Patent RU-2070060-C1 (RU)
Title: Method of control of muscular blood pump and muscular blood pump electrostimulator
Inventor: DUBROVSKIJ IGOR A
IPC: A61M1/36
Filed: 1992-06-11
Granted: 1996-12-10
Abstract: FIELD: medicine, in particular, method and devices of auxiliary blood circulation. SUBSTANCE: the method consists in delivery of a burst of stimulating pulses to an automuscular graft in the cardiosynchronized conditions with the synchronization rate programmed from without and controlled, depending on the heart rate, total duration of action on the automuscle; in the first variant of the design the rheomyosignal of the automuscle is registered in succession,, the duration of this signal is measured and compared with the prescribed standard; should the measured duration exceed the prescribed standard, the total duration of action on the automuscle is decreased, and should the standard exceed the measured duration of the automuscle rheomyosignal, the total duration of action o the automuscle is increased; in the second variant of the design the automuscle rheomyosignal is registered in succession, the maximum of this signal is discriminated, the relationship between the value of the automuscle theonyosignal in the selected point of the cardiocycle and the maximum of the automuscle rheomyosignal is calculated, and the obtained relationship is compared with the prescribed threshold; if the obtained relationship exceeds the prescribed threshold, the total duration of action on the automuscle is decreased, and if the threshold exceeds the calculated relationship, the total duration of action on the automuscle is increased. The device uses interconnected cardial canal, muscular canal and control unit of total duration of action on the automuscle; the input of the cardial canal is connected to the heart, the output of the muscular canal is connected to the automuscular graft; the muscular canal is made in the form of series-connected programmed divider of cardiocycles, stimulating pulse generator and output stage; the control unit output; the control unit output is connected to the control input of the stimulating pulse generator, in the first variant of the design it uses series - connected rheomyosignal generating unit is connected to the automuscle graft, the output of the rheomyosignal generating unit is connected to the input of the control unit of the total length of action on the automuscle, whose synchronizing input is connected to the output of the programmed divider of cardiocycles, and the inhibitory input of the rheomyosignal generating unit is connected to the output of the stimulating pulse generator; in the second variant of the design it uses series-connected rheomyosignal generating unit, rheomyosignal maximum discrimination unit and unit calculating the relationship of rheomyosignal values; the input of the rheomyosignal generating unit is connected to the muscular graft, the output of the rheomyosignal generating unit is additionally connected to the second input of the unit calculating the relationship of rheomyosignal values, whose synchronizing input is connected to the output of the programmed divider of cardiocycles; the reset input of the rheomyosignal maximum discrimination unit is connected to the output of the cardial canal, and the inhibitory input of the rheomyosignal generating unit is connected to the output of the stimulating pulse generator. EFFECT: facilitated procedure. 35 cl, 9 dwg