APPARATUS FOR MEASURING RESPIRATORY MINUTE VOLUME, CONTENT OF GASES IN EXHALED AND ALVEOLAR AIR OF HUMAN LUNGS Russian patent published in 2025 - IPC A61B5/08 A61B5/93 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to apparatus for measuring respiratory minute volume, gas content in exhaled and alveolar air of human lungs. Apparatus comprises a rubber respiratory mask combining oral and nasal cavities, having inhalation valves and an exhalation valve with a branch pipe containing a union, which connects the branch pipe of the exhalation valve with the cavity of the sealed bag located on the union, a sealed polyethylene bag with an inlet hole made of a tube, made with the possibility of inserting a detachable sensor of the gas analyser, for measuring content of gases in expired air. On the union, with a protrusion beyond the union end, a support with a ring exceeding the diameter of the union is fixed, and the ratio of the outer diameter of the union to the inner diameter of the tube ensures tightness of the joint of their surfaces, with such resistance to sliding of the inner surface of the tube relative to the outer surface of the union, which does not prevent the tube from sliding off the union when the sealed bag is completely filled with exhaled air, which is accompanied by its repulsion from the support. Exhalation valve branch pipe has an opening located at the face part of the respiratory mask with a first additional union extending from it, ending with a long rubber tube, and at the beginning of the first additional union there is a hole, from which the second additional union with a short rubber tube is located and extends beyond the end of the second additional union and made with possibility of inserting a detachable sensor of a gas analyser for measuring content of gases in alveolar air. Holes of the rubber tubes of the first and second additional unions and the hole of the union connected by the branch pipe of the exhalation valve to the cavity of the sealed bag located on the union have detachable plugs to control the direction of movement of exhaled air.

EFFECT: wider range and technical characteristics, diagnostic capabilities of the most accessible and stable working in hazardous and hazardous environmental conditions of measuring devices intended for research of the human respiratory system.

1 cl, 1 dwg, 1 tbl