1
William J Combs, Catherine R Condie, Roy Martin, Dwight H Warkentin, John D Wahlstrand, David L Thompson, Li Wang: Implantable medical device for measuring time varying physiologic conditions especially edema and for responding thereto. Medtronic, Reed Duthler, January 28, 2003: US06512949 (314 worldwide citation)

An impedance monitor for discerning edema through evaluation of respiratory rate. Preferred embodiment includes edema monitor and trigger to initiate diagnostic reporting or corrective action when activated. Recording of Long Term Average and Short Term Average values for secondary edema measure bas ...


2
John D Wahlstrand, Daniel J Baxter, R Michael Ecker, Daniel R Greeninger, Charles G Yerich: Automatic lead recognition for implantable medical device. Medtronic, Michael B Atlass, Harold R Patton, July 9, 1996: US05534018 (290 worldwide citation)

A method and apparatus for determining the availability of unipolar and/or bipolar pacing/sensing paths in a body-implantable cardiac pacing system. In one embodiment, a pacemaker system includes impedance monitoring circuitry for periodically measuring impedance between pairs of electrodes that are ...


3
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 ...


4
Carleen J Juran, James W Busacker, Michael B Shelton, Charles R Brynelsen, Thomas P Edery, John D Wahlstrand: Resetting ERI/POR/PIR/indicators in implantable medical devices. Medtronic, Michael B Atlass, Harold R Patton, November 28, 2000: US06154675 (152 worldwide citation)

An automatic, body-implantable medical device having at least two modes of operation is disclosed. The device is provided with circuitry for automatically detecting when the device has been implanted in a patient, so that the device can automatically switch from a first mode to a second mode of oper ...


5
Robert M Ecker, Lawrence C McClure, John D Wahlstrand: Verification of capture using pressure waves transmitted through a pacing lead. Medtronic, Harold R Patton, Michael B Atlass, December 30, 1997: US05702427 (145 worldwide citation)

A capture verification system for a cardiac pacemaker comprising an implantable pulse generator (IPG) and one or more pacing leads having a proximal end coupled to the IPG and a distal end in contact with a patient's heart. The capture verification system employs a pressure wave sensor mounted in th ...


6
John D Wahlstrand, Girard B Borgerding, Daniel R Greeninger, Daniel J Baxter: Method and apparatus for rate-responsive cardiac pacing. Medtronic, Dwight N Holmbo, Harold R Patton, December 21, 1993: US05271395 (142 worldwide citation)

A rate-responsive cardiac pacemaker comprising a minute ventilation circuit and an activity circuit. The minute ventilation circuit computes a first target pacing rate as a function of measurements of the patient's pleural blood impedance, and the activity circuit computes a second target pacing rat ...


7
David J Jorgenson, Ross O Starkson, Rick D McVenes, Charles D Trautmann, John D Wahlstrand, Bradley C Peck: Implantable lead functional status monitor and method. Medtronic, Girma Wolde Michael, Reed A Duthler, November 13, 2001: US06317633 (138 worldwide citation)

An implantable medical device (IMD) coupled with leads extending to body tissue providing storage of lead related data, monitoring of lead functional status, and indication of lead integrity to the clinician. A lead status monitor (LSM) processes lead related data in a system self test mode and prov ...


8
Robert M Ecker, Lawrence C McClure, John D Wahlstrand: Method and apparatus for rate-responsive cardiac pacing using header mounted pressure wave transducer. Medtronic, Michael B Atlass, Harold R Patton, March 27, 2001: US06208900 (115 worldwide citation)

In a pacemaker, a method and apparatus for providing rate response in proportion to the patient's metabolic demand for cardiac output as determined in response to the patient's breathing rate or respiratory minute ventilation or contraction strength, optionally augmented by the patient&apo ...


9
Catherine R Condie, Daniel J Baxter, William J Combs, Daniel J Greeninger, Karen J Kleckner, H Toby Markowitz, John C Stroebel, John D Wahlstrand: Method and apparatus for automatic pacing threshold determination. Medtronic, Harold R Patton, Michael B Atlass, February 3, 1998: US05713933 (112 worldwide citation)

A method and apparatus for automatic determination of a pacemaker patient's pacing stimulation threshold. Circuitry is provided in a pacemaker for obtaining a signal reflecting cardiac impedance, which is known to reliably reflect certain aspects of cardiac function. Circuitry is also provided for m ...


10
Koen J Weijand, John D Wahlstrand: Implantable medical system for performing transthoracic impedance measurements associated with cardiac function. Medtronic, Michael J Jaro, Harold Patton, October 20, 1998: US05824029 (102 worldwide citation)

A method and apparatus for deriving impedance signals with an implanted pulse generator and lead system. In particular the present invention provides a medical system which delivers electrical stimulation pulses to a first area and senses impedance in a second area, in particular the medical system ...