Fluid sealing device and fluid pumping equipment

Abstract

The present invention provides a fluid blocking device and a fluid pumping device. The fluid blocking device is used in conjunction with a fluid pumping conduit. The fluid pumping conduit includes at least one fluid outlet. The fluid blocking device is used to be sleeved on the fluid pumping conduit. The fluid blocking device includes an inner layer and an outer layer that are nested. When the fluid blocking device is located at the fluid outlet, the inner layer covers at least one fluid outlet. The outer layer has a stiffness greater than that of the inner layer. The arrangement of the inner and outer layers in the present invention allows the fluid blocking device to have both flexibility and rigidity as a whole. The inner layer effectively blocks or seals the fluid outlet to prevent fluid from leaking from the outlet. The outer layer provides sufficient strength support for the fluid pumping conduit, solving the problem of deformation of the fluid outlet channel due to excessive external force.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a fluid blocking device and a fluid pumping equipment. Background Art

[0002] In the prior art, artificial ventricular assist devices (AVDs) are primarily used in high-risk PCI procedures to provide patients with stable blood flow support, reduce cardiac burden, minimize intraoperative risks, and facilitate postoperative recovery. The primary mechanism of an AVD is a blood pumping catheter, with an inflow channel at the distal end and an outflow channel at the proximal end. During the insertion of the AVD into the human body, if the inflow channel enters the artery but the outflow channel does not, arterial hypertension can cause a large amount of blood to escape from the outflow channel. Furthermore, as the AVD passes through the sheath, the sheath bends or the naturally curved angles of the blood vessels create significant resistance to the passage of the AVD through the sheath and the blood vessels. This requires the operator to apply considerable force to pinch the outflow channel or the area near the outflow channel to push the AVD into the sheath and distally. This high force can cause the outflow channel to distort, leading to insufficient blood flow from the AVD and even exacerbating blood cell damage. While reducing the insertion time of the AVD can reduce blood leakage, this approach requires a high level of operator proficiency and still does not address the issue of blood leakage. In addition, existing technologies have also disclosed solutions for reducing bleeding volume by covering the outflow channel with a cannula to reduce the flow area of ​​the outflow channel. However, such solutions fail to address the problem of deformation of the outflow channel due to the operator's high force. Furthermore, removing the cannula typically requires the operator to use both hands, involving multiple steps, which is cumbersome and time-consuming. Summary of the Invention

[0003] In order to overcome at least one of the problems in the related art, a first aspect of the present invention provides a fluid blocking device.

[0004] Wherein, the fluid blocking device is used in conjunction with a fluid pumping conduit, and the fluid pumping conduit includes at least one fluid discharge port.

[0005] The fluid blocking device is used to be sleeved on the fluid pumping conduit;

[0006] The fluid blocking device comprises an inner layer and an outer layer which are nested. When the fluid blocking device is located at the fluid outlet, the inner layer covers at least one of the fluid outlets.

[0007] The rigidity of the outer layer is greater than that of the inner layer.

[0008] In some optional embodiments, the inner layer is provided with a first slit, and the first slit extends from the proximal end surface of the inner layer to the distal end surface of the inner layer;

[0009] The outer layer is provided with a second slit, and the second slit extends from the proximal end surface of the outer layer to the distal end surface of the outer layer;

[0010] The first gap and the second gap are arranged opposite to each other.

[0011] In some optional embodiments, when the inner layer is in contact with the surface of the fluid pumping conduit, the arc distance in the circumferential direction between the portions on both sides of the first slit that are in contact with the surface of the fluid pumping conduit is the minimum width of the first slit.

[0012] In some optional embodiments, the minimum width of the second slit is greater than the minimum width of the first slit, and / or the minimum width of the second slit is greater than or equal to the diameter of the fluid pumping conduit.

[0013] In some optional embodiments, the first slit and the second slit form a fan-shaped and continuous opening.

[0014] In some optional embodiments, the inner layer is made of elastic material, and / or the outer layer is made of rigid material.

