Drainage apparatus capable of adjusting negative pressure source and stabilizing pressure

Abstract

The invention discloses a drainage device capable of adjusting a negative pressure source and stabilizing pressure. A liquid pouring opening is formed in the rear side face of the hard shell, the front side face of the liquid storage soft bag is in sealed butt joint with the liquid pouring opening, the top cover is in sealed connection with the hard shell, the change-over valve is arranged in the middle of the top cover, and the negative pressure connector is arranged on the top cover and communicated with negative pressure source equipment through a negative pressure pipe. The pressure regulating valve is arranged on the top cover and can be used for regulating the pressure difference between the inner cavity of the hard shell and the outside; an upper end outlet of the change-over valve can be connected with a drainage tube; the liquid storage soft bag comprises a front bag film and a rear bag film, a non-return film piece capable of correspondingly covering the liquid pouring opening is arranged between the front bag film and the rear bag film, and the upper edge of the non-return film piece is tightly attached to and fixedly connected with the front bag film. The front bag film, the non-return film and the rear bag film are flatly laid and welded, the short non-return film is pushed backwards when liquid is poured, and the liquid is injected into the liquid storage soft bag. And during negative pressure drainage, the non-return diaphragm is forwards clung to cover the liquid pouring opening under the action of negative pressure, so that the accumulated liquid in the liquid storage soft bag cannot flow back.

Description

Technical Field

[0001] The present invention relates to medical drainage care technology, and particularly to a drainage device capable of adjusting a negative pressure source and stabilizing pressure. Background Art

[0002] In the field of medical drainage, atmospheric drainage or negative pressure drainage can be used. During the negative pressure drainage process, a clinical negative pressure source of 15 KPA provided by a central negative pressure device in a medical facility is usually adopted. During use, due to differences in the number and distance of the usage ends carried, the absolute value of the negative pressure source pressure at certain points may exceed 15 KPA. Generally, only about 1 KPA of the absolute value of the negative pressure required for the drainage process is needed, which is much smaller than the pressure value of the negative pressure source.

[0003] The controllable water-sealed negative pressure drainage device disclosed in Chinese Utility Model Patent CN94213562.8 includes a liquid collection bottle, a water-sealed bottle, a pressure-regulating bottle, and a negative pressure chamber. The three-chamber drainage bottle disclosed in Chinese Invention Patent CN103285434 includes a liquid accumulation bottle, a water-sealed bottle, and a pressure-regulating bottle. Both of the two disclosed patent documents form a negative pressure drainage device by connecting and combining each bottle body through pipelines. The volume of the liquid accumulation bottle has certain specification requirements to accommodate a certain amount of drained liquid, so that the volume of the entire device is relatively large to meet the drainage requirements. Moreover, this seat-type drainage device is prone to tipping over during use. Once it tips over, the sealing effect of the water-sealed bottle will be lost.

[0004] The precision drainage bag for preventing liquid backflow disclosed in Chinese Utility Model Patent CN204033868U includes a bag body and a bottle body. The bag body is heat-sealed with a diversion plate and an interface and then connected to the bottle body to form an integrated drainage device. Although the capacity is expanded, negative pressure drainage cannot be carried out. Because under the condition of bearing negative pressure, the liquid accumulated in the bag body will flow back into the bottle body.

[0005] The precision urine bag disclosed in Chinese Utility Model Patent CN211325200U includes a soft urine bag and a hard urine box, and a second communication hole is provided to connect the inner spaces of the two, increasing the capacity for accumulated drainage, but negative pressure drainage cannot be implemented, and the negative pressure value of the drainage cannot be adjusted / limited.

[0006] The existing large-capacity negative pressure drainage devices have relatively large specifications, while the split-type drainage devices with a relatively small hard shell and a liquid accumulation bag cannot perform negative pressure drainage because the liquid accumulation bag cannot withstand negative pressure and can only perform natural drainage. When the liquid in the liquid accumulation bag is under the action of negative pressure, it is easy to flow back into the hard shell, resulting in the risk of flowing back into the drainage tube, and at least causing the hard shell to be full and the drainage to pause.

[0007] In the existing drainage device with a combination of a soft bag and a hard box, when negative pressure is pumped, the soft bag will deform and sink, and the liquid in the soft bag will be pushed back and flow back into the hard box in a reverse flow. The existing drainage device is provided with an exhaust hole and can perform stepwise pressure regulation / step-down with a fixed amplitude in one gear, and pressure setting cannot be performed. It is necessary to use a pressure gauge for pressure setting, and it is impossible to conveniently perform pressure setting and overpressure limit / overlimit pressure relief. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a drainage device with a small size, large capacity, adjustable pressure value that can be connected to a negative pressure source, anti-backflow safety type, adjustable negative pressure source and voltage stabilization.

