Perioperative period waste liquid collection system with buffer device

Abstract

The invention discloses a perioperative period waste liquid collection system with a buffer device, and belongs to the technical field of medical instruments. According to the invention, a buffer device is added, and the device is made of plastic and rubber materials, so that damage to red blood cells caused by metal materials used by a traditional mechanical structure can be avoided; the two-stage rubber plugs of the petal-shaped structure and the umbrella-shaped structure are closed and opened under the action of negative pressure, so that buffer suction of blood is realized; meanwhile, a silencing device is additionally arranged at the tail end of the vacuum pump, and silencing of the vacuum pump is achieved through a porous structure and change of a gas circulation path.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a perioperative waste liquid collection system with a buffer device. Background Art

[0002] Existing commonly used collection systems can generate relatively large surface tension and shear stress, resulting in red blood cell breakage; most vacuum pump silencers use a method of filling sound-absorbing cotton and cannot act on the inside of the blood collection device; moreover, a silencing device is mostly provided at the end and cannot solve the noise problem near the vacuum pump inside the device. Summary of the Invention

[0003] The present invention proposes to add a buffer device to a traditional negative pressure blood recovery system. This device is made of plastic and rubber materials, which can avoid the damage to red blood cells caused by using metal materials in traditional mechanical structures; the present invention realizes the buffered suction of blood through the closing and opening processes of two-stage rubber plugs with a petal-shaped structure and an umbrella-shaped structure under negative pressure; at the same time, the present invention also adds a silencing device at the end of the vacuum pump, and realizes the silencing of the vacuum pump through a porous structure and changing the gas flow path.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A perioperative waste liquid collection system with a buffer device, comprising a buffer device, a negative pressure suction device and a blood storage tank; the negative pressure interface 32 of the blood storage tank 3 is connected to the air inlet 27 of the negative pressure suction device 2; the blood inlet 31 of the blood storage tank is connected to the air outlet of the buffer device; a silencer 22 is provided at the air outlet at the end of the negative pressure suction device 2;

[0006] The silencer includes a silencer housing 221, a silencing end cap 225 and an umbrella valve 223; the silencing end cap is installed at the bottom end of the silencer housing, and the silencer housing and the silencing end cap are respectively provided with an air inlet channel and an air outlet channel; the main body of the umbrella valve seat is a horizontal plate fixed inside the silencer housing, and a connection hole for cooperating with the umbrella valve is provided thereon; the handle of the umbrella valve is located in the connection hole, and the umbrella cover of the umbrella valve buckles on the air duct on the horizontal plate and realizes sealing; when the pressure on the convex surface side of the umbrella cover is less than the pressure on the concave surface side, the umbrella cover deforms and the sealed air duct opens.

[0007] Furthermore, the buffer device includes a housing, an umbrella-shaped plug, a flow guide ring and a buffer plug;

[0008] The umbrella-shaped plug, the flow guide ring and the buffer plug are all located inside the housing, and the central axes of the four coincide; the two ends of the housing are respectively an air inlet and an air outlet;

[0009] The flow guide ring is closely attached to the inner wall of the housing; a flow channel is provided on the flow guide ring; one side of the flow guide ring is close to the air inlet and there is a distance greater than zero between the flow guide ring and the air inlet; the umbrella cover of the umbrella plug is buckled on the other side of the flow guide ring to seal the flow channel of the flow guide ring.

[0010] The main body of the buffer plug is a flower-shaped head, and a liquid outlet is provided on the flower-shaped head; when the flower-shaped head is in the retracted state, the liquid outlet is closed; when the flower-shaped head is in the expanded state, the liquid outlet is opened; the buffer plug is located on the other side of the flow guide ring, and a chamber four is formed between the inner side of the flower-shaped head and the flow guide ring; a chamber two is formed between the outer side of the flower-shaped head and the housing.

[0011] Further, both the umbrella plug and the umbrella valve include an umbrella handle and an umbrella cover; one end of the umbrella handle is connected to the center of the umbrella cover, and the other end of the umbrella handle of the umbrella plug passes through the central hole of the flow guide ring and forms a seal.

[0012] Further, the housing is respectively divided into two parts: an air inlet end housing and an air outlet end housing; the air inlet end housing and the air outlet end housing are welded by high-frequency technology.

[0013] Further, the flow guide ring and the air inlet end housing cooperate to form a chamber one; there is a stepped structure at the end of the air inlet end housing for accommodating the outer edge of the flow guide ring and cooperating with the air outlet end housing to clamp the outer edge of the flow guide ring.

