Anti-reflux device and puncture drainage device

Abstract

The utility model provides an anti-backflow device and a puncture drainage device. The puncture drainage device is provided with an anti-reflux device and comprises a shell, a piston and an anti-reflux film, wherein the piston and the anti-reflux film are arranged in the shell; a liquid discharge channel is reserved on the piston; the anti-reflux film is of a cylindrical structure and comprises a first part and a second part; the first part is hermetically sleeved and fixed with the shell; the second part is sleeved on the outer surface of the piston; the second part can be selectively attached to or separated from the outer surface of the piston; when the second part is separated from the outer surface of the piston, a liquid outlet is formed between the outer surface of the piston and the second part, and the liquid outlet is eliminated when the second part is attached to the outer surface of the piston. According to the utility model, the reverse flow of drainage liquid can be reduced to the greatest extent, the infection risk of a patient is reduced, and the continuous, safe and reliable drainage process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a backflow prevention device and a puncture drainage device. BACKGROUND

[0002] In the clinical practice of neurosurgery, craniopuncture drainage is a crucial treatment method and is widely used in the treatment of various craniocerebral diseases, such as cerebral hemorrhage, hydrocephalus, intracranial infection, etc. This technology can accurately puncture the skull, place a drainage tube into a specific part of the brain, and discharge accumulated liquid (such as blood, cerebrospinal fluid, etc.), so as to reduce intracranial pressure, relieve symptoms, and promote patient recovery. During the craniopuncture drainage process, there is a serious and urgent problem: backflow of drainage liquid. When the patient's body position changes, the drainage system pressure is abnormal, or other factors affect, the liquid in the drainage tube may flow in the opposite direction. This backflow phenomenon may cause a series of serious consequences, the most important of which is infection. Once backflow occurs, bacteria or other pathogens from the outside world may enter the intracranial cavity along with the backflow of the drainage liquid. The intracranial cavity is a relatively sterile and extremely fragile environment, and the invasion of bacteria may cause serious intracranial infections such as meningitis and ventriculitis. These infections not only aggravate the patient's condition, prolong hospitalization time, and increase medical expenses, but also may cause irreversible damage to the patient's nervous system function, and even endanger life. At the same time, if only backflow prevention measures are taken in the drainage bag, it may not effectively drain when needed, and at this time, the blockage of the drainage process may cause the intracranial pressure to rise, which may also cause the same degree of harm. Therefore, an effective drainage device that can effectively prevent backflow is urgently needed to solve the above technical problems.

[0003] It should be noted that the information disclosed in the background section of this application is only intended to deepen the understanding of the general background of the application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a backflow prevention device and a puncture drainage device, which can effectively drain the liquid and minimize the backflow of the drainage liquid, reduce the risk of infection, and provide more reliable protection for the treatment and recovery of patients.

[0005] To achieve the above object, the utility model provides a kind of anti-reflux device, it includes: shell and the piston and anti-reflux membrane being located in the shell;Reserved drainage passage on the piston;The anti-reflux membrane is cylindrical structure, and including first part and second part;The first part is fixed with the shell sealing cover;Second part is wrapped on the outer surface of the piston;Second part can selectively be attached or separated with the outer surface of the piston;When the second part is separated with the outer surface of the piston, the outer surface of the piston and the second part form drainage port between, and the drainage port is eliminated when the second part is attached with the outer surface of the piston.

[0006] Optionally, the piston is hollow structure, and is movably arranged in the shell.

[0007] Optionally, the piston includes coaxially arranged attachment and annular bracket;The annular bracket is arranged at the proximal end bottom of the attachment;Second part is wrapped on the outer surface of the attachment;Annular bracket is movably supported on the inner wall surface of the shell;Multiple drainage passages are reserved between the annular bracket and the inner wall surface of the shell;Multiple drainage passages are distributed along the circumference of the annular bracket.

[0008] Optionally, the outer side of the annular bracket and the inner wall surface of the shell are inversely tapered, and the outer diameter of the annular bracket gradually decreases along the reflux direction, and the inner diameter of the shell gradually increases along the reflux direction.

[0009] Optionally, the attachment is conical structure, and the diameter of the bottom of the attachment is less than or equal to the outer diameter of the annular bracket.

