CN108836336B

CN108836336B - Pathology department gas collecting device comprising elastic bag body

Info

Publication number: CN108836336B
Application number: CN201810429917.1A
Authority: CN
Inventors: 李萍; 李奕槿; 袁辉
Original assignee: Yulin Second Hospital
Current assignee: Yulin Second Hospital
Priority date: 2018-05-08
Filing date: 2018-05-08
Publication date: 2021-04-27
Anticipated expiration: 2038-05-08
Also published as: CN108836336A

Abstract

The invention discloses a gas collecting device for a pathology department, which comprises an elastic bag body, and comprises: a collection bag and a flow guide device; the guiding device comprises: a housing; a stator; the rotor, the stator and the shell enclose a first pressure comparison cavity and a second pressure comparison cavity, the first pressure comparison cavity is communicated with the gas flow channel, and the biasing mechanism is arranged on the rotor; a throttling mechanism connected to the gas outlet so that the gas flowing out of the gas outlet passes through the throttling mechanism; a pressure comparison flow passage is formed between the throttling mechanism and the second pressure comparison cavity. Since the difference between the pressure of the gas outlet before entering the restriction and the pressure of the gas flowing out of the restriction remains substantially constant, and since the restriction defined by the restriction does not change during exhalation by the patient, the flow of gas through the restriction remains substantially constant, i.e.: the flow rate of the air flow flowing out of the throttling mechanism and into the bag body is kept substantially constant.

Description

Pathology department gas collecting device comprising elastic bag body

Technical Field

The invention relates to the technical field of medicine, in particular to a gas collecting device comprising an elastic bag body and used for a pathology department.

Background

Many diseases can be diagnosed by analyzing the concentration of certain substances (or viruses, bacteria) in the gas exhaled by the patient, for example, by analyzing the type of the exhaled virus, whether the patient has pneumonia, tuberculosis, etc. can be diagnosed.

In order to collect the gas exhaled by the patient, a gas collecting device has appeared in the prior art, which comprises a flow guiding device and a collecting bag, wherein the flow guiding device has an inlet and an outlet which are directly communicated with each other, the outlet is connected with the collecting bag, and the patient exhales to the flow guiding device through the inlet, so that the gas is accommodated in the collecting bag through the outlet.

However, due to the different exhaled gas pressures of different patients (or different periods of an exhalation process of the same patient), the amount of gas collected by the patient per unit time during the exhalation process by using the above-mentioned gas collecting device in the prior art is different, which may affect the test result of the substances (or viruses and bacteria) in the gas to some extent.

To solve the above problems, chinese patent No. 201080016955.6 provides a gas flow rate adjusting device, the device includes a housing assembly, an inlet tube assembly, and a biasing device, which is a spring, a constant pressure chamber defined by the inlet tube assembly and a distal plate is formed within a main housing of the housing assembly, as the pressure exhaled by the patient increases, the inlet tube assembly moves proximally, the constant pressure chamber increases to accommodate excess gas entering the constant pressure chamber, the inlet tube assembly moves proximally so that the inlet end closes asymptotically, such that the rate of gas entering the constant pressure chamber is reduced, such that the pressure in the constant pressure chamber does not increase or decrease in concert with the pressure of the gas exhaled by the patient, the pressure range in the constant pressure cavity is smaller than the pressure variation range of the gas exhaled by the patient, so that the variation range of the flow rate of the gas exhausted through the gas outlet is small.

According to the above, although the chinese patent can reduce the pressure variation range of the gas, the pressure variation range of the gas discharged from the gas flow rate adjusting apparatus is still large, and the variation range of the gas flow rate is still large.

Disclosure of Invention

In view of the above technical problems in the prior art, embodiments of the present invention provide a gas collecting apparatus for a pathology department including an elastic bag body.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

a gas collecting device for a pathology department including an elastic bag body, comprising: a collection bag and a flow guide device;

the collecting bag comprises a bag body and a necking combined on the bag body;

the flow guide device comprises:

the gas inlet and the gas outlet are formed between the shell and the gas outlet, and a gas flow passage for gas to pass through is formed between the gas inlet and the gas outlet;

a stator fixed in the housing;

a rotor, which, together with the stator and the housing, forms a first pressure comparison chamber and a second pressure comparison chamber, the first pressure comparison chamber being in communication with the gas channel,

a biasing mechanism for providing a force to rotate the rotor in a first direction;

a throttle mechanism connected to the gas outlet so that the gas flowing out from the gas outlet passes through the throttle mechanism, a throat being connected to the throttle mechanism, wherein:

the flow cross section defining the flow rate of gas entering the gas flow passage via the gas inlet increases when the rotor rotates in a first direction, and the flow cross section defining the gas flow passage entering the gas flow passage via the gas inlet decreases when the rotor rotates in a second direction opposite to the first direction;

a pressure comparison flow passage is formed between the throttling mechanism and the second pressure comparison cavity.

Preferably, the housing comprises a cylindrical body and a cover body which is covered on the body in a sealing manner, and a mandrel is arranged in the middle of the inside of the body;

the stator is in a sector shape extending in the circumferential direction and is fixed in the body;

the rotor comprises a sleeve-shaped main body and a sector combined on the sleeve-shaped main body, the sleeve-shaped main body is sleeved on the mandrel, and the two circumferential ends of the sector and the two circumferential ends of the stator respectively define the first pressure comparison cavity and the second pressure comparison cavity;

the biasing mechanism comprises a torsion spring, the torsion spring is sleeved on the mandrel, and two ends of the torsion spring are respectively connected with the mandrel and the sleeve-shaped main body.

Preferably, a fan-shaped buffer cavity is formed on the fan-shaped body, the buffer cavity has a first cavity wall and a second cavity wall in the circumferential direction, the first cavity wall is close to the second pressure comparison cavity, and the second cavity wall is close to the first pressure comparison cavity; wherein:

the second chamber wall and the gas inlet together define the flow cross section.

Preferably, the throttling mechanism comprises a first cylinder and a second cylinder which are butted and coaxially arranged; a plurality of first pore passages which are axially communicated and circumferentially and uniformly distributed are formed in the first column body; a plurality of axially-through and axially-uniformly-distributed second pore passages which are in one-to-one correspondence with the first pore passages are formed in the second column body, and the first pore passages and the corresponding second pore passages have overlapping regions at the butt joint positions; wherein:

a first connecting frame is arranged on the body corresponding to the air outlet;

a second connecting frame is arranged on the second column body; the first connecting frame is connected with the second connecting frame, so that the first cylinder is positioned between the body and the second cylinder and can rotate relative to the second cylinder; wherein:

the necking is connected to one end, far away from the butt joint end, of the second column body;

the first cylinder can change the overlapping area of the first duct and the second duct at the butt joint through rotation.

Preferably, the stator and the rotor are provided hollow inside; wherein:

the rotor is internally provided with a first conduit, the first conduit penetrates through the end face of the rotor, which is used for limiting the first pressure ratio cavity, and the wall of the second cavity, so that the first pressure ratio cavity is communicated with the buffer cavity, and an inner hole of the first conduit forms the gas flow channel.

Preferably, the pressure ratio flow passage is formed by an inner hole of a second conduit, the second conduit includes an outer tube and an inner tube, the inner tube is formed inside the stator, and one end of the inner tube penetrates through the second pressure ratio cavity, and the other end of the inner tube penetrates through the outside of the body and is connected with one end of the outer tube; wherein:

one end of the first column body, which is far away from the butt joint end, is provided with a cavity, and the other end of the outer tube is communicated to the cavity.

Preferably, the air inlet and the air outlet are located on opposite sides of the body.

8. The gas collecting device for clinical department including elastic bag according to claim 4, further comprising an inlet connection nozzle and an outlet connection nozzle; wherein:

the air inlet connecting nozzle is integrally formed on the body; the air outlet connecting nozzle is combined with one end of the first column body, which is far away from the butt joint end, and the necking is sleeved on the air outlet connecting nozzle;

the air inlet connecting nozzle is provided with a connector, and the free end of the connector expands outwards to form a matching part matched with the lips of a patient.

Preferably, a plurality of annular bulges are arranged on the outer peripheral surface of the air outlet connecting nozzle.

Compared with the prior art, the gas collecting device for the pathology department, which comprises the elastic bag body, has the beneficial effects that: since the difference between the pressure of the gas outlet before entering the restriction and the pressure of the gas flowing out of the restriction remains substantially constant, and since the restriction defined by the restriction does not change during exhalation by the patient, the flow of gas through the restriction remains substantially constant, i.e.: the flow rate of the air flow flowing out of the throttling mechanism and into the bag body is kept substantially constant.

Drawings

Fig. 1 is a front view of a gas collecting apparatus for pathology department including an elastic bag body according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a diagram illustrating a usage state of the gas collecting apparatus for pathology department including the elastic bag according to the embodiment of the present invention.

Fig. 4 is an enlarged view of a portion B of fig. 3.

Fig. 5 is an enlarged view of a portion C of fig. 3.

In the figure:

10-a housing; 11-a body; 12-a cover body; 13-an air inlet; 14-an air outlet; 15-a mandrel; 20-a stator; 21-a second conduit; 211-an inner tube; 212-an outer tube; 30-a rotor; 31-a quadrant; 311-a first conduit; 312-a buffer chamber; 3121-first lumen wall; 3122-second chamber wall; 32-a sleeve-like body; 41-first pressure ratio to cavity; 42-second pressure ratio to cavity; 43-a gas flow channel; 44-pressure ratio versus flow channel; 50-a biasing mechanism; 51-an air inlet connection nozzle; 52-air outlet connecting nozzle; 60-collecting bag; 61-bag body; 62-necking; 70-a rivet; 80-a throttle mechanism; 81-a first cylinder; 811-a first tunnel; 82-a second cylinder; 821-a second duct; 822-a cavity; 83-first connecting rack; 84-second connecting frame.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 5, the embodiment of the present invention discloses a gas collecting apparatus for pathology department comprising an elastic bag body for collecting gas exhaled from a patient so as to detect the content of each substance (or, virus, bacteria) in the exhaled gas to diagnose what kind of disease and the severity of the disease the patient suffers from. The gas collecting device comprises a collecting bag 60 and a flow guiding device, in the invention, the collecting bag 60 comprises a bag body 61 and a necking 62 integrally formed on the bag body 61, and it should be noted that: the bag 61 is made of an elastic material, such as an elastic rubber material, and when gas enters the bag 61 through the throat 62, the bag 61 is elastically deformed to expand, and the larger the expanded volume, the larger the degree of elastic deformation, so that the pressure of the gas in the bag 61 increases with the increase in the volume of the bag 61, that is, the pressure of the gas in the bag 61 increases with the increase in the amount of the collected gas, as the balloon inflates. As shown in fig. 1 and 2, a closed cavity is formed in the housing 10, the housing 10 is formed with an inlet 13 and an outlet 14, the inlet 13 and the outlet 14 are formed thereon, and a gas flow path 43 for the exhaled gas of the patient to pass through is formed between the inlet 13 and the outlet 14. The stator 20 is disposed in the sealed cavity and occupies a space of the sealed cavity, and the stator 20 is fixedly connected to the housing 10 by a fastening member such as a rivet 70. The rotor 30 is also disposed in the sealed chamber, and can rotate relative to the stator 20, and the sealed chamber is divided into a first pressure comparison chamber 41 and a second pressure comparison chamber 42 by the stator 20, and the first pressure comparison chamber 41 is communicated with the gas flow channel 43, so that when the patient exhales gas through the gas inlet 13, the gas can enter the first pressure comparison chamber 41 through the gas flow channel 43, that is, at the beginning stage of gas storage, the gas enters the first pressure comparison chamber 41 through the gas flow channel 43, and in the whole process of gas storage, the first pressure comparison chamber 41 is in accordance with (or is called as, substantially equal to) the gas pressure of the gas flow channel 43. The biasing mechanism 50 is used to provide a force for rotation of the rotor 30 in a first direction. The throttling mechanism 80 is connected to the gas outlet 14 so that the gas flowing out of the gas outlet 14 passes through the throttling mechanism 80, and a pressure ratio flow passage 44 is formed between the throttling mechanism 80 and the second pressure ratio chamber 42. In the present invention, the throttle mechanism 80 is such that: the throttling mechanism 80 provides a throttling opening, when the gas flowing out from the gas outlet 14 passes through the throttling opening, the pressure of the gas is reduced, that is, the pressure of the gas flowing out from the gas outlet 14 when the gas does not pass through the throttling mechanism 80 is larger than the pressure of the gas after the gas passes through the throttling mechanism 80; in the present invention, since the throttling mechanism 80 is communicated with the second pressure ratio chamber 42 through the pressure ratio flow passage 44, so that the pressure of the gas in the second pressure ratio chamber 42 is equal to (or substantially equal to) the pressure of the gas flowing out through the throttling mechanism 80, and since the collecting bag 60 is communicated with the throttling mechanism 80, the pressure of the gas in the bag body 61 is equal to (or substantially equal to) the pressure of the gas flowing out through the throttling mechanism 80, and therefore, the pressure of the gas in the second pressure ratio chamber 42 is equal to (or substantially equal to) the pressure of the gas in the bag body 61 in real time. In the present invention, the flow cross section S1 of the gas flow rate entering the gas channel 43 through the gas inlet 13 is changed by the rotation of the rotor 30 (the flow cross section is a parameter for limiting the gas flow rate and is a known concept in the field of fluidics and will not be described in detail herein) (actually, the pressure of the gas in the gas inlet 13 decreases after passing through the flow cross section, that is, the pressure P0 of the gas before passing through the flow cross section S1 is higher than the pressure P1 of the gas after passing through the flow cross section S1). Specifically, the manner of varying the through-flow section S1 is: when the rotor 30 rotates in the first direction, the flow cross section S1 defining the flow rate of the gas entering the gas channel 43 via the gas inlet 13 increases, and when the rotor 30 rotates in the second direction opposite to the first direction, the flow cross section S1 defining the gas channel 43 entering the gas channel 43 via the gas inlet 13 decreases. In the present invention, the acting direction of the gas in the first pressure ratio chamber 41 on the rotor 30 is the same as the second direction, and the acting direction of the gas in the second pressure ratio chamber 42 on the rotor 30 is the same as the first direction; the area of action of the gas in the first pressure ratio chamber 41 on the rotor 30 is substantially equal to the area of action of the gas in the second pressure ratio chamber 42 on the rotor 30.

It should be noted that: the following mechanical properties were selected as the biasing mechanism 50: when the shaft is rotated in both directions such that the flow cross section S1 switches between 0 and a maximum value, the force of the biasing mechanism 50 on the rotor 30 remains substantially constant or varies very little.

The advantages of the gas collecting device provided by the above embodiments are described in detail below:

when the collecting device is not in use, as shown in fig. 1, due to the biasing mechanism 50 causing the flow cross-section S1 to be in a larger area, when the patient starts to exhale, as shown in fig. 3 to 5, the gas rapidly enters the first pressure comparison chamber 41 through the gas flow passage 43, and simultaneously flows through the orifice of the throttling mechanism 80 through the gas outlet 14, and flows out of the orifice into the bag body 61, and a part of the gas enters the second pressure comparison chamber 42 through the pressure comparison flow passage 44, when the first pressure ratio chamber 41 and the second pressure ratio chamber 42 are filled with gas, the rotor 30 rotates to a certain angle and does not rotate any more, and the flow cross section S1 is maintained at a constant value, and at this time, the force F2 of the gas in the first pressure ratio chamber 41 on the rotor 30 is equal to the combined force F3 of the gas in the second pressure ratio chamber 42 on the rotor 30 and the force F4 of the bias actuator on the rotor 30.

As the pressure of the patient's exhalation increases, the gas flow passage 43 and thus the first pressure ratio increases relative to the pressure P1 in chamber 41, although the second pressure ratio also increases relative to the pressure P2 in chamber 42, but by an amount less than the first pressure ratio relative to the pressure in chamber 41, which causes: the acting force of the gas in the first pressure ratio chamber 41 on the rotor 30 is greater than the sum of the acting force of the gas in the second pressure ratio chamber 42 on the rotor 30 and the acting force of the bias actuating mechanism on the rotor 30, the rotor 30 rotates in the second direction, the flow cross section S1 is reduced, so that the pressure in the first pressure ratio chamber 41 is reduced, and the stress on the rotor 30 reaches the new balance, namely: the force F2 of the gas in the first pressure ratio chamber 41 on the rotor 30 is again equal to the combined force F3 of the gas in the second pressure ratio chamber 42 on the rotor 30 and the force F4 of the bias actuator on the rotor 30.

When the pressure at the patient's exhalation is reduced, the gas flow passage 43 and the first pressure ratio are reduced to the pressure in the chamber 41, although the second pressure ratio is also reduced to the pressure in the chamber 42, but by an amount less than the first pressure ratio to the pressure in the chamber 41, which results in: the acting force of the gas in the first pressure ratio cavity 41 on the rotor 30 is smaller than the sum of the acting force of the gas in the second pressure ratio cavity 42 on the rotor 30 and the acting force of the bias actuating mechanism on the rotor 30, the rotor 30 rotates towards the first direction, the through flow section is increased, and therefore the pressure in the first pressure ratio cavity 41 is increased, and the stress on the rotor 30 reaches a new balance, namely: the force F2 of the gas in the first pressure ratio chamber 41 on the rotor 30 is again equal to the combined force F3 of the gas in the second pressure ratio chamber 42 on the rotor 30 and the force F4 of the bias actuator on the rotor 30.

Importantly, the method comprises the following steps: the volume of the bag body 61 is expanded continuously during the process of continuously collecting the gas, and the pressure of the gas in the bag body 61 is also increased continuously, however, the gas collecting device provided by the invention ensures that the flow rate of the gas flowing into the bag body 61 is not influenced by the increase of the pressure of the gas in the bag body 61.

The specific reasons are that: although the increase in the pressure of the gas in the pockets 61 causes the rotor 30 to rotate constantly, and the corresponding through-flow section S1 to vary constantly, however, since the force F2 of the gas in the first pressure ratio chamber 41 on the rotor 30 is always equal to the resultant force F3 of the gas in the second pressure ratio chamber 42 on the rotor 30 and the force F4 of the bias actuator on the rotor 30, and according to the above, even if the rotor 30 is in a different rotation angle state, the force of the biasing mechanism 50 on the rotor 30 is kept substantially constant, in this way, the pressure difference of the action of the gas in the first pressure ratio chamber 41 and the second pressure ratio chamber 42 on the rotor 30 is always basically unchanged, since the areas of action of the gas in the two chambers on the rotor 30 are the same, it follows that the difference between the pressure P1 of the gas in the first pressure ratio chamber 41 and the pressure P2 of the gas in the second pressure ratio chamber 42 remains substantially constant. And because the second pressure ratio is the same as the pressure of the gas in the bag 61 with the pressure of the gas in the chamber 42, the difference between the pressure P1 before the gas outlet 14 enters the throttling mechanism 80 and the pressure P2 of the gas flowing out from the throttling opening is kept substantially constant.

It should be noted that: according to the fluid theory, for a flow channel with a defined throughflow cross section, the flow rate of the gas flow through the flow channel is constant, while the pressure difference across it is constant. For a throttle mechanism 80 having a throttle orifice, the cross-sectional area of the orifice is the area of the flow cross-section S2 that defines the flow rate of gas therethrough, and when the cross-sectional area of the orifice is determined and the pressure differential across it is also constant, the flow rate of gas therethrough is also constant.

As may be appreciated from the above discussion, because the difference between pressure P1 before gas outlet 14 enters throttling mechanism 80 and pressure P2 of the gas exiting the orifice remains substantially constant, and because the orifice defined by throttling mechanism 80 does not change during patient exhalation, the flow of gas through the orifice remains substantially constant, i.e.: the flow rate of the air flow flowing out of the throttle mechanism 80 and into the bag body 61 is kept substantially constant, thereby solving the problems mentioned in the background art.

According to the above, the present invention provides two pressure comparison chambers, and compares the gas flowing out from the throttling mechanism 80 into the second pressure comparison chamber 42 with the gas pressure in the first pressure comparison chamber 41, so that the difference between the gas pressure before entering the throttling mechanism 80 and the gas pressure flowing out from the throttling mechanism 80 is kept substantially constant, and thus the flow rate of the gas flowing into the bag 61 is kept substantially constant during the exhalation of the patient.

The gas collecting device provided by the invention ensures that the flow of the gas entering the bag body 61 is not changed under the influence of the gas pressure in the bag body 61.

