# US 10,245,060 B2 · Edged medical cutting tool

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- Number: US 10,245,060 B2
- Document ID: US10245060B2
- Status: Granted
- Kind: B2
- Application number: 14/940,318
- Filed: 2015-11-13
- Published: 2016-03-10
- Granted: 2019-04-02
- Earliest claimed: 2010-09-28
- Assignees: Mani, Inc.
- Applicants: Mani, Inc.
- Inventors: Kazuaki Kato
- Web page: https://patentgrep.com/patent/US10245060B2

## CPC

- A61B 17/32: Surgical cutting instruments ({A61B18/042 takes precedence; suture cutters A61B17/0467;} implements for ligaturing and cutting {A61B17/122, A61B17/12; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133})
- A61B 17/06066: {Needles, e.g. needle tip configurations}
- A61B 17/3211: Surgical scalpels, knives; Accessories therefor
- C25F 3/24: of iron or steel
- A61B 2017/00526: {Methods of manufacturing}
- A61F 9/0133: {Knives or scalpels specially adapted therefor}
- A61F 2250/005: differing in colour
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- C25F: PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

[Problem] To provide a medical cutting tool with low impalement resistance. [Solution] The edged medical cutting tool comprising a knife, trocar or cutting suture needle has a sharp edge (1) for incising living tissue and a flat part (2) that configures the edge, and the color of the portion of the flat part (2a) along the edge (1) differs from the color of the rest of the flat part (2b). The difference in color results from a difference in the thickness of an oxide film. Another edged medical cutting tool is configured of austenite stainless steel and has a sharp edge (1) for incising living tissue and a flat part (2) that configures the edge. The chrome content of the portion of the flat part (2a) along the edge is higher than the chrome content of the rest of the flat part (2b).

## Claims

### Claim 1

A method of producing a medical cutting tool for incising a biological tissue, the medical cutting tool being made of austenitic stainless steel, the method comprising the steps of:
forming a medical cutting tool having a cutting edge and plane portions that form the cutting edge press working;
performing an electrolytic polishing to the medical cutting tool formed by press working;
detecting by quantitative analysis using X-ray analysis, after the electrolytic polishing, a first chromium content per unit mass of an area of the plane portions which is adjacent to the edge and a second chromium content per unit mass of the other area on the plane portions which is not adjacent to the edge; and
determining that the cutting edge has sufficient sharpness when the first chromium content per unit mass is larger than the second chromium content per unit mass.