CN208447594U - It can prevent the flow sensor for lung function tests of cross-infection - Google Patents
It can prevent the flow sensor for lung function tests of cross-infection Download PDFInfo
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- CN208447594U CN208447594U CN201721034523.3U CN201721034523U CN208447594U CN 208447594 U CN208447594 U CN 208447594U CN 201721034523 U CN201721034523 U CN 201721034523U CN 208447594 U CN208447594 U CN 208447594U
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Abstract
The utility model provides a kind of flow sensor for lung function tests that can prevent cross-infection, for hollow tubular structure, including main channel and set on the pressure port of main channel tube wall, main channel outer wall is equipped with the pressure hole post communicated with pressure port gas, the volume size of the pressure hole post internal cavities meets the following conditions: during pulmonary function detection, the gas of tester's exhalation or sucking enters pressure hole post by pressure port, and is maintained in pressure hole post without touching the connecting line other than flow sensor.Flow sensor described in the utility model can isolate the other pipelines or cavity that the pollutants such as bacterium or virus enter pulmonary function detection instrument, can avoid the cross-infection during pulmonary function test (pft).
Description
Technical field
The utility model relates to pulmonary function detection fields, more particularly to can prevent the lung function flow sensing of cross-infection
Device.
Background technique
The products such as lung function instrument, spirometer on existing market are all made of the side of bite plus disposable breathing circuit filter
Method avoids cross-infection, although bite and filter be all it is disposable, disposable breathing circuit filter cannot select
The highest filter of efficiency is filtered, filter efficiency is higher, it is also bigger to the resistance of air-flow although isolation effect is better, to lung
The gas flow influence of functional examination also can be bigger, and the error of measurement is made to become larger, therefore disposable breathing circuit filter can only be taken into account
Filter efficiency selects the lesser filter of gas-flow resistance, in spite of the effect of isolation bacterium and virus, but can not thoroughly be isolated
Bacterium or cell entry flow sensor.
After avoiding cross-infection lung function instrument application filter, it is necessary to periodically lung function instrument be cleaned and be disappeared
Poison, medical lung function instrument is expensive, and structure is complicated, it is necessary to be professional by specific purpose tool disassembly instrument, and be easy
Damage, thorough drying is needed after disinfection, also needs to re-calibrate using preceding, whole process is comparatively laborious, consume many times and
Expense cannot use instrument in a very long time.
Summary of the invention
To overcome the above disadvantages, the purpose of this utility model is to provide one kind can prevent cross-infection for lung function
The flow sensor that can be measured, is hollow tubular structure, including main channel and set on the pressure port of main channel tube wall, main ventilation
Pipe outer wall is equipped with the pressure hole post communicated with pressure port gas, and the volume size of the pressure hole post internal cavities meets following
Condition: during pulmonary function detection, the gas of tester's exhalation or sucking enters pressure hole post by pressure port, and is kept
Without touching the connecting line other than flow sensor in pressure hole post.
According to The Ideal-Gas Equation and Boyle's law, at a certain temperature, the volume of quantitative gas and gas
Pressure is inversely proportional, and suitable pressure range is arranged, and indentation or the gas volume variation for overflowing pressure hole post chamber can be limited
System will not touch the connecting line other than flow sensor in pressure hole post.
Wherein, the volume of pressure hole post internal cavities meets the following conditions, V1>K(V1+V2), V1For pressure hole post inner body
Product, V2For the gas volume in the connecting pipe that connect with pressure hole post, K is constant.
Further K value calculation is, according to formula IV and Δ p compared with atmospheric pressure, obtains K value, wherein formula IV:Δ p is the pressure difference of expiration intake section and aditus laryngis portion in formula, and ρ is fluid density, and Q is flow, A1
For the sectional area of intake section, A2For the sectional area in aditus laryngis portion, pass through adjusting A1With A2, obtain Δ p.
Preferably, the K value is 10%.
