US3050695A - Pulse generator for human treatment - Google Patents

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Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
  • A61N1/00—Electrotherapy; Circuits therefor
  • A61N1/18—Applying electric currents by contact electrodes
  • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
  • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
  • A61N1/00—Electrotherapy; Circuits therefor
  • A61N1/18—Applying electric currents by contact electrodes
  • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
  • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
  • A61N1/36014—External stimulators, e.g. with patch electrodes
  • A61N1/3603—Control systems
  • A61N1/36034—Control systems specified by the stimulation parameters

Definitions

• This invention relates to pulse generators, the electrical output from which is applied to the human body for the treatment thereof, and more particularly to improvements therein.
• pulses are applied to the heart, either as a pacemaker to maintain its regular rhythmic beat or as a defibrillator, for the purpose of stopping heart brillation.
• the pulse generator apparatus employed w-as plugged into the house lighting circuit from which power for the operation thereof was derived.
• An object of the present invention is to provide a pulse generator for use in -treating the human body wherein accidental shocks cannot occur.
• Another object of the present invention is the provision of a novel pulse generator for treating the human body which is operated independently of the usual llO-volt power sources.
• Still another object of the present invention is to provide a portable pulse generator for treating the human body which can be used anywhere.
• a fur-ther object of the present invention is the provision of a pulse generator for treating the human body which does not require expensive insulation precautions.
• transistors respectively 10, 12, 14, and 16.
• Each transistor has a base 10B, 12B, 14B, 16B, a collector 10C, 12C, 14C, and 16C, and an emitter 10E, 12E, 14E, and 16E.
• Transistors lll, 12, and 16 are of the same type which is indicated in the drawings as the PNP type, and transistor 14 is of the NPN type.
• a switch 18 In order to initiate operation of the pulse oscillator, a switch 18 is closed. This applies power from a 9-volt battery 20 to all the transistors.
• the two transistors 1G, 12 are interconnected by resistors and capacitors to form rarice a multivibrator oscillator.
• the resistor 22 is connected between the battery power source and the emitters 10E, 12E.
• Resistor 24 is connected from the battery power source to the base 12B.
• Resistor 26 is connected from the battery power source to the base 10B.
• a collector load resistor Z3 is connected between the negative terminals of the battery Ztl and the collector 12C.
• a second collector load resistor 30 is connected between the battery negative terminal and the collector 10C.
• a base bias resistor 32 connects the collector 10C to the base 10B.
• Another base bias resistor 34 connects the collector 12C to the base 12B.
• the ybase 12B is coupled to the collector 16C through either capacitor 36 or capacitor 33. as may be selected by the switch arm 401.
• the base 1GB is coupled to the collector 12C through either capacitor 42 or 44 as selected by the switch arm 46.
• the switch arms 40, 46 are ganged to make the capacitor selection simultaneously. The switching between capacitors determines the frequency of oscillation of the multivibrator.
• Transistors 10, 12, and 16 are Western Electric type 2N226 and transistor 14 is RCA type 2N35. These values are to be taken as exemplary, and not by way of restriction of the invention. Assume, now, that when the switch 18 is closed due to transient disturbances, the transistor 10 will first become conductive. It will conduct in saturation.
• Output from the multivibrator is derived ⁇ from the collector 12C.
• This collector is connected through a resistor 5t? to the base 14B of the transistor 14.
• Transistor 14 is connected in the circuit to act as the gate. Normally, it is in lits nonconducting, or biased-off, state. Upon receiving a pulse from the multivibrator, it is enabled to conduct and transmit a pulse to the succeeding portion of the circuit.
• the emitter of transistor 14, which is of the NPN type, is connected to the negative side of the battery 20 through a resistor 52.
• the collector 14C of lthe transistor 14 is connected through a capacitor 54 to the positive terminal of the battery 20.
• transistor 14 Upon the application of a positive pulse from the collector ⁇ 12C to the base 14B, transistor 14 can become conductive, whereupon a current pulse is enabled to llow through capacitor 54.
• This current Ipulse is applied to transistor i16, which is connected in a blocking-oscillator type of circuit.
• This blocking-oscillator circuit is quiescent until a pulse is received from the transistor 14, at which time it will commence oscillating and will continue to oscillate as long as the pulse is maintained.
• the duration of the applied pulse is determined by the value of the capacitor 54 ⁇ and the resistors connected to the transistor 14, through which it is enabled to discharge.
• a step-up transformer 56 has a primary winding 5613, which is tapped.
• One end of the primary winding is connected to the collector 16C of transistor 116, and the other end of the primary winding is connected through a capacitor 58 to the base 16B of transistor 16.
• the col ector 14C of transistor 14 is connected to the tap on the primary winding 56?.
• a resistor 61) is connected between the tap on the primary winding and the base 16B f transistor 16.
• the secondary Winding 56S of the transformer S6 has connected thereacross a neon lamp 62 in series with a current-limiting resistor 64. This lamp will illuminate for each pulse and serves to indicate whether the circuit, and, more specioally, the battery, are functioning adequately.
• One end of the secondary winding 56S is connected through a potentiometer 66 to a iirst output terminal 68.
• the other end of the secondary winding 56S is connected to a switch 70.
• the switch 7@ will connect to either an output terminal 72 or through a rectifier '74- to another output terminal 76.
• a capacitor 78 serves in conjunction with rectifier 74 to provide pulsed direct current at output terminals 68 and 76 when the switch 7G* is connected to the rectifier 74.
• Output terminals 68 and 72 provide pulse alternating current.
• Potentiometer 66 serves to adjust the selected type of output voltage to a desired amplitude.
• the output terminals 68 ⁇ and 72 or 68 and 76 may be connected to any type of electrode desired for applying the oscillation pulses to the human tbody.
• the electrodes may take the form of sponges which are moistened with an electrolytic fluid. These electrodes may be the type required where it is desired to provide either pacemaker or defibrillator type of operation. Since the circuit is completely independent of the usual 11G-volt sources, no
• the device is completely portable. As may be seen from the drawing, the components are simple and inexpensive, and since the usual eavy insulation as well as electrical underwriter precautions are not necessary with the type of low-voltage circuits shown, the system is much simpler and cheaper to manufacture than those of other types for this purpose.
• a pulse generator for human treatment comprising a multivibrator circuit of the continuously oscillating type including ya first and second transistor, a third transistor, means biasing said third transistor to be nonconductive in the quiescent state, means for applying output from said second to said third transistor to render said third transistor conductive responsive thereto, a blocking oscillator circuit including a fourth transistor, means for appl-ying output from said third to said fourth transistor to render said blocking oscillator circuit oscillatory responsive thereto, output terminals, rectifier means connected to said output terminals, and switch means for selectively applying output froml said blocking oscillator directly to said output terminals or to said rectifier means.
• said blocking oscillator output circuit includes a transformer having a tapped primary and secondary winding, means connecting said tapped primary winding -to said fourth transistor, a -glow lamp, a resistor, and means connecting said glow lamp and resistor in series across said secondary winding whereby said glow lamp can indicate when said blocking oscillator circuit is operative.

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• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Radiology & Medical Imaging (AREA)
• Animal Behavior & Ethology (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Heart & Thoracic Surgery (AREA)
• Biophysics (AREA)
• Electrotherapy Devices (AREA)

Description

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=25278837

Family Applications (1)

Country Status (1)

Cited By (23)

Citations (5)

• 1959
  • 1959-09-10 US US839093A patent/US3050695A/en not_active Expired - Lifetime

Patent Citations (5)

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