Nuclear hydrolysis cannula

• US 5,284,476 A
• Filed: 03/20/1992
• Issued: 02/08/1994
• Est. Priority Date: 03/20/1992
• Status: Expired due to Fees

• Current Assignee: Koch, Paul S.
• Original Assignee: Koch, Paul S.
• Inventors: Koch, Paul S.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): ELGART, VANITHA M
• Application Number:
  US07/854,701
• Time in Patent Office: 690 Days
• Field of Search: 604/272-274, 604/22, 604/239, 604/264, 604/51, 604/283, 606/166
• US Class Current: 604/274
• 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

Abstract

A cannula for use in cataract surgery during the phases of hydrodissection and hydrodelamination/hydrodelineation/hydrodemarcation is described. The cannula has a hub for mating with a syringe and a needle originating from the distal end of the hub. The needle comprises a first section, second section, and truncated surface. The first section originates from the distal end of the hub and extends forward in a plane delineating the central longitudinal axis of the cannula. The second section originates from the distal end of the first section and is flattened and curved away from the central longitudinal axis of the hub. The truncated surface of the needle forms a rounded tip with beveled surfaces. The intersection of the bevel and sides of the cannula are sharpened to provide a cutting edge.

Claims

1. A nuclear hydrolysis cannula for use in removing cataracts during the phases of hydrodissection and hydrodelamination/hydrodelineation/hydrodemarcation, comprising:

a hub portion having a proximal end, a distal end, and a centrally disposed longitudinal axis;

a one-piece needle having a straight first section a curved second section, a first end at said first section, and a second end at said second section, said first end being mounted in said distal end of said hub portion with said needle extending forwardly beyond said distal end, said first section being coaxial with said longitudinal axis of said hub, said second section extending away from said longitudinal axis and terminating at said second end without curving inwardly towards said longitudinal axis, and said second end being trucated to define a beveled surface and having a sharpened edge with a rounded tip.

2. The nuclear hydrolysis cannula of claim 1, wherein said second section has a flattened surface extending along its length.

3. The nuclear hydrolysis cannula of claim 1 wherein said hub at said proximal end is configured to mate with a standard syringe.

4. The nuclear hydrolysis cannula of claim 3, wherein said hub at said proximal end includes a female luer-look fitting.

5. The nuclear hydrolysis cannula of claim 1, wherein said first section extends outwardly from said distal end of said hub portion approximately 8.00 mm, and said needle from said distal end of said hub portion to said second end has an axial length of approximately 20.00 mm.

6. The nuclear hydrolysis cannula of claim 1, wherein said second section has a radius of curvature of approximately 19.00 mm.

7. The nuclear hydrolysis cannula of claim 6, wherein said second end is disposed a distance of approximately 5.00 mm from said longitudinal axis.

8. The nuclear hydrolysis cannula of claim 1, wherein said second section of said needle has a curvature which defines with said first section a concave aspect which is directed away from said longitudinal axis.

9. The nuclear hydrolysis cannula of claim 1, wherein said beveled surface is directed away from said longitudinal axis.

10. The nuclear hydrolysis cannula of claim 9, wherein said second section has a flattened surface extending along its length.

11. A nuclear hydrolysis cannula for use in removing cataracts during the phases of hydrodissection and hydrodelamination/hydrodelineation/hydrodemarcation, comprising:

a hub portion having a proximal end, a distal end, and a centrally disposed longitudinal axis;

a one-piece needle having a straight first section a curved second section, a first end at said first section, and a second end at said second section, said first end being mounted in said distal end of said hub portion with said needle extending forwardly beyond said distal end, said first section being coaxial with said longitudinal axis of said hub, said second section extending away from said longitudinal axis and terminating at said second end without curving inwardly towards said longitudinal axis, said second end being trucated to define a beveled surface and having a sharpened edge with a rounded tip, said first section extending outwardly from said distal end of said hub portion approximately 8.00 mm, said needle from said distal end of said hub portion to said second end having an axial length of approximately 20.00 mm, said second section having a radius of curvature of approximately 19.00 mm, and said second end being disposed a distance of approximately 5.00 mm from said longitudinal axis.

12. The nuclear hydrolysis cannula of claim 11, wherein said second section has flattened surface extending along its length.

13. The nuclear hydrolysis cannula of claim 11, wherein said hub at said proximal end is configured to mate with a standard syringe.

14. The nuclear hydrolysis cannula of claim 13, wherein said hub at said proximal end includes a female luer-lock fitting.

15. The nuclear hydrolysis cannula of claim 11, wherein said second section of said needle has a curvature which defines with said first section a concave aspect which is directed away from said longitudinal axis.

16. The nuclear hydrolysis cannula of claim 11, wherein said beveled surface is directed away from said longitudinal axis.

17. The nuclear hydrolysis cannula of claim 16, wherein said second section has a flattened surface extending along its length.

18. A nuclear hydrolysis cannula for use in removing cataracts during the phases of hydrodissection and hydrodelamination/hydrodelineation/hydrodemarcation, comprising:

a hub portion having a proximal end, a distal end, and a centrally disposed longitudinal axis;

a one-piece needle having a straight first section a curved second section, a first end at said first section, and a second end at said second section, said first end being mounted in said distal end of said hub portion with said needle extending forwardly beyond said distal end, said first section being coaxial with said longitudinal axis of said hub, said second section having a curvature which defines with said first section a concave aspect which is directed away from said longitudinal axis, and said second end being truncated to define a beveled surface and having a sharpened edge with a rounded tip.

19. The nuclear hydrolysis cannula of claim 18, wherein said second section has a flattened surface extending along its length.

20. The nuclear hydrolysis cannula of claim 18 wherein said hub at said proximal end is configured to mate with a standard syringe.

21. The nuclear hydrolysis cannula of claim 20, wherein said hub at said proximal end includes a female luer-lock fitting.

22. The nuclear hydrolysis cannula of claim 18, wherein said first section extends outwardly from said distal end of said hub portion approximately 8.00 mm, and said needle from said distal end of said hub portion to said second end has an axial length of approximately 20.00 mm.

23. The nuclear hydrolysis cannula of claim 18, wherein said second section has a radius of curvature of approximately 19.00 mm.

24. The nuclear hydrolysis cannula of claim 23, wherein said second end is disposed a distance of approximately 5.00 mm from said longitudinal axis.

25. The nuclear hydrolysis cannula of claim 18, wherein said beveled surface is directed away from said longitudinal axis.

26. The nuclear hydrolysis cannula of claim 25, wherein said second section has a flattened surface extending along its length.