Back to results
US 4,919,666 AGranted
Implant having recesses for therapeutically effective substances
AssigneeSulzer Brothers Limited
InventorsUrsula Buchhorn, Hans B. Willert
Life of this patent
Estimating the term…
Abstract
The implant is provided with recesses in which therapeutically effective substances are embedded. Each recess is closed by a porous cover which is of a porosity to permit permeation of the therapeutic substance out of the recess while preventing ingrowth of bone tissue. Each cover may be slightly deformed into a convex shape to project from a recess to achieve elastic bonding with a bone.
Claims14
A bone implant for insertion into a bone cavity comprising
- a body configured for implanting into a bone cavity and having at least one recess in a surface thereof, said recess being sized to receive a therapeutically effective substance for subsequent release into surrounding tissue in said cavity;
- and
- a separate porous cover separately secured in said body from the therapeutically effective substance to close over said recess, said cover having a porosity sufficient to be permeable to the substance received in said recess and to fluids having the substance dissolved therein while being impermeable to the ingrowth of bone tissue.
A prosthesis comprising
- a body having an anchoring shaft configured for implanting into a bone cavity with at least one recess in a surface thereof, said recess being sized to receive a therapeutically effective substance for subsequent release into surrounding tissue;
- and
- a porous cover separately secured in said body to close over said recess from the therapeutically effective substance, said cover having a porosity sufficient to be permeable to the substance received in said recess and to fluids having the substance dissolved therein while being impermeable to the ingrowth of bone tissue.
An acetabular prosthesis comprising
- an acetabular body having a cavity for receiving a joint head, a circumferential base about said cavity, an outer hemispherical surface, at least one pocket in said surface for receiving a therapeutic effective substance;
- a hemispherical bowl mounted over said surface and having at least one opening aligned with and communicating with said pocket;
- and
- a porous cover in said opening of said bowl to close said pocket, said cover having a porosity sufficient to be permeable to the substance received in said pocket while being impermeable to an ingrowth of tissue.
1 more element
An implant comprising
- an implantable body having at least one recess in a surface thereof, said recess being sized to receive a therapeutically effective substance for subsequent release into surrounding tissue;
- and
- a porous cover made of elastic material which is prestressed to clamp said cover in said recess of said body to close over said recess, said cover having a porosity sufficient to be permeable to the substance received in said recess and to fluids having the substance dissolved therein while being impermeable to the ingrowth of tissue.
A prosthesis comprising
- a body having an anchoring shaft with a plurality of recesses in a surface thereof, each said recess being sized to receive a therapeutically effective substance for subsequent release into surrounding tissue;
- and
- a plurality of porous covers, each said porous cover being separately secured in said body to close over a respective recess from the therapeutically effective substance, each said cover having a porosity sufficient to be permeable to the substance received in a respective recess and to fluids having the substance dissolved therein while being impermeable to the ingrowth of tissue and being made of elastic material which is prestressed to clamp said cover in a respective recess.
A prosthesis comprising
- a body having an anchoring shaft with at least one recess in a surface thereof and a groove coaxial about said recess and having a conical wall, said recess being sized to receive a therapeutically effective substance for subsequent release into surrounding tissue;
- and
- a porous cover separately secured in said groove of said body to close over said recess from the therapeutically effective substance, said cover having a conical periphery mating with said conical wall and a porosity sufficient to be permeable to the substance received in said recess and to fluids having the substance dissolved therein while being impermeable to the ingrowth of tissue.
Dependencies are inferred from the claim text.