Shoulder prosthesis with anatomic reattachment features

• US 7,229,478 B2
• Filed: 11/23/2004
• Issued: 06/12/2007
• Est. Priority Date: 01/31/1997
• Status: Expired due to Fees

• Current Assignee: MedIdea LLC
• Original Assignee: MedIdea LLC
• Inventors: Masini, Michael A.
• Primary Examiner(s): GHERBI, SUZETTE JAIME J
• Application Number:
  US10/996,415
• Publication Number:
  US 20050090832A1
• Time in Patent Office: 931 Days
• Field of Search: 623 1911- 1914, 623 2319- 2323
• US Class Current: 623/19.11
• CPC Class Codes: A61B 17/8802 Equipment for handling bone cement or other fluid fillers
• CPC Class Codes: A61B 17/8808 with sealing collar for bone cavity
• CPC Class Codes: A61F 2/30723 Plugs or restrictors for sealing a cement-receiving space tools for inserting plugs A61F2/4614; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/30724 Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/3676 Distal or diaphyseal parts of shafts
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4607 of hip femoral endoprostheses
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30571 Leaf springs
• CPC Class Codes: A61F 2002/30726 Centering or guiding rods, e.g. for insertion of femoral shafts
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/3627 with lateral apertures, holes or openings
• CPC Class Codes: A61F 2002/3694 with longitudinal bores
• CPC Class Codes: A61F 2002/4619 for extraction
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

Apparatus and methods are disposed for maintaining the proper positioning of a prosthetic implant having proximal and distal ends within a prepared bone cavity during cement injection and curing. First stabilization means, implantable within the bone cavity, minimize lateral movement of the distal end of the implant, while second stabilization means, physically separate from the means for minimizing lateral movement of the distal end of the implant, minimize both the lateral movement of the proximal end of the implant and the rotational movement of the implant overall. In the preferred embodiment, the second stabilization means includes an apertured cap removably securable to the end of a bone having the prepared cavity through which the implant is inserted and held in place. This cap, which may either be entirely rigid or include a pliable membrane in the vicinity of the aperture, preferably further includes a first port associated with cement injection and a second port associated with cement over-pressurization. In an alternative embodiment, the second stabilization means includes a manually operated mechanism enabling the implant to be temporarily yet rigidly secured thereto in accordance with a desired orientation, preferably affording adjustments along multiple degrees of freedom prior to the rigid securement thereof.

Claims

1. A method of positioning a shoulder implant to achieve a desired orientation for cementation within an intramedullary canal of a humerus having an outer cortex, the method comprising the steps of:

providing a shoulder prosthesis having an articulating joint surface corresponding to a proximal humerus and an intramedullary stem;

positioning the intramedullary stem within an intramedullary canal; and

adjusting the orientation of the prosthesis by referring to a plurality of score marks corresponding to the orientation.

2. The method of claim 1, wherein the score marks indicate the rotational orientation of the prosthesis.

3. The method of claim 1, wherein the score marks indicate the depth of the prosthesis.

4. The method of claim 1, wherein the score marks indicate the lateral or transverse orientation of the prosthesis.