Reinforced bone cement

• US 5,049,157 A
• Filed: 08/12/1987
• Issued: 09/17/1991
• Est. Priority Date: 06/29/1978
• Status: Expired due to Fees

• Current Assignee: Osteo AG
• Original Assignee: Osteo AG
• Inventors: Moser, Heinz, Leu, Beat, Mittelmeier, Heinz
• Primary Examiner(s): Hastings, Karen M.
• Application Number:
  US07/084,168
• Time in Patent Office: 1,497 Days
• Field of Search: 623/16, 623/18-23, 523/105, 524/533, 128/92 R, 128/92 VP, 606/86
• US Class Current: 623/23.62
• CPC Class Codes: A61B 17/8802 Equipment for handling bone cement or other fluid fillers
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30907 Nets or sleeves applied to surface of prostheses or in cement
• 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 2002/30919 Sleeves
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2310/00952 Coating, pre-coating or prosthesis-covering structure made of bone cement, e.g. pre-applied PMMA cement mantle
• CPC Class Codes: A61L 24/0084 containing fillers of phosphorus-containing inorganic compounds, e.g. apatite
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/46 with phosphorus-containing inorganic fillers
• CPC Class Codes: C08L 33/12 Homopolymers or copolymers of methyl methacrylate

Abstract

A bone cement exhibiting superior mechanical strength and body compatibility, as well as shortened polymerization time and reduced peak polymerization temperature, includes a conventional polymethyl methacrylate bone cement to which has been added up to about 4% by weight of carbon fibers and from about 1 to about 30% by weight of the mineral components of natural bone tissue (apatite).

Claims

1. A bone cement for adhering a prosthetic device to a bone consisting essentially of polymethyl methacrylate or its derivatives, carbon fibers and an essentially non-absorbably mineral component in fine grained particle form, said essentially non-absorbably mineral component comprising apatite in an amount of between 1 and 30l% by weight.

2. A bone cement according to claim 1, wherein said apatite is present in an amount between about 15 and 25l% by weight.

3. A bone cement according to claim 1, wherein said carbon fibers are structured, said structure being provided by a linking method such as weaving, knitting or cross-linking by adhesion.

4. A bone cement according to claim 3, wherein said structured fibers are provided in the form of a tube, stocking or sock, the fibers being expediently distributed in the cement.

5. A bone cement according to claim 1, wherein said apatite is a mixture of synthetically produced apatite and apatite obtained from natural bone.

6. A bone cement according to claim 1, additionally containing an X-ray additive such as a barium salt.

7. A bone cement according to claim 1, additionally containing a mixture of essentially non-absorbably calcium phosphates.