[0009] To solve the above technical problems, the technical solution adopted by the present invention is: a drainage device with an adjustable negative pressure source and voltage stabilization, which includes a rigid housing with a liquid pouring port on the rear side, a liquid storage soft bag with a front side hermetically docked with the liquid pouring port, a top cover hermetically connected to the rigid housing, a conversion valve provided in the middle of the top cover, a negative pressure interface provided on the top cover and connected to a negative pressure source device through a negative pressure pipe, and a pressure regulating valve provided on the top cover and capable of adjusting the pressure difference between the inner cavity of the rigid housing and the outside. The upper end outlet of the conversion valve can be connected to a drainage tube; the liquid storage soft bag includes a front bag film and a rear bag film, and a check valve film capable of correspondingly covering the liquid pouring port is provided between the front bag film and the rear bag film. The upper edge of the check valve film is tightly and fixedly connected to the front bag film, and the lower edge of the check valve film is separable from the front bag film.

[0010] As an improvement to the technical solution of the drainage device with an adjustable negative pressure source and voltage stabilization of the present invention, both sides of the check valve film are also tightly and fixedly connected to the front bag film to form vertically extending connecting edges.

[0011] As an improvement to the technical solution of the drainage device with an adjustable negative pressure source and voltage stabilization of the present invention, the lower end section of the connecting edge is bent inward into an inverted V shape, so that a soft funnel is formed between the check valve film and the front bag film; a rigid spacer for preventing the vertical bending of the soft funnel is provided between the check valve film and the rear bag film, and the lower edge of the spacer is lower than the lower edge of the soft funnel.

[0012] As an improvement to the technical solution of the drainage device with an adjustable negative pressure source and voltage stabilization of the present invention, the drainage device with an adjustable negative pressure source and voltage stabilization further includes a pressure control port provided on the top cover and a pressure control tube hermetically docked with the pressure control port. A partition is provided in the rigid housing to divide its inner cavity into a pressure control cavity and a liquid accumulation cavity that communicate with each other at the top. The end of the pressure control tube extends into the bottom of the pressure control cavity, and the liquid pouring port is located at the rear side of the top of the liquid accumulation cavity.

[0013] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, a upper partition extends downward from the inner top surface of the top cover, the bottom end of the upper partition extends to abut against the top end of the partition, and a notch is left at the front side of the upper partition to form a horizontal through port communicating the pressure control chamber and the liquid accumulation chamber.

[0014] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, the partition in the rigid housing extends to the inner top surface of the top cover, and a notch is left at the front side to form a horizontal through port communicating the pressure control chamber and the liquid accumulation chamber.

[0015] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, a decompression water injection port located on the top cover is provided above the pressure control chamber.

[0016] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, the decompression water injection port protrudes outward to form an exhaust nozzle, and the exhaust nozzle is sleeved with a top cover.

[0017] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, the switching valve has an outlet located above the liquid accumulation chamber on the bottom surface of the top cover, and its valve core is adjusted by a rotating handle to control the opening and closing of the drainage channel; the outlet includes a left outlet and a right outlet, the left outlet is hermetically connected with a water seal pipe extending to the bottom of the liquid accumulation chamber, and the right outlet extends out of the drainage nozzle and is hermetically sleeved with a movable valve flap; the rotation of the valve core can selectively control the communication between the left outlet or the right outlet and the upper end outlet, or close the drainage passage of the switching valve.

[0018] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, an inverted V-shaped notch is provided at the lower end of the water seal pipe; an inverted V-shaped notch is provided at the lower end of the pressure control pipe.

[0019] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, the pressure regulating valve is a stepless regulating valve, which includes a tube column extending outward, a tube cap spirally sleeved with the tube column, and a valve core fixed inside the tube cap and extending into the tube column.

[0020] As an improvement to the technical solution of the drainage device with adjustable negative pressure source and voltage stabilization of the present invention, a fence-shaped cross beam is provided at the rear side of the top cover for the suspension part at the top of the liquid storage soft bag to be wound and connected to form a suspension structure, so that the top of the liquid storage soft bag is stably connected to the cross beam at the rear side of the top cover; an upward protruding hanging ear is provided on the upper side surface of the top cover.

