US1628806A - Diathermy device - Google Patents

Diathermy device Download PDF

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Publication number
US1628806A
US1628806A US667371A US66737123A US1628806A US 1628806 A US1628806 A US 1628806A US 667371 A US667371 A US 667371A US 66737123 A US66737123 A US 66737123A US 1628806 A US1628806 A US 1628806A
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US
United States
Prior art keywords
electrode
current
coil
diathermy
currents
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Expired - Lifetime
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US667371A
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English (en)
Inventor
Reijnders Franciscus Henricus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NAAMLOOZE VENNOOTSCHAP NEDERLANDSCHE SEINTOESTELLEN FABRIEK
NAAMLOOZE VENNOOTSCHAP NL SEIN
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NAAMLOOZE VENNOOTSCHAP NL SEIN
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Publication of US1628806A publication Critical patent/US1628806A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/40—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals

Definitions

  • the present invention relates to apparatuses and devices for locally generating heat, e. g. in living organisms fluids and similar electrically conductive media.
  • high frequency alternating currents are generated by means of a triode or valve, of which the grid and the anode are each connected to the glowing filament by nieans of a conductor whilst their circuits are electrically connected to each other.
  • a high tension source of current isxincluded between the anode and the cathode and the cathode is supplied from a source of current.
  • the frequency of the generated alternatin r currents is determined by the electricconstants of the said circuit.
  • the quantity of energy which may be taken from this a ratus may be varied by coupling a third cuit electrically to one of the two said cuits and by bringing the be treated Oil.- cirobject or body to in the said third circuit.
  • the principal characteristic of the invention is that means are provided which completely control and regulate the Various physiological phenomena to which the patient is subjected, in accordance with the disease and the sensitiveness of the patient.
  • Said means are partially contained in the oscillation-generator and partially in the electrode. Thereby it is rendered possible to vary not only the intensity of the oscillations and the frequency, but also the temperature of the electrode and its chemical actions.
  • the very high frequencies cause the so-called skin efi'ect, which consists therein that the alternating currents pass exclusively through the periphery of the conducting body.
  • this may be of great advantage; for other purposes for instance for mere depth heating it is however a disadvantage as in that case it is desired to operate at a lower frequency. 4
  • the said conducting bodies enerally have a very small inductance whic will only occur in a high degree when operating at very high frequency.
  • the device is so constructed that it may be connected to the ordinary electric lighting circuit whereby its value for a physician is increased. Also may easily be vders it possible .backs are causes that the skin effectan X-ray tube par-' ticularly of the Coolidge type connected thereto so that the physician need not buy a special X-ray device.
  • a further characteristic of the device consists in the particular grounding which renthatthe physician may touch the patient without, danger of shocks. Further irritation phenomena areprevented or regulated by transmitting the generated alternating current to the human body. by means of a special electrode.
  • the electrodes hitherto used consisted of a conducting object, which was brought into contact with the skin.
  • the conducting sur face usually consisted of metal, sometimes of a layer of some material an electrolyte and thus made conductive.
  • a great quantity of heat will be reduced at the spot, soon causing the elec'troce to get a higher temperature than is desirable.
  • this heating will take place at the edges, as in consequence of the so-called skin effect the current is pressed to the outside of conducting bodies. This causes at the same time disagreeable irritation phenomena at the places of contact.
  • the electrode material should not only conduct the electric current well and should be at the same time a goodheat-conductor, but that the electrode material should be mechanically soft.
  • Various metals, especially those with a. low melting. point are suitable for the purpose, such or other, soaked in- It has appeared that suchas Woods-metal, tin, antimony and various whereas, copper appeared to he peculiarly unsuitable.
  • the deviee may further be provided with a safety device which autonnitically takes care. That. the temperature oi? thepart of the body to he treated is kept within predetermined limits. For instance there may be connected to the electrode a device, the electric properties of which vary in a known manner according to a temperature and which device acts upon the oscillation-generating, the coupling or the cooling of the electrode. i i To better understand the nature of the invention a preferred form of a connection.
  • Figure 1 is a diagram of the. electric circuit.
  • Figures 2 and 3 are side and plan view, respectively, of the fluid cooled electrode.
  • Figure 4 is a Fig. 3.
