CN217245724U - Medical waste liquid collecting cylinder - Google Patents

Abstract

A medical waste liquid collecting barrel comprises a barrel body, a barrel cover, a flow stopping valve and a protecting barrel. The cylinder cover is covered on the cylinder opening of the cylinder body and defines a liquid storage cavity together with the cylinder body, and the cylinder cover is provided with a negative pressure suction opening; the flow stopping valve is arranged in the liquid storage cavity and comprises a retainer and a floating core, the retainer is fixed on the cylinder cover, and the floating core can be floatingly retained in the retainer. The top end of the protective cylinder is connected with the cylinder cover and defines a closed floating core cavity together with the cylinder cover, and the retainer extends into the floating core cavity. The protection cylinder comprises an outer cylinder, an inner cylinder and an interlayer positioned between the outer cylinder and the inner cylinder, and the top of the interlayer is provided with a liquid inlet for communicating the interlayer to the liquid storage cavity; the bottom wall of the inner cylinder is provided with a liquid inlet hole for communicating the floating core cavity to the interlayer; the floating core floats when receiving the buoyancy from the liquid in the floating core cavity so as to close the negative pressure suction port. The utility model discloses can avoid falling down because of the medical waste liquid collecting cylinder is unexpected, and the negative pressure suction mouth is blockked up by the accident and leads to the problem that the negative pressure suction mouth of medical waste liquid collecting cylinder is closed in advance.

Description

Medical waste liquid collecting cylinder

Technical Field

The utility model relates to a medical waste liquid collecting device.

Background

In the operation process of needing to remove blood, sputum, human tissues or body fluid of a patient in an operating room, an emergency room and the like, a negative pressure suction system is needed to absorb and store the medical waste fluid, so that the phenomenon of secondary pollution in a hospital is avoided. The medical waste liquid collecting cylinder is one of the main components of the negative pressure suction system and is used for storing absorbed waste liquid. The cylinder cover of the medical waste liquid collecting cylinder connected with the negative pressure source is generally provided with a check valve which is used for preventing the waste liquid from being sucked into the negative pressure source due to overhigh liquid level in the medical waste liquid collecting cylinder to cause the damage of the negative pressure source.

A patent application entitled "medical waste liquid collecting cylinder" and having a patent application number of 201910483605.3, filed by the applicant of the present application on 6/4/2019 to the patent office, discloses a structure of a check valve, which includes a retainer and a floating core. The top of the retainer is fixed on the inner wall of the cylinder cover around the negative pressure suction port, the floating core can be retained in the retainer in a floating way, and the floating core can float upwards when receiving the buoyancy of liquid in the inner cavity of the cylinder body so as to close the negative pressure suction port. The check valve with the structure has the following defects: when the medical waste liquid collecting cylinder falls down accidentally due to collision and the like, the floating core floats at a speed slower than the liquid impacts the negative pressure suction port, so that part of waste liquid enters a negative pressure source slowly due to the closing of the floating core and pollutes a negative pressure system of a hospital; in addition, in the case where the negative pressure suction port is accidentally clogged and the clogging condition subsequently disappears, the floating core floats to close the negative pressure suction port, which may cause the medical waste liquid negative pressure suction system to stop working when the medical waste liquid collecting cylinder is not filled with the waste liquid, resulting in waste of medical resources.

Disclosure of Invention

The utility model aims to solve the technical problem that a medical waste liquid collecting barrel is provided, it can reduce because of the unexpected risk that falls and lead to the waste liquid in the medical waste liquid collecting barrel to get into the negative pressure suction mouth and the negative pressure suction mouth is blockked up and the jam situation disappears afterwards and leads to the risk that the negative pressure suction mouth was closed in advance because of the medical waste liquid collecting barrel accident.

The embodiment of the utility model provides a medical waste liquid collecting cylinder, which comprises a cylinder body, a cylinder cover and a flow stopping valve; the cylinder cover is covered on the opening of the cylinder body and defines a liquid storage cavity together with the cylinder body, and the cylinder cover is provided with a negative pressure suction opening; the flow stopping valve is arranged in the liquid storage cavity and comprises a retainer and a floating core, the retainer is fixed on the cylinder cover, and the floating core can be floatingly retained in the retainer; the flow stopping valve also comprises a protective cylinder, the top end of the protective cylinder is connected with the cylinder cover and defines a closed floating core cavity together with the cylinder cover, and the retainer extends into the floating core cavity; the protection barrel comprises an outer barrel, an inner barrel and an interlayer positioned between the outer barrel and the inner barrel, the outer barrel is provided with a first annular side wall and a first bottom wall connected with the bottom end of the first annular side wall, and the inner barrel is provided with a second annular side wall and a second bottom wall connected with the bottom end of the second annular side wall; the top of the interlayer is provided with a liquid inlet used for communicating the interlayer to the liquid storage cavity; the second bottom wall of the inner cylinder is provided with a liquid inlet hole for communicating the floating core cavity to the interlayer; the floating core floats upwards when receiving the buoyancy of the liquid in the floating core cavity so as to close the negative pressure suction port.

The utility model discloses at least, have following advantage:

1. when the medical waste liquid collecting barrel normally works, when the liquid level of the waste liquid collected in the liquid storage cavity rises to a preset liquid level, the waste liquid can enter the interlayer through the liquid inlet of the interlayer and enter the floating core cavity through the liquid inlet hole of the inner barrel, and the floating core of the flow stopping valve provided by the embodiment of the utility model can float upwards under the buoyancy of the liquid in the floating core cavity, so that the negative pressure suction port is closed, and the phenomenon that the waste liquid is sucked into a negative pressure source to pollute the negative pressure source due to overhigh liquid level in the barrel is avoided; when the medical waste liquid collecting cylinder is accidentally fallen down, the waste liquid needs to sequentially enter the liquid inlet of the interlayer from the liquid storage cavity of the waste liquid collecting cylinder and then enter the floating core cavity from the interlayer through the liquid inlet hole in the bottom surface of the inner cylinder, so that the flowing path of the liquid is greatly prolonged, the time required for the waste liquid to enter the floating core cavity from the liquid storage cavity is longer than the closing time of the floating core, the situation that the medical waste liquid enters the negative pressure suction port to pollute the negative pressure source of a hospital due to the accidental falling of the medical waste liquid collecting cylinder is avoided, and the cleanness of the hospital environment is ensured;

2. the setting is in the utility model discloses feed liquor hole on the second diapire of flow stopping valve inner tube not only plays the effect of feed liquor, has still played the effect of admitting air, has realized floating the gaseous intercommunication between core chamber and the stock solution chamber to the gas pressure difference of core top and below has been reduced to float. When the medical waste liquid collecting cylinder is not filled with waste liquid, if the negative pressure suction port above the floating core is accidentally blocked and the blocking condition disappears afterwards, the floating core cannot float upwards too high to close the negative pressure suction port in advance due to the fact that the air pressure difference between the upper part and the lower part of the floating core is not too large, and normal work of the medical waste liquid negative pressure suction system is guaranteed.

Drawings

Fig. 1 shows a schematic front view of a medical waste liquid collecting tube according to an embodiment of the present invention.

Fig. 2 shows an exploded view of a medical waste fluid collecting cartridge according to an embodiment of the present invention.

Fig. 3 shows a schematic partial explosion of a protective cartridge of a medical waste fluid collecting cartridge according to an embodiment of the present invention.

Fig. 4 shows a schematic cross-sectional view of a medical waste collection canister according to an embodiment of the present invention, wherein the floating core of the flow stop valve is in an initial position.

Fig. 5 shows a schematic cross-sectional view of a medical waste collection canister according to an embodiment of the invention, wherein the floating core of the flow stop valve is in a closed position.

Fig. 6 is a schematic perspective view of the outer barrel and the inner barrel according to an embodiment of the present invention, in which the first bottom wall of the outer barrel is removed.

