Diathermic apparatus.

  • Killerich, Jörgen Gunner Friis
Date:
1932
Catalogue details

Licence: Public Domain Mark

Credit: Diathermic apparatus. Source: Wellcome Collection.

    3/6 (page 3)
    5 10 15 20 25 30 35 40 45 50 377,001 3 tained whether the plug lias been turned correctly, .. there is inserted in the apparatus according to the invention, between the wires leading from the source of power, a neon-lamp 20, which for in¬ stance can be seen through a window in the front panel of the apparatus, and which is fitted with two electrodes of un¬ equal size and of special shape, in such a manner that there will be seen for instance a luminuous red letter if the con¬ nection is right, but only a line if the contact plug has been inserted the wrong way. Having now particularly described and ascertained the nature of my said inven¬ tion and in what manner the same is to be performed, I declare that what I claim is :►—i 1. Diathermic apparatus characterized by two electron valves 1 and 2 connected in push-pull position and producing con¬ tinuous high-frequency oscillations in an oscillation circuit 3, 4, 5, which is coupled inductively to the aperiodic therapeutic circuit proper. 2. An arrangement in diathermic apparatus according to claim 1, character¬ ized by a switch 7, 8, 9, which either can couple the therapeutic circuit to the oscil¬ lation circuit 3, 4, 5 by way of a special self-induction coil 6 inserted in the therapeutic circuit, or couple the two circuits directly by using the self-induc¬ tion coil 5 in the oscillation circuit 3, 4, 5 as an auto-transformer, the switch 7, 8, 9 being adapted to be adjusted to different tappings, all depending on the use to be made of the apparatus. 3. An arrangement in diathermic apparatus according to claim 2, character¬ ized by two condensers 10 and 11, respec¬ tively, inserted automatically each in one of the supply wires to two electrodes 12 and 13 in the therapeutic circuit, when the switch 7, 8, 9 is adjusted into one of the positions where the self-induction coil 5 is used as an auto-transformer. 4. An arrangement in diathermic apparatus according to claims 1 to 3, characterized by the feature than an electrode holder 15 for one electrode 12 of the therapeutic circuit contains, in addition to the electrode and if desired a cut-off switch 23, 24 also a thermo-couple 55 16, which is inserted in the supply wire for the electrode 12, and from which the thermo-current is directed to a galvano¬ meter 17 disposed at some suitable point. 5. A modified construction of the 60 arrangement according- to claim 4, characterized in that the thermo-couple 16 is disposed, not in the electrode holder 15 but, instead thereof, in a plug box 2b provided at the end of the supply wire, 65 the said box being adapted, m known manner, to receive holders with electrodes of various shapes. 6. An arrangement in diathermic apparatus according to claims 1 to 3, 70 characterized by the insertion, in the anode circuit common to the electron valves 1 and 2, of a potentiometer 18, for the purpose of regulating continuously the energy of the apparatus. 75 7. An embodiment of the arrangement according to claim 6, characterized in that the potentiometer 18 is disposed in a separate box, which is connected by wires to the apparatus, and is regulated by go means of a pedal operated by the foot. 8. An arrangement in diathermic apparatus according to claims 1 to 3. characterized by a neon-lamp 20 having electrodes of unequal size and being in- 35 sorted between the branches of the supply main and indicating whether the connec¬ tion, by plug contact, to the lighting net¬ work-or other source of power is correct, which lamp in such case for instance qq shows, a letter but, if the plug is turned the wrong way, shows only a line. Dated this 24th day of February. 1932. C HIT IKSH AN K & FA IR WE AT HE 11, 65—66, Chancery Lane, London, W.C.2, and 29, St. Vincent Place, Glasgow, Agents for the Applicant. Redhill: Printed for His Majesty’s Stationery Office, by Love & Malcomson, Ltd.—1932.