CUSTOMIZED PATIENT-SPECIFIC ACETABULAR ORTHOPAEDIC SURGICAL INSTRUMENT AND METHOD OF USE AND FABRICATION

• US 20100082035A1
• Filed: 08/18/2009
• Published: 04/01/2010
• Est. Priority Date: 09/30/2008
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Keefer, Ryan
• Granted Patent: US 8,992,538 B2
• Time in Patent Office: Days
• US Class Current: 606/91
• CPC Class Codes: A61B 17/1666 for the acetabulum
• CPC Class Codes: A61B 17/1746 for the acetabulum
• 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

Abstract

A number of customized patient-specific acetabular orthopaedic surgical instruments are disclosed. A method for fabricating and using such orthopaedic surgical instruments are also disclosed.

Claims

1. A customized patient-specific orthopaedic instrument for facilitating implantation of an acetabular cup prosthesis in a coxal bone of a patient, the customized patient-specific orthopaedic instrument comprising:

a customized patient-specific acetabular reaming guide comprising (i) a body having a longitudinal passageway defined therethrough, (ii) a plurality of arms extending from the body, and (iii) a plurality of feet configured to contact a coxal bone of a patient, each foot of the plurality of feet being coupled to a corresponding arm of the plurality of arms,

wherein each foot of the plurality of feet is positioned relative to the body based on (i) a predetermined degree of version and inclination angles of the acetabular cup prosthesis when implanted in the patient'"'"'s coxal bone and (ii) the contour of the coxal bone of the patient.

2. The customized patient-specific orthopaedic instrument of claim 1, wherein each foot of the plurality of feet includes a bottom, bone-facing surface having a customized patient-specific negative contour configured to receive a portion of the patient'"'"'s coxal bone having a corresponding positive contour.

3. The customized patient-specific orthopaedic instrument of claim 1, wherein the longitudinal passageway of the body is sized to receive a bone guide pin.

4. The customized patient-specific orthopaedic instrument of claim 1, wherein the longitudinal passageway of the body is sized to receive a body of an acetabular reamer surgical tool.

5. The customized patient-specific orthopaedic instrument of claim 1, wherein:

the body includes a bottom, bone-facing surface and each foot of the plurality of feet includes a top surface,

the bottom, bone-facing surface of the body being non-coplanar with respect to a plane defined by the top surface of least one of the plurality of feet.

6. The customized patient-specific orthopaedic instrument of claim 1, wherein:

the body includes a bottom, bone-facing surface and each foot of the plurality of feet includes a top surface,

the bottom, bone-facing surface of the body and each top surface of the plurality of feet being coplanar with respect to each other.

7. The customized patient-specific orthopaedic instrument of claim 1, wherein:

the body includes a bottom, bone-facing surface and the plurality of feet includes a first foot having a first top surface defining a first plane and a second foot having a second top surface defining a second plane,

the bottom, bone-facing surface of the body, the first top surface, and the second top surface are parallel and non-coplanar with respect to each other.

8. The customized patient-specific orthopaedic instrument of claim 1, wherein:

the body includes a bottom, bone-facing surface and each foot of the plurality of feet includes a bottom surface,

the bottom, bone-facing surface of the body being positioned medially with respect to the bottom surface of each foot of the plurality of feet when the customized patient-specific acetabular reaming guide is positioned in contact with the patient'"'"'s coxal bone.

9. The customized patient-specific orthopaedic instrument of claim 1, wherein each foot of the plurality of feet has a longitudinal length substantially different from each other.

10. The customized patient-specific orthopaedic instrument of claim 1, wherein the body includes a sidewall and each arm of the plurality of arms includes a bottom surface,

wherein each bottom surface of the plurality of arms define an angle with respect to the sidewall of the body that is different in magnitude with respect to the angle defined by each other bottom surface of the plurality of arms.

11. The customized patient-specific orthopaedic instrument of claim 1, wherein an angle is defined between each arm of the plurality of arms with respect to another adjacent arm of the plurality of arms when viewed in the top plan view, each of the angles being different in magnitude from each other.

