Patient-specific computed tomography guides

• US 9,066,727 B2
• Filed: 03/03/2011
• Issued: 06/30/2015
• Est. Priority Date: 03/04/2010
• Status: Active Grant

• Current Assignee: Materialise NV
• Original Assignee: Materialise NV
• Inventors: Catanzarite, Joshua B., Schoenefeld, Ryan J.
• Primary Examiner(s): Manahan, Todd
• Assistant Examiner(s): SHIRSAT, MARCELA
• Application Number:
  US13/039,498
• Publication Number:
  US 20110218545A1
• Time in Patent Office: 1,580 Days
• Field of Search: 606/86.R, 606 87- 90, 606 96- 98, 606/102, 606/104
• US Class Current: 1/1
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 17/56 Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
• 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: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations

Abstract

An orthopedic device for joint arthroplasty includes a patient-specific alignment guide constructed and configured for a specific patient from medical scans that show a bone surface of a bone of the patient without any overlying soft tissue. The patient-specific alignment guide includes a patient-specific inner surface configured to be offset from and mimic the bone surface and form a clearance for soft tissue overlying the bone surface. The alignment guide also includes a plurality of patient-specific contact areas configured to mate and register directly on the bone surface without intervening soft tissue for direct bone registration. The plurality of patient-specific contact areas includes non-contiguous surface contact areas.

Claims

1. A patient-specific alignment guide for joint arthroplasty comprising:

a patient-specific inner surface configured to be offset from and mimic a bone surface so that a majority of the patient-specific inner surface does not make contact with the bone surface, the patient-specific inner surface forming a clearance under the patient-specific inner surface for soft tissue overlying the bone surface; and

a plurality of patient-specific contact areas formed on the patient-specific inner surface and configured to contact the bone surface without intervening soft tissue; and

an extension extending from the patient-specific inner surface, the extension comprising a patient-specific contact surface configured to contact the bone surface without intervening soft tissue.

2. The patient-specific alignment guide of claim 1, further comprising:

a plurality of patient-specific guiding formations having corresponding bores for guiding alignment pins or other tools therethrough.

3. The patient-specific alignment guide of claim 2, further comprising:

a reinforcing element between a first patient-specific guiding formation and a second patient-specific guide formation of the plurality of patient-specific guiding formations.

4. The patient-specific alignment guide of claim 2, wherein the patient-specific alignment guide further comprises:

an anterior flange extending distally from a first patient-specific guiding formation and a second patient-specific guiding formation of the plurality of guiding formations, and wherein the anterior flange comprises a patient-specific surface contact area for direct bone registration.

5. The patient-specific alignment guide of claim 4, wherein the anterior flange includes a removable portion.

6. The patient-specific alignment guide of claim 5, wherein the removable portion is frangible along a score line.

7. The patient-specific alignment guide of claim 4, wherein the plurality of patient-specific contact areas include at least one contact area configured to contact a tibial spine.

8. The patient-specific alignment guide of claim 4, wherein the patient-specific alignment guide includes a cutout under one of the plurality of patient-specific guiding formations configured to provide clearance for a patella tendon.

9. A patient-specific alignment guide for joint arthroplasty comprising:

a patient-specific inner surface configured to be offset from a bone surface so that a majority of the patient-specific inner surface does not make contact with the bone surface, the patient-specific inner surface forming a clearance under the patient-specific inner surface for soft tissue overlying the bone surface;

a plurality of patient-specific contact areas formed on the patient-specific inner surface and configured to contact the bone surface without intervening soft tissue;

an extension extending from the patient-specific inner surface, the extension comprising a patient-specific contact surface configured to contact the bone surface without intervening soft tissue;

a first pair of patient-specific guiding formations having corresponding bores for guiding a tool therethrough; and

a second pair of patient-specific guiding formations having corresponding bores for guiding the tool therethrough.

10. The patient-specific alignment guide of claim 9, wherein the first pair of guiding formations are proximal guiding formations and the second pair of guiding formations are anterior guiding formations.

11. The patient-specific alignment guide of claim 10, wherein the plurality of patient-specific contact areas includes:

a first surface contact area configured to contact a tibial spine portion on a proximal surface of a tibia; and

a second surface contact area configured to contact an anterior bone surface of the tibia.

12. The patient-specific alignment guide of claim 10, wherein the patient-specific alignment guide includes a cutout under at least one of the guiding formations, and wherein at least one of the guiding formations is configured to provide clearance for a patella tendon.