1. The utility model provides a device that simulation aorta spouts blood which characterized in that: the method comprises the following steps:

a wearing member;

the base is arranged on the wearing piece, a mounting hole, a first inner cavity, a second inner cavity and a first air passage are arranged in the base, the first inner cavity is located between the mounting hole and the second inner cavity, and the mounting hole is communicated with the second inner cavity through the first air passage;

the opening of the inflation bottle is arranged in the mounting hole, and a first sealing film is sealed at the air port of the inflation bottle;

the blood storage mechanism stores artificial plasma and is communicated with the second inner cavity;

a trigger mechanism disposed within the base; and

and the manual switch is connected with the trigger mechanism and used for controlling the trigger mechanism to puncture the first sealing film so that the artificial plasma in the blood storage mechanism is sprayed out by the gas in the inflation bottle.

2. A device for simulating aortic blood ejection as claimed in claim 1, wherein: the trigger mechanism comprises a sliding block, a punching needle and a first elastic piece, the sliding block is in sealed sliding fit in the first inner cavity, the sliding block divides the first inner cavity into a first cavity and a second cavity, the first cavity is communicated with the manual switch, and the second cavity is communicated with the outside; a through hole is formed in the base, and the mounting hole is communicated with the first cavity through the through hole;

the punching needle is in sealed sliding fit in the through hole, one end of the punching needle extends into the first chamber and is connected to the sliding block, and the needle head of the punching needle extends into the mounting hole and is opposite to the first sealing film; the first elastic piece is arranged in the second cavity, and two ends of the first elastic piece are respectively the slide block and the inner cavity wall of the second cavity; the first cavity is filled with gas for enabling the sliding block to compress the first elastic piece, and the manual switch is used for releasing the gas in the first cavity.

3. A device for simulating aortic blood ejection as claimed in claim 2, wherein: the manual switch comprises a grab handle, a sliding column and a second elastic piece, the grab handle is provided with a sliding hole, the sliding hole is of a structure with one open end and one closed end, the grab handle is provided with a first air hole and a second air hole which are communicated with the sliding hole, the first air hole is communicated with the outside, and the second air hole is communicated with the first cavity;

the sliding column is in sealed sliding fit in the sliding hole, a second air passage is arranged in the sliding column, and a third air hole and a fourth air hole which are respectively communicated with the second air passage are arranged on the sliding column;

the second elastic piece is arranged between the bottom of the sliding column and the bottom of the sliding hole, and exerts elastic force on the sliding column so as to block the first air hole and the third air hole and the second air hole and the fourth air hole.

4. A device for simulating aortic blood ejection as claimed in claim 3, wherein: the cross sections of the sliding hole and the sliding column are rectangular, and the top of the grab handle is provided with a limiting frame for limiting the ejection of the sliding column;

the top of the sliding column is provided with a button, the hole bottom of the sliding hole is provided with a limiting column, and the limiting column is used for limiting the sliding column so that the first air hole is communicated with the third air hole and the second air hole is communicated with the fourth air hole in an aligning mode.

5. A device for simulating aortic blood ejection as claimed in claim 3, wherein: the blood storage mechanism comprises a blood storage tube body, a push plug and a liquid outlet conduit;

the blood storage tube body is arranged on the wearing piece, the push plug is in sliding fit with the inside of the blood storage tube body in a sealing mode, the push plug divides the blood storage tube body to form a first tube cavity and a second tube cavity, the first tube cavity is communicated with the second inner cavity, the second tube cavity is communicated with the liquid outlet guide tube, a nozzle is arranged at the port of the liquid outlet guide tube, and a second sealing film is sealed on the nozzle.

6. A device for simulating aortic blood ejection as claimed in claim 5, wherein: the base is provided with a fifth air hole, a sixth air hole and a seventh air hole, the fifth air hole is communicated with the first cavity and the second air hole respectively, the sixth air hole is communicated with the second inner cavity and the first tube cavity respectively, and the seventh air hole is communicated with the second cavity and the outside respectively.

