JPH07194709A - Medical wire - Google Patents

Abstract

PURPOSE:To suitably hold the medical wire at the diseased part, to simplify a holding operation and to hold it over and over again by restoring the original shape part of a original shape wire inside a scabbard tube into its original shape when it is pushed out, almost linearly extending the original shape part when it is pulled into the tip part of the scabbard tube, and housing it inside the scabbard tube. CONSTITUTION:Concerning the medical wire, the original shape wire and a guide wire 10 are housed in a passage for original shape wire and a passage for guide wire respectively and the original shape wire is made linear from the hand part almost up to the tip but originally formed into the shape of a helical coil at the tip part. Then, this original shape wire is formed from a superelastic material and when an original shape wire base 9 is pushed into a scabbard tube 5 and the helical coil 7 at the tip of the original shape wire is protruded from the top of the scabbard tube 5, the tip part of the original shape wire is restored into the helical coil 7. When the original shape wire base 9 is separated from a Y-shaped connector 3, the helical coil 7 and a platina ball 8 enters the head of the scabbard tube 5, and the tip part is deformed from the helical shape to the linear shape and pulled in.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical wire which is left in an affected area for a certain period of time to achieve a medical action.

[0002]

2. Description of the Related Art Conventionally, a jig having a predetermined shape used for stabilizing the shape of an affected area by being placed in the affected area, for example, in the case of stenosis of a heart artery, restenosis when the stenosis area is expanded with a balloon. In order to prevent this, a spiral coiled stent that supports the blood vessel wall so as not to cause restenosis of the blood vessel wall while passing the blood flow is placed in the expanded affected area. In this case, the spiral coil is carried to the affected area by the catheter, and then pushed out of the catheter and placed there.However, it is difficult to just fit the spiral coil to a predetermined place by remote control from outside the body. Once accidentally pushed out of the catheter, it cannot be replaced in the affected area. Further, the spiral coil once placed cannot be taken out. Further, in-body indwelling jigs such as filters are also used. In many cases of these indwelling jigs, such indwelling jigs are stable for a certain period of time, for example, several hours to several days, and the affected area is stable. The symptoms do not recur.
Therefore, as a general rule, unnecessary jigs should be removed after the symptoms have stabilized.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a medical wire in which a medical wire can be placed appropriately on an affected area, the placement operation is simple, it can be replaced many times, and it can be easily taken out of the body. The purpose is to provide a wire for use.

[0004]

Means for Solving the Problems As a result of intensive investigations by the present inventors, first of all, in many cases, a medical wire is often left in the body for about 20 to 30 days, and as a medical wire. Focusing on the fact that the role can be achieved, and even if it is removed after that, it does not affect the affected part, extend one end of the medical wire outside the body, protect it with a sheath tube, and operate this extended end It was found that the affected area can be stabilized by removing the sheath tube outside the body and leaving only the medical wire inside the body, and can be easily removed from the body after stabilization of the affected area. The present invention has been completed based on the findings. That is, the present invention mainly has the following aspects. (1) A medical wire comprising a wire having at least a distal end shaped into a predetermined shape and a sheath tube having a through passage for accommodating the wire, wherein the shaping portion of the shaping wire is inside the sheath tube. When the shape-imparting portion is restored to the shape-imparting shape when it is extruded, and when the shape-imparting wire shape-forming portion is pulled into the sheath tube distal end by pulling from the proximal end of the sheath tube, the shape-imparting portion is almost A medical wire that extends linearly and is stored in a sheath tube. (2) The medical wire according to item 1, wherein the sheath tube is provided with a through passage for a guide wire. (3) The medical wire according to item 1 or 2, wherein the shaping wire is made of a superelastic material, a shape memory material or an amorphous material.