12. The customized patient-specific orthopaedic instrument of claim 1, wherein each foot of the plurality of feet is spaced apart from the body, when viewed in the top plan view, a distance different in magnitude with respect to the distance defined by each other foot of the plurality of feet.

13. The customized patient-specific orthopaedic instrument of claim 1, wherein each arm of the plurality of arms is coupled to the body via a joint such that each arm is movable relative to the body.

14. The customized patient-specific orthopaedic instrument of claim 1, wherein each foot of the plurality of feet is coupled to the corresponding arm via a joint such that each foot is movable relative to the corresponding arm.

15. The customized patient-specific orthopaedic instrument of claim 1, wherein the plurality of arms comprises at least three arms extending from the body.

16. The customized patient-specific orthopaedic instrument of claim 1, wherein each foot of the plurality of feet includes a longitudinal passageway defined therein, each of the longitudinal passageways of the plurality of feet being sized to receive a bone guide pin.

17. A customized patient-specific orthopaedic instrument for facilitating implantation of an acetabular cup prosthesis in a coxal bone of a patient, the customized patient-specific orthopaedic instrument comprising:

a customized patient-specific acetabular reaming guide comprising (i) a body having a longitudinal passageway defined therethrough, (ii) a plurality of arms coupled to the body via corresponding joints such that each arm of the plurality of arms is separately movable with respect to the body, and (iii) a plurality of feet configured to contact a coxal bone of a patient, each foot of the plurality of feet being coupled to a corresponding arm of the plurality of arms via a corresponding joint such that each foot of the plurality of feet is separately movable with respect to the body, each foot of the plurality of feet having a bottom, bone-facing surface having a customized patient-specific negative contour configured to receive a portion of the patient'"'"'s coxal bone having a corresponding positive contour.

18. The customized patient-specific orthopaedic instrument of claim 17, wherein each foot of the plurality of feet includes a longitudinal passageway defined therein, each of the longitudinal passageways of the plurality of feet being sized to receive a bone guide pin.

19. A method for performing an orthopaedic bone reaming procedure on a patient'"'"'s acetabulum to facilitate implantation of an acetabular cup prosthesis in a coxal bone of the patient, the method comprising:

positioning a customized patient-specific acetabular reaming guide on the patient'"'"'s coxal bone, the customized patient-specific acetabular reaming guide including (i) a body having a longitudinal passageway defined therethrough and (ii) a plurality of feet coupled to the body and configured to contact the coxal bone of the patient, each foot of the plurality of feet being positioned relative to the body based on a predetermined degree of version and inclination angles of the acetabular cup prosthesis when implanted in the patient'"'"'s coxal bone;

drilling a pilot hole into the patient'"'"'s acetabulum using the longitudinal passageway of the body as a drill guide;

inserting a bone guide pin into the pilot hole formed in the patient'"'"'s acetabulum;

advancing a cannulated acetabular reamer over the guide pin; and

reaming the patient'"'"'s acetabulum with the cannulated acetabular reamer using the bone guide pin as a guide for the cannulated reamer.

20. A method for performing an orthopaedic bone reaming procedure on a patient'"'"'s acetabulum to facilitate implantation of an acetabular cup prosthesis in a coxal bone of the patient, the method comprising:

positioning a customized patient-specific acetabular reaming guide on the patient'"'"'s coxal bone, the customized patient-specific acetabular reaming guide including (i) a body having a longitudinal passageway defined therethrough and (ii) a plurality of feet configured to contact the coxal bone of the patient, each foot of the plurality of feet being coupled to the body and having a longitudinal passageway defined therethrough, wherein each foot of the plurality of feet is positioned relative to the body based on a predetermined degree of version and inclination angles of the acetabular cup prosthesis when implanted in the patient'"'"'s coxal bone;

drilling a plurality of pilot holes into the patient'"'"'s coxal bone using the longitudinal passageways of the plurality of feet as drill guides;

inserting a bone guide pin through each longitudinal passageway of the plurality of feet and into each of the corresponding pilot holes formed in the patient'"'"'s coxal bone;

securing an acetabular reamer within the longitudinal passageway of the body; and

reaming the patient'"'"'s acetabulum with the acetabular reamer using the plurality of guide pins as guides for the acetabular reamer.