Further, the main channel master includes the expiration intake section being sequentially connected, the first tapering, aditus laryngis portion and second
Tapering offers low pressure pressure port on the tube wall in aditus laryngis portion and is connected to low pressure pressure hole post, opens on the tube wall of expiration intake section
It is connected to equipped with the first high pressure pressure port and with the first high pressure pressure hole post, high pressure pressure hole post passes through connecting pipe and differential pressure pickup
Positive press bond, low pressure pressure hole post by the negative press bond of connecting pipe and differential pressure pickup,
Further, the second high pressure pressure port is offered on the tube wall in the second tapering and is connected with the second high pressure pressure hole post
It is logical, the positive press bond of the second high pressure pressure hole post and differential pressure pickup.
Further, expiration intake section and aditus laryngis portion are cylindrical, and the diameter of expiration intake section is greater than the diameter in aditus laryngis portion,
First tapering and the second tapering are in truncated cone-shaped, and the first tapering and the lesser one end of the second taper diameter are respectively facing aditus laryngis portion.
Further, the cylinder outer wall of pressure hole post is equipped with groove void, and sealing ring is assembled in the groove void.
It further, further include gripping mechanism.
Further, the gripping mechanism on flow sensor by attachment base be removably connected on lung function instrument with
The connecting pipe of differential pressure pickup connection.
The utility model provides a kind of method that lung function tests prevent cross-infection in the process, including provides a kind of stream
Quantity sensor, the flow sensor are hollow tubular structure, main including main channel and set on the pressure port of main channel tube wall
Ventilation pipe outer wall is equipped with the pressure hole post communicated with pressure port gas, and the volume size of the pressure hole post internal cavities meets
The following conditions: during pulmonary function detection, the gas of tester's exhalation or sucking enters pressure hole post by pressure port, and by
It is maintained in pressure hole post without touching the connecting line other than flow sensor.
Wherein, the volume of pressure hole post internal cavities meets the following conditions, V1>K(V1+V2), V1For pressure hole post inner body
Product, V2For the gas volume in the connecting pipe that connect with pressure hole post, K is constant.
Further K value calculation is, according to formula IV and Δ p compared with atmospheric pressure, obtains K value, wherein formula IV:Δ p is the pressure difference of expiration intake section and aditus laryngis portion in formula, and ρ is fluid density, and Q is flow, A1
For the sectional area of intake section, A2For the sectional area in aditus laryngis portion, pass through adjusting A1With A2, obtain Δ p.
Preferably, the K value is 10%.
The utility model additionally provides a kind of lung function instrument that can prevent cross-infection, including flow sensor, with lung
Detachable the fitting together of function instrument host collectively forms lung function instrument.The flow sensor is hollow tubular structure, packet
Main channel and the pressure port set on main channel tube wall are included, main channel outer wall is equipped with the pressure communicated with pressure port gas
The volume size of hole post, the pressure hole post internal cavities meets the following conditions: during pulmonary function detection, tester's exhalation
Or the gas of sucking enters pressure hole post by pressure port, and is maintained in pressure hole post without touching flow sensor
Connecting line in addition.
Wherein, the volume of pressure hole post internal cavities meets the following conditions, V1>K(V1+V2), V1For pressure hole post inner body
Product, V2For the gas volume in the connecting pipe that connect with pressure hole post, K is constant.Preferably, the K value is 10%.
Further K value calculation is, according to formula IV and Δ p compared with atmospheric pressure, obtains K value, wherein formula IV:Δ p is the pressure difference of expiration intake section and aditus laryngis portion in formula, and ρ is fluid density, and Q is flow, A1
For the sectional area of intake section, A2For the sectional area in aditus laryngis portion, pass through adjusting A1With A2, obtain Δ p.
The lung function instrument includes differential pressure pickup.The differential pressure pickup passes through the pressure of connecting pipe and flow sensor
Hole post connection.
Compared with prior art, the beneficial effects of the utility model are: air energy in flow sensor pressure hole post
Enough play buffer action, the gas for breathing out subject is not readily accessible to the other instruments equipment of lung function instrument, such as with pressure
The attachment base or conduit of hole post connection, therefore the attachment base and conduit being reused can not touch the gas of subject,
And flow sensor described in the utility model can be replaced at any time, thus avoid cross-infection.