[0014] Further, tapered joint parts are provided on both the air inlet end housing and the air outlet end housing; the air inlet and the air outlet both penetrate through the corresponding tapered joint parts.

[0015] Further, the buffer plug includes a barrel wall and a flower-shaped head, and the flower-shaped head is located at one end of the barrel wall and is connected; the chamber four is composed of two parts of space, one is the internal space of the flower-shaped head, and the other is the space formed by the barrel wall and the flow guide ring.

[0016] Further, the cross-section of the umbrella valve seat is H-shaped, including a cylindrical side wall and a transverse plate, and the transverse plate is located in the cylindrical side wall and the central axes of the two coincide; the outer side of the cylindrical side wall is closely attached to the inner wall of the muffler housing.

[0017] Further, an umbrella valve cover is also provided inside the muffler housing; the umbrella valve cover is a cylindrical structure and is located on the back side of the umbrella cover of the umbrella valve; one end of the umbrella valve cover is connected to the umbrella valve seat, and the other end extends along the central axis of the muffler housing and a muffling hole a is provided at the end.

[0018] Further, an air cylinder structure is provided on the inner end face of the muffling end cover; an opening for inserting a part of the umbrella valve cover is provided above the top of the air cylinder structure, and a muffling hole b is provided on the side; a part of the umbrella valve cover is inserted into the air cylinder structure and communicates with the air cylinder structure through the muffling hole a, and the air cylinder structure communicates with the air outlet channel through the muffling hole b at its top end.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention proposes a flower-shaped blood buffer device, which realizes the buffer protection function of blood during the negative pressure suction process through the contraction and expansion of the flower-shaped head;

[0021] 2. Through the chamber and structure design of the buffer device, the present invention realizes the three-stage buffer suction of blood, greatly reduces the surface tension of blood flow, and realizes the protection of red blood cells;

[0022] 3. Through a flow channel design, the present invention realizes the silencer design at the air outlet end of the negative pressure device, and cooperates with the silencer at the air outlet end of the vacuum pump to achieve a two-stage silencing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the perioperative waste liquid collection system with a buffer device according to an embodiment of the present invention. Figure 2 is a schematic diagram of the internal structure of the perioperative waste liquid collection system with a buffer device according to an embodiment of the present invention.

[0024] Figure 3 is a schematic cross-sectional view of the buffer device (contraction) according to an embodiment of the present invention.

[0025] Figure 4 is a schematic cross-sectional view of the buffer device (dilation) according to an embodiment of the present invention

[0026] Figure 5 is a schematic cross-sectional view of the silencer according to an embodiment of the present invention.

[0027] In the figure: 1. Buffer device; 11. Outer shell; 111. Chamber one; 112. Intake end housing; 113. Outlet end housing; 114. Chamber two 12. Umbrella-shaped plug; 121. Umbrella handle; 122. Umbrella cover; 13. Guide ring; 131. Flow channel; 132. Chamber three; 133. Buckle; 14. Buffer plug; 141. Chamber four; 1421. Flower-shaped head (closed); 1422. Flower-shaped head (open); 143. Liquid outlet; 2. Negative pressure suction device; 21. Vacuum pump; 22. Silencer; 221. Silencer outer shell; 222. Umbrella valve seat; 223. Umbrella valve; 224. Umbrella valve cover; 225. Silencing end cover; 23. Silencing filter; 24. Boat-shaped switch; 25. Knob; 26. Display panel; 27. Intake port; 28. Pressure sensor; 3. Blood storage tank; 31. Blood inlet; 32. Negative pressure interface. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will describe the technical solutions in the embodiments of the present invention in detail with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] The main object of the present invention is to provide a suction system and a device for buffering blood in the suction system.

[0030] Refer to Figures 1 to 5 , this embodiment provides a perioperative waste liquid collection system with a buffer device, including a buffer device 1, which includes an elastic air inlet housing 112 and an air outlet housing 113; an umbrella-shaped plug 12, which includes an umbrella handle 121 and an umbrella cover 122; a guide ring 13, which includes a flow channel 131; a buffer plug 14, which includes a flower-shaped head 142 and a liquid outlet 143; a negative pressure suction device 2, which includes a vacuum pump 21; a silencer 22, which includes a silencer housing 221, an umbrella valve seat 222, an umbrella valve 223, an umbrella valve cover 224, and a silencing end cover 225; a silencing filter 23; a boat-shaped switch 24; a knob 25; a display panel 26; an air inlet 27; a pressure sensor 28; a blood storage tank 3, which includes a blood inlet 31; and a negative pressure interface 32.

