CN113712602A - Suction device - Google Patents

Abstract

The invention provides a suction device, which relates to the technical field of medical equipment and comprises a test tube, a sealing plug, a suction tube, a first valve and a needle head; the sealing plug is used for sealing the pipe orifice of the test tube, and the interior of the test tube is in a negative pressure state; one end of the suction tube is connected with the needle head, and the other end of the suction tube penetrates through the sealing plug and is positioned in the test tube; first valve is established on the suction tube, and first valve is located the test tube outside. According to the suction device provided by the invention, the test tube is arranged into the sealed tube body, structures such as the piston rod and the like are not arranged, the interior of the suction device is in a negative pressure state, and when puncture suction is carried out, only one medical staff is needed to control the connection or the disconnection of the suction tube; when the suction tube intercommunication, because the inside negative pressure state that is of test tube, under the effect of pressure difference, the test tube can independently extract tissue liquid such as testicle, single suction that can realize testicle tissue liquid, the protection of certain degree patient's internal fear and worry have improved patient's comfort level, improve medical personnel's work efficiency.

Description

Suction device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a suction device.

Background

In the field of male health treatment, when a male has a sterile symptom, testicle puncture needs to be performed in an outpatient service, and a testicle tissue suction device is used for extracting testicle tissue in a testicle so as to better assist a doctor in disease detection and treatment.

The injection tube is adopted in most of the existing testis suction devices, the needle head is connected to the front end of the injection tube, the needle head is inserted into a testis of a patient, a piston rod of the injection tube is pulled to enable the interior of the injection tube to be in a negative pressure state, and tissue fluid is extracted from the testis of the patient.

However, when the existing syringe is extracted, two hands are needed for operation, one hand holds the syringe body, and the other hand gradually pulls the piston rod; meanwhile, another person is required to hold the needle and the testis of the patient, so that the puncture of the testis is completed by cooperation of the two persons. The negative pressure is large when the injection tube is pulled, so that the medical staff is inconvenient to apply force and easy to shake, heavier burden is caused to the psychological fear of patients, and the sense of shame and uneasiness of the insides of the patients are increased by double operation; meanwhile, the extraction speed is low, so that the working efficiency is low, the exposure time of the testis of the patient is long, the sensitive feeling and uneasiness of the inner heart of the patient are increased, the medical time of the patient is prolonged, and the workload of medical staff is increased.

Disclosure of Invention

The invention provides a suction device, which is used for solving the defects of inconvenient operation, requirement of double-person operation, low suction speed and low working efficiency of the suction device in the prior art, and realizes the suction device which is operated by one person and is convenient to operate.

The invention provides a suction device, which comprises a test tube, a sealing plug, a suction tube, a first valve and a needle head; the sealing plug is used for sealing the pipe orifice of the test tube, and the interior of the test tube is in a negative pressure state; one end of the suction tube is connected with the needle head, and the other end of the suction tube penetrates through the sealing plug and is positioned in the test tube; first valve is established on the suction tube, first valve is located the test tube is outside.

According to the suction device provided by the invention, the first valve comprises a first valve body and a second valve body, the first valve body and the second valve body are rotatably connected through a rotating shaft, the first valve body is provided with a first pipe orifice and a first through hole which are mutually communicated, and the second valve body is provided with a second pipe orifice and a second through hole which are mutually communicated;

the first through hole and the second through hole are in a communicated or non-communicated state when the first valve body and the second valve body rotate to different angles relatively;

an annular sealing element is arranged between the first valve body and the second valve body, and the first through hole and the second through hole are both located in an annular ring of the annular sealing element.

According to the suction device provided by the invention, the first valve body is provided with the circular groove, the second valve body is cylindrical, part or all of the second valve body is arranged in the circular groove and is rotationally connected with the second valve body through the rotating shaft, and the annular sealing element is arranged between the inner wall surface of the circular groove and the second valve body.

According to the suction device provided by the invention, the first through holes are multiple, and the multiple first through holes are arranged at intervals along the circumferential direction of the rotating shaft;

and/or the second through holes are multiple and are arranged at intervals along the circumferential direction of the rotating shaft.

