JP2002143320A - Guide wire - Google Patents

Abstract

(57) [Problem] To provide a guide wire capable of reducing torque transmission loss. A primary coil (3) made of a contrast material and a secondary coil (4) made of a non-contrast material are inserted into a front portion (2F) of a core wire (2), and the primary coil (3) and the secondary coil (4) are inserted. The guide wires 1, 1A, 1B, and 1C in which the secondary coil 4 is loosely fitted to the front portion 2F of the core wire 2 without directly bonding the ends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a guide wire used for introducing a balloon catheter used for percutaneous coronary angioplasty (PTCA) into a blood vessel, for example. In particular, the present invention relates to a guide wire that does not cause loss of torque transmission to the distal end.

[0002]

2. Description of the Related Art FIG. 5 is a schematic view showing an example of a conventional guide wire 11.
The guide wire 11 is a front portion 12F of the core wire 12.
Then, a primary coil 13 made of a contrast material and a secondary coil 14 made of a non-contrast material are connected by welding, soldering, brazing, etc. by butt (in the figure, S is a connecting portion) and are substantially continuous. It was inserted as a single coil. Therefore, when the coil portions 13 and 14 are inserted into a narrowed portion of a curved blood vessel, the substantially continuous single coil becomes a resistance, and a loss of torque transmission occurs in the front portion 12F of the core wire 12. Had occurred. The inventor of the present invention has made intensive studies in order to solve the above-mentioned problems, and as a result, has arrived at the next invention.

[0003]

Means for Solving the Problems [1] In the present invention, a primary coil 3 made of a contrast material is provided on a front portion 2F of a core wire 2.
And the secondary coil 4 made of a non-contrast material is inserted into the core wire 2 without directly bonding the ends of the primary coil 3 and the secondary coil 4 to each other. The guide wires 1, 1A, 1B, and 1C loosely fitted to the front portion 2F of the vehicle. [2] The present invention is configured by inserting a primary coil 3 made of a contrast material, a secondary coil 4 and a tertiary coil 5 made of a non-contrast material into a front portion 2F of the core wire 2, and And, the guide wires 1, 1A, 1B, 1C are provided in which the end of the secondary coil 4 is not directly bonded to the end of the tertiary coil 5. [3] In the present invention, a welded portion 6 is formed at both ends or one end of the primary coil 3 and the tertiary coil 5 [1].
Or guide wires 1, 1A, 1B according to [2].
1C is provided. [4] The present invention covers a sleeve 7 between both ends of the secondary coil 4 and each end of the primary coil 3 and the tertiary coil 5 facing the both ends, [1] Or a guide wire 1B according to [2]. [5] A tapered portion 4C is formed at both ends of the secondary coil 4, and tapered portions 3C and 6C are formed at respective ends of the primary coil 3 and the tertiary coil 5 opposed to both ends. Then, the connecting pipe 7C1 was mounted around the outer circumferences of the narrowing section 3C and the narrowing section 4C, and the connecting pipe 7C2 was mounted over the outer circumferences of the narrow diameter section 6C and the narrowing section 4C. ] To [3]. [6] The present invention relates to the tapered portion 3C and the connection pipe 7C1.
And the narrowed portion 6C and the connection pipe 7C
2. The guide wire 1 according to [5], wherein the narrowed portion 4C and the connection pipe 7C2 are welded together with the narrowed section 4C and the connection pipe 7C1.
Provide C. [7] In the present invention, the connection pipe 7C1 is made of a contrast material,
The guide wire 1C according to [5] or [6], wherein the connection pipe 7C2 is made of a non-contrast material. [8] In the present invention, a tubular member made of a non-contrast material is disposed in place of the secondary coil 4 made of the non-contrast material, [1]
Or guide wires 1, 1A, 1B according to [7],
1C is provided.

[0004]

1 to 4 are schematic views showing one example of a guide wire according to the present invention. The guide wires 1, 1A, 1B, and 1C of the present invention are configured by inserting a primary coil 3 made of a contrast material and a secondary coil 4 made of a non-contrast material into a front portion 2F of the core wire 2. .
The ends of the primary coil 3 and the secondary coil 4 are
The secondary coil 4 is loosely fitted to the front portion 2F of the core wire 2 without directly bonding. More specifically, a primary coil 3 made of a contrast material, a secondary coil 4 and a tertiary coil 5 made of a non-contrast material are fitted into a front portion 2F of the core wire 2, and the primary coil 3 and the Without directly bonding the end of the secondary coil 4 to the end of the tertiary coil 5, the secondary coil 4 is
It is loosely fitted to the front portion 2F of the core wire 2 and is loosely fitted between the primary coil 3 and the tertiary coil 5.

