Patent ID: 7964389
Filing Date: 2011-06-21
Classification: G01N

Abstract:
1. A quantitative sampler of pathogens in exhaled air for a general investigation of public health about the pathogens, comprising: an air inputting pipe for a sampled individual to blow exhaled air; a check valve unit having an air inputting end connected to the air inputting pipe, and an air outputting end; an aerosol filtering unit having a first opening connected to the air outputting end of the check valve unit, a second opening, and an aerosol filtering material disposed between the first opening and the second opening for collecting aerosol particles in the exhaled air; and an air flow meter having an air inputting channel connected to the second opening of the aerosol filtering unit, and an air outputting channel, wherein the air flow meter is used to measure if total accumulated volume of the exhaled air reaches a predetermined sampling volume; wherein the air outputting channel of the air flow meter is further connected to a flow limiting unit for controlling the sampling volume of the exhaled air; wherein the flow limiting unit is a hollow cylinder which comprises an air inputting opening, a chamber, a piston and an air outputting opening, wherein the air inputting opening is communicated with the air outputting channel of the air flow meter, the piston is received in the chamber and can be pushed by the exhaled air, and the air inputting opening and the air outputting opening are formed on two different sides of the chamber in relation to the piston; wherein the piston of the hollow cylinder is connected to a push rod which is extended out of the hollow cylinder for manually pushing the piston; wherein the hollow cylinder further comprises an adjusting rod which has a first end extended into the hollow cylinder and a second end extended out of the hollow cylinder for adjusting a maximum motion distance of the piston in the chamber, wherein the adjusting rod is a thread rod, and a wall portion of the hollow cylinder has a thread hole for screw-connecting to the adjusting rod; and wherein the push rod manually pushes the piston until the piston abuts against an inner wall of the chamber close to the air inputting opening, and the adjusting rod adjusts the maximum motion distance of the piston in the chamber, so as to set a fixed maximum capacity of the chamber for receiving the exhaled air; after the exhaled air of the sampled individual passes through the air flow meter and flows into the flow limiting unit, the exhaled air generates an air pressure to push the piston in the chamber, wherein air originally received in the chamber close to the air outputting opening is exhausted from the air outputting opening; once the piston moves to abut against the first end of the adjusting rod, a total accumulated volume of the exhaled air is equal to the fixed maximum capacity of the chamber, so that the piston can not be further pushed the exhaled air, and the sampled individual is thus reminded that the quantitative exhaling operation is finished; the flow limiting unit is detachable from the air outputting channel of the air flow meter, and the push rod can be manually pushed until the piston abuts against the inner wall of the chamber close to the air inputting opening again for another sampled individual to repeatedly use.