Combi-valve for a blower driven ventilator

摘要

A valve assembly for a blower driven ventilator has a first conduit (1), an inlet (2) for receiving fluid from the blower (209) and a first orifice (4). A second conduit (5) is provided with an outlet (6) for forwarding fluid to a patient (203). A membrane (8) includes a front side (9) and a back side (10), wherein at least part of the membrane (8) is movable between a closed position and an open position. A switching circuit (12) enables the selective opening and closing of a fluid connection between the cavity (11) and the blower (209) via the fluid inlet (2), a fluid connection between the cavity (11) and the patient (203) via the fluid outlet (6), and a fluid connection between the cavity (11) and ambient air (13). A control system (17) controls the switching circuit (12) during a ventilation operation of the blower (209).

主权项

1. A valve assembly for a blower driven ventilator, the valve assembly comprising:
a first conduit comprising a fluid inlet for receiving fluid from a blower of the blower driven ventilator and a first orifice; a second conduit comprising a patient fluid outlet for forwarding fluid to a patient; a membrane valve operable in different operation modes, the membrane valve comprising a cavity and a membrane comprising a front side and a back side, wherein the back side forms at least part of a boundary of the cavity, wherein at least part of the membrane is movable, in response to a difference in pressure on the front side and the back side of the membrane, between a closed position in which the membrane prevents passage of fluid between the first conduit and the second conduit and an open position in which the membrane allows passage of fluid between the first conduit and the second conduit; a switching circuit having a plurality of switching states to change the operation modes of the membrane valve; a fluid connection between the switching circuit and the cavity; a fluid connection between the switching circuit and the blower via the fluid inlet; a fluid connection between the switching circuit and the patient via the fluid outlet; and a fluid connection between the switching circuit and ambient air, the switching circuit enabling a selective opening and closing of a fluid connection between the cavity and the blower via the fluid inlet to switch the membrane valve to a blower pressure operation mode with the fluid connection between the cavity and the fluid inlet open, enabling a selective opening and closing of a fluid connection between the cavity and the patient via the fluid outlet to switch the membrane valve to a patient outlet pressure operation mode with the fluid connection between the cavity and the patient fluid outlet open, and enabling a selective opening and closing of a fluid connection between the cavity and ambient air to switch the membrane valve to an ambient air pressure operation mode with the fluid connection between the cavity and ambient air open.