Low Cost Spirometer Survey
CHAPTER 2 LITERATURE SURVEY 2.1 SURVEY CONDUCTED For our project which is fabrication of a Low – cost spirometer we had done some research. This research involved conducting a survey at M.S.Ramaiah Hospital. We visited the hospital to meet with a few pulmonologists. We visited Dr. Krishnaiah who showed us how a spirometer was used for detecting asthma, COPD, and other respiratory ailments. She showed how the graph is plotted, for both with and without respiratory ailments. Next we visited Dr. Pallavi who told us about the limitations of conducting the respiratory tests and also the cost related problems which accompany such tests. Our project is aimed at not only fabricating the spirometer but also overcoming these limitations, especially …show more content…
Spirometer having a housing with an elongated flow chamber open at one end, a pressure sensing end opposite the open end and an outlet passageway intercepting the flow chamber at an angle and proximate the pressure sensing end. A differential pressure sensor is coupled to the pressure sensing end from a port at an angle to an axis of the flow chamber. The angle is substantially greater than 0° but substantially less than 180° while the angle • may take any value between 90° and 180°.Preferably, the differential pressure sensor is coupled to the pressure sensor by a meander passageway through which only diffusion of air takes place and whose length divided by the speed of sound is less than the measuring rate of the differential pressure sensor.The meander passageway is bent to inhibit contaminants blown into the flow chamber from reaching the differential pressure sensor. A rigid meander passageway is advantageous to prevent errors in the signal due to passageway flexing or motion. This air pressure rise can be measured with a single pressure sensor that is connected to the spirometer. The flow outlet, and pressure sensor are positioned at angles to the flow such that the increase in pressure measured by the sensor is optimized. This novel feature can enhance the change in differential pressure measured by the sensor by an order of magnitude over prior art spirometers, increasing accuracy
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