Modular bone implant, tool, and method
AssigneeZimmer Technology, Inc.
InventorsDaniel F. Justin, E. Marlowe Goble, Thomas Wade Fallin, Nathan A. Hammond, Daniel J. Triplett, Robert A. Hodorek, Daniel Gerbec, Gordon Baker
Life of this patent
Estimating the term…
Abstract
Modular bone implants, means of assembly, and their method of use are presented.
Claims55
A tibial component of a knee prosthesis comprising a tray having substantially planar top and bottom surfaces and an extension forming an elongate body having a top end and a bottom end, one of the tray and extension including an outwardly projecting boss, the boss having an outer wall including a cylindrical portion and a tapered portion, the other of the tray and extension including an inwardly extending bore forming a bore wall, the bore wall including a cylindrical portion and a tapered portion, the extension being removably engagable with the tray with the boss received in the bore, the tapered portion of the boss seating on the tapered portion of the bore and the cylindrical portion of the boss being received by the cylindrical portion of the bore in press-fit relationship to form a junction between the tray and extension.
A bone joint implant comprising:
- a first component having top and bottom surfaces;
- and
- a second component having a top end and a bottom end and an axis from the top end to the bottom end, the second component being removably affixed to the bottom of the first component, one of the fist and second components including a male junction element having an outer wall including a first seating portion having a first shape and a second seating portion having a second shape, the other of the first and second components including a female junction having an inner wall including a first seating portion having a first shape congruent with the male first seating portion shape and a second seating portion having a second shape congruent with the male second seating portion shape, the first and second seating portion shapes being incongruent, the second component being releasably joined with the first component with the male first and second seating portions being in close fitting relationship with the female first and second seating portions.
A tibial component of a knee prosthesis comprising:
- a tray having top and bottom surfaces and an axis extending between them, at least one fin extending radially outwardly along the bottom surface and projecting axially downwardly;
- and
- a keel having a top end and a bottom end and an axis from the top end to the bottom end generally parallel to the tray axis, the keel forming an outer surface and being removably affixed to the bottom of the tray, the keel further comprising at least one fin extending axially along the outer surface and projecting radially outwardly, the tray and keel fins being generally axially aligned with one another from top to bottom to project as a single fin but being in axial spaced relationship so that they do not contact.
A tibial component of a knee prosthesis comprising:
- a tray having top and bottom surfaces;
- and
- a keel having a top end and a bottom end and an axis from the top end to the bottom end, the keel being engagable with the bottom of the tray, the keel and tray forming a junction including a rotational alignment means for aligning the keel and tray in a predetermined relationship for assembly, the alignment means being sealed within the junction to prevent migration of material from the rotational alignment means outside of the junction.
A tool for assembling first and second modular joint components, the tool comprising first and second tool elements connectable to the first and second joint components respectively, the tool containing stored energy able to bias the first and second tool elements relative to one another upon activation of the tool to draw the first and second modular joint components into seating relationship.
The tool of claim 31 wherein tool energy is released quickly to rapidly snap the components together in press-fit relationship.
A tool for assembling first and second modular joint components, the tool comprising:
- a handle;
- a first shaft member mounted on the handle for axial translation and being engagable with the first joint component in axial force transmitting relationship;
- a second shaft member fixed to the handle and being engagable with the second joint component in axial force transmitting relationship;
- a motor engaging the first member to impart axial force to the first member to move the joint components into engagement, the tool storing energy to drive the motor.
A method for assembling a modular joint component, the method comprising the steps of:
- providing first and second modular joint components having corresponding first and second engagement portions;
- providing a tool having first and second tool elements, the tool containing stored energy able to bias the first and second tool elements relative to one another;
- aligning the first and second engagement portions;
- engaging the tool first and second tool elements with the first and second joint components, activating the tool to release the stored energy to bias the first and second tool elements and draw the first and second joint components together.
A method for implanting a modular tibial component into a knee, the method comprising the steps of:
- providing separate, modular tibial tray and keel components;
- forming an incision in the knee joint;
- preparing the tibial bone to receive the components;
- inserting the keel component through the incision and seating it in the prepared tibial bone;
- inserting the tray component through the incision and assembling it to the keel component in situ;
- and
- closing the incision.
Dependencies are inferred from the claim text.