METHOD AND DEVICE FOR DETECTING CARDIO CYCLE START IN REAL TIME MODE Russian patent published in 2007 - IPC A61B5/452 

FIELD: medicine; medical engineering.

SUBSTANCE: method involves filtering cardiosignal, digitizing it in time, forming threshold levels and comparing each digitized reading to the threshold levels. The number of readings taken in turn between the threshold levels is counted. The counting result reaching value of n, reference point of n-th discrete electric cardiosignal reading of the cardiocycle next in turn is taken for start point on time axis. Discrete readings coming out of the threshold levels earlier than given number of n is reached in counting, the counting restarts from zero. To determine count number of n, two additional threshold levels are formed. One of them is set above zero line at half T-tooth amplitude value and the other one at the same value below the zero line. Each discrete electric cardiosignal reading value is compared to given threshold levels and the number of readings selected in turn between the levels is counted. Maximum value of this kind Nm is determined in each cardiocycle. The value of n is set equal to 1/2 Nm. Device has filter, analog commutator, clock pulse oscillator, four comparators, four threshold level sources, four AND-gate circuits, two pulse counters, digital comparator, unit for setting maximum value and multiplier.

EFFECT: high reliability in determining cardiocycle start in arrhythmia and QRS-complex shape variation cases.

2 cl, 4 dwg