SU640742A1 - Auxiliary blood circulation apparatus drive - Google Patents

Description

one

The invention relates to medical instrumentation and can be applied in artificial and auxiliary blood circulation devices.

Drives for auxiliary blood circulation apparatus are known, which contain a drive mechanism made in the form of an electric motor and equipped with a mechanical pneumo-transducer lj.

Another actuator for the auxiliary blood circulation apparatus is also known, consisting of a linear reciprocating electric motor, on the shaft of which a membrane pump 2 is fixed.

This device is the closest to the invention by technical

essence and the achieved result.

The disadvantage of it is low speed and low efficiency, which in many cases does not allow to carry out the Auxiliary blood circulation process correctly.

The aim of the invention is to eliminate these drawbacks by introducing additional structural elements.

This goal is achieved — that the drive mechanism further comprises a control motor and an impeller, and the mechanical pneumatic converter includes bellows and a hollow cylinder.

The drawing shows a kinematic drive diagram for ancillary circulation apparatus.

It has a drive mechanism 1 consisting of control 2 to power 3 engines. On the shaft of the latter, there is an impeller 4 with blades 5 located inside the hollow cylinder 6, one of the ends of which with the help of the bellows 7 is closed by a diaphragm 8, which is the piston of the output pump 9, which is also bellows 1O. The entire drive is placed inside a closed volume 11, limited by the casing 12 from the external environment. The load is connected to the connector 13.

The drive works as follows.

Claims (2)

The power motor 3 rotates the impeller 4 evenly, and the control motor 2 sets the angle of installation of the blades 5 of the wing 36 .4 readings 4. When the mounting angle is positive, the pressure 5 creates an overpressure in the chamber of the syphon 7, and a negative pressure creates a negative pressure. Moreover, on the other side of the diaphragm 8, a pressure is created that is antiphase pressure in the chamber of the bellows 7, Controlled according to a given law, the angle of installation of the blades 5 with the help of the control motor 2 and the required pressure change in the chamber of the bellows 7, The ratio of the cross sections of the bellows 7 and Yu sets the gain of the pneumatic amplifier and is determined by the characteristics of the load on which the drive operates. Using a high-speed electric motor (above 12,000 rpm) reduces the weight of the power motor and increases the speed of the system, since an increase in the number of revolutions leads to a decrease in the amplitude of the blade oscillations set by the control motor. In addition, the inertial mass of the drive under consideration is determined only by the parameters of structural materials that can be selected based on the technological capabilities of producing Miniature parts, since the control motor does not participate in the power conversion of energy if the aerodynamic axis of the spikes coincides with their axis of rotation. The possibility of decreasing the inertial mass and amplitude of oscillation of the blades allows significantly increasing the speed of the system. The use of a fast-moving, equilibrium rotating power engine allows reducing the weight of the drive as a whole and increasing its efficiency (there are no losses to overcome the inertia of the power engine) 2 Except In addition, the ability to work in a closed space also increases the efficiency of the drive, since the thermodynamic cycle becomes closed. Thus, the application of the invention will increase the speed by no less than an order of magnitude, reduce the weight by not less than 1%, increase the efficiency by not less than 50% compared with the known drives for medical devices that perform pumping functions. DETAILED DESCRIPTION OF THE INVENTION A drive for ancillary circulatory apparatus, comprising a drive mechanism, including a power motor, and a mechanopneumatic transducer, characterized in that, in order to ensure the adequacy of the circulation, by increasing efficiency and increasing the drive speed, the drive mechanism additionally contains a control motor and a flap. The mechanical transducer includes bellows and a hollow cylinder, the impeller being located on the shaft of the power motor and defining a hollow cylinder, one of the ends of which has a moving diaphragm, and the axes of the blades of the impeller are connected by means of a reducer to the shaft of the control motor. Sources of information taken into account in the examination: 1. US Patent No. 3842440, CL 3-1, 1974. 2. Belilovsky M. A,. Apparatus for supporting blood circulation Biopulse 2.- Medical equipment, 1971, No. 4, p. 14-18.