Synthes Usa, LLC

Depuy Synthes Products, Inc.

Andre Frenk

Franco Cicoira

Florian Beutter

Walter Pistoia

Yan Yevmenenko

Christof Dutoit

Philippe Chelius

A bone screw is provided having first and second threaded portions of different diameter separated by a middle portion that is unthreaded so that the bone screw may be inserted into a pair of adjacent bone fragments and used to compress the fragments together by driving the screw into a hole drilled in the fragments. An installation tool is also disclosed for threadably engaging one end of the bone screw and is used to initially drive the screw into the bone hole. Thereafter, a screwdriver may be inserted through the tool and into engagement with a recess in the bone screw and may be used to drive the screw fully into the bone and to separate the bone screw from the installation tool. A method of installation is further provided.

Headless compression screw with integrated reduction-compression instrument

A method is for implanting Bone Screw: screwing into a threaded bore in a distal portion of Implantation Instrument a rear threaded portion of Screw having a front threaded portion separated from the rear portion by an unthreaded middle portion, Screw including a central bore hole therethrough dimensioned to accommodate a guide wire; inserting the wire into a first target portion of bone; inserting Instrument over the wire such that the front threaded portion is adjacent to the first target portion; rotating Instrument to insert the front threaded portion into the first target portion while a locking component is engaged to prevent rotation of Screw relative to Instrument; and rotating Screw with the tool to drive Screw further into the first target portion to a desired depth and out of engagement with Instrument while the component is disengaged to permit rotation of Screw relative to Instrument.

A device for manipulating bone fragments includes a bone screw includes a shaft extending along a longitudinal axis. The shaft includes a first end having a first threaded portion with a first core diameter, a first external diameter and a first pitch. The shaft includes a second end having a second threaded portion with a second core diameter, a second external diameter and a second pitch. The second end further has a tool engaging surface, wherein the first external diameter is no greater than the second core diameter, the first and second pitches are substantially equal, and a non-threaded middle segment between the first and second threaded portions, an outer diameter of the middle segment being smaller than the first core diameter, and wherein the shaft includes a cannulation extending therethrough disposed coaxial with the screw longitudinal axis. An installation instrument includes first and second ends, a longitudinal axis, and a bore extending along at least a portion of the longitudinal axis, the bore in communication with the first end of the instrument, wherein the bore has threads along at least a portion of a length thereof, the threads configured to mate with the second threaded portion of the bone screw so that rotating the installation instrument rotates the bone screw to drive the screw into a bone.

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Brittnau, Switzerland

Andre Frenk