Diathermic apparatus.

  • Killerich, Jörgen Gunner Friis
Date:
1932
Catalogue details

Licence: Public Domain Mark

Credit: Diathermic apparatus. Source: Wellcome Collection.

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    \jitr ^ven don 18. AUG. 1932 PATENT SPECIFICATION Application Date: Feb. 24, 1932. No. 5569 32. Complete Accepted: July 28, 1932. COMPLETE SPECIFICATION 377,601 Diathermic Apparatus. 1, Jorgen Gunner Friis Kiilerich, of 4, Itygaards Alie, Ileilerup, Denmark; of Danish. Nationality, do hereby declare the nature of this invention and in what 5 manner the same is to be performed, to be particularly described and ascertained in and by the following statement :— The present invention relates to a dia¬ thermic apparatus adapted] to generate \ 0 continuous high-frequency currents through the parts of the humap. body to be subjected to treatment. The use of continuous high-frequency currents for diathermic treatment is previously known, ^5 the said currents having heretofore been produced by the use of apparatus with a Poulsen-Arc, but the latter have gradually been replaced everywhere by simpler and more economical apparatus which by the 20 use of fast-extinguishing spark gaps pro¬ duce discontinuous high-frequency currents. In comparison with discontinuous currents, however, continuous current 25 possesses many advantages, for instance —continuous high-frequency currents do not act at all on the nerves of the patient, whereas discontinuous currents do so act, 30 —when continuous currents are used the work can be done with far lower supply voltage than is needed for plants adapted to supply discon¬ tinuous currents, where relatively °° high voltages are required for pro¬ ducing sparks ; furthermore the con¬ tinuous action produced by the con¬ tinuous current renders possible the attainment of the same generation ‘id of heat at a lower maximum voltage in the high-frequency circuit, so that dangerous effects will be precluded, —the apparatus can be connected directly to direct-current lighting networks or some corresponding source of power, without the use of special converters or the like. - It lias therefore also been attempted to produce diathermic apparatus for the 50 generation of continuous high-frequency oscillations, which apparatus in order to avoid the complicated and costly Poulsen- [Price 1 / -] but the experiments heretofore have not been entirely successful, one of the 55 reasons being the difficulties in tuning and the requirements with respect to simple and economical operation that have to be fulfilled by apparatus for the purpose here concerned. 60 These drawbacks, however, are avoided by the diathermic apparatus according to the present invention, as by the use of a generator arrangement known per se but heretofore not used in this connection 65 —viz. two electron valves in “ push pull ” position'—it has become possible to produce in simple manner easily tuned and stable continuous high-frequency currents fully satisfying the requirements 70 of diathermic treatment. The invention comprises also as described below various arrangements in the apparatus according to the invention, which arrangements have for their object 75 to cause the apparatus to be entirely use¬ ful in practice, allowing partly the same apparatus to be useful for various medical as well as surgical purposes in the medical and dental art, and partly simplifying the 80 treatment and operation of the apparatus and enabling the surgeon at any time to control and accurately regulate the intensity of current, without having to interrupt the treatment of the patient. 85 In the accompanying drawing Fig. 1 shows in outline a wiring diagram for an apparatus according to the invention, Fig. 2 an electrode-holder containing gn a thermo-couple and a switch, shown , diagrammatically in section, Fig. 3 a modified construction of the arrangement of the thermo-couple in con¬ nection with an electrode-holder, si mi- 95 larly in section. Deferring to the drawing, 1 and 2 are two electron valves connected in push-pull position and adapted in known manner to produce continuous high-frequency 100 oscillations in an oscillation circuit 3, 4, 5. 3 is a tunable condenser, 5 a self-induction coil to the centre of which the anode voltage is applied in known manner. An aperiodic therapeutic <105