Acetabular cup inserting instrument

• US 4,716,894 A
• Filed: 08/27/1986
• Issued: 01/05/1988
• Est. Priority Date: 08/27/1986
• Status: Expired due to Term

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Lazzeri, Mark A., Hamm, John E.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): SHEDD, CHARLES W
• Application Number:
  US06/900,869
• Time in Patent Office: 496 Days
• Field of Search: 128/92 V, 128/92 VT, 128/92 VP, 128/92 VL
• 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 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection

Abstract

An acetabular cup inserting instrument comprises a first handle and a second handle extending therefrom. The second handle is selectively rotatable about the first handle and selectively lockable in a desired position with respect to the first handle.

Claims

1. An acetabular cup inserting instrument comprising a first elongated handle and a second elongated handle extending from the first handle, the second handle being selectively rotatable about the first handle and selectively lockable in a desired position with respect to the first handle, and wherein the first elongated handle includes a proximal end, a distal end and an interconnecting intermediate section therebetween.

2. The instrument of claim 1 wherein the second handle includes a first sleeve adapted to fit about the first handle for interconnecting the second handle to the first handle, the instrument including a securing means to selectively lock the second handle in the desired position with respect to the first handle, and the first sleeve being freely rotatable about the first handle when the securing means is not operatively locking the second handle in the desired position.

3. The instrument of claim 2 wherein the instrument further includes a second sleeve which is located distally to the first sleeve, the second sleeve is adapted to fit about the first handle and is rigidly fixed thereto, and wherein the securing means includes a first radial disc extending from the end of the first sleeve closest to the distal end of the first handle and a second radial disc extending from the end of the second sleeve closest to the proximal end thereof and facing toward the first radial disc, the first disc includes a splined surface facing toward the second disc, and the second disc includes a mating splined surface facing toward the splined surface of the first disc, the securing means further including a locking means to selectively maintain the splined surfaces in locking engagement, thus fixing the second handle in the desired position with respect to the first handle when the locking means is effecting locking engagement, and enabling the second handle to freely rotate about the first handle when the locking means is not effecting locking engagement.

4. The instrument of claim 3 wherein the locking means to selectively maintain the splined surfaces in locking engagement is a third sleeve member adapted to fit about the first handle and located proximally to the first sleeve, the first handle including external threads on a portion thereof and the third sleeve including mating internal threads for engagement with the external threads to enable the third sleeve to be manually rotated about the first handle via the threaded engagement into selective contact with the first sleeve, thus applying force against the first sleeve to maintain the mating splined surfaces in engagement with one another, thereby fixing the position of the second handle, the third sleeve may also be selectively manually rotated out of contact with the first sleeve and retracted toward the proximal end of the first handle, thus releasing the force against the first sleeve of the second handle to enable the second handle the freedom of movement to disengage the splined surfaces, thus enabling the second handle the ability to freely rotate about the first handle.

5. The instrument of claim 1 wherein the second handle is at an angle of approximately 45°

to the first handle.

6. The instrument of claim 1 wherein the second handle is a T-shaped handle.

7. The instrument of claim 1 wherein the instrument further includes a means for engaging the acetabular cup.

8. The instrument of claim 7 wherein the means for engaging the acetabular cup is a threaded stud extending from the distal end of the first handle for engaging a corresponding threaded hole in the acetabular cup which is being inserted.

9. The instrument of claim 1 wherein the second handle is selectively rotatable 360°

about the first handle.

10. A method of inserting an acetabular cup with an instrument having a first elongated handle and a second elongated handle extending from the first handle, wherein the second handle is selectively rotatable about the first handle and selectively lockable via a securing means in a desired position with respect to the first handle, the method comprising the following steps:

(a) releasably attaching the instrument to an acetabular cup;

(b) rotating the second handle about the first handle to the desired position;

(c) locking the second handle in the desired position via the securing means;

(d) aligning the cup to the proper anatomic orientation; and

(e) properly positioning and inserting the cup in the prepared acetabulum.

11. The method of claim 10 further comprising the following additional steps:

(a) releasing the securing means so that the second handle is free to rotate about the first handle; and

(b) removing the instrument from the acetabular cup.

12. An acetabular cup inserting instrument comprising a first elongated handle and a second elongated handle extending from the first handle, the second handle being selectively rotatable about the first handle and selectively lockable in a desired position with respect to the first handle, and wherein the first elongated handle includes a proximal end, a distal end and an interconnecting intermediate section therebetween, and wherein the second handle includes a first sleeve adapted to fit about the first handle for interconnecting the second handle to the first handle, the instrument including a securing means to selectively lock the second handle in the desired position with respect to the first handle, and the first sleeve being freely rotatable about the first handle when the securing means is not operatively locking the second handle in the desired position, and wherein the instrument further includes a second sleeve which is located distally to the first sleeve, the second sleeve is adapted to fit about the first handle and is rigidly fixed thereto, and wherein the securing means includes a first radial disc extending from the end of the first sleeve closest to the distal end of the first handle and a second radial disc extending from the end of the second sleeve closest to the proximal end thereof and facing toward the first radial disc, the first disc includes a splined surface facing toward the second disc, and the second disc includes a mating splined surface facing toward the splined surface of the first disc, the securing means further including a locking means to selectively maintain the splined surfaces in locking engagement, thus fixing the second handle in the desired position with respect to the first handle when the locking means is effecting locking engagement, and enabling the second handle to freely rotate about the first handle when the locking means is not effecting locking engagement.

13. An acetabular cup inserting instrument comprising a first elongated handle and a second elongated handle extending from the first handle, the second handle being selectively rotatable about the first handle and selectively lockable in a desired position with respect to the first handle, and wherein the first elongated handle includes a proximal end, a distal end and an interconnecting intermediate section therebetween, and wherein the second handle includes a connecting means adapted to fit about the first handle for interconnecting the second handle to the first handle, the instrument including a securing means to selectively lock the second handle in the desired position with respect to the first handle, and the connecting means being freely rotatable about the first handle when the securing means is not operatively locking the second handle in the desired position.

14. The instrument of claim 13 wherein the securing means includes a first radial disc extending from the connecting means and a second radial disc extending from the first handle and in a fixed relation to the first handle, and facing toward the first radial disc, the first disc includes a splined surface facing toward the second disc, and the second disc includes a mating splined surface facing toward the splined surface of the first disc, the securing means further including a locking means to selectively maintain the splined surfaces in locking engagement, thus fixing the second handle in the desired position with respect to the first handle when the locking means is effecting locking engagement, and enabling the second handle to freely rotate about the first handle when the locking means is not effecting locking engagement.

15. The instrument of claim 13 wherein the securing means includes a projection means selectively engageable with a corresponding groove means with one of these two means being incorporated on the rotatable connecting means and the other being incorporated on the first handle in a fixed radial orientation, thus fixing the second handle in the desired position with respect to the first handle when the projection means is operatively engaged with the groove means, and enabling the second handle to freely rotate about the first handle when the projection means is not operatively engaged with the groove means.