According to the pumping device provided by the invention, the first valve 4 further comprises a limiting piece, and the limiting piece is used for limiting the relative rotation of the first valve body and the second valve body within a preset angle range.

According to the suction device provided by the invention, a protection mechanism is connected on the suction pipe 3 in series, and the protection mechanism comprises an expanding pipe, a connecting pipe and a diameter returning pipe which are sequentially connected in series, and further comprises a ball blocking and an elastic piece;

the diameter expanding pipe is in a circular table shape with the diameter gradually increasing along the direction from the diameter expanding pipe to the connecting pipe, and the diameter returning pipe is in a circular table shape with the diameter gradually decreasing along the direction from the connecting pipe to the diameter returning pipe;

the blocking ball is installed in the connecting pipe through the elastic piece, is suitable for moving in the connecting pipe, is suitable for blocking the expanding pipe when contacting with the inner wall surface of the expanding pipe, and is suitable for blocking the reducing pipe when contacting with the inner wall surface of the reducing pipe.

According to the suction device provided by the invention, the elastic piece comprises an elastic rope, a tension spring or an elastic sheet.

According to the suction device provided by the invention, the suction device further comprises a negative pressure pipe, one end of the negative pressure pipe penetrates through the sealing plug and is positioned in the test tube, and the other end of the negative pressure pipe is connected with the pneumatic quick plug.

According to the suction device provided by the invention, the negative pressure pipe is provided with a second valve, and the second valve is positioned outside the test tube.

According to the suction device provided by the invention, the anti-skid part is arranged outside the test tube.

According to the suction device provided by the invention, the test tube is arranged into the sealed tube body, the structures such as the piston rod and the like are not arranged, the test tube is in a negative pressure state, when puncture suction is carried out through the suction device, only one medical care personnel is needed, one hand is used for holding the needle head stably, the other hand is used for holding the test tube tightly through the palm and the little finger, and the thumb and the index finger or the middle finger are used for controlling the first valve so as to control the connection or the disconnection of the suction tube. When the suction tube intercommunication, because the inside negative pressure state that is of test tube, under the effect of pressure differential, the test tube can independently extract tissue liquid such as testicle, single suction that can realize testicle tissue liquid. Moreover, the medical staff can adjust the communication and disconnection of the suction tube only by adjusting the first valve, the operation is convenient and simple, too much force does not need to be applied, the suction speed can be adjusted through the first valve, and the suction speed is better controlled.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of a suction device provided by the present invention;

FIG. 2 is a schematic view of a first valve from a first perspective provided by the present invention;

FIG. 3 is a schematic view of a second perspective of the first valve provided by the present invention;

FIG. 4 is a general schematic view of the protection mechanism provided by the present invention;

fig. 5 is an exploded view of the protection mechanism provided by the present invention.

Reference numerals:

1: a test tube;

2: a sealing plug;

3: a suction tube;

4: first valve 41: a first valve body; 411: a first nozzle;

412: a first through hole; 413: a circular groove; 42: a second valve body;

421: a second orifice; 422: a second through hole; 43: a rotating shaft;

44: an annular seal; 441: an annular ring; 45: a first stopper;

46: a second limiting block; 47: a third limiting block;

5: a needle head;

6: a protection mechanism; 61: expanding the diameter of the pipe; 62: a connecting pipe;

63: a diameter returning pipe; 64: blocking the ball; 65: an elastic member;

7: a negative pressure tube; 71: a pneumatic quick plug; 72: a second valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "first" and "second", etc. are numbers that are used for clearly illustrating the product parts and do not represent any substantial difference. "upper", "lower", "inner", and the like are used merely to indicate relative positional relationships, and when the absolute position of a described object is changed, the relative positional relationships may also be changed accordingly. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the description "in the range of …" in the present invention includes both end values. Such as "in the range of 10 to 20," includes both ends of the range of 10 and 20.

It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. Specific meanings of the above terms in the embodiments of the invention will be understood to those of ordinary skill in the art in specific cases.

The suction device of the present invention will be described below with reference to fig. 1 to 5.

The embodiment provides a suction device, which comprises a test tube 1, a sealing plug 2, a suction tube 3, a first valve 4 and a needle 5.

Specifically, the sealing plug 2 is used for sealing the pipe orifice of the test tube 1, and the interior of the test tube 1 is in a negative pressure state; preferably, the sealing plug 2 is a medical rubber plug or a medical plastic plug, and the test tube 1 is made of medical glass or medical plastic and the like. When the sealing plug 2 is a medical rubber plug, a rubber plug like the bottleneck of an infusion bottle can be adopted, and pipelines such as a suction tube 3 and the like can be inserted into and penetrate through the sealing plug 2 through a structure similar to a needle head; when the sealing plug 2 is made of medical plastic materials, the sealing plug 2 is connected with the suction pipe 3 in a sealing mode or is integrally formed, and the sealing performance of the sealing plug 2 is guaranteed.

One end of the suction tube 3 is connected with the needle head 5, and the other end passes through the sealing plug 2 and is positioned in the test tube 1; preferably, the needle head 5 can adopt a needle head structure such as a scalp needle.

The first valve 4 is arranged on the suction pipe 3, and the first valve 4 is positioned outside the test tube 1; when the first valve 4 is closed, the suction pipe 3 is in a blocking state; when first valve 4 was opened, suction tube 3 intercommunication, because test tube 1 is inside to be the negative pressure state this moment, under the effect of pressure differential, test tube 1 extraction testicle etc. tissue liquid.

This embodiment is through setting test tube 1 to sealed body, does not set up piston rod isotructure, and when suction device carried out the puncture suction through this embodiment, only need a medical personnel, the steady syringe needle 5 of a hand, another hand is through palm and little finger grip test tube 1, controls first valve 4 through thumb and forefinger or middle finger to control suction tube 3 communicates or blocks. When 3 intercommunications of suction tube, because test tube 1 is inside to be the negative pressure state, under the effect of pressure differential, test tube 1 can independently extract tissue liquid such as testicle, single suction that can realize testicle tissue liquid. Moreover, the medical staff can adjust the connection and disconnection of the suction tube 3 only by adjusting the first valve 4, the operation is convenient and simple, too much force does not need to be applied, the suction speed can be adjusted through the first valve 4, and the suction speed is better controlled.

In particular, the first valve 4 has various embodiments, and all valves capable of achieving the functions of intercepting and throttling and adjusting the on-off and the flow of the suction pipe 3 fall into the protection range of the suction device defined by the invention.

In particular, the present embodiment provides a first valve 4 that is simple in structure and easy to operate. Referring to fig. 2 and 3, the first valve 4 includes a first valve body 41 and a second valve body 42, the first valve body 41 is rotatably connected to the second valve body 42 through a rotating shaft 43, the first valve body 41 is provided with a first pipe opening 411 and a first through hole 412 which are communicated with each other, and the second valve body 42 is provided with a second pipe opening 421 and a second through hole 422 which are communicated with each other; the first through hole 412 and the second through hole 422 are in a communicating state or a non-communicating state when the first valve body 41 and the second valve body 42 relatively rotate to different angles; an annular sealing member 44 is disposed between the first valve body 41 and the second valve body 42, and the first through hole 412 and the second through hole 422 are both located in an annular ring 441 of the annular sealing member 44.

The shapes of the first valve element 41 and the second valve element 42 are not limited to a disk shape, and may be various configurations such as a square plate and a triangular plate.

The first valve body 41 and the second valve body 42 have contact surfaces that are matched with and in contact with each other. The first valve body 41 is rotatably connected to the second valve body 42 via a rotating shaft 43, and the rotating shaft 43 is located at the axial center of the second valve body 42. The rotating shaft 43 extends outwards from the first valve body 41 and is partially inserted into the second valve body 42 to form a rotating connection; or the rotating shaft 43 protrudes outward from the second valve body 42 and is partially inserted into the first valve body 41 to form a rotating connection. Preferably, the free end of the rotating shaft 43 is further provided with a snap to limit the axial direction of the first valve body 41 and the second valve body 42 in the assembling manner of the first valve body 41 and the second valve body 42.

