US3650264A - Apparatus for electro-medical investigation - Google Patents

Apparatus for electro-medical investigation Download PDF

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Publication number
US3650264A
US3650264A US881462A US3650264DA US3650264A US 3650264 A US3650264 A US 3650264A US 881462 A US881462 A US 881462A US 3650264D A US3650264D A US 3650264DA US 3650264 A US3650264 A US 3650264A
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United States
Prior art keywords
carrier wave
electric signals
frequency
accordance
strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US881462A
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English (en)
Inventor
Frits Jacques Janssen
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US Philips Corp
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US Philips Corp
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Publication date
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Publication of US3650264A publication Critical patent/US3650264A/en
Assigned to HONEYWELL B.V. AMSTERDAM,A SUBSIDIARY OF THE NETHERLANDS OF HONEYWELL INC. A DE CORP. reassignment HONEYWELL B.V. AMSTERDAM,A SUBSIDIARY OF THE NETHERLANDS OF HONEYWELL INC. A DE CORP. ASSIGNOR ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE RECITED. (SEE RECORDS FOR DETAILS). Assignors: U.S. PHILIPS CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/332—Portable devices specially adapted therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/7405—Details of notification to user or communication with user or patient ; user input means using sound
    • A61B5/7415—Sound rendering of measured values, e.g. by pitch or volume variation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation

Definitions

  • ..A61l5/04 wave is modulated both in qu n y a d in mplitude in ac- 53 Field 01 Search 1 28/206 A, 2.06 F, 2.06 R, eerdenee with the aforesaid pp electric eignele-
  • the level 123/2 1 A, 2 5 T of the fundamental tone normally remains below the limit of audibility.
  • This invention relates to an apparatus for providing an audible indication of the strength of electro-physiological signals produced in the human body, for example, electrical voltages and currents produced by the action of the heart.
  • Such apparatus are known in which an audiofrequency carrier wave is used whose frequency is modulated by the applied signals, while signal strength alterations become manifest by variations of the pitch of the tone.
  • Such an apparatus can pick up the electrical signals from the heart, which are then reproduced in the form of a sound varying in pitch.
  • the constantly audible fundamental tone makes the distinction of the separate heart complexes difficult so that auscultation is a fatiguing strain.
  • the invention has for its object to avoid said disadvantages and to facilitate quick recognition of the most lethal cardiac diseases such as fibrillation, arrest and arrhythmia.
  • the audiofrequency carrier wave is modulated in accordance with the applied electrical signal both in frequency and in amplitude.
  • the amplitude modulation may be adjusted so that the sound level of the nonaudible audiofrequency tone is raised in the presence of a signal until the limit of audibility is transgressed, after which alterations of the signals become manifest in differences of pitch and strength.
  • the sound level of the fundamental tone may be reduced to a value below the limit of audibility without the desired information getting lost or being markedly weakened.
  • FIG. 1. is a simplified circuit diagram of the apparatus in accordance with the invention.
  • FIG. 2. relates to one embodiment of the apparatus.
  • the signal supplied by the amplifier 4 is applied via the rectifier 8 to the amplitude modulator 9 which modulates the amplitude of the frequency-modulated signal coming out of the audiofrequency oscillator 5 in accordance with the strength of the signal from the amplifier 4.
  • An amplifier 10 with gain control supplies the signal to the sound reproducing device 11 in which it is converted into an audible tone.
  • the required parts of the circuit described are accommodated in a housing 12 composed of a suitable synthetic resin.
  • the shape of the housing [8 to some extent adapted to the manner in which the apparatus is employed.
  • the required number of contact arms 13, 14 and 15 are provided on the housing 12. These arms may, if necessary, be movably fastened in order to allow some relative displacement.
  • the housing is furthermore provided with a rocker 16 for actuating the switch 6.
  • the gain of the amplifier 10 is adjusted by means of a rotatable or slidable knob 17.
  • a plurality of slots 18 in the housing 12 provide an outlet for the produced sound.
  • An apparatus for providing an audible indication of the strength of electric signals produced in the human body by heart activity comprising, means for generating an audiofrequency carrier wave, means for modulating the frequency thereof in accordance with the strength of the electric signals, and means for amplitude modulating the frequency modulated carrier wave so as to vary the tone strength of the carrier wave in accordance with the strength of the electric signals applied to the apparatus.
  • a device for the audible observation of heart activity comprising, at least two electrodes adapted to derive electric signals from the body produced by the action of the heart, means for generating an audio frequency carrier wave, amplifier means having an input coupled to said electrodes, means for coupling the output of said amplifier means to an input of said audio frequency generating means whereby the carrier wave is frequency modulated in accordance with said electric signals, means coupled to the output of said amplifier means and to the output of said audio frequency generating means for amplitude modulating the frequency modulated carrier wave in accordance with said electric signals derived from the human body, and means responsive to the amplitude and frequency modulated carrier wave for producing an audible indication thereof.
  • a device as claimed in claim 2 further comprising rectifier means connected between the output of said amplifier means and an input of said amplitude modulating means.
  • a device as claimed in claim 2 further comprising means for suppressing the audio frequency carrier wave whenever the electric signals are below a given threshold level.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Medical Informatics (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Cardiology (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
US881462A 1968-12-04 1969-12-02 Apparatus for electro-medical investigation Expired - Lifetime US3650264A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6817326.A NL158695B (nl) 1968-12-04 1968-12-04 Toestel voor het verschaffen van een hoorbare weergave van elektro-fysiologische signalen.

