METHOD OF FORMING REQUIRED CONCENTRATION OF ANAESTHETICS IN EVAPORATORS OF ANAESTHETIC APPARATUSES IN CARRYING OUT LOW-FLOW ANAESTHESIA AND DEVICE FOR ITS REALISATION

摘要

FIELD: medicine.;SUBSTANCE: claimed is a device for the formation of a required concentration of liquid anaesthetics in anaesthetic apparatuses, containing a mixing-and-evaporating chamber, a reservoir for a liquid anaesthetic, connected by a hydraulic main line with the mixing-and-evaporating chamber by means of a shutoff-and-pass valve and a jet. The shutoff-and-pass valve is electrically connected to a command-and-control electronic unit. The device also contains a microcompressor of the pressure boost of air into the said reservoir and a sensor of pressure control in the reservoir for the liquid anaesthetic. Claimed is a method for the formation of a required concentration of anaesthetics in evaporators of anaesthetic apparatuses in carrying out low-flow anaesthesia, in which the injection of a liquid anaesthetic is realised by a doser of anaesthetics directly into the breathing gas flow. Injection is realised by discrete single doses. The volume of a discrete single dose of injection is set by the ratio: where V_p is the volume of a discrete single dose of the liquid anaesthetic, supplied in each injection; Q_a is the estimated total flow of the liquid anaesthetic, injected per the time unit, required for the provision of a specified concentration of anaesthetic vapours in the breathing mixture; F_max is the frequency of the discrete doses of injections per the time unit, which is technically maximally achievable by the doser of anaesthetics.;EFFECT: inventions provide the accuracy of dosing the vapours of liquid anaesthetics in the wide range of changes of their concentrations and flows of the carrier-gas in carrying out low-flow anaesthesia.;2 cl, 1 dwg