Specifically, the first valve body 41 is a hollow structure, a first nozzle 411 of the first valve body is communicated with the first through hole 412, and the first nozzle 411 is connected with a section of the liquid pumping tube 3 connected with the needle 5; the second valve body 42 is a hollow structure, and a second nozzle 421 is communicated with the second through hole 422, and the second nozzle 421 is connected to the liquid extracting tube 3 and connected to one section of the test tube 1. When the first valve body 41 and the second valve body 42 rotate relatively until the first through hole 412 is not communicated with the second through hole 422, the first valve body 41 is in a blocking state; when the first valve body 41 and the second valve body 42 are relatively rotated until the first through hole 412 and the second through hole 422 are communicated, the second valve body 42 is in a communicated state. Further, by controlling the first valve body 41 and the second valve body 42 to rotate continuously, the area of the first through hole 412 and the second through hole 422 communicating with each other is controlled, so as to control the speed of sucking the tissue fluid in the suction tube 3.

Specifically, as shown in fig. 2 and 3, an annular sealing member 44 is disposed between the first valve body 41 and the second valve body 42, and the annular sealing member 44 can be fixed on the first valve body 41 and connected in contact with the second valve body 42; or an annular seal 44 is fixed to the second valve body 42 and is in contact with the first valve body 41. Preferably, the center of the annular sealing member 44 coincides with the center of the first valve body 41 or the second valve body 42, and also coincides with the axis of the rotating shaft 43. When the first valve body 41 and the second valve body 42 are relatively rotated, the annular seal 44 is not deformed between the first valve body 41 and the second valve body 42. Specifically, the middle annular ring 441 of the annular seal 44 separates the clearance space between the first and second valve bodies 41, 42 into a sealed space isolated from the external environment, in which the first and second through holes 412, 422 are located to prevent leakage of interstitial fluid.

Preferably, there are a plurality of annular sealing elements 44, the annular sealing elements 44 have different sizes and center points coinciding with each other, and the annular sealing elements 44 are arranged at intervals from inside to outside, so as to improve the sealing performance between the first valve body 41 and the second valve body 42.

The suction tube 3 between the second valve body 42 and the test tube 1 in this embodiment is a hard tube, and preferably, the material of the suction tube 3 is the same as that of the test tube 1. When the medical staff operates, the test tube 1 is held by the palm of a single hand and the little finger, and the first valve body 41 is rotated by the thumb and the index finger or the middle finger in a kneading manner, so that the first valve 4 can be opened and closed.

Preferably, as shown in fig. 3, the first valve body 41 is provided with a circular groove 413, the second valve body 42 is cylindrical, part or all of the second valve body 42 is installed in the circular groove 413 and rotatably connected with the second valve body 42 through a rotating shaft 43, and an annular sealing member 44 is disposed between an inner wall surface of the circular groove 413 and the second valve body 42.

The provision of the circular groove 413 on the one hand enhances the tightness of the connection between the first valve body 41 and the second valve body 42. Said annular seal 44 is preferably provided on the side wall of the circular groove 413 to ensure tightness between the first valve body 41 and the second valve body 42. In addition, the second valve body 42 is wholly or partially located in the circular groove 413, so that the first valve body 41 and the second valve body 42 are prevented from being easily deviated when being connected only through the rotating shaft 43, the rotating shaft 43 is prevented from being broken, and the firmness of connection between the first valve body 41 and the second valve body 42 is improved.

Specifically, as shown in fig. 2 and 3, there are a plurality of first through holes 412, and the plurality of first through holes 412 are arranged at intervals along the circumferential direction of the rotating shaft 43;

and/or, there are a plurality of second through holes 422, and the plurality of second through holes 422 are arranged at intervals along the circumferential direction of the rotating shaft 43.

In this embodiment, the first through hole 412 and the second through hole 422 are provided with a plurality of holes, when the first valve body 41 and the second valve body 42 rotate with each other, only one hole or two or more holes may be present between the first through hole 412 and the second through hole 422 for communication, and by controlling the number of the communication holes between the first through hole 412 and the second through hole 422, the flow rate of the tissue fluid in the first valve 4 can be adjusted, thereby adjusting the pumping speed of the pumping device.

Preferably, the first valve 4 further includes a limiting member, and the limiting member is used for limiting the relative rotation of the first valve body 41 and the second valve body 42 within a predetermined angle range.

