Tool

• US 20060058886A1
• Filed: 09/13/2005
• Published: 03/16/2006
• Est. Priority Date: 09/13/2004
• Status: Abandoned Application

• Current Assignee: Finsbury (Development) Limited (WPP PLC)
• Original Assignee: Finsbury (Development) Limited (WPP PLC)
• Inventors: Wozencroft, Robert Michael
• Application Number:
  US11/225,754
• Publication Number:
  US 20060058886A1
• Time in Patent Office: Days
• US Class Current: 623/22.150
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 90/94 coded with symbols, e.g. text
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/3662 Femoral shafts
• 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 2002/30604 modular
• CPC Class Codes: A61F 2002/30708 Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/343 partial, i.e. not extending along the entire equatorial circumference
• CPC Class Codes: A61F 2002/3432 having apertures for receiving fixation screws
• CPC Class Codes: A61F 2002/3611 Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 Necks
• CPC Class Codes: A61F 2002/4677 using a guide wire
• CPC Class Codes: A61F 2250/0006 for adjusting angular orientation
• CPC Class Codes: A61F 2250/006 modular
• CPC Class Codes: A61F 2250/0084 Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2250/0089 coded with symbols, e.g. dots, numbers, letters, words

Abstract

An alignment trial system for a hip prosthesis comprising: (a) a trial femoral prosthesis comprising a head component, a neck component and a stem component; and (b) a trial acetabular cup prosthesis wherein the head component of the trial femoral prosthesis and the trial acetabular cup prosthesis include interlocking engagement formations and wherein the trial acetabular cup prosthesis includes means to facilitate the formation of a bore in the pelvis. The invention also relates to a method of inserting an acetabular cup prosthesis comprising the steps of: (I) preparing the femur and pelvis for insertion of a femoral prosthesis and an acetabular cup prosthesis; (ii) inserting the alignment trial apparatus of the above first aspect such that the trial femoral prosthesis is located in the prepared femur; (iii) locating the patient'"'"'s hip such that the trial cup prosthesis is seated in the prepared portion of the pelvis; (v) drilling a bore in the pelvis; (vi) removing the alignment trial apparatus; (vii)inserting the acetabular cup prosthesis into the pelvis using the mark as a guide.

Claims

1. An alignment trial system for a hip prosthesis comprising:

(a) a trial femoral prosthesis comprising a head component, a neck component and a stem component; and

(b) a trial acetabular cup prosthesis

wherein the head component of the trial femoral prosthesis and the trial acetabular cup prosthesis include interlocking engagement formations and wherein the trial acetabular cup prosthesis includes means to facilitate the formation of a bore in the pelvis.

2. The alignment trial system according to claim 1 wherein the trial femoral prosthesis is a single piece.

3. The alignment trial system according to claim 1 wherein the trial femoral prosthesis is modular.

4. The alignment trial system according to claim 3 wherein the modular trial femoral prosthesis includes two or more components.

5. The alignment trial system according to claim 3 wherein the modular trial femoral prosthesis includes at least a stem component and a head component.

6. The alignment trial system according to claim 3 wherein the modular trial femoral prosthesis includes a stem component, a head component and at least one neck component which is configured to connect to the head component and to the stem component.

7. The alignment trial system according to claim 6 wherein there are two neck components.

8. The alignment trial system according to claim 3 wherein connections between the components are snap-fit connections.

9. The alignment trial system according to claim 8 wherein the components of the modular trial femoral prosthesis include stop means.

10. The alignment trial system according to claim 1 wherein the head component of the trial femoral prosthesis includes two engagement formations for interlocking with the engagement formation in the trial acetabular cup;

one being suitable for use if the alignment trial system is for use in the left side of the pelvis and the other being suitable for use if the alignment trial system is for use in the right side of the pelvis.

12. The alignment trial system according to claim 1 wherein the engagement means are a snap-fit.

13. The alignment trial system according to claim 1 wherein the means to facilitate the drilling of the bore comprises a flange extending from a rim of the trial acetabular cup prosthesis having an aperture therein.

14. The alignment trial system according to claim 1 wherein the means to facilitate the drilling of the bore comprises two flanges extending from a rim of the trial acetabular cup such that two pegs can be used to hold the cup in place during the drilling procedure.

11. The alignment trial system according to claim 11 wherein indicia is included to identify the engagement formation that is suitable for use in the right side and that which is suitable for use in the left side.

15. A surgical tool for gripping an acetabular cup prosthesis for implantation in a surgically prepared socket in a hip of a patient, the tool comprising an elongate body having a first end for releasable engagement with the prosthesis and a guidewire extending from the tool for insertion into a bore drilled into the pelvis.

16. A surgical tool according to claim 15 wherein the guidewire extends along at least a portion of the tool.

19. A method according to claim 17 wherein the acetabular cup is inserted using the tool of claim 15 wherein the guidewire in the tool is inserted into the bore.

17. A method of inserting an acetabular cup prosthesis comprising the steps of:

(i) preparing the femur and pelvis for insertion of a femoral prosthesis and an acetabular cup prosthesis;

(ii) inserting the alignment trial apparatus of the above first aspect such that the trial femoral prosthesis is located in the prepared femur;

(iii) locating the patient'"'"'s hip such that the trial cup prosthesis is seated in the prepared portion of the pelvis;

(v) drilling a bore in the pelvis;

(vi) removing the alignment trial apparatus;

(vii) inserting the acetabular cup prosthesis into the pelvis using the mark as a guide.

18. A method according to claim 17 wherein the location is preferably carried out with about 0°

flexion of the hip.