JP2502565Y2 - Medical guidewire - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical guidewire used for inserting a catheter into blood vessels, ureters, bile ducts, trachea and the like.

[0002]

2. Description of the Related Art In recent years, for examination and treatment of tubular organs of the human body such as blood vessels, ureters, bile ducts, and trachea, a catheter is inserted to administer a drug such as a contrast medium, or tissue is passed through a catheter by forceps or the like. Some of them are collected. When inserting a catheter, a relatively thin and flexible guide wire is first inserted into a tubular organ, and after inserting the catheter along the outer periphery of the guide wire, the guide wire is withdrawn.

As the medical guide wire, for example, (1) a metal wire made of stainless steel, shape memory alloy, or the like is formed with a tapered tip and a synthetic resin film is coated on the outer periphery, (2) Relatively A thick metal wire with a coil wound tightly wound on the tip of a wire, (3) Inserting a safety wire and an inner core wire into the coil of the tight winding, and putting those ends into the coil end. Various things have been proposed, such as those fixed to.

Known guidewires utilizing a coil wound in close contact are, for example, Japanese Utility Model Publication No. 62-157551 and Japanese Utility Model Publication No. 1-77758. As shown in FIG. 5, these guide wires have a guide head portion 5 at the tip portion.
3. A safety wire 59 and an inner core wire 61 having a tapered tip end are inserted into a flexible close-wound coil 57 having a base lid 55 at the base end. There is. Normally, the safety wire 59 and the inner core wire 6
The end 1 of the guide 1 is fixed to the guide head portion 53 and the base lid portion 55. This guide wire 51 is a safety wire 59.
The expansion of the coil is regulated by this, the rigidity is given to the base side by the inner core wire 61, and the flexibility is obtained at the tip of the coil.

When inserting the guide wire 51 into a blood vessel or the like, as shown in FIG. 6, the distal end portion of the guide wire 51 is directed in a desired direction at a branch point in the blood vessel 63, and the traveling direction is set. Therefore, the doctor in charge had to rotate the guide wire 51 in a predetermined direction at his or her hand to orient the distal end portion of the guide wire 51 in a desired direction.

[0006]

However, since such a guide wire is required to reach the affected part at its distal end, it is usually made relatively long, and the body is a coil wound in close contact. Therefore, even if the wire is rotated at the hand part to orient the tip in the desired direction, the rotational force is not absorbed by the coil and is not transmitted to the tip, and the tip is moved in the desired direction. It was difficult to point. Therefore, in the branched portion of the blood vessel or the like, guiding the distal end portion of the guide wire into the target blood vessel, that is, the blood vessel selectivity is poor, and it is difficult to use for insertion work.

[0007] Therefore, an object of the present invention is to provide a medical guide wire which maintains appropriate flexibility and has improved rotation transmissibility.

[0008]

In order to achieve the above object, the present invention provides a flexible tightly wound coil, and both ends arranged inside the coil and fixed to both ends of the coil. A medical guide wire comprising a safety wire and an inner core wire arranged in the coil and having a tapered distal end, wherein the coil has multiple windings and / or multiple windings in which winding directions are alternately changed. In addition, the rotation transmissibility is improved.

In a preferred aspect of the present invention, a coil having a single winding and a single winding is further joined to the tip of the coil.

In another preferred aspect of the present invention, a marker opaque to X-rays is provided at the tip of the coil.

[0011]

When the coil has a plurality of turns, even if the coil is closely wound, the coil pitch becomes longer than the one-turn coil, and the number of turns as a whole is reduced. The rotation transmission force is more easily absorbed as the number of windings of the coil increases, so that the rotation transmission force can be improved by reducing the number of windings of each wire rod by making a plurality of windings as described above.

Further, when the coils are formed into a plurality of multiple turns in which the winding directions are alternately changed, the inside of the adjacent coils is expanded and the outside is contracted by selecting the rotating direction. The inner and outer coils are pressed against each other to enhance the rotation transmission force.

Therefore, when the coil has a plurality of windings and a plurality of windings in which the winding directions are alternately changed, the rotation transmission force can be further increased.

