Gas Blending Apparatus and Gas Delivery System with such a Gas Blending Apparatus

A gas delivery system for providing gas to an individual, the gas delivery system comprising:

• a donor reservoir adapted to retain gas wherein the donor reservoir has a fully inflated condition;
• a supply valve in fluidic association with the donor reservoir, the supply valve with an open condition wherein gas is allowed to flow into the donor reservoir and a closed condition wherein gas is not allowed to flow into the donor reservoir;
• an inflation detection system operative to detect when the donor reservoir is inflated to within a predetermined range of the fully inflated condition, wherein the inflation detection system detects a first condition when the donor reservoir is inflated to within the predetermined range of the fully inflated condition, wherein the inflation detection system detects a second condition when the donor reservoir is inflated below the predetermined range of the fully inflated condition, and wherein the inflation detection system is operative to actuate the supply valve to the open condition when the donor reservoir is inflated below the predetermined range of the fully inflated condition;
• a gas blending apparatus comprising:
• a main conduit body with an inner volume, a first port for being disposed in fluidic communication with the donor reservoir, and a second port for supplying gas to the recipient;
• a one-way inspiratory valve disposed within the main conduit body between the first port and the second port wherein the one-way inspiratory valve is operative to permit gas to be drawn in from the donor reservoir through the first port and passed through the second port to the recipient and wherein the one-way inspiratory valve is operative to prevent gas from received through the second port from passing through the first port into the donor reservoir;
• an air-input orifice in the main conduit body distal to the one-way inspiratory valve with respect to the first port, wherein the air-input orifice is operative to provide an aperture into the inner volume of the main conduit body with an effective size to permit the entrance of ambient air into inner volume of the gas blending apparatus;
• whereby ambient air can be drawn into the main conduit body through the air-input orifice and blended with gas drawn from the donor reservoir in a ratio of ambient air to gas drawn from the donor reservoir.