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Biomedical subjects

N A Super

Publications and source records attributed to N A Super.

8 recordsLinked to original sources
PubMedDate not supplied

[Methods and modern apparatus for assisted circulation. The basic trends in their development].

A systematization of methods for assisted circulation, based on the formulation of a concrete procedure, the nature of the deranged or lost function substitution and conditions for effective realization of such a substitution, is offered. This made it possible to classify the equipment for assisted circulation and to analyze the current trends of its further development. The most characteristic automation levels of the equipment under consideration and of generations of some apparatus, differing in the degree of automation, control and monitoring the process of assisted circulation, are presented in the form of tables and pictures.

Assisted Circulation↗
PubMedDate not supplied

[Methods of cardiac synchronization in assisted circulation].

In assisted circulation cardiosynchronization should be regarded as a process of monitoring the arterial blood pressure within the limits of the cardiac cycle and changes of its form with the aim of improving the energy balance of the heart. The coordination of the pumping function and that of the cardio-vascular system comes to a problem of shaping the monitoring action that depends upon three variables, viz. the time lag tepsilon, actuation of the unit relative to the base cardiosignal, duration of the pumping phase tpi and the signal level at the pump's inlet U(t). A number of researchers consider tepsilon and tpi to be a function of the cardiac contractions period and determine them in different ways, employing for this purpose extrapolation, stochastic characteristics, etc. Of late, in addition to the period of cardiac contractions extremal, mean integral values of the systolic and diastolic pressure, the level of pressure at the instant of the cardiac valves closure and others have also come in use. There are shortcomings in the proposed cardiosynchronization algorhythms: their empiric nature and also the fact that the monitoring action includes merely variables tepsilon and tpi and does not carry function U(t), which reflects the intensity of the pump's operation.

Assisted Circulation↗
PubMedDate not supplied

[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.

Animals↗
PubMedDate not supplied

[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.

Assisted Circulation↗
PubMedDate not supplied

[Means of improving the operational safety of balloon-pump counter-pulsation apparatus].

The apparatus of assisted circulation, in particular those intended for counter-pulsation with the pump-balloon, as concerns their reliability and safety to units whose failure presents immediate danger for the patient's life. An analysis of modern batch manufactured apparatus revealed a tendency toward widening the scope and complicating the signallization means of automatic protection and preventing failures. It is shown that the reliability of the units for counter-pulsation with the pump-balloon is not only a technical, but also a biomedicocybernetic problem. Substance is given to the need for introduction into the system of the apparatus for assisted circulation of sand-by actuating mechanisms for secure a purposeful influence on the physiological parameters of the organism.

Assisted Circulation↗