Fig. 7 shows a schematic bottom view of the outer and inner barrels according to an embodiment of the present invention, with the first bottom wall of the outer barrel removed.

Fig. 8 shows a schematic cross-sectional view C-C of fig. 7.

Fig. 9 and 10 respectively show a schematic perspective view of the first bottom wall from different angles according to an embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Please refer to fig. 1 to 10. According to the utility model discloses a medical waste liquid collecting cylinder of embodiment, including barrel 1, cover 2 and only flow valve 3.

The cover 2 covers the opening of the cylinder 1 and defines a liquid storage chamber 10 together with the cylinder 1. In this embodiment, the barrel 1 is a plastic bottle, and the cap 2 is snap-connected to the top end of the barrel 1. The top of the cylinder cover 2 is provided with a plurality of convex pipes 21, one of the convex pipes 21 connected with a negative pressure source is communicated with a negative pressure suction port 20 arranged on the cylinder cover 2, and the negative pressure suction port 20 is communicated with the liquid storage cavity 10. In other embodiments, the cylinder 1 is a soft bag, and the cylinder cover 1 is hermetically connected to the mouth of the soft bag by a sealing method, including but not limited to a heat sealing method. When the cylinder body 1 is a soft bag, the cylinder body needs to be placed in a plastic bottle for use.

The check valve 3 is disposed in the reservoir chamber 10. The flow stop valve 3 includes a cage 31, a floating core 32, and a protective cylinder 33. The top of the retainer 31 is fixed to the inner wall of the cover around the negative pressure suction port 20, and the floating core 32 is floatably retained in the retainer 31.

In the present embodiment, the holder 31 has a hollow structure penetrating in the axial direction of the holder, and the side wall 311 of the holder 31 is provided with a plurality of holding grooves 313 extending in the axial direction and penetrating the holder side wall 311. The floating core 32 is inserted into the holder 31 from the lower end of the holder 31, and a plurality of protrusions 323 corresponding to the plurality of holding grooves 313 are provided on the side surface of the floating core 32, and the plurality of protrusions 323 extend into the plurality of holding grooves 313 without falling down. Alternatively, the number of the holding grooves 313 is 3, and the number of the protrusions 323 is 3. Each of the protrusions 323 is supported at the bottom of the corresponding holding groove 313 to prevent the floating core 32 from falling.

In this embodiment, the holder 31 further comprises an upper wall 312, the upper wall 312 is provided with a central through hole 3120, the central through hole 3120 is located right below the negative pressure suction port 20, the periphery of the upper wall 312 is connected with the side wall 311 of the holder, and the upper wall 312 and the side wall 311 of the holder 31 jointly define a cavity 314 with a downward opening, and the floating core 32 is inserted into the cavity 314. The top end of the side wall 311 of the holder 31 is sealingly connected to the inner wall of the cover around the negative pressure suction port 20, and the float core 32 floats up when receiving buoyancy from liquid in a float core chamber described below to shield the central through hole 3120 of the upper wall 312, thereby closing the negative pressure suction port 20.

Alternatively, the inner wall of the cover around the negative pressure suction port 20 has a first annular protrusion 23 extending downward, the top end of the upper wall 312 of the holder 31 has a second annular protrusion 315 extending upward, and the outer peripheral surface of the second annular protrusion 315 is in sealing fit with the inner peripheral surface of the first annular protrusion 23, wherein the sealing fit may be interference fit, heat seal connection, or the like.

Further, the inner wall of the cylinder cover around the negative pressure suction port 20 has a second annular projection 24 extending downward, and the second annular projection 24 is located inside the first annular projection 23. The medical waste liquid collecting barrel comprises an antibacterial breathable film 4, the shape of the antibacterial breathable film 4 can be a film shape or a sheet shape, the antibacterial breathable film 4 is supported on the upper wall 312 of the holder, the periphery of the antibacterial breathable film 4 is in sealing fit with the inner peripheral surface of the second annular bulge 24, and the sealing fit mode can be an interference fit mode and the like.

