US4031884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correlating the respiratory and cardiac cycles
Assignee: Institut National de la Santé et de la Recherche Médicale
•
Filing: 1975-06-02
•
Granted: 1977-06-28
•
Expires: 1995-06-02
Abstract
Abstract An apparatus for correlating the respiratory and cardiac cycles includes a circuit for defining a chosen period in the progress of the respiratory cycle as the end of a regulatable delay beginning when the ascending front of the inspiratorial pressure reaches a regulatable level as well as a circuit for defining a chosen period in the progress of the cardiac cycle as the end of a regulatable delay beginning when the differential dV/dt of the blood pressure reaches a regulatable level. An operator such as a terminal relay is activated upon the coincidence of these two periods in time after a regulatable delay and during a regulatable period.
Inventors
- 👤 Daniel Georges Christian Henzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/54; A61B6/541; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/08; G; G01; G01F; G01F1/00; A61B6/50; A61B6/507
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
An apparatus for correlating respiratory and cardiac cycles comprising: means for defining a chosen period in the progress of the respiratory cycle as the end of a regulatable delay beginning when the ascending front of the inspiratorial pressure reaches a regulatable level, means for defining a chosen period in the progress of the cardiac cycle as the end of a regulatable delay beginning when the differential dV/dt of the blood pressure reaches a regulatable level, means for activating an operator upon the coincidence of these two periods in time after a regulatable delay and during a regulatable period.
Claim 2
Independent Claim
98 words
An apparatus for correlating respiratory and cardiac cycles comprising: means for defining a chosen period in the progress of the respiratory cycle as the end of a regulatable delay beginning when the ascending front of the inspiratorial pressure reaches a regulatable level, means for defining a chosen period in the progress of the cardiac cycle as the end of a regulatable delay beginning when the differential dV/dt of the blood pressure reaches a regulatable level, means for activating an operator upon the coincidence of these two periods in time after a regulatable delay and during a regulatable period.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1 in which the cardiac cycle period defining means includes means for connection to an electrocardiograph.
Claim 4
Dependent Claim
282 words
An apparatus according to claim 1 wherein: the respiratory cycle period defining means includes a first comparator with a regulatable threshold for the inspirational pressure, a first monostable logical circuit connected to the first comparator and having an unstable state whose duration can be regulated for up to 10 seconds, a second monostable logical circuit with an unstable state of one millisecond connected to the first monostable logical circuit and responsive to the rear front portion of the signal generated by the first monostable logical circuit, and a first bistable logical circuit connected to the second monostable logical circuit, the cardiac cycle period defining means includes a differentiator circuit for the blood pressure, a second comparator connected to the differentiator circuit and having a threshold activated by the differentiator circuit, and a third monostable logical circuit with an unstable state of one millisecond connected to the second comparator, and the operator activating means includes a first logical NAND circuit activated by and connected to the first bistable logical circuit and the third monostable logical circuit, a fourth monostable logical circuit having an unstable state the duration of which can be regulated for up to one second connected to the first logical NAND circuit, a fifth monostable logical circuit with an unstable state of one millisecond connected to the fourth monostable logical circuit and responsive to the rear front portion of the signal generated by the fourth monostable logical circuit, a second bistable logical circuit connected to the fifth monostable logical circuit, and a sixth monostable logical circuit having an unstable state duration which can be regulated for up to one second connected to the second bistable logical circuit to feed the operator.
Claim 5
Dependent Claim
81 words
An apparatus according to claim 3 wherein the first and second bistable logical circuits have reset inputs R and further comprising first push-button means for the initial positioning of the first and second bistable logical circuits, a seventh monostable logical circuit with an unstable state and having a negative input connected to and activated by the push-button means, and logical NOR circuit means connected to the seventh monostable logical circuit for activating the reset inputs R of the bistable logical circuits.
Claim 6
Dependent Claim
132 words
An apparatus according to claim 4 further comprising second push-button means, an eighth monostable logical circuit with an unstable state of 100 microseconds and having a negative input connected to and activated by the second push-button means, a third bistable logical circuit having a set input S and a reset input R, the set input S connected to and activated by the eighth monostable logical circuit, the output of the third bistable logical circuit connected to an input of the first NAND logical circuit, and wherein the respiratory cycle defining means includes a ninth monostable logical circuit with an unstable state of one millisecond serially connected to the first comparator, and a second logical NAND circuit activated by and connected to the third bistable logical circuit and the ninth monostable logical circuit.
Claim 7
Dependent Claim
45 words
An apparatus according to claim 5 further comprising a second NOR logical circuit means for activating the reset input R of the third bistable logical circuit and having a plurality of inputs, one input being connected to and activated by the seventh monostable logical circuit.
Claim 8
Dependent Claim
61 words
An apparatus according to claim 6 further comprising a tenth monostable logical circuit with an unstable state of much less than one millisecond and a negative input connected to and activated by the reversed output of the sixth monostable logical circuit, the output of the tenth monostable logical circuit being connected to another input of the second logical NOR circuit means.
Claim 9
Dependent Claim
37 words
An apparatus according to claim 3 wherein the differentiator circuit is arranged in series with a series filter RC and in parallel with a parallel filter RC and both filters have a time constant of 0.1 seconds.
Claim 10
Dependent Claim
148 words
An apparatus according to claim 3 further comprising an automatic syringe equipped with a starting contact to start an injection for the measurement of cardiac output and a stopping contact to end the injection for the measurement of cardiac output, a fourth bistable logical circuit having a set input S connected to and activated by the starting contact and a reset input R connected to and activated by the stopping contact, a third logical NOR circuit means having two inputs, one input of the third logical NOR circuit means connected to and activated by the reversed output of the fourth bistable logical circuit and the other input of the third logical NOR circuit means connected to and activated by the reversed output of the third monostable logical circuit, and relay means connected to the third logical NOR circuit means for controlling the marker of an external recording element.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |