CN1189091A - Flow peak monitoring device - Google Patents

Abstract

Portable peak expiratory flow rate (PEFR) monitoring devices are known that use whistles or reeds that are theshold-activated in order to register PEFR. This invention provides a PEFR monitoring device including a threshold-activated reed (16) located in an outlet formed in a body. The body comprises inlet and outlet body shells (12, 14) that are interengageable with one another in a plurality of rotational positions of the shells relatively to one another. A vent opening (26) extends axially along the length of the outlet shell (14). The inlet shell (12) includes a mouthpiece (18) that extends into a cylindrical occluder (20), the upper edge (20.1) of which is spirally shaped. When the shells are interengaged, the occluder (20) extends into the outlet shell to occlude the vent to a greater or lesser extend, depending on the rotational position of the shells (12, 14), thereby to direct a greater or lesser proportion of the flow through the reed assembly (16). The body shells (12, 14) that are lockable to one another to set the vent outler size, normally in accordance with a predetermined treatment protocol.

Description

Flow peak monitoring device

The invention relates to a flow monitoring device, in particular to a monitoring device for peak value of expiratory flow.

Peak expiratory flow rate (PEFR), a measure of human lung function, can be easily and accurately measured by several devices. Home monitoring of PEFR is now recognized as a means of monitoring asthma conditions. This parameter can be reliably monitored by the subjects participating in the experiment without the help of a professional technician, and, from 1959 (Wright BM, McKerrow CB: Maximal forced expiratory air flow rate as a measure of ventilation volume - British Medical , 2, 1041-1959) since its prototype appeared, this parameter has been widely used.

There are several commercially available portable PEFR measurement devices. These devices differ in portability, calibration method, cost, and operation method because they are roughly divided into two different categories according to the working principle. The first type of device involves the displacement of a spring-loaded piston, which is dependent on the pressure induced by the exhaled flow and the area of the opening provided behind the piston. The second type of device utilizes a whistle or reed that typically triggers the PEFR through a threshold.

The first category of devices includes common instruments such as Wright Reak flow meters and spirometry curve monitors.

An early device of the second type is described in British Patent No. 1,018,387 to De Bono, and an evaluation of this device is reported in The Lancet, Issue 31, July 1965, page 212, by Colley JRT, Holland WW. The second type of device consists of the peak flow flute, the initial prototype of which is found in Chiaramonte LT, Prabha SL, Annals of Allergic Allergies, Issue 47, August 1981, pp. 95-98: Peak flow flute : Preliminary report—a later version is found in Chiaramonte LT, Goldstein S, Rockwell W, Annals of Allergic Allergy, No. 52, March 1984, pp. 155-158: Update on peak flow flutes Report on improved design. This device is also the subject of US Patent No. 4,421,120 to Edwards. Another such device is seen in Kraemer, US Patent No. 5,357,975, which describes a sounder-equipped flute whose design and construction take advantage of the characteristics of common wind instruments. The device uses time and sound measurement electronics to estimate the subject's expiratory volume curve.

The flute invented by De Bono consists of a plastic tube with a jug-shaped flute at one end. A movable thick cardboard mouthpiece is fitted on the other end of the plastic pipe, and an air leak hole is arranged under one side of the plastic pipe, and the size of the air leak hole can be adjusted by moving the mouthpiece. The airflow through the flute needs to reach a certain critical level to produce sound, and the size of the leak hole can be increased by gradually retracting the movable mouthpiece, thereby obtaining a stepwise increase in airflow rate to produce the flute sound. This device has the disadvantage that the flute loses its volume and sharpness at low airflow rates. In addition, the flow of exhaled air and any explosive wheezing produced by the subject tends to drown out or mimic the flute.

The peak expiratory volume flute invented by Edwards uses a threshold-triggered reed to indicate the peak expiratory volume. Its characteristic is that the reed can only make a sound when the flow rate of the outlet opening is equal to or less than the peak expiratory volume of the subject. Before use, the air outlet opening can be set at a known "critical" level by adjusting a rotatable shutter, so that it corresponds to a predetermined value of the peak expiratory volume of the subject. Thereafter, the subjects were instructed to blow air through the monitoring device, widening the opening with each exhalation attempt until the flute ceased to sound. In the above-mentioned series of attempts, the last gate position where the flute can still produce sound corresponds to the peak value of the expiratory volume.

The devices invented by De Bono and Kraemer all have the following defect, that is, their sound generators do not have a clearly determinable threshold.

The flow monitoring device according to the present invention includes a signal generator suitable for sending out a signal. The generation of the signal depends on whether the flow rate of the fluid passing through the signal generator reaches a predetermined amount. The signal generator is located in a fluid channel Among them, the fluid channel is distributed between the air inlet and the air outlet opening on the device body. The size of the air outlet opening is variable, so that the flow resistance characteristics of the fluid channel can be adjusted. Moreover, the device can compare the predetermined The variation of the air outlet opening size is used to set the change of the air outlet opening.

As a preferred solution, the size of the air outlet opening can be incrementally adjusted and set.

In a preferred solution of the present invention, the sounder is constituted by a tongue reed located in an air outlet part provided on the body of the device, which is suitable for triggering a sound by a threshold value, and the generation of the sound depends on the fluid passing through the reed Whether the flow rate has reached a predetermined amount, in addition, by setting the state of the air outlet opening, the flow rate of the fluid can be preset.

As a preferred solution, the reed and air outlet openings use different outlets on the body of the device, and the opening of the reed can simply be made in the shape of a horn that expands towards the external environment, thereby substantially improving the signal-to-noise ratio of the device .

Preferably, the static and dynamic flow thresholds of the sounder or reed are numerically close to each other, thereby minimizing misjudgments of optimistic estimates of the sound produced by pulsating airflow, an example of where pulsating airflow may occur is : The airflow through the device is explosively contrasted with the smooth exhalation airflow.

In order to further improve the signal-to-noise ratio of the device, the main frequency of the sounder is set within the maximum range that the human ear can be sensitive to, and its preferred value is between 800Hz and 1000Hz, or it can be simply set at about 1000Hz.

Incorrect articulations caused by large fluctuations in airflow - such as when explosive airflow passes through the device in sharp contrast to the smooth expiratory flow - can be minimized by simple means, relative to through-device The main fluid flow of the body filters the sounder. This can be adequately achieved by arranging the sound generator downstream of a transverse barrier traversing the above-mentioned flow path.

If the device body is suitable for constituting the resonance chamber of the sound generator, the signal-to-noise ratio of the device can be further improved. Instead, the device body can be made in the shape of an essentially spherical resonant cavity.

In a solution suitable for the injection molding plastic manufacturing process as described in the present invention, the monitoring device may include several tube shells that can be interconnected as the device body, the gas outlet part is arranged on a certain tube shell, and the other tube shell The casing is provided with a blocking tube of the air outlet part, and the tube shells can move relative to each other, so that the blocking tube more or less blocks the gas outlet part, and the degree of blocking depends on the relative positional relationship between the tube shells. In this way, the gas outlet In addition, the relative movement of the respective shells can be at least partially locked to each other, so that the air outlet can be set to correspond to a certain size of the air outlet opening. Predetermined amount of change.

In this solution of the present invention, the device body may include an inlet pipe shell and an air outlet pipe shell, the two can be connected to each other according to several positional relationships formed by relative rotation, and the air outlet pipe shell is formed by an outer wall that is closed into a resonance cavity , the resonator cavity is provided with an air outlet opening, and the inlet pipe shell is composed of a mouthpiece extending into a cylindrical blocking tube. The entire length of the outlet shell, and, when the shells are interconnected, the blocking tube will be able to protrude into the outlet shell, thereby blocking the air outlet more or less, depending on the distance between the shells. The relative angular position relationship.

The intake and outlet pipe shells can be conveniently provided with a complementary joint structure that clamps them together. The joint structure is composed of an inward curl and an outward undercut groove, wherein the curl is formed on the outer wall of the air outlet shell At the joint end of the inlet pipe, undercut grooves are formed on the circumferentially distributed flanges on the outer periphery of the intake pipe casing. The dimensions of the crimp to the outlet casing joint and the undercut groove and flange are such that the inlet and outlet casings can be clamped to each other by the crimp fitting into the undercut groove.

The air outlet part can be formed by the inward bending part of the outer wall of the air outlet pipe shell. The flange of the air inlet pipe shell is provided with a connecting ring, and the groove facing the outside on it matches the bottom end of the opening wall of the edge of the air outlet opening in shape. The bottom end of the opening wall can interact with the groove in the connecting ring, so that the inlet pipe shell is locked on the air outlet pipe shell according to a predetermined angular position relationship.

Outwardly facing grooves allow for relatively small corner increments conveniently.

In this solution of the present invention, a stop structure can be provided on the blocking pipe, in terms of its position, it can be blocked on the curved opening wall under the state of the maximum angular position of the inlet pipe shell relative to the outlet pipe shell.

The following description refers to a flow monitoring device used as a peak expiratory volume monitor, however, if the sounder responds acoustically to both directions of flow through it, then the device described above will also Suitable for bi-directional fluid channels. A two-way reed would be an example of such a sounder.

Fig. 1 is an exploded perspective view of the device as projected from the gas outlet of the monitoring device according to the present invention;

Figure 2 is an exploded perspective view of the device viewed from the inlet end of the monitoring device shown in Figure 1;

Fig. 3 is a schematic sectional view along line 3-3 in Fig. 2;

Fig. 4 is an isometric projection view of the reed assembly of the monitoring device according to the present invention;

Fig. 5 is a schematic sectional view along line 5-5 in Fig. 4;

Fig. 6 is a schematic sectional view along line 6-6 in Fig. 5;

Figure 7 is a side view (partial cutaway) of the monitoring device according to the present invention; and

Fig. 8 is an end view (partial section) of the monitoring device according to the present invention.

The monitoring device according to the present invention is not a flow meter and is not designed to measure the absolute flow through the device. In fact, the function of the device is to monitor the peak expiratory flow rate (PEFR) of the subject. Its approach is to monitor whether the subjects can reach a predetermined PEFR threshold. In this sense, the monitoring device according to the present invention is a threshold monitor which monitors the achieved PEFR of the subject relative to the symptom threshold.

The pre-determined PEFR is a symptom threshold that is dependent on the subject's history of therapy following the prescription after his pre-onset or predicted PEFR was measured.

Referring to FIG. 3 , it can be seen that the monitor 10 according to the present invention includes a pair of mutually nested shells 12 , 14 and a sounder composed of a reed assembly 16 .

The casing 12 is basically the inlet casing, while the casing 14 is the outlet casing, and the manner in which the two are connected to each other is as described below with reference to FIGS. 7 and 8 .

In actual use, the subject first inhales as much as possible and then sends or exhales air through the cylindrical tube forming the mouthpiece 18 at the inlet end of the inlet tube housing 12 . The subject is usually told not to cough, nor is it allowed to produce a burst of exhaled airflow, such as spitting, coughing, or interruption of airflow caused by the tongue blocking the mouthpiece, however, as will be seen below, as described in the present invention The design of the monitoring device 10 minimizes possible errors caused by such explosive expiratory flow.

The air outlet shell 14 is composed of an outer wall 24 closed into a resonant cavity 46 , and the outer wall 24 is provided with air outlet openings 26 longitudinally distributed over the entire length of the air outlet shell 14 . A central housing for the reed assembly 16 is distributed longitudinally inside the resonance chamber 46 .

The shells 12, 14 are designed to interconnect with each other (by means of an interengaging clamping configuration, described in more detail below), and the reed assembly 16 is also designed to be located within the trumpet housing 22.

Mouthpiece 18 extends into a cylindrical blockage tube 20 whose upper edge is helically cut. When the tube shells 12, 14 are connected, the blocking tube 20 will protrude in and out of the tracheal shell 14, thereby more or less blocking the opening 26, the degree of blocking depends on the position of the upper edge of the blocking tube 20 relative to the opening 26, This position in turn depends on the degree to which the shells 12, 14 are rotated relative to each other.

When the air flow exhaled by the subject passes through the mouth piece 18 and the air outlet shell 14 , a part of the air flow will escape through the air outlet opening 26 , and at the same time, a part of the air flow will be guided through the reed assembly 16 . Through the rotation of the inlet tube housing 12 relative to the outlet tube housing 14 , the helical blocking tube 20 will more or less block the outlet opening 26 , thereby controlling the extent to which the exhaled airflow is guided through the reed assembly 16 . If a sufficient amount of airflow is drawn through the mouthpiece 18, it will make a sound.

Referring to Figures 4, 5 and 6, it can be seen that the reed assembly 16 is formed by a pair of baffles 28, 30 which block half of the opposite ends of the tubular casing 32, respectively. Tongue pad 34 is distributed between baffle plate 28,30 along the axial direction, is provided with opening 36 on it, and elastically deformable tongue 38 can be fixed on the opening by connecting its fixed end 40 on the tongue pad 34. 36 interior.

Reed assembly 16 is non-linear (so-called linear flute, its phonation situation can be described in the example below, can send out twice the volume under twice the air flow), and the selected reed length, shape and quality It can produce sound in the most sensitive frequency range of human hearing. The reed 38 is adapted to produce a sound with a pitch of about 1000 Hz. Despite the non-linear nature of the reed 38, the device 10 can, in fact, be "linearized" by the proper design of the helical obstruction tube.

More importantly, the reed assembly 16 produces a crisp and sharp audible impact when the airflow threshold is exceeded. With this in mind, the component can be thought of as an analog-to-digital converter that is either "on" or "off" with no intermediate states. To this end, the reed assembly is manufactured to tight tolerances to ensure minimal part-to-part tolerances so that each reed 38 can be activated at the same airflow threshold. This aspect eliminates the need to calibrate each monitoring device 10 .

Additionally, the shape of the reed 38 ensures that the reed assembly 16 has similar dynamic and static airflow thresholds, thereby minimizing the generation of inaccurate sounds that result from fluctuations in airflow, such as when the device 10 Incorrect sounds may occur when an explosive airflow is passed that contrasts greatly with the smooth exhaled airflow.

Referring to FIG. 3 , the reed assembly 16 is pressed into the casing 22 and protrudes along the inner cavity of the air outlet casing 14 . The outer shape of the reed assembly 16 and the inner shape of the casing 22 are complementary truncated cones. The lead-in end of the reed assembly 16 opens toward the interior cavity of the lead-in end 42 of the housing 22, and the lead-in end of the reed assembly opens outwardly to the external environment within the flared opening 48 of the housing 22. The trumpet-shaped opening 48 can improve the pitch of the device, and the air outlet shell 14 forming the resonant cavity 46 around the casing 22 also has the effect in this respect.

The lead-in end 42 of the housing 22 is provided with bars 44 extending transversely (this is shown in more detail in FIG. 2 ). Barrier 44 acts as a low pass filter which helps to prevent the situation where the subject triggers reed 38 with a burst or pulsating exhalation flow technique in order to obtain an overly optimistic test result.

The inlet and outlet pipe housings 12, 14 are provided with complementary engaging formations that allow the two to be clamped together. As shown in FIGS. 3 and 7 , the articulating formation consists of an inward bead 54 formed at the joint end 52 of the outer wall 24 of the outlet pipe housing 14 and an outward undercut groove 56 formed at the tubular mouthpiece. 18 on the flange 58 distributed along the circumferential direction. For the bead 54 and the joint end 52 of the outlet pipe housing 14, as well as the undercut groove 56 and the flange 58, the dimensions must be designed to ensure that the inlet and outlet pipe housings 12, 14 can fit into the undercut groove 56 through the bead 54 And sandwiched together.

Referring to FIGS. 1 , 2 and 8 , it can be seen that the edge of the outlet opening 26 is defined by the inwardly curved portion 50 of the outer wall 24 of the outlet tube housing 14 . The gas outlet opening wall 50 is curved and has an aerodynamic shape to minimize the noise caused by the gas escaping the opening 26 .

A connecting ring 60 is provided with a groove on the flange 58 , and the groove facing outward is matched with the bottom end 62 of the opening wall 50 at the edge of the opening 26 . When interconnecting the inlet tube shell 12 and the outlet tube shell 14, the doctor must align the curved opening walls 50.1, 50.2 with the grooves in the connecting ring 60, thereby locking the intake tube shell 12 in the outlet tube according to a predetermined angular position relationship. On the tracheal shell 14. For the connection of the undercut groove 56-flange 58 on the tube housing 12,14 and the connection of the groove connecting ring 60 and the bottom end 62 of the opening wall 50, the combination of the two will make the tube housing 12,14 be reliably locked, and made it almost impossible for the subject to change the locked state.

Due to the locking of the inlet tube housing 12 to the outlet tube housing 14 according to the predetermined angular position relationship, the helical blocking tube 20 will be locked in a specific position relative to the opening 26, thereby defining the effective outlet opening. As mentioned above, the outlet opening will depend on the treatment record.

An advantage of the grooved coupling ring 60 is that it allows the monitoring device 10 of the present invention to be adjusted in small increments.

The blocking pipe 20 is provided with a stop structure 64 , in terms of its position, it can be blocked on the curved opening wall 50 in the state of the maximum angular position of the inlet pipe casing 12 relative to the outlet pipe casing 14 . In a certain limit position, the stop structure 64 will bear against the curved opening wall 50.1 from the inside in the maximum "closed" state of the monitoring device 10, in which state the allowable The direction of rotation is such that the upper surface 20 . In another extreme angular position, the stop structure 64 will bear against the curved opening wall 50.2 from the inside in the maximum "open" state of the monitoring device 10, in which state the position of the inlet pipe housing 12 relative to the outlet pipe housing 14 Rotation is allowed in such a way that the upper surface 20 .

In practice, the clinician may first determine the subject's symptom threshold and then assemble the device 10 or instruct the subject to assemble the device 10 by connecting the inlet and outlet tube shells 12, 14 to each other and occluding the blocked tube. 20 is located at the angular position determined by the subject's treatment records. To facilitate this assembly, suitable markings may be made on one or more of the stopper tubes 20, the flange 58 and the outlet tube housing 14. For example, mating marks can be molded on the outer wall of the stopper tube 20 and the curved opening wall 50 on one or both sides. Furthermore, such markings can also be molded on the outer surface of the outer wall 24 of the outlet pipe housing 14 and on the end face of the flange 58 . To this end, a reasonable comparison of markers will be made to the treatment records. These flags may take the form of air velocity values.

Subjects only need to activate the home monitoring system - subjects will be told when to monitor airflow and how to use the monitoring device.

The main frequency of the reed 38 is well within the most sensitive hearing range of the human ear, and since the monitoring device has a rounded surface and the reed assembly 16 has a large resonant cavity and a trumpet-shaped housing, the reed has considerable High signal-to-noise ratio. In order to further improve the signal-to-noise ratio, the subject can be encouraged to turn the air outlet opening to the lower side and keep it away from the ear during use. Gripping features may be provided on the outer wall 24 of the outlet tube housing 14 to facilitate the aforementioned gripping and minimize the possibility of the subject accidentally blocking the opening 26 with his or her hand.

The device 10 can be predesigned for use by children or adults, if necessary. In the former case, the opening 26 can be pre-sized to allow a flow peak of up to 450 l/min, while in the latter case the opening can be pre-sized to allow a flow peak of up to Up to 800 l/min.

Therefore, the present invention also provides a method for monitoring the peak exhaled airflow velocity of a subject using the device of the present invention, the method being characterized in that the subject blows the air flow into the intake portion of the device, in which device, The caliber of the air outlet can be preset so that it corresponds to the predetermined value of the peak value of the exhaled flow velocity that the subject should achieve. To achieve the above presetting; moreover, the subject can monitor whether the signal generating device is triggered. If it is triggered, it means that the subject has reached the predetermined peak flow rate of the exhaled air flow. If it is not triggered, it means that the subject is not triggered. The subject failed to reach the predetermined peak flow rate of the exhaled airflow, and indicated that the subject must receive medical treatment or see a doctor and other treatment measures.

Claims (20)

1. flow monitoring device, it comprises a signal generator that is suitable for sending signal, whether the flow rate of fluid of passing this signal generator that depends on of signal has reached a predetermined amount, signal generator is arranged in certain fluid passage, this fluid passage is distributed in giving vent to anger between the opening of leaving on air inlet and the device body, the size of opening of giving vent to anger is variable, flow resistance characteristic that thus can the regulated fluid passage, and this device can be set the situation of change of the opening of giving vent to anger according to the predetermined opening size variable quantity of giving vent to anger.

2. flow monitoring device as claimed in claim 1, the size of the opening that it is characterized in that giving vent to anger can realize up regulation and can set.

3. as any one described flow monitoring device in claim 1 or 2, it is characterized in that: acoustical generator is made of tongue, tongue is arranged in the outlet gas part that is located on the device body, it is suitable for the passing threshold triggering and sounds, the generation of sound depends on whether the flow rate of fluid of passing this tongue has reached a predetermined amount, in addition, by setting out the state of air to open mouth, flow rate of fluid can be by default.

4. flow monitoring device as claimed in claim 3 is characterized in that the tongue and the opening of giving vent to anger have adopted the different outlets that are located on the device body.

5. as any one described flow monitoring device in claim 3 or 4, it is characterized in that the opening of tongue is made into the horn shape of expanding to external environment condition.

6. as any one described flow monitoring device in the claim 3 to 5, it is characterized in that the static state of tongue and dynamic flow threshold value are numerically closer to each other.

7. as the described flow monitoring device of above any one claim, the dominant frequency that it is characterized in that acoustical generator is between 800Hz to 1000Hz.

8. flow monitoring device as claimed in claim 7 is characterized in that the dominant frequency of acoustical generator is about 1000Hz.

9. as the described flow monitoring device of above any one claim, it is characterized in that acoustical generator is filtered with respect to the fluid primary flow path of through-going device body.

10. as the described flow monitoring device of above any one claim, it is characterized in that device body is suitable for constituting the resonator of acoustical generator.

11. flow monitoring device as claimed in claim 12, its device body is made into the shape that is essentially spherical resonator.

12. as the described flow monitoring device of above any one claim, it is characterized in that: become several shells of this device body but device body comprises mutual connection, its outlet gas part is located on a certain tube shell, then be provided with the chock tube of outlet gas part on another tube shell, can move relative to each other between shell, make chock tube stop outlet gas part more or less thus, stop that degree depends on the relative position relation between shell, like this, the size of gas outlet just can be changed, in addition, for each shell that can relatively move, it each other at least can be locked partly, thereby can be provided with the gas outlet, makes it a certain predetermined variation amount corresponding to the opening size of giving vent to anger.

13. flow monitoring device as claimed in claim 12 comprises air inlet and escape pipe housing, the two can be according to the some kinds of positions relation through relatively rotating formation each other and interconnection, the shell of giving vent to anger is made of the outer wall that seals into resonator, be provided with the opening of giving vent to anger in the resonator, the air inlet shell is made of the mouthpiece that puts in the column chock tube, chock tube is suitable for being positioned at gives vent to anger in the shell and has the scroll upper limb, the opening of giving vent to anger of giving vent to anger on the shell is distributed on the whole length of the shell of giving vent to anger along the longitudinal, and, when each shell is got up by mutual connection, chock tube will be put in the shell of giving vent to anger, thereby stop the gas outlet more or less, the degree that stops depends on shell relative angle position to each other.

14. flow monitoring device as claimed in claim 13, it is characterized in that: air inlet and escape pipe housing are provided with and can make the two complementation of clipping together be connected structure, being connected structure is made of inside crimping and outside nip, wherein, crimping is formed at the abutting end place of the shell outer wall of giving vent to anger, and it is peripheral along on the flange that circumferentially distributes that nip is formed at the air inlet shell.For crimping and escape pipe shell abutting end and nip and flange, its size design can guarantee air inlet and the shell of giving vent to anger can embed in the nip by crimping and clip together each other.

15. flow monitoring device as claimed in claim 14, it is characterized in that: outlet gas part is made of the interior bight portion of the shell outer wall of giving vent to anger, the flange of air inlet shell is provided with connecting ring, toward the outer side groove is in the bottom of the perforated wall that is matched with the edge of opening of giving vent to anger in shape on it, the bottom of curve-shaped opening wall can with the groove mutual connection in the connecting ring, thereby according to predetermined position, angle relation the air inlet shell is locked on the shell of giving vent to anger.

16. flow monitoring device as claimed in claim 15 is characterized in that: groove toward the outer side is suitable for realizing quite little corner increment.

17. as any one described flow monitoring device in claim 15 or 16, it is characterized in that: chock tube is provided with the backstop structure, with regard to its position, it can be blocked on the curve-shaped opening wall under the maximum angular position state of air inlet shell with respect to the shell of giving vent to anger.

18. be applicable to the bidirectional fluid passage as the described flow monitoring device of above any one claim, its acoustical generator all can produce voice response for two flow directions of the air-flow that flows through himself.

19. a flow monitoring device, this device meets the description that this description is done in conjunction with the accompanying drawings in principle.

20. the method for subject's exhaled air flow flow velocity peak value is monitored in an employing as device as described in above any one claim, it is characterized in that: the subject is blown into the induction part of this device with air-flow, in this device the bore of gas outlet through preestablishing and corresponding to the subject the predetermined value of the exhaled air flow flow velocity peak value that should reach; In addition, whether the subject will monitor signal generation apparatus and be triggered, if be triggered, represent that then the subject has reached predetermined exhaled air flow flow velocity peak value, if be not triggered, represent that then the subject fails to reach predetermined exhaled air flow flow velocity peak value, and the expression subject need receive treatment.

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