Anti-blocking drainage device with anticoagulation and negative pressure monitoring and alarming functions

Abstract

The application discloses an anti-blocking drainage device with anticoagulation and negative pressure monitoring and alarm functions, and relates to the technical field of medical drainage devices.The anti-blocking drainage device comprises a front-end drainage assembly, a negative pressure ball cavity and a tail liquid discharge assembly, the tail liquid discharge assembly is fixedly connected with a trumpet-shaped widened interface at the tail end of the front-end drainage assembly, a central drainage main pipe is fixedly connected inside the negative pressure ball cavity, the inlet end of the central drainage main pipe is in communication with the trumpet-shaped widened interface, and an annular heparin slow-release capsule is coaxially arranged on the outer wall of the central drainage main pipe.The smooth transition design of the flow channel of the trumpet-shaped widened interface eliminates the pipe diameter mutation and step structure at the traditional interface, the annular heparin slow-release capsule slowly and uniformly releases heparin into the cavity by relying on the semi-permeable characteristics of the permeated silica gel, thereby directly inhibiting the generation of blood clots in the cavity, the embedded micro pressure sensor is used for monitoring the negative pressure state in the cavity in real time, and the pressure value and change rate dual-dimension judgment logic is adopted, so that the audible and light alarms can be triggered immediately in the early stage of pipeline blockage.

Description

Technical Field

[0001] This invention relates to the field of medical drainage device technology, specifically an anti-blockage drainage device with anticoagulation and negative pressure monitoring and alarm functions. Background Technology

[0002] Drainage devices, as a key auxiliary tool in modern surgery, are widely used in various surgical procedures and wound / surgical management. Their purpose is to promptly and effectively drain accumulated blood and potentially bacterial-prone fluid from the surgical area, thereby preventing infection, ensuring the effectiveness of surgical treatment, and promoting postoperative recovery. Negative pressure drainage devices rely on the elastic deformation of a negative pressure bulb to create a negative pressure environment within the cavity. Driven by pressure difference, they continuously drain bloody exudate, necrotic tissue debris, and inflammatory secretions from the body cavity / wound. This effectively reduces fluid accumulation and hematoma formation in the wound, shortens the time patients need in-drainage after surgery, and lowers the risk of local infection. It is a crucial supporting technology in postoperative rapid recovery systems.

[0003] Currently, widely used disposable negative pressure drainage devices in clinical practice mainly consist of a front-end drainage tube, a pluggable connector, an ellipsoidal elastic negative pressure bulb cavity, and an independent drainage channel with a threaded sealing cap at the rear. Relying on the negative pressure difference within the cavity created by the rebound of the negative pressure bulb under pressure, they continuously drain bloody exudate, necrotic tissue debris, and inflammatory secretions from the wound. They are a routine basic instrument for postoperative wound care. However, the structural design of this type of device has several inherent defects: abrupt changes in tube diameter and right-angle steps exist at the connection between the drainage tube and the negative pressure bulb cavity, leading to local flow obstruction. The sudden increase in pressure makes it easy for fibrin flocs, small blood clots, and tissue debris in the drainage fluid to become stuck and accumulate at this point, making it the most common site for tube blockage. The device itself lacks a local anticoagulation structure, allowing bloody drainage fluid to coagulate naturally within the cavity and tubing. Furthermore, the lack of a real-time monitoring mechanism for abnormalities means that issues such as tubing blockage, loose connections causing leaks, and decreased negative pressure can only be assessed by frequent visual inspections by medical staff, resulting in significant delays in detection and increasing the risk of complications such as wound effusion, hematoma, and infection. In particular, hematoma compression after spinal surgery can lead to serious consequences such as nerve damage and paraplegia. Therefore, optimizing negative pressure drainage devices is urgently needed. Those skilled in the art have provided anti-blockage drainage devices with anticoagulation and negative pressure monitoring alarm functions to address the problems mentioned in the background section. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A clogging drainage device with anticoagulation and negative pressure monitoring and alarm functions includes a front-end drainage component, a negative pressure ball cavity, and a tail-end drainage component. The front-end drainage component has a flared, widened interface fixedly connected to its end. The diameter of the flared, widened interface gradually increases along the drainage direction. A central drainage main pipe is fixedly connected inside the negative pressure ball cavity. The inlet end of the central drainage main pipe communicates with the flared, widened interface. An annular heparin sustained-release capsule is coaxially sleeved on the outer wall of the central drainage main pipe and is suspended inside the negative pressure ball cavity. A miniature pressure sensor is embedded in the side wall of the negative pressure ball cavity, with the sensing surface of the miniature pressure sensor facing the inside of the cavity. The outer surface of the miniature pressure sensor on the side away from the negative pressure ball cavity is flush with the inner wall of the negative pressure ball cavity. One end of the tail-end drainage component is fixedly connected to the side of the negative pressure ball cavity away from the front-end drainage component, and the tail-end drainage component communicates with the negative pressure ball cavity.

[0006] As a further aspect of the present invention: the end diameter of the horn-shaped widened interface is increased by 2mm compared with the inlet diameter, and the inner wall of the flow channel of the horn-shaped widened interface has no steps and no right-angle turns.

[0007] As a further aspect of the present invention: the annular heparin sustained-release capsule is a sealed annular capsule made of permeable medical silicone material, the annular heparin sustained-release capsule is filled with a heparin sustained-release matrix, and the overall outer diameter of the annular heparin sustained-release capsule is at most 1 / 3 of the maximum inner diameter of the negative pressure ball cavity.

[0008] As a further aspect of the present invention: a spiral locking connector is provided between the horn-shaped widened interface and the negative pressure ball cavity, and a duckbill-type one-way valve is coaxially embedded inside the spiral locking connector.

[0009] As a further aspect of the present invention: the conduction direction of the duckbill-type one-way valve is from the front end drainage component toward the inside of the negative pressure ball cavity, and the duckbill-type one-way valve is used to prevent the drainage fluid from flowing back.

[0010] As a further embodiment of the present invention: a signal transmission wire is pre-embedded inside the tube wall of the negative pressure ball cavity, and the signal transmission wire is led out from the tail drain assembly.

[0011] As a further embodiment of the present invention: the tail drain assembly includes a tail drain channel and a threaded sealing cap. The tail drain channel is directly connected to the inside of the negative pressure ball cavity. The tail drain channel and the central drainage main are independent passages. The threaded sealing cap is threadedly connected to the end of the tail drain channel away from the negative pressure ball cavity. One end of the signal transmission wire is led out from the side of the threaded sealing cap away from the tail drain channel.

[0012] As a further embodiment of the present invention: a limiting ring is fixedly connected to the outer wall of the tail drain channel, and the limiting ring is an annular protrusion integrally formed with the tail drain channel.

[0013] Compared with the prior art, the beneficial effects of the present invention are: Compared with existing traditional negative pressure drainage devices, this invention eliminates abrupt changes in pipe diameter and step structures at traditional interfaces through a smooth transition design of a widened, trumpet-shaped interface. This significantly reduces the flow resistance of the drainage fluid, minimizes the accumulation of blood clots and tissue debris, and reduces physical blockage from the structural source. A ring-shaped heparin-releasing capsule, coaxially fitted onto the outer wall of the central drainage main pipe, slowly and uniformly releases heparin into the drainage fluid within the cavity, relying on the semi-permeable properties of the silicone. This directly inhibits the formation of blood clots within the cavity. Furthermore, the heparin only acts within the device and does not enter the patient's systemic circulation, thus having no impact on systemic coagulation function. Combined with an embedded micro-pressure sensor that monitors the negative pressure state within the cavity in real time, and employing a dual-dimensional judgment logic based on pressure value and rate of change, it can immediately trigger audible and visual alarms in the early stages of pipe blockage or when the interface becomes loose and leaks air. This shifts the intervention time from post-treatment to early warning, effectively reducing complications such as wound fluid accumulation and infection. This invention is easy to promote and implement, and neither the sensor nor the anticoagulant structure obstructs the drainage channel or increases the risk of new blockages. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions; Figure 2 A schematic diagram of the internal structure of the negative pressure ball cavity in an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions; Figure 3 A sectional view of one side of the negative pressure ball cavity in an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions; Figure 4 A sectional view of one side of the horn-shaped widened interface in an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions; Figure 5 This is a structural breakdown diagram of the front-end drainage component in an anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions.

