ELECTRICAL CHARGE COMPENSATION SYSTEM, ITS APPLICATION AND METHOD FOR INTRAOPERATIVE ELECTRICAL STIMULATION AND MEASUREMENT OF RESULTING ELECTRICAL RESPONSES Russian patent published in 2023 - IPC A61B5/24 A61N1/36 

FIELD: medicine.
SUBSTANCE: system for electrical charge compensation after generating impulses of a stimulating current and its application, a method for intraoperative electrical stimulation and measurement of the resulting electrical reactions in a load resistance in form of a tissue, organ or part of the patient's body. The system contains circuit elements, a bridge branch between two arms of the bridge circuit, and a current source. The bridge branch between the two arms of the circuit includes a load resistance in form of a tissue, organ or part of the patient's body. The current source is connected to the arms of the bridge circuit in such a way that, with the appropriate position of the switch, it allows the flow of electric current through the bridge branch along one arm and, further, through the other arm connected to the other end of the bridge branch, and is designed to generate a stimulation current pulse. The bridge branch contains a capacitive element for generating a current intended for electrical compensation of the charge caused by the impulses of the supplied stimulation current. The system is designed in such a way that a delay period is maintained between the stimulation current pulses and the discharge of the capacitive element through the stimulation electrode in order to electrically compensate the charge through the stimulation electrode. The period is used to measure the electrical physiological signals from the load resistance evoked in response to a stimulation current pulse. The system is designed in such a way that the measurement of physiological signals stimulated from the load resistance due to the action of the stimulation current pulse is carried out by means of the signal pickup electrode during the delay period at the time point corresponding to the absence of the stimulation current and the compensation current through the load resistance. Said pickup electrode is positioned at a location different from the point of electrical stimulation of the two arms. When executing the method of intraoperative electrical stimulation and measuring the resulting electrical reactions in the load resistance, an electrical charge compensation system is used to generate a stimulation current pulse and the resulting charge compensation current accumulated in a capacitive element connected in series with the load resistance. During the lag period characterized by the absence of stimulation current and charge compensation current, the electrical response of the load resistance is picked up and measured. The system is used to generate stimulation currents that affect the load resistance in form of a tissue, organ or part of the patient's body. In this case, the currents cause electrical physiological reactions in the load resistor, which can be picked up and measured.

EFFECT: the system and the method enable electrical stimulation during surgery or for diagnosing patients, and, in order to reduce or eliminate electrolytic effects, generate currents opposite to the stimulation current applied as a stimulation pulse and measure the physiological electrical signals caused by the stimulation current.

15 cl, 7 dwg