1
Terrence R Hudrlik: Multiple frequency impedance measurement system. Medtronic, Reed A Duthler, Harold R Patton, February 1, 1994: US05282840 (268 worldwide citation)

A physiological monitoring system for monitoring the condition of a patient's body tissue. The device includes electrodes for contacting the tissue to be monitored, circuitry for generating electrical signals at at least two frequencies for application to the tissue and circuitry for monitoring the ...


2
Terrence R Hudrlik: Medical stimulator with multiple operational amplifier output stimulation circuits. Medtronic, Reed A Duthler, Harold R Patton, December 6, 1994: US05370665 (186 worldwide citation)

A cardiac pacemaker or other tissue stimulator including first and second stimulation electrodes mounted adjacent to one another and adjacent the tissue to be stimulated, such as a chamber of a heart, a return electrode and a pulse generator which independently generates two or more stimulation puls ...


3
Terrence R Hudrlik: Cardiac pacemaker with operational amplifier output circuit. Medtronic, Reed A Duthler, Harold R Patton, August 10, 1993: US05233985 (149 worldwide citation)

A medical electrical stimulator employing an operational amplifier output circuit for producing an electrical stimulating pulse for application to body tissue and for sensing electrical activity in the body tissue. A first input to the operational amplifier is coupled through a virtual load to a pro ...


4
Terrence R Hudrlik: Sensor for detecting cardiac depolarizations particularly adapted for use in a cardiac pacemaker. Medtronic, Reed A Duthler, Harold R Patton, October 20, 1992: US05156149 (136 worldwide citation)

A pacemaker sense amplifier which includes active circuitry which establishes and maintains a constant field density between two electrode poles, effectively clamping them together at a substantially fixed potential difference. The amount of current or power required to maintain this condition in th ...


5
Rick D Mc Venes, Brent A Bahr, Terrence R Hudrlik: Implantable medical device system with method for determining lead condition. Medtronic, Michael J Jaro, Harold Patton, April 21, 1998: US05741311 (104 worldwide citation)

In an implantable medical device system such as a pacemaker system, there is provided a system and method for measuring lead impedance so as to obtain reliable data concerning any indication of the need to replace the lead. A relatively short duration low current AC burst is delivered after a standa ...


6
Russell E Anderson, James D Reinke, Kirk S Vadnais, Terrence R Hudrlik: Ring-to-ring cardiac electrogram pacemaker. Medtronic, Harold R Patton, Gregory P Gadson, November 30, 1993: US05265602 (64 worldwide citation)

A pacemaker having two bipolar leads, one atrial, one ventricular, each with TIP and RING electrodes, configured as for conventional bipolar pacing/sensing in both chambers. Switching circuitry in the pacemaker is operable to select from among various possible sensing configurations, including one c ...


7
Terrence R Hudrlik: Waveform discriminator for cardiac stimulation devices. Medtronic, Reed A Duthler, Harold Patton, May 2, 1995: US05411529 (61 worldwide citation)

An apparatus for producing signals indicative of power levels of depolarizations of heart tissue, particularly adapted for use in an implantable antiarrhythmia device or an implantable pacemaker. The device distinguishes between the power level of sensed depolarization signals in order to distinguis ...


8
Terrence R Hudrlik: Electronic capture detection for a pacer. Medtronic, Reed A Duthler, Harold R Patton, November 30, 1993: US05265603 (55 worldwide citation)

A pacemaker sense amplifier which includes active circuitry which establishes and attempts to maintain a constant field density between two electrodes, effectively clamping them together at substantially fixed relative electrical potentials. The amount of current or power provided to the electrodes ...


9
Terrence R Hudrlik: Myocardial conduction velocity rate responsive pacemaker. Medtronic, Reed A Duthler, Harold R Patton, September 14, 1993: US05243981 (27 worldwide citation)

A system for detecting changes in the myocardial conduction velocity and deriving control signals therefrom for controlling the delivery of electrical or other therapy to the heart or for monitoring or diagnostic purposes. The system comprises two spaced electrodes coupled to amplifiers which detect ...


10
Thomas C Wright, Terrence R Hudrlik, Perry A Mills, Robert C Rust, Thomas G Wallner: Atrial rate sensitive cardiac pacer circuit. Cardiac Pacemakers, Orrin M Haugen, Thomas J Nikolai, November 3, 1981: US04298007 (18 worldwide citation)

An electrical pacer device which responds to cardiac demand so as to alter the cardiac output in a fashion to satisfy that demand. Changes in the fundamental period of the atrial electrical cycle are detected and averaged over a predetermined time interval and the resulting control signal is used to ...