摘要:
Disclosed is a polymeric orthopaedic bearing material for use as an implant material or part thereof comprising one or more crosslinked regions and one or more non-crosslinked or substantially non-crosslinked regions at the surface. The bearing material can be prepared from a crosslinkable polymer, e.g., ultrahigh molecular weight polyethylene. The orthopaedic bearing material has an advantageous combination of at least one wear property and at least one mechanical property. Also disclosed are processes for producing orthopaedic bearing materials, for example, by irradiating a raw material in consolidated form through a radiation mask having a perforated pattern for crosslinking selected regions of the raw material, and optionally shaping the raw material into a bearing material. Alternatively, a pulsed radiation beam can be used for crosslinking.
摘要:
The invention provides a medical implant or medical implant part comprising a body and a surface layer, wherein the surface layer comprises a mixture comprising at least one hydrophilic polymer and ultrahigh molecular weight polyethylene having a weight average molecular weight of about 400,000 atomic mass units or more. The invention also provides a method for producing such a medical implant or medical implant.
摘要:
The invention provides a medical implant or medical implant part comprising porous ultrahigh molecular weight polyethylene having a weight average molecular weight of about 400,000 atomic mass units or more and a porosity of about 15% to about 65%. The invention further provides a process for producing a medical implant or medical implant part.
摘要:
Optical clarity is improved in blends of two transparent immiscible polymers by addition of a third polymer which is selectively miscible with one of the two original immiscible polymers. The ratio of amounts of the third polymer and the one original polymer with which it is miscible is adjusted to achieve a resultant refractive index close to the refractive index of the other of the two original immiscible polymers. Alternatively, if particular amounts of the third polymer and the original polymer with which it is miscible are desired, then the other of the two immiscible polymers is chosen to be one having a refractive index close to the resultant refractive index of the two miscible polymers. One particular blend system in which optical clarity is improved by use of the methods of this invention is a blend comprising: (a) a resinous monovinyl aromatic-conjugated diene copolymer; (b) a styrene-maleic anhydride copolymer; and (c) poly(alpha-methylstyrene).
摘要:
An orthopaedic bearing includes a metallic component having a polymer composite secured thereto. A method of making an orthopaedic bearing is also disclosed.
摘要:
The invention provides a medical implant or medical implant part comprising porous ultrahigh molecular weight polyethylene having a weight average molecular weight of about 400,000 atomic mass units or more and a porosity of about 15% to about 65%. The invention further provides a process for producing a medical implant or medical implant part.
摘要:
The invention provides a polymer composition comprising cross-linked polyethylene having a non-polar biocompatible lipid disposed in at least a portion of the free volume of the polyethylene. The invention further provides methods for making the polymer composition.
摘要:
A prosthetic implant includes first, second and third components. The first component is configured to be disposed within the acetabulum. The second component is in a load bearing relationship with the first component, and is operable to rotate in a first axis of rotation. The second component is inhibited from movement in a second axis of rotation. The third component is in a load bearing relationship with the second component. The third component is operable to rotate in the second axis of rotation, but is inhibited from movement with the first axis of rotation.