Publications (1)

Publication Number Publication Date
US3650264A true US3650264A (en) 1972-03-21

Family

ID=19805322

Family Applications (1)

Application Number Title Priority Date Filing Date
US881462A Expired - Lifetime US3650264A (en) 1968-12-04 1969-12-02 Apparatus for electro-medical investigation

Country Status (9)

Country Link
US (1) US3650264A (xx)
JP (1) JPS507863B1 (xx)
BE (1) BE742546A (xx)
DE (1) DE1960420A1 (xx)
DK (1) DK122104B (xx)
FR (1) FR2025238A1 (xx)
GB (1) GB1241924A (xx)
NL (1) NL158695B (xx)
SE (1) SE362198B (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074710A (en) * 1976-05-28 1978-02-21 City Of Hope National Medical Center Intrathoracic pressure biofeedback method
FR2502932A1 (fr) * 1981-04-06 1982-10-08 Vsesojuznyj Kardiologitsches Dispositif de positionnement d'un capteur de signal d'echo et des capteurs de signaux electriques d'un appareil cardiographique
US4576178A (en) * 1983-03-28 1986-03-18 David Johnson Audio signal generator
US4784153A (en) * 1986-11-12 1988-11-15 Marks Lloyd A Method of and apparatus for detecting cardiac rhythm disturbance
US4803996A (en) * 1987-09-28 1989-02-14 Nippon Colin Co., Ltd. Cardiovascular monitor
US4858617A (en) * 1987-09-10 1989-08-22 Ith, Inc. Cardiac probe enabling use of personal computer for monitoring heart activity or the like
WO1992010134A1 (en) * 1990-12-04 1992-06-25 Evert Knutsson Apparatus for measuring the transport time of nerve signals
US5388587A (en) * 1990-12-04 1995-02-14 Dorsograf Ab Method and apparatus for measuring the transport time of nerve signals excited in different dermatoms of a patient
US5730140A (en) * 1995-04-28 1998-03-24 Fitch; William Tecumseh S. Sonification system using synthesized realistic body sounds modified by other medically-important variables for physiological monitoring
GB2447547A (en) * 2007-03-12 2008-09-17 Gen Electric Method And System For Patient Evaluation Using An Electrocardiogram
US20110201953A1 (en) * 2010-02-16 2011-08-18 General Electric Company Method and system for patient evaluation
US20110201954A1 (en) * 2010-02-17 2011-08-18 General Electric Company Method and system for patient evaluation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5380964U (xx) * 1976-12-08 1978-07-05
US4166455A (en) * 1978-01-25 1979-09-04 Howmedica Inc. Apparatus and method for non-invasive detection of strictures in conductive fluid conduits

