1
Joel E Sivula, Robert A Betzold: Method and apparatus for implementing activity sensing in a pulse generator. Medtronic, October 1, 1991: US05052388 (267 worldwide citation)

A cardiac pacemaker system of the type including a sensor responsive to the metabolic demand for oxygen and which varies the pacing rate in response to the output of the sensor. The pacemaker defines a function relating sensor output to pacing rate, based upon independently selectable parameters, in ...


2
David A Igel, H Toby Markowitz, Robert A Betzold, Karen J Kleckner, Jeremy A Schroetter: Regularization of ventricular rate during atrial tachyarrhythmia. Medtronic, Girma Wolde Michael, August 13, 2002: US06434424 (98 worldwide citation)

A pacing system provided with a mode switching feature and ventricular rate regularization (VRR) function adapted to stabilize or regularize ventricular heart rate during chronic or paroxysmal atrial tachyarrhythmia. In a preferred embodiment, the pacing system nominally operates in an atrial synchr ...


3
H Toby Markowitz, John C Stroebel, Robert A Betzold: Dual chamber pacemaker with safe airial pacing. Medtronic, Reed A Duthler, Harold R Patton, December 28, 1993: US05273035 (89 worldwide citation)

A dual chamber pacemaker is provided, preferably either DDDR or DDIR, having logic hardware and/or software for normally carrying out the DDIR or DDDR mode of operation, and further having means for carrying out a safe atrial pace method of operation in circumstances where normal atrial pacing could ...


4
Karen J Kleckner, Carleen J Juran, Robert A Betzold, Thomas C Wendell, Charles G Yerich: Multi-site cardiac pacing system having conditional refractory period. Medtronic, Girma Wolde Michael, December 17, 2002: US06496730 (85 worldwide citation)

Multi-site cardiac pacing systems for providing pacing to multiple sites in a patient's heart, e.g., in a single heart chamber or in right and left heart chambers, while avoiding inappropriate responses to double sensing of an evoked depolarization conducted between the sites. A conditional ref ...


5
Robert A Betzold: Dual-chamber pacemaker with automatic selection of atrial refractory period. Medtronic, Reed A Duthler, Harold R Patton, June 23, 1992: US05123412 (32 worldwide citation)

An improved atrial synchronous dual-chamber pacemaker provided with a variable refractory period during which the pacemaker is not responsive to sensed atrial contractions. The atrial refractory period is selected based upon whether the ventricular pacing pulse preceding the refractory occurred as a ...


6
James H Ericksen, Robert A Betzold, Catherine R Condie, Jeffrey M Gillberg, Robert W Stadler, John C Stroebel, Troy E Jackson: Pacemaker having adaptive arrhythmia detection windows. Medtronic, Girma Wolde Michael, Michael C Soldner, May 4, 2004: US06731983 (32 worldwide citation)

A device-implemented software system operates a detection window and adjusts PAV as needed after confirming the presence or detection of evidence of an arrhythmia. The detection window is monitored based on a preferred length. If the detection window is shorter than required, intervals are adjusted ...


7
Robert A Betzold, David E Dalluge: Atrial tachyarrhythmia detection in implantable pulse generators. Medtronic, Michael B Atlass, Harold R Patton, August 19, 1997: US05658320 (31 worldwide citation)

Because a determination of atrial tachycardia can occur too often where the pacemaker maintained true atrial interval value is designed to converge on the shortest A-A intervals, a method and apparatus either extends PVAB to cover inappropriate atrial senses that should not be counted in determining ...


8
Robert A Betzold, David A Casavant, Paul A Belk, Thomas J Mullen, John C Stroebel, Steven R Hornberger, Todd J Sheldon, Douglas A Peterson: Ventricular event filtering for an implantable medical device. Medtronic, Daniel G Chapik, Girma Wolde Michael, July 17, 2007: US07245966 (29 worldwide citation)

Pacing parameters are provided to address cross talk and intrinsic ventricular events occurring within a predefined blanking period following an atrial event. The parameters are used in conjunction with protocol for minimizing or reducing ventricular pacing, wherein ignoring intrinsic ventricular ev ...


9
Robert A Betzold, James W Busacker: Replacement indicator timer for implantable medical devices. Medtronic, Girma Wolde Michael, Paul H McDowall, October 17, 2006: US07123964 (26 worldwide citation)

A system and method is provided for reliably indicating that an implantable medical device is in need of replacement. The system and method measures the operational characteristics of the battery and the operational parameters of the implantable device itself. When these characteristics and paramete ...


10
Robert A Betzold, Eduardo N Warman: Dual-chamber pacemaker with optimized PVARP following event that may disrupt AV synchrony. Medtronic, Reed A Duthler, Girma Wolde Michael, October 30, 2001: US06311088 (25 worldwide citation)

A pacemaker and a method of employing a pacemaker to pace a patient's heart. The method of operation of the pacemaker includes defining a post ventricular atrial refractory period having a first duration responsive to ventricular events, during which period the pacemaker does not initiate timin ...