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US 11,890,089 B1Granted
Flowmeter for airway resistance measurements
AssigneeThorasys Thoracic Medical Systems Inc.
InventorOleg Grudin
Life of this patent
Estimating the term…
Abstract
A flowmeter has a disposable flow tube and a part of the shutter which are in direct contact with exhaled air and protect the rest of the device from potential contamination with harmful viruses.
Claims8
A device for measuring airway resistance comprising:
- a shutter;
- a flow tube having a proximal end, for engaging a patient's mouth, a distal end, for receiving said shutter to releasably occlude said flow tube, and a medial pneumatic port;
- a baffle located upstream of said pneumatic port, said baffle projecting from a sidewall near said pneumatic port so as to create a negative pressure at said pneumatic port;
- a sensor for measuring pressure in said flow tube during occlusion and entrainment pressure caused by air flow through the tube during exhalation, wherein said sensor is in communication with said pneumatic port;
- and
- a shutter release mechanism to keep said flow tube closed with said shutter during occlusion and to release said shutter at the end of occlusion.
3 more elements
A device for measuring airway resistance comprising:
- a shutter;
- a flow tube having a proximal end, for engaging a patient's mouth, a distal end, for receiving said shutter to releasably occlude said flow tube, and a medial pneumatic port;
- a baffle located upstream of said pneumatic port, said baffle projecting from a sidewall near said pneumatic port so as to create a negative pressure at said pneumatic port;
- a sensor for measuring pressure in said flow tube during occlusion and entrainment pressure caused by air flow through the tube during exhalation, wherein said sensor is in communication with said pneumatic port;
- and
- a shutter release mechanism to keep said flow tube closed with said shutter during occlusion and to release said shutter at the end of occlusion,
- wherein said baffle has a shape dependent on flow tube geometry and the shape is further dependent on modifying an output of a combination of pressure value, pressure noise, and nonlinearity of pressure response versus flow.
4 more elements
Dependencies are inferred from the claim text.