Patent US4220162A successfully refreshed from Google Patents.
US4220162A
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Alveolar gas sampling system and method
Assignee: Intermountain Healthcare
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Filing: 1978-11-24
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Granted: 1980-09-02
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Expires: 1998-11-24
Abstract
Abstract An alveolar gas sampling system comprises a catheter adapted for placement in a patient's nostril or in an endotracheal tube and connected to a positive displacement pump through a three way valve. Signal means for detecting onset of inspiration and expiration is mounted at the tip of the catheter and connected to a controller. The positive displacement pump is driven by a reversible stepper motor actuated by the controller during the flow of alveolar air. When the desired amount of alveolar gas has been sampled, the stepper motor is reversed and the position of the valve is switched by the controller causing the alveolar gas collected in the positive displacement pump to be expelled for analysis.
Inventors
- 👤 Justin S. Clark
- 👤 Frederick L. Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:38
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/097; A61B5/083; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/497; G01N1/00; G01N1/02; G01N1/22; G01N1/24; G01N2001/247
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
In a system for sampling alveolar gas exhaled from a subject comprising a non-invasive catheter, signal means for detecting the inspiratory and expiratory phases of the respiratory cycle attached to one end of the catheter, controller means connected with the signal means and valve means located at the other end of the catheter said valve means also being signally connected to and operated by the controller the improvement which comprises (a) a reversible stepper motor connected to and operated by the controller and (b) a positive displacement pump having a pump chamber operated by said stepper motor and connected to said valve means such that alveolar gas may be directly drawn into the pump chamber of said positive displacement pump through said catheter and valve means when the stepper motor is operated in one direction by the controller and discharged from said positive displacement pump chamber through said valve means when the stepper motor is operated in the opposite direction by the controller.
Claim 2
Dependent Claim
163 words
In a system for sampling alveolar gas exhaled from a subject comprising a non-invasive catheter, signal means for detecting the inspiratory and expiratory phases of the respiratory cycle attached to one end of the catheter, controller means connected with the signal means and valve means located at the other end of the catheter said valve means also being signally connected to and operated by the controller the improvement which comprises (a) a reversible stepper motor connected to and operated by the controller and (b) a positive displacement pump having a pump chamber operated by said stepper motor and connected to said valve means such that alveolar gas may be directly drawn into the pump chamber of said positive displacement pump through said catheter and valve means when the stepper motor is operated in one direction by the controller and discharged from said positive displacement pump chamber through said valve means when the stepper motor is operated in the opposite direction by the controller.
Claim 3
Dependent Claim
73 words
In a method for the sampling of alveolar gas exhaled from the airway of a subject through a non-invasive catheter the improvement comprising directly drawing the exhaled alveolar gas through the catheter into the chamber of a positive displacement pump said pump being operated by a reversible stepper motor and discharging the gas collected in said pump chamber to gas collecting means by reversing the direction in which the stepper motor is operated.
Claim 4
Dependent Claim
73 words
In a method for the sampling of alveolar gas exhaled from the airway of a subject through a non-invasive catheter the improvement comprising directly drawing the exhaled alveolar gas through the catheter into the chamber of a positive displacement pump said pump being operated by a reversible stepper motor and discharging the gas collected in said pump chamber to gas collecting means by reversing the direction in which the stepper motor is operated.
Claim 5
Dependent Claim
28 words
A method according to claim 2 wherein the pump chamber of the positive displacement pump is interconnected to the non-invasive catheter and gas collecting means through a valve.
Claim 6
Dependent Claim
34 words
A method according to claim 3 wherein alveolar gas is drawn through the non-invasive catheter into the pump chamber over a plurality of respiratory cycles before the gas in the pump chamber is discharged.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |