Anti-reflux multichannel puncture drainage needle

Abstract

The invention relates to an anti-backflow multichannel puncture drainage needle which comprises a needle body, a main drainage channel, a flushing channel, a medicine perfusion channel and an anti-backflow assembly. The main drainage channel is coaxially arranged in the needle body, extends in the length direction of the needle body and is used for sucking tissue fluid at a pathological part; the flushing channel and the medicine perfusion channel are arranged in the main drainage channel and extend in the length direction of the main drainage channel; the flushing channel is used for conveying cleaning fluid to flush and clean pathological parts; the medicine filling channel is used for conveying liquid medicine to a pathological part; the multi-channel anti-reflux interstitial fluid drainage device has the beneficial effects that the multi-channel anti-reflux interstitial fluid drainage device has a multi-channel function and anti-reflux performance, is more reasonable in structure, and can better adapt to different clinical application scenes.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an anti-backflow multi-channel puncture and drainage needle. Background Art

[0002] Currently, the application scenarios of puncture and drainage needles in modern interventional treatments are constantly expanding, especially in the palliative treatment of malignant tumors (such as drainage of peritoneal effusions), hematoma removal in hepatobiliary surgery, and debridement of deep abscesses. These applications place stringent demands on the spatial efficiency and functional integration of the devices. The structural defects of traditional puncture needles are becoming increasingly prominent.

[0003] The current multi-channel puncture needle has low space utilization. It adopts a parallel channel design, arranging the channels in parallel in the needle body, resulting in a significant increase in the diameter of the needle body. During the puncture operation, it causes greater damage to the patient's tissue, especially when puncturing deep tissues or operating in a small space. The operation difficulty is greatly increased and it is easy to cause complications, making it difficult to meet the clinical demand for minimally invasive surgery. Summary of the Invention

[0004] (1) Technical issues to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an anti-backflow multi-channel puncture and drainage needle, which solves the technical problem of low space utilization in the prior art, resulting in a significant increase in the diameter of the needle body.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] The present invention provides a backflow-proof multi-channel puncture and drainage needle, comprising a needle body, a main drainage channel, a flushing channel, a drug infusion channel and an backflow-proof component; the main drainage channel is coaxially arranged inside the needle body and extends along the length direction of the needle body, and is used to aspirate tissue fluid at the pathological site; the flushing channel and the drug infusion channel are arranged inside the main drainage channel, and both extend along the length direction of the main drainage channel; the flushing channel is used to transport cleaning fluid to flush and clean the pathological site; the drug infusion channel is used to transport drug solution to the pathological site; the backflow-proof component is arranged in the main drainage channel to prevent backflow of tissue fluid.

[0009] Optionally, the main drainage channel has a main drainage port and a side drainage hole group; the main drainage port is located at the tip of the needle body; the side drainage hole group is opened on the inclined surface of the needle body and is 4 to 5 mm away from the tip.

[0010] Optionally, the side drainage hole group includes multiple side suction holes; the multiple side suction holes are arranged in the needle body along the circumference of the needle body; the angle between the direction of the side suction holes and the axis of the needle body is 25° to 30°.

[0011] Optionally, the flushing channel is provided with multiple flushing tubes; the inlet of the flushing tube is connected to the flushing channel, and the outlet of the flushing tube is located on the bevel of the needle tip, 2 to 3 mm away from the side drainage hole group; the angle between the outlet direction of the flushing tube and the axis of the needle body is 20° to 25°.

[0012] Optionally, the cross-sectional shapes of the main drainage channel, the flushing channel and the drug infusion channel are all circular; and the diameter ratio of the main drainage channel, the flushing channel and the drug infusion channel is 5:2:1.

[0013] Optionally, the anti-backflow component includes a first valve and a second valve; the first valve is arranged in the middle section of the main drainage channel, and the second valve is arranged at the outlet at the end of the main drainage channel.

[0014] Optionally, the first valve includes an umbrella-shaped leaflet, a guide rod, an umbrella rib assembly and a spring; the guide rod is arranged inside the main drainage channel along the axial direction of the main drainage channel, the middle part of the umbrella-shaped leaflet is slidably set on the guide rod through the umbrella rib assembly, the umbrella-shaped leaflet is fixedly connected to the guide rod through the umbrella rib assembly, the spring is sleeved on the guide rod, one end of the spring abuts against the end of the guide rod, and the other end of the spring abuts against the umbrella-shaped leaflet of the guide rod; when the main drainage channel is draining, negative pressure is generated to drive the middle part of the umbrella-shaped leaflet to slide along the guide rod to compress the spring, and the umbrella-shaped leaflet is closed and connected to the main drainage channel under the action of the umbrella rib assembly.

