Background technology
Exhale and detect at present as an emerging medical diagnosis technology, widely use clinical.Such as characteristics of contaminated respiratory droplets nitric oxide is the important symbol thing of airway inflammation,14cO2be the mark etc. of gastric ulcer, detect professional of exhaling is being just the quick of mankind's medical diagnosis and treat with accuracy, convenient, and safety plays further important effect.The expired gas of human body mainly contains part in the air of human endogenous's property gas and suction and remains in the gas composition in human body.
Because human endogenous's property gas molecule content for the gas molecule in air is extremely low, the breath having influence on our reality detects by the gas content remained in the air therefore sucked in human body.In order to head it off, improve expiration detection accuracy, to exhaled NO test, ATS/ERS Organisation recommendations " should be installed NO filter or allow detected person suck not containing the gas of NO " on detecting instrument.A kind of scrubber is disclosed in CN1688251A, comprise at least one inlet hole and the first outlet opening and comprise filtering material, second outlet opening arrange in the housing with the first outlet opening and any inlet hole position spaced apart, to the filtration of NO in the air flowing through this scrubber, but this device is placed in instrument internal, during life-time service, change more loaded down with trivial details, also only NO in suction gas is filtered, expired gas is not filtered.
The saliva, the spittle, food debris, pathogen etc. of experimenter when exhaling all can spray, adhere to and be deposited in detector pipeline loop, pollute, these pipelines can not clean thoroughly when each testee uses, sterilize, very easily cause cross infection, CN203075786U discloses a kind of breath device, comprise lower casing and between filter membrane, upper casing connects lower casing of being difficult to articulate and connects tool interface system, and filter membrane can saliva, the spittle, food debris, antibacterial etc. in active adsorption expired gas.
In order to the filtration of respiratory being unified on a device, the suction filter of prior art is made up of a threeway and a filter box, air-flow trend when controlling air-breathing by two umbellate form valves and exhale, but this structure has following shortcoming: expiration and air-breathing have shared one section of body, these pipelines can not clean thoroughly when each testee uses, sterilize, and very easily cause cross infection; Filter box is exposed to the outside, well can not ensure life-span of filtering material; Three-port structure is difficult to accomplish good grip feeling hand-held; Suction filter of the prior art can only be used for mouth and exhale, and can not connect airbag also cannot as zero reference.
Summary of the invention
The present invention is directed to above problem and the improvement of the inhale filter device proposed, make air-breathing and exhale respectively have one section of independently path, prevent cross infection, filter box is placed on inside and improves service life, upper lower casing design dismounting and change can filter box, and upper lower casing is combined into a set of tubular structure, facilitate hand-held, adding of contact pin can connect airbag, and the opening part of upper casing can seal with an airtight upper cover, thus carries out the detection of air zero reference value.
The present invention relates to a kind of hand-held inhale filter device, comprise: the filter box (2) of upper casing (1), lower casing (4) and centre and filter box (3), wherein an opening (6) is arranged at the bottom of lower casing (4), upper casing (1) front end comprises the contact pin (9) of a cavity (10) and, has two check valves (7) and (8) in device.
Described device can be divided into intake channel and air outlet passage, and wherein intake channel is made up of the opening (6) of lower casing (4), filter box (2), check valve (8) and cavity (10); Air outlet passage is made up of contact pin (9), filter box (3), check valve (7) and pipeline (5), check valve (8) is placed in the rear end of filter box (2), check valve (7) is placed in the rear end of filter box (3), by check valve (8) and check valve (7) by intake channel and air outlet passage independent of one another, this is when breath tester, the pipeline that expiration and air-breathing do not share, prevents cross infection.
Upper casing (1) cavity (10) with the consistent size of being difficult to articulate being connected oral cavity, be set as standard size 22mm, contact pin (9) can connect airbag, customized according to airbag size, is less than or equal to 12mm.
