Surgical article formed from fine grained tungsten carbide in nickel matrix

Patent metadata

Field	Value
Publication number	US-2025073377-A1
Application number	US-202418950353-A
Country	US
Kind code	A1
Filing date	Nov 18, 2024
Priority date	Dec 13, 2018
Publication date	Mar 6, 2025
Grant date	—

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 an 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

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 1200 nm with a particle dispersion index of between 0.02 and 1.2.

2 . The surgical article of claim 1 wherein the particle dispersion index is between 0.02 and 0.6.

3 . The surgical article of claim 1 wherein Cr 3 C 2 and Mo 2 C are all present and constitute in total more than 0 and less than 1 total weight percent.

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

5 . 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.

6 . 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, a probe, a pointer, or a trauma plate.

7 . 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.

8 . The surgical article of claim 1 wherein the composition further comprises VC present from 0 to 1 percent by total weight.

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

10 . The method of claim 9 wherein said surgical article is rotated or oscillated.

11 . The method of claim 9 further comprising selectively coupling said surgical article to a robotic arm prior to engaging the tissue.

12 . 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 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.

13 . The method of claim 12 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.

14 . The method of claim 13 wherein said removing step is performed robotically.

Assignees

• Think Surgical Inc
• Extramet Products Llc

Inventors

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

Classifications

• A61L2400/12

  Nanosized materials, e.g. nanofibres, nanoparticles, nanowires, nanotubes; Nanostructured surfaces · CPC title

• A61L2430/24

  for joint reconstruction · CPC title

• A61L31/026 Primary

  Ceramic or ceramic-like structures, e.g. glasses · CPC title

• A61L31/022 Primary

  Metals or alloys · CPC title