As described above, the medical guide wire according to the present invention has an improved rotation transmission force, and therefore has good operability when the distal end portion is aimed in the intended direction at the branching portion of a blood vessel or the like. . Further, since it is mainly made of a coil, the flexibility required for a medical guide wire is secured. The safety wire disposed inside the coil regulates the elongation of the coil, and the inner core wire having a tapered tip end portion imparts appropriate rigidity to the coil and flexibility at the tip end portion. The points are the same as the conventional ones.

In a preferred embodiment of the present invention, when a single-strand, single-winding coil is further joined to the tip of the coil, the flexibility of the tip can be further increased.

In another preferred aspect of the present invention, when the tip of the coil is provided with a marker impermeable to X-rays, the position of the tip of the coil inside the blood vessel or the like is determined by the X-ray. You can work while checking with the camera.

[0017]

1 shows an embodiment of the medical guidewire of the present invention.

The coil 13 of the guide wire 11 is made of stainless steel in this embodiment, and is formed by tightly winding three wire rods 1, 2 and 3 aligned in parallel with the coil axial direction. The tip portion of the coil 13 is a melted and rounded head portion 15, which is designed so as not to damage the inside of a blood vessel or the like. On the other hand, the coil 13
A disk-shaped member is welded to the base end of the base to form a base cover 17. In this embodiment, the wires 1, 2, 3 of the coil 13 are round wires, but they may be square wires or flat wires.

Inside the coil 13, a safety wire 19 and an inner core wire 21 are longitudinally arranged. The safety wire 19 is made of stainless steel and has a tip portion 19a.
The base end portion 19b is fixed to the head portion 15 and the base end portion 17 respectively, and the extension of the coil 13 is restricted. Further, the inner wire 21 is made of an elongated plate material made of stainless steel having a tapered thin end portion, and the safety wire 19
It is arranged almost parallel to. This taper wire 21
Has only the base end portion 21b fixed to the base lid portion 17 and the tip end portion 21a not fixed to the head portion 15.
1a and the base end portion 21b are a head portion 15 and a base lid portion 17, respectively.
It may be fixed to. Further, when the tip end portion 21a and the base end portion 21b of the taper wire 21 are fixed to the head portion 15 and the base lid portion 17, respectively, the safety wire 19 may not be arranged.

In this guide wire 11, the coil 13 has three
Since the wire is wound, the coil pitch of the individual wire rods 1, 2 and 3 becomes long, and the rotation transmissibility is improved. For this reason, when the head 15 is directed in a desired direction at a branching portion such as a blood vessel, the rotational force applied at the proximal portion is applied to the head 1.
5 can be sufficiently transmitted, and operability can be improved. In addition, the operability is further improved by appropriately bending the tip of the coil 13.

In the guide wire 11, a marker made of a material that does not transmit X-rays, such as platinum or gold, may be attached near the head 15 of the coil 13. This attachment is performed, for example, by brazing with silver solder. By thus attaching the marker impermeable to X-rays to the vicinity of the head 15 of the coil 13, the guide wire can be efficiently inserted while confirming the position of the coil tip in the blood vessel with the X-ray camera. You can work.

FIG. 2 shows another embodiment of the medical guide wire according to the present invention. The same parts as those in the embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

This guide wire 23 has three windings and three windings.
It has a coil 31 wound in a double winding. That is, as shown in FIG. 3, the coil 31 includes an outer coil 25, an intermediate coil 27, and an inner coil 29 that are concentrically stacked, and each of the coils 25, 27, and 29 is made of stainless steel. It is made of two, three, which are aligned in parallel and wound tightly. In this case, each coil 25, 27, 2
The winding directions of 9 are alternately reversed, that is, the outer coil 25 and the inner coil 29 are overlapped with the intermediate coil 27 in opposite winding directions. The safety wire 19 and the inner core wire 21 are inserted inside the guide wire 23 as in the above-described embodiment.

