Catheter, push tube and flow directing structure

Abstract

The utility model relates to the extracorporeal circulation system technical field discloses a kind of conduit, push pipe and flow guide structure, wherein conduit, it is inside provided with lumen, hole is opened on its lateral wall with lumen communication;Connecting portion is set in the proximal end of the pipe body, the connecting portion is provided with the through hole that is communicated with the lumen, the through hole can make push pipe pass through;Hardening portion is set in the distal end of the pipe body, the hardening portion is adapted to abut with the push pipe inserted into the lumen, and under the impetus of push pipe, pipe body and connecting portion are moved.The hardening portion of the utility model conduit distal end is additionally provided with, and the problem that weak area is caused due to the hole opening of conduit distal end portion is made up.The setting of hardening portion enhances the structural stability of conduit in push process, prevents the deformation or rupture of conduit due to the insertion of push pipe.

Description

Technical Field

[0001] This utility model relates to the field of extracorporeal circulation systems, specifically to a catheter, a push tube, and a flow guiding structure. Background Technology

[0002] Extracorporeal circulation (ECG) is a technique used during cardiac surgery to temporarily replace heart and lung function. Intravenous and arterial cannulation are used in ECG procedures. Current ECG cannulas include catheters and guide tubes. The catheter has multiple openings in its sidewall for blood aspiration. Because the catheter is relatively soft and blood vessels are often tortuous, guide wires alone cannot easily insert the catheter into place. Therefore, when inserting the catheter into a blood vessel, a guide tube must be inserted inside the catheter to move the catheter to the target location.

[0003] Because the catheter is relatively soft and lacks strength, when the push tube is inserted into the catheter, the contact interface between the distal end of the push tube and the inner wall of the catheter cannot form effective support. This causes the push tube to be unable to stably support the catheter, and the distal end of the catheter and the distal end of the push tube are prone to sliding and displacement, which is not conducive to the advancement of the catheter. Furthermore, because the catheter is relatively soft, the distal end of the catheter is prone to breakage when the push tube pushes the catheter. Utility Model Content

[0004] In view of this, the present invention provides a catheter, a push tube, and a flow guiding structure to solve the problem that the distal end of the catheter is prone to breakage.

[0005] In a first aspect, this utility model provides a catheter, comprising:

[0006] The tube body has a cavity inside and holes on its side wall that communicate with the cavity.

[0007] A hardened section is disposed at the distal end of the tube body. The hardened section is adapted to abut against the push tube inserted into the lumen and to drive the tube body and the connecting section to move under the push of the push tube.

[0008] The beneficial effects of the aforementioned catheter are as follows: the hardened portion added to the distal end of the catheter does not have any holes, and the hardened portion enhances the local material strength or structural thickness, compensating for the weakness in the area caused by holes in the distal end of the catheter. The hardened portion enhances the structural stability of the catheter during insertion, preventing deformation or breakage due to the insertion of the push tube. When the push tube is inserted and pushes the hardened portion, the hardened portion can withstand greater thrust, avoiding breakage at the distal end of the catheter due to stress concentration. This is particularly suitable for scenarios with tortuous blood vessels or high operational resistance, significantly improving the reliability and safety of the catheter.

[0009] The rigidity of the hardened portion provides a stable mechanical support interface for the distal end of the delivery tube, allowing the axial thrust of the delivery tube to be transmitted more evenly to the distal end of the catheter. This avoids stress concentration at point contact and inter-tube slippage caused by deformation of the soft tube wall, significantly improving the stability of the delivery process. The design of the hardened portion directly contacting the delivery tube ensures that the delivery force is transmitted to the entire catheter through the more rigid hardened portion, rather than relying solely on the flexible distal tube wall. This reduces catheter deformation or wrinkling during delivery, ensuring stable advancement of the tube along the vascular path, thereby reducing frictional damage to the vascular wall and facilitating proper catheter insertion.

[0010] This invention directly reduces the incidence of intraoperative complications by lowering the risk of catheter rupture and reducing the possibility of vascular damage. It can also shorten the operation time, reduce the physiological burden on patients, and improve postoperative recovery.

