EP0218471A1
Expired / Lapsed
EP
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Bone cement
Assignee: Lucite International Speciality Polymers and Resines Ltd
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Filing: 1986-10-01
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Granted: —
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Expires: 2006-10-01
Abstract
Abstract A composition for forming a bone cement or the like, comprising a powder component and a monomer component, the powder component comprising ethylmethacrylate polymer beads incorporating particles of opacifier therein and the monomer component comprising n-butyl methacrylate.
Inventors
- 👤 Laurence Gordon Wood
- 👤 Michael Braden
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:39
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/0047; A61L24/0073; A61L24/0089; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2002/4631; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A composition for use in making a bone cement or the like, the composition comprising a powder polymer component and a monomer component therefor, the components being sterile for medical use, an opacifier being incorporated within the polymer of the powder component characterised in that the polymer is ethylmethacrylate polymer and the monomer comprises n-butyl methacrylate.
Claim 2
Dependent Claim
56 words
A composition for use in making a bone cement or the like, the composition comprising a powder polymer component and a monomer component therefor, the components being sterile for medical use, an opacifier being incorporated within the polymer of the powder component characterised in that the polymer is ethylmethacrylate polymer and the monomer comprises n-butyl methacrylate.
Claim 3
Dependent Claim
41 words
A composition according to Claim 1 characterised in that the ethylmethacrylate polymer has an average molecular weight range from about 150, 000 to about 1, 500, 000 and a particle size distribution in the range of about 15 to 100 micron.
Claim 4
Dependent Claim
34 words
A composition according to Claim 1 or 2 characterised in that the monomer component comprises the liquid monomer and an activating tertiary amine selected so that polymerisation takes place at or below body temperature.
Claim 5
Dependent Claim
22 words
A composition according to any preceding Claim characterised in that polymer is sterilised by gamma irradiation and the monomer by bacteriological filtration.
Claim 6
Dependent Claim
37 words
A composition according to any preceding Claim characterised in that the opacifier is barium sulphate, zinc oxide or zirconium dioxide in a proportion of from about 5 to 50% by weight of the polymer of the powder.
Claim 7
Dependent Claim
17 words
A composition according to any preceding Claim characterised in that the monomer component includes a cross-linking agent.
Claim 8
Dependent Claim
48 words
A method of making the powder component of the composition of Claim 1 characterised by dispersing particles of the opacifier within a prepolymer by ball, high speed or similar milling, diluting the dispersion with monomer and carrying out suspension polymerisation to form polymer beads containing particles of opacifier.
Claim 9
Dependent Claim
24 words
A method according to Claim 7 characterised in that the polymer beads are made including a peroxide as catalyst and a chain transfer agent.
Claim 10
Dependent Claim
81 words
A powder polymer component for use in making bone cement or the like comprising a polyacrylate beads, characterised in that the acrylate is a sterilised poly (ethylmethacrylate) having a molecular weight in the range of about 150, 000 to 1, 500, 000, the polymer being in the form of beads having a particle size distribution in the range of about 15 to 100 micron, particles of the opacifier having been incorporated within the beads by ball, high speed or like milling.
Claim 11
Dependent Claim
81 words
A powder polymer component for use in making bone cement or the like comprising a polyacrylate beads, characterised in that the acrylate is a sterilised poly (ethylmethacrylate) having a molecular weight in the range of about 150, 000 to 1, 500, 000, the polymer being in the form of beads having a particle size distribution in the range of about 15 to 100 micron, particles of the opacifier having been incorporated within the beads by ball, high speed or like milling.
Claim 12
Dependent Claim
34 words
A monomer component for use in making a bone cement or the like characterised in that the monomer comprises n-butyl methacrylate monomer in liquid form and a tertiary amine activator,optionally with a cross-linking agent.
Claim 13
Dependent Claim
34 words
A monomer component for use in making a bone cement or the like characterised in that the monomer comprises n-butyl methacrylate monomer in liquid form and a tertiary amine activator,optionally with a cross-linking agent.
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