A medical device

Abstract

The present application belongs to the technical field of medical devices, and discloses a medical device, which comprises a joint, a catheter and a guide wire, one end of the catheter is connected with the joint, the guide wire is arranged in the catheter, one end of the guide wire is connected with the joint and the other end of the guide wire extends out of the catheter, the pipe opening of the other end of the guide wire is in a sealed arrangement to prevent the drug liquid injected into the catheter from flowing out of the pipe opening of the other end of the catheter away from the joint, the medical device further comprises an elastic part and a protruding part, the elastic part is sleeved on the other end of the guide wire, the protruding part is sleeved on the outer periphery of the guide wire, the protruding part is connected between the elastic part and the catheter, the diameter of the protruding part is greater than the diameter of the catheter and the elastic part, when the catheter is pulled in the blood vessel, the protruding part not only avoids damaging the medical device, but also effectively reduces the risk of catheterization thrombolysis, and can also crush and dredge the thrombus in advance, so as to increase the contact area of the drug liquid and accelerate the absorption rate of the drug liquid, thereby improving the treatment effect.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a medical device. Background Technology

[0002] Peripheral vascular thrombotic occlusive diseases are classified into venous thromboembolism and arterial thromboembolism. Current conventional treatments for thrombosis include anticoagulation therapy, surgery, and catheter-directed thrombolysis. Catheter-directed thrombolysis works by directly infusing high concentrations of thrombolytic drugs into the vicinity of the thrombus through a catheter, dissolving the thrombus and achieving the therapeutic goal. Compared to traditional catheter-directed thrombectomy, catheter-directed thrombolysis does not require general anesthesia, has less surgical trauma, and avoids repeated catheter dragging within the blood vessel, reducing vascular damage. Therefore, it is a relatively ideal treatment method for thrombosis.

[0003] During catheter-directed thrombolysis, as the thrombolytic catheter infuses the body with thrombolytic drugs, the solution flows out from the catheter's outlet to flush the thrombus and ultimately dissolve it. In existing technology, the thrombolytic catheter includes a connector, guidewire, catheter, and occluder. One end of the catheter is connected to the connector, and the other end is connected to the occluder. The guidewire is placed inside the catheter, with one end connected to the connector and the other end extending out of the catheter. The occluder is fitted over the extended guidewire, with one end able to penetrate the catheter to form a seal, preventing the medication from flowing directly out from the central hole at the catheter's end. The occluder also prevents the guidewire tip from puncturing the blood vessel. The diameter of the occluder is very close to that of the catheter. However, because the location of the thrombus is not fixed—the catheter must pass through various curved blood vessels—the occluder may rub against the vessel wall and be damaged when the catheter is pulled in and out of the blood vessel, potentially damaging the thrombolytic catheter and the blood vessel itself, increasing the risks of catheter-directed thrombolysis. Moreover, when the catheter needs to reach a location with severe intravascular embolism, there may be a large thrombus in the blood vessel. The medication flowing out of the catheter's outlet cannot fully dissolve the thrombus, which greatly reduces the treatment effect.

[0004] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a medical device that can avoid damage to the medical device when withdrawing the catheter, thereby effectively reducing the risk of catheter-directed thrombolysis, and can also fully dissolve thrombi to improve the treatment effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A medical device includes a connector, a catheter, and a guidewire. One end of the catheter is connected to the connector, and the guidewire is placed inside the catheter. One end of the guidewire is connected to the connector, and the other end extends out of the catheter. The medical device further includes:

[0008] The elastic part is sleeved on the other end of the guidewire; and

[0009] A protrusion is fitted around the outer periphery of the guidewire, and the protrusion is connected between the elastic part and the catheter. The diameter of the protrusion is larger than the diameter of the catheter and the elastic part.

[0010] Preferably, the protrusion includes two protrusions, each protruding in the shape of a frustum, with their lower surfaces touching and their upper surfaces connected to the conduit and the elastic portion, respectively.

[0011] Preferably, the two protrusions are arranged symmetrically.

[0012] Preferably, the diameter of the guidewire gradually decreases from the connector toward the elastic portion, and / or the diameter of the catheter gradually decreases from the connector toward the protrusion.

[0013] Preferably, the other end of the conduit has multiple outlet holes on its wall, and the other end of the conduit is sealed.

[0014] Preferably, the catheter comprises:

[0015] The first tube is connected to the connector; and

[0016] The second tube is connected between the first tube and the protrusion. The hardness of the second tube is greater than that of the first tube, and the plurality of liquid outlet holes are located on the second tube.

[0017] Preferably, the elastic part includes at least one spring.

[0018] Preferably, the elastic part includes a second spring and a third spring, the second spring is sleeved on the outer periphery of the third spring, the end of the guide wire extending out of the conduit is flush with the end of the third spring, and the end of the third spring is flush with the end of the second spring.

[0019] Preferably, the fatigue strength of the second spring is greater than that of the third spring, and / or the developing ability of the third spring is greater than that of the second spring.

[0020] Preferably, the end of the elastic portion away from the conduit is provided with a hemispherical end.

[0021] The beneficial effects of this invention are as follows: The sealed end of the catheter away from the connector prevents the injected medication from flowing out from this end. Simultaneously, the invention includes an elastic portion that prevents the tip of the guidewire from puncturing blood vessels. Furthermore, the elasticity of the elastic portion significantly reduces the impact on the guidewire's movement within the various curved blood vessels. The medical device also features a protrusion that provides adequate space for the elastic portion when the catheter is pulled out of the blood vessel, reducing contact between the elastic portion and the vessel wall. This avoids damage to the medical device when pulling the catheter out and effectively reduces the risks associated with catheter-directed thrombolysis. Additionally, when the medical device moves towards areas with severe embolism, the protrusion near the elastic portion can pre-emptively break up and clear the thrombus, thereby increasing the contact area with the medication, accelerating absorption, and improving treatment efficacy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the medical device in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 yes Figure 1 A magnified view of a section at point B.

[0025] In the picture:

[0026] 1. Connector; 11. Connecting pipe;

[0027] 2. Guide tube; 21. First tube section; 22. Second tube section; 221. Liquid outlet;

[0028] 3. Guidewire;

[0029] 4. Elastic part; 41. End;

[0030] 5. Protrusion; 51. Protrusion. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the medical device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0035] In existing technologies, medical devices include a connector, a guidewire, a catheter, and an occluder. The connector can connect to an external instrument, which can inject thrombolytic drugs into the catheter. The guidewire can strengthen the catheter, guide and support it through soft tissues such as subcutaneous tissue and blood vessel walls, and enter the blood vessel through the puncture hole. It can also guide the catheter through tortuous and hardened blood vessels, selectively entering the branch of the blood vessel being examined. The occluder is fitted onto the guidewire extending from the catheter to prevent the tip of the guidewire from puncturing the blood vessel. One end of the occluder can extend into the catheter to form a sealing structure between the occluder and the catheter, thereby preventing the drug from flowing directly out from the central hole at the end of the catheter and ensuring the therapeutic effect. However, because the diameter of the occluder is very close to that of the catheter, the occluder may be damaged when the catheter is withdrawn due to the resistance and frictional resistance generated by blood flow.

[0036] To address the aforementioned problems, this embodiment provides a medical device. Please refer to [link / reference]. Figures 1 to 3The medical device includes a connector 1, a catheter 2, and a guidewire 3. One end of the catheter 2 is connected to the connector 1, and the other end of the catheter wall is provided with multiple outlet holes 221. The liquid injected into the catheter 2 can flow out through the multiple outlet holes 221. The guidewire 3 is placed inside the catheter 2. One end of the guidewire 3 is connected to the connector 1, and the other end extends out of the catheter 2. The other end of the catheter 2 is sealed. The medical device also includes an elastic part 4 and a protrusion 5. The elastic part 4 is sleeved on the other end of the guidewire 3, and the protrusion 5 is sleeved on the outer periphery of the guidewire 3. The protrusion 5 is connected between the elastic part 4 and the catheter 2, and the diameter of the protrusion 5 is larger than the diameter of the catheter 2 and the elastic part 4.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the end of the sealed catheter 2 away from the connector 1 is closed to prevent the medication injected into the catheter 2 from flowing out from the end of the catheter 2 away from the connector 1. At the same time, this embodiment is provided with an elastic part 4, which can prevent the tip of the guidewire 3 extending from the catheter 2 from puncturing the blood vessel. In addition, due to the elasticity of the elastic part 4 itself, the influence of the guidewire 3 on the movement of various curved blood vessels in the human body is greatly reduced. The medical device is also provided with a protrusion 5. When the catheter 2 is pulled out in the blood vessel, the protrusion 5 can provide appropriate space for the elastic part 4, reducing the contact between the elastic part 4 and the inner wall of the blood vessel. This not only avoids damage to the medical device when the catheter 2 is pulled out, but also effectively reduces the risk of catheter thrombolysis. When the medical device moves to the location of severe embolism in the blood vessel, the protrusion 5 near the elastic part 4 can mechanically break up and clear the thrombus in advance, thereby increasing the contact area of ​​the medication during subsequent medication, accelerating the absorption rate of the medication, and improving the treatment effect.

[0038] In summary, since the protrusion 5 near the elastic part 4 can mechanically break up and clear the thrombus beforehand, the medical device in this embodiment can be used not only as a thrombolytic catheter for thrombolysis but also as a clearing catheter. When the medical device is used only as a clearing catheter, the protrusion 5 can mechanically break up and clear the thrombus in the blood vessel, creating a passageway for other medical devices to pass through. When the medical device is used as a thrombolytic catheter, the medication injected into the catheter 2 can effectively dissolve the broken thrombus. That is, when the medical device is used as a thrombolytic catheter in interventional surgery, the interventional surgery does not require a dedicated clearing catheter to clear the blood vessel, greatly reducing the patient's treatment costs, while also improving the operability and efficiency of the interventional surgery and reducing its operational difficulty.

[0039] Specifically, in this embodiment, the end of the catheter 2 away from the connector 1 is sealed to the guidewire 3, which can prevent the medication injected into the catheter 2 from flowing out from the end of the catheter 2 away from the connector 1, thus ensuring the therapeutic effect. In this embodiment, there is no need to set a sealing device. However, in order to avoid the tip of the guidewire 3 extending from the catheter 2 from puncturing blood vessels, and at the same time, in order to minimize the impact on the movement of the guidewire 3 in various curved blood vessels in the human body, an elastic part 4 is adaptively provided in this embodiment. The elastic part 4 can cover the guidewire 3. Moreover, since the elastic part 4 is elastic, it can prevent the tip of the guidewire 3 from puncturing blood vessels without affecting the movement of the guidewire 3. However, the smooth catheter 2 cannot guarantee that the elastic part 4 will not be damaged due to frictional resistance with the blood vessel wall when the catheter 2 is pulled in the blood vessel. In order to avoid the problem of damage to the elastic part 4, in this embodiment, the medical device is also provided with a protrusion 5. The two ends of the protrusion 5 are respectively connected to the elastic part 4 and the catheter 2, that is, the guide wire 3 can pass through the protrusion 5. The diameter of the protrusion 5 is larger than the diameter of the catheter 2 and the elastic part 4. When the catheter 2 is pulled in the blood vessel, the protrusion 5 can provide appropriate space for the elastic part 4, reduce the contact between the elastic part 4 and the inner wall of the blood vessel, avoid the elastic part 4 being pulled and damaged, and at the same time avoid damage to human blood vessels, reducing the risk of catheter thrombolysis. Moreover, when the medical device moves toward the thrombus site and enters the area of ​​severe embolism in the blood vessel, the protrusion 5, which has a large diameter, can mechanically break up and clear the large thrombus beforehand, crushing it into smaller pieces. This increases the contact area between the medication and the thrombus, accelerates the absorption rate of the medication, and improves the therapeutic effect.

[0040] Understandably, in existing thrombolytic catheters, the guidewire and catheter are independent structures. During catheter-based thrombolysis, the guidewire is pre-moved a certain distance within the blood vessel, and then the catheter follows the path established by the guidewire. Through the coordinated operation of the guidewire and catheter, the catheter passes through the blood vessel and reaches the lesion. In this embodiment, however, the catheter 2 and guidewire 3 are fixedly connected, and the catheter 2 can move together with the guidewire 3. Medical personnel can simultaneously pass the guidewire 3 and catheter 2 through the blood vessel and reach the lesion in one procedure, simplifying the surgical steps, shortening the surgical time, reducing the surgical difficulty, and improving the surgical success rate.

[0041] In this embodiment, the connector 1 is a Luer connector 1. Since the Luer connector 1 is a structure well known to those skilled in the art, the structure and working principle of the Luer connector 1 will not be described in detail here.

[0042] It is understood that the end of the catheter 2 away from the connector 1 is sealed with the guide wire 3 by applying adhesive. Of course, in other optional embodiments, the end of the catheter 2 away from the connector 1 can also be sealed with the guide wire 3 by other means. This embodiment does not make specific limitations.

[0043] To facilitate control of the guidewire 3's movement within the blood vessel, the guidewire 3 furthest from the connector 1 needs sufficient flexibility, while the guidewire 3 closer to the connector 1 needs sufficient rigidity. Therefore, in this embodiment, the diameter of the guidewire 3 gradually decreases from the connector 1 towards the elastic portion 4, and the diameter of the catheter 2 gradually decreases from the connector 1 towards the protrusion 5. The thinner guidewire 3 can meet the flexibility required for its movement in the tortuous blood vessel, while the thicker guidewire 3 can meet the rigidity required for controlling its movement. Simultaneously, since the diameter of blood vessels in the human body gradually decreases from the main pathway to the branch pathways and then to the terminal portion, the catheter 2, with its gradually decreasing diameter, can adapt to the changes in the diameter of the blood vessel.

[0044] Please see Figure 1 The protrusion 5 includes two protrusions 51, which are symmetrically arranged. Each protrusion 51 is frustoconical, and their lower surfaces are in contact. The upper surfaces of the two protrusions 51 are connected to the conduit 2 and the elastic part 4, respectively. A channel is formed between the upper and lower surfaces of the two protrusions 51, and the channels of the two protrusions 51 are interconnected. The end of the conduit 2 away from the connector 1 can extend into the channel of one protrusion 51, while the guide wire 3 can extend out from the channel of the other protrusion 51. The end of the elastic part 4 near the protrusion 5 extends into the channel of the other protrusion 51. The connection between the conduit 2 and the protrusion 5, and the connection between the elastic part 4 and the protrusion 5 are welded. Since both protrusions 51 are truncated cones, meaning that the sides of both protrusions 51 are inclined, when the medical device enters the blood vessel and moves toward the thrombus site or pulls the catheter 2 outward, it can reduce the contact between the elastic part 4 and the inner wall of the blood vessel and effectively reduce blood resistance. At the same time, when the medical device moves toward the thrombus site and enters the area of ​​severe embolism in the blood vessel, the inclined protrusions 5 are conducive to crushing large thrombi into smaller thrombi, which can effectively mechanically break up and clear large thrombi, thereby increasing the contact area between the medication and the thrombus during subsequent medication, and further improving the treatment effect.

[0045] It is understandable that, for ease of manufacturing, in this embodiment, the two protrusions 51 are integrally formed.

[0046] Furthermore, the protrusion 5 is made of a soft material. In this embodiment, the protrusion 5 is made of Pebax material to prevent damage to human blood vessels.

[0047] Because the location of the thrombus is not fixed, catheter 2 needs to pass through various tortuous blood vessels after entering the body to finally reach the thrombus location. Furthermore, during the movement of catheter 2, it is necessary to prevent damage to blood vessels. Therefore, in existing technologies, catheter 2 is made of soft materials. The outlet hole 221 is laser-cut into the soft material catheter 2. Since soft materials are relatively soft and easily deformed, their machinability is not excellent. Therefore, the precision of the cut hole is low, and problems such as burrs and deformation are prone to occur. Insufficient precision of the outlet hole 221 leads to a large deviation between the theoretical and actual values ​​of the outflow rate, affecting the calculation of the actual medication dosage, thus affecting the control of medication dosage by medical staff. At the same time, the outlet hole 221 on the soft material catheter 2 may deform under stress, causing the hole size to decrease or become blocked, resulting in a reduced or even no outflow of medication. Therefore, if… Figure 1 and Figure 3 As shown, in this embodiment, the catheter 2 includes a first tube 21 and a second tube 22. The first tube 21 is connected to the connector 1 and is made of a soft material. The second tube 22 is connected between the first tube 21 and the protrusion 5. Multiple outlet holes 221 are located on the second tube 22, which is made of a metal material. The metal material has high hardness, and the hardness of the second tube 22 is greater than that of the first tube 21, making it easier to process the multiple outlet holes 221 with high precision. Moreover, the metal material of the second tube 22 ensures that the outlet holes 221 in all four directions around the catheter 2 can stably release drugs. At the same time, metal has imaging ability, which can accurately locate the outlet holes 221 in clinical surgery. Conversely, soft materials do not have imaging ability and cannot locate the outlet holes 221. Furthermore, in this embodiment, the length of the first tube 21 is much greater than the length of the second tube 22, which greatly reduces the impact on the movement of the catheter 2.

[0048] It is understood that the second tube section 22 may be made of high-density metals such as gold, platinum and tungsten, which have stronger developing capabilities. This embodiment does not make specific limitations.

[0049] Furthermore, machining a liquid outlet hole 221 on the second tube portion 22 of the metal material not only ensures the machining accuracy of the liquid outlet hole 221, but also allows for the machining of a very small liquid outlet hole 221. A smaller liquid outlet hole 221 is beneficial for medical staff to more accurately control the dosage of medication. In this embodiment, the cross-sectional area of ​​the liquid outlet hole 221 is preferably 0.03 square millimeters. Of course, in other optional embodiments, the cross-sectional area of ​​the liquid outlet hole 221 can also be other values, and this embodiment does not impose a specific limitation.

[0050] like Figure 1As shown, the connector 1 includes a connecting tube 11, and a first tube portion 21 is connected to the connector 1 through the connecting tube 11. One end of the guide wire 3 extends into the connecting tube 11, and the hardness of the connecting tube 11 is greater than that of the first tube portion 21. In this embodiment, the catheter 2 is connected to the Luer connector 1 through a connecting tube 11 to prevent the connection between the catheter 2 and the Luer connector 1 from bending.

[0051] Understandably, the end of the guide wire 3 placed inside the catheter 2 near the Luer connector 1 can extend into and be welded to the connecting tube 11.

[0052] In this embodiment, the elastic part 4 includes a spring, that is, the elastic part 4 is a first spring. The first spring can prevent the tip of the guidewire 3 extending from the catheter 2 from puncturing blood vessels. At the same time, due to the elasticity of the elastic part 4 itself, the impact on the movement of the guidewire 3 in various curved blood vessels in the human body is greatly reduced. The first spring is made of metal material. Since metal material has imaging capabilities, it is convenient for medical personnel to monitor the position of the guidewire 3 in real time. At the same time, it reduces the manufacturing cost of the medical device.

[0053] like Figure 2 As shown, a hemispherical end 41 is provided at the end of the elastic part 4 away from the catheter 2. Welding the end 41 at the end of the elastic part 4 away from the catheter 2 can prevent the elastic part 4 from damaging the blood vessel during movement.

[0054] Example 2

[0055] Compared to Embodiment 1, the difference in this embodiment is that the elastic part 4 includes a second spring and a third spring. The second spring is sleeved on the outer periphery of the third spring. The end of the guidewire 3 extending from the catheter 2 is flush with the end of the second spring, and the end of the third spring is flush with the end of the second spring. The elastic part 4 is made of metal material. Since the metal material has imaging capabilities, medical staff can monitor the position of the guidewire 3 in real time.

[0056] Furthermore, the second spring is made of a high-strength metal material, and the third spring is made of a high-density metal material. The fatigue strength of the second spring is greater than that of the third spring, and the imaging capability of the third spring is greater than that of the second spring. Because of its higher fatigue strength, the second spring can provide higher elasticity and is less prone to damage from pulling or bending. The second spring can be made of stainless steel. At the same time, to ensure that medical staff can accurately monitor the position of guidewire 3, a third spring is set inside the second spring. The third spring can be made of high-density metals with stronger imaging capabilities, such as gold, platinum, and tungsten.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A medical device comprising a connector (1), a catheter (2), and a guidewire (3), one end of the catheter (2) being connected to the connector (1), and the guidewire (3) being placed inside the catheter (2), characterized in that, One end of the guidewire (3) is connected to the connector (1) and the other end extends out of the catheter (2). The other end of the catheter (2) is sealed. The medical device further includes: An elastic part (4) is fitted onto the other end of the guidewire (3), and the elastic part (4) can prevent the tip of the guidewire (3) extending out of the catheter (2) from puncturing blood vessels; and The protrusion (5) is sleeved on the outer periphery of the guide wire (3). The protrusion (5) is connected between the elastic part (4) and the catheter (2). The diameter of the protrusion (5) is larger than the diameter of the catheter (2) and the elastic part (4). The elastic part (4) includes at least one spring; the elastic part (4) includes a second spring and a third spring, the second spring is sleeved on the outer periphery of the third spring, the end of the guide wire (3) extending out of the conduit (2) is flush with the end of the second spring, and the end of the third spring is flush with the end of the second spring; the fatigue strength of the second spring is greater than the fatigue strength of the third spring, and / or the imaging ability of the third spring is greater than the imaging ability of the second spring.

2. The medical device according to claim 1, characterized in that, The protrusion (5) includes two protrusions (51), which are frustum-shaped and have their lower surfaces touching. The upper surfaces of the two protrusions (51) are connected to the conduit (2) and the elastic part (4) respectively.

3. The medical device according to claim 2, characterized in that, The two protrusions (51) are arranged symmetrically.

4. The medical device according to claim 1, characterized in that, The diameter of the guidewire (3) gradually decreases from the connector (1) toward the elastic part (4), and / or the diameter of the catheter (2) gradually decreases from the connector (1) toward the protrusion (5).

5. The medical device according to claim 1, characterized in that, The other end of the conduit (2) has multiple outlet holes (221) on its wall, and the other end of the conduit (2) is sealed.

6. The medical device according to claim 5, characterized in that, The catheter (2) includes: The first tube (21) is connected to the connector (1); and The second tube (22) is connected between the first tube (21) and the protrusion (5). The hardness of the second tube (22) is greater than that of the first tube (21). A plurality of liquid outlet holes (221) are located on the second tube (22).

7. The medical device according to claim 1, characterized in that, The elastic part (4) is provided with a hemispherical end (41) at the end away from the conduit (2).

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