In a preferred embodiment of the present invention, as shown in fig. 1 to 5, the housing 10 includes a cylindrical body 11 and a cover 12 covering the body 11, wherein a central portion inside the body 11 is provided with a mandrel 15; the stator 20 is in a sector shape extending in the circumferential direction, and the stator 20 is fixed in the body 11; the rotor 30 comprises a sleeve-shaped main body 32 and a sector 31 combined on the sleeve-shaped main body 32, the sleeve-shaped main body 32 is sleeved on the mandrel 15, and two ends of the sector 31 in the circumferential direction and two ends of the stator 20 in the circumferential direction respectively define a first pressure comparison cavity 41 and a second pressure comparison cavity 42; the biasing mechanism 50 includes a torsion spring, which is sleeved on the spindle 15, and two ends of the torsion spring are respectively connected with the spindle 15 and the sleeve-shaped main body 32. Specifically, a fan-shaped buffer cavity 312 is formed in the fan-shaped body 31, the buffer cavity 312 has a first cavity wall 3121 and a second cavity wall 3122 in the circumferential direction, the first cavity wall 3121 is close to the second pressure comparison cavity 42, and the second cavity wall 3122 is close to the first pressure comparison cavity 41; wherein: the second cavity wall 3122 defines a flow cross section together with the air inlet 13. Specifically, the stator 20 and the rotor 30 are provided hollow inside; wherein: the rotor 30 is provided with a first conduit 311 inside, the first conduit 311 penetrates through an end surface of the rotor 30 for defining the first pressure ratio chamber 41 and the second chamber wall 3122, so that the first pressure ratio chamber 41 is communicated with the buffer chamber 312, and an inner hole of the first conduit 311 forms the gas flow passage 43. The pressure ratio flow passage 44 is formed by an inner hole of the second conduit 21, the second conduit 21 includes an outer tube 212 and an inner tube 211, the inner tube 211 is formed inside the stator 20, and one end of the inner tube 211 penetrates through the second pressure ratio cavity 42, and the other end penetrates through the outside of the body 11 and is connected with one end of the outer tube 212; and the other end of the outer tube 212 communicates with the gas flow outlet of the throttle mechanism 80.

It should be noted that: the torsion spring with the lowest torsion coefficient is selected as the torsion spring, and the torsion deformation degree of the torsion spring is enabled to be as large as possible, so that the acting force of the torsion spring on the rotor 30 is basically kept unchanged when the rotor 30 rotates to enable the through-flow section to be switched between 0 and the maximum value.

The advantages of the above embodiment are:

1. the first pressure ratio chamber 41 and the second pressure ratio chamber 42 are formed at both ends of the rotor 30 so that the forces of the gases in the two chambers against the rotor 30 are all used for calculation of the balance of the forces in the circumferential direction.

2. On the sector 3131 there is provided a buffer cavity 312 which, on the one hand, provides a certain buffer effect on the gas coming from the inlet port 13 and, on the other hand, the second cavity wall 3122 with the inlet port 13 is able to define a through-flow cross-section, making it possible to define the through-flow cross-section by rotation of the rotor 30.

3. The rotor 30 is arranged in a hollow structure, so that the moment of inertia of the rotor 30 is reduced as much as possible, the rotor 30 rotates more quickly, and the adjustment of the through-flow cross section is more sensitive to the reaction of the exhaled air.

5. The duct penetrates through the rotor 30 and the stator 20, so that the rotor 30 can be controlled by directly flowing the air flow for controlling the rotation of the rotor 30 in the shell 10, and the device has a reduced volume and a compact structure.

In a preferred embodiment of the present invention, the throttling mechanism 80 comprises a first cylinder 81 and a second cylinder 82 which are butted and coaxially arranged; a plurality of first hole channels 811 which are axially communicated and circumferentially and uniformly distributed are formed in the first column 81; a plurality of axially through and axially uniformly distributed second hole passages 821 which are in one-to-one correspondence with the plurality of first hole passages 811 are formed in the second cylinder 82, and the first hole passages 811 and the corresponding second hole passages 821 have overlapping regions at the butt joint positions; wherein: a first connecting frame 83 is arranged on the body 11 corresponding to the position of the air outlet 14; the second connecting frame 84 is arranged on the second cylinder 82; the first connecting frame 83 is connected with the second connecting frame 84 so that the first cylinder 81 is positioned between the body 11 and the second cylinder 82 and the first cylinder 81 can rotate relative to the second cylinder 82; wherein: the throat 62 is connected to an end of the second post 82 distal from the mating end; the first cylinder 81 can change the overlapping area of the first hole 811 and the second hole 821 at the joint by rotating; the first cylinder 81 has a cavity 822 at one end thereof away from the docking end, and the other end of the outer tube 212 is connected to the cavity 822.

