Modular implant for replacing end of radius and having drainage passage for trapped fluid

• US 6,270,529 B1
• Filed: 09/01/1999
• Issued: 08/07/2001
• Est. Priority Date: 09/01/1999
• Status: Expired due to Term

• Current Assignee: Wright Medical Technology Incorporated (Stryker Corporation)
• Original Assignee: Wright Medical Technology Incorporated (Stryker Corporation)
• Inventors: Raynor, Donald E., Johnson, James A., Terrill-Grisoni, Lauralan, King, Graham J. W., Patterson, Stuart D., Grusin, Nathaniel Kelley, Theis-Handwerker, Maureen
• Primary Examiner(s): Smith, Jeffrey A.
• Application Number:
  US09/388,093
• Time in Patent Office: 706 Days
• Field of Search: 623/20.11, 623/20.12, 623/20.13, 623/23.39, 623/23.42, 623/18.11, 623/16.11, 623/11.11, 623/116
• US Class Current: 623/20.11
• CPC Class Codes: A61F 2/3804 for elbows
• CPC Class Codes: A61F 2/4605 of elbows
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30143 hexagonal
• CPC Class Codes: A61F 2002/30233 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30479 using a locking ball
• CPC Class Codes: A61F 2002/30505 spring biased
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30691 Drainage means, e.g. for evacuating blood or other fluids
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/3827 Radial components
• CPC Class Codes: A61F 2002/4666 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0064 : Sets comprising a plurality of prosthetic parts of different sizes
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: Y10S 623/911 : Bone

Abstract

A system including modular radial head implants, sizers for trial reduction of the joint, and instrumentation for preparing the radial head, implanting the sizers, assembling the implants.

Claims

1. A modular implant for replacing the head of the proximal end of a radius and for articulating with the capitellum of a humerus, said implant comprising:

(a) a modular head including a proximal end having a concavity therein for articulating with the capitellum of the humerus, and including a first lock member; and

(b) a modular body including distal end for connecting to the radius, including a second lock member for coacting with said first lock member of said modular head to lock said modular head and said modular body together, and having a drainage passage allowing fluid trapped between said first and second lock members to drain out.

2. The implant of claim 1 in which said first lock member has a cavity with a female taper;

and in which second lock member has a platform with a male taper for coacting with said female taper of said cavity of said first lock member of said modular head to lock said modular head and said modular body together.

3. The implant of claim 1 in which said modular head forms a circular disc;

in which said modular head has a distal end;

in which said modular head has an outer wall extending between said proximal and distal ends thereof; and

in which said outer wall of said modular head curves outwardly between said proximal and distal ends thereof.

4. The implant of claim 1 in which said modular head reproduces the anatomical articular geometry of the proximal end of a radius.