More specifically, FIG. 1 shows that a primary coil 3 made of a contrast material, a secondary coil 4 and a tertiary coil 5 made of a non-contrast material are inserted into a front portion 2F of the core wire 2, and the primary coil 3 and the tertiary coil 3 are inserted. It is the schematic of the guide wire 1 (during manufacture) in which one end of each coil 5 was welded and fixed to the front part 2F of the core wire 2. In the figure, reference numeral 6 denotes a weld. FIG. 2 shows a guide wire 1A in which one end of each of the primary coil 3 and the tertiary coil 5 (secondary coil 4 side) is welded and fixed from the state of FIG.
It is the schematic of (finished product). In the figure, reference numeral 6 denotes a weld.
FIG. 3 shows a state in which both ends of the secondary coil 4 and the respective welds 6 of the primary coil 3 and the tertiary coil 5 opposed thereto are welded and fixed from the state of FIG. Guide wire 1 covered with sleeve 7 between its ends
It is the schematic of B (completed product). FIG. 4 shows that tapered portions 4C are formed at both ends of the secondary coil 4, and tapered portions 3C and 6C are respectively formed at the respective ends of the primary coil 3 and the tertiary coil 5 facing these both ends. Formed and the narrowed portion 3C
And a guide wire 1C having a connecting pipe 7C1 mounted around the outer circumference of the narrowing section 4C and a connecting pipe 7C2 mounted over the outer circumference of the narrowing section 6C and the narrowing section 4C.
It is the schematic of (finished product).

In the guide wire 1A shown in FIG. 2, both ends of the primary coil 3 are fixed by welding portions 6 from the front end 2ST of the front portion 2F of the core wire 2 to the front of the small diameter portion S. Both ends of the tertiary coil 5 are also fixed to the large-diameter portion 2L of the front portion 2F of the core wire 2 by welding portions 6. Further, in the guide wire 1B of FIG. 3, in order to further eliminate a step between the coils 3, 4, and 5, both ends of the secondary coil 4 and the primary coil 3 and the tertiary coil opposed to both ends thereof. Between each end of the sleeve 5, a sleeve 7 is covered. Further, in the guide wire 1C of FIG. 4, as another form for eliminating a step between the coils 3, 4, and 5, a tapered portion 4C is formed at both ends of the secondary coil 4, and both ends are formed. At each end of the primary coil 3 and the tertiary coil 5 opposing to each other, tapered portions 3C and 6C are formed, respectively.
C and a connecting pipe 7C1 made of a contrast agent is mounted around the outer circumference of the narrowed portion 4C, and a connecting pipe 7 made of a non-contrast agent material is mounted over the thinned portion 6C and the outer circumference of the thinned portion 4C.
C2 is installed. Simply the narrow portion 3C and the small diameter portion 4C
Even if only the connection pipes 7C1 and 7C2 are covered over the outer circumferences of the narrowing portion 6C and the small diameter portion 4C, the secondary coil 4 is connected to the primary coil 3 and the tertiary coil 5C.
Can be loosely fitted between the small diameter portion 3C and the connection pipe 7C1 and the small diameter portion 6C and the connection pipe 7C2. The connecting pipe 7C1 and the narrowing section 4C and the connecting pipe 7C2 are not welded respectively), or the narrowing section 4C and the connecting pipe 7C1 are welded and the narrowing section 4C and the connecting pipe 7C2 are welded. By doing so (in this case, the narrow portion 3C and the connecting tube 7C1 and the narrow portion 6C and the connecting tube 7C2 are not welded, respectively), the secondary coil 4 is connected to the primary coil 3C.
And the tertiary coil 5 can be loosely fitted. In this embodiment, the welding includes means such as welding, soldering, and brazing.

In the present invention, the core wire 2 is made of a flexible metal such as stainless steel, Ni-Ti, Cu-Mn-Al alloy, and the front portion 2F has a large diameter portion as shown in FIG. 2L, medium diameter part 2M, small diameter part 2S, tip part 2ST
May be formed continuously (a continuous taper T may be interposed or a step may be formed as necessary), or a continuous taper may be formed. good. In the present invention, the primary coil 3 made of a contrast material (or also referred to as a radiopaque material) is, for example, a platinum-nickel alloy, gold, platinum, tantalum, tungsten, iridium, rhenium, lead, or an alloy of these materials. The secondary coil 4 and the tertiary coil 5 made of a non-contrast material (or also referred to as a radiation transmitting material) are made of, for example, stainless steel (for example, SUS31).
Austenitic stainless steel such as No. 6 or SUS304) or a metal material having physical properties equivalent thereto. The guide wires 1, 1A, 1B, 1
In C, instead of the secondary coil 4 made of the non-contrast material,
A tubular member made of a non-contrast material can be arranged. The “tubular member” is made of a metal material substantially equivalent to the secondary coil 4 made of the non-contrast material, and any material that performs the same function can be adopted.