[0010] Optionally, the annular bracket is provided with multiple guide foot supports along the circumference thereof, and multiple guide foot supports are movably supported on the inner wall surface of the shell, each guide foot support has a taper, and one drainage passage is arranged between adjacent two guide foot supports.

[0011] Optionally, the cross-sectional dimension of the second part gradually increases along the direction away from the first part, or the cross-sectional dimension of the second part first gradually decreases along the direction away from the first part, and then gradually increases along the direction away from the first part.

[0012] Optionally, the shell includes shell body and shell cover;The shell cover is installed at the distal end of the shell body;The shell cover is made of hard plastic;The shell body is made of soft plastic.

[0013] Optionally, the outer part of the shell cover is provided with a first mounting joint for connecting a drainage catheter, and the inner part of the shell cover is provided with a hollow shaft, on which a sealingly sleeved fixed connecting pipe is arranged, and the first part is sealingly sleeved fixed on the connecting pipe.

[0014] To achieve the above object, the utility model provides a puncture drainage device which is provided with the anti-reflux device of any one of the utility model.

[0015] Compared with the prior art, the technical scheme provided by the utility model has at least the following beneficial effects:

[0016] The anti-reflux device comprises a shell, a piston and an anti-reflux film arranged in the shell, a drainage channel is reserved on the piston, the anti-reflux film is in a cylindrical structure and comprises a first part and a second part, the first part is sealingly sleeved fixed on the shell, the second part is sleeved on the outer surface of the piston, the second part can be selectively attached to or separated from the outer surface of the piston, when the second part is separated from the outer surface of the piston, a drainage port is formed between the outer surface of the piston and the second part, and the drainage port is eliminated when the second part is attached to the outer surface of the piston.

[0017] The anti-reflux device can quickly open the drainage port between the piston and the anti-reflux film in a forward drainage process by the cooperation of the piston and the anti-reflux film and with the help of drainage liquid, effective drainage is achieved, and when abnormality occurs to cause the backflow of the drainage liquid, the piston and the anti-reflux film can be quickly attached to each other, the drainage port between the piston and the anti-reflux film is closed in time, and the backflow of the drainage liquid is effectively prevented, so that the backflow of the drainage liquid can be maximally reduced while effective drainage is achieved, the risk of infection of a patient is reduced, more reliable protection is provided for the treatment and recovery of the patient, and the drainage process can be maximally ensured to be safe and reliable.

[0018] In particular, when the piston is in a hollow structure and movably arranged in the shell, the anti-reflux device can achieve the effect of opening the drainage port at "zero" pressure, the drainage effect is better, and when backflow occurs, the piston and the anti-reflux film can be quickly attached to each other by the drainage liquid, so that the drainage port is instantaneously closed, the anti-reflux effect is better, and the safety and reliability are better. BRIEF DESCRIPTION OF DRAWINGS

[0019] Those skilled in the art will understand that the drawings provided are used for better understanding of the utility model and do not constitute any limitation on the scope of the utility model.

[0020] Figure 1The cross section structure schematic diagram of the anti-reflux device is provided for the embodiment of the utility model.

[0021] Figure 2 The whole structure perspective schematic diagram of the anti-reflux device is provided for the embodiment of the utility model.

[0022] Figure 3 The structure schematic diagram of the anti-reflux device under another angle is provided for the embodiment of the utility model.

[0023] Figure 4 The structure schematic diagram of the piston is provided for the embodiment of the utility model.

[0024] Figure 5 The structure state of the piston and the anti-reflux film when mutually cooperating is provided for the embodiment of the utility model.

[0025] Figure 6 The use state of the anti-reflux device when opening the drainage port is provided for the embodiment of the utility model, and the diagram arrow A1 indicates the direction of the drainage liquid forward flow.

[0026] Figure 7 The use state of the anti-reflux device when eliminating the drainage port is provided for the embodiment of the utility model, and the diagram arrow A2 indicates the direction of the drainage liquid reverse flow.

