Vehicles for research of elektrovozoremontnij teeth

To determine the excitability of the teeth we have developed electrodiagnostic apparatus (EDAR)for the study of both DC and AC voltage city network. The scheme is presented in Fig. 5. Voltage (127 or 220 V) via the power switch on potentiometer P and the neon indicator bulb P. Potentiometer allows you to smoothly adjust the voltage of the primary winding of the transformer T from 0 to 127 (220) C. the voltage of secondary winding changes from 0 to 400 V (effective).

the scheme of the device for electroodontodiagnosis (EDAR)
Fig. 5. The scheme of the device for electroodontodiagnosis (EDAR).

Voltage increase winding straightened tube rectifier, filtered with a capacity of 2 mkF. The filter capacity shunted by resistance 0.5 MW to reduce the time of the establishment of voltage when it is modified.
Rectified voltage is served on the person in the chain that consists of switches type of current P1, P2, P3 key that allows you to interrupt the current in the circuit of the patient, the measuring device, which gives the opportunity to count currents from 1 to 200 MCA and limiting resistance of 0.25+of 4.75+0,25+4,75 IOM.
Sensitivity switch the measuring device A4 has two positions. In one position, the device has a sensitivity 50 microampere, and limiting the total resistance of 10 MW. In the second position, the device has a sensitivity 200 MCA and the total limiting resistance 0.5 MW. The output has a switch P5, allowing to change the polarity of the current.
When the device to AC on the studied voltage increases winding (via selector switch current P1, P2, P3 in the "AC", the key, the measuring device and limiting resistance).
In serial production of devices of various plants has made in its design some changes are not of a fundamental nature.
Recently the medical industry began to produce a new apparatus for electroodontodiagnosis (UN-1), does not require earthing and operating from a network of an alternating current by frequency of 50 Hz, voltage of 127 V and 220 V (Fig. 6).

the scheme of the office of UN-1
Fig. 6. The scheme of the office of UN-1.

The device gives the output pulse voltage, providing circuit current with the following characteristics: 1) repetition rate - 0.5 Hz, 2) the form of pulses of rectangular, 3) pulse amplitude is automatically changed from zero to end value in one of three ranges: 0-10 mA, 0 - 50 microampere, and 0-150 MCA. The device is provided with a device that measures and fixing the amplitude value of current patient with the error not more than 10% at the moment of capturing the evidence and not more than 20% after 20 C.
The set of the device includes the passive electrode in the form of a metal cylinder, active electrode with a rubber liner and active electrode in the form of needles for research from the bottom of the cavity and mouth with root canal (active electrodes are fixed in a special elektrodvigatel).
Disinfection active electrodes produced by boiling. Disinfection of elektrogerate and passive electrode is produced only by handling their surface disinfectant solutions, non-solvent rubber and polystyrene and does not require heating.
The device is mounted in a metal box on the front wall of which there are switch network switch ranges, handle zero measuring device. On the back is a network switch with lock.