# US 11,432,808 B2 · Guide wire

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- Number: US 11,432,808 B2
- Document ID: US11432808B2
- Status: Granted
- Kind: B2
- Application number: 16/846,445
- Filed: 2020-04-13
- Published: 2020-07-30
- Granted: 2022-09-06
- Earliest claimed: 2017-10-12
- Assignees: Asahi Intecc Co., Ltd.
- Applicants: Asahi Intecc Co., Ltd.
- Inventors: Kenta Tsuge; Ayuko Miyata
- Web page: https://patentgrep.com/patent/US11432808B2

## CPC

- A61B 17/00234: {for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)}
- A61M 25/09: Guide wires
- A61B 17/12022: {Occluding by internal devices, e.g. balloons or releasable wires (plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20)}
- A61B 2017/00305: {Constructional details of the flexible means}
- A61B 2017/00331: {with preformed bends}
- A61B 2017/00336: {with a protective sleeve, e.g. retractable or slidable}
- A61B 2017/1205: {Introduction devices}
- A61M 2025/09083: {having a coil around a core}
- A61M 2025/0915: {having features for changing the stiffness}
- A61M 2025/09175: {having specific characteristics at the distal tip}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A guide wire of the present disclosure includes a core shaft having a distal end portion reducing in diameter, a coil body wound to cover the distal end portion, and a distal end fixing portion fixing the core shaft and the coil body to each other. The distal end portion includes a small diameter portion, a large diameter portion, and a tapered portion between the small diameter portion and the large diameter portion. The core shaft and the coil body are fixed at a portion excluding the tapered portion. A first bending rigidity FR1 of the large diameter portion, a second bending rigidity FR2 of the small diameter portion, and a length L of the tapered portion satisfy the following expressions (1) and (2). In the following expressions (1) and (2), the unit of L is mm (millimeter). FR1/FR2≥10 (1) 1≤L≤3 (2)

## Claims

### Claim 1

A guide wire, comprising:
a core shaft that includes a distal end portion stepwisely decreasing in diameter toward a distal end direction;
a coil body wound to cover at least a part of an outer periphery of the diameter-decreased distal end portion; and
a distal end fixing portion that fixes the distal end of the core shaft and a distal end of the coil body to each other, wherein
the distal end portion of the core shaft includes:
a small diameter portion adjacent to the distal end fixing portion,
a large diameter portion that is positioned further in a proximal end direction than the small diameter portion and has a larger diameter than the small diameter portion, and
a tapered portion between the small diameter portion and the large diameter portion, the tapered portion gradually increasing in diameter from the small diameter portion toward the large diameter portion,
the core shaft and the coil body are fixed at a portion of the core shaft excluding the tapered portion, and
a first bending rigidity FR1 of the large diameter portion, a second bending rigidity FR2 of the small diameter portion, and a length L of the tapered portion in an axial direction of the core shaft satisfy the following expressions (1) and (2):
FR1/FR2≥10 (1)
1≤L≤3 (2)
(in the above expressions (1) and (2), the unit of L is mm (millimeter)).

### Claim 2 (depends on 1)

The guide wire according to claim 1, further comprising:
an inner coil body that is a multiple spiral coil inside the coil body so as to cover the core shaft, wherein
the core shaft and the inner coil body are fixed at a region excluding the tapered portion, the region being on the core shaft in a proximal end direction from the tapered portion, and the distal end fixing portion.

### Claim 3 (depends on 2)

The guide wire according to claim 2, wherein at least one of the coil body and the inner coil body has a higher bending rigidity in the proximal end direction than in the distal end direction of the tapered portion in the axial direction of the core shaft.

### Claim 4 (depends on 2)

The guide wire according to claim 2, wherein at least one of the coil body and the inner coil body has different wire diameters before and after the tapered portion.

### Claim 5 (depends on 2)

The guide wire according to claim 2, wherein the core shaft includes a core shaft main body and a connection portion between the core shaft main body and the large diameter portion, and the core shaft and the inner coil body are fixed at the connection portion.

### Claim 6 (depends on 1)

The guide wire according to claim 1, wherein the core shaft includes a core shaft main body and a connection portion between the core shaft main body and the large diameter portion, and the core shaft and the coil body are fixed at the connection portion.

### Claim 7 (depends on 1)

The guide wire according to claim 1, wherein the coil body has a higher bending rigidity in the proximal end direction than in the distal end direction of the tapered portion in the axial direction of the core shaft.

### Claim 8 (depends on 1)

The guide wire according to claim 1, wherein the coil body has different wire diameters before and after the tapered portion.