Spacer molds with releasable securement

• US 8,899,959 B2
• Filed: 03/07/2013
• Issued: 12/02/2014
• Est. Priority Date: 10/29/2008
• 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
• Primary Examiner(s): HAUTH, GALEN H
• Application Number:
  US13/788,920
• Publication Number:
  US 20130183398A1
• Time in Patent Office: 635 Days
• Field of Search: 425/451.9, 425/56, 425/577, 264/328.7, 249/155, 249/157
• US Class Current: 425/451.9
• 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 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30329 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2002/30604 modular
• 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 2002/30957 using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2310/00353 Bone cement, e.g. polymethylmethacrylate or PMMA
• CPC Class Codes: B29C 45/66 mechanical

Abstract

A mold for forming a temporary prosthesis has at least two mold members at least partially separable from each other. The at least two mold members cooperatively define a generally enclosed interior cavity for forming the temporary prosthesis. The mold has a securement structure mounted on the at least two mold members for securing the at least two mold members to each other during the forming of the temporary prosthesis. The securement structure is removable from the at least two mold members by hand and without the use of a tool.

Claims

1. A mold for forming a prosthesis, comprising:

at least two mold members configured to be mated to each other and cooperatively define an interior cavity; and

a securement structure, including at least two frame members, a first locking member, and a second locking member, configured to be detachably mounted on an exterior wall of each one of the at least two mold members and secure the at least two mold members to each other without use of a tool,

the at least two frame members configured to be mounted on opposing sides of the mated at least two mold members,

the first locking member configured to contemporaneously engage the at least two frame members and one of the at least two mold members, and

the second locking member configured to contemporaneously engage the at least two frame members and the other one of the at least two mold members.

2. The mold of claim 1, wherein engagement of the first and second locking members with the at least two frame members limits motion of the at least two mold members in a first dimension, and wherein engagement of the first and second locking members and the respective ones of the at least two mold members limits motion of the at least two mold members in a second dimension and a third dimension, the second and third dimensions being perpendicular to each other and perpendicular to the first dimension.

3. The mold of claim 2, wherein motion of the at least two mold members is limited in both directions of each of the first dimension, the second dimension, and the third dimension.

4. The mold of claim 1, wherein at least one of the at least two mold members further comprises an exterior wall having at least one flange defining one of a bore or a recess configured to engage one of the first or the second locking member.

5. The mold of claim 4, wherein the at least one flange comprises a plurality of flanges, each one of the plurality of flanges defining a semi-circular bore or recess.

6. The mold of claim 1, wherein at least one of the first and second locking members comprises a non-threaded pin, a non-threaded bar, or a non-threaded rod.

7. The mold of claim 1, wherein the first and second locking members are disposed such that moving the locking members axially, in a first direction, secures the at least two mold members to each other, and moving the locking members axially, in an opposing second direction, releases the at least two mold members from each other.

8. The mold of claim 1, wherein each one of the at least two frame members is configured to be mounted on a side of each one of the at least two mold members.

9. The mold of claim 1, wherein the first and second locking members interconnect the at least two frame members, the at least two mold members being disposed between, and retained together by, the first and second locking members.

10. The mold of claim 1, wherein the first and the second locking members interconnect the at least two frame members and restrict separation of the at least two mold members away from each other by restricting further separation of the at least two frame members away from each other.

11. The mold of claim 1, wherein the at least two frame members include a plurality of through-holes, the first and second locking members configured to be received by the through-holes.

12. The mold of claim 1, wherein the first and second locking members generally define an axial direction and have an axially fixed retainer, configured to engage one of the at least two frame members, and a retractable retainer, configured to engage the other one of the at least two frame members.

13. The mold of claim 12, wherein the axially fixed retainer comprises a finger pull ring and the retractable retainer comprising a ball detent.

14. The mold of claim 1, further comprising a stem forming section defining a stem cavity within the interior cavity, the stem cavity having an entrance and a movable member, disposed within the interior cavity, configured for opening and closing the stem cavity entrance.

15. The mold of claim 14, wherein the at least two mold members and the securement structure are configured to provide access for moving the movable member while the at least two mold members are secured together.

16. The mold of claim 1, wherein the securement structure is configured to secure a plurality of the at least two mold members, each one of the plurality of the at least two mold members having a different size.

17. The mold of claim 1, wherein the interior cavity is shaped to form the prosthesis either of a first shape, specifically configured for placement on a left leg, or a second shape, specifically configured for placement on a right leg.

18. The mold of claim 17, wherein the interior cavity is shaped to provide the prosthesis with a medial side, and a stem having a central axis generally inclined toward the medial side.

19. The mold of claim 18, wherein the interior cavity is shaped to provide the prosthesis with the medial side, a main portion, and a posterior flange generally extending in a superior-inferior direction from the main portion, the posterior flange having a distal, superior tip disposed on the medial side.

20. The mold of claim 1, wherein the prosthesis is configured as a femoral knee prosthesis.

21. A mold for forming a prosthesis, comprising:

at least two mold members configured to be mated to each other and cooperatively define an interior cavity; and

a securement structure, including at least two frame members, a first locking member, and a second locking member, configured to be detachably mounted on an exterior wall of each one of the at least two mold members and secure the at least two mold members to each other without use of a tool,

the exterior wall of at least one of the at least two mold members comprising a flange defining a semi-circular bore or a recess to engage one of the first or the second locking member,

the at least two frame members configured to be mounted on opposing sides of the mated at least two mold members,

the first locking member configured to contemporaneously engage the at least two frame members and one of the at least two mold members, and

the second locking member configured to contemporaneously engage the at least two frame members and the other one of the at least two mold members.

22. A mold for forming a prosthesis, comprising:

at least two mold members configured to be mated to each other and cooperatively define an interior cavity including a stem cavity, the stem cavity having an entrance and a movable member, disposed within the interior cavity, the movable member configured to open and close the stem cavity entrance; and

a securement structure, including at least two frame members, a first locking member, and a second locking member, configured to be detachably mounted on an exterior wall of each one of the at least two mold members and secure the at least two mold members to each other without use of a tool,

the at least two frame members configured to be mounted on opposing sides of the mated at least two mold members,

the first locking member configured to contemporaneously engage the at least two frame members and one of the at least two mold members, and

the second locking member configured to contemporaneously engage the at least two frame members and the other one of the at least two mold members.