ADJUSTABLE-ANGLE RADIUS PLATE

• US 20110218534A1
• Filed: 11/18/2010
• Published: 09/08/2011
• Est. Priority Date: 03/08/2010
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Memometal Technologies SA (Stryker Corporation)
• Inventors: PRANDI, Bernard, Chick, Grégoire, Cognet, Jean Michel, Papaloïzos, Michaël, Tchurukdichian, Alain, Martinache, Xavier
• Granted Patent: US 8,579,898 B2
• Time in Patent Office: Days
• US Class Current: 606/71
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61B 17/8061 specially adapted for particular bones A61B17/70 and A61B17/74 take precedence

Abstract

A bone plate for a fracture between an epiphysis and a diaphysis has an outer part unitarily formed with a fan-shaped outer end having a plurality of outer holes and an inner end extending from the outer end. A bar-shaped inner part has an outer end juxtaposed with the inner end of the outer part and formed inward of its outer end with a plurality of inner holes. A pivot is provided between the inner end of the outer part and the outer end of the inner part. Formations juxtaposed with the pivot on the inner end of the outer part and on the outer end of the inner part are lockable together in each of a plurality of angularly offset fixed positions of the inner and outer parts. When the formations are pressed together the inner and outer parts are locked angularly relative to each other.

Claims

1. A bone plate for reducing a fracture between an epiphysis and a diaphysis of a bone, the plate comprising:

an outer part unitarily formed with a fan-shaped outer end formed with a plurality of outer holes and an inner end extending along a longitudinal axis from the outer end, the outer part being adapted to be screwed through the outer holes to the epiphysis;

a bar-shaped inner part having an outer end juxtaposed with the inner end of the outer part and formed inward of its to outer end with a plurality of inner holes, the inner part being adapted to be screwed through the inner holes to the diaphysis;

a pivot between the inner end of the outer part and the outer end of the inner part and defining a pivot axis;

formations juxtaposed with the pivot on the inner end of the outer part and on the outer end of the inner part and lockable together in each of a plurality of angularly offset fixed positions of the inner and outer parts; and

means for pressing the formations together and thereby locking the inner and outer parts angularly relative to each other in each of the positions.

2. The bone plate defined in claim 1 wherein the formations on the inner end of the outer part are an array of teeth extending radially of the pivot axis and projecting axially of the pivot toward the outer end of the inner part, the formations on the outer end of the inner part being a complementary array of teeth axially meshable with the teeth of the outer part.

3. The bone plate defined in claim 1 wherein the means for pressing includes a screw having a shaft threaded axially into the inner end of the outer part and a head bearing axially on the outer end of the inner part.

4. The bone plate defined in claim 1 wherein both the outer end of the inner part and the inner end of the outer part overlap and are each of generally half a thickness of the inner part measured parallel to the axis.

5. The bone plate defined in claim 1 wherein the inner end of the outer part is formed with a throughgoing slot extending generally parallel to the diaphysis, the plate further comprising an anchor screw extending through the slot and seated in the diaphysis.

6. The bone plate defined in claim 1 wherein the outer part is formed between its inner and outer ends with a window through which a fracture between the diaphysis and epiphysis is viewable.

7. The bone plate defined in claim 1 wherein the inner end of the outer part has an extension projecting under the outer end of the inner part and formed with a screw seat, the outer end of the inner part being formed over the screw seat with a transverse throughgoing slot, the bone plate further comprising a screw having a shaft seated in the screw seat and a head bearing on the outer end of the inner part.

8. The bone plate defined in claim 1, further comprising abutments on the inner and outer parts limiting pivoting of the inner part to an angle of about 30°

about the axis relative to the outer part.