In the above embodiment: the overlap area is in fact the flow cross section S2 which defines the gas flow through the throttle means 80, the size of this overlap area determining the amount of gas collected by the body of the collecting bag 60 per unit of time. Namely: the amount of collected gas per unit time decreases when the overlapping area decreases, and increases when the overlapping area increases.

The advantages of the above embodiment are:

the area of the overlapping area is adjusted for patients with different vital capacities, and when the gas collecting device is used by a patient with a large vital capacity, the area of the overlapping area is adjusted to be small by rotating the first cylinder 81, so that the amount of gas entering the bag body 61 per unit time is small in the whole expiration process of the patient, and the whole expiration time is long due to the large vital capacity of the patient; when a patient with small lung capacity uses the gas collecting device of the present invention, the area of the overlapping area is increased by rotating the first cylinder 81, so that the amount of gas entering the bag 61 per unit time is large during the whole exhalation process of the patient, and the whole exhalation time is short because the lung capacity of the patient is small, so that the total amount of the collected gas can be always kept uniform by adjusting the area of the overlapping area, and thus the amount of the collected gas is not insufficient or excessive due to the difference of the lung capacity of different patients.

In a preferred embodiment of the present invention, the air inlet 13 and the air outlet 14 are located on opposite sides of the body 11.

In a preferred embodiment of the present invention, further comprises an inlet connection nozzle 51 and an outlet connection nozzle 52; wherein: the air inlet connecting nozzle 51 is integrally formed on the body 11; the air outlet connector 52 is combined with one end of the first column 81 far away from the butt joint end, and the necking 62 is sleeved on the air outlet connector 52; the inlet connector 51 is provided with a connector, the free end of which is flared to form a mating portion for mating with the lips of a patient. Preferably, the outer circumferential surface of the outlet connection nipple 52 is provided with a plurality of annular ridges for improving airtightness between the throat 62 and the outlet connection nipple 52.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. A gas collecting device for a pathology department, comprising an elastic bag body, characterized by comprising: a collection bag and a flow guide device;

the collecting bag comprises a bag body and a necking combined on the bag body;

the flow guide device comprises:

a stator fixed in the housing;

2. The gas collecting device for clinical department including elastic bag according to claim 1, wherein said case includes a cylindrical body and a lid body covering said body, and a central part in said body is provided with a mandrel;

3. The gas collecting device for clinical department including elastic bag body according to claim 2, wherein said fan-shaped body is formed with a fan-shaped buffer chamber having a first chamber wall and a second chamber wall in the circumferential direction, said first chamber wall is close to said second pressure comparison chamber, said second chamber wall is close to said first pressure comparison chamber; wherein:

4. The gas collecting device for clinical department including elastic bag body as claimed in claim 3, wherein said throttling mechanism comprises a first column body and a second column body which are butt jointed and coaxially arranged; a plurality of first pore passages which are axially communicated and circumferentially and uniformly distributed are formed in the first column body; a plurality of axially-through and axially-uniformly-distributed second pore passages which are in one-to-one correspondence with the first pore passages are formed in the second column body, and the first pore passages and the corresponding second pore passages have overlapping regions at the butt joint positions; wherein:

5. The gas collecting apparatus for clinical department including elastic bag according to claim 4, wherein the stator and the inside of the rotor are provided to be hollow; wherein:

6. The gas collecting apparatus for clinical department including the elastic bag body according to claim 4, wherein,

the pressure ratio flow passage is formed by an inner hole of a second guide pipe, the second guide pipe comprises an outer pipe and an inner pipe, the inner pipe is formed inside the stator, one end of the inner pipe penetrates through the second pressure ratio cavity, and the other end of the inner pipe penetrates through the outer part of the body and is connected with one end of the outer pipe; wherein:

7. The gas collecting device for clinical department including elastic bag body as set forth in claim 2, wherein said gas inlet and said gas outlet are located at opposite sides of said body.

9. The gas collecting apparatus for clinical department including elastic bag according to claim 8, wherein a plurality of ring-shaped ridges are provided on the outer peripheral surface of said air outlet connection nozzle.