[0027] In the figure:

[0028] 1 - shell, 101 - hollow shaft, 102 - shell main body, 103 - shell cover, 2 - piston, 21 - fit part, 22 - annular bracket, 221 - center hole, 23 - guide foot support, 3 - anti-reflux film, 31 - first part, 32 - second part, 4 - first installation joint, 5 - drainage catheter, 6 - drainage catheter, 7 - connecting pipe, 8 - second installation joint, 11 - drainage liquid, 12 - drainage port, 13 - drainage channel. Specific implementation

[0029] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments of the present application, the terms used in the following embodiments are only for the purpose of describing the specific embodiments and are not intended to be limiting on the present application. As used in the specification and the appended claims of the present application, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms “at least one” and “one or more” mean one or two or more (including two), in the following embodiments of the present application. The term “and / or” is used to describe the association relationship of the associated objects, which means that there can be three kinds of relationships; for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects.

[0030] In the present specification, the reference to “one embodiment” or “some embodiments” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Therefore, the phrases “in one embodiment”, “in some embodiments”, “in other some embodiments”, “in yet some embodiments” appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean “one or more but not all embodiments”, unless otherwise specifically emphasized. The terms “include”, “contain”, “have” and their variants mean “including but not limited to”, unless otherwise specifically emphasized. The term “connected” includes direct connection and indirect connection, unless otherwise specified. “First”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0031] In the embodiments of the present application, the words “exemplarily” or “for example” are used to mean as an example, illustration or description. Any embodiment or design scheme described as “exemplarily” or “for example” in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words “exemplarily” or “for example” are used to present the relevant concept in a specific way. In the embodiments of the present application, the proximal end refers to the end close to the pushing and puncturing drainage device when it is in the body (i.e. close to the operation end), and vice versa, the distal end refers to the end away from the puncturing drainage device when it is in the body (i.e. away from the operation end).

[0032] One of the objectives of this invention is to provide an anti-backflow device that, while effectively draining fluid, minimizes the occurrence of backflow, reduces the risk of infection for patients, and provides a more reliable guarantee for their treatment and recovery.

[0033] like Figures 1 to 3 As shown, the anti-backflow device includes: a housing 1, a piston 2, and an anti-backflow membrane 3 disposed within the housing 1. The two ends of the housing 1 along its axial direction are respectively connected to a drainage conduit 5 and a drain conduit 6. Drainage fluid is introduced into the housing 1 through the drainage conduit 5, and simultaneously discharged from the housing 1 through the drain conduit 6. It should be noted that the anti-backflow device provided in this embodiment can itself carry the drainage conduit 5 and the drain conduit 6, or the drainage conduit 5 and the drain conduit 6 can be assembled separately when needed.

[0034] Furthermore, the piston 2 can be any suitable structure, as long as the anti-backflow membrane 3 can surround and cover the piston 2, and the drainage fluid 11 can only pass through the piston 2 through the drainage channel 13 on the piston 2, while a space is reserved between the piston 2 and the inner wall of the housing 1 to store the drainage fluid 11. Specifically, for effective drainage, a drainage channel 13 is reserved on the piston 2, and the drainage channel 13 is directly connected to the space inside the housing 1. Here, the space inside the housing 1 refers to the space inside the housing 1 that is not occupied by the piston 2, the anti-backflow membrane 3, or other internal structures. It should be understood that the drainage fluid 11 can enter both sides of the piston 2 through this drainage channel 13, whether flowing forward (from distal to proximal) or backward (from proximal to distal). However, it should be noted that, except for the drainage channel 13, the drainage fluid 11 is not allowed to pass through other positions on the piston 2, so that when the drainage fluid 11 flows back, it only flows around the piston 2 and the anti-backflow membrane 3. Or, in a preferred case, when backflow occurs, the drainage fluid 11 can also enter the inner cavity of the piston 2, but does not enter the anti-backflow membrane 3 through the piston 2.

[0035] Furthermore, the anti-backflow membrane 3 has a cylindrical structure, comprising a first part 31 and a second part 32. The first part 31 of the anti-backflow membrane 3 is sealed and fixed to the housing 1. Optionally, a connecting pipe 7 is provided inside the distal end of the housing 1, which is sealed and fixed to the hollow shaft 101 inside the housing 1, and then the first part 31 of the anti-backflow membrane 3 is sealed and fixed to the connecting pipe 7. Optionally, the first part 31 of the anti-backflow membrane 3 and the connecting pipe 7 are connected and fixed by bonding, welding or other means. However, in other cases, the connecting pipe 7 can be omitted, and the first part 31 of the anti-backflow membrane 3 can be directly sealed and fixed to the hollow shaft 101. Understandably, the hollow shaft 101 is a hollow cylinder, generally a hollow round cylinder, which connects the anti-backflow membrane 3 and the drainage conduit 5. The hollow shaft 101 is usually integrally formed with the shell cover 103 described below.