In the present invention, the ends of the primary coil 3 and the secondary coil 4 (the ends of the primary coil 3 and the tertiary coil 5 and the end of the secondary coil 4) are "without direct bonding". Means that welding, soldering, brazing, etc. by butt is not performed as in the related art, and the secondary coil 4 is connected to the front portion 2F of the core wire 2 (the secondary coil 4 is connected to the primary “Freely fitting” between the coil 3 and the tertiary coil 5 means that the degree of freedom at both ends of the secondary coil 4 is secured and the outer periphery of the front portion 2F of the core wire 2 can be rotated. In the present invention, the sleeve 7
Is a synthetic resin tube, a heat shrink tube, etc.
The connection pipes 7C1 and 7C2 are annular pipes and the like,
The connection pipe 7C1 made of the contrast material is connected to the primary coil 3
A metal material substantially equivalent to that of the secondary coil 4 is used for the connection pipe 7C2 made of the non-contrast material.

[0009]

The guide wire 1, 1A of the present invention
1B and 1C, since the secondary coil 4 is loosely fitted to the front portion 2F of the core wire 2 without directly adhering to the primary coil 3, each coil 3, 4, 5 is trapped in the constriction. However, transmission loss of torque can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a guide wire according to the present invention.

FIG. 2 is a schematic view of a guide wire according to the present invention.

FIG. 3 is a schematic view of a guide wire according to the present invention.

FIG. 4 is a schematic view of a guide wire according to the present invention.

FIG. 5 is a schematic view of a conventional guide wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Guide wire 2 Core wire 2F Front part 2B Base end 2L Large diameter part 2M Medium diameter part 2S Small diameter part 2ST Tip part 3 Primary coil 4 Secondary coil 5 Tertiary coil 6 Welding part 7 Sleeve 7C1 , 7C2 connecting pipe T taper

Claims (8)

[Claims] 1. A primary coil 3 made of a contrast material and a secondary coil 4 made of a non-contrast material are inserted into a front portion 2F of a core wire 2, and the primary coil 3 and the secondary coil 4 are inserted. Guide wires 1, 1A, 1B, and 1C, wherein the secondary coil 4 is loosely fitted to the front portion 2F of the core wire 2 without directly bonding the ends of the guide wires. 2. A primary coil 3 made of a contrast material, a secondary coil 4 and a tertiary coil 5 made of a non-contrast material are fitted into a front portion 2F of the core wire 2, and the primary coil 3 and the The guide wires 1, 1A, 1B, and 1C, wherein the end of the secondary coil 4 is not directly bonded to the end of the tertiary coil 5. 3. The guide wire 1, 1A, 1B according to claim 1, wherein welds 6 are formed at both ends or one end of the primary coil 3 and the tertiary coil 5. , 1C. 4. A sleeve 7 is provided between both ends of said secondary coil 4 and each end of said primary coil 3 and said tertiary coil 5 facing said both ends. The guide wire 1 according to claim 1 or claim 2.
B. 5. A tapered portion 4C is formed at both ends of the secondary coil 4, and tapered portions 3C, 6 are respectively formed at each end of the primary coil 3 and the tertiary coil 5 opposed to both ends.
C is formed, and the connection pipe 7C1 is mounted over the outer circumference of the narrowing section 3C and the narrowing section 4C, and the connection pipe 7C2 is mounted over the outer circumference of the narrowing section 6C and the narrowing section 4C. The guide wire 1C according to any one of claims 1 to 3, characterized in that: 6. A process for welding the narrow portion 3C and the connecting tube 7C1 and for welding the narrow portion 6C and the connecting tube 7C2, or for welding the narrow portion 4C and the connecting tube 7C.
1 and the narrowed portion 4C and the connection pipe 7
The guidewire 1C according to claim 5, wherein C2 is welded. 7. The guide wire 1C according to claim 5, wherein the connection pipe 7C1 is made of a contrast material, and the connection pipe 7C2 is made of a non-contrast material. 8. The guide wire 1, 1A according to claim 1, wherein a tubular member made of a non-contrast material is arranged in place of the secondary coil 4 made of the non-contrast material. , 1B, 1C.