7. A device for simulating aortic ejection as claimed in any one of claims 2 to 6, wherein: the inner wall of the mounting hole is provided with a limiting check ring, the diameter of the inner ring of the limiting check ring is larger than that of the punch needle, and the opening of the inflation bottle is in threaded fit in the mounting hole.

8. A device for simulating aortic ejection as claimed in any one of claims 2 to 6, wherein: the punching needle is provided with a limiting bulge, and the limiting bulge is positioned in the mounting hole.

9. A device for simulating aortic blood ejection as claimed in claim 6, wherein: the fifth air hole is communicated with the second air hole, and the sixth air hole is communicated with the first tube cavity through the air pipe.

10. A device for simulating aortic blood ejection as claimed in claim 3, wherein: the wearing piece adopts a waistband structure, and the grab handle is provided with an annular elastic band.

Background

The aorta is generally the aorta, pulmonary artery, innominate artery, common carotid artery, subclavian artery, common iliac artery, femoral artery, etc. The media layer of the artery wall is thickest and mainly comprises an elastic membrane (about 40-70 layers for adults) formed by a large number of elastic fibers, circular smooth muscle and the like. Therefore, the elasticity of the vessel wall is large, so it is also called elastic artery. It can buffer the strong pressure generated by the contraction of heart and promote the blood to continue flowing directionally by the elastic retraction when the heart is relaxed.

The aortic hemorrhage is a clinically common traumatic arterial hemorrhage disease, and in severe cases, the hemorrhage amount is too large, so that hemorrhagic shock is caused, and even the life is threatened. Therefore, there is a need for a teaching model that can simulate the blood ejection from the aorta, so as to facilitate the teaching and skill training.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a device for simulating aortic blood ejection, so as to improve the reality of a simulation scene and be recyclable.

In order to achieve the above object, the present invention provides a device for simulating aortic blood ejection, comprising a wearing piece; the base is arranged on the wearing piece, a mounting hole, a first inner cavity, a second inner cavity and a first air passage are arranged in the base, the first inner cavity is located between the mounting hole and the second inner cavity, and the mounting hole is communicated with the second inner cavity through the first air passage; the opening of the inflation bottle is arranged in the mounting hole, and a first sealing film is sealed at the air port of the inflation bottle; the blood storage mechanism stores artificial plasma and is communicated with the second inner cavity; a trigger mechanism disposed within the base; and the manual switch is connected with the trigger mechanism and used for controlling the trigger mechanism to puncture the first sealing film so that the artificial plasma in the blood storage mechanism is sprayed out by the gas in the inflation bottle.

Preferably, the trigger mechanism comprises a sliding block, a punch pin and a first elastic piece, the sliding block is in sealed sliding fit in the first inner cavity, the sliding block divides the first inner cavity into a first cavity and a second cavity, the first cavity is communicated with the manual switch, and the second cavity is communicated with the outside; a through hole is formed in the base, and the mounting hole is communicated with the first cavity through the through hole; the punching needle is in sealed sliding fit in the through hole, one end of the punching needle extends into the first chamber and is connected to the sliding block, and the needle head of the punching needle extends into the mounting hole and is opposite to the first sealing film; the first elastic piece is arranged in the second cavity, and two ends of the first elastic piece are respectively the slide block and the inner cavity wall of the second cavity; the first cavity is filled with gas for enabling the sliding block to compress the first elastic piece, and the manual switch is used for releasing the gas in the first cavity.

Preferably, the manual switch comprises a grab handle, a sliding column and a second elastic piece, the grab handle is provided with a sliding hole, the sliding hole is of a structure with one end open and the other end closed, the grab handle is provided with a first air hole and a second air hole communicated with the sliding hole, the first air hole is communicated with the outside, and the second air hole is communicated with the first cavity; the sliding column is in sealed sliding fit in the sliding hole, a second air passage is arranged in the sliding column, and a third air hole and a fourth air hole which are respectively communicated with the second air passage are arranged on the sliding column; the second elastic piece is arranged between the bottom of the sliding column and the bottom of the sliding hole, and exerts elastic force on the sliding column so as to block the first air hole and the third air hole and the second air hole and the fourth air hole.

