ANAESTESIOLOGICAL CIRCUIT WITH BACKWARD INSPIRATION WITH INJECTOR OF VOLATILE ANAESTETIC AGENTS

摘要

An improved anaesthetical circuit with reverse inhalation is equipped with an injector of escaped anaesthetics connected by an inlet pipe to a valve in which a feeding pipe, leading from a source of constant flow, discharges a signal from a differential pressure indicator, being led into the valve through a conduit. The differential pressure indicator is fed from an energy source, on one hand, together with a conduit pipe leading from a drive pipe into the pressurized chamber of the differential pressure indicator, and a pipe leading from a connection pipe into the vacuum chamber of the differential pressure indicator, on the other hand. A connection pipe connecting an outlet pipe of the injector through a check valve with a rubber bag, which is arranged in a cylinder attached to the anaesthetical circuit. A drive pipe leading into the cylinder, containing the rubber bag and a pipe, leading from the drive pipe, leads into a control chamber of an expiration valve, the outlet pipe of which leads into a distribution valve. The distribution valve has two branches, one branch of it forming an exhaust system provided by a check valve leading out from the anaesthetical circuit, and the second branch of the distributor valve forming a runback pipe which is equipped with a pressurized valve which is connected through a carbon dioxide absorber and through a check valve to the connection pipe leading into the vacuum chamber.