Detailed description of the invention
There are two the disposable flow sensor diagrammatic cross-sections of pressure hole post for Fig. 1 tool.
The structural schematic diagram that Fig. 2 disposable flow sensor shown in FIG. 1 is connect with differential pressure pickup.
Air column change location diagrammatic cross-section when Fig. 3 tool is exhaled there are two the disposable flow sensor of pressure hole post.
There are three the disposable flow sensor diagrammatic cross-sections of pressure hole post for Fig. 4 tool.
The structural schematic diagram that Fig. 5 disposable flow sensor shown in Fig. 4 is connect with differential pressure pickup.
Air column change location diagrammatic cross-section when Fig. 6 tool is exhaled there are three the disposable flow sensor of pressure hole post.
There are three air column change location diagrammatic cross-sections when the disposable flow sensor air-breathing of pressure hole post for Fig. 7 tool.
Flow sensor and T shape pipe connection schematic diagram in Fig. 8 embodiment 4.
Specific embodiment
The flow sensor of pulmonary function detection is used for as shown in Fig. 1 to 7, with lung function instrument host removably group
It is fitted together and collectively forms lung function instrument.The flow sensor can prevent cross-infection, including main channel and be set to main logical
The pressure port of tracheae tube wall, main channel outer wall are equipped with the pressure hole post communicated with pressure port gas.Pulmonary function test (pft) person warp
Main channel exhalation or sucking gas, pressure port are the sampled points of gas flow in differential pressure pickup acquisition main channel.Pressure difference
The gas-guide tube of sensor is not directly connected to pressure port, but is indirectly attached to pressure port by pressure port column.It is described to take
The volume size of pressure hole post internal cavities meets the following conditions: during pulmonary function detection, the gas of tester's exhalation or sucking
Know from experience and be pressed by pressure port or overflow pressure hole post, but be limited in pressure hole post it is interior without touch flow sensor with
Outer connecting line.
There are two the flow sensors of pressure hole post for the tool of embodiment 1
Flow sensor as shown in Figures 1 to 3, main channel include the expiration intake section 1 being sequentially connected, the first tapering
2, aditus laryngis portion 3 and the second tapering 4.Low pressure pressure port 31 is offered on the tube wall in aditus laryngis portion 3 and is connected to low pressure pressure hole post 5,
The first high pressure pressure port 21 is offered on the tube wall of expiration intake section 1 and is connected to the first high pressure pressure hole post 6.Expiration intake section
1 and aditus laryngis portion 3 it is cylindrical, the diameter of expiration intake section is greater than the diameter in aditus laryngis portion.Section in the first tapering 2 and the second tapering 4
Face is in truncated cone-shaped, and the first tapering and the lesser one end of the second taper diameter are respectively facing aditus laryngis portion.
As shown in Fig. 2, the connecting pipe 201 of differential pressure pickup 200 is connected on the pressure hole post jack 101 of attachment base 100,
The position of the pressure hole post jack 101 and the low pressure pressure hole post 5 of flow sensor and the first high pressure pressure hole post 6 are opposite
It answers.The pressure hole post of flow sensor shown in Fig. 2 is inserted into the pressure hole post jack 101 of attachment base, pressure difference can be completed
The connection of sensor connecting pipe and flow sensor pressure port.The positive press bond of high pressure pressure hole post and differential pressure pickup is low
Press the negative press bond of pressure hole post and differential pressure pickup.As shown in figure 3, when tester is into the main channel of flow sensor
After incoming call gas, the gas of incoming call passes through low pressure pressure port 31 respectively and high-pressure sampling hole 21 enters low pressure pressure hole post 5 and height
It presses in pressure hole post 6.The gas 301 that original air 300 is just newly entered in pressure hole post and connecting pipe 201 constantly compresses,
Until the gas and original gas in new incoming call to pressure hole post establish new balance.In pressure hole post described in the utility model
The volume size of portion's cavity meets the following conditions: when tester exhalation gas pressure hole post is entered by pressure port after, newly into
The gas entered can compress the air in the air being originally present in pressure hole post and the pipeline being attached thereto, but compressed sky
Gas is topmost always positioned in pressure hole post.As shown in figure 3, being established since the volume of pressure hole post internal cavities is enough to ensure that
When new balance, the gas 301 newly entered, which is still retained in pressure hole post, will not enter connecting pipe.
