1
Steven J Urquhart, Richard S Schallhorn: Method and apparatus for performing stereotactic surgery. Medtronic Navigation, Harness Dickey & Pierce, December 25, 2007: US07313430 (252 worldwide citation)

A stereotactic navigation system for navigating an instrument to a target within a patient may include a stereotactic head frame, an imaging device, a tracking device, a controller and a display. The stereotactic head frame is coupled to the patient and is used to assist in guiding the instrument to ...


2
Charles G Yerich, William J Combs, Karen J Kleckner, Eric J Panken, Richard S Schallhorn, John D Wahlstrand: Method and apparatus for rate-responsive cardiac pacing. Medtronic, Michael B Atlass, Harold R Patton, October 8, 1996: US05562711 (159 worldwide citation)

A body-implantable rate-responsive cardiac pacemaker is provided with circuitry for sensing a plurality of physiologic parameters known to be indicative of a patient's metabolic demand for increased cardiac output. In one embodiment, a rate-responsive pacemaker is provided with an activity sensor fo ...


3
Steven J Urquhart, Richard S Schallhorn: Method and apparatus for performing stereotactic surgery. Harness Dickey & Pierce, March 3, 2005: US20050049486-A1

A stereotactic navigation system for navigating an instrument to a target within a patient may include a stereotactic head frame, an imaging device, a tracking device, a controller and a display. The stereotactic head frame is coupled to the patient and is used to assist in guiding the instrument to ...


4
Steven J Urquhart, Richard S Schallhorn: Method and apparatus for performing stereotactic surgery. Surgical Navigation Technologies, Harness Dickey & Pierce, April 24, 2008: US20080097195-A1

A stereotactic navigation system for navigating an instrument to a target within a patient may include a stereotactic head frame, an imaging device, a tracking device, a controller and a display. The stereotactic head frame is coupled to the patient and is used to assist in guiding the instrument to ...