[0031] The working principle of the perioperative waste liquid collection system with a buffer device is as follows: First, turn on the boat-shaped switch 24 to connect the negative pressure suction device 2 to the power supply; rotate the knob 25 to set the required negative pressure value, which is displayed on the display panel 26, and press the knob 25, then the negative pressure suction device 2 starts to work;

[0032] Connect the negative pressure interface 32 of the blood storage tank 3 to the air inlet 27 of the negative pressure suction device 2; gradually extract the air inside the blood storage tank 3 to present a negative pressure;

[0033] Connect the tail end of the air outlet housing 113 to the blood inlet 31 of the blood storage tank 3; after the gas inside the second chamber 114 is gradually emptied, the flower-shaped head 142 gradually expands; at the same time, the liquid outlet 143 opens, and the plane where the liquid outlet 143 is located closely adheres to the inner wall plane of the air outlet housing 113, and the gas inside the fourth chamber 141 starts to be pumped out; after the gas inside the fourth chamber 141 is gradually emptied, the flower-shaped head 142 gradually retracts; at the same time, the umbrella cover 122 flips open, and the air inside the third chamber 132 and the first chamber 111 connected to it through the flow channel 131 starts to be pumped out; after the gas inside the third chamber 132 is gradually emptied, the umbrella cover 122 flips back. When the tail end of the air inlet housing 112 is connected to the human blood waste liquid, the blood will enter the inside of the first chamber 111, the flow channel 131, and the third chamber 132 under the action of atmospheric pressure; the pressure inside the third chamber 132 gradually increases, and the umbrella cover 122 flips open under the action of the pressure difference, and the blood enters the inside of the fourth chamber 141 through the third chamber 132; the pressure inside the fourth chamber 141 gradually increases, and the flower-shaped head 142 gradually expands; at the same time, the liquid outlet 143 opens, and the plane where the liquid outlet 143 is located closely adheres to the inner wall plane of the air outlet housing 113, and the blood is discharged through the tail end of the air outlet housing 113; after the inside of the fourth chamber 141 is gradually emptied, the flower-shaped head 142 gradually retracts, and a complete working process ends.

[0034] The buffer device 1 functions to buffer and suck the blood through the cooperation of the internal chamber with the umbrella-shaped plug 12 and the flower-shaped head 142.

[0035] The outer shell 11 functions to accommodate the umbrella-shaped plug 12, the guide ring 13, and the buffer plug 14. It includes two parts, the air inlet housing 112 and the air outlet housing 113, and the two parts are welded by high-frequency technology.

[0036] The first chamber 111 functions to buffer the inflowing blood for the first time to prevent a large surface tension from being formed due to too fast a flow rate. The blood flows in through the tail end of the air inlet housing 112 and is buffered in the first chamber 111. The first chamber 111 no longer receives blood until the content is discharged and a negative pressure is re-established.

[0037] The air inlet housing 112 functions to accommodate and clamp the guide ring 13 and cooperate with the guide ring 13 to form the largest possible first chamber 111. There is a step structure at its end, which can accommodate the outer edge of the guide ring 13 and cooperate with the air outlet housing 113 to clamp the guide ring 13. There is a tapered joint structure at its tail end, which can accommodate the inflow of blood and gas.

[0038] The air outlet housing 113 functions to accommodate the buffer plug 14 and cooperate with the air inlet housing 112 to clamp the guide ring 13. The end of it presses the outer edge of the guide ring 13 to prevent the guide ring 13 from shifting under the action of the pressure difference. There is a tapered joint structure at its tail end, which can accommodate the outflow of blood and gas.

[0039] Chamber Two 114 functions to maintain a negative pressure and cooperate with Chamber Four 141 to control the expansion and closing of the flower-shaped head 142. When the air outlet end housing 113 is connected to a negative pressure source, Chamber Two 114 maintains a relatively high negative pressure. Under the action of the pressure difference, the flower-shaped head 142 expands and gradually changes from the state of flower-shaped head (closed) 1421 to the state of flower-shaped head (open) 1422. After a negative pressure is established inside Chamber Four 141, the pressure difference is eliminated, and the flower-shaped head 142 gradually retracts and gradually changes from the state of flower-shaped head (open) 1422 to the state of flower-shaped head (closed) 1421.