The medical wire of the present invention comprises a shaped wire and a sheath tube for accommodating the shaped wire. The shaped wire used in the present invention is a wire in which at least the tip portion has a shape suitable for the symptoms of the affected area, and the wire has a length extending from the shaped portion to the outside of the body. The sheath tube used in the present invention has a through hole having an inner diameter slightly larger than the diameter of the wire, and has a length that extends from the affected part to the outside of the body and is slightly shorter than the shaping wire. In the medical wire of the present invention, at least the tip portion of the shaping wire is shaped so as to have a shape suitable for a predetermined affected area when no force is applied. Therefore, when the shaping portion of the shaping wire is in the sheath tube, the shaping portion of the shaping wire has a substantially linear shape,
When it is pushed out of the sheath tube, it immediately returns to the desired shape. When pulling the tip of this shaped shape with the force from the opposite end of the sheath tube and pulling it into the sheath tube, the predetermined shaped shape can be easily linearized by the edge of the tip of the sheath tube with a small diameter. It is extended and stored in the sheath tube. Even if the shaping wire is largely deformed from the shaping shape, it is necessary to surely and promptly restore the shape to the original shape. In the case of ordinary stainless steel or the like, when the shaping shape of the shaping wire greatly differs from the linear shape by a certain amount or more, linear deformation remains and the shaping shape cannot be completely restored. In the case of a shaped shape that is significantly different from the linear shape, a superelastic material, an amorphous material, or a shape memory material is preferable. As the superelastic material, the amorphous material or the shape memory material, those having a known composition can be used without particular limitation. Super elastic material,
As the shape memory material, titanium-nickel alloy, Ti-
Ni-based alloy, Ni-Ti-Co-based alloy, Cu-Zn-A
Known superelastic alloys or shape memory alloys such as 1-based alloys, Cu-Ni-Al-based alloys and Fe-Mn-based alloys can be used, and these known amorphous materials can also be used.

A shaping wire made of a superelastic material, a shape memory material, or the like has a shape which is greatly different from a linear shape, and the shaping wire has a large curvature even if each shaping part has a considerably large curvature. The wire can be shaped into various shapes within a range in which the wire is not entangled at the edge of the tip of the sheath tube when pulled by the drawing force from the direction. The shaping part of these shaping wires has a spiral coil,
A known jig to be placed such as a thrombus filter, which is shaped into a shape that can be substituted, is used. The shape of this shaping needs to be such that when the shaping wire is pulled from the other end of the sheath tube, the curved shape is linearly extended at the edge of the sheath tube and smoothly slides into the sheath tube. . Since the shaping wire used in the present invention is left in the body for several hours or longer, it is desirable to carry out polymer coating so that a trace amount of harmful metal ions is not eluted from the shaping wire. Furthermore, it is desirable to coat this polymer with an antithrombotic polymer. As the antithrombogenic polymer material, a known anticoagulant fixing material such as polyurethane coating, polyurethane copolymer coating, hydrophilic polymer coating, or thrombus solvent fixing material can be used. Also,
Prevents body tissues from being infected with pathogenic bacteria during indwelling by coating the surface of the shaped wire with a substance containing silver, copper, etc. or antibacterial ceramics containing silver, copper, etc. by deposition, ion implantation method, and attachment can do. Regarding the antibacterial property of the shaped wire, it is convenient to incorporate an antibacterial agent into the polymer during the polymer coating. As the antibacterial agent, for example, a known antibacterial agent such as sulfur diazide silver can be used. It is desirable to attach an X-ray opaque material to a part of the shaping portion of the shaping wire. For example, by connecting a platinum ball or coil to the tip of the tip of the shaping wire, the position of the tip of the shaping wire in the body can be clearly understood.

The sheath tube used in the present invention has a passage that penetrates the sheath tube having an inner diameter slightly larger than the diameter of the shaping wire in the longitudinal direction, and the material is not particularly limited as long as it is usually used for a catheter. For example, a resin or metal sheath tube having appropriate hardness and flexibility can be used, and a resin one is particularly preferable. In order to make the shaping wire slide smoothly, it is desirable that the passage of the resin sheath tube is subjected to a friction reducing treatment, for example, a hydrophilic polymer coating, a silicone coating, a fluorine coating or the like. The shaped part of the shaped wire is
Although it is almost linearly accommodated in the through passage of the sheath tube, when it is pushed out from the tip of the sheath tube with the tip of the sheath tube reaching the affected area, it is restored to a pre-shaped shape and the affected area is restored. Is installed in. After installation, as a general rule, the shaping wire is left indwelling, and only the sheath tube is slowly pulled out of the body. Then, after the indwelling, when the state of the affected area becomes stable after several hours to 30 days, the indwelling shaped wire is transmitted, the sheath tube is inserted to the affected area, and first, only the shaped wire is pulled out. The shaped portion is again straightened into the sheath tube and extracted. By thus storing and extracting in the sheath tube, the shape of the shaped portion does not damage the internal tissue. In the sheath tube used in the present invention, it is desirable that a through passage for a guide wire that runs in parallel with this passage be separately provided outside the through passage for passing the shaping wire. By providing the guide wire passage in the sheath tube, the setting operation of the shaping wire can be facilitated. That is, first, after inserting the guide wire to the affected area, the sheath tube alone or the sheath tube accommodating the shaping wire can be inserted to the affected area using the guide wire as a guide. At this time, there is an advantage that the shaped portion of the shaping wire can be pushed out while securing the tip of the sheath tube at an appropriate position of the affected area with the guide wire. On the proximal side of the shaped wire passage of the sheath tube used for the medical wire of the present invention or the guide wire passage, a known Y-type connector and a hemostatic valve should be installed for each wire without causing blood leakage. It is desirable because it can be freely taken in and out.

