Assembler for modular prosthesis

Patent metadata

Field	Value
Publication number	US-10660767-B2
Application number	US-201615362675-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Jan 11, 2016
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

A system and method for improving installation of a prosthesis. Devices include prosthesis installation tools, prosthesis assembly tools, site preparation systems, and improved power tools used in implant site preparation.

First claim

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. A system for assembly of a modular prosthesis including a stem portion, a trunnion portion coupled to the stem portion, the trunnion portion having an insertion profile defining a trunnion axis, and a prosthesis head configured for an installation on the trunnion portion and the prosthesis head defining a distal head portion, a proximal head portion opposite of the distal head portion, the prosthesis head further defining a bore with the proximal head portion including a bore opening into the bore, the bore complementary to the insertion profile with the bore defining a bore axis, comprising:
a head alignment structure including a housing defining a cavity complementary to an outer portion of the prosthesis head with said housing having a head alignment axis extending through said cavity wherein said housing is configured to anti-rotatingly enclose, during the installation, the prosthesis head within said cavity and configured to align said head alignment axis with the bore axis producing and maintaining a head alignment of said head alignment axis with the bore axis:
wherein said housing engages both the distal head portion and the proximal head portion.

2. The system of claim 1 further comprising:
a trunnion engagement structure configured to be coupled to the trunnion portion and disposed on the trunnion axis; and
an alignment bracket including a first bracket engagement structure complementary to said trunnion engagement structure and including a second bracket engagement structure complementary to said head alignment structure; and
wherein said alignment bracket is configured to secure said head alignment structure relative to the trunnion portion while aligning said head alignment axis with the trunnion axis.

3. The system of claim 1 further comprising:
a tool, configured to engage said head alignment structure, said tool further configured to generate an assembly force along an assembly force axis, said assembly force axis aligned with said head alignment axis when said head alignment axis is aligned with said trunnion axis.

4. The system of claim 2 further comprising:
a tool, configured to engage said alignment bracket, said tool further configured to generate an assembly force along an assembly force axis, said assembly force axis aligned with said head alignment axis when said alignment bracket secures said head alignment structure relative to the trunnion portion and when alignment bracket aligns said head alignment axis with the trunnion axis.

5. The system of claim 3 wherein said tool includes a shaft coupling said head alignment structure and wherein said shaft includes a force sensor.

6. The system of claim 4 wherein said tool includes a shaft for coupling to said head alignment structure and wherein said shaft includes a force sensor.

7. The system of claim 3 wherein said tool includes a force engine configured to produce said assembly force.

8. The system of claim 7 wherein said force engine includes a torquer configured to generate a torque and a converter coupled to said torquer configured to produce a decreasing displacement, responsive to said torque, of the prosthesis head relative to the stem.

9. The system of claim 7 wherein said force engine includes a motor configured to generate a motion and a converter coupled to said motor configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

10. The system of claim 7 wherein said force engine includes an impulser configured to generate a set of impulses and a converter coupled to said impulser configured to produce a decreasing linear displacement, responsive to said set of impulses, of the prosthesis head relative to the stem.

11. The system of claim 4 wherein said tool includes a force engine configured to produce said assembly force.

12. The system of claim 11 wherein said force engine includes a torquer configured to generate a torque and a converter coupled to said torquer configured to produce a decreasing displacement, responsive to said torque, of the prosthesis head relative to the stem.

13. The system of claim 11 wherein said force engine includes a motor configured to generate a motion and a converter coupled to said motor configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

14. The system of claim 11 wherein said force engine includes an impulser configured to generate a set of impulses and a converter coupled to said impulser configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

15. The system of claim 5 wherein said tool includes a force engine configured to produce said assembly force.

16. The system of claim 15 wherein said force engine includes a torquer configured to generate a torque and a converter coupled to said torquer configured to produce a decreasing displacement, responsive to said torque, of the prosthesis head relative to the stem.

17. The system of claim 15 wherein said force engine includes a motor configured to generate a motion and a converter coupled to said motor configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

18. The system of claim 15 wherein said force engine includes an impulser configured to generate a set of impulses and a converter coupled to said impulser configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

19. The system of claim 6 wherein said tool includes a force engine configured to produce said assembly force in realtime during application of said assembly force to said head alignment structure.

20. The system of claim 19 wherein said force engine includes a torquer configured to generate a torque and a converter coupled to said torquer configured to produce a decreasing displacement, responsive to said torque, of the prosthesis head relative to the stem.

21. The system of claim 19 wherein said force engine includes a motor configured to generate a motion and a converter coupled to said motor configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

22. The system of claim 19 wherein said force engine includes an impulser configured to generate a set of impulses and a converter coupled to said impulser configured to produce a decreasing linear displacement, responsive to said motion, of the prosthesis head relative to the stem.

23. The system of claim 3 wherein the prosthesis head and the trunnion have a predetermined cold weld point wherein an application of a joining force in excess of said predetermined cold weld point produces a cold weld of the prosthesis head to the trunnion portion and wherein said tool generates said assembly force exceeding said predetermined cold weld point when said head alignment axis is aligned with said trunnion axis.

24. A system for assembly of a modular prosthesis including a stem portion, a trunnion portion coupled to the stem portion, the trunnion portion having an insertion profile defining a trunnion axis, and a prosthesis head configured to be installed on the trunnion portion and defining a bore complementary to said insertion profile wit

Assignees

• Behzadi Kambiz

Inventors

• Behzadi Kambiz

Classifications

• A61F2002/30525

  Worm gears · CPC title

• A61F2002/4627

  with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument · CPC title

• A61B17/1666

  for the acetabulum · CPC title

• A61B34/20

  Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis · CPC title

• A61B17/142

  with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades · CPC title