METHOD AND APPARATUS FOR PERFORMING ANTERIOR HIP SURGERY

• US 20180280158A1
• Filed: 06/01/2018
• Published: 10/04/2018
• Est. Priority Date: 06/03/2013
• Status: Active Grant

• Current Assignee: STEPHEN B. MURPHY
• Original Assignee: M.D. Stephen B. Murphy, William S. Murphy
• Inventors: Murphy, Stephen B., Murphy, William S.
• Granted Patent: US 10,456,274 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/1746 for the acetabulum
• 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 2034/207 Divots for calibration
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 34/25 User interfaces for surgical systems
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/4658 for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2002/4668 for measuring angles
• CPC Class Codes: A61F 2002/4687 Mechanical guides for implantation instruments

Abstract

An apparatus registers a patient'"'"'s pelvis during surgery by establishing a patient-specific, supine pelvic reference plane. The apparatus may include an elongated support arm having three legs, at least two of which may be moveable along the arm. The first leg may contact the patient'"'"'s right anterior superior iliac spines (ASIS), the second leg may contact the left ASIS, and the third leg may contact an anterior aspect of the ischium of the patient'"'"'s pelvis below the acetabulum of the hip being operated on. The distances between the first leg and the second and third legs may be determined preoperatively so that the legs dock to the desired points. The apparatus may further include a direction indicator configured to point in a desired orientation for inserting an acetabular cup component in the patient'"'"'s acetabulum.

Claims

1. An apparatus for establishing a supine pelvic reference plane for a specific patient, the apparatus comprising:

an elongated support arm;

a first leg attached to said elongated support arm;

a second leg slidably attached to said elongated support arm; and

a third leg slidably attached to said elongated support arm, wherein;

the first, second, and third legs have tips, and

the second and third legs are slidably adjusted relative to the elongated support arm such that;

the tip of the first leg contacts a left anterior superior iliac spine of the specific patient,

the tip of the second leg contacts a right anterior superior iliac spine of the specific patient, and

the tip of the third leg contacts an anterior aspect of the ischium of the specific patient'"'"'s pelvis below the acetabulum, and further wherein

the apparatus defines the supine pelvic reference plane for the specific patient, and

the supine pelvic plane has a known relationship to a standard reference plane for the specific patient.

2. The apparatus of claim 1 further comprising:

a directional indicator attached to said elongated support arm, said directional indicator defining a predetermined orientation relative to the apparatus.

3. The apparatus of claim 2 wherein said elongated support arm defines a nominal plane, and the predetermined orientation is relative to the nominal plane defined by the elongated support arm.

4. The apparatus of claim 1 further comprising:

a platform slidably attached to said elongated support arm, wherein said third leg is attached to said platform.

5. The apparatus of claim 4 wherein said third leg is slidably attached to said platform such that said third leg is moveable in a direction orthogonal to a longitudinal axis of said elongated support arm.

6. The apparatus of claim 5 further comprising:

a directional indicator mounted to said platform, said directional indicator defining a predetermined orientation relative to the apparatus.

7. The apparatus of claim 6 wherein said elongated support arm defines a nominal plane, and the directional indicator is fixedly adjustable in

a first direction that is within the nominal plane defined by said elongated support arm, and

a second direction that is normal to the nominal plane defined by said elongated support arm.

8. The apparatus of claim 7 wherein the directional indicator is pivotable in the first and second directions.

9. The apparatus of claim 1 wherein

the first, second, and third legs are releasably attached to the elongated support arm, and

the elongated support arm is reversible for use on a left hip and a right hip of the specific patient.

10. The apparatus of claim 1 wherein said elongated support arm defines a nominal plane, and the nominal plane defined by the elongated support arm is parallel to the plane defined by:

the left anterior superior iliac spine of the specific patient;

the right anterior superior iliac spine of the specific patient; and

the anterior aspect of the ischium of the specific patient'"'"'s pelvis below the acetabulum.

11. The apparatus of claim 10 wherein the first, second, and third legs have equal lengths.

12. A method comprising:

defining a standard pelvic plane for a patient;

defining a supine pelvic reference plane for the patient;

establishing a mathematical relationship between the standard pelvic plane and the supine pelvic reference plane;

determining an orientation for a prosthetic component relative to the standard pelvic plane;

translating the orientation to the supine pelvic reference plane;

docking a registration device to predetermined points on the patient'"'"'s pelvis; and

providing a directional indicator on the registration device, where the directional indicator is configured to define the orientation for the prosthetic component.

13. The method of claim 12 wherein the standard pelvic plane is an anterior pelvic (AP) plane.

14. The method of claim 12 wherein the supine pelvic reference plane includes:

a first point at a left anterior superior iliac spine of the patient;

a second point at a right anterior superior iliac spine of the patient; and

a third point at an anterior aspect of the ischium of the patient'"'"'s pelvis below the acetabulum.

15. The method of claim 14 wherein

the registration device has first, second, and third legs that terminate in respective tips,

the predetermined points include:

the left anterior superior iliac spine of the patient;

the right anterior superior iliac spine of the patient; and

the anterior aspect of the ischium of the patient'"'"'s pelvis below the acetabulum, and

the tips of the first, second, and third legs of the registration device contact or are proximate to the predetermined points.

16. The method of claim 15 wherein the registration device includes an elongated support arm, and the second and third legs are slidable along the elongated support arm, the method further comprising:

determining locations along the elongated support arm for the second and third legs; and

adjusting the second and third legs along the elongated support arm to the determined locations.

17. The method of claim 12 wherein the prosthetic component is an acetabular cup component.

18. The method of claim 12 further comprising:

utilizing a three-dimensional computer model to the define the standard pelvic plane and the supine pelvic reference plane.

19. The method of claim 18 further comprising:

obtaining one or more images of the patient'"'"'s pelvis; and

generating the three-dimensional computer model of the patient'"'"'s pelvis from the one or more images.

20. A surgical registration device comprising:

a support bar having

first and second ends,

a longitudinal axis, and

a nominal plane;

a first leg removably attached to the first end of the support bar;

a second leg removably and adjustably attached to the second end of the support bar, where the second leg is adjustable in a direction along the longitudinal axis;

a third leg removably and adjustably attached to the support bar, where the third leg is adjustable in a first direction along the longitudinal axis and in a second direction orthogonal to the longitudinal axis; and

a direction indicator mounted to the support bar, the direction indicator defining a predetermined orientation relative to the nominal plane defined by the support bar.