[0036] The second part 32 of the anti-backflow membrane 3 is fitted onto the outer surface of the piston 2. The second part 32 of the anti-backflow membrane 3 can selectively adhere to or separate from the outer surface of the piston 2. When the second part 32 of the anti-backflow membrane 3 separates from the outer surface of the piston 2, a drain port 12 is formed between the outer surface of the piston 2 and the second part 32 of the anti-backflow membrane 3 to achieve effective drainage. See details below. Figure 6 Conversely, when the drain port 12 is eliminated when the second part 32 of the anti-backflow membrane 3 is attached to the outer surface of the piston 2, the backflow of the drainage fluid 11 can be prevented. At this time, the drainage fluid 11 cannot flow out of the housing 1 through the housing 1 in reverse. For details, please refer to [link to relevant documentation]. Figure 7 .

[0037] Therefore, the anti-backflow device provided in this embodiment can quickly open the drain port 12 during the forward drainage process by cooperating with the piston 2 and the anti-backflow membrane 3 and with the help of the drainage fluid 11, so as to achieve effective drainage. When an abnormality occurs that causes the drainage fluid 11 to flow back, the piston 2 and the anti-backflow membrane 3 can be quickly controlled to adhere and the drain port 12 can be closed in time to quickly and effectively prevent the drainage fluid 11 from flowing back, thereby minimizing the occurrence of drainage fluid 11 backflow, reducing the risk of patient infection, providing a more reliable guarantee for the patient's treatment and recovery, and ensuring the continuous safety and reliability of the drainage process to the greatest extent.

[0038] To better open the drain port 12 and achieve a better backflow prevention effect, the piston 2 is preferably designed as a hollow structure and is movably disposed within the housing 1. This design allows for near-zero pressure opening of the drain port 12 during normal drainage, resulting in better drainage. Furthermore, in the event of backflow, the piston 22 can be quickly pushed to adhere to the anti-backflow membrane 3, instantly closing the drain port 12, thus improving backflow prevention, safety, and reliability. In this configuration, the piston 2 is made as a hollow structure with a closed distal end and an open proximal end. This ensures that in the event of backflow, the drainage fluid 11 only enters the inner cavity of the piston 2 but does not pass through the piston 2 into the anti-backflow membrane 3.

[0039] For details, please refer to Figure 7 When backflow occurs, some of the drainage fluid 11 flows through the drain channel 13 into the space inside the housing 1 where the piston 2 and the anti-backflow membrane 3 are located, while some of the drainage fluid 11 enters the inner cavity of the piston 2. This allows the drainage fluid 11 to push against the piston 2, causing the piston 2 to quickly adhere to the anti-backflow membrane 3 and close the drain port 12. Simultaneously, the drainage fluid 11 outside the piston 2 and the anti-backflow membrane 3 also applies pressure to the anti-backflow membrane 3, causing it to adhere tightly to the piston 2. This ensures maximum contact area between the piston 2 and the anti-backflow membrane 3 and guarantees a tight fit, which is more effective than the traditional method of relying solely on the self-priming of the backflow membrane to prevent backflow.

[0040] Therefore, another objective of this utility model is to provide a puncture and drainage device that, by incorporating an anti-backflow device, ensures the safety of continuous drainage during the puncture and drainage process, maximizing the safety and reliability of the drainage process, and effectively solving the backflow problem that may occur when the puncture and drainage device needs to be moved due to subjective or objective conditions during continuous drainage.

[0041] It should also be noted that the anti-backflow device provided in this embodiment generally has installation direction requirements. The entire anti-backflow device is best placed vertically according to the direction shown in the diagram to achieve better anti-backflow effect while ensuring normal drainage. It should also be noted that when the anti-backflow device provided in this embodiment is not in use, i.e., in the initial state, the second part 32 of the anti-backflow membrane 3 can be attached to or separated from the outer surface of the piston 2; there are no requirements in this regard. That is, the drain port 12 can be normally open or normally closed. However, to facilitate drainage, in the initial state, the second part 32 of the anti-backflow membrane 3 is separated from the outer surface of the piston 2, i.e., initially forming the drain port 12. Furthermore, in the usage state, under the action of the drainage fluid 11, the drain port 12 can be enlarged.

[0042] Furthermore, the housing 1 is made of a transparent or opaque material. The housing 1 is typically made of medical-grade plastic, such as ABS, PC, PVC, or PE. The housing 1 may include a separately formed housing body 102 and a housing cover 103, with the housing cover 103 mounted at the distal end of the housing body 102.

[0043] Preferably, the shell cap 103 is made of rigid plastic, such as ABS or PC. Preferably, the shell body 102 is made of soft plastic, such as PVC, PE, or other soft plastics known in the art. It should be understood that when the shell body 102 is made of soft plastic, even if blood coagulation causes the anti-backflow membrane 3 to become blocked during drainage, the piston 2 can be moved by squeezing the shell body 102, indirectly clearing the blockage and further ensuring the continuous and reliable puncture drainage process. This operation can generally be performed by a clinician.

[0044] from Figures 1 to 3 As can be seen, a first mounting connector 4 can be provided on the outside of the shell cover 103, which is used to connect the drainage conduit 5. Preferably, the first mounting connector 4 is a Luer connector. Thus, the hollow shaft 101 is disposed inside the shell cover 103, integrally formed with the shell cover 103, and the first mounting connector 4, the hollow shaft 101, and the connecting pipe 7 are arranged coaxially. At the same time, a second mounting connector 8 is provided on the proximal outside of the shell body 102, which is used to connect the drainage conduit 6. Preferably, the second mounting connector 8 is a Luer connector.

[0045] It should be understood that all Luer connectors described herein are standard parts. Thus, through the first mounting connector 4 and the second mounting connector 8, the anti-backflow device of this embodiment can be connected and used with most puncture and drainage devices, without being limited by installation conditions. In summary, the anti-backflow device provided by this utility model can be quickly and effectively installed on most puncture and drainage devices.

[0046] Furthermore, regarding the anti-backflow membrane 3, it primarily employs an elastic soft membrane. This elastic soft membrane is relatively soft, easily dispersed by the drainage fluid 11, and readily adheres to the outer surface of the piston 2. The anti-backflow membrane 3 can be made of various medical-grade membrane materials; this application does not limit its application in this regard. The anti-backflow membrane 3 can be manufactured into various cylindrical structures, such as circular or non-circular cylindrical structures.

[0047] To achieve better traffic generation, such as Figure 5 As shown, preferably, the cross-sectional dimensions (such as diameter or area) of the second part 32 of the anti-backflow membrane 3 first gradually decrease along the direction away from the first part 31, and then gradually increase along the direction away from the first part 31, that is, forming a tapering shape that gradually decreases from both ends to the middle. This configuration makes it easier for the second part 32 of the anti-backflow membrane 3 to be opened by the drainage fluid 11 during forward drainage, and also allows the second part 32 of the anti-backflow membrane 3 to adhere to the piston 2 over a larger area.

[0048] In another embodiment, the cross-sectional dimensions of the second portion 32 of the anti-backflow membrane 3 can gradually increase in the direction away from the first portion 31, forming a unidirectional flared shape. Similarly, the anti-backflow membrane 3 can be easily opened by the drainage liquid 11.

[0049] The structure of piston 2 will be further explained next.

[0050] As mentioned above, the piston 2 is preferably movably disposed within the housing 1. In this case, the piston 2 can move from the proximal end to the distal end under the push of the drainage fluid 11, allowing it to quickly and tightly adhere to the anti-backflow membrane 3. After adhesion, if it is necessary to reset the piston 2 and the anti-backflow membrane 3, preferably, when using a soft shell body 102, the piston 2 can be moved from the distal end to the proximal end from the adhered position by squeezing the shell body 102 until the piston 2 is limited by the housing 1 and no longer moves. It should also be understood that if the housing 1 becomes blocked due to blood coagulation, the blockage can also be eliminated by squeezing the shell body 102, ensuring the continuous safety and reliability of the drainage process.

[0051] like Figures 1 to 4As shown, in a preferred embodiment, the piston 2 includes a coaxially arranged fitting portion 21 and an annular bracket 22; the annular bracket 22 is disposed at the proximal bottom of the fitting portion 21; the second portion 32 of the anti-backflow membrane 3 is at least partially fitted onto the outer surface of the fitting portion 21; wherein the annular bracket 22 is movably supported on the inner wall surface of the housing 1. Because the annular bracket 22 has a certain degree of elasticity, it can be stably supported on the inner wall surface of the housing 1 through its own deformation, and its structure is simple and convenient to install and use.

[0052] Preferably, a plurality of drainage channels 13 are reserved between the annular bracket 22 and the inner wall surface of the housing 1. The plurality of drainage channels 13 are distributed at intervals along the circumference of the annular bracket 22, preferably evenly distributed, for better drainage effect. It is understood that there are at least two drainage channels 13, such as two, three or more. In this embodiment, there are four drainage channels 13, but it is not limited to this in practice.

[0053] Furthermore, the outer surface of the annular bracket 22 and the inner wall of the housing 1 are preferably arranged with opposite tapers. Specifically, the outer diameter of the annular bracket 22 gradually decreases along the counter-flow direction, while the inner diameter of the housing 1 gradually increases along the counter-flow direction. This greatly reduces the resistance to piston 2 movement. Preferably, the taper is 20° to 160°.

[0054] Continue to refer to Figures 1 to 4 In a preferred embodiment, the annular bracket 22 is provided with multiple guide feet 23 along its circumference. These guide feet 23 are movably supported on the inner wall of the housing 1, and each guide foot 23 has a taper. A drainage channel 13 is provided between any two adjacent guide feet 23. The guide feet 23 are cantilevered. When multiple guide feet 23 are provided, the piston 2 can be stably supported within the housing 1, ensuring the stability of the piston 2 when moving within the housing 1, especially under high drainage pressure, providing stable support for the piston 2. In practice, there are at least three guide feet 23; for example, optionally, there are four. The guide feet 23 can be straight or curved; more suitable is an arc shape for smoother sliding.

[0055] Furthermore, the fitting portion 21 has a hollow structure, with its distal top closed and its proximal bottom fitted with an annular bracket 22. The bottom diameter of the fitting portion 21 should be less than or equal to the outer diameter of the annular bracket 22, or in other words, the diameter of the central hole 221 of the annular bracket 22 should be less than or equal to the bottom diameter of the fitting portion 21. Specifically, the fitting portion 21 is not outside the envelope of the annular bracket 22 around its own central axis, thus leaving space between the fitting portion 21 and the inner wall of the housing 1 (i.e., the space inside the housing 1), such as... Figure 7As shown, when backflow occurs, the space inside the outer shell of the bonding part 21 can accommodate the drainage liquid 11, and the outer drainage liquid 11 presses against the anti-backflow membrane 3 to achieve bonding.

[0056] Preferably, the bonding portion 21 has a conical structure; more suitablely, it has a cylindrical structure. In the preferred embodiment provided in this application, the bonding portion 21 has a cylindrical structure, and the second part 32 of the anti-backflow membrane 3 adopts a constricted shape with the middle portion tapering inward relative to both ends, as detailed in [see details]. Figure 5 .

[0057] In summary, the technical solution provided by this utility model has at least the following beneficial effects:

[0058] During positive drainage, the drainage fluid 11 helps to quickly open the drain port 12, effectively draining the fluid and preventing blockages. Simultaneously, in the event of an abnormality causing backflow of the drainage fluid 11, the piston 2 and anti-backflow membrane 3 can be quickly controlled to adhere, promptly closing the drain port 12 and effectively preventing backflow. This is more effective than traditional methods that rely solely on the self-priming of the anti-backflow membrane. Therefore, it minimizes the occurrence of drainage fluid backflow, reduces the risk of infection for patients, provides more reliable protection for their treatment and recovery, and ensures the continuous safety and reliability of the drainage process.

[0059] In particular, when piston 2 has a hollow structure and is movably installed within housing 1, it can achieve the effect of opening drain port 12 with "zero" pressure, resulting in better drainage. Furthermore, in the event of backflow, the drainage fluid 11 can quickly push piston 2 away from the anti-backflow membrane 3, instantly closing drain port 12, further enhancing the anti-backflow effect and improving safety and reliability. Additionally, when the fitting part 21 in piston 2 adopts a conical structure, it allows for better fitting between piston 2 and anti-backflow membrane 3. Simultaneously, during backflow, the piston 2 experiences uniform force in all directions, generating better positive pressure on anti-backflow membrane 3, ensuring a tighter fit and improved anti-backflow effect. When housing body 102 is made of soft plastic, even if blood coagulation causes anti-backflow membrane 3 to become blocked during puncture drainage, squeezing housing body 102 can move piston 2, indirectly clearing the blockage and ensuring continuous, safe, and reliable drainage. When the second part 32 of the anti-backflow membrane 3 adopts a tapered design, the anti-backflow membrane 3 can be easily flushed open by the drainage fluid during forward drainage, so as to achieve better drainage.

[0060] Finally, it should be noted that although the innovation of this application originates from the field of intracranial puncture and drainage technology, those skilled in the art will understand that this application can also be applied to puncture and drainage techniques in other fields, such as urology and abdominal cavity. Particularly preferably, the anti-backflow device provided by this utility model is used during intracranial puncture and drainage, enabling the cranial puncture and drainage technique to play a more active role in clinical applications.

[0061] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of this utility model, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features of the embodiments of this utility model can be arbitrarily combined with each other.

Claims

1. A backflow prevention device, characterized in that, include: The housing, and the piston and anti-backflow membrane disposed within the housing; The piston has a pre-reserved drainage channel; The anti-backflow membrane has a cylindrical structure and includes a first part and a second part; the first part is fixed to the housing in a sealing sleeve; the second part is sleeved on the outer surface of the piston; the second part can selectively adhere to or separate from the outer surface of the piston; when the second part separates from the outer surface of the piston, a drain port is formed between the outer surface of the piston and the second part, and the drain port is eliminated when the second part adheres to the outer surface of the piston.

2. The anti-backflow device according to claim 1, characterized in that, The piston has a hollow structure and is movably disposed within the housing.

3. The anti-backflow device according to claim 2, characterized in that, The piston includes a coaxially arranged fitting portion and an annular bracket; the annular bracket is disposed at the proximal bottom of the fitting portion; the second portion is fitted onto the outer surface of the fitting portion. The annular bracket is movably supported on the inner wall of the housing; multiple drainage channels are reserved between the annular bracket and the inner wall of the housing; The multiple drainage channels are distributed at intervals along the circumference of the annular bracket.

4. The anti-backflow device according to claim 3, characterized in that, The outer surface of the annular bracket and the inner wall of the housing are set with opposite tapers, and the outer diameter of the annular bracket gradually decreases along the counter-current direction, while the inner diameter of the housing gradually increases along the counter-current direction.

5. The anti-backflow device according to claim 3, characterized in that, The fitting part has a conical structure, and the bottom diameter of the fitting part is less than or equal to the outer diameter of the annular bracket.

6. The anti-backflow device according to claim 3, characterized in that, The annular bracket is provided with multiple guide feet along its circumference. The multiple guide feet are movably supported on the inner wall of the housing. Each guide foot has a taper, and a drainage channel is provided between two adjacent guide feet.

7. The anti-backflow device according to claim 1, characterized in that, The cross-sectional dimension of the second part gradually increases in the direction away from the first part, or the cross-sectional dimension of the second part first gradually decreases in the direction away from the first part, and then gradually increases in the direction away from the first part.

8. The anti-backflow device according to claim 1, characterized in that, The housing includes a main body and a cover; the cover is installed at the distal end of the main body; the cover is made of rigid plastic; the main body is made of soft plastic.

9. The anti-backflow device according to claim 8, characterized in that, The outer side of the shell cover is provided with a first mounting joint for connecting a drainage conduit. The inner side of the shell cover is provided with a hollow shaft, and a connecting pipe is fixed on the hollow shaft with a sealing sleeve. The first part of the sealing sleeve is fixed on the connecting pipe. The outer side of the proximal end of the shell body is provided with a second mounting joint for connecting a drainage conduit.

10. A puncture and drainage device, characterized in that, It is equipped with an anti-backflow device as described in any one of claims 1-9.

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