bent, FIG. As shown in FIG. 6, the adjacent distal end disk-shaped portion 6A and proximal end disk-shaped portion 6B come into contact with each other as the core shaft 2 is bent. In such a contact state of the disk-shaped portions 6A and 6B, since the core shaft 2 cannot be bent any more, the bending of the core shaft 2 is restricted and excessive bending is suppressed. It will be. Therefore, in the medical guide wire 1A, since the core shaft 2 does not bend excessively, excessive progress of prolapse can be prevented.

  Note that the convex heights a and b of the distal-side disc-shaped portion 6A and the separation distance c between the distal-end-side disc-shaped portion 6A and the proximal-side disc-shaped portion 6B have the above relationship, so both disc shapes Each tip of the portions 6A and 6B abuts reliably when the core shaft is bent.

  In addition, as described above, both the disk-shaped portions 6A and 6B are accommodated in the outer coil body 3 in a non-contact manner, and the distance c between the both disk-shaped portions 6A and 6B is further reduced. Therefore, when the core shaft 2 is bent, the two disk-shaped portions 6A and 6B do not interfere with the outer coil body 3, and further between the two disk-shaped portions 6A and 6B. Since the strand of the outer coil body 3 does not enter the outer coil body 3, the outer coil body 3 is not damaged.

  Further, in the above configuration, since both the disk-shaped portions 6A and 6B are formed to extend around the entire circumference of the core shaft 2, both the disks are bent regardless of the direction in which the tip portion of the core shaft 2 is bent. The tips of the shape portions 6A and 6B can contact each other.

  In the configuration described so far, the dimensions and the like of both the disk-shaped portions 6A and 6B can be appropriately set in consideration of the operability of the medical guide wire 1A. In the above configuration, both disk-shaped portions 6A and 6B are formed to extend around the entire circumference of the core shaft 2, but the present invention has a configuration in which, for example, a part of both disk-shaped portions 6A and 6B are cut out. Is not to be excluded.

(Example 2)
Hereinafter, the medical guide wire 1B according to the second embodiment will be described with reference to FIG. 4, but the description common to the first embodiment is omitted, and the same reference numerals are given in the drawing.
Of course, the number of the disk-shaped portions 6 may be two or more, like the medical guide wire 1B shown in FIG. By forming a plurality of (for example, four) disk-shaped portions 6 in this way, it is possible to suitably suppress excessive bending with respect to a desired section along the axial direction of the core shaft 2.

(Example 3)
Hereinafter, the medical guide wire 1C according to the third embodiment will be described with reference to FIG. 5, but the description common to the first and second embodiments is omitted, and the same reference numerals are given in the drawing.
In the medical guide wire 1C, a distal-side reinforcing member 7 constituted by an inner coil body as a second coil body according to the present invention is disposed closer to the distal end side of the core shaft 2 than the distal-side disc-shaped portion 6A. It is fixed. More specifically, the front end side reinforcing member 7 is composed of a single wire coil, and is arranged along the axial direction of the front end portion of the core shaft 2 by winding the front end portion of the core shaft 2. The distal end is fixed to the most distal end portion 4, and the proximal end is connected to the distal end side disk-shaped portion 6 </ b> A via a fixing portion 17.

  On the other hand, a proximal-side reinforcing member 8 composed of an inner coil body in which a rectangular cross-section element wire is wound is fixed to the proximal side of the core shaft 2 from the proximal-side disk-shaped portion 6B. More specifically, the proximal end side reinforcing member 8 is disposed along the axial direction of the distal end portion of the core shaft 2 by winding the distal end portion of the core shaft 2, and the distal end thereof Is connected to the base-side disk-shaped portion 6B via a fixed portion 18A, and the base end is fixed to the core shaft 2 via the fixed portion 18B. In addition, the said fixing | fixed part 17,18A, 18B can employ | adopt suitably the well-known technique (For example, an adhesive agent, brazing, or welding) using a well-known material. In addition, the distal end side reinforcing member 7 and the proximal end side reinforcing member 8 are closely wound, thereby further preventing deformation of the disk-shaped portions 6A and 6B in the axial direction of the core shaft 2. be able to.

  In the medical guide wire 1C, the distal-side disc-shaped portion 6A is connected to the distal-side reinforcing member 7 and the proximal-side disc-shaped portion 6B is connected to the proximal-side reinforcing member 8, The disk-shaped portions 6 </ b> A and 6 </ b> B are reinforced by the reinforcing members 7 and 8, respectively, and are not easily deformed along the axial direction of the core shaft 2. Therefore, even if a large force is applied to the medical guide wire 1C, the core shaft 2 is bent greatly, and the disk-shaped parts 6A, 6B are strongly pressed against each other, the deformation of the disk-shaped parts 6A, 6B is suppressed. Therefore, excessive bending of the core shaft 2 is surely suppressed, and excessive progress of the prolapse of the medical guide wire 1C is prevented.

  In addition, since the inner side coil body which comprises the said base end side reinforcement member 8 is a rectangular cross-section strand, it has the structure where the outer surfaces of the adjacent strand at the time of a bending | flexion are in surface contact, and cannot bend easily. For this reason, by adopting the coil body as the base end side reinforcing member 8, excessive bending of the distal end portion of the core shaft 2 is more reliably suppressed.

  In this embodiment, the reinforcing members 7 and 8 are connected to the distal-side disc-shaped portion 6A and the proximal-side disc-shaped portion 6B, respectively, but the distal-side disc-shaped portion 6A and the proximal-side disc-shaped portion 6B. Of course, the structure which provided the reinforcement members 7 and 8 in at least any one of these may be sufficient.

