SU150201A1 - Spirometer - Google Patents

Description

Dry portable spirometers are known, comprising a housing, an impeller, a gear transmission coupled to an arrow, and a new, rotary annular scale. In such spirometers, the impeller is out of direct air flow, and for actuation it must be the flow of exhaled breath from the support, which creates additional resistance to exhalation.

The proposed spirometer reduces the exhalation (inhalation) resistance, eliminates the formation of condensate inside the device during the passage of air, and makes it possible to measure the vital capacity of the lungs, reserve air and additional air in them.

Distinctive features of the spirometer are the placement of the impeller in the forward flow of air and the coaxial arrangement of the inlet and outlet openings of the instrument.

In order to improve accuracy, the device provides for the elimination of the inertial action of the impeller. This is ensured by the presence of a special spring-loaded lever for disengaging the worm gear from engagement.

The drawing shows a schematic diagram of the spirometer.

The spirometer consists of a housing 1, an impeller 2, a heart-shaped gear 3, a spring-loaded lever 4 on (off), a rotary ring 11 and 5 and an arrow 6 connected in a single system. During the expiration act, the impeller 2 installed in the air flow is driven into rotation, which through the worm gear and gear 3 is transmitted to the arrow 6, indicating on the scale 5 scaled per liter, the volume of exhaled air.

A spring-loaded lever 4, which turns off the worm bristle after the end of expiration, engages the inertial action of the rotating impeller 2 on the arrow readings. In order to install the tongues 6 on the zero division, it is made in the form of a ring, freely hovering on the instrument case. The scale is applied on the inner side of the ring.

To reduce the resistance to breathing and the appearance of condensation moisture on the internal parts of the device, the impeller 2 is placed in the forward air flow, and the inlet 7 and outlet 8 of the spirometer are located in the spirometer. The spirometer can work during inhalation and exhalation, in this case, in the first case, the vital capacity of the lungs is determined, in the second, the volume of residual and reserve air in the lungs. When working with the device, they first press the switching lever 4, protruding from the device body, with their finger, and the worm-and-gear transmission is engaged. Rotation set the arrows on the zero division. The instrument is then brought to the mouth and exhaled or inhaled. During exhalation (or inhalation), the impeller rotates, the arrow moves along the scale. Upon expiration (or inhalation), the lever is released and the arrow stops, fixing the readings of the instrument.

Subject invention

Claims (2)

1. A spirometer comprising a housing, an impeller, a worm gear, a rotary ring scale and an arrow, characterized in that, in order to make measurements of vital capacity of the lung, back-up and additional air in them with one device, to reduce the exhalation (inhalation) and the possibility of condensation inside the device, the impeller is placed in the forward flow of air, and the inlet and outlet openings are located coaxially. 2. A spirometer according to claim 1, characterized in that, in order to eliminate the inertial effect of the impeller on the readings of the device at the end of the exhalation (inhalation) act, the device provided: with a spring-loaded lever to disable the worm gear from engagement.