[0021] The beneficial effects of the present invention are as follows: a non-return film that can cover the pouring port position is provided between the front bag film and the back bag film, the upper edge and both sides of the non-return film are tightly fitted and fixedly connected with the front bag film, the non-return film is welded / welded with the front bag film connected and installed with the pouring port to form two vertically connected side edges, and then the three are flatly stacked together with the back bag film, and then the front bag film and the back bag film are welded / welded together to form a bag body, and at the same time, the upper edge of the non-return film is clamped and welded by the front bag film and the back bag film as a whole, and the non-return film can cover the pouring port during negative pressure drainage, and the lower edge of the non-return film can be separated from the front bag film. When the pouring liquid enters the bag body, the non-return film is pushed backward, so that the liquid can be injected into the liquid storage soft bag. When the hard shell is negative pressure, the non-return film is pressed forward to cover the rear side of the pouring port under the action of air pressure attraction and is sealed with the front bag film, so that the accumulated liquid in the liquid storage soft bag cannot flow back. When the negative pressure in the hard shell is drained, the negative pressure will not be transmitted to the inner cavity of the liquid storage bag. The non-return diaphragm is a thin film and does not increase the volume of the liquid storage bag, which prevents the packaging from expanding and ensures the miniaturization of specifications. At the same time, it also prevents the pressure buffer and internal pressure surge in the soft bag from being reversely transmitted to the drainage tube, affecting the stability of the drainage pressure and the drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the lateral stereoscopic structure of a drain device capable of adjusting a negative pressure source and stabilizing pressure according to the present invention.

[0023] Figure 2 for Figure 1 A schematic diagram of the forward structure of the drain with an adjustable negative pressure source and a stable pressure is shown.

[0024] Figure 3 for Figure 2 A schematic diagram of the exploded three-dimensional structure of the adjustable negative pressure source and the pressure-stabilizing drain is shown.

[0025] Figure 4 for Figure 2 The forward structural schematic diagram of the main part of the decomposed expression of the adjustable negative pressure source and the pressure-stabilizing drain is shown; both the decomposed parts contain a connecting ring cover.

[0026] Figure 5 for Figure 4 The schematic diagram of the three-dimensional structure of the drainage device main body is shown with the liquid storage soft bag portion removed and the hard shell cut away.

[0027] Figure 6 for Figure 5 The schematic diagram of the three-dimensional structure of the main part of the drainage device shown is further removed from the pressure control tube.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the top cover in the drainage device from an oblique upper perspective.

[0029] Figure 8 is Figure 7 a three-dimensional structural schematic diagram of the side lower view of the shown top cover.

[0030] Figure 9 is a three-dimensional structural schematic diagram of the bag film after the liquid storage soft bag is hidden.

[0031] Figure 10 is a disassembled three-dimensional structural schematic diagram of the liquid storage soft bag, the check valve diaphragm and the spacer, and the check valve diaphragm and the spacer are taken out and presented separately. Specific embodiments

[0032] The following further illustrates the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0033] As Figures 1 to 7 shown, a drainage device capable of adjusting the negative pressure source and stabilizing the pressure of the present invention includes a rigid housing 12 with a liquid pouring port 26 on the rear side, a liquid storage soft bag 16 hermetically docked with the liquid pouring port 26 on the front side, a top cover 13 hermetically connected to the rigid housing 12, a conversion valve 31 provided in the middle of the top cover 13, a negative pressure interface 33 provided on the top cover 13 and connected to a negative pressure source device through a negative pressure pipe, and a pressure regulating valve 32 provided on the top cover 13 and capable of adjusting the pressure difference between the inner cavity of the rigid housing 12 and the outside. The upper end outlet of the conversion valve 31 can be connected to a drainage tube 11 for intubation drainage. A flat rigid housing 12 and a liquid storage soft bag 16 are combined to form a negative pressure drainage device. The rigid housing 12 is provided with a top cover to install the pressure regulating valve 32, so that the drainage device can be miniaturized in volume. By providing the pressure regulating valve 32 and the negative pressure interface 33 connected to the negative pressure source on the top cover 13, a negative pressure with an adjustable pressure value is formed in the rigid housing 12.

