SU405551A1 - VPTBFOND ENOE - Google Patents

Description

This invention relates to the field of medicine.

A device is known for the transducer, the sh1, the shelter, and the air pulse generator, the blood pump, and the cardiac output sensor with a pneumatic output. The disadvantage of such a device is the impossibility of an automatic transition from the synchronous synchronization mode with the emergency, and the patient's contractions to the blood circulation with a given duration of systole, and diastole (at the time of termination of heart activity). environmental pressure conditions, for example, in pressure chambers, where job safety is a particular requirement.

For to improve the perfusion safety, the proposed device is equipped with a mode selection unit, connected with & an input with a pneumatic generator and a heart activity sensor, and an output with a pump FOR BLOOD.

In addition, the operating mode selection block may contain two pneumatic relays. Controller / e, pa of the first relay is connected to one of the generator outputs via one | input of the "OR" element, and KaiMepa power supply of the second relay is connected to the generator's other output, with THIS the output of the second relay is connected

with the atmosphere, the input of the first relay is connected to a blood pump, and the input of the second relay and the output of the heart activity sensor through the second input of the OR element are connected to the control (camera of the first relay.

FIG. 1 shows a basic 1a diagram of a device for pumping blood; in fig. 2 - the circuit diagram of the pneumatic relay operating is presented.

without connecting the feed chamber to the atmosphere at the time of actuation.

The device contains a pneumatic generator 1, a unit 2 for selecting the operating mode, a hem of 3 for blood, and a sensor for combining heart rate.

Lneumatic relays 5, and 6 of the generator operate without connecting the power supply chamber to the atmosphere at the time of actuation. The alternating inductors 7 and S and the non-return valve 9 are connected as follows: the power chamber of the relay. 10 is connected to the pneumatic line via the A / V valve, the chamber of the relay 12 is connected to the generator /; one of the inputs of the element

The OR 13 is connected to the generator 1, and the other is connected to the control chamber of the relay 12 and the heart activity sensor; The output of the OR element is connected to the control chamber of the relay 10, the output of which is connected to the pneumatic chamber of the blood pump 3.

Drive operation in the first mode. When supplying the device with pressure pressure P w - 1.4 kg / cm. The pneumatic generator starts to operate in a cyclic mode, and Pa is one of the outputs connected to the element “OR 13 of block 2, the unit zero signal appears alternately which are through the element “OR include the relay 10 of unit 2 and the absence of power; the output of the last wa is intermittent gas flow, driven into the actual pump. The duration of the pause between the gas flows at the output of the relay 10, consequently, and the duration of the diastole of the blood pump is determined by the filling time of the control chamber of the generator relay 6 to the maximum pressure, the actual upper limit of operation and the relay 6 through the variable throttle 7, .and is governed by the magnitude of the crush of this throttle. The duration of the systole of the pump 5 is determined by the emptying time of the gas accumulated in the control chamber of relay 6 to a pressure value equal to the lower threshold of this relay through the check valve 9 and the variable throttle 8, p. Is regulated by the throttle 8. Gas flow at the relay output unit 2 and, therefore, l proizvoditelnosti pump 3 is regulated by valve 1J.

The presence of the generator / pneumatic relays 5 and 6 in the circuit, there is no "short circuit" effect (connection of the feed chamber with the atmosphere) at the time of the relay (see Fig. 2), and the check valve 9 connecting them , allows independent adjustment of the duration of the table and diastole and significantly improves the stability and accuracy of pump: pump 5, since; in this case, no sweat occurs; when the pressure is triggered, the indicated relays and regardless of the characteristics of the selected relays and pressure of the circulating medium (The time of the unmanaged "relay 6, determining the duration of diastole, depends only on the closure value of throttles. 7, and the time of its emptying, determining the duration of systole, depends only on the closure value of the sprouts. .

The operation of the actuator in the second mode is carried out, in the case when the transmitter of heart activity associated with the patient receives pneumatic impulses in unit 2.

In block 2, the pneumatic signal from the heart activity sensor 4 goes to the second input of the pneumo-element OR 13 .and. Into the control chamber of relay 12. Each time the pneumatic signal from the sensor 4 appears, it turns on The associated power supply chamber with the liner, and the filling and emptying of the corresponding chamber of the generator 6 relay /, connects this liner to its operation with the atmosphere, without allowing pressure to accumulate in the control chamber. The relay 6, thereby turning off generator 1 of .action. At the same time, a single signal from the sensor 4 through the element "OR 13, V | Switches the relay 10,

at the output of which a gas flow appears, which is driven by an operating pump 3, while the duration of the flow of gas entering the pneumatic chamber of pump 3 is equal to the pulse duration from the sensor of the ser.dat,

i.e. patient systole heart.

Thus, the synchronization of the pump 3 with the patient's heart activity occurs. The ejected volume of blood is thus regulated, as in the first case, by a valve.

Upon termination of the patient's cardiac activity, when the pneumatic signal from the sensor 4 does not enter the control chamber of relay 12, the latter is turned off and separates the filling chamber of the pneumatic chambers (temporary) with the atmosphere. In this case, the drive begins to work in the first mode, i.e., proizvodo. DIT pumping blood with a given duration of systole and diastole.

Thus, the presence of the drive unit 2 allows the selection of the mode of operation of the pump 3 and the automatic transfer from one mode to another, depending on the occurrence or termination of the patient's cardiac activity.

Performing the drive on pneumatic relays that operate without the KOipoTKoro closure makes the drive work without pressure from the ambient pressure, ensures safety and reliability under conditions of high vibration, shock and temperature fluctuations.

Subject invention

Claims (2)

1. A device for pumping blood, containing a pneumatic pulse generator named after it, a blood pump and a heart activity sensor with a pneumatic output, is distinguished by the fact that, in order to improve the perfusion safety, it is equipped with a unit of choice. its own air inlet with a pneumatic generator and an LM sensor for the activity of the ser.dts, and the output with a pump for ° mole: 2. The device according to claim 1, characterized in that the operating mode selection unit contains two pneumatic relays, the controller of the first relay is connected from the generator outputs via one input of the OR element, and the second relay power chamber is connected to Another is provided by the generator output, while the output of the second relay is connected to the atmosphere, the input of the first relay is connected to the blood pump, and the input of the second relay and the output of the heart activity sensor through the second BHOD E element OR is connected to the control chamber of the first relay. Rpit Pynfl. Output  Rzapr.