# US 11,304,849 B2 · Knife for use in medical treatment

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,304,849 B2
- Document ID: US11304849B2
- Status: Granted
- Kind: B2
- Application number: 16/325,722
- Filed: 2017-08-24
- Published: 2021-10-28
- Granted: 2022-04-19
- Earliest claimed: 2016-08-29
- Assignees: Mani, Inc.
- Applicants: MANI, Inc.
- Inventors: Yoshiyuki Tazawa
- Web page: https://patentgrep.com/patent/US11304849B2

## CPC

- A61B 17/3211: Surgical scalpels, knives; Accessories therefor
- A61F 9/0133: {Knives or scalpels specially adapted therefor}
- A61F 9/007: Methods or devices for eye surgery
- A61F 2230/0017: Angular shapes
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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

A medical knife has a flat projection shape of a cutting part formed in an approximate rhomboid shape including a front end part, a widest part with the largest width, and a side surface part formed between the front end part and the widest part. A front side bevel constituting an edge on the front side and a back side bevel constituting an edge on the back side are individually formed, having as a boundary a virtual surface including an edge formed along the periphery of the cutting part. A ratio of the angle β between the virtual surface and the back side bevel to the angle α between the virtual surface and the front side bevel at the front end part is greater than the ratio of the angle θ between the virtual surface and the back side bevel to the angle α at the side surface part.

## Claims

### Claim 1

A medical knife having an edge formed along the periphery of a cutting part, comprising:
a flat projection shape of the cutting part is formed in a five-sided polygon shape of which one side is connected to a shank, and is configured by a front end part including a pointed end formed on a front end portion of the cutting part and the vicinity of the pointed end, a widest part with the largest width, and a side surface part formed between the front end part and the widest part,
a front side bevel constituting an edge on the front side and a back side bevel constituting an edge on the back side are individually formed, having as a boundary a virtual surface including the edge formed along the periphery of the cutting part, and
the ratio of the angle between the virtual surface and the back side bevel to the angle between the virtual surface and the front side bevel at the front end part is greater than the ratio of the angle between the virtual surface and the back side bevel to the angle between the virtual surface and the front side bevel at the side surface part.

### Claim 2 (depends on 1)

The medical knife of claim 1, wherein a thickness on the front side of the virtual surface is greater than a thickness on the back side, with flail the virtual surface as a boundary.

### Claim 3 (depends on 2)

The medical knife of claim 2, wherein the ratio of the angle between the virtual surface and the back side bevel to the angle between the virtual surface and the front side bevel is nearly fixed at the side surface part.

### Claim 4 (depends on 1)

The medical knife of claim 1, wherein the ratio of the angle between the virtual surface and the back side bevel to the angle between the virtual surface and the front side bevel is nearly fixed at the side surface part.