GB435547A - Improvements in and relating to electro medical apparatus - Google Patents

Abstract

435,547. Electromedical apparatus. CAESAR, V., 35, K÷nigstrasse, Stuttgart, Germany. March 16, 1934, No. 8360. Convention date, March 16, 1933. [Class 81 (ii)] In medical apparatus for treatment with electric oscillations means are provided for producing continuous irregular changes in the character of the oscillations ; in particular the magnitude of the current, the voltage, the frequency, the wave-form, and the periods of closure and breakage of the circuit may be subjected to variation. As shown the oscillating circuit comprises a push-pull valve rectifier 18, 19, supplied through a transformer 14 from mains 11 and supplying high tension current to a thermionic valve V the anode circuit of which includes a coil 101 and the grid circuit coils 82. The insulated patient may be connected by a lead 107 to a coil 105 on the core 100 of the coil 101, the other end of coil 105 being earthed ; alternatively treatment-circuit plates 110, 111, may be connected through block condensers 112, 113, across the coils 82, or the patient may be connected to one side of these coils with or without earthing of the other side. The lead 50 from the rectifier 18, 19, to valve V includes choke coils 52, 54, the coil 52 having across it smoothing condensers 60, 61, with a central point connected by a lead 62 with the return lead 64, 51, from the valve V. The character variations in the oscillations are obtained by rotary switches driven by rheostat or brake-controlled motors 37, 30, 67, 85, 95. The switch 36 periodically interrupts the current supply to the transformer 14, through leads 12, 13, the switch 24 effecting successive cutting in and then cutting out of parallel resistances 23 in the same supply. The switch 66 effects similar cutting in and cutting out of resistances 53 in the high-tension lead 50. Switches 84, 94, operate respectively to cut in and then cut out parallel condensers 81 and the parallel inductances 82, themselves in parallel in the grid circuit of the valve V. The wave-form is affected by surges produced by closing switch 36. The Specification as open to inspection under Sect. 91 describes an electrode for use with the above apparatus comprising a rubber or like sheath enclosing but spaced from a central conductor. The sheath may in use be coated with medicament such as a silver salt solution, and, when used in the urethra or uterus, may comprise an elongated tube closed at its free end, curved to fit the cavity treated, and carrying an obturator for the urethral or uterine orifice. This subjectmatter does not appear in the Specification as accepted.