Preferably, the cross sections of the sliding hole and the sliding column are rectangular, and the top of the grab handle is provided with a limiting frame for limiting the ejection of the sliding column; the top of the sliding column is provided with a button, the hole bottom of the sliding hole is provided with a limiting column, and the limiting column is used for limiting the sliding column so that the first air hole is communicated with the third air hole and the second air hole is communicated with the fourth air hole in an aligning mode.

Preferably, the blood storage mechanism comprises a blood storage tube body, a push plug and a liquid outlet conduit; the blood storage tube body is arranged on the wearing piece, the push plug is in sliding fit with the inside of the blood storage tube body in a sealing mode, the push plug divides the blood storage tube body to form a first tube cavity and a second tube cavity, the first tube cavity is communicated with the second inner cavity, the second tube cavity is communicated with the liquid outlet guide tube, a nozzle is arranged at the port of the liquid outlet guide tube, and a second sealing film is sealed on the nozzle.

Preferably, a fifth air hole, a sixth air hole and a seventh air hole are formed in the base, the fifth air hole is communicated with the first cavity and the second air hole respectively, the sixth air hole is communicated with the second inner cavity and the first tube cavity respectively, and the seventh air hole is communicated with the second cavity and the outside.

Preferably, the inner wall of the mounting hole is provided with a limiting check ring, the diameter of an inner ring of the limiting check ring is larger than that of the punch needle, and a bottle opening of the inflation bottle is in threaded fit in the mounting hole.

Preferably, the punching needle is provided with a limiting bulge, and the limiting bulge is positioned in the mounting hole.

Preferably, the fifth air hole is communicated with the second air hole, and the sixth air hole is communicated with the first tube cavity through an air pipe.

Preferably, the wearing piece adopts a waistband structure, and the grab handle is provided with an annular elastic band.

The invention has the beneficial effects that:

the invention discloses a device for simulating aortic blood spraying, wherein a demonstrator wears a wearing piece on the body, when the blood spraying scene of a wounded aorta such as femoral artery and brachial artery bleeding needs to be simulated, a manual switch is operated to control a trigger mechanism to puncture a first sealing film at an air port of an inflation bottle, gas in the inflation bottle rapidly enters a second inner cavity from a first air passage and sprays artificial plasma in a blood storage mechanism, so that the blood spraying scene of the aorta is really simulated.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural diagram of a device for simulating aortic blood ejection according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a base;

FIG. 3 is a schematic structural diagram of a manual switch;

FIG. 4 is a schematic view of the structure of the first chamber filled with gas;

FIG. 5 is a schematic structural view of the device for spraying blood;

fig. 6 is a schematic view of a structure for simulating blood ejection by operating a manual switch.

Reference numerals:

10-a wearing piece;

20-a base, 201-a mounting hole, 202-a first inner cavity, 2021-a first chamber, 2022-a second chamber, 203-a second inner cavity, 204-a first air channel, 205-a fifth air hole, 206-a sixth air hole, 207-a seventh air hole, and 208-a limiting retainer ring;

30-an inflation bottle, 301-a first sealing film;

40-blood storage mechanism, 401-blood storage body, 4011-first lumen, 4012-second lumen, 402-plug and 403-liquid outlet conduit;

50-a trigger mechanism, 501-a sliding block, 502-a punching needle, 503-a first elastic piece and 504-a limiting bulge;

60-manual switch, 601-grab handle, 6011-slide hole, 6012-first air hole, 6013-second air hole, 602-slide column, 6021-second air channel, 6022-third air hole, 6023-fourth air hole, 603-second elastic piece, 604-limit frame, 605-button and 606-limit column;

70-trachea.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one embodiment of the present invention, as shown in fig. 1-6, a device for simulating aortic ejection is provided, comprising a wearing member 10, a base 20, a gas-filled bottle 30, a blood storage mechanism 40, a trigger mechanism 50 and a manual switch 60.