[0011] In one alternative embodiment, the proximal wall of the hardened portion is adapted to abut against the push tube, forming a stable and efficient mechanical contact surface with the push tube, so that the catheter can move more smoothly to the target position under the action of the push tube.

[0012] In one optional embodiment, the proximal wall of the hardened portion is a plane perpendicular to the central axis of the lumen. The distal face of the push tube is a plane perpendicular to the central axis of the lumen, so that when the push tube pushes the catheter to extend, the catheter can extend completely along its axis, thereby ensuring the accuracy and stability of the pushing process and avoiding possible deviation or twisting of the catheter during the pushing process.

[0013] In one optional embodiment, the hardening part has an opening inside, the opening penetrates the hardening part and communicates with the lumen, and the inner diameter of the opening is smaller than the inner diameter of the lumen, so that the push tube is housed inside the lumen when it abuts against the proximal wall of the hardening part.

[0014] The beneficial effects of the above technical solution are: by completely embedding the distal end of the push tube inside the catheter, it is possible to avoid setting the distal end of the push tube in a pointed cone shape and extending it out of the catheter, thereby avoiding damage to the blood vessel when the entire device is inserted into the blood vessel.

[0015] In one alternative embodiment, the central axis of the opening is parallel to the central axis of the lumen.

[0016] In one optional embodiment, the hardened portion is divided into a first hardened portion and a second hardened portion from the distal end to the proximal end; the first hardened portion is a single-layer elastic tube, and / or the second hardened portion is a multi-layer hardened tube and includes at least one first reinforcing layer.

[0017] The beneficial effects of the above technical solution are as follows: the first reinforcing layer has excellent mechanical properties and stability, which can effectively improve the overall strength and rigidity of the second hardened part and prevent deformation or damage due to external forces during use. The outer polymer layer can provide a certain degree of elasticity and flexibility, making the catheter easier to insert into blood vessels and reducing damage to blood vessels.

[0018] In one optional embodiment, the second hardened portion includes an inner polymer layer, a first reinforcing layer, and an outer polymer layer, which are arranged sequentially from the inside to the outside.

[0019] In one optional embodiment, the proximal end of the tube body is provided with a connecting portion, and the connecting portion is provided with a through hole communicating with the tube cavity, the through hole allowing the push tube to pass through.

[0020] In one alternative embodiment, the connecting part is a multi-layer tube and includes at least one second reinforcing layer.

[0021] In one optional embodiment, the connecting part includes an inner connecting tube, a second reinforcing layer, and an outer connecting tube, which are arranged sequentially from the inside to the outside.

[0022] The beneficial effects of the above technical solution are as follows: the design of the connector provides stronger and more stable connection between the catheter and the hardened part. The polymer material of the outer tube of the connector has good elasticity and biocompatibility, ensuring that the catheter will not cause additional damage to the blood vessel when inserted. The reinforcement effect of the second reinforcing layer allows the connector to withstand greater external forces, preventing breakage or damage due to external forces during use.

[0023] In one alternative embodiment, the outer diameter of the hardened portion gradually decreases from the proximal end to the distal end.

[0024] In one optional embodiment, the tube body is divided into a first tube body and a second tube body from the proximal end to the distal end, and the second tube body is transitionally connected to the hardened part.

[0025] The beneficial effects of the above technical solution are: the transition between the second tube body and the hardened part avoids the increase in resistance of the conduit during use due to the sudden change in the cross-sectional diameter of the hardened part 11.

[0026] In one alternative embodiment, the outer diameter of the second tube body and the hardened part gradually decreases from the proximal end to the distal end, which facilitates the smooth pushing and precise positioning of the catheter in the blood vessel. This not only reduces the resistance during the pushing process of the catheter, but also helps the doctor to more accurately control the position of the catheter during the operation.

[0027] In one alternative embodiment, the connection between the distal end face of the hardened portion and the sidewall is configured as an arc-shaped transition section, making the distal end of the hardened portion rounded, thereby avoiding scratching the blood vessel when it comes into contact with the inner wall of the blood vessel.