As shown in fig. 2 and fig. 3, a first limiting block 45 and a second limiting block 46 are disposed on the first valve body 41, the first limiting block 45 and the second limiting block 46 are disposed at two radial ends of the first valve body 41, and a third limiting block 47 is disposed on the second valve body 42, when the first valve body 41 and the second valve body 42 are mounted in place, the first limiting block 45 and the second limiting block 46 act together to limit the third limiting block 47 to rotate only within a semi-arc range between the first limiting block 45 and the second limiting block 46, so as to control a relative rotation angle between the first valve body 41 and the second valve body 42.

Preferably, when the first through hole 412 and the second through hole 422 are in the two states of communication and blocking, a corresponding mark is made between the first valve body 41 and the second valve body 42 to show the specific state between the first through hole 412 and the second through hole 422. When there are a plurality of first through holes 412 and second through holes 422, and when the first through holes 412 communicate with a different number of second through holes 422, corresponding marks are marked between the first valve body 41 and the second valve body 42 to indicate the flow rate between the first through holes 412 and the second through holes 422.

Preferably, as shown in fig. 4 and 5, the protecting mechanism 6 is connected in series to the suction pipe 3, and the protecting mechanism 6 includes an expanding pipe 61, a connecting pipe 62 and a diameter returning pipe 63 which are connected in series in sequence, and further includes a blocking ball 64 and an elastic member 65;

the expanding pipe 61 is in a circular truncated cone shape with the diameter gradually increasing along the direction from the expanding pipe 61 to the connecting pipe 62, and the reducing pipe 63 is in a circular truncated cone shape with the diameter gradually decreasing along the direction from the connecting pipe 62 to the reducing pipe 63;

the blocking ball 64 is mounted in the connecting pipe 62 by an elastic member 65, and the blocking ball 64 is adapted to move in the connecting pipe 62 and to block the diameter-expanding pipe 61 when in contact with the inner wall surface of the diameter-expanding pipe 61 and to block the diameter-reducing pipe 63 when in contact with the inner wall surface of the diameter-reducing pipe 63.

The elastic member 65 is designed in advance for the pulling force of the blocking ball 64, and when the tissue fluid flowing speed in the suction tube 3 is within the safe speed range, the blocking ball 64 will not follow the tissue fluid to move to contact with the inner wall surface of the diameter return tube 63 and will not follow the tissue fluid to move to contact with the inner wall surface of the diameter expanding tube 61 under the pulling action of the elastic member 65.

When the suction speed in the suction pipe 3 is higher and exceeds the safe speed due to the fact that the negative pressure value in the test tube 1 is larger, the blocking ball 64 moves along with the tissue fluid flowing at a high speed and is in contact with the inner wall surface of the return pipe 63, at the moment, the blocking ball 64 blocks the return pipe 63, and pain of a patient caused by the fact that the suction speed of the suction pipe 3 is too high is prevented.

Preferably, in the initial state, that is, when the first valve 4 is not opened, the medium does not flow in the suction pipe 3, and the ball 64 is attached to the inner wall surface of the enlarged diameter pipe 61. When the first valve 4 is opened, the tissue fluid in the suction tube 3 flows toward the test tube 1 by the negative pressure in the test tube 1, and the blocking ball 64 is biased toward the test tube 1, so that the protection mechanism 6 is opened. When some special conditions occur, if the pressure value in the test tube 1 is increased, the air is easily discharged from the suction tube 3 to one side of the needle head 5, at the moment, the blocking ball 64 is always attached to the inner wall surface of the expanding tube 61 under the pushing of the gas flowing in the reverse direction, the protection mechanism 6 is in a closed state, the medium in the suction tube 3 is prevented from being guided, and the patient is prevented from being injured additionally.

Specifically, the elastic member 65 includes an elastic string, a tension spring, or an elastic sheet, and the elastic member 65 is made of a medical material.

Preferably, as shown in fig. 1, the suction device further comprises a negative pressure tube 7, one end of the negative pressure tube 7 passes through the sealing plug 2 and is located in the test tube 1, and the other end of the negative pressure tube 7 is connected with a pneumatic quick plug 71. When the suction volume is not enough and the negative pressure degree is not enough in the test tube 1, in time external negative pressure device reduces the pressure value in the test tube 1 to ensure the smooth operation of suction.