  • the current is supplied by couductors 1 and 2 from an ordinary alternating-current lighting-plant. Part of this current passing through'the transformer supplies the fila ment of thetriode, which is earthed at 25. Another part of the current is supplied to transformer 4 and passes two circuit controllers 5 and 6 of whichthe former is a safety-contact which is closed, when the ca e containing the high-tension-apparatuses is closed, making it impossible to touch these parts, when working.
  • the controller 0 is of the foot operated type by which the physician is enabled, either to connect the apparatus for a short time or for an indefinite period.
  • a condenser 7 connected across the secondary of the liigh-tension-transformer 4.
  • the coil 8 prevents high-frequency alternating-currents from reaching the transformer 4, whilst the impedance of coil 8' together with the react-ance of the con-- denser 7' prevents the secondary current-of transformer 4 from passing through-con.- denser 10 to earth.
  • the generated hlgh frequencycu'rrents can pass the condenser 10,.
  • the valve. is connected in a very special-way withthe oscillatioi'i-circuit.
  • the grid of the valve is connected with leakage-res:stance 16 Vlfifl. gridcondenser 15, to the one extremity of coil 11, whereas the filament which-1s earthed, is con nected with point 17 of tlns coil.
  • the anode or plate of the valve is connected with the coil 11 inductively as well as directly; inductively by means' of coil 18, which possesses as a rule many windings of thin wire and the extremity of which is directly connected to point 1 of coil 11.
  • the energy used is taken off in this pling-coil 20.
  • the current led through the conductors 21 and-22 is read on the amperemeter 23; at 24 an earth connection is provided, which enables the physician to touch the patient without danger of shocks.
  • the electrode an embodiment of which is illustrated in Figures 2, 3 and 4, is provided with a device for regulating the temperature which is formed by a bent metal tube 26 forming the rim of the ellectrodc and through which a cooling liquid 1' ows.
  • the two halves of the tube are interconnected by means of the plate 27 of electrode material which is clamped. around the tube as is shown in the Figures 3 and 4.
  • the necessary firmness may be obtained by the parts 28, shown in Fig. 2 which are hingedly connected together at 29 so as to allow some deformation of the electrode.
  • the electrode mav by means of resilient sleeves 30 be attached flexibly to a belt or directly by the relay springs, but it is obvious that in mostcases special switches using condensers-or resistances across their contacts W111 be necesshy.
  • the new apparatus can be applied for physiologic-neurologic and pathologicneurologic research inconnection with the extensive variability of the oscillating-frequency, whereby the great advantage is obtained that the irritability as a function of the oscillation-frequency can be expressed in numbers directly.
  • a device for diathermy comprising in combination means for generating hi h fre- 'quency currents of constant intenslty including a trlode and means for ma1nta1n that with a strongly changing load the generating of the apparatus is not interrupted.
  • Device for diathermy comprising in combination, means for generating high frequency currents of constant intensity intherebythat a metallic tube the cooling liqu1d flows is arranged around eluding a triode and an electrode with edges.
  • Device for diathermy comprising in combination means for generating high frequency currents including a triode and an electrode, entirely or partially made of a metal or an alloy of low degree. of hardness, which belongs to the tin group or is an alloy of metals 0 this group, the edges of which may be cooled during the'treatment.
  • Device for diathermy comprising in combination means for generating high frequency current including a triode, two elec trodes, an inductively coupled coil connected with the two electrodes, one end of said coil being grounded.
  • Device for diathermy comprising in combination means for generating high fre quency currents including a triode, a coupling coil inductively coupled to said means and aRontgen tube connected to said coupling coils In testimony whereof I afiix my signature. i

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Electrotherapy Devices (AREA)
US667371A 1922-10-06 1923-10-08 Diathermy device Expired - Lifetime US1628806A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1628806X 1922-10-06

Publications (1)

Publication Number Publication Date
US1628806A true US1628806A (en) 1927-05-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US667371A Expired - Lifetime US1628806A (en) 1922-10-06 1923-10-08 Diathermy device

Country Status (3)

Country Link
US (1) US1628806A (fr)
FR (1) FR572323A (fr)
NL (1) NL14312C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453529A (en) * 1943-07-19 1948-11-09 Mittelmann Eugene Method of high-frequency heating
US2701310A (en) * 1949-01-12 1955-02-01 Du Mont Allen B Lab Inc Oscillatory high-voltage supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453529A (en) * 1943-07-19 1948-11-09 Mittelmann Eugene Method of high-frequency heating
US2701310A (en) * 1949-01-12 1955-02-01 Du Mont Allen B Lab Inc Oscillatory high-voltage supply

Also Published As

Publication number Publication date
FR572323A (fr) 1924-06-04
NL14312C (fr)

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