Guide wire for medical use

A medical and guide wire technology, applied in the field of medical guide wires, can solve the problems of poor indentation and bending rigidity (low kink resistance of the guide wire, etc.), and achieve good torque transmission, high bending rigidity, maintaining Excellent effect

Active Publication Date: 2013-10-16
JAPAN LIFELINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the bending rigidity (kink resistance) of the thin guide wire is low, and the press-fit property is also poor.

Method used

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  • Guide wire for medical use
  • Guide wire for medical use
  • Guide wire for medical use

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0096] Figure 1 ~ Figure 3 The shown medical guide wire of this embodiment is a medical guide wire having a core wire 10 made of austenitic stainless steel with a tensile strength of 2600 to 3000 MPa and a coil spring 20, and It has a proximal end side large diameter portion 13 with an outer diameter of 0.012 inches or more, a distal end side small diameter portion 11 with an outer diameter smaller than the proximal end side large diameter portion 13, a proximal end side large diameter portion 13 and a distal end side large diameter portion 11. The tapered portion 12 between the small-diameter portions 11 on the end side, the coil spring 20 is composed of a coil that is axially installed on the outer circumference of the small-diameter portion 11 at the distal end side of the core wire 10 and has a coil diameter 1.1 to 2.0 times the coil wire diameter. The pitched densely wound portion 201 and the thickly wound portion 202 continuous with the densely wound portion 201 and hav...

no. 2 approach ＞

[0201] Figure 6 The guidewire shown has a core wire 10 and a coil spring 20B.

[0202] The core wire 10 has a small-diameter portion 11 on the distal end side tapered to increase in diameter in the proximal direction, a tapered portion 12 enlarged in the proximal direction, and a large-diameter portion 13 on the proximal end side.

[0203] The small-diameter portion 11 at the distal end, the tapered portion 12 and the large-diameter portion 13 at the proximal end are integrally formed of the same wire material (for example, a round rod member).

[0204] The cross-sections of the tapered portion 12 and the large-diameter portion 13 at the proximal end are substantially circular.

[0205] The proximal end side of the small-diameter portion 11 on the distal end side has a substantially circular cross-section, but the distal end side of the small-diameter portion 11 on the distal end side can also be formed into a plate shape by compressing a wire rod. In this case, the cross-se...

no. 3 approach ＞

[0270] Figure 9 The guidewire shown has a core wire 10 and a coil spring 20C.

[0271]The core wire 10 has a small-diameter portion 11 on the distal end side tapered to increase in diameter in the proximal direction, a tapered portion 12 enlarged in the proximal direction, and a large-diameter portion 13 on the proximal end side.

[0272] The small-diameter portion 11 at the distal end, the tapered portion 12 and the large-diameter portion 13 at the proximal end are integrally formed of the same wire material (for example, a round rod member).

[0273] The cross-sections of the tapered portion 12 and the large-diameter portion 13 at the proximal end are substantially circular.

[0274] The cross-section of the proximal end side of the small-diameter portion 11 on the distal end side is substantially circular, but the distal end side of the small-diameter portion 11 on the distal end side may also be in the form of a plate formed by compressing a wire rod. In this case, the c...

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Abstract

A guide wire for medical use is provided with a coil spring (20) mounted on a distal end side small diameter part (11) of a core wire (10) formed of austenitic stainless steel with a tensile strength of 2600 to 3000 MPa. The coil spring (20) has a tip end side small diameter part (21), a first taper part (22), a middle diameter part (23), a second taper part (24) and a back end side large diameter part (25). A closely coiled portion (201) is formed by the tip end side small diameter part (21), first taper part (22), middle diameter part (23) and second taper part (24), and a loosely coiled portion (202) is formed by the back end side large diameter part (25). The tip end portion of the tip end side small diameter part (21), the back end portion of the second taper part (24) and the back end portion of the back end side large diameter part (25) are affixed to the outer periphery of the distal end side small diameter part (11) of the core wire (10). This guide wire is capable of passing through even constricted areas, has high flexural rigidity, and also has exceptional push-in properties, torque conveyance properties and shape stability properties.

Description

technical field [0001] The present invention relates to a medical guide wire in which a coil spring is attached to the outer periphery of a small-diameter portion on the distal end side of a core wire. Background technique [0002] A guide wire for guiding a medical device such as a catheter to a predetermined position in a body cavity such as a blood vessel requires flexibility at a distal end. [0003] Thus, there is known a guide wire in which the outer diameter of the distal end of the core wire is smaller than the outer diameter of the proximal end, and the outer diameter of the distal end of the core wire (the small-diameter portion on the distal end side) is A coil spring is attached to improve the flexibility of the distal end (for example, refer to Patent Document 1). [0004] In order to attach the coil spring to the outer periphery of the small-diameter portion on the distal end side of the core wire, usually, the front end and the rear end of the coil spring are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M25/01A61L31/00
CPCA61M2025/09175A61M2025/09083A61M2025/09133A61M25/09
Inventor 河崎浩范
Owner JAPAN LIFELINE CO LTD
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