Filter box (2) in described hand-held inhale filter device for filtering the component to be measured in suction gas, when carrying out expiration nitric oxide test, the filtering material potassium permanganate that is potassium permanganate or is combined with appropriate level carbon of filter box (2); Filter box (3) is for saliva, the spittle, food debris, antibacterial in filtering exhalation, and its filtering material is polymeric fibrous material, desiccant and medical adhesive-bonded fabric.
Upper casing (1) and lower casing (4) are fastened and connected or are threaded, and after upper casing (1) and lower casing (4) are opened, filter box (2) wherein and filter box (3) can dismounting and change.Upper casing (1) is combined into sleeve-shaped integral structure after being connected with lower casing (4), facilitates hand-held, filter box is enclosed in device inside simultaneously, extends its service life.
When using described device to carry out air-breathing, air-flow enters from the bottom opening (6) of lower casing (4), what box (2), check valve (8) and upper casing front end (10) connect after filtration is difficult to articulate, suck human body, during expiration, air-flow enters filter box (3) from contact pin (9) and enters test instrunment by the pipeline (5) of check valve (7) and connecting test instrument again, air suction way and exhalation path independently of one another, can not interfere with each other.
The opening part of upper casing (1) can be closed with sealing upper cover (11), ambient atmos movement locus is in a device U-shaped, charge air flow enters from the bottom opening (6) of lower casing (4), box (2), check valve (8) and upper casing front end (10) place after filtration, the contact pin (9) gone out in the middle of entraining air stream the past end (10) enters filter box (3) and enters test instrunment by the pipeline (5) of check valve (7) and connecting test instrument again, and the gas now entered in instrument is the zero reference air-flow having filtered component to be measured in air.
The invention solves when exhaling detection, the interference of component to be measured in surrounding air during air-breathing, the interference of other impurity in breath during expiration, and improve on the basis realizing this function, make air-breathing and exhale respectively have one section of independently path, prevent cross infection.
Structure of the present invention is simple, and the design of upper lower casing makes it dismounting and change can filter box, and extend service life, they are combined into a set of tubular structure, facilitate hand-held, easily manufactured, are easy to promotion and implementation, during life-time service.
In the present invention, adding of contact pin makes this device directly can connect airbag, and the opening part of its upper casing can seal with an airtight upper cover, thus directly can carry out the detection of air zero reference value.
Specific embodiment
Fig. 1 show schematically show the section of inhale filter device, device is made up of the filter box (2) of upper casing (1), lower casing (4) and centre and filter box (3), air suction way comprises a check valve (8), exhalation path comprises a check valve (7), and the preamble part of the upper casing (1) of device comprises the contact pin (9) that the cavity (10) of being difficult to articulate that can connect oral cavity and can connect airbag.
Embodiment one
When utilizing this device to carry out air-breathing, air-flow enters from the bottom opening (6) of lower casing (4), box (2) after filtration, what check valve (8) and upper casing front end (10) connect is difficult to articulate, after in air, nitric oxide is filtered by the potassium permanganate filtered in box (2), human body is inhaled into without nitric oxide production air, when exhaling, expired gas air-flow enters filter box (3) again by check valve (7) from contact pin (9), saliva now in expired gas, the spittle, remaining expectorant, food debris, after antibacterials etc. are filtered by filter box (3), test instrunment is entered by the pipeline (5) of connecting test instrument.
Embodiment two
This device is utilized to carry out zero with reference to when testing, the opening part of upper casing (1) can be closed with sealing upper cover (11), ambient atmos movement locus is in a device U-shaped, charge air flow enters from the bottom opening (6) of lower casing (4), box (2) after filtration, check valve (8) and upper casing front end (10) place, the contact pin (9) gone out in the middle of entraining air stream the past end (10) enters filter box (3) and enters test instrunment by the pipeline (5) of check valve (7) and connecting test instrument again, the gas now entered in instrument is filtered zero of component to be measured in air with reference to air-flow.
The invention is not restricted to the embodiment showing and describe, but any changes and improvements are all in the protection domain of appended claims.