1
Harold T Markowitz: Marker channel telemetry system for a medical device. Medtronic, Robert C Beck, John L Rooney, Joseph F Breimayer, February 15, 1983: US04374382 (341 worldwide citation)

A marker channel telemetry system for use with a pacemaker or other medical device for transmitting event identifying codes to a remote receiver to indicate the occurrence of specific events such as sensed and paced events in a dual chamber pacemaker. The structure of the system includes latches to ...


2
Harold T Markowitz, Ann L Ledin: Method and apparatus for implementing histogram storage and trend analysis in a medical stimulator. Medtronic, February 18, 1992: US05088488 (86 worldwide citation)

An implantable medical device employing a random access memory for storage of data relating the physiologic condition of the patient in which the device is implanted and/or information related to the functioning of the device. The memory and associated addressing circuitry are reconfigurable to allo ...


3
Harold T Markowitz, John C Rueter, Edwin G Duffin: Device for detecting retrograde conduction. Medtronic, Glenn W Bowen, John L Rooney, Joseph F Breimayer, March 19, 1985: US04505276 (25 worldwide citation)

A pacing system analyzer is constructed to provide verification that an implantable cardiac pacer operating in a demand mode will not itself produce tachycardia in a patient because of abnormally long patient retrograde conduction time. The analyzer when performing the retrograde conduction test pro ...


4
Harold T Markowitz, John C Rueter, Gary J Syring: Device for determining the pacing modality of an artificial cardiac pacemaker. Medtronic, Glenn W Bowen, John L Rooney, Joseph F Breimayer, March 12, 1985: US04503858 (10 worldwide citation)

A pacing system analyzer as connected to an implantable cardiac pacer and if an atrial pacing pulse is detected only, the analyzer sends a simulated P-wave to the pacer and determines the response of the simulated P-wave to determine if the pacing mode is AAI, AAT, or AOO. In the event a ventricular ...