[0040] The umbrella-shaped plug 12 functions to cooperate with the flow guiding ring 13 to perform a second buffering of the blood. After the blood is buffered in Chamber One 111, it flows into the interior of Chamber Three 132 through the flow channel 131. When the umbrella cover 122 is closed, the blood is buffered and temporarily stored in Chamber Three 132. The umbrella-shaped plug can be regarded as a bowl-shaped rubber pad in this embodiment, which has the function of preventing backflow, and the strength can be increased by arranging umbrella ribs on the rubber pad.

[0041] The umbrella handle 121 functions to fix the umbrella-shaped plug 12 and prevent the umbrella-shaped plug 12 from being pulled out of the interior of the flow guiding ring 13 under the action of the pressure difference and losing the interference fit with the flow guiding ring 13.

[0042] The umbrella cover 122 functions to perform a second buffering of the blood by opening and closing. After the blood is buffered in Chamber One 111, it flows into the interior of Chamber Three 132 through the flow channel 131. When the umbrella cover 122 is closed, the blood is buffered and temporarily stored in Chamber Three 132. When the pressure in Chamber Three 132 increases and a pressure difference is established with Chamber Four 141, the umbrella cover 122 opens, and the blood after the second buffering enters Chamber Four 141.

[0043] The flow guiding ring 13 functions to cooperate with the umbrella-shaped plug 12 to perform a second buffering of the blood. It cooperates with the umbrella-shaped plug 12 to form Chamber Three 132 and cooperates with the buffer plug 14 to form Chamber Four 141.

[0044] The flow channel 131 functions to guide the blood that has been first buffered in Chamber One 111 and enter Chamber Three 132 to achieve the second buffering. The flow channel 131 passes through the flow guiding ring 13, connects to Chamber One 111 outwardly, and connects to Chamber Three 132 inwardly.

[0045] Chamber Two 132 functions to perform a second buffering of the blood and at the same time reduce the contact area between the umbrella-shaped plug 12 and the flow guiding ring 13 to prevent the opening of the umbrella cover 122 from being affected by surface adhesion.

[0046] The buckle 133 functions to press the buffer plug 14 and prevent the buffer plug 14 from being displaced under the action of the pressure difference and losing the function of the third buffering of the blood.

[0047] The buffer plug 14 functions to cooperate with the outer shell 113 of the air outlet end to perform the third buffering of the blood. It cooperates with the diversion ring 13 to form the chamber four 141 and cooperates with the outer shell 113 of the air outlet end to form the chamber two 114.

[0048] The chamber four 141 functions to store negative pressure. After the flower-shaped head 142 closes, relying on the negative pressure stored in the chamber four 141, a pressure difference is formed with the chamber three to open the umbrella cover 122; the chamber four 141 should be maintained within a reasonable range. If the chamber four 141 is too large, the speed of establishing negative pressure is too slow, which will affect the effect of the third buffering. If the chamber four 141 is too small, the frequency of eliminating negative pressure, that is, the suction frequency, is too fast, which will cause a large amount of air bubbles to be mixed into the blood, which is not conducive to subsequent processing.

[0049] The flower-shaped head 142 functions to perform the third buffering of the blood through expansion and contraction. When the outer shell 113 of the air outlet end is connected to the negative pressure source, the chamber two 114 maintains a relatively high negative pressure. Under the action of the pressure difference, the flower-shaped head 142 expands. After negative pressure is established inside the chamber four 141, the pressure difference is eliminated, and the flower-shaped head 142 gradually retracts; during this process, the umbrella cover 122 opens, and the blood enters the chamber four 141 from the chamber three 132, and the negative pressure inside the chamber four 141 and the flower-shaped head 142 increases; the flower-shaped head expands under the action of the pressure difference between the chamber four 141 and the chamber two 114, and the plane where the liquid outlet 143 is located closely adheres to the inner wall plane of the outer shell 113 of the air outlet end, and the blood is discharged through the tail end of the outer shell 113 of the air outlet end; at the same time, negative pressure is established inside the chamber four 141, the pressure difference is eliminated, and the flower-shaped head 142 gradually retracts. The flower-shaped head in this embodiment can be regarded as having extremely small holes provided on the rubber sleeve. Due to the material of the rubber itself, the extremely small holes will not pass gas and liquid, but when the rubber sleeve expands, the extremely small holes become larger and can pass gas or liquid.