[0015] Optionally, the umbrella rib assembly includes a fixed ring, a sliding ring, a plurality of support rods and a plurality of connecting rods; the sliding ring is slidably mounted on the guide rod, and the fixed ring is fixedly arranged on the guide rod; the sliding ring is closer to the tail of the needle body than the fixed ring; the plurality of support rods are evenly arranged along the circumference on the umbrella-shaped leaflet, and one end of the support rod is rotatably connected to the sliding ring; one end of the plurality of connecting rods is connected to the plurality of support rods one by one, and the other end of the plurality of connecting rods is rotatably connected to the fixed ring.

[0016] Optionally, the second valve includes an elastic flap and a sealing ring; the sealing ring is arranged at the outlet of the main drainage channel, and the elastic flap is rotatably mounted on the sealing ring for selectively closing the main drainage channel; the elastic flap can abut the sealing ring when closing the outlet of the main drainage channel; the negative pressure generated during drainage of the main drainage channel can drive the elastic flap to rotate in a vertical plane to connect the outlet of the main drainage channel.

[0017] Optionally, the elastic petal is provided with an anti-coagulation coating; the ratio of the thickness of the anti-coagulation coating to the thickness of the elastic petal is 1:1000 to 1:5000.

[0018] (3) Beneficial effects

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides an anti-backflow multi-channel puncture and drainage needle, which has a coaxial nested design in which the flushing channel and the drug infusion channel are arranged inside the main drainage channel. This changes the way traditional multi-channel puncture and drainage needles arrange the channels in parallel, and there is no need to reserve additional space for each channel. While meeting the multi-channel function, it effectively reduces the diameter of the needle body, making the needle body structure more compact, providing better spatial conditions for puncture operations, especially when puncturing deep or narrow areas, it can better adapt to the operating environment and reduce the difficulty of puncture. The reasonable layout of the main drainage channel, flushing channel and drug infusion channel enables the puncture and drainage needle to simultaneously achieve multiple functions such as aspirating tissue fluid from the pathological site, delivering cleaning fluid to flush and clean the pathological site, and delivering drug solution to the pathological site in the same operation. The collaborative work of multiple channels avoids the disadvantages of traditional single-channel or single-function puncture needles that require frequent instrument changes or multi-step operations during the treatment process, providing convenience for clinical treatment and making the treatment process more efficient. The anti-backflow component is installed in the main drainage channel, which can effectively prevent the backflow of tissue fluid, provide safety protection for the puncture and drainage process, avoid the spread of infection, aggravation of the disease and other adverse conditions that may be caused by the backflow of tissue fluid, enhance the safety and reliability of the puncture and drainage operation, and provide patients with greater security during treatment. Compared with existing technologies, it has multi-channel functions and anti-backflow performance, while having a more reasonable structure and can better adapt to different clinical application scenarios. Whether in the field of hepatobiliary surgery that requires delicate operations, or in fields such as tumor treatment that have high requirements for treatment effect and safety, it can play a good role, providing strong support for doctors' clinical operations and better protection for patients' treatment effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an anti-backflow multi-channel puncture and drainage needle according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 1 is a cross-sectional schematic diagram of a backflow-proof multi-channel puncture and drainage needle with a tensioner according to Example 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the installation of the first valve in the main channel in Example 1 of the present invention;

[0025] Figure 5 is a schematic structural diagram of the first valve in Example 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the installation of the second valve at the outlet of the main drainage channel in Example 1 of the present invention;

[0027] Figure 7 It is a schematic structural diagram of the second valve in Example 1 of the present invention.

[0028] [Description of Reference Numerals]

[0029] 1: needle body; 2: main drainage channel; 21: main drainage port; 22: side suction hole; 3: flushing channel; 31: flushing tube; 4: drug infusion channel; 51: umbrella-shaped leaflet; 52: guide rod; 53: spring; 54: fixing ring; 55: sliding ring; 56: support rod; 57: connecting rod; 61: elastic petal; 62: sealing ring. DETAILED DESCRIPTION

[0030] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0031] Example 1:

[0032] like Figure 1-Figure 3 As shown, a specific embodiment of the present invention provides an anti-backflow multi-channel puncture and drainage needle, comprising a needle body 1, a main drainage channel 2, a flushing channel 3, a drug infusion channel 4 and an anti-backflow component; the main drainage channel 2 is coaxially arranged inside the needle body 1 and extends along the length direction of the needle body 1, and is used to aspirate tissue fluid at the pathological site; the flushing channel 3 and the drug infusion channel 4 are arranged inside the main drainage channel 2, and both extend along the length direction of the main drainage channel 2; the flushing channel 3 is used to transport cleaning fluid to flush and clean the pathological site; the drug infusion channel 4 is used to transport drug solution to the pathological site; the anti-backflow component is arranged in the main drainage channel 2 to prevent tissue fluid from backflow.

[0033] Specifically, the coaxial nested design of arranging the flushing channel 3 and the drug infusion channel 4 inside the main drainage channel 2 changes the way the channels of the traditional multi-channel puncture and drainage needle are arranged in parallel. There is no need to reserve additional space for each channel. While meeting the multi-channel function, the diameter of the needle body 1 is effectively reduced, making the structure of the needle body 1 more compact, providing better spatial conditions for the puncture operation, especially when puncturing deep or narrow areas, it can better adapt to the operating environment and reduce the difficulty of puncture. The reasonable layout of the main drainage channel 2, the flushing channel 3 and the drug infusion channel 4 enables the puncture and drainage needle to simultaneously achieve multiple functions such as aspirating tissue fluid at the pathological site, delivering cleaning fluid to flush and clean the pathological site, and delivering drug solution to the pathological site in the same operation. The collaborative work of multiple channels avoids the disadvantages of traditional single-channel or single-function puncture needles that require frequent instrument changes or multi-step operations during the treatment process, provides convenience for clinical treatment, and makes the treatment process more efficient. The anti-backflow component is set in the main drainage channel 2, which can effectively prevent the backflow of tissue fluid, providing safety protection for the puncture and drainage process, avoiding adverse conditions such as the spread of infection and worsening of the disease caused by the backflow of tissue fluid, enhancing the safety and reliability of the puncture and drainage operation, and making patients safer during the treatment process. Compared with existing technologies, it has multi-channel functions and anti-backflow performance, while having a more reasonable structure and can better adapt to different clinical application scenarios. Whether in the field of hepatobiliary surgery that requires delicate operations, or in fields such as tumor treatment that have high requirements for treatment effect and safety, it can play a good role, providing strong support for doctors' clinical operations and better protection for patients' treatment effects.

[0034] In this embodiment, the length of the needle body 1 is 15 to 20 cm, which is suitable for a variety of clinical scenarios, such as puncture and drainage of the abdominal cavity, thoracic cavity, etc. It can not only meet the needs of deep tissue operations, but also be convenient for medical staff to operate by hand, ensuring the accuracy of puncture; the outer diameter of the needle body 1 does not exceed 3 mm, which achieves minimally invasiveness. Compared with traditional puncture needles, it causes less damage to the patient's tissue, reduces the risk of infection at the puncture site, and shortens the patient's postoperative recovery time. A plurality of serrations are integrated on the inner wall of the main drainage channel 2. The plurality of serrations are distributed along the length of the main drainage channel 2. The plurality of serrations distributed along the length of the main drainage channel 2 changes the surface morphology of the inner wall of the channel and increases the contact area between the drainage fluid and the channel wall. When the drainage fluid flows through the serrations, the serrations produce a turbulent effect, prompting the flow state of the drainage fluid to change from laminar flow to turbulent flow, accelerating the flow rate of the drainage fluid, thereby improving the overall drainage efficiency and shortening the drainage time. The serrations have a transverse curvature (R1) of 0.23-0.27mm and a longitudinal curvature (R2) of 0.5-0.6mm, creating tiny grooves and protrusions. During drainage, these structures trap tissue fragments, blood clots, and other substances that could potentially block the channel, preventing their accumulation. Furthermore, the serrations' blocking effect on blockages also guides the fluid to disperse or remove them, further reducing the risk of blockage and ensuring continuity and stability of the drainage process.

[0035] Furthermore, if Figure 1 and Figure 2 As shown, the main drainage channel 2 has a main drainage port 21 and a side drainage hole group. Among them, the main drainage port 21 is located at the tip of the needle body 1, which is convenient for accurately locating the core area of ​​the lesion; the side drainage hole group is opened on the inclined surface of the needle body 1, 4 to 5 mm away from the tip, forming a multi-directional drainage layout. The main drainage port 21 realizes targeted suction of the center of the lesion, and the side drainage hole group expands the drainage coverage, avoiding the drainage dead corners that may be caused by a single suction port, and improving the overall drainage efficiency. The side drainage hole group maintains a reasonable distance from the tip, which can reduce direct damage to surrounding tissues during puncture and reduce the risk of bleeding.

[0036] In this embodiment, the side drainage hole group includes multiple side suction holes 22, evenly spaced along the circumference of the needle body 1. The side suction holes 22 are oriented at an angle of 25° to 30° with the axis of the needle body 1. The circumferential distribution of the side suction holes 22, combined with the specific angle design, ensures that the drainage fluid enters the main channel evenly, reducing turbulence, lowering drainage resistance, and improving drainage smoothness. The multi-angle layout of the side suction holes 22 disperses the direction of tissue fragments, preventing blockage of a single channel and ensuring the continuity of the drainage process.

[0037] Furthermore, if Figure 1 and Figure 2As shown, in this embodiment, the flushing channel 3 is equipped with multiple flushing tubes 31. Their inlets are connected to the flushing channel 3, and their outlets are located on the bevel of the needle tip, 2-3 mm from the side drainage hole group. The outlet direction of the flushing tube 31 forms an angle of 20°-25° with the axis of the needle body 1. The distance and angle between the outlet of the flushing tube 31 and the side drainage hole group are designed to enable the cleaning fluid to accurately flush the area near the side suction hole 22, promptly removing tissue debris or secretions that may block the hole and enhancing the drainage effect. The directional discharge of the flushing fluid can form a synergistic effect with the drainage, completing the cleaning of the lesion while draining, reducing the risk of infection and improving the treatment effect.

[0038] Preferably, in this embodiment, the main drainage channel 2, flushing channel 3, and drug infusion channel 4 all have circular cross-sections, with a diameter ratio of 5:2:1. The circular cross-section facilitates machining and reduces fluid resistance. This reasonable diameter ratio optimizes the distribution of channel functions within a limited space, ensuring the flow requirements of the main drainage channel 2 while providing suitable fluid pathways for flushing and drug infusion. The flow gradient created by this diameter ratio reduces fluid interference between channels, ensuring the smooth and simultaneous operation of drainage, flushing, and drug infusion.

[0039] Furthermore, the anti-reflux component includes a first valve located in the middle section of the main drainage channel 2 and a second valve at the terminal outlet, forming a multi-stage anti-reflux barrier. The dual valve design at the middle and terminal sections achieves graded blocking of tissue fluid backflow, improving the reliability and safety of anti-reflux prevention and avoiding the risk of failure of a single valve. Covering the middle and terminal sections of the main drainage channel 2, anti-reflux control is implemented at different stages and locations during the drainage process, fully ensuring drainage safety.

[0040] Further, if Figure 4 and Figure 5 As shown, the first valve consists of an umbrella-shaped leaflet 51, a guide rod 52, an umbrella rib assembly, and a spring 53. The guide rod 52 is arranged axially along the main drainage channel 2. The middle portion of the umbrella-shaped leaflet 51 is slidably mounted on the guide rod 52 and fixedly connected via the umbrella rib assembly. The spring 53 is mounted on the guide rod 52, with its ends respectively abutting the ends of the guide rod 52 and the umbrella-shaped leaflet 51. The negative pressure of the drainage drives the middle portion of the umbrella-shaped leaflet 51 to slide and compress the spring 53, which closes the leaflet and opens the main channel through the umbrella rib assembly. The negative pressure-driven valve opening mechanism can automatically adjust the leaflet state according to the drainage pressure, achieve dynamic conduction of the drainage channel, and ensure timely drainage. The cooperation between the spring 53 and the umbrella rib assembly ensures that the leaflet is reliably open during drainage and closes promptly when drainage stops, effectively preventing backflow in the middle section while ensuring drainage efficiency.

[0041] Specifically, if Figure 4 and Figure 5The umbrella rib assembly includes a fixed ring 54, a sliding ring 55, a plurality of support rods 56, and a plurality of connecting rods 57. The sliding ring 55 can be slidably sleeved on the guide rod 52. The fixed ring 54 is fixed to the guide rod 52 and the sliding ring 55 is closer to the tail end of the needle body 1. The support rods 56 are evenly arranged circumferentially on the umbrella-shaped leaflets 51, one end of which is connected to the sliding ring 55, and the other end of the connecting rod 57 is connected to the fixed ring 54. The structure of the fixed ring 54, the sliding ring 55, the support rods 56, and the connecting rods 57 form a stable mechanical transmission system, ensuring that the umbrella-shaped leaflets 51 open and close synchronously and stably during the sliding process, avoiding the risk of poor drainage or backflow caused by inconsistent leaflet movements. The circumferentially evenly arranged support rods 56 and connecting rods 57 enhance the overall structural strength of the umbrella rib assembly, enabling it to withstand the fluid pressure during the drainage process and ensure the long-term reliable operation of the valve.

[0042] Further, if Figure 6 and Figure 7 As shown, the second valve includes a sealing ring 62 provided at the outlet of the main drainage channel 2 and an elastic flap 61 rotatably mounted on the sealing ring 62. The elastic flap 61 can selectively close the outlet of the channel. When closed, it abuts the sealing ring 62. The negative pressure of the drainage drives the elastic flap 61 to rotate in a vertical plane to open the outlet. The cooperation between the elastic flap 61 and the sealing ring 62 forms a reliable sealing structure at the outlet, preventing tissue fluid from flowing back from the end and ensuring drainage safety. The negative pressure-driven rotation opening method enables the valve to quickly respond to changes in drainage pressure, open or close the outlet in time, and ensure smooth and safe drainage. In this embodiment, the elastic flap 61 has an anti-coagulant coating, and the ratio of the coating thickness to the flap thickness is 1:1000 to 1:5000. The anti-coagulant coating can reduce the adhesion and coagulation of blood components on the flap surface, reduce the risk of thrombosis, make it suitable for long-term implantation, and improve the biocompatibility of the device. A reasonable coating-to-petal thickness ratio ensures the anti-coagulation function while not affecting the mechanical properties and movement sensitivity of the elastic petal 61, thereby ensuring the normal operation of the valve.

[0043] The anti-backflow multi-channel puncture and drainage needle provided in this embodiment is used as follows: under image guidance (such as B-ultrasound, CT), the tip of the needle body 1 is aligned with the center of the lesion, and the main drainage port 21 is the first to contact the tissue fluid; the side drainage hole group on the bevel of the needle body 1 avoids the blood vessels during the needle insertion process. The negative pressure suction device is activated, and the serrated structure of the main drainage channel 2 disturbs the fluid, improving the drainage efficiency, while blocking tissue fragments to prevent blockage; the umbrella-shaped leaflet 51 of the first valve in the middle section compresses the spring 53 under the action of negative pressure to close, forming an annular drainage channel; the elastic flap 61 of the second valve at the end rotates open under the action of negative pressure to ensure smooth drainage. When the negative pressure disappears, the spring 53 of the first valve resets to push the umbrella-shaped leaflet 51 open, and the elastic flap 61 of the second valve resets to abut the sealing ring 62, doubly blocking the backflow path. When the lesion is flushed, the cleaning fluid is delivered to the pathological site through the flushing channel 3. After flushing, the drug solution is delivered to the pathological site through the drug infusion channel 4.

[0044] Example 2:

[0045] This embodiment provides a backflow-proof multi-channel puncture and drainage needle, which includes all the structures of the puncture and drainage needle in Example 1.

[0046] In this embodiment, the diameter of the flushing channel 3 is 0.7 to 0.9 mm, ensuring that the flow rate of the flushing liquid is moderate, which can provide sufficient flushing force to remove tissue fragments and inflammatory substances at the lesion site, and avoid impact damage to the lesion area due to excessive flow. The flow rate of the flushing liquid within this diameter range can be stably maintained at 8-12 mL / min, meeting the needs of routine clinical debridement. The axial distance between it and the main drainage channel 2 is 1.1 to 1.3 mm, which ensures the structural strength of the flushing channel 3 while ensuring that the fluids between the two channels do not interfere with each other. The inlet of the flushing channel 3 is located on the side of the tail end of the needle body 1 and is connected to an external flushing bottle. A one-way valve is provided at the inlet of the flushing channel 3 to prevent backflow contamination of the flushing liquid.

[0047] In this embodiment, the diameter of the drug infusion channel 4 is 0.35-0.45 mm. The inlet of the drug infusion channel 4 is located at the rear end of the needle body 1 and is connected to a drug infusion pump. A flow control valve is also installed at the inlet of the drug infusion channel 4. The drug infusion channel 4 has two to three outlets, evenly distributed along the circumference of the needle body 1 on the bevel of the needle body 1, 1-2 mm from the needle tip. This allows precise drug release to the core of the lesion, making it suitable for applications such as localized tumor chemotherapy that require high drug concentrations and reduces the impact of drug diffusion on surrounding normal tissue. The outlet of the drug infusion channel 4 is located near the outlet of the irrigation channel 3. The flow of the irrigation fluid drives drug diffusion, expanding the drug coverage area while preventing excessive local drug concentrations, making it suitable for treating large-area inflammation. The outlet of the drug infusion channel 4 forms an angle of 15°-30° with the axis of the needle body 1, allowing the drug to be ejected at a certain angle, increasing the drug's penetration depth in the tissue while reducing direct impact on the tissue.

[0048] Example 3:

[0049] This embodiment provides a backflow-proof multi-channel puncture and drainage needle, which includes all the structures of the puncture and drainage needle in Example 1.

[0050] In this embodiment, the needle body 1 utilizes a multi-stage nested retractable structure, consisting of a core fixed tube, a middle telescopic tube assembly, and an outer protective sleeve. The core fixed tube is made of medical-grade 316L stainless steel with a constant inner diameter and is used to secure the main drainage channel 2, ensuring its stability and tightness. The middle telescopic tube assembly consists of three to five thin-walled titanium alloy tubes of varying diameters, connected by precision threads or nested grooves, allowing for axial sliding and retraction along the needle body 1. Each telescopic tube section is equipped with a positioning slot. When the telescopic tube is extended to the target position, the slot engages with a snap-fitting protrusion on the inner wall of the outer protective sleeve to secure it. The outer protective sleeve is made of polyetheretherketone (PEEK) for high strength and biocompatibility. The inner wall of the protective sleeve is marked with scale markings corresponding to the diameter of the needle body 1 in different telescopic states (e.g., 2.0 mm, 2.5 mm, 3.0 mm, etc.), and the outer wall is provided with a non-slip texture for ease of operation by medical personnel.

[0051] Specifically, to facilitate adjustment of the needle's diameter, a rotary adjustment knob is located at the end of the needle. This knob is connected to the middle telescopic tube assembly via an internal gear mechanism. Turning the knob clockwise causes the gears to extend the telescopic tubes, increasing the diameter of the needle. Counterclockwise rotation retracts the tubes, decreasing their diameter. A locking mechanism is incorporated into the knob, allowing it to be locked with a single click once the target diameter is reached, preventing accidental changes in the needle's diameter during surgery.

[0052] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0053] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-channel puncture and drainage needle with anti-backflow function, characterized in that: include: A needle body (1), a main drainage channel (2), a flushing channel (3), a drug infusion channel (4), and an anti-backflow component; The main drainage channel (2) is coaxially arranged inside the needle body (1) and extends along the length direction of the needle body (1) for aspirating tissue fluid at the pathological site; The flushing channel (3) and the drug perfusion channel (4) are arranged inside the main drainage channel (2), and both extend along the length direction of the main drainage channel (2); the flushing channel (3) is used to transport cleaning fluid to flush and clean the pathological area; the drug perfusion channel (4) is used to transport drug solution to the pathological area; The anti-backflow component is arranged in the main drainage channel (2) to prevent the tissue fluid from backflowing.

2. The anti-backflow multi-channel puncture and drainage needle according to claim 1, characterized in that: The main drainage channel (2) has a main drainage port (21) and a group of side drainage holes; The main drainage port (21) is located at the tip of the needle body (1); the side drainage hole group is opened on the inclined surface of the needle body (1) and is 4 to 5 mm away from the tip.

3. The anti-backflow multi-channel puncture and drainage needle according to claim 2, characterized in that: The side drainage hole group includes a plurality of side suction holes (22); A plurality of side suction holes (22) are arranged in the needle body (1) along the circumference of the needle body (1); the angle between the orientation of the side suction holes (22) and the axis of the needle body (1) is 25° to 30°.

4. The anti-backflow multi-channel puncture and drainage needle according to claim 2, characterized in that: The flushing channel (3) is provided with a plurality of flushing pipes (31); The inlet of the flushing tube (31) is connected to the flushing channel (3), and the outlet of the flushing tube (31) is located on the bevel of the needle tip, 2 to 3 mm away from the side drainage hole group; The angle between the outlet direction of the flushing tube (31) and the axis of the needle body (1) is 20° to 25°.

5. The anti-backflow multi-channel puncture and drainage needle according to claim 1, characterized in that: The cross-sectional shapes of the main drainage channel (2), the flushing channel (3) and the drug infusion channel (4) are all circular; The diameter ratio of the main drainage channel (2), the flushing channel (3) and the drug perfusion channel (4) is 5:2:

1.

6. The anti-backflow multi-channel puncture and drainage needle according to claim 1, characterized in that: The anti-reflux component includes a first valve and a second valve; The first valve is arranged in the middle section of the main drainage channel (2), and the second valve is arranged at the outlet at the end of the main drainage channel (2).

7. The anti-backflow multi-channel puncture and drainage needle according to claim 6, characterized in that: The first valve comprises an umbrella-shaped leaflet (51), a guide rod (52), an umbrella rib assembly and a spring (53); The guide rod (52) is arranged inside the main drainage channel (2) along the axial direction of the main drainage channel (2); the middle part of the umbrella-shaped leaflet (51) is slidably arranged on the guide rod (52) through the umbrella rib assembly; the umbrella-shaped leaflet (51) is fixedly connected to the guide rod (52) through the umbrella rib assembly; the spring (53) is sleeved on the guide rod (52); one end of the spring (53) abuts against the end of the guide rod (52); and the other end of the spring (53) abuts against the umbrella-shaped leaflet (51) of the guide rod (52); When the main drainage channel (2) is draining, negative pressure is generated, which drives the middle part of the umbrella-shaped leaflet (51) to slide along the guide rod (52) to compress the spring (53). Under the action of the umbrella rib assembly, the umbrella-shaped leaflet (51) is closed and the main drainage channel (2) is opened.

8. The anti-backflow multi-channel puncture and drainage needle according to claim 7, characterized in that: The umbrella rib assembly comprises a fixing ring (54), a sliding ring (55), a plurality of supporting rods (56) and a plurality of connecting rods (57); The sliding ring (55) is slidably mounted on the guide rod (52), and the fixing ring (54) is fixedly mounted on the guide rod (52); the sliding ring (55) is closer to the tail of the needle body (1) than the fixing ring (54); a plurality of support rods (56) are evenly arranged along the circumference on the umbrella-shaped leaflet (51), and one end of the support rod (56) is rotatably connected to the sliding ring (55); one end of the plurality of connecting rods (57) is connected to the plurality of support rods (56) in a one-to-one correspondence, and the other end of the plurality of connecting rods (57) is rotatably connected to the fixing ring (54).

9. The anti-backflow multi-channel puncture and drainage needle according to claim 6, characterized in that: The second valve comprises an elastic flap (61) and a sealing ring (62); The sealing ring (62) is arranged at the outlet of the main drainage channel (2), and the elastic flap (61) is rotatably mounted on the sealing ring (62) for selectively closing the main drainage channel (2); the elastic flap (61) can abut against the sealing ring (62) when closing the outlet of the main drainage channel (2); The negative pressure generated when the main drainage channel (2) is draining can drive the elastic flap (61) to rotate in a vertical plane to connect to the outlet of the main drainage channel (2).

10. The anti-backflow multi-channel puncture and drainage needle according to claim 9, characterized in that: The elastic flap (61) is provided with an anti-coagulant coating; The ratio of the thickness of the anticoagulant coating to the thickness of the elastic flap (61) is 1:1000 to 1:5000.

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