[0028] In one alternative embodiment, the tube is a wound component, a mesh braided component, a tubular cut component, or a carved component.

[0029] In one optional embodiment, the tube body is an elastic telescopic member; when the push tube abuts against the hardened part, the axial length of the tube body extends and the radial length of the tube body shortens; when the push tube disengages from the hardened part, the axial length of the tube body shortens and the radial length of the tube body extends.

[0030] In one alternative embodiment, the axial expansion ratio of the tube is 1.5:1 to 2:1, and the radial expansion ratio of the tube is 1.4:1 to 1.8:1.

[0031] In one alternative embodiment, the wall thickness of the connecting portion is the same or gradually increases from the distal end to the proximal end.

[0032] Secondly, this utility model also provides a push tube, which is adapted to the conduit.

[0033] In one alternative embodiment, the distal wall of the push tube is configured to be planar and perpendicular to its central axis.

[0034] In one alternative embodiment, an elastic material layer is provided on the distal wall of the push tube.

[0035] The beneficial effects of the above technical solution are: the elastic material layer can play a buffering role, reduce the impact force on the catheter when the push tube is inserted into the catheter, and further reduce the risk of the catheter breaking during the push process.

[0036] Thirdly, this utility model also provides a flow guiding structure, including:

[0037] catheter;

[0038] A push tube, which can be inserted into the conduit;

[0039] A positioning structure is provided at the proximal end of the catheter and the proximal end of the delivery tube; the positioning structure has a locked position and an unlocked position. When the positioning structure is in the locked position, the delivery tube is positioned inside the catheter and can be delivered synchronously. When the positioning structure is in the unlocked position, the delivery tube and the catheter are separated from each other.

[0040] In one alternative embodiment, the outer diameter of the proximal wall of the hardened portion in the conduit is not less than the outer diameter of the push tube, and the outer diameter of the push tube is greater than the inner diameter of the opening.

[0041] The beneficial effects of the above technical solution are as follows: when the push tube is inserted into the catheter, the distal end of the push tube will not protrude from the catheter. Therefore, during use, the push tube will not cause additional damage to the patient's tissues, improving the safety and reliability of the surgery. Furthermore, the rounded tip of the distal end of the sclerotic portion ensures that when the catheter moves within the blood vessel, only the rounded tip contacts the vessel wall, reducing the risk of catheter damage to the vessel wall.

[0042] In one alternative embodiment, when the conduit is not elongated, the axial length ratio of the conduit to the push tube is 1:1.5 to 2. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the structure of the catheter provided by this utility model;

[0045] Figure 2 A schematic diagram of the structure of the catheter provided by this utility model;

[0046] Figure 3 The catheter provided by this utility model Figure 2 Enlarged view of part B;

[0047] Figure 4 This utility model Figure 3 Sectional view along line AA in the middle;

[0048] Figure 5 A schematic diagram of the push tube provided by this utility model;

[0049] Figure 6 A schematic diagram of the positioning tube in the flow guiding structure provided by this utility model;

[0050] Figure 7 A side view of the positioning tube in the flow guiding structure provided by this utility model;

[0051] Figure 8 A schematic diagram of the structure when the push tube is connected to the positioning tube according to this utility model;

[0052] Figure 9 This is a schematic diagram of the conduit in the flow guiding structure provided by this utility model after stretching.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Conduit; 11. Hardened section; 111. Opening; 112. First hardened section; 113. Second hardened section; 12. Tube body; 121. Hole; 122. First tube body; 123. Second tube body; 13. Connecting section; 131. Second reinforcing layer; 132. Inner tube of connecting section; 133. Outer tube of connecting section; 114. Proximal wall of hardened section;

[0055] 2. Push tube; 21. Elastic material layer;

