Method For Forming A Patient Specific Surgical Guide Mount

• US 20100212138A1
• Filed: 02/24/2010
• Published: 08/26/2010
• Est. Priority Date: 02/24/2009
• Status: Active Grant

• Current Assignee: MicroPort Orthopedics Holdings, Inc. (MicroPort Scientific Corp.)
• Original Assignee: Wright Medical Technology Incorporated (Stryker Corporation)
• Inventors: Carroll, Michael, Stemniski, Paul, Obert, Richard
• Granted Patent: US 9,113,914 B2
• Time in Patent Office: Days
• US Class Current: 29/446
• CPC Class Codes: A61B 17/151 for corrective osteotomy
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 2017/0023 disposable
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/568 produced with shape and dimensions specific for an individual patient
• CPC Class Codes: A61B 2034/104 Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: B29C 64/386 Data acquisition or data processing for additive manufacturing
• CPC Class Codes: B33Y 50/02 for controlling or regulating additive manufacturing processes
• CPC Class Codes: B33Y 70/00 Materials specially adapted for additive manufacturing
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49863 with prestressing of part

Abstract

A resection guide locator includes a bone engagement portion with surfaces that are complementary to the surface topographies of a bone to be resected during surgery. A housing includes a socket defined by a resilient annular wall that is sized and arranged so to accept a resection guide by press-fit to thereby position and hold the resection guide within the socket. The resection guide is maintained in a predetermined, preferred position while the surfaces are releasably locked in position on the bone. A method is disclosed for forming and using the resection guide locator.

Claims

1. A method for forming a resection guide locator comprising the steps of:

(A) generating an anatomically accurate image of a bone that includes surface topographies;

(B) identifying a femoral head, a distal femur, a distal tibia and a proximal tibia;

(C) obtaining five millimeter thick slices of said at three millimeter spacing;

(D) obtaining a 2D T1 FSE (T1 weighted fast spin echo) imaging sequence;

(E) converting said anatomically accurate image to a digital model;

(F) adding a digital representation of a resection guide locator to said digital model so as to form a composite digital model;

(G) mapping one of said surface topographies complementarily onto a bone engagement portion of said resection guide locator; and

(H) manufacturing said resection guide locator based upon said composite digital model so that a manufactured resection guide locator is formed including said complementary surface topography on a bone engagement portion and a receptacle pocket sized to receive a resection guide with a press-fit.

2. The method of claim 1 further comprising inserting a resection guide in said receptacle pocket of said reception guide locator.

3. The method of claim 1 further comprising pinning said resection guide to the bone such that said resection guide locator is sandwiched between said resection guide and the bone.

4. The method of claim 1 further comprising between steps (C) and (D) the steps of:

setting a coil to at least one of a rapid body coil, a multiple array extremity coil, and a rapid body coil.

5. The method of claim 1 further comprising at step (D) the step of:

applying a pulse sequence of at least one of a 2D T1 FSE, a FATSEP 3D RSSG, and a 2D T1 FSE.

6. The method of claim 5 further comprising a TR time of at least one of 2700 milliseconds, 61 milliseconds, and 2700 milliseconds;

and a TE time of at least one of 10 milliseconds, 28.5 milliseconds, and 10 milliseconds.

7. The method of claim 5 further comprising a flip angle of 90°

.

8. The method of claim 5 further comprising a matrix of at least one of 256 by 256 and 512 by 512.

9. The method of claim 5 further comprising an acquisition time of at least one of 5:

46, 15;

37, and 5;

46.

10. A method for forming resection guide locator and positioning a resection guide for resection of a bone comprising the steps of:

(A) generating an anatomically accurate image of a bone that includes surface topographies;

(B) identifying at least one of a femoral head, a distal femur, a distal tibia and a proximal tibia;

(C) obtaining five millimeter thick slices of said, at three millimeter spacing;

(D) obtaining a 2D T1 FSE (T1 weighted fast spin echo) imaging sequence;

(E) converting said anatomically accurate image to a digital model;

(F) adding a digital representation of a resection guide locator to said digital model so as to form a composite digital model;

(G) mapping one of said surface topographies complementarily onto a bone engagement portion of said resection guide locator;

(H) manufacturing said resection guide locator based upon said composite digital model so that a manufactured resection guide locator is formed including said complementary surface topography on a bone engagement portion and a receptacle pocket sized to receive a resection guide with a press-fit; and

(I) applying said resection guide locator to said bone such that said complementary surface topography locks said bone engagement portion to a corresponding portion of said bone.

11. The method of claim 10 further comprising inserting a resection guide in said receptacle pocket of said reception guide locator.

12. The method of claim 10 further comprising pinning said resection guide to the bone such that said resection guide locator is sandwiched between said resection guide and the bone.

13. The method of claim 10 further comprising between steps (C) and (D) the steps of:

setting a coil to at least one of a rapid body coil, a multiple array extremity coil, and a rapid body coil.

14. The method of claim 10 further comprising at step (D) the step of:

applying a pulse sequence of at least one of a 2D T1 FSE, a FATSEP 3D RSSG, and a 2D T1 FSE.

15. The method of claim 14 further comprising a TR time of at least one of 2700 milliseconds, 61 milliseconds, and 2700 milliseconds;

and a TE time of at least one of 10 milliseconds, 28.5 milliseconds, and 10 milliseconds.

16. The method of claim 14 further comprising a flip angle of 90°

.

17. The method of claim 14 further comprising a matrix of at least one of 256 by 256 and 512 by 512.

18. The method of claim 14 further comprising an acquisition time of at least one of 5:

46, 15;

37, and 5;

46.

19. The method of claim 10 further comprising inserting a resection guide in said receptacle pocket of said reception guide locator.

20. The method of claim 10 further comprising pinning said resection guide to the bone such that said resection guide locator is sandwiched between said resection guide and the bone.

21. The method of claim 10 further comprising scan boundaries including the proximal femoral head through distal femur and the most proximal tibial point through most distal tibial point of a patient'"'"'s leg.

22. The method of claim 10 further comprising scanning a femur or a tibia in two separate regions, wherein between said two scans the patient will move in order to reposition a coil to cover the most proximal or distal regions of interest.

23. The method of claim 10 further comprising scanning a femur or a tibia to provide substantial overlap between the two scans.

24. The method of claim 10 further comprising between steps (C) and (D) the steps of:

placing a patient'"'"'s leg in the middle of the coil to ensure the largest field of view possible without distortion.