PUMP AND EXHALATION VALVE CONTROL FOR RESPIRATOR APPARATUS
First Claim
1. Double acting respirator pump apparatus comprising a housing defining two pump chambers and a pump member reciprocable with respect to said pump chambers and configured to provide an inlet stroke and an outlet stroke with respect to each said chamber in each reciprocation cycle of said pump member, wherein said inlet stroke and said outlet stroke for each pump chamber defines for the respective pump chamber a displacement volume that is displaced in the respective pump chamber by reciprocation of the pump member in one reciprocation cycle between the respective inlet stroke and the respective outlet stroke, and wherein a volume of at least one said pump chamber at the end of the respective said output stroke thereof is a first proportion of the respective said displacement volume, wherein said first proportion is not less than about 50%, and wherein said pump member comprises a piston reciprocably mounted with respect to said pump chambers via a rolling convolution diaphragm peripherally joined to the piston and anchored with respect to each said pump chamber, and wherein said diaphragm is configured for avoiding being collapsed during the output stroke of each said pump chamber.
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Accused Products
Abstract
Double acting respirator pump apparatus including a pump member reciprocable with respect to two pump chambers to deliver air to a patient via a respirator exhalation system, which also facilitates exhalation of the patient. The exhalation system has a pump unit that is operatively connected to an exhalation valve member and configured for selectively generating an air pressure sufficient for pressurizing one side of the valve member for closing the same when said exhalation system is operating in inhalation mode, and may be operated for opening to allow the patient to exhale therethrough.
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Citations
23 Claims
- 1. Double acting respirator pump apparatus comprising a housing defining two pump chambers and a pump member reciprocable with respect to said pump chambers and configured to provide an inlet stroke and an outlet stroke with respect to each said chamber in each reciprocation cycle of said pump member, wherein said inlet stroke and said outlet stroke for each pump chamber defines for the respective pump chamber a displacement volume that is displaced in the respective pump chamber by reciprocation of the pump member in one reciprocation cycle between the respective inlet stroke and the respective outlet stroke, and wherein a volume of at least one said pump chamber at the end of the respective said output stroke thereof is a first proportion of the respective said displacement volume, wherein said first proportion is not less than about 50%, and wherein said pump member comprises a piston reciprocably mounted with respect to said pump chambers via a rolling convolution diaphragm peripherally joined to the piston and anchored with respect to each said pump chamber, and wherein said diaphragm is configured for avoiding being collapsed during the output stroke of each said pump chamber.
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13. Double acting respirator pump apparatus comprising a housing defining two pump chambers and a pump member reciprocable with respect to said pump chambers and configured to provide an inlet stroke and an outlet stroke with respect to each said chamber in each reciprocation cycle of said pump member, wherein said inlet stroke and said outlet stroke for each pump chamber defines for the respective pump chamber a displacement volume that is displaced in the respective pump chamber by reciprocation of the pump member in one reciprocation cycle between the respective inlet stroke and the respective outlet stroke, and wherein a volume of at least one said pump chamber at the end of the respective said output stroke thereof is a first proportion of the respective said displacement volume, wherein said first proportion is not less than about 50%, and wherein said pump member comprises a piston reciprocably mounted with respect to said pump chambers, wherein said piston has a axial translation in a reciprocation direction of said piston between a top dead center position corresponding to an end of an output stroke of one said pump chamber, and a bottom dead center position corresponding to an end of an output stroke of the other said pump chamber, wherein said axial translation is between about 10% and about 20% of a diameter of said piston as projected in a direction substantially orthogonal to said reciprocation direction.
- 14. Respirator exhalation system for facilitating exhalation of a patient connected to a respiratory apparatus, comprising an exhalation valve and a pump unit that is operatively connected to said exhalation valve and configured for selectively generating an air pressure sufficient for pressurizing one side of said valve member for closing the same when said exhalation system is operating in inhalation mode.
Specification