[0056] 3. Positioning structure, 31. Positioning tube, 311. Through hole, 312. Slide groove, 32. Positioning seat, 322. Positioning protrusion. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0058] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "distal" generally refers to the end of the medical implant furthest from the operator; "proximal," the opposite of "distal," refers to the end of the medical implant closer to the operator; the term "distal surface" refers to the surface located at the distal end; the term "distal end portion" refers to the location located at the distal end; the term "proximal wall" refers to the side wall near the proximal end; the term "radial" refers to the direction perpendicular to the axis of the medical implant; and the term "axial" refers to the direction coaxial with the axis of the medical implant. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0059] The specific embodiments of this utility model are described in detail below with reference to the conduit of the first aspect of this utility model, the push tube of the second aspect of this utility model, and the flow guiding structure of the third aspect of this utility model.

[0060] Example 1

[0061] Combination Figures 1 to 4As shown, according to an embodiment of the present invention, in a first aspect, a conduit is provided, including a tube body 12, a connecting portion 13, and a hardening portion 11. The tube body 12 has an internal cavity, and its sidewall has multiple holes 121 communicating with the cavity. The connecting portion 13 is located at the proximal end of the tube body, and has a through hole communicating with the cavity, allowing a push tube 2 to pass through. The hardening portion 11 is located at the distal end of the tube body, and the material hardness of the hardening portion 11 is greater than that of the tube body 12. The hardening portion 11 is adapted to abut against the push tube 2 inserted into the cavity, and under the push of the push tube 2, it drives the tube body and the connecting portion 13 to move.

[0062] In this embodiment, the hardened portion 11 added to the distal end of the catheter does not have any holes. The hardened portion 11 enhances the local material strength or structural thickness, compensating for the weakness in the area caused by the hole 121 at the distal end of the catheter. The hardened portion 11 enhances the structural stability of the catheter 1 during insertion, preventing deformation or breakage of the catheter 1 due to the insertion of the push tube 2. When the push tube 2 is inserted and pushes the hardened portion 11, the hardened portion 11 can withstand greater thrust, preventing breakage of the distal end of the tube 12 due to stress concentration. This is particularly suitable for scenarios with tortuous blood vessels or high operational resistance, significantly improving the reliability and safety of the catheter.

[0063] The rigidity of the hardened portion 11 provides a stable mechanical support interface for the distal end of the delivery tube, allowing the axial thrust of the delivery tube to be transmitted more evenly to the distal end of the catheter. This avoids stress concentration at point contact and inter-tube sliding displacement caused by deformation of the soft tube wall, significantly improving the stability of the delivery process. The design of the hardened portion 11 directly contacting the delivery tube 2 allows the delivery force to be transmitted to the entire catheter through the more rigid hardened portion, rather than relying solely on the flexible distal tube wall. This reduces catheter deformation or wrinkling during delivery, ensuring stable advancement of the tube along the vascular path, thereby reducing frictional damage to the vascular wall and ensuring proper catheter insertion.

[0064] This embodiment directly reduces the incidence of intraoperative complications by lowering the risk of catheter rupture and reducing the possibility of vascular damage. It can shorten the operation time, reduce the physiological burden on patients, and improve postoperative recovery.

[0065] Furthermore, the hardened portion 11 has a certain length along the axial direction. For example, the axial length of the hardened portion 11 is set to 10mm to 30mm, so that the hardened portion 11 can effectively increase the hardness of the distal end of the tube body 12 and improve the anti-rupture performance, and the flexibility of the conduit during use will not be reduced due to the excessive length of the hardened portion 11.

[0066] In some embodiments, the proximal wall 114 of the hardened portion is adapted to abut against the push tube 2, forming a stable and efficient mechanical contact surface with the push tube 2, so that the catheter can move more smoothly to the target position under the action of the push tube.

[0067] In some embodiments, the proximal wall 114 of the hardened portion is a plane perpendicular to the central axis of the lumen. The distal surface of the push tube is also a plane perpendicular to the central axis of the lumen. Therefore, when the push tube 2 pushes the catheter 1 to extend, the catheter 1 can extend completely along its axis, thus ensuring the accuracy and stability of the pushing process and preventing possible deviation or twisting of the catheter during pushing. Furthermore, the plane of the proximal wall 114 of the hardened portion contacts the distal surface of the push tube, increasing the contact area, dispersing the pushing force, and further reducing the risk of rupture at the distal end of the catheter during pushing.

