Depuy International Limited

David Beverland

Steven P Gowers

Robert R Freeman

Alec Paul Birkbeck

Ian Crawford Revie

Frank Foley

Mike Slomczykowski

A surgical instrument alignment guide comprising a mount () arranged to be coupled to a bone of a patient, an alignment rod (), a guide rod () and an indicator (). The alignment rod () has a first end pivotally coupled to the mount () such that the inclination of the alignment rod () relative to the mount () is adjustable. The guide rod () is couplable to a second end of the alignment rod () at an adjustable angle and orientation such that the guide rod () can extend transverse to the alignment rod (). The indicator () is coupled to the guide rod () to indicate when the guide rod () lies at a desired angle relative to a horizontal axis. Also disclosed is a method of aligning a surgical instrument using the surgical instrument alignment guide.

Alignment guide

A computer aided surgery system, method, surgical method and instrument for guiding the positioning of an acetabular cup in a pelvis are described. The position of the transverse acetabular ligament of the pelvis and the position of the acetabular labrum of the pelvis are determined. The orientation of an acetabular plane including the acetabular labrum and the transverse acetabular ligament is calculated. A planned position for the acetabular cup is determined, in which an inlet plane of the cup is substantially parallel to the acetabular plane. The instrument comprises a mounting for attaching the instrument to a patient, a support, a guide defining a longitudinal axis, and for receiving a further instrument bearing the acetabular cup implant, and an adjustment mechanism. The adjustment mechanism can allow the angular orientation of the guide to be adjusted about at least two different axes to allow the inclination and version or anteversion of the longitudinal axis to be altered.

Acetabular cup positioning

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Belfast, United Kingdom

David Beverland