Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2006-11-15
2009-10-13
Layno, Carl H (Department: 3766)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S009000, C607S015000, C607S017000, C607S025000
Reexamination Certificate
active
07603172
ABSTRACT:
Heart stimulator that provides for timing a premature stimulation pulse for anti-tachycardia pacing outside the vulnerable phase of a ventricle, to terminate stable ventricular tachycardia while minimizing the risk of accelerating stable ventricular tachycardia into unstable ventricular tachycardia or ventricular fibrillation. RT interval is determined instead of QT interval. Conventional QT interval is defined to end at T wave offset, which is difficult to measure because inherent imprecision in identifying the end of T wave from surface ECG. For safe ATP, such problems may be avoided. Because the VP usually refers to the portion of the T wave near the peak and early downslope (FIG.3), in order to avoid the VP, only need to determine the peak of T wave, then set an blanking window or safety margin (e.g., 20 ms before to 20 ms after the peak of T wave) during which ATP pulses should not be delivered.
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European Search Report dated Jan. 15, 2008.
Lang Volker
Lian Jie
Muessig Dirk
Bays Pamela M
Biotronik CRM Patent AG
Dalina Law Group P.C.
Layno Carl H
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