[0068] Currently, in order for catheter 1 to be inserted into a blood vessel, a push tube 2 needs to extend from the distal end of catheter 1. The distal end of push tube 2 is often designed as a pointed cone. However, when push tube 2 and catheter 1 move within the blood vessel, the distal end of push tube 2 can scratch the blood vessel. To solve this problem, in some embodiments, the hardened portion 11 has an opening 111 inside. The opening 111 penetrates the hardened portion 11 and communicates with the lumen of the second tube body 123. The inner diameter of the opening 111 is smaller than the inner diameter of the lumen of the second tube body 123, so that a limiting step is formed between the second tube body 123 and the hardened portion 11. When push tube 2 abuts against the proximal wall 114 of the hardened portion, it is contained inside the lumen. The outer diameter of the distal end of push tube 2 is larger than the inner diameter of opening 111, and the outer diameter of the distal end of push tube 2 is smaller than the inner diameter of the second tube body 123. Therefore, when push tube 2 is inserted into catheter 1, it is limited by the limiting step 14.

[0069] In this embodiment, the distal end of the push tube 2 is completely embedded inside the catheter 1, thereby avoiding the situation where the distal end of the push tube 2 is set as a pointed cone and extends out of the catheter 1, thus preventing damage to the blood vessel when the device is inserted into the blood vessel.

[0070] In some embodiments, the central axis of the opening 111 is parallel to the central axis of the lumen. More specifically, the central axis of the opening 111 is collinear with the central axis of the lumen, which ensures that the guide wire can be smoothly inserted into the opening 111 along the lumen.

[0071] In some embodiments, the hardening portion 11 is divided into a first hardening portion 112 and a second hardening portion 113 from the distal end to the proximal end. The first hardening portion 112 is a single-layer elastic tube; and / or, the second hardening portion 113 is a multi-layer hardening tube and includes at least one first reinforcing layer, which can prevent deformation after the push tube 2 is inserted, thus avoiding affecting its normal use.

[0072] In one specific embodiment, the second hardened portion 113 can be a three-layer tube, consisting of an inner polymer layer, a first reinforcing layer, and an outer polymer layer from the inside out. The inner polymer layer can be filled with polymer material or injection molded material. The first reinforcing layer is a metal reinforcing layer, which has excellent mechanical properties and stability, effectively improving the overall strength and rigidity of the second hardened portion 113 and preventing deformation or damage due to external forces during use. The outer polymer layer provides a certain degree of elasticity and flexibility, making the catheter easier to insert into blood vessels and reducing damage to the blood vessels.

[0073] In some embodiments, the connecting portion 13 is a multilayer tube and includes at least one second reinforcing layer 131. In one specific embodiment, combined with Figure 4 As shown, the connecting part 13 consists of three layers, from the inside out: an inner connecting tube 132, a second reinforcing layer 131, and an outer connecting tube 133. The inner connecting tube 132 can be made of a polymer material (TPU, PEBAX, nylon, silicone, or other materials with equivalent properties). The second reinforcing layer 131 can be made of round, flat, or other shaped wires from Niti or stainless steel and other materials, through weaving and spring winding, or it can be achieved by cutting patterns from Niti or stainless steel hyaluronic acid tubing. The outer connecting tube 133 is made of a polymer material.

[0074] In this embodiment, the design of the connecting portion 13 provides stronger and more stable connection between the catheter push tube 2 and the hardened portion 11. The polymer material of the outer tube 133 of the connecting portion has good elasticity and biocompatibility, ensuring that the catheter will not cause additional damage to the blood vessel when inserted. The reinforcing effect of the second reinforcing layer 131 allows the connecting portion 13 to withstand greater external forces, preventing breakage or damage during use. Furthermore, the material and manufacturing process of the second reinforcing layer 131, such as braiding, spring coiling, or pattern cutting, can be adjusted according to actual needs to meet the requirements of different medical scenarios.