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918054A (en) * 1957-09-09 1959-12-22 Peter A Goolkasian Electrically responsive repetitive-surge indicators
AT250557B (de) * 1963-09-10 1966-11-25 Helmut Dr Kronschwitz Kardioskop
US3338234A (en) * 1964-06-09 1967-08-29 Benjamin B Kleinerman Heart activity detector and display device
US3413546A (en) * 1965-12-28 1968-11-26 Thiokol Chemical Corp Electronic circuitry for analyzing electroencephalographic waveforms
US3426150A (en) * 1965-09-27 1969-02-04 Lockheed Aircraft Corp System for fm transmission of cardiological data over telephone lines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918054A (en) * 1957-09-09 1959-12-22 Peter A Goolkasian Electrically responsive repetitive-surge indicators
AT250557B (de) * 1963-09-10 1966-11-25 Helmut Dr Kronschwitz Kardioskop
US3338234A (en) * 1964-06-09 1967-08-29 Benjamin B Kleinerman Heart activity detector and display device
US3426150A (en) * 1965-09-27 1969-02-04 Lockheed Aircraft Corp System for fm transmission of cardiological data over telephone lines
US3413546A (en) * 1965-12-28 1968-11-26 Thiokol Chemical Corp Electronic circuitry for analyzing electroencephalographic waveforms

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074710A (en) * 1976-05-28 1978-02-21 City Of Hope National Medical Center Intrathoracic pressure biofeedback method
FR2502932A1 (fr) * 1981-04-06 1982-10-08 Vsesojuznyj Kardiologitsches Dispositif de positionnement d'un capteur de signal d'echo et des capteurs de signaux electriques d'un appareil cardiographique
US4576178A (en) * 1983-03-28 1986-03-18 David Johnson Audio signal generator
US4784153A (en) * 1986-11-12 1988-11-15 Marks Lloyd A Method of and apparatus for detecting cardiac rhythm disturbance
US4858617A (en) * 1987-09-10 1989-08-22 Ith, Inc. Cardiac probe enabling use of personal computer for monitoring heart activity or the like
US4803996A (en) * 1987-09-28 1989-02-14 Nippon Colin Co., Ltd. Cardiovascular monitor
WO1992010134A1 (en) * 1990-12-04 1992-06-25 Evert Knutsson Apparatus for measuring the transport time of nerve signals
US5313956A (en) * 1990-12-04 1994-05-24 Dorsograf Ab Apparatus for measuring the transport time of nerve signals
US5388587A (en) * 1990-12-04 1995-02-14 Dorsograf Ab Method and apparatus for measuring the transport time of nerve signals excited in different dermatoms of a patient
US5730140A (en) * 1995-04-28 1998-03-24 Fitch; William Tecumseh S. Sonification system using synthesized realistic body sounds modified by other medically-important variables for physiological monitoring
GB2447547A (en) * 2007-03-12 2008-09-17 Gen Electric Method And System For Patient Evaluation Using An Electrocardiogram
US20080228091A1 (en) * 2007-03-12 2008-09-18 General Electric Company Method and system for patient evaluation
GB2447547B (en) * 2007-03-12 2012-02-22 Gen Electric Method and system for patient evaluation
US20110201953A1 (en) * 2010-02-16 2011-08-18 General Electric Company Method and system for patient evaluation
US20110201954A1 (en) * 2010-02-17 2011-08-18 General Electric Company Method and system for patient evaluation

Also Published As

Publication number Publication date
BE742546A (xx) 1970-06-02
DK122104B (da) 1972-01-24
GB1241924A (en) 1971-08-04
SE362198B (xx) 1973-12-03
DE1960420A1 (de) 1970-06-18
NL158695B (nl) 1978-12-15
JPS507863B1 (xx) 1975-03-29
NL6817326A (xx) 1970-06-08
FR2025238A1 (xx) 1970-09-04

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Owner name: HONEYWELL B.V. AMSTERDAM, HOLLAND A SUBSIDIARY OF

Free format text: ASSIGNOR ASSIGNS THE ENTIRE INTEREST, SUBJECT TO LICENSE RECITED.;ASSIGNOR:U.S. PHILIPS CORPORATION;REEL/FRAME:003979/0375

Effective date: 19820305