Body implant material

• US 3,893,196 A
• Filed: 10/11/1972
• Issued: 07/08/1975
• Est. Priority Date: 08/06/1970
• Status: Expired due to Term

• Current Assignee: Robert F. Hochman
• Original Assignee: Robert F. Hochman
• Inventors: Hochman, Robert F.
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Millin, V.
• Application Number:
  US05/296,708
• Time in Patent Office: 1,000 Days
• Field of Search: 3/1.91,1.913 128/92BA,92BC,92CA
• US Class Current: 424/422
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7283 with special cross-section of the nail
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• CPC Class Codes: A61F 2002/30009 differing in fibre orientations
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30327 differing in diameter
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/368 with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2250/0028 differing in fibre orientations
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61L 27/44 having a macromolecular matrix
• CPC Class Codes: B29L 2031/7532 Artificial members, protheses

Abstract

A material for use in fabricating a prosthesis or other body implant comprises graphite or boron fibers embedded in or coated with a medically inert plastic. The plastic binder may be a medical grade silicone polymer or the plastic may, for example, be an epoxy resin and with the epoxy resin being coated with a medically inert silicone polymer. The resultant composite has substantially better mechanical and clinical properties than conventional materials.

Claims

1. A body implant including a structure with a longitudinally layered stem portion shaped for internal body placement and comprising a composite of fibers embedded and coated with plastic, the fibers being of the group consisting of graphite fibers and boron fibers, at least the outer surface of the structure being of plastic material substantially inert to substances in the human body, and with the fibers of an inner layer of the stem portion oriented in the longitudinal direction thereof and with the fibers of an outer layer of the stem portion oriented in a circumferential direction generally at right angles to the fiber orientation in the inner layer.

2. AN ORTHOPEDIC IMPLANT COMPRISING A SHAPED COMPOSITE WITH A LONGITUDINALLY LAYERED STEM PORTION AND INCLUDING AN ORGANOPOLYSILOXANE PRESENTING AN OUTER SURFACE THAT IS INERT TO SUBSTANCES IN THE HUMAN BODY, AND FIBERS INCLUDED IN THE COMPOSITE FOR REINFORCEMENT AND WITHIN THE OUTER SURFACE AND OF THE GROUP CONSISTING OF GRAPHITE FIBERS AND BORON FIBERS, AND WITH THE FIBERS OF ONE LAYER OF THE STEM PORTION ORIENTED LONGITUDINALLY THEREOF AND WITH THE FIBERS OF AN ADJACENT LAYER ORIENTED IN A GENERALLY CIRCUMFERENTIAL DIRECTION.