Acetabular impactor

• US 7,037,310 B2
• Filed: 10/21/2003
• Issued: 05/02/2006
• Est. Priority Date: 10/21/2003
• Status: Expired due to Term

• Current Assignee: MicroPort Orthopedics Holdings, Inc. (MicroPort Scientific Corp.)
• Original Assignee: Wright Medical Technology Incorporated (Stryker Corporation)
• Inventors: Murphy, Stephen B.
• Primary Examiner(s): Robert, Eduardo
• Assistant Examiner(s): REIMERS, ANNETTE R
• Application Number:
  US10/691,143
• Publication Number:
  US 20050085823A1
• Time in Patent Office: 924 Days
• Field of Search: 606/81, 606/91, 606/99, 606/100, 623 2221- 39
• US Class Current: 606/91
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4632 using computer-controlled surgery, e.g. robotic surgery
• CPC Class Codes: A61F 2002/4635 using minimally invasive surgery
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• CPC Class Codes: A61F 2250/0064 Sets comprising a plurality of prosthetic parts of different sizes

Abstract

An improved acetabular impactor, especially suitable for use in minimally invasive hip surgeries, is disclosed. The impactor is simple in design and operation and spatially optimized. In particular, the impactor is designed to remotely detach the acetabular shell from the impactor via different potential mechanical connections.

Claims

1. An acetabular impactor, comprising:

an impactor body having first and second ends;

a releasable connection for attaching an acetabular shell to said impactor;

a remote actuator for releasing the connection between said shell and said impactor;

said remote actuator manipulated distant said first and second ends, and

said actuator including a mechanical drive, wherein said mechanical drive can transfer rotational motion from one axis to another.

2. The acetabular impactor according to claim 1, wherein:

said remote actuator is swingable independent of said impactor body.

3. The acetabular impactor according to claim 1, wherein said mechanical drive includes a universal-joint.

4. The acetabular impactor according to claim 1, wherein said mechanical drive includes a bevel gear.

5. The acetabular impactor according to claim 1, wherein at least a portion of the actuator is within said body.

6. The acetabular impactor according to claim 5, wherein said body is rigid.

7. The acetabular impactor according to claim 1, wherein said releasable connection comprises a threaded connection.

8. The acetabular impactor according to claim 1, wherein:

said first end for receiving an impact of a hammering device;

said second end having said connection for attaching an acetabular shell thereto, said connection having an attachment axis;

a first leg extending from said connection and parallel to said attachment axis;

a second leg, acutely angled with respect to said first leg, and extending from said first leg;

a third leg, extending at an angle with respect to said second leg; and

a fourth leg, acutely angled with respect to said third leg, and extending parallel and opposite to said first leg.

9. The acetabular impactor of claim 8, wherein the angle between said second and third legs is a right angle and said second and third legs are substantially the same length.

10. The acetabular impactor of claim 9, wherein said legs are rigid and of a fixed length.

11. The acetabular impactor of claim 10, wherein said first and fourth legs are coaxial.

12. The acetabular impactor of claim 9, wherein said acute angles may be varied.

13. The acetabular impactor of claim 12, wherein said first and fourth legs are separate members from said second and third legs, and wherein said acute angles may be varied by varying the angles between said separate legs.

14. The acetabular impactor of claim 8, wherein:

said shell has an inner radius; and

the length of said first leg is less than said inner radius.

15. The acetabular impactor of claim 14, wherein said length of said first leg being the smallest length that does not cause impingement of said shell and said second leg.

16. The acetabular impactor of claim 14, wherein the length of said second leg is greater than said inner radius.

17. The acetabular impactor of claim 8, further comprising a navigation frame.

18. The acetabular impactor according to claim 8, wherein said releasable connection comprises a threaded connection.

19. The acetabular impactor according to claim 1, wherein:

said first end for receiving an impact of a hammering device;

said second end having said connection for attaching an acetabular shell, said acetabular shell having an inner radius thereto;

a first leg extending from said connection and parallel to said attachment axis;

a second leg, acutely angled with respect to said first leg, and extending from said first leg;

the length of said first leg is less than said inner radius.

20. The acetabular impactor according to claim 1, wherein said mechanical drive is a solid flexible coupling.