There are three the flow sensors of pressure hole post for the tool of embodiment 2
The flow sensor as shown in Fig. 4 to 7, main channel include the expiration intake section 1 being sequentially connected, the first tapering
2, aditus laryngis portion 3 and the second tapering 4.Low pressure pressure port 31 is offered on the tube wall in aditus laryngis portion 3 and is connected to low pressure pressure hole post 5,
The first high pressure pressure port 21 is offered on the tube wall in the first tapering 2 and is connected to the first high pressure pressure hole post 6.Second tapering 4
The second high pressure pressure port 41 is offered on tube wall and is connected to the second high pressure pressure hole post 7.Expiration intake section 1 and aditus laryngis portion 3 are in
Cylinder, the diameter of expiration intake section are greater than the diameter in aditus laryngis portion.The section in the first tapering 2 and the second tapering 4 is in truncated cone-shaped, the
One tapering and the lesser one end of the second taper diameter are respectively facing aditus laryngis portion.
As shown in figure 5, the connecting pipe 201 of differential pressure pickup 200 is connected on the pressure hole post jack 101 of attachment base 100,
The position of the pressure hole post jack 101 is corresponding with the low pressure pressure hole post of flow sensor and high pressure pressure hole post.First
The positive press bond of high pressure pressure hole post 6 and the first differential pressure pickup, the second high pressure pressure hole post 7 and the second differential pressure pickup
The low-pressure end of positive press bond, two differential pressure pickups is connect with low pressure pressure hole post 5 respectively by tee tube.As shown in fig. 6,
After tester's incoming call gas into the main channel of flow sensor, the gas of incoming call passes through low pressure pressure port 31 and height respectively
Sampling hole 21,41 is pressed to enter in low pressure pressure hole post 5 and high pressure pressure hole post 6,7.It is original in pressure hole post and connecting pipe 201
The gas 301 that air 300 is just newly entered constantly compresses, until the gas in new incoming call to pressure hole post is built with original gas
Found new balance.As shown in fig. 7, after tester sucks gas into the main channel of flow sensor, the gas point of incoming call
Not Tong Guo low pressure pressure port 31 and high-pressure sampling hole 21,41 enter in low pressure pressure hole post 5 and high pressure pressure hole post 6,7.Pressure
The gas 301 that original air 300 is just newly entered in hole post and connecting pipe 201 constantly compresses, until being newly sucked into pressure port
Gas and original gas in column establish new balance.The big Grain Full of volume of pressure hole post internal cavities described in the utility model
Sufficient the following conditions: after the gas that tester breathes out or sucks enters pressure hole post by pressure port, the gas newly entered can be pressed
The air to contract in the air being originally present in pressure hole post and the pipeline being attached thereto, but compressed air the top is always
In pressure hole post.As shown in Figures 6 and 7, new balance is being established since the volume of pressure hole post internal cavities is enough to ensure that
When, the gas 301 newly entered will not enter connecting pipe.
3 flow sensor of embodiment optimizes structure
Flow sensor is disposable, is detachable connection between differential pressure pickup when use.
In order to guarantee connecting pipe is connect with flow sensor in test process air-tightness, pressure hole post and it is attached thereto
It is equipped with sealing element between pipeline, such as is externally provided with groove void 9 for storing sealing ring 19 in the pressure hole post of flow sensor.
In further embodiments, flow sensor further includes that flow sensor can be stably mounted to lung function instrument host
On gripping mechanism.Gripping mechanism is that can guarantee that the flow sensor on insertion lung function host will not take off in use
It falls, while after use, flow sensor can be extracted smoothly from the host of lung function instrument again.The gripping mechanism for example but
It is not limited to, such as the gripping mechanism of flow sensor is the claw 11 of plum blossom-shaped structure, there is certain elasticity folding, attachment base
Or flow sensor host is equipped with the component 102 matched with the claw.In another example gripping mechanism is with press-button structure
Suppress buckle.
The calculation method of 4 pressure hole post chamber portions of embodiment
According to bernoulli principle, fluid flow rate and pressure meet equation:P is stream in formula
The pressure that certain in body is put, v are the flow velocity of the air-flow point, and ρ is fluid density, and g is acceleration of gravity, and h is height where the point, C
It is a constant.For gas, gravity can be ignored, be formula I by simplified formula:The flow velocity of air-flow is bigger,
Pressure is smaller.Flow and flow velocity meet formula II: v=Q/A, and Q is flow in formula, and A is the sectional area of the air-flow pipe.Air-flow
The flow for flowing through expiration intake section and aditus laryngis portion is equal, but sectional area is unequal, can show that flow velocity is also unequal according to formula II,
If the sectional area of intake section is A1, flow velocity v1, pressure p1；The sectional area in aditus laryngis portion is A2, flow velocity v2, pressure p2.Root
According to formula I, pressure difference can be releasedFormula IV can be obtained with the substitution of formula II again:According to lung function instrument examination criteria, detection flows peak value is 14L/s, by adjust exhale into
The sectional area in gas portion and aditus laryngis portion makes the pressure difference peak value 10kPa of expiration intake section Yu aditus laryngis portion.When there is no air-flow to flow through flow
When sensor, p1、p2It is all standard atmospheric pressure, when there is air-flow to flow through flow sensor, p1、p2It can be within the scope of 10kPa up and down
Fluctuation, standard atmospheric pressure is about 101kPa, therefore the pressure change range of pressure tappings is 10%.
According to The Ideal-Gas Equation and Boyle's law, at a certain temperature, the volume of quantitative gas and gas
Pressure is inversely proportional, and meets formula III: PV=C, and P is the pressure of gas in formula, and V is the volume of gas, if pressure hole post inner volume
For V1, the gas volume in connecting pipe is V2, P and (V can be released according to formula III1+V2) be inversely proportional, P declines 10%, then (V1+
V2) become larger 10%；Conversely, P rises 10%, then (V1+V2) become smaller 10%, volume (V1+V2) size variation can cause air column
Fluctuation up and down, as long as guarantee V1> 10% (V1+V2), the air-flow for flowing through flow sensor only can partially be pressed into pressure hole post
It is interior, without entering connecting pipe.Since flow sensor is disposable, the air in flow sensor pressure hole post can be risen
The attachment base for being not readily accessible to attachment base or connecting pipe to buffer action, the gas for breathing out subject, therefore being reused
The gas that subject can not be touched with connecting pipe, avoids cross-infection.
Embodiment 5 prevents the comparative test of cross-infection
Two kinds of disposable flow sensor 10, attachment base and differential pressure pickups are pressed into Fig. 2 (experimental group after sterilization treatment
1) (experimental group 2) is connected with Fig. 5, and cylinder 402 is then calibrated with atomizer 401 and 3L respectively by T shape pipe 400 and is attached, such as
Shown in Fig. 8.It is 5 × 10 with 0.9% physiological saline configuration bacterium colony8The standard bacteria suspension 5ml of cfu/ml opens atomizer and produces
Endophytic bacteria aerosol droplet, then cylinder mould personification body forced expiration is calibrated by 3L, bacterial aerosol droplet and air mixing are pushed away
Become a mandarin quantity sensor, continuous to exhale 5 times, finally extracts disposable flow sensor, separates attachment base and connecting pipe, respectively with adopting
Sample liquid carries out microbionation, culture, carries out bacterium colony counting after culture 48 hours.Specific comparative experiments step is referring to " lung function
Detect the development and exploitation of dedicated breathing circuit filter " (2003 grades of master thesis, Guangzhou Medical College, in May, 2006).
Table 1: the sterile test result of experimental group 1
Table 2: the sterile test result of experimental group 2
Experimental result is shown in Tables 1 and 2s, and as a result flow sensor described in the utility model can guarantee the connection being attached thereto
Seat and connecting pipe still conform to Sterile standard after pulmonary function detection.
Claims (10)
- Be hollow tubular structure 1. the flow sensor for lung function tests of cross-infection can be prevented, including main channel and Set on the pressure port of main channel tube wall, main channel outer wall is equipped with the pressure hole post communicated with pressure port gas, feature It is, the pressure hole post is hollow cylinder, and the volume size of pressure hole post internal cavities meets the following conditions: in lung function Can be in detection process, the gas of tester's exhalation enters pressure hole post by pressure port, and be maintained at pressure hole post it is interior without The connecting line other than flow sensor can be touched.
- 2. flow sensor according to claim 1, which is characterized in that the volume of pressure hole post internal cavities meets following Condition, V1> K (V1+V2), wherein V1For pressure hole post inner volume, V2For the gas body in the connecting pipe that is connect with pressure hole post Product, K is constant.
- 3. flow sensor according to claim 2, which is characterized in that be calculated according to formula IV and formula IV Δ p obtains K value compared with atmospheric pressure；Formula IV:Δ p is expiration intake section and aditus laryngis in formula The pressure difference in portion, ρ are fluid density, and Q is flow, A1For the sectional area of intake section, A2For the sectional area in aditus laryngis portion, pass through adjusting A1 With A2, obtain Δ p.
- 4. flow sensor according to claim 2, which is characterized in that the K value is 10%.
- 5. flow sensor according to claim 1, which is characterized in that the main channel master includes exhaling of being sequentially connected Gas intake section, the first tapering, aditus laryngis portion and the second tapering, offer on the tube wall in aditus laryngis portion low pressure pressure port and with low pressure pressure Hole post is connected to, and is offered the first high pressure pressure port on the tube wall of expiration intake section and is connected to the first high pressure pressure hole post, high pressure Pressure hole post passes through the positive press bond of connecting pipe and differential pressure pickup, and low pressure pressure hole post passes through connecting pipe and differential pressure pickup Negative press bond.
- 6. flow sensor according to claim 5, which is characterized in that offer the second high pressure on the tube wall in the second tapering Pressure port is simultaneously connected to, the positive press bond of the second high pressure pressure hole post and differential pressure pickup with the second high pressure pressure hole post.
- 7. flow sensor according to claim 1, which is characterized in that expiration intake section and aditus laryngis portion are cylindrical, exhale The diameter of gas intake section is greater than the diameter in aditus laryngis portion, and the first tapering and the second tapering are in truncated cone-shaped, the first tapering and the second tapering The lesser one end of diameter is respectively facing aditus laryngis portion.
- 8. flow sensor according to claim 1, which is characterized in that the cylinder outer wall of pressure hole post is equipped with groove void, close Seal is assembled in the groove void.
- 9. flow sensor according to claim 1, which is characterized in that further include gripping mechanism.
- 10. flow sensor according to claim 1, which is characterized in that the gripping mechanism on flow sensor passes through company Joint chair is removably connected to the connecting pipe connecting on lung function instrument with differential pressure pickup.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721034523.3U CN208447594U (en) | 2017-08-17 | 2017-08-17 | It can prevent the flow sensor for lung function tests of cross-infection |
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| CN201721034523.3U CN208447594U (en) | 2017-08-17 | 2017-08-17 | It can prevent the flow sensor for lung function tests of cross-infection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117582212A (en) * | 2023-11-23 | 2024-02-23 | 中科(安徽)G60智慧健康创新研究院 | A device and method for measuring pulmonary ventilation function based on the principle of sound diffraction |
-
2017
- 2017-08-17 CN CN201721034523.3U patent/CN208447594U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117582212A (en) * | 2023-11-23 | 2024-02-23 | 中科(安徽)G60智慧健康创新研究院 | A device and method for measuring pulmonary ventilation function based on the principle of sound diffraction |
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