Implant with resorbable stem
OwnerStanley L. Kampnerinventor
Life of this patent
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Abstract
This invention relates to a biodegradable anchor for a permanent implant of a bone joint, e.g. hip, shoulder, knee or finger. The biodegradable anchor is an elongated member which has an exterior surface which tightly engages a cavity in the bone and is substantially immovable within the cavity upon implant. A non-resorbable means of securing the anchor to the permanent implant is also included.
Claims34
An anchor for a permanent implant for a bone joint comprising an elongated member for insertion into a bone cavity for fixing the implant relative to the bone, the member being constructed substantially entirely of a biodegradable material so that the member can resorb after a period of time, the member having an exterior surface shaped to tightly engage the cavity and to be substantially immovably disposed within the cavity after being placed therein, and means for securing the member to the permanent implant.
An anchor according to claim 15 wherein the permanent bone implant is selected from an alloy of cobalt-chromium or titanium.
An anchor according to claim 15 wherein the implant is part of a prosthetic hip.
An anchor according to claim 15 wherein the implant is part of a prosthetic knee.
An anchor according to claim 15 wherein the implant is part of a prosthetic shoulder.
A procedure for the implantation of a prosthetic implant comprising the steps of:
- a. providing a functional implant component adapted to remain in permanent contact with the bone;
- b. forming a portion of the component in contact with the bone so that bony ingrowth can attach directly thereto;
- c. opening a cavity in the bone;
- d. placing the functional component against the bone;
- e. inserting an anchor substantially completely constructed of a resorbable material into the cavity so that the anchor is substantially immovably disposed within the cavity;
- f. fixedly securing the component to the anchor so that the component is in contact with bone surrounding the cavity;
- g. growing bone proximate the cavity into the portion of the component to thereby permanently fix the component to the bone;
- and
- h. substantially completely resorbing the anchor after the completion of the promoting step so that natural tissue can grow back into the cavity.
A prosthetic implant for a bone joint comprising a component defining an operative portion of the joint, the component having an interface facing generally away from the joint and adapted to be placed into intimate contact with a natural bone to which the component is to be fixed, at least part of the interface including means promoting bony ingrowth when the interface is in intimate contact with the natural bone;
- an anchor connected to the component adapted to be inserted in a cavity in the bone for orienting and immovably fixing the component to the bone immediately upon implantation, the anchor being constructed of a biodegradable material so that it resorbs after a period of time and thereby vacates the cavity to permit natural bone to grow back into the cavity.
A procedure for replacing a diseased natural joint component on a bone with a prosthetic joint component comprising the steps of:
- removing the diseased joint component and forming a load transference surface on the bone relatively proximate the diseased joint, providing the prosthetic joint component with an interface adapted to be placed into intimate contact with the load transference surface on the bone and forming at least a portion of the interface to promote bony ingrowth;
- bringing the interface of the prosthetic join component into intimate contact with the load transference surface on the bone, forming a cavity in the bone which communicates with the prosthetic component when the latter is in contact with the load transference surface, substantially immovably positioning an anchor in the cavity, substantially immovably attaching the prosthetic joint component to the anchor to retain the interface in contact with the load transference surface and to thereby promote bony ingrowth in to the portion of the interface while enabling use of the joint, and permitting the anchor to resorb after bony ingrowth into the portion of the prosthetic component interface has immovably fixed the prosthetic component directly to the bone;
- whereby load transference from the component to the bone takes place in the vicinity of the joint and is prevented from taking place in the cavity at locations relatively remote from the joint.
A prosthetic implant for a bone joint comprising a component defining an operative portion of the joint, the component having a interface facing generally away from the joint and adapted to be placed into intimate contact with a natural bone to which the component is to be fixed, a part of the interface being adapted to directly connect to the natural bone when it is brought into intimate with the natural bone;
- an anchor connected to the component adapted to be inserted in a cavity in the bone for orienting and immovably fixing the component to the bone immediately upon implantation, the anchor being constructed substantially entirely of a biodegradable material so that it resorbs after a period of time and thereby vacates the cavity to permit natural bone to grow back into the cavity.
Procedure for replacing a diseased, natural joint component of a bone with a prosthetic joint component comprising the steps of:
- removing the diseased joint component and forming a load transference surface on the bone relatively proximate the diseased join;
- providing a prosthetic joint component with an interface adapted to be placed into intimate contact with the load transference surface on the bone;
- adapting at least a portion of the interface so that it establishes a direct connection between such portion and the natural bone when it is brought into intimate contact with the natural bone;
- bringing the interface of the prosthetic joint component into intimate with the load transference surface on the bone;
- forming a cavity in the bone which communicates with the prosthetic component when the latter is in contact with the load transference surface;
- substantially immovably positioning an anchor in the cavity;
- substantially immovably attaching the prosthetic joint component to the anchor to retain the interface in contact with the load transference surface and to thereby promote the establishment of a direct connection between the portion of the interface and the load transference surface while enabling use of the joint;
- and permitting the anchor to resorb after the direct connection between the portion of the prosthetic component interface and the load transference surface has immovably fixed the prosthetic component directly to the bone;
- whereby load transference from the component to the bone takes place in the vicinity of the joint and is prevented from taking place in the cavity at locations relatively remote from the joint.
Dependencies are inferred from the claim text.