DORC 1100 Gebruiksaanwijzing - Pagina 7

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C. Factors affecting a Diathermy burn :

Several factors affect the nature of a burn obtained in scleral diathermy applications :

1. Voltage

The intensity of the burn is proportional to the voltage level for any given

frequency.

If an insufficient reaction occurs in the scleral application, the voltage (RF level)

must be increased.

A SCLERAL APPLICATION OVER ATTACHED RETINA SHOULD PRODUCE A SMALL

GREY-WHITE SPOT IN THE RETINA.

2. Time

For a given burn intensity, the duration of application is inversely related to the

voltage level. Low voltage must be applied for a longer time to obtain a burn

equivalent to one obtained by applying high voltage for a shorter time.

3. Hydration :

The moistness of the sclera affects the burn in two ways:

A. If the sclera is wet, the impedance is low. This decreases the

voltage and reduces the burn.

B. A wet sclera causes wide dispersion of the current which

also results in a less efficient burn.

4. Location :

The thickness and impedance of the different layers of the eye are variable in

different eyes and in different locations in the same eye.

The sclera is thicker and the impedance is lower in the posterior segment of the

eye. The voltage level or the duration of application must be greater posteriorly

than anteriorly.

The most consistent results are obtained when applications are made at equal

distances from the limbus.

5. Pressure :

Pressure does not seem to affect the diameter of a burn, although greater pressure

will cause a more intense burn as it dries the sclera and decreases choroidal

circulation.

30300300C

D.O.R.C. MICRO DIATHERMY SYSTEM

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