Boehringer Mannheim Gmbh

Depuy

John A Engelhardt

Jon C Serbousek

Richard R Tarr

David C Kelman

Jeffrey M Ondrla

Frederick A Matsen

Richard C Bolesky

Todd S Smith

Charles A Rockwood, Jr

Duane G Snyder

Charles E Whitcraft, Jr

Robert W Chandler

C Wayne Allen

Jeff M Ondrla

Alex M DiNello

Wayne Paprosky

A system is disclosed for the fixation of a component of an artificial joint for replacing a damaged natural joint. A cup-shaped socket member is formed with a plurality of radially directed through bores, each being threaded adjacent an outer hemispherical surface and each being tapered adjacent an inner hemispherical surface to define a seating surface. A fastener with an elongated shank secures the socket member to a bone and is received through each through bore. The fastener extends between a head at a first end and a tip at a second end. Mounting threads on the shank intermediate the first and second ends are threadedly engaged with the threads in the through bore and a tapered outer surface extending between the mounting threads and the second end is matingly engaged with the seating surface in the bore. The shank between the mounting threads and the tip end may be smooth, or porous coated to encourage bone ingrowth fixation, or have cancellous threads thereon for threaded engagement with the bone, or different combinations of these expedients may be used.

Enhanced fixation system for a prosthetic implant

A modular shoulder prosthesis for the replacement of a portion of the humerus is provided. The prosthesis is assembled from a kit that includes a stem sized to be received in the humerus, a body sized to replace a portion of the humerus, the body being attachable to the stem, and a head member sized to replace the head of the humerus, the head member being eccentrically attachable to the body. A collar is inserted between the head member and the body to help stabilize the assembled prosthesis.

Modular prosthesis

A modular hip prosthesis for the replacement of a portion of the femur is provided. The prosthesis is assembled from a kit that includes a stem member having an upper portion and a lower portion, with the lower portion sized to be received in the femur. The kit also includes a body member that is sized to replace a portion of the femur and is configured to be received over the upper portion of a stem member. The kit also includes a head member that is sized to replace the head of the femur. A neck member is provided to attach the head member to the body member to form an assembled prosthesis.

Modular hip prosthesis

A prosthetic acetabular cup assembly includes a single piece bearing component having an inner bearing surface for receiving a ball attached to a femoral prosthesis and an outer surface. The assembly also includes a shell component for attachment to an acetabulum to replace a natural hip socket includes an inner surface defining a cavity for receiving the bearing component therein. The inner surface of the shell component is formed to include an arcuate groove therein. A formed wire is situated in the arcuate groove of the shell component. The wire is configured so that a portion of the wire extends radially inwardly from the arcuate groove of the shell component to engage an arcuate groove formed in the bearing component to retain the bearing component inside the shell component. Anti-rotation lugs are formed on the inner surface of the shell component to cut into the outer surface of the bearing component as the bearing component is inserted into the shell component to prevent rotation of the bearing component relative to the shell component.

Acetabular cup assembly

A method and apparatus for modifying the distal end of the humerus deformed by injury or disease in preparation for fixation of an elbow joint replacement. A through hole is first formed in the superior aspect of the olecranon fossa communicating with the humeral canal. A stem member which extends from the platform of a distal cut guide tool is received through the hole and extends into the humeral canal. The distal cut guide tool is held so that the platform is generally coplanar with the junction of the medial epicondyle and the trochlea with proper inclinations, both in an anterior view and in a lateral view. Thereupon, a first resected surface is formed by sawing, using as a guide, a planar guiding surface provided on the platform. With removal of the distal cut guide tool, a broach and chamfer cut guide tool having a plurality of saw guide slots is positioned on the first resected surface and additional cuts are made with the aid of the latter tool to form a wedge of bone onto which a humeral prosthesis can be impacted.

Elbow arthroplasty instrumentation and surgical procedure

A prosthetic glenoid component is provided for attachment to a glenoid surface of a scapula to replace a natural socket of a shoulder. The glenoid component includes a molded plastic body having an outer concave bearing surface for engagement by a corresponding humeral head and an inner convex surface for abutting the glenoid surface. A plurality of attachment pegs are integrally molded on the inner surface of the glenoid component for penetrating the glenoid surface to secure the plastic body to the glenoid surface.