The floating core 32 comprises a floating core body 321 and a rubber plug 322, the rubber plug 322 is fixed on the top of the floating core body 321, and the plurality of protrusions 323 are arranged on the side surface of the floating core body 321. The top end of the rubber plug 322 has a closing portion 3221 with a rounded truncated cone shape, and the center of the top surface of the closing portion 3221 is recessed inward, which is favorable for forming a good sealing fit with the inner wall of the upper wall around the central through hole 3120, thereby reliably closing the central through hole 3120. Optionally, the floating core body 321 is made of plastic, and the rubber plug 322 is made of rubber, but not limited thereto.

In this embodiment, the floating core body 321 includes a third bottom wall 3211 and a third annular side wall 3212 extending upward from the periphery of the third bottom wall 3211, the third bottom wall 3211 and the third annular side wall jointly define an upward-opening floating core body cavity 3213, and the rubber plug 322 is embedded in the mouth of the floating core body cavity 3213.

The top end of the protective cylinder 33 is connected with the cylinder cover 2 and defines a closed floating core cavity 30 together with the cylinder cover 2, and the retainer 31 extends into the floating core cavity 30. The protective tube 33 includes an outer tube 33a, an inner tube 33b, and an interlayer 33c between the outer tube 33a and the inner tube 33 b.

The outer cylinder 33a has a first annular side wall 331 and a first bottom wall 333 connected to a bottom end of the first annular side wall 331, and the inner cylinder has a second annular side wall 332 and a second bottom wall 334 connected to a bottom end of the second annular side wall 332. The meaning of "annular" here is not limited to circular rings, but may also be rings of other shapes, for example polygonal rings.

The top of the interlayer 33c has a liquid inlet 34d for communicating the interlayer 33c to the liquid storage chamber 10. The second bottom wall 334 of the inner cylinder 33b is provided with a liquid inlet hole 335 for communicating the floating core chamber 30 to the sandwiched layer 33 c.

In this embodiment, the top end of the second annular sidewall 332 is connected with the inner wall of the cylinder cover around the negative pressure suction port 20 in a sealing manner, and the second annular sidewall 332 and the cylinder cover 2 together define the float core chamber 30. Wherein, the inner wall of cover 2 is equipped with annular groove 25, and annular groove 25 is located the outside of first annular arch 23, and the top of second annular lateral wall 332 is embedded into annular groove 25, reaches the effect with cover inner wall sealing connection through modes such as interference fit, bonding. The second annular sidewall 332 is connected to the first annular sidewall 331 via a plurality of connecting ribs 338, the top end of the second annular sidewall 332 is higher than the top end of the first annular sidewall 331, and a part of the gap between the top end of the second annular sidewall 332 and the first annular sidewall 331 is closed by the rib 336 connected between the first annular sidewall 331 and the second annular sidewall 332, while the remaining part is left open, and the open part constitutes the liquid inlet 34 d.

In another embodiment, the top ends of the first annular sidewall 331 and the second annular sidewall 332 are connected with the inner wall of the cover around the negative pressure suction port 20 in a sealing manner, and the liquid inlet 34d is disposed at the side of the first annular sidewall 331. In another embodiment, the top end of the first annular sidewall 331 is connected to the inner wall of the cover around the negative pressure suction port 20 in a sealing manner, the top end of the first annular sidewall 331 is higher than the top end of the second annular sidewall 332, the top end of the second annular sidewall 332 is connected to the inner wall of the first annular sidewall 331, and the liquid inlet 34d is disposed at the side of the first annular sidewall 331.

Optionally, the liquid inlet 34d is disposed on a side of the interlayer 33c away from the inner wall of the cylinder, so that the probability that the liquid splashed onto the inner wall of the liquid storage cavity 10 enters the interlayer 33c through the liquid inlet 34d can be greatly reduced.

