Curved acetabular shell impaction instrument and method of use

• US 20030229356A1
• Filed: 02/27/2003
• Published: 12/11/2003
• Est. Priority Date: 06/10/2002
• Status: Abandoned Application

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Dye, Donald
• Application Number:
  US10/375,336
• Publication Number:
  US 20030229356A1
• Time in Patent Office: Days
• US Class Current: 606/99
• 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: 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 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3406 Oblong apertures
• CPC Class Codes: A61F 2002/3443 with an anti-luxation elevated rim portion, e.g. on the inner shell
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• 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 2250/0006 for adjusting angular orientation

Abstract

A method and apparatus for performing minimally invasive hip surgery for implanting a prosthetic acetabular component into a natural acetabulum. The method and apparatus include an acetabular shell impaction instrument for aligning and impacting the acetabular component into the acetabulum. The impaction instrument includes a curved section to provide access to the acetabulum through a minimally invasive incision.

Claims

1. A method for using minimally invasive surgery to implant a prosthetic acetabular shell and insert into a natural acetabulum, comprising the steps of:

incising a hip with a minimally invasive incision;

exposing at least a portion of an acetabular joint through the incision;

providing an acetabular impaction instrument having an elongated body extending from an impaction end to a connection end, the body having an enlarged arc connected to the connection end, wherein the arc is adapted to at least partially fit into the incision;

attaching the acetabular shell to the connection end of the acetabular impaction instrument;

positioning the acetabular shell into the natural acetabulum with the acetabular impaction instrument;

impacting the impaction end of the acetabular impaction instrument to drive the acetabular shell into the natural acetabulum;

disengaging the acetabular impaction instrument from the acetabular shell while the acetabular shell is seated in the natural acetabulum;

removing the acetabular impaction instrument form the incision; and

closing the incision.

2. The method of claim 1 further comprising the step of providing the body of the acetabular impaction instrument with two sections that form substantially an entire length of the body with the arc forming one of the sections.

3. The method of claim 1 further comprising the step of providing the body of the acetabular impaction instrument with a longitudinal axis that extends through the impaction and connection ends.

4. The method of claim 3 further comprising the step of providing the arc with a curved section that substantially falls outside of the longitudinal axis.

5. The method of claim 1 further comprising the step of providing the arc to form approximately one half of a length of the body.

6. The method of claim 1 wherein the step of incising a hip creates the minimally invasive incision with a length of about 2½

inches to about 4 to 5 inches.

7. The method of claim 1 further comprising the step of positioning at least a portion of the arc into the minimally invasive incision in order to perform the step of positioning the acetabular shell into the natural acetabulum.

8. A method for implanting a prosthetic acetabular component into a natural acetabulum of a patient, the method comprising the steps of:

incising a hip to provide surgical access to an acetabular joint;

providing an acetabular impaction instrument having a body extending from an impaction end to a connection end, the body having a curved section connected to the connection end and a straight section connected to the impaction end;

attaching the acetabular component to the connection end of the acetabular impaction instrument;

positioning the acetabular component into the natural acetabulum with the acetabular impaction instrument until at least a portion of the curved section is positioned into the patient;

impacting the impaction end of the acetabular impaction instrument to drive the acetabular component into the natural acetabulum;

disengaging the acetabular impaction instrument from the acetabular component while the acetabular component is embedded in the natural acetabulum;

removing the acetabular impaction instrument from the patient; and

closing the incision.

9. The method of claim 8 further comprising the step of providing the curved section to have substantially a shape of a partial ellipse.

10. The method of claim 8 wherein the step of incising a hip produces an incision with a length of about 2½

inches to about 5 inches.

11. The method of claim 10 further comprising the step of providing the curved section to have a shape adapted to position the acetabular component into the natural acetabulum while the straight section is positioned outside of the patient.

12. The method of claim 8 further comprising the step of providing the curved section to have a length of about 6 inches to 8 inches.

13. The method of claim 12 further comprising the step of providing the curved section to have a curvature of about 6 inches to 10 inches.

14. The method of claim 13 further comprising the step of aligning the acetabular component in the natural acetabulum with the acetabular impaction instrument before the step of impacting the impaction end of the acetabular impaction instrument.

15. A method for implanting a prosthetic acetabular component into a natural acetabulum of a patient, the method comprising the steps of:

incising the patient with an incision from about 2½

inches to about 5 inches to provide surgical access to an acetabular joint;

preparing the natural acetabulum to receive the acetabular component;

providing an acetabular impaction instrument having a body extending from an impaction end to a connection end, the body having a curved section adjacent the connection end;

attaching the acetabular component to the connection end of the acetabular impaction instrument;

positioning the acetabular component into the natural acetabulum with the acetabular impaction instrument until at least a portion of the curved section is positioned into the incision;

impacting the impaction end of the acetabular impaction instrument to drive the acetabular component into the natural acetabulum;

disengaging the acetabular impaction instrument from the acetabular component while the acetabular component is embedded in the natural acetabulum;

removing the acetabular impaction instrument from the patient; and

closing the incision.

16. The method of claim 15 further comprising the step of providing the curved section to have a length of about 7 inches.

17. The method of claim 16 further comprising the step of providing the curved section to have a curvature of about 8 inches.

18. The method of claim 17 further comprising the step of providing the curved section with a substantially constant curvature.

19. The method of claim 17 further comprising the step of providing the body with a longitudinal axis extending through both the impaction and connection ends.

20. The method of claim 15 further comprising the step of providing the curved section to have a shape selected from one of an ellipse, arc, and partial circle.