COMPUTER ASSISTED SUBCHONDRAL INJECTION

• US 20140364807A1
• Filed: 06/11/2014
• Published: 12/11/2014
• Est. Priority Date: 06/11/2013
• Status: Active Grant

• Current Assignee: ORTHOsoft ULC. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Orthosoft Inc. (Zimmer Biomet Holdings, Inc.)
• Inventors: COUTURE, Pierre, AMIOT, Louis-Philippe, MERCIER, Laurence
• Granted Patent: US 10,124,124 B2
• Time in Patent Office: Days
• US Class Current: 604/116
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 17/3472 for bones, e.g. intraosseus injections
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 2034/2068 using pointers, e.g. pointers having reference marks for determining coordinates of body points
• CPC Class Codes: A61M 5/427 Locating point where body is to be pierced, e.g. vein location means using ultrasonic waves, injection site templates
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

A method for assisting subchondral injection comprising creating a model of bone and soft tissue of a patient. At least one void is modeled in the bone from the model of bone and soft tissue. An injection site is identified from the model of bone and soft tissue and modeling of the at least one void. Data is output for guiding at least in the locating of the injection site and drilling of the bone to reach the void. A patient-specific jig for subchondral injection may be created based on the injection site location.

Claims

1. A method for assisting subchondral injection comprising:

creating a model of bone and soft tissue of a patient;

modeling at least one void for the bone from the model of bone and soft tissue;

identifying an injection site from the model of bone and soft tissue and modeling of the at least one void; and

outputting data for guiding at least in the locating of the injection site and drilling of the bone to reach the void.

2. The method according to claim 1, further comprising calculating void filling parameters from the modeling of the at least one void.

3. The method according to claim 2, wherein calculating void filling parameters comprises calculating a volume of filler material to be injected.

4. The method according to claim 1, wherein outputting data comprises outputting a model of a patient specific jig, the patient specific jig having at least one component positioned relative to the injection site to guide instrument manipulation at the injection site.

5. The method according to claim 4, wherein identifying an injection site from the model of bone and soft tissue comprises identifying a percutaneous abutment location, and wherein outputting the model of the patient specific jig comprises outputting the model of the jig with abutments for percutaneous abutment against the leg at the percutaneous abutment location.

6. The method according to claim 4, wherein outputting the model of the patient specific jig comprises outputting the model with the component being a drill guide for drilling a hole in the bone at the injection site.

7. The method according to claim 4, wherein outputting the model of the patient specific jig comprises outputting the model with the component being an injection guide for positioning an injection device relative to the injection site.

8. A patient-specific jig for subchondral injection, comprising:

a structure;

abutments on the structure, a position of the abutments in the structure based on a patient-specific bone and soft tissue model, the abutments each having a contour-matching surface fabricated as a function of planned abutment locations of the patient-specific bone and soft tissue model; and

at least one guiding component in the structure, a position of the at least one guiding component in the structure based on a planned injection site on the patient-specific bone and soft tissue model, the at least one guiding component adapted to guide a tool for effecting subchondral injection surgery.

9. The patient-specific jig according to claim 8, further comprising a patient-specific file comprising a 3-D model of a bone and soft tissue of the patient.

10. The patient-specific jig according to claim 8, wherein the at least one guiding component is a tube adapted to receive therein at least one of the drill bits and an injection device.

11. The patient-specific jig according to claim 10, wherein the tube has a height selected as a function of a depth of the drilling tool.

12. The patient-specific jig according to claim 8, wherein the abutments are percutaneous abutments, the abutments having the contour-matching surface fabricated taking into consideration soft tissue on the bone.

13. The patient-specific jig according to claim 8, wherein the abutments abut against soft tissue covering at least two bones.

14. The patient-specific jig according to claim 8, further comprising a second structure connected to a distal location of the planned injection site, an interface between the structure and the second structure.

15. The patient-specific jig according to claim 14, wherein the interface comprises a telescopic joint.