PATIENT-SPECIFIC BONE GRAFTING SYSTEM AND METHOD

• US 20160345987A1
• Filed: 05/27/2016
• Published: 12/01/2016
• Est. Priority Date: 05/28/2015
• Status: Active Grant

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: GUILLOUX, SEBASTIEN, BOISVERT, OLIVIER, DUPUIS, KARINE, NEUROHR, ANSELM, ABIVEN, JEAN-GUILLAUME
• Granted Patent: US 10,271,858 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 17/1635 for grafts, harvesting or transplants
• CPC Class Codes: A61B 17/1637 Hollow drills or saws producing a curved cut, e.g. cylindrical A61B10/025, A61B17/1695 take precedence
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61B 17/1778 for the shoulder
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61B 2017/568 produced with shape and dimensions specific for an individual patient
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61F 2/4601 for introducing bone substitute, for implanting bone graft implants or for compacting them in the bone cavity
• CPC Class Codes: A61F 2/4612 of shoulders
• CPC Class Codes: A61F 2/4644 Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material bone material A61F2/28; disintegrating or milling devices B02C

Abstract

A system for generating a model of a patient specific cut guide instrument for harvesting a graft comprises a model of a graft defined by an implant interface surface, a bone interface surface, and a spatial geometry therebetween, the model being specific to a patient. A patient-specific instrument generator outputs the model of the patient specific cut guide instrument, the patient-specific instrument generator including a position determination module for orienting and positioning at least a first guide axis, and for positioning an abutment on a model of a donor bone as a function of the spatial geometry, and an instrument body generator module for generating a model of the patient specific cut guide instrument comprising a body supporting a cut guide to perform a depth cut in the donor bone positioned and oriented as a function of a contact of the body with the abutment on the donor bone, and of the model of the graft, a first guide channel for alignment with the first guide axis, and at least one anchor guide for securing the patient specific instrument cut guide on the donor bone as abutted with the abutment and aligned with the first guide axis, whereby the patient specific cut guide instrument is used for harvesting the graft for subsequent implanting without alterations to the spatial geometry of the graft.

Claims

1. A method for harvesting a graft having at least an implant interface surface, a bone interface surface, and a planned spatial geometry therebetween, the method comprising:

obtaining a cut guide instrument specific to a patient'"'"'s anatomy;

resurfacing an exposed surface of a donor bone to form one of an implant interface surface and a bone interface surface of the graft;

securing the cut guide instrument to the bone relative to resurfaced exposed surface;

performing a depth cut in the donor bone to form the other of the implant interface surface and the bone interface surface of the graft with the planned spatial geometry; and

harvesting the graft from the donor bone.

2. The method according to claim 1, wherein resurfacing the exposed surface of the donor bone comprises resurfacing the exposed surface to form a planar surface used as the implant interface surface.

3. The method according to claim 2, wherein performing the depth cut comprises forming the bone interface surface into another planar surface, the exposed surface being non parallel to the bone interface surface.

4. The method according to claim 3, wherein harvesting the graft comprises forming a cylindrical body between the implant interface surface and the bone interface surface, an axis of the cylindrical body being normal to the implant interface surface.

5. The method according to claim 2, wherein harvesting the bone comprises securing an implant against the implant interface surface and removing the implant and graft from the donor bone.

6. The method according to claim 1, wherein harvesting the graft comprises harvesting the graft to obtain the spatial geometry based on one of the Walch glenoid indication and Favard glenoid indication in a reverse shoulder arthroplasty.

7. The method according to claim 1, wherein harvesting the graft comprises harvesting the graft from a humerus being the donor bone, and further comprising implanting the graft and an implant onto the glenoid in reverse shoulder arthroplasty.

8. The method according to claim 1, further comprising implanting the graft onto a recipient bone without further alterations to the graft after said harvesting from the donor bone.

9. The method according to claim 1, wherein resurfacing the exposed surface comprises installing a guide rod and moving a resurfacing tool on the guide rod.

10. The method according to claim 9, wherein securing the cut guide instrument on the bone comprises sliding the cut guide instrument along the guide rod and into abutment with the exposed surface.

11. The method according to claim 9, further comprising forming a peg bore in the graft, the peg bore being coaxial with a hole in the donor bone made by insertion of the guide rod.

12. The method according to claim 11, wherein forming the peg bore is removing the guide rod.

13. The method according to claim 1, wherein resurfacing the exposed surface of the donor bone comprises resurfacing the exposed surface to form a spherical surface portion used as the bone interface surface.

14. The method according to claim 13, wherein performing the depth cut comprises forming the implant interface surface into a planar surface.

15. The method according to claim 14, wherein harvesting the graft comprises forming a cylindrical body between the implant interface surface and the bone interface surface, an axis of the cylindrical body being normal to the implant interface surface.

16. The method according to claim 13, wherein resurfacing the exposed surface comprises installing a first guide rod on the donor bone, and moving a resurfacing tool on the first guide rod to form said spherical surface portion.

17. The method according to claim 16, wherein securing the cut guide instrument on the bone comprises sliding the cut guide instrument along the first guide rod and into abutment with the resurfaced exposed surface.

18. The method according to claim 15, wherein harvesting the graft comprises installing a second guide rod with a second guide channel of the cut guide instrument on the donor bone and sliding an instrument on the second guide rod.

19. The method according to claim 18, wherein harvesting the graft comprises forming a peg bore in the graft, the peg bore being coaxial with a hole in the donor bone made by insertion of the second guide rod.

20. The method according to claim 19, wherein forming the peg bore is removing the second guide rod.

21. The method according to claim 19, further comprising using a patient specific alignment instrument having a receptacle receiving and conforming to the bone interface surface and a hole in the receptacle receiving and aligned with the peg bore to install the implant onto the graft.

22. The method according to claim 21, wherein using the patient specific alignment instrument further comprises sliding the patient specific alignment instrument along a guide pin to position and impact the implant and graft on the recipient bone.

23. The method according to claim 1, wherein harvesting the graft comprises harvesting a cadaver allograft.

24-40. -40. (canceled)