SU1530171A1 - Apparatus for measuring electric conduction of skin discharges - Google Patents

Abstract

The invention relates to medical technology, namely to devices for measuring the electrical conductivity of secretions of skin areas. The purpose of the invention is to improve the measurement accuracy by localizing the measurement current in the measurement zone. The device contains a voltage source 1, a voltage-current converter 2, a measurement unit 3, an operational amplifier 4 with a limiting resistor 5, a coaxial electrode 6 consisting of electrically conductive rods 7, a tube 8 and a ring 9. 1 sludge.

Description

ate

CAD

The invention relates to medical technology, namely, devices for measuring the electrical conductivity of the skin and its secretions.

The purpose of the invention is to improve the accuracy of measuring the localization of the measuring current in the measurement zone.

The drawing shows a structural device s. Schema.

A device for measuring (electrical conductivity of the skin I) of skin areas contains G1 sequences; 1 g, 1 h) included sources - 1 1 1 wears, a compressor 2 voltage and I): 1 3 3 measurements, as well as operational amplitude. 4 with the limiting resistor 5 between the output of the inverter and the inverter input amplifier 4 and the coaxial electrode ti, consisting of electrically conductive STS) Ж11 7, t) slab 8 and ring 9. In this case, the rod) 7 is connected to the common ground of the device, and the 11th) output of converter 2 is connected to d) by the slave 8 and the non-inverting input of amplifier 4, the invert which uyuschy entrance (l of the connections with the ring 9.

The electrode 6 has a small size, commensurate with the size of the acupuncture points. So the diameter of the rod is 7 in order of 0.1 mm, the internal diameter of the tube is 8 in order of 1 mm, the diameter of the ring is 9 in order of 1.5-2 mm.

Electrode 6 can be dispensed in two versions. In the first variant, the distance between the electron-conductor rod 7, tube 8 and co-ring 9 within 5-10 mm in height is not locked, it is not a dielectric. Under this option, the count will be measured in electrical conductivity, c. Dependability function:: skin secretions and the day zone and their specific energy; 1 spectra (electrical conductor 1. In the second version, the space between the electrically conductive elements of the electrode 6 is filled with a dielectric, which is responsible for removing fluid changes. The dielectric does not reach the end of the electrically conductive rods 7, the tube 8 and to (JLCa 9 at a distance of about 0.05 0.3 m. M, so that between them a porosity of a certain volume is formed. When the electrode 6 is tightly installed on the skin, an excess The discharge goes through the hole in the dielectric. The second embodiment of the electrode 6 should be used when it is necessary to evaluate not the amount of skin secretion, but their electrical conductivity.

The device has the following image (; m

Electrode 6 is installed on the acupuncture point and, on the skin area, e, 1ECTR (; - the conductivity of which you need to measure. Electrical conductive rod m 7, and tube 8 will flow a fixed value of the electric current created by the transducer. M 2. The current magnitude is determined by the output voltage of the source 1 of the pump and the parameters I of the generator 2. The voltage drop between the electrically conductive rod 7 and the tube 8 is measured by the block m 3 of the measurement, according to indications of which the electrical conductivity is measured skin secretions on this teaching TKE.

However, from an electrical point of view, the skin is a non-linear system with distributed electrical voltage parameters, in which there are areas with anomalous electrical conductivity. Another way is possible for electric current: through the arrays with an anomalously large elec- trodeplate (JB on the surface behind the tube 8. This leads to a decrease in the current between the electrically conductive rod 7 and tube 8, causing an error and ambiguity of readings. The latter is explained by instability layer of skin excretions and, accordingly, a change in the number of electro-anomalous zones, which impinge on the measurement results. But operational amplifier 4 has a high gain factor. to zero (at deep obratg hydrochloric communication which it is covered, through a limiting resistor 5) and potential additional telyyup conductive ring 9 will be equal to the potential yutentsialov tube 8. No difference in area between the conductive kc ltsom 9 and the tube 8 leads

0 to the fact that the electric current of the voltage-to-current converter 2 will not branch off into this circuit and will fully flow between the electrically conductive rod 7 and tube 8.

5 Thus, the introduced additional electrically conducting ring 9 and the operating controller 4 with the limiting resistor 5 eliminate the errors and instability of measurement measurements due to the localization of the measuring current only in the region of the electrically conductive rods 7 and the tube 8.

Claims (1)

Apparatus of the Invention A device for measuring the electrical conductivity of skin exudates, containing a series-connected voltage source, a voltage converter and d lOK measurement, and a coaxial electrode consisting of electrically conductive tubes and a rod that is connected to the second output of the converter voltage-current, common bus and the second input of the measuring unit, the first input of which is connected to an electrically conductive tube, characterized in that, in order to improve the measurement accuracy by localizing measure In the measurement zone, an operational amplifier and a limiting resistor are introduced, and the coaxial electrode is supplemented with an external conductive ring 5130171g which is connected to the inverting non-inverting input of the operating the input of the operational amplifier and its amplifier are connected to an electrically conductive running through the limiting resistor, with a tube.