Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1983-06-24
1985-07-09
Recla, Henry J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, 12820519, 128910, A61M 1600
Patent
active
045275580
ABSTRACT:
A gas scavenger system is disclosed for use particularly with anesthetic administering equipment utilizing a demand valve for providing anesthetic gas to the patient. The gas scavenger system includes a collection manifold that collects the waste gases as they leave the normal exhaust ports of the demand valve. A flexible tubing means then carries those collected gases to a surge chamber prior to eventual discharge into a vacuum system. The surge chamber provides an interface between the vacuum system and the collection manifold and is connected to the vacuum system through a predetermined sized orifice which limits the flow to the vacuum system to a maximum known flow. The surge chamber normally allows continuous flow through the orifice to the vacuum system but is sized to accumulate an excess of flow from the collection manifold under abnormal conditions such as is occasioned when a patient coughs to allow time to remove the gases through the orifice and thus to prevent leakage to atmosphere. The surge chamber itself is directly connected to ambient through a known, fixed resistance of hydrophobic material such that an excess in pressure in the surge chamber above a maximum amount that determined by the known, fixed resistance is bled to atmosphere. Thus, in the event of an occlusion in the vacuum line, the patient is always assured a path for exhalation. Also, in the event the vacuum system draws gas at a faster flow rate than that of waste gases entering the surge chamber from the collection manifold, gas will be drawn from the ambient through the known, fixed resistance.
REFERENCES:
patent: 3721239 (1973-03-01), Myers
patent: 4188946 (1980-02-01), Watson et al.
patent: 4265239 (1981-05-01), Fischer, Jr. et al.
patent: 4291689 (1981-09-01), Hay
patent: 4312339 (1982-01-01), Thompson, Sr.
Cassett Larry R.
Rathbun Roger M.
Recla Henry J.
The BOC Group Inc.
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