In this embodiment, the first bottom wall 333 is provided with a first drain hole 3331. The protective cylinder 33 includes a first valve sheet 351, and the first valve sheet 351 is disposed in the fluid storage chamber 10 to open and close the first fluid discharge hole 3331. Be equipped with one or more first projection 3332 on the bottom surface of first diapire 333, first valve block 351 is equipped with the first mounting hole 3512 with one or more first projection 3332 one-to-one, and a plurality of first projection 3332 inserts respectively in a plurality of first mounting hole 3512 to link together first valve block 351 and first diapire 333. The first valve sheet 351 always has a tendency to abut against the bottom surface of the first bottom wall 333. When the first valve plate 351 abuts against the bottom surface of the first bottom wall 333, the first drainage hole 3331 is closed by the first valve plate 351 and is in a closed state, and when the first valve plate 351 is pushed open by the pressure of the liquid in the interlayer 33c, the first drainage hole 3331 is in an open state. When the medical waste liquid collecting cylinder is vibrated and splashed liquid enters the interlayer 33c through the liquid inlet 34d, if the liquid level in the liquid storage cavity 10 is not in contact with the first valve plate 351, the first valve plate 351 can be pushed open when the liquid in the interlayer 33c is enough, so that the liquid is automatically emptied. After the liquid is discharged, the first valve plate 351 automatically adheres to the bottom surface of the first bottom wall 333 by its own elastic force, and closes the first liquid discharge hole 3331 again. If the liquid surface in the reservoir chamber 10 has contacted the first valve sheet 351, the first valve sheet 351 cannot be pushed open even if the liquid in the sandwiched layer 33c is sufficiently large.

The first valve sheet 351 functions as a first check valve provided in the first drain hole 3331, and allows only the liquid in the interlayer 33c to flow into the reservoir chamber 10 without flowing backward.

In this embodiment, the second bottom wall 334 is provided with a second drain hole 3342. The protective casing 33 includes a second valve plate 362, and the second valve plate 362 is provided in the interlayer 33c to open and close the second drain hole 3342. One or more second protruding columns 3344 are disposed on the bottom surface of the second bottom wall 334, the second valve plate 362 is provided with second mounting holes 3624 corresponding to the one or more second protruding columns 3344, and the plurality of second protruding columns 3344 are respectively inserted into the plurality of second mounting holes 3624, so that the second valve plate 362 and the second bottom wall 334 are connected together. The second valve flap 362 always has a tendency to cling to the bottom surface of the second bottom wall 334. When the second valve plate 362 abuts against the bottom surface of the second bottom wall 334, the second drain hole 3342 is closed by the second valve plate 362 and is in a closed state, and when the second valve plate 362 is pushed open by the pressure of the liquid in the float chamber 30, the second drain hole 3342 is in an open state. When the medical waste liquid collecting cylinder is subjected to vibration and the like, some splashed liquid enters the floating core cavity 30 through the liquid inlet 34d and the liquid inlet hole 335, if the liquid level in the interlayer 33c does not contact the second valve sheet 362, the second valve sheet 362 is pushed open when the liquid in the floating core cavity 30 is sufficient, and therefore automatic emptying of the liquid is achieved. After the liquid is discharged, the second valve plate 362 will automatically stick to the bottom surface of the second bottom wall 334 by its own elastic force, and close the second liquid discharge hole 3342 again. If the liquid level in the interlayer 33c contacts the second valve piece 362, the second valve piece 362 cannot be pushed open even if the liquid in the float core chamber 30 is enough.

The second valve sheet 362 functions as a second check valve provided in the second drain hole 3342, and the second check valve allows only the liquid in the float core chamber 30 to flow into the interlayer 33c without flowing backward.

The first valve plate 351 and the second valve plate 362 are made of plastic or rubber. Each of the first valve sheet 351 and the second valve sheet 362 has a structure that is wide at both ends and narrow in the middle to reliably close the corresponding drain hole. In other embodiments, the first panel 351 is connected to the first bottom wall 333 by bonding or heat sealing, and the second panel 362 is connected to the second bottom wall 334 by bonding or heat sealing.

