US1338812A

US1338812A - Electrotherapeutic apparatus

Info

Publication number: US1338812A
Application number: US310352A
Authority: US
Inventors: Wendell L Carlson; Earl C Hanson
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-07-12
Filing date: 1919-07-12
Publication date: 1920-05-04
Anticipated expiration: 1937-05-04

Description

UNITED STATES f PATENT opinion;

wannam. cannson AND mm. '0. nausea; or WASHINGTON, ms'rmc'r or r commrm.

nmcraornaaarsu'rxc APPARATUS.

7 '0 all whom it may concern.-

Be it known that we, WENDELL L. CARL- SON and EARL C. HANSON, citizens of the United States, residing at Washington, District of Columbia, have invente certain 'new and useful Improvements in Electrohigh frequency currents for imparting bene-' ficial effects to the body.

Heretofore difliculty has been experienced in obtaining steady sustained currents of a frequency that would not affect the nervous stood by referring to the accompanying system of the patient under treatment. Present high frequency apparatus is not satisfactory for the reason that the patient is subject to severe shocksfrom currents of a varying frequency. a

Our invention will bemore fully underdrawings in which the three figures are diagrammatical illustrations of different forms of applicants invention. In Figure 1 nu meral 1 represents an oscillating vacuum tube having a filament 2 heated by a battery 3, a grid 4 connected throu h the inductance 6 to the filament 2. The p ate 5 is connected through' the inductance 7 and through a direct current high voltage generator 8 to the filament 2. The generator 8 is shunted by a high capacity fixcdcondenser 9. Inductively coupled to the

inductances

6 and 7 is an inductance 10 which is connected in a series circuit consisting of the variable capacity 11,

electrodes

12 and 14 and thermoamrneter 13. In Fig. 2 inductance 10 has one terminal grounded at 1.5 through thermo-ammeter 13, the other terminal of which is connected to a vacuum electrode 16. Fig. 3 shows diagrammatically the inductance 10 connected through the variablecapacity 11 to the inductance coil 17 and a thermo-ammeter 13. In Fig. 1 the

electrodes

12 and 14 are suitably constructed so as to be applied directly to the body of the patient. The oscillating currents set up in the circuit above described passing through the body between the

electrodes

12 and 14 produce a highly beneficial effect. All of the inductances employed are. variable as indicated by the arrows. I x

I The operation of the system is as follows:

Specification ot Lettorslatent.

' Patented May 4.1920.

Application an July 12, 1919. Serial in. 310,852

The oscillatin vacuum tube circuitshown" in F i l is a justed so as to generate sustaine high frequency-oscillations. The inductance 10 is inductively coupled

tothe inductances

6 and 7, the result of which is the transfer of high frequency energy to the circuit comprising the inductance l0, variable condenser 11, electrodes 12'and 14 and thermo-ammeter 13. In ele'ctrotherapeutics this current is known as the-DArsonval current.

In Fig, 2 theinductance 10 is shown connected in circuit with a vacuum electrode 16,

thermo-ammeter 13 and. ground 15. The

vacuum electrode 16 is applied to the surface of the body and produces the wellknown Tesla current effect. 1

In Fig. 3 the inductance coil.17 is substituted for the

electrodes

12 and 14 shown in Fig. 1 and brought near the patients body. High frequency current is induced in the patients body due to the eddy current effect produced by the magnetic field created around the inductance 17 by the sustained high frequencycurrents surging therein. The circuits are adjusted to resonance at a frequency substantially. above that frequency which would be detected by the nervous system of the body.

In the practical operation of this system the advantages over the methods used in the prior art lie in the fact thatsteadysustained high frequency oscillations are produced by the oscillating vacuum tube circuit in lieu of the unsteady currents produced by the apparatus as now employed in e lec-v I trotherapeu'tics.

We claim:

1. In electrotherapeutics, the combination of an oscillating vacuum tube circuit. for the generation of sustained high frequency cur-- rents substantially above that frequency which effects the nervous system of the body, with means for tuning the oscillating circuit, and means for'applying said sustained high frequency currents to the body of a patient to produce beneficial effects therein,

substantially as and for the purpose described. 1

2. In electrotherapeutics, the combination with a, plurality of-hand electrodes 'connected in circuit with a variable capacity and inductance, and an indicating meter, of a vacuum'tu'be oscillating circuit associated with said inductance and adapted to produce steady sustained high frequency oscillations, substantially as and. for the purpose described.

3; In electrotherapeutics, a vacuum tube oscillator adapted to produce sustained 0scillations, and means for tuning said oscillations, said vacuum tube oscillator including a circuit containing inductances, in com bination with a circuit containing, means for applying said current. to the body, substantlally as and for the purpose described WENDELL L. 'CARLS'ON. EARL c. HANSON. I