Radial head implant system including modular implant and modular radial head locking instrument

• US 6,361,563 B2
• Filed: 05/15/2001
• Issued: 03/26/2002
• 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: King, Graham J. W., Patterson, Stuart D., Grusin, Nathaniel Kelley, Theis-Handwerker, Maureen, Johnson, James A., Terrill-Grisoni, Lauralan
• Primary Examiner(s): Smith, Jeffrey A.
• Application Number:
  US09/854,958
• Publication Number:
  US 20010021876A1
• Time in Patent Office: 315 Days
• Field of Search: 623/11.11, 623/16.11, 623/18.11, 623/20.11, 623/20.12, 623/20.13, 623/23.42, 623/23.43, 623/911, 623/909, 606/53, 606/86, 606/205, 606/1, 861/26
• 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 modular radial head system including a modular implant for replacing the head of the proximal end of a radius and for articulating with the capitellum of a humerus. The modular implant includes a modular head and an modular stem. The system further includes a modular radial head locking instrument for locking the modular head and the modular stem of the modular implant to one another. The locking instrument includes a first jaw, a second jaw, and a control mechanism for urging the first and second jaws together to provide offset axial compression of the modular head and the modular stem of the modular implant.

Claims

1. A modular radial head system comprising:

(a) 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 including a modular head having a first lock member, and including a modular stem having a second lock member for coacting with said first lock member of said modular head to lock said modular head and said modular stem together; and

(b) a modular radial head locking instrument for locking said modular head and said modular stem of said modular implant to one another;

said modular radial head locking instrument including a first jaw, a second jaw, and a control mechanism for urging said first and second jaws together;

said first jaw having a distal end adapted to engage a portion of said modular stem and having a proximal end;

said second jaw having a distal end adapted to engage a portion of said modular head and having a proximal end;

said control mechanism engaging said proximal ends of said first and second jaws to provide offset axial compression of said modular head and said modular stem.

2. The system of claim 1 in which said distal end of said first jaw of said modular radial head locking instrument has a slot for receiving a portion of said modular stem;

and in which said distal end of said second jaw of said modular radial head locking instrument has a centering means for receiving and positioning said modular head.

3. The system of claim 1 in which said offset axial compression provided by said control mechanism is load controlled.