[0034] Among them, the liquid storage soft bag 16 includes a front bag film 65 and a rear bag film 66, and a check valve diaphragm 62 capable of correspondingly covering the position of the liquid pouring port 26 is provided between the front bag film 65 and the rear bag film 66. One of the schemes is as Figure 3 shown, the upper edge of the check valve diaphragm 62 is tightly fitted and fixedly connected to the front bag film 65, and the two side edges of the check valve diaphragm 62 are not fixedly connected to the front bag film 65. The air in the liquid storage soft bag 16 is sucked by the action of negative pressure to make the check valve diaphragm 62 close to the front bag film 65 and stick together to prevent the liquid in the bag from flowing back. A support frame can be provided to increase the strength of the check valve diaphragm 62. Another scheme is as Figure 4 shown, the upper edge and both sides of the check valve diaphragm 62 are tightly fitted and fixedly connected to the front bag film, that is, when manufacturing, the check valve diaphragm is welded / fused with the front bag film 65 already connected and installed with the liquid pouring port, forming two vertically extending connecting edges 62a tightly fitted and fixedly connected to the front bag film, and then the three are laid flat and stacked together with the rear bag film 66, and then the peripheries of the front bag film and the rear bag film are welded / fused together to form a bag body. At the same time, the upper edge of the check valve diaphragm is clamped and fused into one body by the front bag film and the rear bag film, asFigure 9 As shown, the vertical dimension of the non-return film 62 is moderate so that it can cover the pouring port 26, and the lower edge of the non-return film 62 is separable from the front bag film and the rear bag film. When the liquid is poured into the bag body, the lower section of the non-return film 62 that is loose is pushed back to open the pouring port 26, so that the liquid can be poured into the liquid storage soft bag 16. When the hard shell 12 is under negative pressure, the non-return film 62, which is narrower than the front bag film 65, covers the pouring port 26 forward under the action of air pressure attraction, and the non-return film and the front bag film are attached to form a seal, so that the accumulated liquid in the liquid storage soft bag 16 cannot flow back. During gravity drainage, when the liquid storage soft bag 16 contains liquid, the front bag film 65 and the rear bag film 66 can be stretched open to keep the anti-return membrane 62 and the rear bag film 66 separated. Under the action of negative pressure drainage, the anti-return membrane 62 covers the inner side of the liquid pouring port 26 and is sealed with the front bag film 65.

[0035] The front side of the liquid storage soft bag 16 is provided with an opening corresponding to the pouring port 26 and a connecting ring cover 18 is provided to be sealed and welded with the front bag film 65 of the liquid storage soft bag, and the connecting ring cover 18 and the pouring port 26 are also sealed. The hard shell 12 is transparent, which is convenient for observing the internal capacity. The hard shell 12 can be set to a bucket shape with front and back flat shapes, which is convenient for arranging it in parallel with the rear side liquid storage soft bag 16, reducing the excessive squeezing of the hard shell 12 on the liquid storage soft bag 16 that stores a certain amount of accumulated fluid.

[0036] During use, the lower end of the hard shell 12 can be lifted to pour the drained liquid from the pouring port 26 into the liquid storage bag 16. When the drainage continues, the negative pressure in the hard shell 12 will not be transmitted to the liquid storage bag 16, so that the accumulated liquid will not be squeezed and flow back into the hard shell 12. The capacity of the liquid storage bag 16 is many times that of the hard shell 12, so that the small-volume hard shell 12 can be combined with the liquid storage bag 16 for continuous negative pressure drainage. The miniaturized hard shell 12 is more likely to generate negative pressure, and the generated negative pressure is very stable and reliable. During this period, the accumulated liquid retained in the liquid storage bag 16 can also be released and emptied, thereby extending the time of using the negative pressure drainage device.

[0037] The connecting edges 62a of the two sides of the anti-return film 62 and the front bag film 65 extend vertically and the lower end section is bent inwardly to form an inverted eight-shaped shape, such as Figure 9 , Figure 10As shown, the check diaphragm 62 and the front bag film 65 surround the liquid pouring port 26 and the ring cover 18 at a position exceeding 270°, including the upper side, the left and right sides, and the inner swing bending part on the lower side of the connecting edge, thus forming a soft funnel. That is, the inverted V-shaped closing inner swing bending connecting edge constructs a bottleneck for the flow of the drainage liquid. When the accumulated liquid flows from the liquid pouring port 26 to the bag body, it is easy to push open the check diaphragm 62 to form a connected flow channel; when a negative pressure is formed in the reverse direction, there are fewer separable positions between the check diaphragm 62 and the front bag film 65, and it is not easy to be displaced, so it is relatively easy to fit and seal. Even if the check diaphragm 62 is partially recessed into the liquid pouring port, it does not affect the sealing effect.