[0050] The liquid outlet 143 functions to follow the expansion and contraction of the flower-shaped head 142 to complete the third buffering and discharge of the blood. When the flower-shaped head 142 contracts, the liquid outlet 143 naturally tightens to block and buffer the blood entering the buffer plug 14; when the flower-shaped head 142 expands, the liquid outlet 143 opens under the action of the pressure difference, and the blood buffered by the buffer plug 14 is discharged through the liquid outlet 143.

[0051] The negative pressure suction device 2 functions to undertake the function of the negative pressure source and provide power for blood recovery.

[0052] The vacuum pump 21 functions to provide negative pressure. When powered by 24V DC, it can provide a maximum pressure of -90 kPa and a maximum flow rate of up to 64 L / min.

[0053] The silencer 22 functions to connect to the air outlet of the vacuum pump 21 to eliminate the noise generated when the gas at the tail end of the vacuum pump 21 passes quickly;

[0054] The silencer housing 221 is used to accommodate and fix the umbrella valve seat 222, the umbrella valve 223 and the umbrella valve cover 224, and cooperate with the silencing end cap 225 to realize the sealing of the silencer 22.

[0055] The umbrella valve seat 222 is used to fix the umbrella valve 223 and allow gas to pass through its own pore channels.

[0056] The umbrella valve 223 is used to prevent gas backflow. The umbrella valve 223 is fixed on the surface of the umbrella valve seat 222. When gas flows in from the direction of the vacuum pump 21, the umbrella valve 223 opens to allow gas to pass through; when gas backflows inside the silencer, the umbrella valve 223 closes to prevent gas from flowing back into the vacuum pump 21. In this embodiment, the umbrella valve can be regarded as a bowl-shaped rubber pad, which has the function of preventing backflow, and the strength can be increased by setting umbrella ribs on the rubber pad.

[0057] The umbrella valve cover 224 is used to provide a gas passage and achieve the first stage of gas dispersion and silencing through the uniformly distributed holes at the top.

[0058] The silencing end cap 225 is used to provide a gas passage and achieve the second stage of gas dispersion and silencing through the uniformly distributed holes at the top. There is a pagoda seal joint at the top, which can cooperate with the silencer housing 221 to complete the sealing of the silencer 22.

[0059] The silencing filter 23 is used to provide silencing at the tail end of the negative pressure suction device 2 and prevent external bacteria and the like from invading and contaminating the internal flow path.

[0060] The boat-shaped switch 24 is used to control the power on and off of the negative pressure suction device 2 and provide insurance when the negative pressure suction device 2 is overcurrent.

[0061] The knob 25 is used to increase or decrease the set negative pressure by rotation, and start and stop the negative pressure suction device 2 by pressing and lifting; when the knob 25 rotates clockwise, the set negative pressure value increases; when the knob 25 rotates counterclockwise, the set negative pressure value decreases; when the knob 25 is pressed, the negative pressure suction device 2 starts to work; when the knob 25 is lifted, the negative pressure suction device 2 stops working.

[0062] The display panel 26 is used to display the set negative pressure and the real-time negative pressure of the negative pressure suction device 2. The negative pressure value from 0 to -300 mmHg is displayed in the form of a progress bar.

[0063] The air inlet 27 is used to connect to the negative pressure interface 32 of the blood storage tank 3, so as to extract the air inside the blood storage tank 3.

[0064] The pressure sensor 28 measures the pressure near the air inlet 27 and returns the data to the control part, so as to complete the closed-loop control of the vacuum pump 21 and ensure the stability of the negative pressure value.

[0065] The blood storage tank 3 is used to collect and store the blood flowing in after being buffered by the buffer device 1.

[0066] The blood inlet 31 is used to connect to the air outlet housing 113 of the buffer device 1, receive the buffered blood, and inject it into the blood storage tank 3.

[0067] The negative pressure interface 32 is used to connect to the negative pressure suction device 2 to discharge gas, creating a negative pressure environment inside the blood storage tank 3.

