SU445432A1 - Artificial Heart Valve Testing Device - Google Patents

Description

(54) DEVICE FOR TESTING ARTIFICIAL HEART VALVES

. The invention otreits to meditsiye, known device days | Spanning valves: a valve that contains a circulation Circuit with a chamber for the test valve, a pump, a flow, pressure and drain capacitance, a solenoid valve with a heart rate controller, a pneumatic system and a control valve, and a cyclical valve, and a cyclical circuit, and a cyclical valve, and a cycling valve, and a cyclical valve, and a cycling valve, and a cyclical valve, and a cycling valve, and a cyclical valve, and a cyclical valve, a circulating valve, a valve , which reduces the reliability of the results of testing, and is located so that it does not provide & ng the possibility of examining the regurgitation and tightness of welded valves,: and the pneumatic system does not have a vacuum source.

A: The purpose of the invention is to enhance; the reliability of the test results and the expansion of the valve parameters studied.

For this purpose, the outlet of the chamber for the test valve is connected directly to the inlet of the electrovalve, the outlets of which are connected to pressure and drain containers made in the form of closed hermetic vessels equipped with a switching valve.

with magstrums to connect, respectively, to the source of overpressure and vacuum

The drawing schematically shows the proposed device. . The device contains a circulation: contour with a camera. 1 for the test clap, pan 2, pump 3, consumable 4, melody 5 and drain 6 containers, solenoid valve 7: C block - transmitter 6m 8 of heart rate. The output of chamber 1 is connected directly to the input of an electric valve 7, the outputs of which are connected to capacitors 5 and 6, which are in the form of closed hermetic vessels equipped with switching lines 9 and 10 for connecting respectively to sources of excess pressure and vacuum (in the drawing not shown).

The pneumatic system includes line 9, gearbox 11, receiver 12, pressure gauge 13, valve 1 fan 14, magician) 1 stral 1O, vacuum vacuum regulator 15, receiver 16, mano-vacuum 17, valve 18, valve crane 19, connecting highways 9 and 1O.

With the help of cranes 18 and 19 connect

The 5th capacity of the main line Yu. The Eectro-valve 7, which can take two positions (in position 1 connects containers 4 and 5, in position II - capacity 4 and 6) is transferred to position 1. The liquid under the action of the differential from tank 4 , the passage valve 2 enters the tank 5. By populating it with a main line, cut off

from magastrali 9, closing 1fan 19.

i When determining the tightness of the valve | On 2, the auxiliary valve 7 is in position 1; Opening the valve 14 creates an overpressure in capacity 5. At the same time, the liquid from this tank passes through the valve already closed under the action of the backpressure. A drop in the level in the measuring tube 20 per unit of time determines the tightness of the valve.

I To determine the resistance of the valve, depending on the flow, create a certain vacuum in the tank 6 by the regulator 5 and then transfer the electro-valve 7 to the P position. The liquid from the tank 4 opens the valve 2 and enters the tank 6. As the level of liquid increases in the measuring tube 21, judging the consumption per unit of time. At the same time, a differential pressure across valve 2 is determined from dnfm 22, i.e. resistance at a given flow rate. The flow rate varies depending on the magnitude of the vacuum.

When determining the flow rate, regurgitation and resistance, under the conditions of operation of the natural heart mitral valve, valves 14 and 18 are closed, the bone 5 is inflated and vacuum is created in the tank 6: The electroklanan 7 switches the positions of the electroklan 7 with a given frequency and duration of systole. In diastole, the solenoid valve is in position P, in this case the liquid is capacious; four

J. . -

In order to simulate the atrium 4, opening and passing through valve 2, enters the tank 6, respectively. at the time of diastole ventricular function. In Tsrme.nt systole electric valve 7; Nsh4b; y1, -DODO e)

fluid: -HD: e lkstn: S.y. adhshkg yShey stomach function; 1ka V bipM Ht Sistol, under the action of excessive chavleni; closes valve 2. A drop in the level in the measuring tube 20 for a given number of cycles will be regurgitation. The level increase in the capacitance 6 is fixed on the scale of the measuring tube 21 and is the flow through the valve. At the same time, the recording equipment (not shown in the drawing) is connected to the differential pressure gauge 22 and records the change in the resistance of the valve 2 in the opening and closing cycles.

20

Subject invention

 A device for testing artificial heart valves, containing a circular, one circuit with a chamber for the person being tested: a valve, a pump, a supply, pressure and; drain tank, solenoid valve with a block i heart rate adjuster, pneumatic system; Mu and instrumentation equipment, Zo: characterized in that, in order to increase the reliability of test results and expand the test pairs of valve meters, the output of the test valve chamber is directly connected with the inlet of the solenoid valve, the outlets of which are connected to the pressure and drainage valves, made in the form. closed hermetic vessels supplied with switching lines for connecting 40 respectively to sources of overpressure and vacuum.