[0015] In the diagram: 1. Front drainage assembly; 2. Negative pressure ball cavity; 3. Tail drainage assembly; 31. Tail drainage channel; 32. Threaded sealing cap; 4. Horn-shaped widened interface; 5. Central drainage main pipe; 6. Annular heparin sustained-release capsule; 7. Miniature pressure sensor; 8. Heparin sustained-release matrix; 9. Spiral locking connector; 10. Duckbill type check valve; 11. Signal transmission wire; 12. Limiting ring. Detailed Implementation

[0016] Please see Figures 1-5In this embodiment of the invention, the anti-clogging drainage device with anticoagulation and negative pressure monitoring and alarm functions includes a front-end drainage component 1, a negative pressure ball cavity 2, and a tail-end drainage component 3. The end of the front-end drainage component 1 is fixedly connected to a flared, widened interface 4, the diameter of which smoothly increases along the drainage direction. A central drainage main pipe 5 is fixedly connected inside the negative pressure ball cavity 2, the inlet end of which communicates with the flared, widened interface 4. An annular heparin sustained-release capsule 6 is coaxially sleeved on the outer wall of the central drainage main pipe 5, and the annular heparin sustained-release capsule 6 is suspended in the negative pressure ball cavity 2. Inside, a miniature pressure sensor 7 is embedded in the side wall of the negative pressure ball cavity 2. The sensing surface of the miniature pressure sensor 7 faces the inside of the cavity, and the outer surface of the side of the miniature pressure sensor 7 away from the negative pressure ball cavity 2 is flush with the inner wall of the negative pressure ball cavity 2. One end of the tail drain assembly 3 is fixedly connected to the side of the negative pressure ball cavity 2 away from the front end drainage assembly 1, and the tail drain assembly 3 is connected to the negative pressure ball cavity 2. The end diameter of the horn-shaped widened interface 4 is 2mm larger than the inlet diameter, and the inner wall of the flow channel of the horn-shaped widened interface 4 has no steps and no right angle turns.

[0017] It should be noted that in the above-mentioned device, the front-end drainage component 1 and the flared widened interface 4 are integrally injection molded. The nominal outer diameter of the front-end drainage component 1 is 5mm, which is suitable for routine clinical drainage tubing. The diameter of the flared widened interface 4 increases smoothly and uniformly along the drainage direction, and the diameter at the end is 2mm larger than that at the inlet end. The inner wall of the flow channel is smooth throughout without steps or right-angle bends, eliminating the jamming points of traditional interfaces. Through the smooth transition design of the flow channel of the flared widened interface 4, the abrupt change in diameter and the step structure at the traditional interface are eliminated, which greatly reduces the flow resistance of the drainage fluid and reduces the accumulation of blood clots and tissue debris. This reduces the occurrence of physical blockage from the structural source. Relying on the annular heparin sustained-release capsule 6 coaxially sleeved on the outer wall of the central drainage main tube 5, heparin is slowly and uniformly released into the drainage fluid in the cavity by relying on the semi-permeable properties of the silicone, which directly inhibits the formation of blood clots in the cavity. Moreover, heparin only... Acting within the device and not entering the patient's systemic circulation, it does not affect systemic coagulation function at all, avoiding the bleeding risk of systemic anticoagulation. In conjunction with the embedded miniature pressure sensor 7, it monitors the negative pressure status within the cavity in real time. Using a dual-dimensional judgment logic of pressure value and rate of change, it can immediately trigger an audible and visual alarm in the early stage of pipeline blockage or when the interface is loose and leaking air, shifting the intervention time from post-treatment to early warning, effectively reducing complications such as wound fluid accumulation and infection. This invention is easy to promote and implement, and neither the sensor nor the anticoagulation structure encroaches on the drainage channel or increases the risk of new blockage. The aforementioned miniature pressure sensor 7 is a thin-film piezoresistive pressure sensor, which is completely embedded inside the wall of the negative pressure ball cavity 2, with the sensing surface facing the inside of the negative pressure ball cavity 2 and flush with the inner wall of the negative pressure ball cavity 2, without any protrusions or edges, making it difficult for blood clots and tissue debris to adhere, and it will not become a new cause of blockage itself.

[0018] The annular heparin sustained-release capsule 6 is a sealed annular capsule made of permeable medical silicone material. The annular heparin sustained-release capsule 6 is filled with heparin sustained-release matrix 8. The maximum outer diameter of the annular heparin sustained-release capsule 6 is 1 / 3 of the maximum inner diameter of the negative pressure ball cavity 2.

[0019] It should be noted that in the above-mentioned device, the annular heparin sustained-release capsule 6 is a sealed annular structure made of permeable medical silicone material, filled with heparin sustained-release matrix 8. The inner diameter of the annular heparin sustained-release capsule 6 is 2 mm larger than the outer diameter of the central drainage tube 5, and the overall outer diameter does not exceed 1 / 3 of the maximum inner diameter of the negative pressure ball cavity 2, so that the capsule is completely suspended inside the cavity. A uniform annular flow gap is formed between the outer wall of the annular heparin sustained-release capsule 6 and the inner wall of the negative pressure ball cavity 2, which does not hinder the flow of drainage fluid at all, and will not fail to adhere to the wall due to the compression of the negative pressure ball cavity 2. During the drainage process, the capsule is completely immersed in the drainage fluid, and heparin molecules slowly permeate and diffuse through the silicone wall, forming a stable local anticoagulant environment in the cavity. Based on the semi-permeable membrane properties of medical-grade permeable silicone rubber and the passive diffusion process driven by the cross-wall concentration gradient, the medical-grade permeable silicone rubber, after curing, forms a three-dimensional cross-linked polymer network. Nanoscale free volume gaps exist between the molecular chains, allowing precise control of the equivalent pore size by adjusting the degree of cross-linking. This allows heparin sustained-release matrix 8 molecules to diffuse through these polymer gaps, while the large-molecule sustained-release matrix within the ring-shaped heparin sustained-release capsule 6 cannot permeate, preventing leakage of contents. The high-drug-load heparin sustained-release matrix 8 initially fills the ring-shaped heparin sustained-release capsule 6 at a concentration much higher than the external drainage fluid. Substances spontaneously migrate from high-concentration areas to low-concentration areas. Furthermore, during clinical drainage, the external drainage fluid is continuously renewed, and released heparin is constantly diluted and carried away, maintaining a long-term stable cross-wall concentration gradient and driving the continuous outward permeation of the heparin sustained-release matrix 8. Simultaneously, the solution forms a dual controlled-release barrier through the thickness and degree of cross-linking of the silicone wall and the internal hydrophilic gel sustained-release framework, precisely controlling the release rate. This avoids sudden drug release in the initial stage of use and maintains a stable heparin concentration within the capsule cavity at 0.1~0.5% over a long period. With an effective anticoagulation range of IU / mL, no additional power assistance is required throughout the process, and the drug only acts locally on the device and does not enter the patient's systemic circulation, resulting in excellent safety and controllability.

[0020] A spiral locking connector 9 is provided between the horn-shaped widened interface 4 and the negative pressure ball cavity 2. A duckbill-type one-way valve 10 is coaxially embedded inside the spiral locking connector 9. The duckbill-type one-way valve 10 is directed from the front end drainage component 1 toward the inside of the negative pressure ball cavity 2. The duckbill-type one-way valve 10 is used to prevent the drainage fluid from flowing back. A signal transmission wire 11 is pre-embedded inside the tube wall of the negative pressure ball cavity 2. The signal transmission wire 11 is led out from the tail end drainage component 3.

[0021] It should be noted that in the above-mentioned device, the spiral locking connector 9 adopts a split threaded fit structure, consisting of an external threaded fixing seat integrally formed with the inlet of the negative pressure ball cavity 2, an internal threaded locking nut matching the end of the flared widened interface 4, and a medical silicone sealing washer clamped on the mating end face. The outer wall of the nut is provided with axial knurling texture to improve the anti-slip performance when operating with gloves, replacing the plug-in interference fit interface of the traditional negative pressure drainage device, and can withstand greater pipeline pulling force without loosening. The internally embedded duckbill-type one-way valve 10 is integrally formed with medical elastic silicone. It relies on the positive pressure difference to push the elastic lip to open to realize the forward flow of drainage fluid. When pressure is applied in the reverse direction, the lip closes tightly to completely block the flow channel. To prevent drainage fluid and air from flowing back towards the wound and avoid the risk of retrograde infection, the signal transmission wire 11, which is embedded inside the tube wall, is fixed by an integrated injection molding sealing process and is not exposed inside the cavity at all. One end of the signal transmission wire 11 is electrically connected to the miniature pressure sensor 7. It will not attract tissue debris or fibrin flocs that may cause blockage, nor will it compromise the airtightness of the cavity. It can stably maintain a negative pressure environment inside the cavity. The signal transmission wire 11 can also transmit the signal received by the miniature pressure sensor 7 to an external alarm device. This alarm device is preset with a normal pressure threshold and a rate of change threshold. It can identify various abnormal states such as complete blockage, partial blockage, negative pressure leakage, and cavity fullness, and trigger corresponding audible and visual prompts.

[0022] The tail drain assembly 3 includes a tail drain channel 31 and a threaded sealing cap 32. The tail drain channel 31 is directly connected to the inside of the negative pressure ball cavity 2. The tail drain channel 31 and the central drainage main pipe 5 are independent passages. The threaded sealing cap 32 is threaded to the end of the tail drain channel 31 away from the negative pressure ball cavity 2. One end of the signal transmission wire 11 is led out from the side of the threaded sealing cap 32 away from the tail drain channel 31. A limiting ring 12 is fixedly connected to the outer wall of the tail drain channel 31. The limiting ring 12 is an annular protrusion integrally formed with the tail drain channel 31.

[0023] It should be noted that in the above-mentioned device, the tail drainage channel 31 adopts an independent flow channel design that is completely separated from the central drainage main pipe 5. It opens directly at the lowest point of the tail of the negative pressure ball cavity 2. During drainage, the drainage fluid can be directly discharged from the negative pressure ball cavity 2 through the wide-diameter tail drainage channel 31. The flow channel has no bends or narrowings and is not easily blocked by tissue debris and blood clots. Combined with the positive pressure generated by squeezing the ball, it can quickly flush out the deposits in the cavity and has a self-cleaning effect. The threaded sealing cap 32 and the drainage channel are fitted with fine-pitch threads. When tightened, the rear end face is reliably sealed, which can maintain the stable negative pressure of the cavity for a long time. The signal transmission wire 11 is led out from the center of the sealing cover using a sealant potting process, which takes into account both signal transmission and cavity airtightness. The integrally formed limiting ring 12 serves as an axial positioning reference for the assembly of the tail tube and the cavity, ensuring consistent assembly depth and stable sealing performance. On the other hand, it provides a finger support point for exhaust and drainage operations, preventing the tube from slipping or the ball from being excessively squeezed and bent during operation, thus improving the convenience and stability of clinical operation.

[0024] The working principle of this invention is: In use, first unscrew the threaded sealing cap 32 at the tail end, and evenly squeeze the negative pressure ball cavity 2 to expel the internal air. During the squeezing process, the duckbill-type one-way valve 10 inside the spiral locking connector 9 automatically closes under the reverse pressure inside the cavity, preventing air from flowing back towards the front drainage component 1. All the air inside the negative pressure ball cavity is discharged to the external environment through the independent tail drainage channel 31. After the air is expelled, tighten the threaded sealing cap 32 to maintain the cavity in a sealed state. After releasing the squeezed negative pressure ball cavity 2, the negative pressure ball cavity 2 relies on its own elastic rebound to form a stable negative pressure inside the cavity. At this time, the duckbill-type one-way valve 10 opens under the action of positive pressure difference, and the bloody exudate, necrotic tissue debris, and inflammatory secretions at the wound are suctioned under the action of negative pressure. After passing smoothly through the front-end drainage component 1 and the horn-shaped widened interface 4, the fluid enters the central drainage main tube 5 inside the negative pressure ball cavity 2 via the duckbill-type one-way valve 10. Finally, it flows out from the end of the central drainage main tube 5 and is stored within the negative pressure ball cavity 2. As the fluid level in the cavity gradually rises, the annular heparin sustained-release capsule 6, coaxially sleeved on the outer wall of the central drainage main tube 5, is completely immersed in the drainage fluid. The high-drug-load heparin sustained-release matrix 8 within the annular heparin sustained-release capsule 6 diffuses slowly and uniformly outward through the three-dimensional cross-linked polymer network gaps of the permeable medical silicone wall, relying on the trans-wall concentration difference. Combined with the dual controlled-release barrier formed by the silicone wall parameters and the internal hydrophilic gel skeleton, the heparin concentration in the cavity is stably maintained at 0.1~0.5 IU / mL for a long period. The effective anticoagulant zone continuously inhibits blood clot formation to reduce the risk of coagulation-related blockages. Simultaneously, a miniature pressure sensor 7 embedded in the sidewall of the cavity collects intracavitary pressure data in real time, transmitting it to an external alarm module via a pre-embedded signal transmission wire 11. The module uses a dual-dimensional logic of pressure value and pressure change rate to determine the drainage status. When abnormal conditions such as tube blockage, pressure kinking, loose or leaking interfaces, or negative pressure attenuation occur, an audible and visual alarm is immediately triggered, advancing the intervention to the early stage of blockage. When drainage is required, first... Clamp the front drainage tube with a tubing clamp to block the passage between the wound and the cavity. After unscrewing the threaded sealing cap 32, squeeze the negative pressure ball cavity 2 evenly again. The drainage fluid stored in the negative pressure ball cavity 2 is discharged directly from the body through the tail drainage channel 31. During this process, the duckbill-type one-way valve 10 remains closed under the action of reverse pressure, which completely avoids the drainage fluid flowing back to the wound and causing retrograde infection. After the drainage is completed, tighten the threaded sealing cap 32 and loosen the negative pressure ball cavity 2 to make the cavity re-form negative pressure. Open the front tubing clamp to restore the normal drainage state.

[0025] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drainage device with anticoagulation and negative pressure monitoring and alarm functions, comprising a front-end drainage component (1), a negative pressure ball cavity (2), and a tail-end drainage component (3), characterized in that, The end of the front-end drainage component (1) is fixedly connected to a horn-shaped widened interface (4). The diameter of the horn-shaped widened interface (4) gradually increases along the drainage direction. A central drainage main pipe (5) is fixedly connected inside the negative pressure ball cavity (2). The inlet end of the central drainage main pipe (5) is connected to the horn-shaped widened interface (4). An annular heparin sustained-release capsule (6) is coaxially sleeved on the outer wall of the central drainage main pipe (5). The annular heparin sustained-release capsule (6) is suspended inside the negative pressure ball cavity (2). A miniature pressure sensor (7) is embedded in the side wall of the negative pressure ball cavity (2). The sensing surface of the miniature pressure sensor (7) faces the inside of the cavity, and the outer surface of the miniature pressure sensor (7) away from the negative pressure ball cavity (2) is flush with the inner wall of the negative pressure ball cavity (2). One end of the tail drain assembly (3) is fixedly connected to the side of the negative pressure ball cavity (2) away from the front drain assembly (1), and the tail drain assembly (3) is connected to the negative pressure ball cavity (2). This seems unclear and difficult to understand.

2. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 1, characterized in that, The end diameter of the horn-shaped widened interface (4) is 2 mm larger than the inlet diameter, and the inner wall of the flow channel of the horn-shaped widened interface (4) has no steps and no right-angle turns.

3. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 2, characterized in that, The annular heparin sustained-release capsule (6) is a sealed annular capsule made of permeable medical silicone material. The annular heparin sustained-release capsule (6) is filled with heparin sustained-release matrix (8). The overall outer diameter of the annular heparin sustained-release capsule (6) is up to 1 / 3 of the maximum inner diameter of the negative pressure ball cavity (2).

4. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 3, characterized in that, A spiral locking connector (9) is provided between the horn-shaped widened interface (4) and the negative pressure ball cavity (2), and a duckbill-type one-way valve (10) is coaxially embedded inside the spiral locking connector (9).

5. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 4, characterized in that, The duckbill-type one-way valve (10) is directed from the front end drainage assembly (1) toward the inside of the negative pressure ball cavity (2), and the duckbill-type one-way valve (10) is used to prevent the drainage fluid from flowing back.

6. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 5, characterized in that, The negative pressure ball cavity (2) has a signal transmission wire (11) pre-embedded inside the tube wall, and the signal transmission wire (11) is led out from the tail drain assembly (3).

7. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 6, characterized in that, The tail drain assembly (3) includes a tail drain channel (31) and a threaded sealing cap (32). The tail drain channel (31) is directly connected to the inside of the negative pressure ball cavity (2). The tail drain channel (31) and the central drainage main pipe (5) are independent passages. The threaded sealing cap (32) is threaded to the end of the tail drain channel (31) away from the negative pressure ball cavity (2). One end of the signal transmission wire (11) is led out from the side of the threaded sealing cap (32) away from the tail drain channel (31).

8. The anti-clogging drainage device with anti-coagulation and negative pressure monitoring and alarm functions according to claim 7, characterized in that, The outer wall of the tail drain channel (31) is fixedly connected to a limiting ring (12), which is an annular protrusion integrally formed with the tail drain channel (31).

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