[0015] In some optional embodiments, the elastic modulus of the elastic material is in the range of 0.5-20 GPa, and / or the elastic modulus of the rigid material is in the range of 200-250 GPa.

[0016] In some optional embodiments, the elastic material includes at least one of silicone, polyethylene, polypropylene, and polytetrachloroethylene; and / or the rigid material includes at least one of stainless steel, cobalt-based alloy, titanium alloy, and hard plastic.

[0017] In some optional embodiments, the thickness of the inner layer is in the range of 0.05-1 mm, and / or the thickness of the outer layer is in the range of 0.5-3 mm.

[0018] In some optional embodiments, the inner layer and the outer layer are connected by at least one of bonding, heat pressing or hot melting.

[0019] In some optional embodiments, an operating portion is provided at the proximal end of the inner layer, and the operating portion is arranged radially away from the first gap.

[0020] A second aspect of the present invention provides a fluid pumping device, comprising a fluid pumping conduit and a fluid blocking device according to any one of the first aspects, wherein the fluid blocking device is used in conjunction with the fluid pumping conduit.

[0021] The technical solution of the present invention has the following advantages or beneficial effects:

[0022] (1) The stiffness of the inner layer of the fluid sealing device of the present invention is lower than that of the outer layer, so that the fluid sealing device as a whole takes into account both flexibility and rigidity. The inner layer ensures the flexibility of the sealing device, thereby effectively blocking or sealing the fluid outlet and preventing the fluid from leaking from the fluid outlet; correspondingly, the outer layer has greater rigidity and is sleeved on the outside of the fluid outflow channel of the fluid pumping conduit, providing sufficient strength support for the fluid pumping conduit, effectively solving the problem of deformation of the outflow channel of the fluid pumping conduit due to excessive external force, and ensuring that after the fluid pumping conduit is inserted into the target position, it can stably achieve the pumping of the set target flow rate. The present invention can solve the problems of fluid leakage and deformation of the outflow channel in the prior art through a simple structural design, greatly reducing the difficulty and cost of designing and manufacturing the fluid sealing device.

[0023] (2) In the present invention, the first slit and the second slit are arranged relative to each other, especially when the second slit is projected onto the outer surface of the inner layer, the projection covers the first slit, so that the fluid blocking device can be separated from the fluid pumping catheter through the first slit and the second slit. When in use, the operator does not need to tear the blocking device with both hands to achieve separation from the fluid pumping catheter. On the contrary, the operator only needs to pull the fluid blocking device with one hand, that is, only one-handed single-step operation can make the fluid pumping catheter enter the first slit and the second slit to achieve the purpose of separation, which greatly reduces the difficulty of operating the device; and the blocking device has a simple structure and low manufacturing cost.

[0024] (3) The first slit and the second slit in the present invention have continuous openings, so that any slit of the fluid sealing device can be completed by cutting in one step during the manufacturing process, which simplifies the manufacturing process and saves production costs.

[0025] (4) In the present invention, an operating portion is provided at the proximal end of the inner layer, and the operating portion is used to drive the inner layer and the outer layer to deviate and allow the fluid pumping catheter to enter the first gap and the second gap, so that the operator can perform the removal operation with one hand, thereby improving the convenience of operation and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are provided for a better understanding of the present invention and are not intended to limit the present invention.

[0027] Figure 1 is a schematic diagram of an intervention state of a fluid pumping catheter according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the cooperation between a fluid pumping catheter and a guide wire according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the cooperation between a fluid pumping conduit and a fluid blocking device according to an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of a fluid blocking device according to a first embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of a fluid blocking device according to a second embodiment of the present invention;

[0032] Figure 6 a-6c is a schematic diagram of the fluid blocking device and the fluid pumping conduit being separated according to the first embodiment of the present invention;

[0033] Figure 7 a-7c is a schematic diagram of the fluid blocking device and the fluid pumping conduit separated according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0035] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0036] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0037] In the prior art, artificial ventricular assist devices are mainly used in high-risk PCI surgeries to provide patients with stable blood delivery support, reduce the burden on the heart, and reduce the risk of patients during surgery, which is beneficial to the patient's postoperative recovery. Among them, the main mechanism of the artificial ventricular assist device is a blood pumping catheter, which is provided with a blood inflow channel at the distal end and a blood outflow channel at the proximal end. Under normal working conditions, blood enters the blood pumping catheter through the distal inflow channel, flows toward the proximal end, and finally flows out from the proximal outflow channel. Among them, the proximal end and the distal end are relative to the operator, specifically the end close to the operator is the proximal end, and the end away from the operator is the distal end. However, during the process of the blood pumping catheter intervening in the human body, when the blood inflow channel enters the artery but the blood outflow channel does not enter, a large amount of blood will flow out of the outflow channel due to arterial high pressure. If the intervention process is not properly intervened, the problem of blood loss in the human body will occur. In addition, the blood pumping catheter achieves the purpose of intervention through a sheath; the sheath usually has a curved shape, and the blood vessels usually also have a large bending angle, which leads to a large resistance when the blood pumping catheter passes through the sheath and the blood vessels, so that the operator needs to apply a large force to pinch the outflow channel or the area near the outflow channel to slowly push the blood pumping catheter into the sheath. It is understandable that the large force applied by the operator will cause the outflow channel to twist and deform, resulting in a reduction in the flow area of ​​the outflow channel, resulting in insufficient blood pumping flow of the blood pumping catheter, and even aggravating problems such as blood cell damage. In order to solve the above problems, the conventional operation is to reduce the intervention time of the blood pumping catheter to reduce the amount of blood outflow, but this solution not only requires a high level of proficiency of the operator, but also still has the problem of large amounts of blood leakage. In addition, the prior art also discloses a solution of using special structural parts to reduce the flow area of ​​the outflow channel to reduce the amount of bleeding. However, the structure of the special structural member is complex, and it is necessary to tear the structural member apart with both hands to separate it from the blood pumping catheter, which makes the operation cumbersome. More seriously, the structural member is not strong enough to effectively protect the outflow channel, and it still cannot solve the problem of deformation of the outflow channel due to the large force applied by the operator.

[0038] To overcome at least one of the numerous problems in the related art, the present invention, in its first aspect, provides a fluid blocking device. The fluid blocking device is used in conjunction with a fluid pumping conduit, the fluid pumping conduit including at least one fluid outlet, and the fluid blocking device is configured to be sleeved onto the fluid pumping conduit. The fluid blocking device comprises an inner layer and an outer layer arranged in a nested manner. When the fluid blocking device is positioned at the fluid outlet, the inner layer covers the at least one fluid outlet. The outer layer has a greater rigidity than the inner layer.

[0039] like Figure 1As shown, the fluid pumping catheter 104 achieves the interventional purpose with the help of the catheter sheath 103. The distal end of the catheter sheath 103 extends from the punctured blood vessel 101 along the internal channel of the blood vessel into the human body. Figure 2 In the embodiment shown, the distal end of the fluid pumping catheter is provided with a fluid inflow channel 201, and the proximal end is provided with a fluid outflow channel 202. The fluid enters the interior of the fluid pumping catheter 104 through the inflow channel 201, and then flows out through the fluid outflow channel 202. In some embodiments, the fluid pumping catheter also needs to be inserted into the target position with the help of a guide wire 102. In actual use, the guide wire 102 enters the interior of the fluid pumping catheter through the outflow channel 202, and then extends into the interior of the blood vessel through the catheter sheath 103, and finally extends to the target position. Figure 1 As shown, when the fluid pumping catheter is inserted into the catheter sheath 103, the fluid will flow rapidly from the inlet channel to the outlet channel. In order to avoid or minimize the leakage of the fluid to the environment through the outflow channel, a fluid sealing device 105 is provided at the outflow channel in one embodiment of the present invention. The fluid sealing device 105 has a cylindrical geometric profile and can be used to be sleeved on the fluid pumping catheter. In some embodiments, the number of the outflow channels may be 1, 2, or more. Each outflow channel corresponds to a fluid outlet. In the assembled state, the fluid sealing device covers at least one of the fluid outlets to reduce the fluid flow area to reduce the amount of fluid leakage. Preferably, the fluid sealing device covers all the fluid outlets to minimize the amount of fluid leakage. As shown Figure 4In the illustrated embodiment, the fluid blocking device includes an inner layer 1052 and an outer layer 1051 that are nested. The inner layer 1052 is used to cover at least one of the fluid outlets, and the inner layer is in direct contact with the fluid to prevent leakage. Specifically, the covering purpose can be achieved by controlling the dimensional relationship between the inner layer and the fluid pumping conduit. For example, the inner diameter of the inner layer can be smaller than the outer diameter of the fluid pumping conduit, so that the two are in an interference fit relationship, and then the inner layer is tightly attached to the outer wall of the fluid pumping conduit in the assembled state. Furthermore, the stiffness of the outer layer 1051 is greater than the stiffness of the inner layer 1052. It should be noted that the stiffness of the inner layer 1052 is lower than that of the outer layer 1051. This arrangement allows the fluid blocking device to have both flexibility and rigidity as a whole. Specifically, the inner layer has sufficient flexibility to effectively block or seal the fluid outlet and prevent fluid from leaking from the fluid outlet. Correspondingly, the outer layer has greater rigidity and is sleeved on the outside of the fluid outflow channel of the fluid pumping conduit, providing sufficient strength support for the fluid pumping conduit, effectively solving the problem of deformation of the outflow channel of the fluid pumping conduit due to excessive external force, and ensuring that the fluid pumping conduit can achieve the set target flow rate after it is inserted into the target position. The present invention can solve the problems of fluid leakage and deformation of the outflow channel in the prior art through a simple structural design, greatly reducing the difficulty and cost of designing and manufacturing the blocking device. In some embodiments, the stiffness of the outer layer can be appropriately adjusted as needed to adapt to the usage habits of different operators. For example, the stiffness of the outer layer can be appropriately reduced under the premise of ensuring that the outflow channel is not deformed or slightly deformed. In this design, the load acting on the outer layer can be transferred to the inner layer, forcing the inner layer to deform to enhance its blocking effect on the fluid discharge port.

[0040] In some optional embodiments, the inner layer is provided with a first slit, the first slit extending from the proximal end surface of the inner layer to the distal end surface of the inner layer; the outer layer is provided with a second slit, the second slit extending from the proximal end surface of the outer layer to the distal end surface of the outer layer; the first slit and the second slit are arranged opposite to each other, so that the fluid sealing device is separated from the fluid pumping conduit through the first slit and the second slit. Figure 4In the illustrated embodiment, the inner layer 1052 and the outer layer 1051 both have a roughly C-shaped tubular structure, and the C-shaped notches on the inner and outer layers respectively constitute the first slit 1054 and the second slit 1053. The lengths of the first and second slits are equal to the axial lengths of the inner and outer layers, so that any cross-section of the inner and outer layers is not a complete closed circular ring shape. The first and second slits are arranged relative to each other, and in particular, when the second slit is projected onto the outer surface of the inner layer, the projection covers the first slit, so that the fluid blocking device can be separated from the fluid pumping conduit through the first and second slits. This allows the operator to separate the blocking device from the fluid pumping conduit without having to tear the blocking device with both hands during use. In contrast, the operator only needs to use one hand to pull the fluid blocking device so that the fluid pumping conduit enters the first and second slits to achieve the separation purpose. The structural design of the present invention greatly reduces the difficulty of operation. In addition, the blocking device in this embodiment has a simple structure and low manufacturing cost.

[0041] In some optional embodiments, the guide unit sequentially penetrates the inner layer and the fluid outlet through the first gap to enter the interior of the fluid pumping catheter. In some embodiments, during the intervention of the fluid pumping catheter, the fluid blocking device will slide along the axis of the fluid pumping catheter. At this time, the guide unit, such as the guide wire 102, needs to penetrate the fluid blocking device and can move relative to the fluid blocking device. To this end, Figure 1 and 4 In the embodiment shown, the first slit of the inner layer needs to accommodate the passage of the guidewire. In addition, the opening of the first slit cannot be too large to avoid the inner layer being unable to effectively cover the fluid outlet. In some embodiments, the width of the first slit abutting the surface of the fluid pumping catheter is preferably greater than or equal to the diameter of the guidewire, and less than the distance between the opposite edges of two adjacent fluid outlets. For example, the width of the first slit abutting the surface of the fluid pumping catheter is 0.7mm to 1.5mm. It should be noted that the width value of the first slit abutting the surface of the fluid pumping catheter here is only an example and does not constitute a limitation on the scope of protection of the present invention. In fact, the width of the first slit abutting the surface of the fluid pumping catheter can be reasonably selected based on parameters such as the diameter of the guidewire used, the number and diameter of the fluid outlets, etc.

[0042] In some optional embodiments, when the inner layer is in contact with the surface of the fluid pumping conduit, the circumferential distance between the portions of the first slit in contact with the fluid pumping conduit on either side of the first slit is equal to the minimum width of the first slit. The minimum width of the second slit is greater than the minimum width of the first slit, and / or the minimum width of the second slit is greater than or equal to the diameter of the fluid pumping conduit. It will be understood that the overall shape of the inner and outer layers is annular, and the widths of the first and second slits formed along the inner and outer layers can be a series of linearly varying width values ​​or a series of nonlinearly varying width values. To facilitate separation of the fluid sealing device from the fluid pumping conduit, in some embodiments of the present invention, the minimum width of the second slit is greater than the minimum width of the first slit. Specifically, when the fluid sealing device is mounted on the fluid pumping conduit to cover the fluid outlet, and the inner layer is in contact with the surface of the fluid pumping conduit, the circumferential distance between the portions of the first slit in contact with the fluid pumping conduit on either side of the first slit is equal to the minimum width of the first slit. It is understood that the minimum width of the first gap is obtained by the arc distance in the circumferential direction of the parts on both sides of the first gap that are in contact with the surface of the fluid pumping conduit after the fluid sealing device is installed and the external force applied to the fluid sealing device is removed. Figure 4Taking the first slit as an example, the portion of the first slit abutting the fluid pumping catheter is defined as two parallel lines on the left and right. The arc distance (or arc length) between these two parallel lines in the circumferential direction is the minimum width of the first slit. Similarly, under the same conditions, the minimum width of the second slit is the arc distance between the portions of the second slit abutting the inner layer on either side of the slit in the circumferential direction. Because the inner layer near the first slit has a lower stiffness, during the separation process, the inner layer at the first slit can enter or exit the second slit under the action of external force, thereby facilitating the fluid pumping catheter's sequential entry into the first and second slits, achieving separation. In other embodiments, the minimum width of the second slit is set to be greater than or equal to the diameter of the fluid pumping catheter to facilitate entry of the fluid pumping catheter into the first and second slits, achieving separation. It is understood that even if the minimum width of the second slit is smaller than the outer diameter of the ex vivo pumping catheter, an operator can still force the fluid pumping catheter into the first and second slits, achieving separation, by applying a significant external force. However, due to the greater rigidity of the outer layer, the operator typically needs to apply a significant force to the occlusion device to achieve separation. This significant force can make the device inconvenient to use and can also cause deformation of the fluid pumping catheter, creating additional risks. To this end, in some embodiments, the minimum width of the second slit is preferably set to be greater than the diameter of the fluid pumping catheter. In some embodiments, the proximal end of the fluid pumping catheter has multiple diameters, i.e., a variable diameter structure. In this case, the minimum width of the second slit can be greater than or equal to the smallest or largest of the multiple diameters, or any other diameter. Of course, to facilitate separation, the minimum width of the second slit is preferably greater than or equal to the maximum diameter. To ensure that the fluid outlet does not deform, the minimum width of the second slit is preferably greater than or equal to the minimum diameter. In some embodiments, the minimum width of the second slit can range from 3.5 mm to 5 mm. It should be noted that these dimensions are merely examples and do not limit the scope of the present invention. In other embodiments, the first and second slits form a fan-shaped, continuous opening. In this embodiment, the first and second slits have continuous openings, allowing each slit of the fluid sealing device to be cut in a single step during manufacturing, simplifying the manufacturing process and reducing production costs. In practice, because both the inner and outer layers have a certain thickness, the first and second slits exhibit a fan-shaped shape when viewed along the axis. In other embodiments, the sidewalls of the first and / or second slits may be flat, curved, or a combination thereof to form a continuous opening.

[0043] In some optional embodiments, the inner layer and the outer layer are connected by at least one of bonding, thermal pressing or hot melting. Figure 4 In the illustrated embodiment, both the inner and outer layers are tubular structures. To ensure that the inner and outer layers can be synchronously separated from the fluid pumping catheter and improve the operating efficiency of the device, the inner and outer layers need to be stably connected. To this end, in some embodiments of the present invention, the two layers are secured together by bonding, thermal compression, or hot melting. For example, adhesive can be evenly applied to the outer wall of the inner layer and / or the inner wall of the outer layer before the two layers are bonded together.

[0044] In some optional embodiments, the proximal end of the inner layer is provided with an operating portion, and the operating portion is arranged away from the first gap. Furthermore, when separating, the operating portion is used to drive the inner layer and the outer layer to deviate and allow the fluid pumping catheter to enter the first gap and the second gap. Figure 5 In the illustrated embodiment, an operating portion 5053 is provided at the proximal end of the inner layer, and the operating portion 5053 is provided on the side away from the first and second gaps. Furthermore, the operating portion includes an ergonomic design that can match the contours of human fingers for easier gripping. For example, the side of the operating portion close to the axis of the fluid blocking device has a curved surface to match the contours of the operator's thumb. In other embodiments, the side of the operating portion away from the axis is provided with a curved surface that matches the operator's index finger. During separation, the operator can pinch the two sides of the operating portion with the thumb and index finger to pull the fluid blocking device toward the side away from the fluid pumping conduit, thereby allowing the fluid pumping conduit to enter the first and second gaps in sequence, achieving the purpose of separation force. In some embodiments, the operating portion can be integrally formed with the inner layer, thereby increasing the connection strength between the inner layer and the operating portion and reducing the difficulty of manufacturing the fluid blocking device. The operating portion can be made of the same material as the inner layer. Of course, the operating portion can also be made of a material different from the inner layer. For example, the operating portion is made of a material with greater structural strength. Figure 5 The geometric shape of the operating portion shown is only an example and does not limit the scope of protection of the present invention. For example, in some embodiments, a pull ring or other structure can be further provided on the operating portion to further facilitate the use of the operator.

[0045] In some optional embodiments, the inner layer is made of an elastic material, such as a polymer, and / or the outer layer is made of a rigid material, such as a metal. The rigid material refers to a material whose deformation under external force is minimal or negligible. Preferably, the elastic modulus of the elastic material is in the range of 0.5-20 GPa, and / or the elastic modulus of the rigid material is in the range of 200-250 GPa. It should be noted that the above values ​​or ranges are merely examples and can be adjusted as needed. Furthermore, the elastic material includes at least one of silicone, polyethylene, polypropylene, and polytetrachloroethylene; and / or the rigid material includes at least one of stainless steel, a cobalt-based alloy, a titanium alloy, and a rigid plastic. The main purpose of the inner layer is to seal the fluid outlet, so the material used to make the inner layer needs to be sufficiently flexible to fit tightly against the outlet. To this end, the inner layer is preferably made of a polymer. To ensure that the outer layer has sufficient strength and rigidity to resist deformation under external forces, it is preferably made of a metal material.

[0046] A second aspect of the present invention provides a fluid pumping device, comprising a fluid pumping conduit and a fluid blocking device according to any one of the first aspects, wherein the fluid blocking device is used in conjunction with the fluid pumping conduit.

[0047] In an optional embodiment, during the intervention process, the fluid blocking device covers at least one of the fluid outlets and can slide proximally along the surface of the fluid pumping catheter. Figure 1 、 Figure 6 and Figure 7 In the example shown, during intervention, the operator at least partially grasps the fluid blocking device and pushes the fluid pumping catheter forward along the inner channel of the catheter sheath. When the distal end of the fluid blocking device abuts against the proximal surface 106 of the catheter sheath and the operator continues to push the fluid pumping catheter forward, the fluid blocking device will gradually slide back along the surface of the fluid pumping catheter due to the resistance of the proximal surface 106, and eventually detach from the fluid outlet (e.g., Figure 6 b or Figure 7 b). At this time, the fluid outlet has completely entered the catheter sheath and the structure of the catheter sheath prevents the fluid from leaking into the environment. At this time, the operator can adjust the blocking device to the appropriate position of the fluid pumping catheter and pull the fluid blocking device, or pull the fluid pumping catheter and the fluid blocking device at the same time to separate the two (as shown in FIG. Figure 6 c or Figure 7 c).

[0048] The above specific embodiments do not constitute a limitation on the scope of protection of the present invention. After considering the specification and practicing the technical solutions disclosed in this application, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in this disclosure. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0049] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fluid blocking device for use with a fluid pumping conduit, wherein the fluid pumping conduit includes at least one fluid discharge port, characterized in that: The fluid blocking device is used to be sleeved on the fluid pumping conduit; The fluid blocking device comprises an inner layer and an outer layer which are nested. When the fluid blocking device is located at the fluid outlet, the inner layer covers at least one of the fluid outlets. The outer layer has a stiffness greater than that of the inner layer; The inner layer is provided with a first slit, and the first slit extends from the proximal end surface of the inner layer to the distal end surface of the inner layer; The outer layer is provided with a second slit, and the second slit extends from the proximal end surface of the outer layer to the distal end surface of the outer layer; The first gap and the second gap are arranged opposite to each other.

2. The fluid blocking device according to claim 1, characterized in that: When the inner layer is in contact with the surface of the fluid pumping conduit, the arc distance in the circumferential direction between the portions on both sides of the first slit that are in contact with the surface of the fluid pumping conduit is the minimum width of the first slit.

3. The fluid blocking device according to claim 2, characterized in that: The minimum width of the second slit is greater than the minimum width of the first slit, and / or the minimum width of the second slit is greater than or equal to the diameter of the fluid pumping conduit.

4. The fluid blocking device according to claim 1, characterized in that: The first slit and the second slit form a fan-shaped and continuous opening.

5. The fluid blocking device according to claim 1, characterized in that: The inner layer is made of elastic material, and / or the outer layer is made of rigid material.

6. The fluid blocking device according to claim 5, characterized in that: The elastic modulus of the elastic material is in the range of 0.5-20 GPa, and / or the elastic modulus of the rigid material is in the range of 200-250 GPa.

7. The fluid blocking device according to claim 5, characterized in that: The elastic material includes at least one of silicone, polyethylene, polypropylene, and polytetrachloroethylene; and / or the rigid material includes at least one of stainless steel, cobalt-based alloy, titanium alloy, and hard plastic.

8. The fluid blocking device according to claim 1, characterized in that: The thickness of the inner layer is in the range of 0.05-1 mm, and / or the thickness of the outer layer is in the range of 0.5-3 mm.

9. The fluid blocking device according to claim 1, characterized in that: The inner layer and the outer layer are connected by at least one of bonding, thermal pressing or hot melting.

10. The fluid blocking device according to claim 1, characterized in that: An operating portion is provided at the proximal end of the inner layer, and the operating portion is arranged radially away from the first slit.

11. A fluid pumping device, characterized in that: The invention comprises a fluid pumping conduit and the fluid blocking device according to any one of claims 1 to 10, wherein the fluid blocking device is used in conjunction with the fluid pumping conduit.

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