Shwaas is a Bluetooth-enabled spirometer brings together the ease of use of a handheld spirometer with the data logging capabilities of an Android smartphone.
Shwaas is palm-sized device with a built-in LCD display for immediate access to test data.
Flow and volume related parameters are measured and transmitted to any Android smartphone via a built-in Bluetooth module. The Shwaas app allows data download in PDF and CSV (excel-readable) formats.
The device measures exhaled (expiratory) air flow using a rotary turbine. The number of rotations of the turbine is proportional to the volume of air, and the frequency of rotation is proportional to the flow rate. Based on these principles, infrared (IR) sensors are used to translate movement of the turbines to flow rate and air volume.
Shwaas assesses all major flow and volume related respiratory parameters, as described in the following section.
Forced Vital Capacity - the volume of air that can forcibly be blown out after full inspiration.
Forced Expiratory Volume - the volume of air that can forcibly be blown out in one second after full inspiration.
The ratio of FEV1 to FVC, expressed in percentage.
PEF, or Peak Expiratory Flow, represents the maxima on flow-volume curve, i.e. the highest flow rate.
FEF25 is flow rate at 25% of vital capacity (FEV)
FEF75 is the flow rate at 25% of vital capacity (FEV)
FEF2775 is the average flow rate between 25% and 75% of the vital capacity
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