[0038] When the rigid housing 12 is lifted to pour liquid into the liquid storage soft bag 16 at the rear side, due to the existence of the inverted V-shaped bonding structure connecting edge, it is easy to form a vertical bend at this position, forming a horizontally extending curved surface, so that the check diaphragm 62 and the front bag film 65 cannot be separated, resulting in the inability to open and form a liquid pouring channel. A rigid spacer 63 for preventing the vertical bending of the soft funnel is provided between the check diaphragm 62 and the rear bag film 66 of the present invention. The lower edge of the spacer 63 is lower than the lower edge of the soft funnel. Thus, when pouring liquid, the lower edge of the spacer 63 is squeezed downward by the front bag film 65 to separate the spacer 63 from the check diaphragm 62 to form a separation gap space, which is convenient for the check diaphragm 62 to open backward. Moreover, the lower edge of the spacer 63 abuts against the check diaphragm 62 to prevent it from forming a bend, ensuring that the check diaphragm 62 and the front bag film 65 can be opened to form a liquid pouring channel. The material of the check diaphragm 62 is a smooth film.

[0039] Among them, the adjustable negative pressure source and the pressure-stabilized drainage device further include a pressure control port 35 provided on the top cover 13 and a pressure control tube 25 that is hermetically docked with the inner end of the pressure control port 35. A partition 21 is provided inside the rigid housing 12 to divide its inner cavity into a pressure control cavity 22 and a liquid accumulation cavity 23 that communicate with each other at the top. The end of the pressure control tube 25 extends into the bottom of the pressure control cavity 22, and the liquid pouring port 26 is located at the rear side of the top of the liquid accumulation cavity 23. A partition 21 is provided inside the rigid housing to divide its inner cavity into a pressure control cavity 22 and a liquid accumulation cavity 23 that communicate with each other at the top. A certain amount of water is injected into the pressure control cavity, and the pressure control tube 25 is inserted below the liquid level of the pressure control cavity 22. The upper opening of the pressure control tube 25 communicates with the outside, so as to control the pressure difference between the cavity negative pressure in the pressure control cavity and the natural air outside through the height of the water level. When the difference exceeds the pressure value formed by the water column height of the water level in the pressure control cavity 22, the outside air is sucked into the pressure control cavity. By setting the water level height to correspond to setting its pressure value, without setting a pressure gauge, when accessing the negative pressure source of the central negative pressure device, the pressure regulating valve 32 at the top cover can be adjusted accordingly to adjust the negative pressure value in the liquid accumulation cavity 23 (equal to the pressure value of the pressure control cavity 22), so that it is equal to or less than the pressure value set by the water level height. When exceeding this pressure value, air is sucked in and bubbles are formed in the pressure control cavity 22 to produce a gurgling sound. Thus, without a negative pressure gauge and without knowing the specific negative pressure value introduced, the negative pressure can also be adjusted by the height of the water level, and the negative pressure values of the air in the pressure control cavity 22 and the liquid accumulation cavity 23 can be set. When the absolute value of the pressure provided by the central negative pressure device is too high and exceeds the conventional 15 KPA, air can be introduced from the pressure control tube 25 to reduce the internal negative pressure value and avoid accidental damage caused by the negative pressure value exceeding the limit and causing pressure impact on the body cavity of the drained human body. Among them, at the pressure control tube 25, a water level of 10 cm can provide a pressure difference of about 1 KPA. Using this pressure difference, the pressure difference value can be compared with the negative pressure value in the pressure control cavity 22, and air can be sucked in through the pressure control tube 25 to reduce the negative pressure value in the pressure control cavity 22 so that it does not exceed the pressure difference value generated by the water level height, thereby limiting the negative pressure in the cavity from being too high.

[0040] The drainage device is provided with a pressure control tube and a pressure regulating valve, and can be used by connecting to a negative pressure source or directly used without connecting to a negative pressure source. In the case of no negative pressure source, the position of the drainage device can be lowered to perform natural drainage.

[0041] Among them, combined with Figure 8As shown, the inner top surface of the top cover 13 extends downward to form an upper partition plate 34. The bottom end of the upper partition plate 34 extends to abut against the top end of the partition plate 21, and a notch is left at the front side of the upper partition plate 34 to form a horizontal through-port 73 communicating the pressure control chamber 22 and the liquid accumulation chamber 23. Alternatively, the partition plate 21 in the rigid housing extends to the inner top surface of the top cover 13, and a notch is left at the front side to form a horizontal through-port 73 communicating the pressure control chamber 22 and the liquid accumulation chamber 23. That is, the rear side of the spacer extends all the way to the top surface of the liquid accumulation chamber 23, so that when the liquid is poured out from the liquid pouring port 26 at the rear side, the liquid will not flow into the pressure control chamber 22 when it overflows to the top, and the water in the pressure control chamber 22 will not flow into the liquid accumulation chamber 23, thus avoiding the cross-flow and mixing between the liquid and the water, and ensuring the stability of the water level and the stability of the provided pressure difference. The horizontal through-port 73 enables the air flow communication between the pressure control chamber 22 and the liquid accumulation chamber 23 and maintains the same air pressure. The negative pressure in the pressure control chamber 22 is equal to the negative pressure in the liquid accumulation chamber 23. Controlling the negative pressure in the pressure control chamber controls the negative pressure in the liquid accumulation chamber 23.