In this guide wire 23, as shown in FIG. 3, when a rotational force is applied to the coil 31 in the direction of the arrow A in the figure, the outer coil 25 contracts and the intermediate coil 27 expands. The inner coil 29 is reduced in diameter. For this reason,
The outer coil 25 and the intermediate coil 27 come into contact with each other, and the rotational force can be transmitted to the entire coil 31. Conversely, when a rotational force is applied in the direction of arrow B, the outer coil 25 expands in diameter, the intermediate coil 27 contracts in diameter, and the inner coil 29 expands in diameter. Therefore, the intermediate coil 27 and the inner coil 29 come into contact with each other, and the rotational force can be transmitted. When the coil is wound multiple times in this way, the rotation transmissibility can be further improved and the operability can be improved, as compared with the case where a single-turn coil is used.

In the above embodiment, a coil having three windings and three windings is used, but the present invention is not limited to this, and a coil having one winding or two windings is doubled. Alternatively, it may be triple wound.

FIG. 4 shows still another embodiment of the medical guide wire according to the present invention.

The guide wire 33 is joined to the distal end of a coil 31 in which the outer coil 25, the intermediate coil 27, and the inner coil 29, which are each wound in three strands, are stacked in three layers.
The coil 37, which is made of the same material and is wound in a single winding and a single winding, is welded through 5. In this case, at the tip of the coil 31, the inner coil 29 protrudes the longest, the end of the intermediate coil 27 is positioned next, and the end of the outer coil 25 is positioned at the foremost position. It is arranged so that the tip is gradually tapered.
Then, the coil 37, which is a single-row single-winding coil, is the inner coil 29.
Is welded to the tip of the. Single-row, single-winding coil 37
Is preferably about 20 to 50 mm, and the tip of the coil 37 is melted to form a round head 15. A safety wire and an inner core wire are inserted inside the coil 31 as in the above-described embodiment. However, the inner core wire may be inserted inside the coil 37.

In the guide wire 33, since the tip portion is formed by the coil 37 having a single winding and a single winding, good flexibility is imparted to the tip portion. Further, since the distal end portion of the coil 31 is also formed to be gradually thin, it becomes softer as it approaches the distal end of the guide wire 31.

In the above embodiment, the innermost coil of the coil having a plurality of double windings may be extended and the coil may be used as it is as the distal end portion of the guide wire.

[0030]

As described above, according to the medical guide wire of the present invention, the coil is formed into a plurality of windings and / or a plurality of multiple windings in which winding directions are alternately changed, so that the rotation transmissibility is improved. Thus, it is possible to improve the operability when the distal end of the guide wire is oriented in a desired direction at a branching portion such as a blood vessel.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the medical guide wire of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the medical guide wire of the present invention.

FIG. 3 is a three-row structure used in the medical guide wire of FIG.
It is explanatory drawing which shows the coil of heavy winding.

FIG. 4 is a vertical sectional view showing still another embodiment of the medical guide wire according to the present invention.

FIG. 5 is a vertical cross-sectional view showing an example of a conventional medical guide wire.

FIG. 6 is an explanatory view showing a state in which a medical guide wire is being guided in a desired direction at a bifurcation of a blood vessel.

[Explanation of symbols]

 11, 23, 33 Guide wire 13 Three-winding coil 31 Three-triple winding coil 37 One-fold single-winding coil 19 Safety wire 21 Inner core wire 25 Outer coil 27 Intermediate coil 29 Inner coil

Claims (3)

(57) [Scope of utility model registration request] 1. A flexible tightly wound coil, a safety wire disposed in the coil and having both ends fixed to both ends of the coil, and a distal end disposed in the coil having a tapered shape. In a medical guide wire having an inner core wire formed in the above, the coil has a plurality of windings and / or a plurality of windings in which winding directions are alternately changed to improve rotation transmissibility. Guide wire. 2. The medical guide wire according to claim 1, wherein a single-strand, single-winding coil is further joined to the distal end portion of the coil. 3. The medical guide wire according to claim 1 or 2, wherein a marker impermeable to X-rays is provided at a distal end portion of the coil.