US3818900A - Device for supervising the heart and breathing functions of a patient - Google Patents

Device for supervising the heart and breathing functions of a patient Download PDF

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Publication number
US3818900A
US3818900A US00265944A US26594472A US3818900A US 3818900 A US3818900 A US 3818900A US 00265944 A US00265944 A US 00265944A US 26594472 A US26594472 A US 26594472A US 3818900 A US3818900 A US 3818900A
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US
United States
Prior art keywords
electrode
rheographic
heart
capacity
breathing
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
US00265944A
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English (en)
Inventor
B Nickel
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.)
Siemens AG
Siemens Corp
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Siemens Corp
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Filing date
Publication date
Priority claimed from DE19712131618 external-priority patent/DE2131618C3/de
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3818900A publication Critical patent/US3818900A/en
Anticipated expiration legal-status Critical
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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
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/085—Measuring impedance of respiratory organs or lung elasticity
    • A61B5/086—Measuring impedance of respiratory organs or lung elasticity by impedance pneumography

Definitions

  • the invention is particularly characterized in g that as current feeding generator is used a an alternatt generator with a frequency lying in the [56] References Cited mg kHz range and that for coupling the current feedmg UNITED STATES PATENTS generator or the breathing signal measuring device to 2,66l,734 l2/l953 Holzer et al l28/2.l Z the rheographic electrode are usgd condensers having 3,347,223 10/1967 Pacela.-.
  • This invention relates to a device for supervising the heart and breathing activities of a patient having a receiving member constructed-as a rheographic electrode for jointly receiving a breathing signal and a first heart signal and a further receiving member for receiving a second heart signal, whereby the current feeding generator for the rheographic electrode as well as the device measuring the breathing signals at the rheographic electrode are connected by condensers and by the measuring device for the heart signals with receiving members through low pass filters as well as a commonmode rejection device.
  • the rheographic electrode is fed with current impulses at a repetition frequency of 60 kHz derived from 15 V. voltage impulses and a mark-to-space ratio of 1:1.
  • current feeding generator and the device measuring breathing signals are used solely condensers with a capacity in the nF range (5nf).. This capacitive coupling makes certain that outgoing currents produced in case of a distrubance will not flow through the patient.
  • An object of the present invention is to improve the described prior art devices.
  • Another object is the provision of a device of the described type which provides a substantial improvement of the suppression with simultaneous optionalevaluation of breathing signals with a minimum of technical structure and without any danger for the life of the patient.
  • the current feeding generator alternating current generator with a frequency lying in the kHz range and to use for the coupling of the current feeding generator and the breathing signal measuring device to the rheographic electrode condensers having a capacity within the pf range. It was found particularly advantageous to select for the frequency of the alternating current generator 21 value in the range of 30 to 100 kHz and for the coupling capacities a value in the range of 20 to 100 pf.
  • the present invention operates with a single feeding current frequency lying in the kHi range and not with many. frequencies produced during the impulse operation. Coupling capacities in the pf range dampen this frequency just as strongly as the corresponding frequency in the spectrum of the impulses. However, since there are no frequency contents having a substantially high amplitude, there is then the possibility to balance the produced damping by correspondingly raising the alternating current amplitude without endangering the patient.
  • the technical work is small since instead of an impulse generator only alternating current generator is used, while the heretofore used cheap amplifiers for the electrode signals can be retained to a substantial extent.
  • the frequency of the alternating current generator amounts to approximately 60 kHz.
  • the relative amplitude change is a maximum 0.5% as a rheographic resistance change of i 0.5 ohm and a predetermined rheographic resistance of l kohm).
  • An optional absolute change ata simultaneous optimal suppression (about 50 dB instead of prior about 30 dB') is attained when at a alternating current amplitude of about v. condensers with a capacity of 22 pf are used. Then the capacity of the low pass filters is approximately 1.5 nf.
  • the drawing shows a rheographic electrode 1 for receiving a breathing signal and a heart signal while 2 indicates a EKG electrode solely for receiving a further heart signal.
  • the electrode 3 is the common inactive electrode for the two electrodes 1 and 2.
  • an alternating current generator 5 (75 V., 60 kHz) as feeding current generator for the rheographic electrode 1.
  • a measuring device for breathing signals consisting of a high frequency amplitier 7, a rectifier device 8, a demodulation low pass filter 9 as well as an indicating device 10.
  • the electrodes 1 to 3 are also connected with deep low'pass filters l3 and 14 consisting of inductances 11 and capacities l2 and with an amplifier 15 for com mon-mode rejection (differential amplifier) and a measuring device 16 for heart signals (electrocardiograph).
  • the capacity of the low pass filters amounts to 1.5 nf, their upper limit frequency is about 1 kHz.
  • the alternating current produced by the generator is modulated in amplitude by breathing signals at the patients body.
  • the signal modulated in amplitude (electrode signal) is amplified in the high frequency amplifier 7 of the measuring device'for breathing signals, it is rectified in the rectifier device 8, and demodulated in the demodulation low pass filters 9, the
  • the developed EKG signals get through low pass filsignals of about 0.5% at the assumed rheographic patient resistance of I kohni.
  • the equal tact suppression for the EKG amounts to about 50 dB.
  • a device for supervising the heart and breathing functions of a patient comprising in combination, a rheographic electrode for picking up a rheographic breathing signal and a first electrical heart signal, another electrode for pickingup a second electrical heart signal, a third electrode, being the inactive electrode for said rheographic electrode and said another heart signal electrode, an alternating curreng generator, being electrically connected with said rheographic electrode and said inactive electrode and having a fre-.
  • a first condenser inserted in the electrical connection between said generator and said rheographic electrode and having a capacity in the pf range, means for measuring picked up rheographic breathing signals, an electrocardiograph, electrically connected to said three electrodes and including means for common-mode rejection of the picked up two elecmode rejection device.
  • the comparatively high capactive resistances required due to the low capacitive val ues of these condensers and the comparatively low frequency of the alternating current generator, are used at the same time as current impressing resistances for the sinus-shaped carrier current.
  • said device further comprising a second condenser connecting said means for measuring picked up rheographic signals with said rheographic electrode and having also a capacity in the pf range and low pass filters inserted in the elecrical connection beween said electrocardiograph and said three electrodes and having a capacity in the low nf-range.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pulmonology (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Physiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
US00265944A 1971-06-25 1972-06-23 Device for supervising the heart and breathing functions of a patient Expired - Lifetime US3818900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712131618 DE2131618C3 (de) 1971-06-25 Vorrichtung für die Überwachung der Herz- und Atemtätigkeit eines Patienten