Wherein, the base 20 is fixed on the wearing piece 10, and be provided with mounting hole 201, first inner chamber 202, second inner chamber 203 and first air flue 204 in the base 20, first inner chamber 202 is located between mounting hole 201 and the second inner chamber 203, and mounting hole 201 communicates through first air flue 204 with second inner chamber 203. The charging bottle 30 is filled with CO₂The mouth of the gas-filled bottle 30 is arranged in the mounting hole 201, and the first sealing film 301 is sealed at the gas port of the gas-filled bottle 30. The blood storage mechanism 40 stores artificial plasma therein, and the blood storage mechanism 40 communicates with the second lumen 203. The trigger mechanism 50 is disposed in the base 20, the manual switch 60 is connected to the trigger mechanism 50, and the manual switch 60 is used to control the trigger mechanism 50 to pierce the first sealing film 301, so as to make the CO in the air bottle 30₂The gas ejects the artificial plasma from the blood reservoir 40.

The device for simulating the blood spraying of the aorta of the embodiment is characterized in that a demonstrator wears a wearing piece 10 on the body, when the blood spraying scene of the aorta of a wounded patient such as femoral artery and brachial artery bleeding needs to be simulated, the manual switch 60 is operated, the manual switch 60 controls the trigger mechanism 50 to puncture the first sealing film 301 at the air port of the inflation bottle 30, the gas in the inflation bottle 30 rapidly enters the second inner cavity 203 from the first air passage 204, and the artificial plasma in the blood storage mechanism 40 is sprayed out, so that the blood spraying scene of the aorta is really simulated, and the device is small in structure, convenient to carry, recyclable, safe, reliable and low in cost.

Referring to fig. 2, in one embodiment, the trigger mechanism 50 includes a slider 501, a punch pin 502 and a first elastic element 503, the slider 501 is hermetically and slidably fitted in the first inner cavity 202, the slider 501 separates the first inner cavity 202 into a first chamber 2021 and a second chamber 2022, the first chamber 2021 is communicated with the manual switch 60, and the second chamber 2022 is communicated with the outside; a through hole is provided in the base 20, and the mounting hole 201 communicates with the first chamber 2021 through the through hole. The punching needle 502 is in sealed sliding fit in the through hole, one end of the punching needle 502 extends into the first chamber 2021 and is connected to the slider 501, and the needle head of the punching needle 502 extends into the mounting hole 201 and is opposite to the first sealing film 301; the first elastic piece 503 is installed in the second chamber 2022, and two ends of the first elastic piece 503 are respectively a slider 501 and an inner cavity wall of the second chamber 2022; the first chamber 2021 is filled with gas to make the slider 501 compress the first elastic member 503, and the manual switch 60 is used to release the gas in the first chamber 2021.

Referring to fig. 4, the arrows indicate the flow direction of the gas. Since the punch pin 502 is hermetically and slidably fitted in the through hole, the slider 501 is hermetically and slidably fitted in the first inner cavity 202, and the first chamber 2021 is only communicated with the manual switch 60, when gas (such as compressed air) is injected into the manual switch 60, the gas pushes the slider 501 to move towards the first elastic member 503 and compresses the first elastic member 503 after entering the first chamber 2021, and the slider 501 can exhaust the air in the second chamber 2022. Then, after the air bottle 30 is installed in the installation hole 201, the demonstrator releases the gas in the first chamber 2021 by operating the manual switch 60, and after the sliding block 501 loses the pushing force of the gas, the first elastic member 503 will quickly push the sliding block 501 to move towards the through hole, so that the impact needle 502 pierces the first sealing film 301 of the air bottle 30, and the CO filled in the air bottle 30₂The gas will rapidly flow towards the first air passage 204 and enter the second inner cavity 203, and the artificial plasma in the blood storage mechanism 40 is ejected, so that the blood ejection scene of the aorta of the wounded can be simulated really.

After the simulation is completed, the device can be reused by injecting artificial plasma into the blood storage mechanism 40 again, injecting compressed air into the manual switch 60 and replacing one air bottle 30 again, so that the device is recycled, safe, reliable and low in cost.

