US4763664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas collector unit for measuring the metabolic variables of self-respiring patients
Assignee: Instrumentarium Oyj
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Filing: 1987-03-13
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Granted: 1988-08-16
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Expires: 2007-03-13
Abstract
Abstract A gas collector unit to be fitted over the head of a patient for measuring oxygen consumption, carbon dioxide output and respiratory quotient, said unit comprising a clear, substantially half-ellipsoidal plastic canopy (1), a cylinder of plastic sheeting (8), which is airtightly seamed to its edges and whose mouth (10) can be airtightly sealed around the neck of a patient, as well as hose couplings (2) and (3) and flow diffusers (6) and (7) associated therewith. The free volume of a canopy with a patient's head therein is less than a third of the amount air flowing through the canopy per minute and that the free cross-sectional area of a canopy perpendicular to flow is dimensioned in a manner that the average speed of air flow over the face is higher than 4 cm/s and the CO 2 -content of inhalation air is less than 0.2%.
Inventors
- 👤 Pekka Merilainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:40
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/097; A61B5/0806; A61M; A61M16/00; A61M16/06; A61M16/0605; A61M16/0627
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A gas collector unit to be fitted over the head of a patient for measuring oxygen consumption, carbon dioxide output and respiratory quotient, said unit comprising a clear, substantially half-ellipsoidal plastic canopy (1), a cylinder of plastic sheeting (8), which is seamed airtightly to its edges and whose mouth (10) can be sealed airtightly around the neck of a patient, as well as hose couplings (2) and (3) and flow diffusers (6) and (7) associated therewith, characterized in that the free volume of a canopy with a patient's head therein is less than a third of the amount of air flowing through the canopy per minute and that the free cross-sectional area of said canopy perpendicular to flow is dimensioned in a manner that the average speed of air flow over the face is higher than 4 cm/s and the CO 2 -content of inhalation air is less than 0.2%.
Claim 2
Dependent Claim
150 words
A gas collector unit to be fitted over the head of a patient for measuring oxygen consumption, carbon dioxide output and respiratory quotient, said unit comprising a clear, substantially half-ellipsoidal plastic canopy (1), a cylinder of plastic sheeting (8), which is seamed airtightly to its edges and whose mouth (10) can be sealed airtightly around the neck of a patient, as well as hose couplings (2) and (3) and flow diffusers (6) and (7) associated therewith, characterized in that the free volume of a canopy with a patient's head therein is less than a third of the amount of air flowing through the canopy per minute and that the free cross-sectional area of said canopy perpendicular to flow is dimensioned in a manner that the average speed of air flow over the face is higher than 4 cm/s and the CO 2 -content of inhalation air is less than 0.2%.
Claim 3
Dependent Claim
30 words
A gas collector unit as set forth in claim 1, characterized in that the edges of plastic canopy (1) is provided with an open skirt of plastic sheeting seamed thereto.
Claim 4
Dependent Claim
53 words
An apparatus, comprising a gas collector unit as set forth in claim 1, a constant flow aspirator, CO 2 - and O 2 -sensors and calculator units, intended for measuring metabolic variables, characterized in that gas measurements are effected from gas signals, varying non-uniformly along with respiration and diluted by a constant flow.
Claim 5
Dependent Claim
20 words
The application of an apparatus as set forth in claim 1, for measuring the metabolic variables of a self-respiring patient.
Claim 6
Dependent Claim
16 words
The application of an apparatus as set forth in claim 1, for physiological stress test measurements.
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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |