Patent US3818900A successfully refreshed from Google Patents.
US3818900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supervising the heart and breathing functions of a patient
Assignee: Siemens AG
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Filing: 1972-06-23
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Granted: 1974-06-25
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Expires: 1992-06-23
Abstract
Abstract A device for supervising the heart and breathing functions of a patient has a common receiving member constructed as a rheographic electrode for receiving a breathing signal and a first heart signal as well as a further receiving member for receiving a second heart signal. 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 via low pass filters as well as with a commonmode rejection device. The invention is particularly characterized in that as current feeding generator is used a an alternating current generator with a frequency lying in the kHz range and that for coupling the current feeding generator or the breathing signal measuring device to the rheographic electrode are used condensers having a capacity lying in the pf range.
Inventors
- 👤 B Nickel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:49
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/085; A61B5/086
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
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 picking up 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 frequency in the kHz range, 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 electrical heart signals, 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.
Claim 2
Independent Claim
187 words
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 picking up 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 frequency in the kHz range, 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 electrical heart signals, 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.
Claim 3
Dependent Claim
36 words
A device in accordance with claim 1, wherein the frequency of said alternating current generator ranges between 30 to 100 kHz and the capacity of said first and second condenser ranges between 20 to 100 pf.
Claim 4
Dependent Claim
38 words
A device in accordance with claim 2, wherein the frequency of said alternating current generator is substantially 60 kHz and wherein at a generator output voltage of substantially 75 V said condensers have a capacity of 22 pf.
Claim 5
Dependent Claim
20 words
A device in accordance with claim 1, wherein the total capacity of said low pass filters is substantially 1.5 nf.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |