SU878303A1 - Micrometering device - Google Patents

Description

(54) MICRODESE

The invention relates to the field of medical technology, namely to devices for administering drugs to the body.

Automatic syringes containing a chamber with a dosing liquid, an electrohydraulic drive and a control system 1 are known.

The closest to the proposed invention to the technical essence and the achieved result is a device for the dosed introduction of liquid substances, containing a container for the dosed liquid; a movable membrane, an electric actuator, 15 made in the form of a closed chamber filled with the working fluid, inside which a diaphragm and electrodes, power supply and control units 2 are placed.

As the current passes through the electrodes 20, the pressure in the electrolysis chamber increases and through the intermediate chamber filled with water is transferred to the separation diaphragm. The dose and rate of injection is regulated by the power supply and control system 25, which includes an amplifier, a transducer, a signal level controller, and instrumentation.

However, the known devices have a complicated and inconvenient 30

The design contains a complex system of transferring pressure to the working diaphragm, consisting of auxiliary tanks, pipelines and valves.

The aim of the invention is to simplify the design.

This goal is achieved in that a microdosing device containing a container for a metered liquid; movable membrane; electric drive, made in the form of a closed chamber filled with working fluid, inside which a diaphragm and electrodes, power supply and control units are placed; the diaphragm is made of microcapillary and dielectric material, the electrodes are made of mesh and are installed on both sides of the diaphragm coaxially with it, and the membrane is in contact with the container.

FIG. 1 shows a functional block diagram of the device; in fig. 2 shows the structural scheme of the micro-dosing device itself.

The device contains a drive and a container with a metered liquid, a power and control unit 2, which includes a control unit 3 and a generator of 4 periodic signals (GSGP). In the microdispenser, the container 5 with a portion of its surface that is dosed with liquid contacts one

6 drive motor diaphragms. The engine consists of a working chamber filled with a working fluid, such as distilled water, which contains a microcapillary dielectric diaphragm 7 with grid electrodes 8 placed in housing 9. the patient is provided with a pipe 11.

The device works as follows.

When the supply voltage is applied to the power and control unit 2 (Fig. 1), a series of pulses of a certain amplitude, duty ratio and duration is generated in it. This series of pulses is applied to the grid electrodes 8 (Fig. 2) of the drive motor. The potential difference across the electrodes 8 (Fig. 2) causes the working fluid to flow from the left side of the working chamber of the drive motor to the right through the microcapillary structure of the dielectric diaphragm 7. The overpressure created in this way in the right side of the working chamber of the drive motor distorts through the separation membrane 6 tank 5 with a pharmacological fluid, creating in it the necessary back pressure to inject the dose into the patient.

The flow rate of the working fluid through the diaphragm and the value of the overpressure in the right part of the working chamber of the engine depend on the parameters characterizing the voltage applied to the grid electrodes. Using the power and control unit 2 (Fig. 1), it is possible to adjust the amplitude, duty cycle and duration of the pulses and thereby control the dosage and injection rate with sufficient accuracy and in a wide range.

The main advantages of the proposed microdispenser are the simplicity and compactness of its design, ease of use, and quick changeover. The drive works silently, without vibration and trki. The presence of a small number of parts, the absence of moving contacts, valves, hinges and other kinematic connections increases the reliability of the device and creates prerequisites for its use as an implantable microbatcher.

Claims (2)

1. A microdispenser containing a container for the metered liquid, a membrane mounted for movement, an electric drive, made in the form of a closed chamber filled with the working fluid, inside which a diaphragm and electrodes are placed, power supply and control units, characterized in that simplify the design of the microbatcher, the diaphragm is made of microcapillary and dielectric material, the electrodes are made of mesh and mounted on both sides of the diaphragm coaxially with it, and the membrane is installed with the possibility of contact with the container. 2. Microdispenser according to Claim 1, characterized in that the container for the liquid to be dosed is made in the form of a removable elastic chamber. Sources of information taken into account in the examination: 1. Zhukov I. I. Electrokinetic properties of capillary systems. M., State Publishing House, 1956, p. 20-22. 2. USSR author's certificate number 492286, cl. A 61 M 5/00, 1971. , L patient Phi2.1