Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-04-30
1994-11-22
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
128716, 128722, G08B 2100
Patent
active
053672925
ABSTRACT:
The present invention is an apparatus for monitoring the flow of inspired and expired air. The apparatus includes a respiratory air tract and a piezoelectric sensor for sensing the pressure within the air tract relative to ambient pressure and generating a corresponding pressure signal. There can be alarm means in communication with the pressure sensor for indicating when flow within the air tract is inadequate. The present invention is also an apparatus for maintaining a breathing passage in the trachea of a patient. The apparatus has a tracheotomy tube for fitting into the trachea and a pressure sensor disposed such that the pressure of the air in the tracheotomy tube is sensed and produces a pressure signal corresponding to the air pressure in the tracheotomy tube. Preferably, there is also a capacitor disposed in the tracheotomy tube such that the capacitance of the capacitor corresponds to the percent occlusion of the tube by an obstruction. Alarm means are provided in communication with the pressure sensor and the capacitor which indicates when the tube is obstructed or when the air flow is inadequate.
REFERENCES:
patent: 3903876 (1975-09-01), Harris
patent: 4182344 (1980-01-01), Benson
patent: 4600855 (1986-07-01), Strachan
patent: 4784130 (1988-11-01), Kenyon et al.
patent: 4924872 (1990-05-01), Frank
Einhorn Robert K.
Krespi Yosef P.
Szoke Istvan
Einhorn Robert K.
Hofsass Jeffery A.
Krespi Yosef P.
Schwartz Ansel M.
Schwartz Ansel M.
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