Referring to fig. 3, in an embodiment, the manual switch 60 includes a handle 601, a sliding column 602, and a second elastic member 603, where the handle 601 is provided with a sliding hole 6011, the sliding hole 6011 is in a structure with an open end and a closed end, the handle 601 is provided with a first air hole 6012 and a second air hole 6013 communicated with the sliding hole 6011, the first air hole 6012 is communicated with the outside, and the second air hole 6013 is communicated with the first chamber 2021; the sliding column 602 is in sealing sliding fit in the sliding hole 6011, a second air passage 6021 is arranged in the sliding column 602, and a third air hole 6022 and a fourth air hole 6023 which are respectively communicated with the second air passage 6021 are arranged on the sliding column 602; the second elastic member 603 is disposed between the bottom of the spool 602 and the bottom of the slide hole 6011, and the second elastic member 603 applies an elastic force to the spool 602 to block the first air hole 6012 from the third air hole 6022 and the second air hole 6013 from the fourth air hole 6023.

Specifically, when the spool 602 is not pressed, the second elastic member 603 pushes the spool 602 toward the opening of the spool 6011, at this time, the first air hole 6012 and the second air hole 6013 are sealed by the outer wall of the spool 602, the third air hole 6022 and the fourth air hole 6023 are sealed by the inner wall of the spool 6011, the first air hole 6012 is not communicated with the third air hole 6022, and the second air hole 6013 is not communicated with the fourth air hole 6023, so that the first chamber 2021 is not communicated with the outside, and the gas in the first chamber 2021 does not escape.

Referring to fig. 6, when the presenter presses the slide column 602, the slide column 602 moves towards the closed end of the slide hole 6011, and when the first air hole 6012 and the third air hole 6022 are aligned simultaneously, and the second air hole 6013 and the fourth air hole 6023 are aligned simultaneously, the first air hole 6012, the third air hole 6022, the second air passage 6021, the fourth air hole 6023, the second air hole 6013 and the first chamber 2021 are sequentially communicated, so that the gas in the first chamber 2021 enters the outside along the second air hole 6013, the fourth air hole 6023, the second air passage 6021, the third air hole 6022 and the first air hole 6012, and after the slide block 501 loses the pushing force of the gas in the first chamber 2021, the first elastic member 503 rapidly pushes the slide block 501 towards the through hole, so that the piercing needle 502 pierces the first sealing film 301 of the air bottle 30, and the CO in the air bottle 30₂The gas will rapidly flow towards the first air passage 204 and enter the second inner cavity 203, and the artificial plasma in the blood storage mechanism 40 is ejected, so that the blood ejection scene of the aorta of the wounded can be simulated really.

Before the device needs to be used repeatedly, the sliding column 602 needs to be pressed, so that the first air hole 6012 and the third air hole 6022, and the second air hole 6013 and the fourth air hole 6023 are aligned at the same time, then, by injecting compressed air into the first air hole 6012, the compressed air enters the first chamber 2021 through the first air hole 6012, the third air hole 6022, the second air passage 6021, the fourth air hole 6023 and the second air hole 6013 in sequence, so as to push the slider 501 against, and compress the second elastic member 603, so that the inflation bottle 30 can be installed in the installation hole 201, and the first sealing membrane 301 is prevented from being punctured by the impact needle 502 when the device is not used.

In one embodiment, the cross-sectional shapes of the slide hole 6011 and the slide column 602 are both rectangular, and the top of the handle 601 is provided with a limit frame 604 for limiting the pop-up of the slide column 602; the top of the sliding column 602 is provided with a button 605, the bottom of the sliding hole 6011 is provided with a limiting column 606, and the limiting column 606 is used for limiting the sliding column 602, so that the first air hole 6012 and the third air hole 6022, and the second air hole 6013 and the fourth air hole 6023 are aligned and communicated.

Because the cross-sectional shape of the spool 602 is rectangular, the spool 602 does not rotate relative to the handle 601 during pressing of the spool 602, which ensures that the first air hole 6012 and the third air hole 6022, and the second air hole 6013 and the fourth air hole 6023 are aligned after pressing of the spool 602. Since the second elastic member 603 pushes the sliding column 602 toward the opening of the sliding hole 6011, the limiting frame 604 is disposed at the top of the handle 601, so that the sliding column 602 is prevented from popping out of the sliding hole 6011 by the limiting frame 604. Due to the design of the limiting column 606, after the demonstrator presses the sliding column 602 to abut against the limiting column 606, the first air hole 6012 and the third air hole 6022, and the second air hole 6013 and the fourth air hole 6023 can be aligned and communicated quickly, so that the gas in the first chamber 2021 can be discharged quickly, and the first sealing film 301 of the air bottle 30 can be punctured by the puncture needle 502.

In one embodiment, the blood storage mechanism 40 comprises a blood storage tube body 401, a plunger 402 and a drain catheter 403; the blood storage body 401 is arranged on the wearing piece 10, the push plug 402 is in sealing sliding fit in the blood storage body 401, the push plug 402 separates the blood storage body 401 to form a first lumen 4011 and a second lumen 4012, the first lumen 4011 is communicated with the second inner cavity 203, the second lumen 4012 is communicated with the liquid outlet conduit 403, a nozzle is arranged at the port of the liquid outlet conduit 403, and a second sealing film is sealed in the nozzle.

When the presenter presses the sliding post 602, the air in the first chamber 2021 is exhausted to the outside, and the air inflation is punctured by the impact pin 502A first sealing film 301 of the bottle 30, CO filled in the gas-filled bottle 30₂The gas will rapidly flow towards the first air channel 204 and enter the second inner cavity 203 and the first lumen 4011 in sequence, and then push the plunger 402, so that the artificial plasma in the second lumen 4012 is ejected through the effluent conduit 403 and the nozzle, thereby truly simulating the blood ejection scene of the aorta of the wounded.

In one embodiment, the base 20 is provided with a fifth air hole 205, a sixth air hole 206 and a seventh air hole 207, the fifth air hole 205 is respectively communicated with the first chamber 2021 and the second air hole 6013, the sixth air hole 206 is respectively communicated with the second inner cavity 203 and the first tube cavity 4011, and the seventh air hole 207 is respectively communicated with the second chamber 2022 and the outside.

In one embodiment, the inner wall of the mounting hole 201 is provided with a limit stop ring 208, the diameter of the inner ring of the limit stop ring 208 is larger than that of the punch needle 502, and the mouth of the air inflation bottle 30 is in threaded fit in the mounting hole 201. The design of the limit retainer ring 208 can limit the installation position of the air bottle 30 in the installation hole 201, so as to avoid excessively screwing into the opening of the air bottle 30 to cause the punch pin 502 to puncture the first sealing film 301.

In one embodiment, the punch pin 502 is provided with a limiting protrusion 504, and the limiting protrusion 504 is located in the mounting hole 201. The structure design of the limiting protrusion 504 facilitates limiting the position of the plunger 502 and the slider 501 when the first chamber 2021 is filled with gas, so as to avoid the slider 501 from over-compressing the first elastic member 503. Furthermore, after the first sealing film 301 is pierced by the needle 502, CO released from the air port of the air bottle 30₂The gas pressure is high and may push the punch pin 502 to move toward the first chamber 2021, and the design of the limiting protrusion 504 ensures that the punch pin 502 does not completely exit the through hole, so as to prevent CO released from the gas-filled bottle 30₂Gas enters the first chamber 2021 through the through holes, thereby reducing the thrust effect on the plunger 402.

In one embodiment, the fifth gas hole 205 and the second gas hole 6013, and the sixth gas hole 206 and the first lumen 4011 are both in communication with the gas tube 70.

In one embodiment, the wearing member 10 is a waistband structure, the wearing member 10 can be conveniently worn between the waist of a demonstrator, the handle 601 is provided with an elastic band in a ring shape, and the elastic band is designed to conveniently fasten the manual switch 60 in the hand, so that the manual switch 60 is more hidden.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.