[0042] Among them, a pressure-reducing water injection port 36 is provided above the pressure control chamber 22 and is located on the top cover 13. The pressure-reducing water injection port 36 can be adaptively connected to a water injection funnel 88. Clear water is injected into the pressure control chamber 22 through the water injection funnel 88 to form a certain water level height and form a set pressure difference. This pressure difference can be used for comparison and reference to adjust the regulating valve 32 to set an appropriate negative pressure in the rigid housing cavity. The basis is that when just a bubble enters the lower end of the pressure control tube, the negative pressure in the cavity is equal to the pressure of the water level difference, that is, equal to the height difference between the water level in the pressure control chamber and the lower end of the pressure control tube as the water level difference.

[0043] In addition, the pressure-reducing water injection port 36 can also serve as a pressure-reducing air hole. The negative pressure value of the medical central negative pressure device is generally 15 kPa. It is very difficult to directly reduce the negative pressure value of the air pressure to 1.0 kPa through the regulating valve. By setting the pressure-reducing air hole, the negative pressure value can be halved and fall back to about 7 kPa, thus reducing the regulating difficulty of the regulating valve and also reducing the requirement for the pressure-bearing strength of the rigid housing 12. Usually, thoracic surgery will cause air leakage outside the thoracic cavity and lungs, which needs to be discharged. When the pressure-reducing water injection port is opened, when the person being drained coughs or the like, the pressure in the liquid accumulation chamber of the rigid housing and the thoracic cavity will increase instantaneously, and the air pressure can also be released through the pressure-reducing water injection port, thus avoiding damage caused by the inability to release the internal gas pressure. When using this body cavity drainage device for gravity drainage, opening the pressure-reducing water injection port 36 also plays a role in exhausting air. That is, this pressure-reducing water injection port 36 has three functions: adding liquid, regulating pressure, and exhausting air when there is no negative pressure.

[0044] Furthermore, when reducing the size specification of the rigid housing 12, to maintain a relatively moderate volume of the liquid accumulation cavity 23, the relative volume of the pressure control cavity 22 is small, and it is only necessary to be able to insert the pressure control tube 25. If a pressure control tube with a very small diameter is selected, there will be an air flow resistance of the pressure control tube, affecting the actual drainage negative pressure value. Selecting a pressure control tube with a larger diameter so that its air flow resistance can be ignored, a certain amount of water can be accommodated in its internal lumen. If clear water is injected from the pressure control port, when there is no negative pressure at rest, the water level in the pressure control tube 25 remains the same as the water level outside the tube. When adjusting the negative pressure to the set negative pressure, after discharging the clear water in the pressure control tube 25 outside the tube, the water level in the pressure control cavity 22 outside the tube increases, resulting in a negative pressure value larger than the required set pressure value, increasing the difficulty of negative pressure setting. With the increase of this pressure threshold, it is impossible to avoid the damage caused by negative pressure exceeding a certain value (destructive) to the body cavity of the human body being drained. By providing an additional decompression water injection port 36, the decompression water injection port can be arranged at the pressure control cavity 22 corresponding to the outside of the pressure control tube 25. When setting the water level difference, first close the upper end of the pressure control tube to make it airtight, and then pour clear water from the decompression water injection port 36. Then the clear water will enter the pressure control cavity 22 but will not enter the inner cavity of the pressure control tube 25, directly setting the water level difference between the bottom end of the pressure control tube 25 and the water surface, which can be measured directly and visually inspected for preliminary judgment.

[0045] Further, the decompression water injection port 36 protrudes outward to form an exhaust nozzle, and a top cover is sleeved on the exhaust nozzle to protect the exhaust nozzle and can also close the air inlet here when a low negative pressure air source provided by the outside world is available. The decompression water injection port 36 is also an exhaust port. For example, in the case of natural drainage, it is necessary to open the exhaust port, otherwise the regulating valve 32 needs to be adjusted to a larger opening or even fully opened. The decompression water injection port 36 effectively increases the total adjustment stroke, with a larger adjustment range and higher precision.

[0046] Among them, the conversion valve 31 has an outlet on the bottom surface of the top cover 13 above the liquid accumulation cavity 23, and its valve core 55 is adjusted by a rotating handle 59 to control the opening and closing of the drainage channel. When opened, it can conduct the drainage of liquid and gas between the human body cavity and the liquid accumulation cavity 23, and when closed, it cuts off the drainage channel. Further, the outlet includes a left outlet 52 and a right outlet 53. The left outlet 52 is hermetically connected to a water seal pipe 28 extending into the bottom of the liquid accumulation cavity, and the right outlet 53 extends out of the drainage nozzle and is hermetically sleeved with a movable valve flap 54; the rotation of the valve core can selectively control the communication between the left outlet 52 or the right outlet 53 and the upper end outlet 51, or close the drainage passage of the conversion valve 31. A flow channel is provided in the valve core 55 in the shape of a rotating body. The flow channel has a long strip-shaped upper opening 58 and a circular lower opening 56 on the circumferential surface of the valve core 55. The lower opening 56 can be aligned with the left outlet 52, the right outlet 53, and the middle blocking surface respectively during the rotation of the valve core 55, while the long strip-shaped upper opening 58 is always communicated with the upper end outlet 51, so that the channel can be switched or closed. The movable valve flap 54 will close when the front and rear membranes are attached under the action of external pressure, and is arranged in the liquid accumulation cavity 23 with negative pressure, and it can always be opened for drainage; when the negative pressure value in the body cavity exceeds the negative pressure in the liquid accumulation cavity 23, the movable valve flap 54 will also be closed to prevent backflow. It will close when the liquid submerges the lower edge of the movable valve flap 54; the movable valve flap 54 can naturally relax and close under the condition of natural drainage and no negative pressure in the liquid accumulation cavity 23. When the conversion valve 31 is rotated to communicate with the water seal pipe 28, natural drainage can be carried out, and a water seal is formed when the liquid accumulates and submerges the lower end opening of the water seal pipe.

[0047] When draining through the passage of the movable valve flap 54, the negative pressure in the liquid accumulation cavity 23 plays an auxiliary role, which is beneficial to the relaxation of the lungs and the extrusion of the gas remaining in the body cavity outside the lungs.

[0048] Further, the lower end of the water seal pipe 28 is provided with an inverted V-shaped incision; the lower end of the pressure control pipe 25 is provided with an inverted V-shaped incision. The inverted V-shaped incision can prevent foreign objects from blocking the pipe orifice, and local blockage does not prevent inhalation and exhalation, thereby preventing the failure of pressure control / water seal, and can be more conducive to the entry of gas into the pressure control cavity 22 / liquid accumulation cavity 23, and the pressure control is more accurate.

[0049] Among them, in combination with Figure 5 、 Figure 7As shown, the pressure regulating valve 32 is a stepless regulating valve, which includes a column 82 extending outward, a pipe cap 83 spirally sleeved with the column 82, and a valve core fixed inside the pipe cap 83 and extending into the column 82. The column 82 is in the shape of a cylinder with an inner through hole 81. The valve core is cylindrical or conical and is fixedly connected to the pipe cap 83 through ribs. The top of the pipe cap 83 is provided with an open mouth, and the column 82 has a tapered opening. By rotating the pipe cap 83, the axial position of the valve core can be adjusted. The valve core can be adapted to extend into the tapered opening to control the size of the air flow gap until the air flow channel is locked, thereby constructing a regulating valve that can be closed or opened wider. Different from the pressure reducing nozzle that only opens and reduces a certain range, this steplessly adjustable air valve can be adjusted to a suitable internal air pressure and can be used as a secondary pressure regulation. When the exhaust nozzle at the pressure reducing water injection port is opened, the 15 kPa air pressure provided by the system is reduced to 7-8 kPa to achieve a fixed-range primary pressure reduction; then, by adjusting this pressure regulating valve, the air pressure can be further reduced to about 1 kPa to complete the secondary pressure regulation. The secondary pressure regulation can flexibly adjust and select different negative pressure values as required.

[0050] Among them, a fence-shaped cross beam 37 is provided at the rear side of the top cover 13 for the suspension part at the top of the liquid storage soft bag 16 to surround and connect to form a suspension structure. A long slot 38 is formed between the cross beam 37 and the top cover body part. The suspension part extending from the top of the liquid storage soft bag 16 passes through the slot and surrounds the cross beam 37, so that the liquid storage soft bag 16 can be hung on the fence-shaped cross beam 37, forming a drainage device in which the hard shell 12 and the liquid storage soft bag 16 are arranged side by side front and back, making the top of the liquid storage soft bag 16 stably connected to the cross beam 37 at the rear side of the top cover 13. Combined with the bonding and welding connection structure at the liquid pouring port 26, the hard shell 12 and the liquid storage soft bag 37 form a stable connection combination of the drainage device, and their positions are relatively stable and will not shake or produce relative position slippage.