The floating core 32 of the check valve is in the initial position when the liquid level in the floating core chamber does not reach the closing liquid level, as shown in fig. 4, and at this time, the plurality of convex portions 323 of the floating core 32 are supported by the respective groove bottoms of the corresponding holding grooves 313 under the self-weight of the floating core 32. When the liquid level of the waste liquid collected in the liquid storage cavity 10 rises to a preset liquid level, the waste liquid can enter the interlayer 33c through the liquid inlet 34d of the interlayer 33c and enter the floating core cavity 30 through the liquid inlet hole 335 of the inner cylinder, the floating core 32 of the check valve can float by the buoyancy of the liquid in the floating core cavity 30, so that the central through hole 3120 of the upper wall 312 is closed, the negative pressure suction port 20 is also closed, the waste liquid in the cylinder can not be sucked by the negative pressure source communicated with the negative pressure suction port 20, and the damage of the negative pressure source caused by the fact that the waste liquid is sucked into the negative pressure source due to the fact that the liquid level in the medical waste liquid collection cylinder is too high is avoided.

When the medical waste liquid collecting tube falls down accidentally, a centrifugal force is generated on the floating core 32 to enable the floating core 32 to move towards the negative pressure suction port 20 along the retainer 31, and the negative pressure suction port is sucked by negative pressure, so that the floating core 32 can be closed quickly. The waste liquid needs to enter the liquid inlet 34d of the interlayer 33c from the liquid storage cavity 10 in sequence, and then enters the floating core cavity 30 from the interlayer 33c through the liquid inlet hole 335 on the bottom surface of the inner cylinder, which is a long distance, so the required time for the waste liquid to enter the floating core cavity 30 from the liquid storage cavity 10 is longer than the closing time of the floating core, thereby avoiding the situation that the medical waste liquid enters the negative pressure suction port and further pollutes the negative pressure source of the hospital due to the accidental falling of the medical waste liquid collecting cylinder, and ensuring the normal work of the medical waste liquid negative pressure suction system and the environment of the hospital not to be polluted. When medical waste liquid collecting cylinder has not filled with the waste liquid yet, if the negative pressure suction mouth 20 that is located floating core top is stopped up and the jam situation disappears afterwards by accident, because the utility model discloses be equipped with feed liquor hole 335 on the bottom surface of inner tube for it is not too big to float core 32 top and the gas pressure difference of below, floats core 32 and can not come up too high and close negative pressure suction mouth 20 in advance.

The present embodiments have been described in conjunction with specific examples, but it will be understood by those of ordinary skill in the art that the present invention is not limited to the examples described herein, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.

Claims (11)

1. A medical waste liquid collecting cylinder comprises a cylinder body, a cylinder cover and a flow stopping valve; the cylinder cover is covered on the opening part of the cylinder body, and defines a liquid storage cavity together with the cylinder body, and the cylinder cover is provided with a negative pressure suction opening; the flow stopping valve is arranged in the liquid storage cavity and comprises a retainer and a floating core, the retainer is fixed on the barrel cover, and the floating core can be floatingly held on the retainer; the flow stopping valve is characterized by further comprising a protective cylinder, the top end of the protective cylinder is connected with the cylinder cover and defines a closed floating core cavity together with the cylinder cover, and the retainer extends into the floating core cavity;

the protection barrel comprises an outer barrel, an inner barrel and an interlayer positioned between the outer barrel and the inner barrel, the outer barrel is provided with a first annular side wall and a first bottom wall connected with the bottom end of the first annular side wall, and the inner barrel is provided with a second annular side wall and a second bottom wall connected with the bottom end of the second annular side wall; the top of the interlayer is provided with a liquid inlet for communicating the interlayer to the liquid storage cavity; a liquid inlet hole is formed in the second bottom wall of the inner cylinder and used for communicating the floating core cavity to the interlayer;

the floating core floats when receiving the buoyancy from the liquid in the floating core cavity, so that the negative pressure suction port is closed.

