US4078554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spirometric device
Assignee: Synthelabo SA
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Filing: 1976-09-15
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Granted: 1978-03-14
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Expires: 1996-09-15
Abstract
Abstract A spirometric device for connection to the respiratory piping system of a patient and wherein a delivery pickup system is situatable on an exhalation branch of the system. The signals transmitted by a pressure pickup included in the device and situated on the respiratory system and those transmitted by the delivery pickup are led to a computing and measuring assembly which integrates the delivery signals while correcting these as a function of the pressure variations and/or of the errors caused by the gas contained in the respiratory system.
Inventors
- 👤 Andre Emmanuel Le Maitre
- 👤 Roger Paul Charles Cavallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:55
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/087; A61B5/09; A61B5/72; A61B5/7235; A61B5/7242; A61M; A61M16/00; A61M16/021; A61M16/022; A61M16/024; A61M16/0003; A61M2016/003; A61M2016/0033; A61M2016/0039
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A spirometric device for connection to a respiratory piping system of a patient comprising: a delivery pickup means for location on an exhalation branch of the system and responsive to signals transmitted thereby to generate delivery signals proportional to rate of flow, a pressure pickup means for situation on said system and responsive to signals transmitted thereby to generate pickup signals, a computing and measuring means for integrating the delivery signals and correcting the integrated output as a function of pressure variations to supply a corrected signal, parallel circuit means responsive to said pressure signals for detecting the maximum pressure and the minimum pressure, first subtracting means for obtaining an analogical signal proportional to the difference of said maximum and minimum pressures, and means for supplying the output of said first subtracting means to said computing and measuring means for correcting said integrated output.
Claim 2
Dependent Claim
144 words
A spirometric device for connection to a respiratory piping system of a patient comprising: a delivery pickup means for location on an exhalation branch of the system and responsive to signals transmitted thereby to generate delivery signals proportional to rate of flow, a pressure pickup means for situation on said system and responsive to signals transmitted thereby to generate pickup signals, a computing and measuring means for integrating the delivery signals and correcting the integrated output as a function of pressure variations to supply a corrected signal, parallel circuit means responsive to said pressure signals for detecting the maximum pressure and the minimum pressure, first subtracting means for obtaining an analogical signal proportional to the difference of said maximum and minimum pressures, and means for supplying the output of said first subtracting means to said computing and measuring means for correcting said integrated output.
Claim 3
Dependent Claim
78 words
A device according to claim 1, the computing and measuring means including second subtracting means for subtracting from the integrated signal obtained in the computing and measuring means, the analogical signal proportional to the difference of said maximum and minimum pressures, to thereby correct the measurement as a function of surplus gas volume corresponding to the volume difference of the gas contained in the respiratory system at extreme pressures, when said surplus gas is returned to atmospheric pressure.
Claim 4
Dependent Claim
38 words
A device as claimed in claim 2, wherein the first substracting means includes an inverter coupled to one of the parallel circuit means and summation means coupled to said inverter and the other of said parallel circuit means.
Claim 5
Dependent Claim
43 words
A device as claimed in claim 3, further including a potentiometric means interposed between said first and second subtracting means to permit adjustment of the pressure difference signal and render said difference signal proportional to the volume of the respiratory system being monitored.
Claim 6
Dependent Claim
107 words
A device according to claim 4, wherein said computing and measuring means includes first and second integrators disposed in parallel, the first of said integrators integrates over a given period, and the second of said integrators over a respiratory cycle, dectector means for resetting said second integrator to zero by the signal transmitted by the delivery pickup means, the two integrators being coupled to said second subtracting means, and a multiplier means for multiplying the said signal of the difference of the maximum and minimum pressures by the number of cycles during a given period and means for supplying the multiplied signal to the second subtracting means.
Claim 7
Dependent Claim
30 words
A device according to claim 5, further including means for deriving said number of cycles during said given period by counting the zero reset pulses transmitted by the detector means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |