EYE SURGICAL CUTTING TOOL

• US 20160022489A1
• Filed: 03/13/2014
• Published: 01/28/2016
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: D.O.R.C. Dutch Ophthalmic Research Center (International) B.V.
• Original Assignee: D.O.R.C. Dutch Ophthalmic Research Center (International) B.V.
• Inventors: HARTSTRA, Andre
• Granted Patent: US 10,231,868 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2017/320028 with reciprocating movements
• CPC Class Codes: A61B 2217/005 with suction drainage system
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 9/00736 Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments A61F9/008 takes precedence
• CPC Class Codes: A61F 9/00763 with rotating or reciprocating cutting elements, e.g. concentric cutting needles atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016

Abstract

An eye surgical cutting tool includes a tubular outer part and an axially movable tubular inner part arranged in the outer part. The outer part has a closed distal end, and the inner part has an open distal end. Both parts have an opening in the tube. Both openings are bounded on the distal side by a distal cutting edge in the respective tube. The axial position of the distal cutting edge of the inner part as a function of the circumferential direction initially proceeds towards the proximal end, and then back to the distal end again. The tool is provided with suction means to have, during use of the cutting tool, ocular tissue extended through the opening of the outer part into the interior of the outer part and to convey severed tissue via the interior of the inner part to a proximal end of the inner part.

Claims

1. An eye surgical cutting tool, comprising:

a tubular outer part with a closed distal end and an opening in the tube of the outer part, near the closed end, the opening being bounded by an edge profile formed in the tube which has a distal cutting edge and an opposite proximal cutting edge,

a tubular inner part which has an open distal end and is arranged in the tubular outer part so as to be movable in an axial direction, and

a suction that is configured to, during use of the cutting tool, extend ocular tissue through the opening of the outer part into the interior of the outer part and convey severed tissue via the interior of the inner part to a proximal end of the inner part,

wherein the tube of the inner part also has an opening, near the open end and bounded by an edge profile formed in the tube with a distal cutting edge and an opposite proximal edge, such that the opening of the outer part and the opening of the inner part are mutually aligned in a circumferential direction around the outer part and in an aligned axial position of the inner part with respect to the outer part, and

wherein the axial position of the distal cutting edge of the inner part as a function of the circumferential direction of the inner part initially proceeds towards the proximal end and then proceeds back to the distal end.

2. The eye surgical cutting tool according to claim 1, wherein the distal cutting edge of the inner part is provided with a segment which, viewed in longitudinal section of the cutting tool, makes an angle with respect to the body axis of the inner part.

3. The eye surgical cutting tool according to claim 2, wherein the angle between the inner part segment and the body axis of the inner part is between about 20°

and about 70°

.

4. The eye surgical cutting tool according to claim 1, wherein on the distal cutting edge of the inner part a cutting face is formed which leans over towards the proximal end of the inner part.

5. The eye surgical cutting tool according to claim 1, wherein the axial distance between the distal cutting edge of the inner part on the one hand and the proximal end of the inner part on the other hand reaches a minimum approximately halfway in the range of the cutting edge, viewed in circumferential direction.

6. The eye surgical cutting tool according to claim 1, wherein the distal cutting edge of the inner part has a tooth profile which is directed towards the proximal end.

7. The eye surgical cutting tool according to claim 1, wherein the inner part has a kink or bend.

8. The eye surgical cutting tool according to claim 1, wherein the open distal end of the inner part forms a distal cutting edge with a cutting face which leans away from the proximal end of the inner part.

9. The eye surgical cutting tool according to claim 1, wherein the cutting edges of the inner part form cutting faces with opposite angles of tilt.

10. The eye surgical cutting tool according to claim 9, wherein the cutting faces face away from each other.

11. The eye surgical cutting tool according claim 9, wherein the angles of tilt are of approximately equal magnitude.