Claims

1. A perioperative waste fluid collection system with a buffer device, comprising a buffer device, a negative pressure suction device and a blood storage tank; characterized in that: The negative pressure interface (32) of the blood storage tank (3) is connected to the air inlet (27) of the negative pressure suction device (2); the blood inlet (31) of the blood storage tank is connected to the air outlet of the buffer device; the air outlet at the end of the negative pressure suction device (2) is provided with a muffler (22); The silencer comprises a silencer shell (221), a silencer end cover (225) and an umbrella valve (223); the silencer end cover is installed at the bottom end of the silencer shell, and the silencer shell and the silencer end cover are respectively provided with an air inlet channel and an air outlet channel; the main body of the umbrella valve seat is a horizontal plate fixed in the silencer shell, and is provided with a connection hole for matching with the umbrella valve; the umbrella handle of the umbrella valve is located in the connection hole, and the umbrella cover of the umbrella valve is buckled on the airway on the horizontal plate to achieve blocking; when the pressure on the convex side of the umbrella cover is less than the pressure on the concave side, the umbrella cover is deformed and the blocked airway is opened.

2. A perioperative waste fluid collection system with a buffer device according to claim 1, characterized in that: The buffer device comprises a shell, an umbrella-shaped plug, a guide ring and a buffer plug; The umbrella-shaped plug, the guide ring and the buffer plug are all located in the shell, and the central axes of the four coincide with each other; the two ends of the shell are respectively an air inlet and an air outlet; The guide ring is in close contact with the inner wall of the housing; a flow channel is provided on the guide ring; one side of the guide ring is in close contact with the air inlet and a distance greater than zero is formed between the guide ring and the air inlet; the umbrella cover of the umbrella-shaped plug is buckled on the other side of the guide ring to form a seal for the flow channel of the guide ring; The main body of the buffer plug is a flower-shaped head, which is provided with a liquid outlet; when the flower-shaped head is in a retracted state, the liquid outlet is closed; when the flower-shaped head is in an expanded state, the liquid outlet is open; the buffer plug is located on the other side of the guide ring, and a chamber four is formed between the inner side of the flower-shaped head and the guide ring; and a chamber two is formed between the outer side of the flower-shaped head and the outer shell.

3. A perioperative waste fluid collection system with a buffer device according to claim 2, characterized in that: The umbrella-shaped plug and the umbrella valve both include an umbrella handle and an umbrella cover; one end of the umbrella handle is connected to the center of the umbrella cover, and the other end of the umbrella handle of the umbrella-shaped plug passes through the center hole of the guide ring to form a seal.

4. A perioperative waste fluid collection system with a buffer device according to claim 2, characterized in that: The shell is composed of two parts: an air inlet shell and an air outlet shell; the air inlet shell and the air outlet shell are welded by a high-frequency process.

5. A perioperative waste fluid collection system with a buffer device according to claim 4, characterized in that: The guide ring cooperates with the air inlet end shell to form a chamber 1; there is a step structure at the end of the air inlet end shell, which is used to accommodate the outer edge of the guide ring and cooperate with the air outlet end shell to clamp the outer edge of the guide ring.

6. A perioperative waste fluid collection system with a buffer device according to claim 4, characterized in that: The air inlet end shell and the air outlet end shell are both provided with a conical joint part; the air inlet and the air outlet both penetrate the corresponding conical joint part.

7. A perioperative waste fluid collection system with a buffer device according to claim 2, characterized in that: The buffer plug includes a cylinder wall and a flower-shaped head, wherein the flower-shaped head is located at one end of the cylinder wall and is connected; the cavity 4 is composed of two spaces, one of which is the internal space of the flower-shaped head, and the other is the space formed by the cylinder wall and the guide ring.

8. A perioperative waste fluid collection system with a buffer device according to claim 1, characterized in that: The cross section of the umbrella valve seat is H-shaped, including a cylindrical side wall and a transverse plate, the transverse plate is located in the cylindrical side wall and the central axes of the two coincide; the outer side of the cylindrical side wall is tightly attached to the inner wall of the muffler shell.

9. A perioperative waste fluid collection system with a buffer device according to claim 8, characterized in that: An umbrella valve cover is also provided in the muffler shell; the umbrella valve cover is a cylindrical structure and is located on the back side of the umbrella cover of the umbrella valve; one end of the umbrella valve cover is connected to the umbrella valve seat, and the other end extends along the central axis of the muffler shell and is provided with a muffler hole a at the end.

10. A perioperative waste fluid collection system with a buffer device according to claim 9, characterized in that: An air cylinder structure is provided on the inner end surface of the silencer end cover; an opening for inserting an umbrella valve cover part is provided above the top of the air cylinder structure, and a silencer hole b is provided on the side; the umbrella valve cover part is inserted into the air cylinder structure and is connected with the air cylinder structure through the silencer hole a, and the air cylinder structure is connected with the air outlet channel through the silencer hole b at its top.

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