Acetabular cup positioner and method

• US 4,475,549 A
• Filed: 01/18/1982
• Issued: 10/09/1984
• Est. Priority Date: 01/18/1982
• Status: Expired due to Term

• Current Assignee: Richards Medical Company
• Original Assignee: Richards Medical Company
• Inventors: Oh, Indong
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): SHEDD, CHARLES W
• Application Number:
  US06/340,028
• Time in Patent Office: 995 Days
• Field of Search: 128/303 R, 128/92 R, 128/92 E, 128/92 EB, 128/92 EA
• US Class Current: 606/91
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2250/0006 for adjusting angular orientation

Abstract

An acetabular cup positioner for positioning an acetabular cup during hip surgery comprising a head having an axis which is receivable in the acetabular cup, a first arm coupled to the head and extending from the head at an acute angle, and a second arm coupled to the first arm at a location spaced from the head. The second arm extends generally parallel to the axis of the head, and the arms and the axis are in substantially the same plane. First and second handles are coupled to the first arm such that the anteversion angle can be established for the right and left hips by aligning the first and second handles, respectively, with the patient axis.

Claims

1. An acetabular cup positioner for positioning an acetabular cup during hip surgery on a patient to establish abduction and anteversion angles of the acetabular cup in the acetabulum, said acetabular cup positioner comprising:

acetabular cup engaging means for engaging the acetabular cup and moving the acetabular cup in the acetabulum to provide the desired abduction and anteversion angles of the acetabular cup;

arm means coupled to the acetabular cup engaging means and manually movable to move the acetabular cup engaging means to position the acetabular cup in the acetabulum; and

said arm means including means for sighting along the axis of the patient to establish the anteversion angle.

2. An acetabular cup positioner as defined in claim 1 wherein said sighting means establishes an anteversion angle for the acetabular cup of from about 10 degrees to about 25 degrees when said sighting means is sighted along the patient axis.

3. An acetabular cup positioner as defined in claim 1 wherein said sighting means is a first sighting means and establishes the anteversion angle for the right hip and said arm means includes second means for sighting along the axis of the patient to establish the anteversion angle for the left hip.

4. An acetabular cup positioner as defined in claim 1 wherein said sighting means includes a handle alignable with the patient axis to establish an anteversion angle of from about 10 degrees to about 25 degrees.

5. An acetabular cup positioner as defined in claim 1 wherein said arm means includes means for sighting relative to the patient to establish an abduction angle for the acetabular cup.

6. An acetabular cup positioner as defined in claim 1 wherein said arm means includes a first arm extending from the acetabular cup engaging means at an angle such that when the first arm extends transverse to the patient axis, the acetabular cup has an abduction angle of from about 35 degrees to about 45 degrees and said sighting means includes a handle coupled to the first arm at an angle such that with the handle extending generally parallel to the patient axis, the acetabular cup has an anteversion angle of from about 10 degrees to about 25 degrees.

7. An acetabular cup positioner as defined in claim 1 wherein said acetabular cup engaging means has an opening through which a member can be inserted to at least assist in removing the cup positioner from the acetabular cup.

8. An acetabular cup positioner for positioning an acetabular cup comprising:

a head at least partially receivable in the acetabular cup which is to be positioned, said head having an axis;

a first arm coupled to the head, at least a portion of the first arm extending from the head at an acute angle to the axis;

a second arm coupled to the first arm at a location spaced from the head, said first and second arms and the axis of the head being substantially in a first plane; and

a handle coupled to the first arm and extending generally transversely to the first arm, said handle forming an acute angle with said first plane of from about 10 degrees to about 25 degrees as viewed in a reference plane which is perpendicular to said first plane and in which said axis appears as a line.

9. An acetabular cup positioner as defined in claim 8 wherein said handle is a first handle and said acetabular cup positioner includes a second handle coupled to said first arm and extending generally transverse to the first arm, said second handle forming an angle as viewed from said reference plane with said first handle of from about 20 degrees to about 50 degrees with said first plane substantially bisecting said last-mentioned angle.

10. An acetabular cup positioner as defined in claim 9 wherein a portion of said first arm extends beyond said first location whereby said location is intermediate said portions of said first arm and said handles are mounted on the portion of the first arm which extends beyond said location.

11. An acetabular cup as defined in claim 10 wherein said angles formed by the first and second handles are equal, said head has an opening through which a member can be inserted to at least assist in removing the head from the acetabular cup and said first arm has an axis which is spaced from the axis of the head.

12. An acetabular cup positioner as defined in claim 8 wherein said first arm has an axis which is spaced from the axis of the head.

13. A method of positioning an acetabular cup in the acetabulum of a patient during surgery utilizing an acetabular cup positioner which includes an acetabular cup engaging member, an arm coupled to the acetabular cup engaging member and sighting means on the arm and wherein the acetabular cup engaging member engages the acetabular cup and the acetabular cup is seated within the acetabulum, said method comprising:

manually moving the arm means to establish the desired abduction angle; and

aligning the sighting means with the patient axis to establish the anteversion angle.

14. A method as defined in claim 13 wherein the arm includes second sighting means and said method includes manually moving said arm to place said second sighting means generally transverse to the patient axis to establish the abduction angle.