[Study of the pneumotachograph with the Pito tube].

The pneumotachograph with a velocity head flowmeter and a linearization system has been studied. Theoretical and experimental results have revealed a possibility to design a multilevel pneumotachograph with the Pito tube providing gas output measurements at a wide respiration range while the slight flow resistance and the small dead space being maintained. It also allows for undisturbed data recording.

[Dual control of organ-assisting devices according to the criterion of the activity of the partially replaced organ].

The authors propose a structure of controlled accessory systems that are intended to substitute the functions of different human organs. It is shown, that during controlled process it is possible to extract the value indicating the variability of the substituted organ activity and to use it as the control criterion.

[Gas volume stabilization in the pneumatic transmission unit of the assisted circulation apparatus].

A compensator connected to the section consisting of the pump-main line-operating member and including a pneumatic resistance and a flaxid non-elastic container enables it in combination with the feedback to maintain through the volumetric displacement of the gas, or changing the pump diaphragm position, the stability of the gas volume in the pneumatic transmission element of the assisted circulation apparatus. The stabilization of the gas volume in the pneumatic transmission element creates favourable conditions of exploitation and heightens the effect of the cardiac insufficiency treatment, expecially in cases of protracted assisted circulation.

[Test of the "Biopulse-3" aortic balloon pumping apparatus].

Experiments on a specially constructed laboratory stand were set up with a view to determining power and dynamic possibilities of the translatory motion drive in the "Biopulse-3" unit when operating an intra-aortic ball-pump and also assessing the service properties of individual unit-blocks intended for injection, measurement and registration. Trial testing showed the drive to the suitable for using in the intra-aortic ballooning.