Tangential fit of patient-specific guides

Patent metadata

Field	Value
Publication number	US-9826981-B2
Application number	US-201414202861-A
Country	US
Kind code	B2
Filing date	Mar 10, 2014
Priority date	Mar 13, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A bone preparation guide including a first patient-specific portion based on image data of a specific patient's bone and configured to match the patient's specific bone surface. A second patient-specific portion is based on image data of the specific patient's bone and configured to match the patient's specific bone surface. A patient-generic portion is configured to be a bone-facing portion supported by the first and the second patient-specific bone contacting members at a portion of the patient's bone surface not imaged during preparation of a preoperative plan.

First claim

What is claimed is:

1. A bone preparation guide comprising:
a first patient-specific portion based on image data of a specific patient's bone and configured to match the patient's specific bone surface;
a second patient-specific portion based on image data of the specific patient's bone and configured to match the patient's specific bone surface; and
a patient-generic portion configured to be a bone-facing portion supported by the first patient-specific portion and the second patient-specific portion at a portion of the patient's bone surface not imaged during preparation of a preoperative plan;
wherein the first patient-specific portion and the second patient-specific portion both include bone contacting members including pointed tips.

2. The bone preparation guide of claim 1 , wherein the patient-generic portion includes a compliant portion.

3. The bone preparation guide of claim 1 , wherein the patient-generic portion is flexible, and both the first patient-specific portion and the second patient-specific portion are rigid.

4. The bone preparation guide of claim 1 , wherein the patient-generic portion includes a plurality of movable members configured to conform to the patient's bone shape.

5. The bone preparation guide of claim 1 , wherein the bone preparation guide defines a guide aperture.

6. The bone preparation guide of claim 1 , wherein the guide includes a plurality of patient-specific guide rods configured to rest against an outer surface of the patient's specific bone.

7. The bone preparation guide of claim 1 , wherein the first patient-specific portion is customized based on first two-dimensional image data of a specific patient and to correspond to the patient's own specific bone geometry, and the second patient-specific portion is customized based on second two-dimensional image data of the specific patient to correspond to the patient's own specific bone geometry, the first two-dimensional image data is different than the second two-dimensional image data.

8. The bone preparation guide of claim 7 , wherein the first patient-specific portion and the second patient-specific portion are customized based on a three-dimensional model of the specific patient's bone, the three-dimensional model based solely on two-dimensional x-ray images of the specific patient's bone.

9. The bone preparation guide of claim 1 , wherein the first patient-specific portion and the second patient-specific portion are customized based on historical data from other patients, the historical data including age and physical dimensions.

10. The bone preparation guide of claim 1 , wherein the guide defines a cutting slot.

11. The bone preparation guide of claim 1 , wherein the guide is entirely compliant.

12. The bone preparation guide of claim 1 , wherein the bone preparation guide is one of a tibia guide, femoral guide, or acetabular guide.

13. A bone preparation guide comprising:
a plurality of first patient-specific bone contacting members customized based on two-dimensional image data of a specific patient to match the patient's specific bone geometry and provide a first bone coupling surface;
a plurality of second patient-specific bone contacting members customized based on two-dimensional image data of the specific patient to match the patient's specific bone geometry and provide a second bone coupling surface; and
a patient-generic portion configured as a bone-facing surface to be supported by the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members at a portion of the patient's bone surface not imaged during preparation of a preoperative plan;
wherein the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members both include pointed tips.

14. The bone preparation guide of claim 13 , wherein the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members are customized based directly on two-dimensional x-ray data from only two x-ray images taken along intersecting planes.

15. The bone preparation guide of claim 13 , wherein the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members are customized based on a three-dimensional bone model, which is based on two-dimensional x-ray data.

16. The bone preparation guide of claim 15 , wherein the guide includes a compliant material, and the patient-generic portion is between the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members.

17. The bone preparation guide of claim 15 , wherein the plurality of first patient-specific bone contacting members and the plurality of second patient-specific bone contacting members are rigid, and the patient-generic portion is flexible.

18. The bone preparation guide of claim 13 , further comprising a plurality of patient-specific guide rods configured to rest against an outer surface of the patient's specific bone.

19. A bone preparation guide comprising:
a first patient-specific portion based on image data of a specific patient's bone and configured to match the patient's specific bone surface;
a second patient-specific portion based on image data of the specific patient's bone and configured to match the patient's specific bone surface;
a patient-generic portion configured to be a bone-facing portion supported by the first patient-specific portion and the second patient-specific portion at a portion of the patient's bone surface not imaged during preparation of a preoperative plan; and
a plurality of patient-specific guide rods configured to rest against an outer surface of the patient's specific bone.

20. A bone preparation guide comprising:
a first patient-specific portion based on image data of a specific patient's bone and configured to match the patient's specific bone surface;
a second patient-specific portion based on image data of the specific patient's bone and configured to match the patient's specific bone surface; and
a patient-generic portion configured to be a bone-facing portion supported by the first patient-specific portion and the second patient-specific portion at a portion of the patient's bone surface not imaged during preparation of a preoperative plan;
wherein the patient-generic portion is flexible, and both the first patient-specific portion and the second patient-specific portion are rigid.

Assignees

• Biomet Mfg Llc

Inventors

• Schoenefeld Ryan J
• Hershberger Troy W
• Mauch Thomas J

Classifications

• A61B2017/568

  produced with shape and dimensions specific for an individual patient · CPC title

• A61B17/1764

  for the knee · CPC title

• A61B2034/108

  Computer aided selection or customisation of medical implants or cutting guides · CPC title

• A61B17/157

  Cutting tibia · CPC title

• A61B17/1746

  for the acetabulum · CPC title