# US 10,864,018 B2 · Method for manufacturing medical linear member

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- Number: US 10,864,018 B2
- Document ID: US10864018B2
- Status: Granted
- Kind: B2
- Application number: 15/749,804
- Filed: 2015-08-06
- Published: 2018-08-09
- Granted: 2020-12-15
- Earliest claimed: 2015-08-06
- Assignees: Syntec, Inc.
- Applicants: Syntec Corporation
- Inventors: Kazumi Akatsu; Jack C. Chang
- Web page: https://patentgrep.com/patent/US10864018B2

## CPC

- A61B 17/68: Internal fixation devices {, including fasteners and spinal fixators, even if a part thereof projects from the skin (bone staples A61B17/0642)}
- A61B 17/58: for osteosynthesis, e.g. bone plates, screws or setting implements (A61B17/14, A61B17/16 take precedence)
- A61B 17/84: Fasteners therefor {or fasteners being internal fixation devices}
- C22F 1/006: {Resulting in heat recoverable alloys with a memory effect}
- C22F 1/10: of nickel or cobalt or alloys based thereon
- A61B 2017/00526: {Methods of manufacturing}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

A method of manufacturing a medical linear member includes a step of forming a first spiral body (1) whose cross-sectional shape is a substantially perfect circular shape by spirally winding a base body (3) having a plurality of arrayed wires (2) formed of a shape memory alloy, around a winding core (4), a step of performing a first shape memory process on the first spiral body (1), a step of cutting the first spiral body (1) into a first predetermined length, a step of removing the winding core (4) from the cut first spiral body (1), a step of forming a second spiral body (6) whose cross-sectional shape is a flat shape by compressing the first spiral body (1) in a diametral direction, and a step of performing a second shape memory process on the second spiral body (6).

## Claims

### Claim 1

A method of manufacturing a medical linear member, the method comprising:
a step of forming a first spiral body whose cross-sectional shape is a perfect circular shape by spirally winding a base body having a plurality of arrayed wires formed of a shape memory alloy, around a winding core formed of a round bar, at intervals in a direction along an axial length of the winding core;
a step of performing a first shape memory process by heating the first spiral body;
a step of cutting the first spiral body into a first predetermined length;
a step of removing the winding core from the cut first spiral body;
a step of forming a second spiral body whose cross-sectional shape is a flat shape by compressing the first spiral body from which the winding core is removed, in a diametral direction of the substantially perfect circular shape; and
a step of performing a second shape memory process by heating the second spiral body.

### Claim 2 (depends on 1)

The method of manufacturing a medical linear member according to claim 1, further comprising:
a step of cutting the second spiral body subjected to the second shape memory process, into a second predetermined length.

### Claim 3 (depends on 1)

The method of manufacturing a medical linear member according to claim 1,
wherein the first spiral body is compressed by placing the first spiral body heated by the first shape memory process, on a base while a heated state is maintained, and by pressing a compression member from above.

### Claim 4 (depends on 3)

The method of manufacturing a medical linear member according to claim 3,
wherein the compression member is pressed by a spring member which biases the compression member in a direction toward the first spiral body.