Publications (1)

Publication Number Publication Date
US3818900A true US3818900A (en) 1974-06-25

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ID=5811796

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US00265944A Expired - Lifetime US3818900A (en) 1971-06-25 1972-06-23 Device for supervising the heart and breathing functions of a patient

Country Status (6)

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US (1) US3818900A (forum.php)
AT (1) AT311542B (forum.php)
FR (1) FR2143196B1 (forum.php)
GB (1) GB1397609A (forum.php)
IT (1) IT956740B (forum.php)
SE (1) SE386586B (forum.php)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078553A (en) * 1976-06-14 1978-03-14 Jean Duroux Methods for investigating internal physiological phenomena
US4694837A (en) * 1985-08-09 1987-09-22 Picker International, Inc. Cardiac and respiratory gated magnetic resonance imaging
US4827935A (en) * 1986-04-24 1989-05-09 Purdue Research Foundation Demand electroventilator
US4966155A (en) * 1985-01-31 1990-10-30 The University Of Strathclyde Apparatus for monitoring physiological parameters
CN104939832A (zh) * 2015-05-15 2015-09-30 苏州极致医疗技术有限公司 一种微动呼吸检测装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401340B (de) * 1994-08-05 1996-08-26 Pfuetzner Helmut Dr Anordnung zur synchronen registrierung der leistungsfähigkeit von herz und lunge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661734A (en) * 1945-09-06 1953-12-08 Hartford Nat Bank & Trust Co Arrangement for recording variations in the electrical resistance of the human body
US3347223A (en) * 1964-01-08 1967-10-17 Universal Match Corp Pneumograph
US3476103A (en) * 1965-09-16 1969-11-04 Siemens Ag Electrical amplifier with compensating circuit for measuring purposes,particularly for electrocardiographs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661734A (en) * 1945-09-06 1953-12-08 Hartford Nat Bank & Trust Co Arrangement for recording variations in the electrical resistance of the human body
US3347223A (en) * 1964-01-08 1967-10-17 Universal Match Corp Pneumograph
US3476103A (en) * 1965-09-16 1969-11-04 Siemens Ag Electrical amplifier with compensating circuit for measuring purposes,particularly for electrocardiographs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078553A (en) * 1976-06-14 1978-03-14 Jean Duroux Methods for investigating internal physiological phenomena
US4966155A (en) * 1985-01-31 1990-10-30 The University Of Strathclyde Apparatus for monitoring physiological parameters
US4694837A (en) * 1985-08-09 1987-09-22 Picker International, Inc. Cardiac and respiratory gated magnetic resonance imaging
US4827935A (en) * 1986-04-24 1989-05-09 Purdue Research Foundation Demand electroventilator
CN104939832A (zh) * 2015-05-15 2015-09-30 苏州极致医疗技术有限公司 一种微动呼吸检测装置及方法

Also Published As

Publication number Publication date
FR2143196A1 (forum.php) 1973-02-02
DE2131618A1 (de) 1973-01-11
GB1397609A (en) 1975-06-11
IT956740B (it) 1973-10-10
AT311542B (de) 1973-11-26
SE386586B (sv) 1976-08-16
DE2131618B2 (de) 1976-09-23
FR2143196B1 (forum.php) 1973-07-13

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