# US 5,700,274 A · Refractive surgery knife

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

- Number: US 5,700,274 A
- Document ID: US5700274A
- Status: Granted
- Kind: A
- Application number: 08/543,213
- Filed: 1995-10-13
- Granted: 1997-12-23
- Earliest claimed: 1993-09-28
- Inventors: Fred T. Feaster
- Web page: https://patentgrep.com/patent/US5700274A

## CPC

- A61F 9/0133: {Knives or scalpels specially adapted 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

The refractive surgery keratotomy knife has a handle with a footplate and a holding member for receiving and holding a flared surgical blade fixed to the handle and knife body. The footplate is adapted to be placed against the cornea of the eye. The blade is held by a blade support with the cutting edge of the blade extending beyond the footplate for forming an incision in the cornea of the eye by pressing the blade directly into the cornea tissue.

## Claims

### Claim 1

A refractive surgery keratotomy knife, comprising:
a support body having a footplate with first and second opposite facing sides,
said footplate having a bottom surface on said second side to be place against the cornea of the eye,
a thin planar blade having a main cutting edge which is substantially straight and which has a given length,
said blade has an attachment portion and two opposite side edges extending from said attachment portion,
each of said side edges has a substantially straight side cutting edge which forms an acute angle relative to the length of said main cutting edge,
said opposite side edges extend away from each other from said attachment portion to said main cutting edge,
a blade holding member coupled to said attachment portion of said blade for supporting said blade in a position to extend from said first side beyond said second side of said footplate with said main cutting edge being located on said second side spaced from said bottom surface of said footplate for surgery incision purposes.

### Claim 2 (depends on 1)

The refractive surgery keratotomy knife of claim 1, wherein:
said bottom surface of said footplate is substantially flat,
said main cutting edge of said blade is substantially parallel to said bottom surface of said footplate.

### Claim 3 (depends on 1)

The refractive surgery keratotomy knife of claim 1, wherein:
said bottom surface of said footplate is substantially flat,
said main cutting edge of said blade forms an acute angle relative to said bottom surface of said footplate.

### Claim 4 (depends on 1)

The refractive surgery keratotomy knife of claim 1, wherein:
said blade has a center line between said two opposite side edges with each of said two opposite side edges extending away from said center line at an angle less than 37.degree..

### Claim 5 (depends on 1)

The refractive surgery keratotomy knife of claim 1, wherein:
said blade has a center line between said two opposite side edges with each of said two opposite side edges extending away from said center line at an angle of about 10.degree..

### Claim 6 (depends on 2)

The refractive surgery keratotomy knife of claim 2, wherein:
said blade has a center line between said two opposite side edges with each of said two opposite side edges extending away from said center line at an angle less than 37.degree..

### Claim 7 (depends on 3)

The refractive surgery keratotomy knife of claim 3, wherein:
said blade has a center line between said two opposite side edges with each of said two opposite side edges extending away from said center line at an angle less than 37.degree..

### Claim 8 (depends on 1)

The refractive surgery keratotomy knife of claim 1, wherein:
said footplate comprises two spaced apart footplate portions coupled to two spaced apart support portions respectively with said blade holding member extending between said two spaced apart support portions and said blade supported to extend between said two spaced apart footplate portions.

### Claim 9 (depends on 4)

The refractive surgery keratotomy knife of claim 4, wherein:
said footplate comprises two spaced apart footplate portions coupled to two spaced apart support portions respectively with said blade holding member extending between said two spaced apart support portions and said blade supported to extend between said two spaced apart footplate portions.