Hemodialysis is a complex process requiring the increased control of some parameters, such as dialysis dose, blood perfusion rate, ultrafiltration, blood volume, its composition and etc. To solve the problem of control the blood during dialysis was designed the monitoring system of air inclusions - air bubbles. A very important part of this system is the ultrasonic air detector. It is set to venous blood highway - at the exit of blood from the dialyzer, and determines the presence in the cleaned blood any air inclusions by measuring the velocity of ultrasound in the analyzed multiphase medium - the blood, thus informing the doctor about the quality and security of hemodialysis procedure.

Keywords: Air embolism, bubble trap, air detector, speed of ultrasonic vibrations, the pulse-frequency method of measurement the ultrasonic speed.

The system that provides suppression external to the object magnetic disturbances during magnetoencephalography was developed. Register magnetic fields of the brain can detect features of the functioning of the CNS and to determine normal or pathological activity in human regulation systems, reflecting the functional state of human health. The designed system consists of a device for registration of external magnetic fields - fluxgate magnetometer, compensation module external magnetic field - coils Helmholtz, device register magnetic fields of the brain and compensate for a homogeneously magnetic field generated by the device of compensation of external magnetic fields.

Keywords: Magnetoencephalography, fluxgate magnetometer, coils Helmholtz, induction magnetometer