Patent ID: 7331965

Claim:
Measuring instrument, preferably for use in connection with hip prosthesis surgery, characterised in that the measuring instrument includes: an adapter including a measuring head and a connector, where the measuring head is provided with a largely hemispherical surface in which there is a central through-going bore, where the measuring head is divided into at least two separate sections, where the connector is hollow and slotted at one end in axial direction of the measuring head into a number of legs, the number of legs corresponding to the number of the at least two separate sections of the measuring head, where the legs of the connector are each connected to one of the at least two sections of the measuring head on the rear side of the hemisphere, where a securing arrangement is provided at the opposite end of the connector relative to the connection to the measuring head; a measuring unit including a actuating rod, where a main part has a conical shape that can interact displaceably axially with the central bore of the adapter and thereby change the diameter of the measuring head of the adapter, a mounting ring where means for engaging the securing arrangement of the adapter are provided, where the mounting ring is connected with a handle member, where in connection with the handle member there is provided means for axial displacement of the actuation rod and registration of the relative displacement of the actuation rod relative to the measuring head; a depth gauge including a first part, which is preferably a smooth rod, and a second part with stop and measurement indications, where the depth gauge is provided for interacting with a through-going opening in the axial direction of the measuring instrument.