[0008]

The present invention will now be described in more detail with reference to the drawings of the embodiments. As shown in FIG. 3, the sheath tube of the medical wire of the present invention of FIG.
A passage 11 for a guide wire and a passage 12 for a guide wire 10 pass through, and a shaping wire tube 1 and a guide wire tube 2 are provided on the proximal side of the passage.
Y-type connectors 3 and 4 with a hemostatic valve are connected to the tips of these tubes, respectively. The Y-shaped connectors 3 and 4 can prevent blood from leaking during operation, and can inject a chemical solution, water or the like. In the medical wire of the present embodiment of FIG. 1, the shaping wire 6 and the guide wire 10 are housed in the shaping wire passage 11 and the guide wire passage 12, respectively. The shaping wire 6 of this embodiment in FIG. 2 is a linear wire from the proximal portion to the vicinity of the tip, but the tip portion is shaped like a spiral coil. The shaping wire 6 is made of a super elastic material. When the shaping wire base portion 9 is pushed into the sheath tube 5 and the spiral coil 7 at the tip of the shaping wire 6 is projected from the tip of the sheath tube 5, the tip portion of the shaping wire 6 becomes a spiral coil 7 as shown in FIG. Restore to. When the shaping wire base 9 is separated from the Y-type connector 3, the spiral coil 7 and the platinum ball 8 at the tip end enter into the tip end portion of the sheath tube 5. At this time, the tip is deformed from the spiral shape to a linear shape and is drawn.

When the medical wire of this embodiment is used, for example, to treat stenosis of arterial blood vessels of the heart, first the guide wire 10 is inserted to the affected area, and the balloon catheter is inserted to the affected area using this as a guide. Inflate the balloon to dilate the affected area. Then, the balloon catheter is pulled out, and the proximal end of the guide wire 10 that is left inside the body is inserted into the guide wire passage 12 of the sheath tube of this embodiment, and the sheath tube containing the shaping wire 6 is transmitted along the guide wire 10. Insert 5 into the stenosis of the affected area up to the position of the expanded affected area. Next, when the shaping wire base portion 9 is pushed in to project the tip end portion of the shaping wire 6 from the sheath tube 5, the spiral coil 7 is restored to the affected area, and the expanded blood vessel portion has a role of supporting the restenosis. Fulfill. Next, the guide wire 10 and the sheath tube 5 are removed and only the shaping wire 6 is left in the body. When removing the shaping wire 6 left indwelling after a predetermined period of time, first insert the shaping wire 6 into the shaping wire passage 11 and use the shaping wire 6 as a guide to guide the distal end of the sheath tube 5. The spiral coil 7 is reached.
Next, when the shaping wire base portion 9 is pulled out from the Y-shaped connector 3, the distal end portion is deformed linearly and stored in the sheath tube 5. In this state, if the shaping wire 6 is housed in the sheath tube 5 and then withdrawn, the spiral coil 7 does not damage the internal tissue.

[0010]

The medical wire of the present invention has the advantage that it can be installed in a precise position to be left in the body and can be replaced if desired. Moreover, after achieving the purpose of indwelling in the body, it can be removed by a simple operation.

[Brief description of drawings]

FIG. 1 is a side view of a medical wire according to an embodiment of the present invention.

FIG. 2 is a side view of the shaped wire of the medical wire according to the present invention.

FIG. 3 is a cross-sectional view showing the state of the sheath tube at the tip of the medical wire according to the embodiment of the present invention.

[Explanation of symbols]

 1 Tube for shaped wire 2 Tube for guide wire 3, 4 Y-type connector 5 Sheath tube 6 Shaped wire 7 Spiral coil 8 Platinum ball 9 Shaped wire base 10 Guide wire 11 Shaped wire passage 12 Guide wire passage

Claims (3)

[Claims] 1. A medical wire comprising a wire having at least a distal end shaped into a predetermined shape and a sheath tube having a through passage for accommodating the wire, wherein the shaped wire in the sheath tube is shaped. When the shaped portion is extruded, the shaped portion is restored to the shaped shape, and when the shaped wire shaped portion is pulled into the sheath tube distal end portion by pulling from the proximal end of the sheath tube,
A medical wire characterized in that the shaped part extends substantially linearly and is housed in a sheath tube. 2. The medical wire according to claim 1, wherein the sheath tube is provided with a through passage for a guide wire. 3. The medical wire according to claim 1, wherein the shaping wire is made of a superelastic material, a shape memory material or an amorphous material.