[0051] An upwardly protruding hanging ear 39 is provided on the upper side of the top cover 13, which is convenient for hanging the drainage device at a suitable position by connecting with a hanging strap 68.

[0052] Among them, the negative pressure interface 33 is provided with a plug for plugging the outer end opening, which can separate the inside and outside of the joint to prevent pollution and affect the use in the case of not in use. The pressure control port 35 protrudes outward to form an exhaust nozzle 85, and a cap 86 is sleeved on the exhaust nozzle 85 to protect the exhaust nozzle 85.

[0053] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A drainage device capable of adjusting the negative pressure source and stabilizing the pressure, comprising a rigid housing with a liquid pouring port on the rear side, a liquid storage soft bag with its front side hermetically docked with the liquid pouring port, a top cover hermetically connected to the rigid housing, and a conversion valve provided in the middle of the top cover, characterized in that: It further includes a negative pressure interface provided on the top cover and connected to a negative pressure source device through a negative pressure pipe, and a pressure regulating valve provided on the top cover and capable of adjusting the pressure difference between the inner cavity of the rigid shell and the outside. The upper end outlet of the switching valve can be connected to a drainage tube; the liquid storage flexible bag includes a front bag film and a rear bag film, and a check valve film capable of correspondingly covering the liquid pouring port is provided between the front bag film and the rear bag film. The upper edge of the check valve film is tightly and fixedly connected to the front bag film, and the lower edge of the check valve film is separable from the front bag film.

2. The drainage device with adjustable negative pressure source and voltage stabilization according to claim 1, characterized in that: Both sides of the check valve film are also tightly and fixedly connected to the front bag film to form a vertically extending connecting edge.

3. The drain device with adjustable negative pressure source and voltage stabilization according to claim 2, characterized in that: The lower end segment of the connecting edge is bent inward to form an inverted V shape, so that a soft funnel is formed between the check valve film and the front bag film; a rigid partition is provided between the check valve film and the rear bag film to prevent the vertical bending of the soft funnel, and the lower edge of the partition is lower than the lower edge of the soft funnel.

4. The drainage device with adjustable negative pressure source and voltage stabilization according to claim 1, characterized in that: It further includes a pressure control port provided on the top cover and a pressure control pipe hermetically docked with the pressure control port. A partition is provided in the rigid shell to divide its inner cavity into a pressure control cavity and a liquid accumulation cavity that communicate with each other at the top. The end of the pressure control pipe extends into the bottom of the pressure control cavity, and the liquid pouring port is located at the rear side of the top of the liquid accumulation cavity.

5. The drainer with adjustable negative pressure source and voltage stabilization according to claim 1, characterized in that: An upper partition extends downward from the inner top surface of the top cover, and the bottom end of the upper partition extends to abut against the top end of the partition. And a notch is left at the front side of the upper partition to form a horizontal through port communicating the pressure control cavity and the liquid accumulation cavity.

6. The drainage device with adjustable negative pressure source and voltage stabilization according to claim 1, characterized in that: The partition in the rigid shell extends to the inner top surface of the top cover, and a notch is left at the front side to form a horizontal through port communicating the pressure control cavity and the liquid accumulation cavity.

7. The drainage device with adjustable negative pressure source and voltage stabilization according to claim 1, wherein: A pressure reducing water injection port is provided above the pressure control cavity on the top cover.

8. The adjustable negative pressure source and voltage-stabilized drainage device according to claim 7, wherein: The pressure reducing water injection port protrudes outward to form an exhaust nozzle, and the exhaust nozzle is sleeved with a top cover.

9. The drainage device with adjustable negative pressure source and voltage stabilization according to claim 1, characterized in that: The switching valve has an outlet above the liquid accumulation cavity on the bottom surface of the top cover, and its valve core is adjusted by a rotating handle to control the opening and closing of the drainage channel; the outlet includes a left outlet and a right outlet. The left outlet is hermetically connected with a water seal pipe extending into the bottom of the liquid accumulation cavity, and the right outlet extends out a drainage nozzle and is hermetically sleeved with a living valve; the rotation of the valve core can selectively control the connection of the left outlet or the right outlet with the upper end outlet, or close the drainage passage of the switching valve.

10. The drainer with adjustable negative pressure source and voltage stabilization according to claim 9, characterized in that: An inverted V-shaped cut is provided at the lower end of the water seal pipe; an inverted V-shaped cut is provided at the lower end of the pressure control pipe.

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