Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2006-06-20
2006-06-20
Pezzuto, Robert E. (Department: 3766)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S028000
Reexamination Certificate
active
07065406
ABSTRACT:
A dual chamber cardiac pacemaker has a pulse controller for delivering stimulation pulses to the ventricle of a heart, a ventricular sensor for sensing ventricular depolarization, and a unit for identifying a beginning of an A-V interval of the heart. The pulse controller causes a ventricular stimulation pulse to be generated at a predetermined energy level after the expiration of a predetermined A-V interval. The controller prolongs the A-V interval under certain circumstances. Upon the expiration of the prolonged A-V interval, the pulse controller causes the ventricular pulse generator to emit a ventricular stimulation pulse at a higher energy level than the predetermined energy level to evoke a response in the ventricle. This allows the intrinsic heart activity to be detected and utilized, while ensuring safe pacing, as well as successful and reliable stimulation and maintaining a low power consumption during normal operation.
REFERENCES:
patent: 5282838 (1994-02-01), Hauser et al.
patent: 5601615 (1997-02-01), Markowitz et al.
patent: 6618622 (2003-09-01), Mann et al.
patent: WO 97/11746 (1997-04-01), None
Mullen Kritsen
Pezzuto Robert E.
Schiff & Hardin LLP
St. Jude Medical AB
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