FLOW SENSOR AND FLOW RATE MEASUREMENT METHOD Russian patent published in 2022 - IPC A61B5/26 G01F1/688 G01F15/02 

FIELD: medicine.

SUBSTANCE: group of inventions relates to a sensor for measuring blood flow, a method for measuring blood flow rate, an intravascular catheter, an intravascular catheter guide. Sensor for measuring blood flow comprises an assembly of an electroactive material device, a drive, a controller. Drive is designed to control the layout of the electroactive material device for local heat supply to the fluid medium, the flow of which is subject to measurement. Controller is configured to read measuring signals from the arrangement of the electroactive material device, using measurement signals to obtain a flow measurement result. Measurement signals from the arrangement of the electroactive material device relate to the temperature at the device with the electroactive material. When implementing the method, the arrangement of the electroactive material device is controlled for local heat supply to the fluid medium, the flow rate of which is to be measured. Measurement signals are read from the assembly of the electroactive material device. Measurement signals relate to temperature at the device of electroactive material. Measurement signals are used to determine the flow measurement result. When reading measurement signals using the controller, the sensor readings are provided to perform measurements of the electrical characteristic. Temperature is determined from measurements on sensor of electroactive material. Electrical characteristic comprises the impedance or phase angle of the device of the electroactive material at a first frequency and at a second frequency different from the first frequency. Intravascular catheter comprises a sensor for measuring blood flow. Intravascular catheter guide comprises a sensor for measuring blood flow.

EFFECT: provided is a sensor and a method for measuring blood flow rate based on measuring a decrease in temperature, by measuring the electrical characteristic comprising the impedance or phase angle of the impedance of the electroactive material device, the mutual effects of temperature and pressure can be eliminated, so that temperature can be measured at any pressure.

16 cl, 27 dwg