Glenoid component

The present invention relates to instruments for preparing a glenoid surface of a scapula to receive a prosthetic glenoid component to replace the natural socket of a shoulder. More particularly, the present invention relates to a drill guide assembly for aligning and guiding a drill bit to form holes in the glenoid surface at predetermined locations to secure the glenoid component to the glenoid surface. A reamer assembly including a ratchet drive mechanism is also included to facilitate preparation of the glenoid surface prior to installation of the glenoid component.

Glenoid component installation tools

A surgical retractor is disclosed for use when surgery is performed adjacent a bone and remains in place for an appropriate duration without requiring manual assistance. A barrier member includes a plurality of cannulated fixation posts for its temporary placement on, and attached to, the bone and a soft tissue engaging surface which extends transverse of a surface of the bone. Guides, including the cannulated fixation posts, slidably receive mounting pins which supplement the fixation posts for temporarily attaching the barrier member to the bone. The barrier member is also provided with bottom and top flanges which extend transversely of the soft tissue engaging surface and cooperate therewith to prevent entry of the soft tissue into an adjacent surgical site.

Surgical retractor

An improved acetabular cup for use in cement fixation has at least one flat area on its generally hemispherical outer surface. The flat area resists rotation of the cup in the cement mantle after implantation while avoiding concentrations of stress in the mantle.

Acetabular cup

A transmission for converting rotary motion to simultaneous reciprocating motion of a tool in two mutually transverse directions. A driver is selectively attached to one end of an input shaft and the opposite end of the input shaft terminates at an eccentric cam. An output shaft extends between a driven end and a working end. The driven end is apertured to rotatably receive the eccentric cam and the output shaft is slidably received in the diametrically extending bore of a spherical bearing member. Upon rotation of the input shaft, the working end of the output shaft is caused to reciprocate toward and away from the input shaft and, simultaneously, laterally relative to a longitudinal axis of the input shaft. The working end of the output shaft may be provided with appropriate cutting teeth to enable its use, for example, as a power broach for the precise removal of bone to enable proper implantation of a prosthetic device. In another embodiment, the working end may be movable in three mutually transverse directions.

Power broach system

A dynamic bone fixation screw for rejoining fracture fragments of a bone to their approximate original mutual dispositions. It includes a threaded distal end member for threaded engagement with one of the bone fragments and a head member at a proximal end for engagement with another of the bone fragments. A spring member integral with and extending between the distal end member and the head member enables a predetermined torque to be initially imparted to the bone. When stress relaxation in the bone occurs, the spring member relaxes accordingly while continuing to draw the bone fragments together. The bone screw is fabricated in a unique manner.

Dynamic tension bone screw

A dynamic bone fixation screw for rejoining fracture fragments of a bone to their approximate original mutual dispostion. It includes a threaded distal end member for threaded engagment with one of the bone fragments and a head member at a proximal end for engagement with another of the bone fragments. A spring member integral with and extending between the distal end member and the head member enables a predetermined torque to be initially imparted to the bone. When stress relaxation in the bone occurs, the spring member relaxes accordingly while continuing to draw the bone fragments together. The bone screw is fabricated in a unique manner.

Method of making a dynamic tension bone screw

A fixation system for drawing together into engaging relationship mutually opposed fracture surfaces of a pair of bone fragments at a fracture site. An elongated blade with a sharpened leading end is driven into a first bone fragment generally parallel to and spaced from a fracture surface of the first bone fragment. A flange member integral with the blade extends transverse of the blade and overlies the fracture site between the first and second bone fragments. At least one screw fastener with a head and threaded shank extends through an opening in the flange and is threaded into the second bone fragment along an axis which extends away from the blade. With continued tightening of the screw fastener, the head engages the flange and draws the flange against both bone fragments, holds the blade in a deepest seated relationship with the first bone fragment, and imparts a compressive or wedging force to the first and second bone fragments forcing them together at the site of fracture and enabling healing to proceed.

Bone fixation system

A structural joint which may be for orthopedic use is effective to simultaneously resist bending and torsional loading. It includes a female member formed with a cone shaped bore and a mouth defining entry into the bore. A male member matingly engageable with the female member has a contoured outer surface which includes a coupling element sized and shaped for mating engagement with the bore. When the male and female members are joined, the coupling element extends to a location within the bore spaced from the mouth and joins, via a smooth surfaced intermediate element, to a transitional element whose transverse dimension is substantially smaller than the mouth of the bore as it extends through and beyond the mouth. The bore and the coupling element may be mutually tapered such that the male and female members become locked together when engaged.

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Warsaw, IN, United States of America

John A Engelhardt