Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1995-03-17
1997-05-27
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
12820419, 1374932, 1375122, 137599, 137908, 251 65, A61M 1600
Patent
active
056322984
ABSTRACT:
A resuscitation and inhalation device which can be used alternatively in each of two modes. The flow of oxygen or gas is controlled by a control valve, itself controlled by a movable member acted upon by the pressure of oxygen or gas in a chamber after having flowed passed the control valve. On meeting a preset maximum pressure, the valve member moves to close the control valve. The movable valve member is acted upon by a magnetic field which is adjustable, and the magnetic field strength sets the pressure at which the valve member moves. Oxygen or gas is admitted to the control valve by two alternative inlet valves, one for resuscitation with only oxygen or gas flowing through the mask, and one for inhalation, with oxygen or gas and air or a second gas being fed through the mask, allowing ambient air to mix prior to the flow to the patient as a result of inhalation effort by the patient.
REFERENCES:
patent: 2865531 (1958-12-01), Gorst et al.
patent: 3459216 (1969-08-01), Bloom et al.
patent: 3515163 (1970-06-01), Freeman
patent: 4121580 (1978-10-01), Fabish
patent: 5230330 (1993-07-01), Price
patent: 5398714 (1995-03-01), Price
Hepperle Stephen M.
Sharpe Paul
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