Example 4
Hereinafter, although the medical guide wire 1D according to the fourth embodiment will be described with reference to FIG. 6, the description common to the first to third embodiments is omitted, and the same reference numerals are given in the drawing.
As shown in FIG. 6, the medical guide wire 1 </ b> D includes a distal-side reinforcing member 27 connected to the distal-side disk-shaped part 6 </ b> A and a proximal-side reinforcing member 8 connected to the proximal-side disk-shaped part 6 </ b> B. A coil body wound with a wire is employed.

  The configuration of the present embodiment is a more desirable configuration as compared to the third embodiment, and the deformation of the distal end side disk-shaped portion 6A is further suppressed as compared with the configuration of the third embodiment because the distal end side reinforcing member 27 is difficult to bend. Therefore, excessive bending of the tip of the core shaft 2 is further suppressed.

(Example 5)
Hereinafter, although the medical guide wire 1E concerning Example 5 is demonstrated according to FIG. 7, description is abbreviate | omitted about the part which is common in Examples 1-4, and supposes that the same code | symbol is attached | subjected in a figure.
As shown in FIG. 7, the medical guide wire 1 </ b> E has a configuration in which reinforcing members 27 and 8 are provided in addition to the configuration of the second embodiment. Specifically, the four guide portions 6 (6 </ b> C, 6 </ b> D, 6E, 6F), the front end side reinforcing member 27 connected to the disk-shaped part 6C is provided on the front end side of the disk-shaped part 6C arranged at the foremost in the axial direction of the core shaft 2, A proximal-side reinforcing member 8 connected to the disk-shaped part 6D is provided on the proximal-side of the disk-shaped part 6D arranged on the most proximal side.

  The configuration of the present embodiment makes it possible to suitably suppress excessive bending with respect to a desired section along the axial direction of the core shaft 2 by the plurality of disk-shaped portions 6, and the disks by the reinforcing members 27 and 8. The excessive bending of the tip end portion of the core shaft 2 can be reliably suppressed by suppressing the deformation of the shape portions 6C and 6D.

(Example 6)
Hereinafter, although the medical guide wire 1F concerning Example 6 is demonstrated according to FIG. 8, description is abbreviate | omitted about the part which is common in Examples 1-5, and shall attach | subject the same code | symbol in a figure.
In addition to the configuration of the fifth embodiment, the medical guide wire 1F is provided between a pair of disk-shaped portions 6E and 6F located in the middle of the four disk-shaped portions 6 (6C, 6D, 6E, and 6F). Also, the reinforcing member 19 formed of a coil body is provided. Specifically, the tip of the reinforcing member 19 is connected to the disc-shaped portion 6E located second from the tip side in the axial direction of the core shaft 2 via the fixing portion 20A, and the disc located third from the tip side. The base end of the reinforcing member 19 is connected to the shape portion 6F via the fixing portion 20B.

  By adopting the configuration of the present embodiment, deformation of the disk-shaped portion 6 (6C, 6D, 6E, 6F) can be suitably suppressed. In addition, it is good also as a structure which employ | adopted only the reinforcement member 19 concerning the present Example 6. FIG. Thereby, the deformation | transformation of the disk-shaped part 6 located in the middle among the disk-shaped parts 6 provided in multiple numbers can be suppressed, and the excessive bending of the front-end | tip part of the said core shaft 2 can be suppressed.

The present invention is not limited to the first to sixth embodiments described above, and it is of course possible to change the design as appropriate without departing from the gist of the present invention.
For example, the convex part of this invention is not limited to the said disk shape, Of course, other shapes may be sufficient. Further, the coil body of the reinforcing members 7, 8, 19, and 27 may be a single wire coil or a multi-strand coil. Further, the reinforcing members 7, 8, 19, and 27 are not limited to the coil body, and may be other long members. The shape of the other long member may be, for example, a round cross-section wire or ribbon, may be a tube shape such as a spring or a hypotube, may be a stranded wire, etc. The form can be selected as appropriate.

1A to 1F Medical guide wire 2 Core shaft 3 Outer coil body (first coil body)
6 (6A-6F) Disc shape part (convex part)
7, 8, 19, 27 Reinforcing member (second coil body)
a, b Height of convex part of disk-shaped part c Separation distance

Claims (7)

In a medical guide wire comprising a core shaft and a first coil body fixed to the core shaft in a state in which at least a tip portion of the core shaft is wound,
At the tip portion of the core shaft, a plurality of convex portions projecting outward about the axis of the tip portion are formed side by side along the axial direction of the tip portion, and
The separation distance between a pair of adjacent protrusions is
Of the pair of convex portions, the convex portion height in the outward direction with respect to the axis is shorter than that having a low height, or when the convex portion heights of the pair of convex portions are the same, the convex portion height is shorter. A medical guide wire characterized by   The medical guide wire according to claim 1, wherein the convex portion is a disc-shaped portion that protrudes outward about the axis of the tip portion of the core shaft.   3. The medical guide wire according to claim 1, wherein the plurality of protrusions are in non-bending state in which an external force is not applied to the core shaft and are not in contact with the inner surface of the coil body.   The medical guide wire according to any one of claims 1 to 3, wherein a separation distance between a pair of adjacent convex portions is set to be smaller than a wire diameter of the coil body.   Reinforcement connected to the convex portion at least one of the distal end side of the convex portion arranged at the foremost in the axial direction of the core shaft and the proximal end side of the convex portion arranged at the most proximal side The medical guide wire according to any one of claims 1 to 4, further comprising a member.   The medical guide wire according to claim 5, wherein the reinforcing member is a second coil body. The medical guide wire according to claim 6, wherein the second coil body is configured by a rectangular cross-section element wire.

Images