Preferably, the negative pressure tube 7 is provided with a second valve 72, and the second valve 72 is located outside the test tube 1. When the negative pressure device is not required to be connected or the vacuum pumping operation of the negative pressure device to the test tube 1 is completed, the negative pressure tube 7 is blocked by closing the second valve 72.

Preferably, the second valve 72 may be the same valve structure as the first valve 4.

Preferably, test tube 1 is equipped with anti-skidding portion outward, and anti-skidding portion includes in rubber sleeve, external screw thread portion and the dull polish line portion at least one. Wherein, the rubber sleeve refers to the rubber antiskid cover of ring cover on test tube 1 outer wall, repeatedly usable. Dull polish line portion, the antiskid cover that the outer wall face of ring cover has the dull polish line of putting on a contraceptive ring at test tube 1's outer wall is perhaps handled with test tube 1 outer wall through the dull polish, forms the dull polish line portion that has anti-skidding function. The external thread portion refers to and is similar to dull thread portion, and in the position department similar to dull thread portion, the external screw thread of turning out on the outer wall of test tube body 1 to increase the frictional force when medical personnel hold test tube 1.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A suction device is characterized by comprising a test tube, a sealing plug, a suction tube, a first valve and a needle head;

the sealing plug is used for sealing the pipe orifice of the test tube, and the interior of the test tube is in a negative pressure state;

one end of the suction tube is connected with the needle head, and the other end of the suction tube penetrates through the sealing plug and is positioned in the test tube;

first valve is established on the suction tube, first valve is located the test tube is outside.

2. The suction device as claimed in claim 1, wherein the first valve comprises a first valve body and a second valve body, the first valve body and the second valve body are rotatably connected through a rotating shaft, the first valve body is provided with a first nozzle and a first through hole which are communicated with each other, and the second valve body is provided with a second nozzle and a second through hole which are communicated with each other;

the first through hole and the second through hole are in a communicated or non-communicated state when the first valve body and the second valve body rotate to different angles relatively;

an annular sealing element is arranged between the first valve body and the second valve body, and the first through hole and the second through hole are both located in an annular ring of the annular sealing element.

3. The suction device as claimed in claim 2, wherein the first valve body is provided with a circular groove, the second valve body is cylindrical, the second valve body is partially or completely arranged in the circular groove and is rotatably connected with the second valve body through the rotating shaft, and the annular sealing member is arranged between the inner wall surface of the circular groove and the second valve body.

4. The suction device as claimed in claim 2 or 3, wherein the first through hole is plural, and plural first through holes are arranged at intervals in a circumferential direction of the rotary shaft;

and/or the second through holes are multiple and are arranged at intervals along the circumferential direction of the rotating shaft.

5. The pumping apparatus according to claim 2, wherein the first valve 4 further comprises a limiting member for limiting the relative rotation of the first valve body and the second valve body within a preset angular range.

6. The suction device according to claim 1, characterized in that a protection mechanism is connected in series with the suction pipe 3, and the protection mechanism comprises an expanding pipe, a connecting pipe and a diameter returning pipe which are connected in series in sequence, and further comprises a ball blocking and an elastic piece;

the diameter expanding pipe is in a circular table shape with the diameter gradually increasing along the direction from the diameter expanding pipe to the connecting pipe, and the diameter returning pipe is in a circular table shape with the diameter gradually decreasing along the direction from the connecting pipe to the diameter returning pipe;

the blocking ball is installed in the connecting pipe through the elastic piece, is suitable for moving in the connecting pipe, is suitable for blocking the expanding pipe when contacting with the inner wall surface of the expanding pipe, and is suitable for blocking the reducing pipe when contacting with the inner wall surface of the reducing pipe.

7. The suction device as claimed in claim 6, wherein the elastic member comprises an elastic string, a tension spring, or an elastic sheet.

8. The aspiration device of claim 1, further comprising a negative pressure tube, wherein one end of the negative pressure tube passes through the sealing plug and is positioned in the test tube, and the other end of the negative pressure tube is connected with a pneumatic quick plug.

9. The aspiration device of claim 8, wherein a second valve is disposed on the negative pressure tube, the second valve being located outside the test tube.

10. The aspiration device according to claim 1, wherein the test tube is externally provided with a non-slip portion.

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