2. The medical waste collection cartridge of claim 1, wherein said first bottom wall is provided with a first drainage aperture;

the protection cylinder comprises a first one-way valve, the first one-way valve is arranged in the first liquid discharge hole, and the first one-way valve only allows liquid in the interlayer to flow into the liquid storage cavity and cannot flow back.

3. The medical waste liquid collecting barrel as claimed in claim 2, wherein the protective barrel comprises a first valve plate disposed in the liquid storage cavity for opening and closing the first liquid discharge hole; the first valve plate is connected with the first bottom wall and always tends to be attached to the bottom surface of the first bottom wall;

when the first valve plate clings to the bottom surface of the first bottom wall, the first liquid discharging hole is blocked by the first valve plate and is in a closed state, and when the first valve plate is jacked open by the pressure of liquid in the interlayer, the first liquid discharging hole is in an open state.

4. The medical waste liquid collecting cartridge as claimed in claim 1 or 2, wherein said second bottom wall is provided with a second liquid discharge hole;

the protective cylinder comprises a second one-way valve, the second one-way valve is arranged in the second liquid discharge hole, and the second one-way valve only allows liquid in the floating core cavity to flow into the interlayer and cannot flow back.

5. The medical waste liquid collecting cartridge as claimed in claim 4, wherein the protective cartridge includes a second valve plate provided in the intermediate layer for opening and closing the second drain hole; the second valve plate is connected with the second bottom wall and always tends to be attached to the bottom surface of the second bottom wall;

when the second valve plate is attached to the bottom surface of the second bottom wall, the second liquid discharge hole is closed by the second valve plate and is in a closed state, and when the second valve plate is pushed open by pressure of liquid in the floating core cavity, the second liquid discharge hole is in an open state.

6. The medical waste liquid collecting cartridge as claimed in claim 1, wherein the top end of said second annular side wall is sealingly connected to the inner wall of said cap around said negative pressure suction port, said second annular side wall and said cap together defining said float chamber.

7. The medical waste liquid collecting cartridge as claimed in claim 1, wherein the liquid inlet is disposed on a side of the interlayer away from the inner wall of the cartridge body.

8. The medical waste collection cartridge of claim 1 or 7, wherein said second annular sidewall is continuous with said first annular sidewall, said second annular sidewall having a top end that is higher than a top end of said first annular sidewall; one part of the gap between the top end of the second annular side wall and the first annular side wall is closed, the other part of the gap is kept open, and the open part forms the liquid inlet.

9. The medical waste liquid collecting cartridge as claimed in claim 1, wherein the holder has a hollow structure penetrating in an axial direction of the holder, and a side wall of the holder is provided with a plurality of holding grooves extending in the axial direction and penetrating the side wall of the holder;

the floating core is inserted into the retainer from the lower end of the retainer, a plurality of protruding parts corresponding to the plurality of retaining grooves are arranged on the side surface of the floating core, and the protruding parts respectively extend into the plurality of retaining grooves without falling to the ground.

10. The medical waste liquid collecting cartridge as claimed in claim 9, wherein the holder includes an upper wall provided with a central through hole located directly below the negative pressure suction port, the peripheral edge of the upper wall being connected to the side wall of the holder, the upper wall and the side wall of the holder together defining a downwardly opening cavity, the floating core being inserted into the cavity;

the side wall of the retainer is hermetically connected with the inner wall of the cylinder cover around the negative pressure suction port, and the floating core floats upwards when receiving buoyancy from liquid in the floating core cavity to shield the central through hole of the upper wall, so that the negative pressure suction port is closed.

11. The medical waste fluid collection cartridge of claim 1, wherein the floating core comprises a floating core body and a rubber plug;

the floating core body comprises a third bottom wall and a third annular side wall extending upwards from the periphery of the third bottom wall, the third bottom wall and the third annular side wall jointly define an upwards-opened floating core body inner cavity, and the rubber plug is embedded in an opening of the floating core body inner cavity.

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