Pressure relief valve
OwnerGerald E. McGinnisinventor
Life of this patent
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Abstract
An inhalation/exhalation valve for use in conjunction with a medical respiration apparatus to maintain an adjustable positive end expiration pressure through incorporation of novel valving elements including a novel, adjustable spring for establishing and maintaining the threshhold pressure of exhalation and a novel flow control valve disk structure which utilizes the dynamic pressure of exhalation flow to assist in providing control over and fine adjustability of the valve disk motion and which further permits continuous supply flow during both the inhalation and exhalation portions of the patient's breathing cycle.
Claims8
In a valve for controlling medical gas delivery to a patient and for providing a threshold resistance for positive end expiratory pressure therapy for such
- pressure valve for administering positive end expiratory pressure therapy to a patient by providing a threshold resistor which includes a valve element that is biased toward a closed position by a variable bias to provide threshold resistance which prevents exhalation flow from such a patient until such threshold resistance is overcome, the improvement comprising:
- a spring bias means for biasing the valve element toward the closed position with said spring bias means comprising a conically formed coil spring having varying coil density with the maximum coil density adjacent the larger diameter end thereof and a minimum coil density adjacent the smaller diameter end thereof.
In a positive end expiratory pressure valve for administering positive end expiratory pressure therapy to a patient by providing a threshold resistor which includes a valve element that is biased toward a closed position by a variable bias to provide threshold resistance which prevents exhalation flow from such a patient until such threshold resistance is overcome, the improvement comprising:
- a spring bias means for biasing the valve element toward the closed position with said spring bias means comprising a conically formed coil spring having varying coil density with the maximum coil density adjacent the larger diameter end thereof and a minimum coil density adjacent the smaller diameter end thereof.
Dependencies are inferred from the claim text.