US3713440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration system
Assignee: Individual
•
Filing: 1971-01-18
•
Granted: 1973-01-30
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Expires: 1991-01-18
Abstract
Abstract A filtration system, including apparatus and method for conventional anesthesia or respiratory therapy apparatus, the filtration system having tubular filters formed of fibrous material interposed in both the inspiratory and expiratory tubes. If either of the filters is directed counter to the flow of gas in the inspiratory or expiratory tubes, an internal support member may be used to maintain the inflated configuration of the filter. Attachment structure is provided to couple the filters to the anesthesia apparatus and to accommodate aseptic removal of the filters from the anesthesia apparatus.
Inventors
- 👤 P Nicholes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/104; A61M16/105; A61M16/1055; A62; A62B; A62B19/00; A61M16/08; A61M16/0816; A61M16/0833
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
Gas delivery apparatus comprising a source of gas; inspiratory conduit means for conducting gas from the source to a patient; one-way valve means in the conduit causing one-way displacement of gas to the patient; expiratory conduit means for conducting exhalant from the patient; and a face mask coupling, the improvement comprising: two elongated tubular filters each having one closed end which, along with a substantial portion of the length of the filter, is disposed within each of the inspiratory and expiratory conduits, each filter being generally concentric with at least part of the length of its corresponding inspiratory or expiratory conduit; and means aseptically sealing each filter adjacent an end of the corresponding conduit proximate the face mask coupling to isolate the gas delivery apparatus from the patient.
Claim 2
Dependent Claim
128 words
Gas delivery apparatus comprising a source of gas; inspiratory conduit means for conducting gas from the source to a patient; one-way valve means in the conduit causing one-way displacement of gas to the patient; expiratory conduit means for conducting exhalant from the patient; and a face mask coupling, the improvement comprising: two elongated tubular filters each having one closed end which, along with a substantial portion of the length of the filter, is disposed within each of the inspiratory and expiratory conduits, each filter being generally concentric with at least part of the length of its corresponding inspiratory or expiratory conduit; and means aseptically sealing each filter adjacent an end of the corresponding conduit proximate the face mask coupling to isolate the gas delivery apparatus from the patient.
Claim 3
Dependent Claim
128 words
Gas delivery apparatus comprising a source of gas; inspiratory conduit means for conducting gas from the source to a patient; one-way valve means in the conduit causing one-way displacement of gas to the patient; expiratory conduit means for conducting exhalant from the patient; and a face mask coupling, the improvement comprising: two elongated tubular filters each having one closed end which, along with a substantial portion of the length of the filter, is disposed within each of the inspiratory and expiratory conduits, each filter being generally concentric with at least part of the length of its corresponding inspiratory or expiratory conduit; and means aseptically sealing each filter adjacent an end of the corresponding conduit proximate the face mask coupling to isolate the gas delivery apparatus from the patient.
Claim 4
Dependent Claim
128 words
Gas delivery apparatus comprising a source of gas; inspiratory conduit means for conducting gas from the source to a patient; one-way valve means in the conduit causing one-way displacement of gas to the patient; expiratory conduit means for conducting exhalant from the patient; and a face mask coupling, the improvement comprising: two elongated tubular filters each having one closed end which, along with a substantial portion of the length of the filter, is disposed within each of the inspiratory and expiratory conduits, each filter being generally concentric with at least part of the length of its corresponding inspiratory or expiratory conduit; and means aseptically sealing each filter adjacent an end of the corresponding conduit proximate the face mask coupling to isolate the gas delivery apparatus from the patient.
Claim 5
Dependent Claim
23 words
Apparatus as defined in claim 1 wherein each of said tubular filters is formed of fibrous material comprising paper mat and glass fibers.
Claim 6
Dependent Claim
33 words
Apparatus as defined in claim 1 wherein at least one of said filters comprises support structure for maintaining the filter in tubular configuration even when exposed to a pressure differential across the filter.
Claim 7
Dependent Claim
28 words
Apparatus as defined in claim 1 wherein boTh filters open toward the patient and isolate the entire internal surfaces of the inspiratory and expiratory tubes from the patient.
Claim 8
Dependent Claim
16 words
Apparatus as defined in claim 1 wherein at least one filter opens away from the patient.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |