Surgical article formed from fine grained tungsten carbide in nickel matrix

Patent metadata

Field	Value
Publication number	US-12171913-B2
Application number	US-201917312086-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 13, 2018
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A biocompatible surgical article is provided for cutting biological tissue or implantation in contact therewith. The surgical article has a composition of tungsten carbide-nickel with a percentage of additional metal carbides present. A typical composition in total weight percentages is WC 85 to 95%, Cr3C2, Mo2C, VC each alone or in combination being present from 0 to 2%, and Ni constituting the remainder. The composition is formed to have a mean grain size of between 200 and 800 nm with a particle dispersion index (PdI) corresponding to (the square of the standard deviation)/(mean grain size) of between 0 and 0.6, and in some embodiments between 0.02 and 0.2.

First claim

The invention claimed is:

1. A surgical article comprising:
a composition having a desired shape and a mean grain size, said composition consisting essentially of by weight: WC present from 85 to 95 total weight percent; Cr 3 C 2 and Mo 2 C each alone, or in combination being present from 0 to 2 total weight percent, and Ni constituting the remainder; the average grain size being between 200 and 800 nm with a particle dispersion index of between 0.02 and 0.6.

2. The surgical article of claim 1 wherein the desired shape is configured to cut, mill, burr, or otherwise remove tissue from a subject.

3. The surgical article of claim 1 wherein the desired shape is a smooth trocar, a threaded trocar, a Kirschner pin, a drill bit, a rongeur, an end-effector, a burr, a cutter, or a surgical saw blade.

4. The surgical article of claim 1 wherein the desired shape is a cutter sleeve, a bone clamp, a hip implant, a knee implant, a shoulder implant, an ankle implant, an elbow implant, a spinal implant, a screw, a pin, an intramedullary nail, or a trauma plate.

5. The surgical article of claim 1 further comprising a surface coating wherein the desired shape is a surgical drill bit, an orthopedic implant, a dental drill bit, a drill guide, a saw guide, a screw, or a pin.

6. A method of cutting tissue of a subject in the course of a surgical procedure comprising:
providing a surgical article according to claim 1 , the surgical article comprising a tissue contacting portion for engaging the tissue of the subject.

7. The method of claim 6 wherein said surgical article is rotated or oscillated.

8. The method of claim 6 further comprising selectively coupling said surgical article to a robotic arm prior to engaging the tissue.

9. A method of modifying tissue of a subject in the course of a surgical procedure comprising:
providing a surgical article according to claim 1 for placement of said surgical article in contact with the tissue of the subject, wherein said surgical article is configured to be retained in vivo and in contact with the tissue of the subject.

10. The method of claim 9 further comprising removing a portion of the tissue from the subject to expose a tissue surface and said surgical article is complementary to the tissue surface.

11. The method of claim 10 wherein said removing step is performed robotically.

12. A surgical article comprising:
a composition having a desired shape and a mean grain size, said composition consisting essentially of by weight: WC present from 85 to 95 total weight percent; Cr3C2, and Mo2C, each alone, or in combination being present from 0 to 2 total weight percent, and Ni constituting the remainder; the average grain size being between 200 and 800 nm with a particle dispersion index of between 0 and 0.6, wherein Cr 3 C 2 and Mo 2 C are both present and constitute in total more than 0 and less than 1 total weight percent.

13. The surgical article of claim 12 wherein the desired shape is configured to cut, mill, burr, or otherwise remove tissue from a subject.

14. The surgical article of claim 12 wherein the desired shape is a smooth trocar, a threaded trocar, a Kirschner pin, a drill bit, a rongeur, an end-effector, a burr, a cutter, or a surgical saw blade.

15. The surgical article of claim 12 wherein the desired shape is a cutter sleeve, a bone clamp, a knee implant, a hip implant, a shoulder implant, an ankle implant, an elbow implant, a spinal implant, a screw, a pin, a trauma plate, or an intramedullary nail.

16. The surgical article of claim 12 further comprising a surface coating wherein the desired shape is a drill bit, an orthopedic implant, a dental drill bit, a drill guide, a saw guide, a screw, a pin.

17. A method of cutting tissue of a subject in the course of a surgical procedure comprising:
providing a surgical article according to claim 3 , the surgical article comprising a tissue contacting portion for engaging the tissue of the subject.

18. The method of claim 17 wherein said surgical article is rotated or oscillated.

19. The method of claim 18 further comprising selectively coupling said surgical article to a robotic arm prior to engaging the tissue.

20. A method of modifying tissue of a subject in the course of a surgical procedure comprising:
providing a surgical article according to claim 12 for placement of said surgical article in contact with the tissue of the subject, wherein the said surgical article is configured to be retained in vivo and in contact with the tissue of the subject.

21. The method of claim 20 further comprising removing a portion of the tissue to of the subject expose a tissue surface and said surgical article is complementary to the tissue surface.

22. The method of claim 21 wherein said removing step is performed robotically.

Assignees

• Think Surgical Inc
• Extramet Products Llc

Inventors

• Pack Timothy
• Douglas Christopher
• Zuhars Joel
• Forstein Micah

Classifications

• A61L27/047 Primary

  Other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06 · CPC title

• A61B17/34

  Trocars; Puncturing needles · CPC title

• A61L27/427

  of other specific inorganic materials not covered by A61L27/422 or A61L27/425 · CPC title

• A61B17/32002

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B2017/00836

  corrosion-resistant (A61B2017/00853 takes precedence; preventing galvanic or electrolytic corrosion in prostheses A61F2210/0009) · CPC title