Spacer mold and methods therefor

• US 8,480,389 B2
• Filed: 07/09/2010
• Issued: 07/09/2013
• Est. Priority Date: 12/07/2007
• Status: Active Grant

• Current Assignee: Zimmer Orthopaedic Surgical Products (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Orthopaedic Surgical Products (Zimmer Biomet Holdings, Inc.)
• Inventors: Haney, Sean, Sporer, Scott M., Hawkins, Michael E.
• Primary Examiner(s): Davis, Robert B
• Application Number:
  US12/833,346
• Publication Number:
  US 20100297276A1
• Time in Patent Office: 1,096 Days
• Field of Search: 249/55, 249/61, 249/83, 249/91, 249/158, 425/117, 425/567
• US Class Current: 425/117
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30672 temporary
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30693 Air venting means
• CPC Class Codes: A61F 2002/30957 using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/30975 made of two halves
• CPC Class Codes: A61F 2250/0007 for adjusting length
• CPC Class Codes: A61F 2310/00353 Bone cement, e.g. polymethylmethacrylate or PMMA
• CPC Class Codes: A61F 2310/00952 Coating, pre-coating or prosthesis-covering structure made of bone cement, e.g. pre-applied PMMA cement mantle
• CPC Class Codes: B29C 33/10 with incorporated venting means
• CPC Class Codes: B29C 33/306 Exchangeable mould parts, e.g. cassette moulds, mould inserts moulds with exchangeable mould parts for injection moulding B29C45/2673; mounting of exchangeable mould inserts for injection moulding B29C45/2675
• CPC Class Codes: B29C 33/308 Adjustable moulds for injection moulding B29C45/376
• CPC Class Codes: B29L 2031/7532 Artificial members, protheses

Abstract

A hip spacer mold forming a spacer with a spacer stem connected to a spacer head has a stem portion for forming a spacer stem. The hip spacer mold also has a plurality of interchangeable head modules configured for alternatively forming spacer heads of a plurality of different predetermined sizes. The head modules are configured to be disposed adjacent the stem portion.

Claims

1. A mold comprising:

a body having a head end and a stem end and defining an interior cavity having a length, the head end including at least one removable section and at least one grasping portion connected to the at least one removable section;

a port in communication with the interior cavity and configured to be in releasable connection to a pressurized injector;

an adjusting member slidingly engaged with the body at the stem end, the adjusting member including a plurality of selectable positions to vary the length of the interior cavity; and

a retaining mechanism configured to releasably engage the adjusting member at any one of the plurality of selectable positions, wherein the retaining mechanism is outwardly biased to retain the adjusting member in a select position.

2. The mold of claim 1, the adjusting member further including a cupped portion configured to form a rounded stem end of a molded object.

3. The mold of claim 1, wherein the plurality of selectable positions corresponds to a respective plurality of positions of the cupped portion within the interior cavity length.

4. The mold of claim 3, wherein each one of the plurality of selectable positions comprises a hole or a slot.

5. The mold of claim 3, wherein the retaining mechanism includes a flexible member.

6. The mold of claim 5, wherein the stem end further comprises a passage extending transverse to the interior cavity length and having a passage opening and a closed end opposite the passage opening, the closed end configured to engage an end of the flexible member.

7. The mold of claim 6, wherein the retaining mechanism is inserted into the passage opening to releasably engage a select one of the plurality of selectable positions.

8. The mold of claim 1, wherein the retaining mechanism comprises a pin.

9. The mold of claim 6, wherein the retaining mechanism is outwardly biased at the flexible member end.

10. The mold of claim 9, wherein the passage closed end comprises at least one tapered section and wherein the outwardly biased flexible member end engages the at least one tapered section.

11. The mold of claim 1, wherein the body further comprises at least one grasping portion adjacent the head end.

12. The mold of claim 11, wherein the grasping portion is generally annular.

13. The mold of claim 11, wherein the body further comprises at least one removable section adjacent the head end.

14. The mold of claim 13, wherein the at least one grasping portion is integrally formed with the at least one removable section.

15. The mold of claim 13, wherein the at least one grasping portion comprises at least two grasping portions and the at least one removable section comprises at least two removable sections.

16. The mold of claim 1, further comprising a plug configured for placement in at least a portion of the port.

17. The mold of claim 5, wherein the retaining mechanism is configured to engage a select one of the plurality of selectable positions when the select one of the plurality of selectable positions is disposed adjacent the passage.

18. An adjustable mold, comprising:

an adjusting member comprising a cupped portion configured to form a rounded end of a molded object and a positioning member defining a plurality of selectable positions;

a body member having a longitudinal axis and an end portion, the end portion including an opening configured to receive the adjusting member and a passage extending transverse to the longitudinal axis, the passage having a passage opening and a closed end opposite the passage opening; and

a retaining mechanism configured to be received in the passage opening and outwardly biased to releasably engage the passage closed end,

wherein the body member and the adjusting member cooperate to define a mold cavity having a length, and the adjusting member is movably engaged with the body member to vary the mold cavity length when the mold is fully assembled.

19. The mold of claim 18, wherein the plurality of selectable positions of the positioning member correspond to a respective plurality of axial positions of the cupped portion within the mold cavity.

20. The mold of claim 18, wherein the retaining mechanism is further configured to releasably engage the positioning member.

21. The mold of claim 20, wherein the retaining mechanism is configured to releasably engage any one of the plurality of selectable positions.

22. The mold of claim 21, wherein the retaining mechanism is configured to engage a select one of the plurality of selectable positions when the select one of the plurality of selectable positions is disposed adjacent the passage.

23. The mold of claim 22, wherein the retaining mechanism is inserted into the passage opening to releasably engage the select one of the plurality of selectable positions.

24. The mold of claim 20, wherein the retaining mechanism is configured to releasably engage a hole or a slot in the positioning member.

25. The mold of claim 18, wherein the retaining mechanism comprises a pin.