Breathing gas flow generator

FIELD: electricity.

SUBSTANCE: breathing gas flow generator comprises an electric drive with electronic control unit and breathing bag with inlet and outlet return valves. Weight is attached hermetically to the upper edge of the breathing bag. The lower edge of the breathing bag is attached to the generator housing. By flexible coupling the weight is connected to the electric drive shaft. Flexible coupling is made so that it may be wound to the electric drive shaft several times. The electric drive control unit is designed to ensure reversive rotation of the electric drive shaft at controlled angular speed in both directions.

EFFECT: invention allows simplifying design of the breathing gas flow generator, increasing its reliability.

1 dwg

 

The present invention relates to medical equipment and can be used to create artificial lung ventilation (ALV) and anesthetic and respiratory equipment (NDA).

Known ventilators and NDA containing as the generator of the flow of breathing gas corrugated fur with inlet and outlet check valves, and a mechanism for converting rotational motion of the drive shaft into reciprocating motion of breathing fur, through which is formed a flow of breathing gas. The mechanisms providing reciprocating motion furs (furs), NDA and the ventilators were used for different tasks.

So in the ventilator "Phase-1", manufactured by Voronezh mechanical plant (Voronezh), was used "swing bearing" (the so-called "drunken bearing") - see http:/ru.m.wikipedia.org/wiki.

The disadvantage of this device is the design complexity, requiring the use of bearings, and mounted on the inclined shaft, and bearings require periodic lubrication, which is inconvenient in operation, etc.

Many ventilators and NDA pneumatic actuator is used respiratory bellows, which consists in the fact that breathing fur is tight "bell", in which periodically moves (or exhausted) air under about�certain pressure. This principle is used in ventilators of the type RO-6" produced by the plant "red guard" (St. Petersburg), and also in devices of type "Dräger" (production of Germany). a disadvantage of the pneumatic actuator is design complexity, requiring the use of special additional compressor.

The ventilators "Phase-5", "Phase 21", as well as NDA "Phase-23", produced by JSC "Ural instrument-making plant" (Ekaterinburg), used original crank mechanism - SIMILAR. The disadvantage of this solution is the design complexity, requiring the use of multiple bearings, and spring mechanism for providing a plane-parallel movement of the bellows.

The closest to the proposed by the present invention the device is a device for generating a gas flow for ventilation according to the patent of Russian Federation №2506097 C2 with priority from 25.11.2011,, IPC AM 16/10 - PROTOTYPE. In this device the injection and removal of gas flow is carried out by stepwise changing the direction of the vortex flow created by the impeller. The disadvantage of this technical solution is the complexity of the design, so as to provide a desired gas pressure during inspiration (0.1 ATM) requires a very high-speed �relicate (about 30000 rpm), determining the need for accurate bearings, their lubrication, noise insulation, etc.

The aim of the present invention is to simplify the design of the generator of the flow of breathing gas in the ventilator and NDA in a wide range of changes in its performance, and increase the reliability of its functioning.

This object is achieved in that according to the invention over breathing fur is articulated with it load, which is connected by a flexible connection element directly to the shaft of the actuator, with the possibility of multiple winding mentioned flexible element on the shaft of the actuator and the electronic control unit of the actuator is arranged to provide reverse rotation of the drive shaft with a controlled angular velocity in both directions.

Schematically the proposed device shown in the accompanying drawing, where

1. Breathing fur.

2. The body of the device.

3. Cargo.

4. The inlet check valve.

5. Exhaust check valve.

6. Flexible element.

7. The shaft of the actuator.

8. The actuator with the control unit.

Respiratory fur 1 is a corrugated element, preferably of cylindrical shape, made of rubber and located in such a way that its axis is vertical Orient�tion. The lower edge of breathing fur 1 is hermetically attached to the rigid body of the device 2 and to the upper edge attached to the load 3, the weight of which is calculated so that it could create pressure within the air spaces of the respiratory fur 1, is equal to the maximum allowable pressure in the respiratory circuit of the patient (i.e., approximately 80÷100 cm water column).

In the lower part of the respiratory fur posted 1 intake valve 4 and exhaust valve 5.

To the load 3 is attached to the flexible member 6, which may be made of, for example, in the form of a tape of synthetic or textile material. The thickness of such tape may be about 0.2÷0.5 mm, a width of about 10÷15 mm, and the strength to withstand a load equal to the weight of the load with two or three times supply. Flexible element 6 is rigidly fastened directly to the shaft 7 of the electric drive with a control unit 8 mounted on the casing 2.

The proposed device operates as follows.

During the exhalation cycle by using the control unit to provide rotation of the shaft 7 of the electric drive with a control unit 8, for example, clockwise. Flexible element 6 is wound on the shaft of the actuator 7 and pulls the load 3 and jointed with him breathing fur 1. As a result the volume of the fur increases, there occurs a negative pressure, and fresh digitalnames is sucked in respiratory shirred fur 1 through the inlet check valve 4.

After the end of the exhalation cycle and the transition to the inspiratory cycle using a control unit is provided for the controlled rotation of the drive shaft 7 in the opposite direction (e.g., counterclockwise). The load 3 gravitational force (its own weight) affects the respiratory fur 1, he begins to move down, reducing its volume. This creates excess pressure breathing mixture, and it is through the discharge check valve 5 is supplied to the patient.

The volume supplied to the patient breathing gas is determined by the speed of breathing fur, which is proportional to the number of revolutions of the drive shaft 7, and a respiratory rate of flow is proportional to the angular velocity of rotation of the drive shaft 7. At the same time and the requested number of revolutions of the shaft, and the rotation speed are set via electronic actuator controls 8.

In further cycles of inhalation - exhalation are repeated with a given frequency.

Since in the proposed technical solution the mechanism for converting the rotational motion of the drive shaft into reciprocating motion of the respiratory crimped fur, except for a flexible connection, in fact, has no intermediate kinematic mechanisms (gears, pulleys, cranks, levers, numerous bearings requiring periodic lubrication, etc.), t� generator design flow of breathing gas is greatly simplified, and the reliability of its operation, respectively, is increased.

Under this scheme made the layout of the proposed generator of the flow of breathing gas, preliminary tests which have confirmed its feasibility in the construction of ventilators and NDA.

The generator of the flow of breathing gas containing the actuator with electronic control unit and respiratory fur with inlet and outlet check valves, characterized in that it introduced the goods, hermetically attached to the upper edge of breathing fur, bottom lip breathing fur attached to the generator housing, the load through a flexible connection connected to the shaft of an electric motor, a flexible connection is made with the possibility of multiple winding on the shaft of the actuator, and the actuator controls are designed to provide reverse rotation of the drive shaft with a controlled angular velocity in both directions.



 

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1 tbl

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1 ex

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