[0075] In some embodiments, the tube 12 is divided into a first tube 122 and a second tube 123 from the proximal end to the distal end. The second tube 123 is transitionally connected to the hardened part 11, which avoids the increase in resistance of the catheter during use due to the sudden change in the cross-sectional diameter of the hardened part 11.

[0076] In some embodiments, the outer diameter of the second tube body 123 and the hardened part 11 gradually decreases from the proximal end to the distal end, which facilitates the smooth pushing and precise positioning of the catheter in the blood vessel. This not only reduces the resistance during the pushing process of the catheter, but also helps the doctor to more accurately control the position of the catheter during the operation.

[0077] In some embodiments, the connection between the distal end face of the hardened portion 11 and the sidewall is provided as an arc-shaped transition section, so that the distal end of the hardened portion 11 has a rounded head, thereby avoiding scratching the blood vessel when it comes into contact with the inner wall of the blood vessel.

[0078] In some embodiments, the tube 12 is a wound component, a mesh-braided component, a tubular cut component, or a sculpted component. The wound component is a metal wound tube with good elasticity and plasticity, capable of adapting to blood vessels of different shapes. The mesh-braided component is woven from nickel-titanium alloy wire or biocompatible materials to form a tubular structure with multiple pores. The tubular cut component can be achieved by cutting patterns using Niti or stainless steel thiocyanate tubing. The sculpted component uses precision engraving technology to carve micro-pores onto the surface of the tube.

[0079] In some embodiments, the tube body 12 is an elastic telescopic member. When the push tube 2 abuts against the hardened part 11, the axial length of the tube body 12 extends and the radial length of the tube body 12 shortens; when the push tube 2 disengages from the hardened part 11, the axial length of the tube body 12 shortens and the radial length of the tube body 12 extends.

[0080] In this embodiment, the catheter can more flexibly adapt to the shape of the blood vessel during insertion, reducing resistance and damage to the vessel. Simultaneously, after the insertion tube disengages from the hardened portion, the tube body can return to its original shape, maintaining stable support and ensuring the accuracy and safety of the medical procedure.

[0081] In some embodiments, the expansion ratio of the tube body 12 is 1.5:1 to 2:1. The radial expansion ratio of the tube body 12 is 1.4:1 to 1.8:1.

[0082] In some embodiments, the wall thickness of the connecting portion 13 is the same from the distal end to the proximal end, which facilitates processing and production.

[0083] As an alternative embodiment, the wall thickness of the connecting portion 13 gradually increases from the distal end to the proximal end. This design can significantly improve the compressive strength of the proximal end. Since the proximal end usually bears greater external forces (such as connection, fixation, etc.), the thickened wall thickness can better resist external pressure and prevent the tube body from cracking or deforming.

[0084] Example 2

[0085] Combination Figure 5 As shown, according to an embodiment of the present invention, in a second aspect, a push tube is provided, wherein the push tube 2 and the conduit 1 are adapted to each other.

[0086] The distal wall of the push tube 2 is planar and perpendicular to its central axis. The proximal wall 114 of the hardened portion is a plane perpendicular to the central axis of the lumen. Therefore, when the push tube 2 pushes the catheter 1 to extend, the catheter 1 can extend completely along its axis, thus ensuring the accuracy and stability of the push process and preventing possible deviation or twisting of the catheter during push. Furthermore, the proximal wall 114 of the hardened portion contacts the plane of the distal end of the push tube, increasing the contact area, dispersing the push force, and further reducing the risk of rupture at the distal end of the catheter during push.

[0087] If the insertion speed or force of the push tube 2 is too high when it is inserted into the catheter 1, the distal end of the push tube 2 may break. To solve this problem, in this embodiment, the distal wall of the push tube 2 is provided with an elastic material layer. The elastic material layer 21 can be made of silicone, rubber or other soft materials with similar properties. The elastic material layer has a certain degree of softness and elasticity, and can play a buffering role, reducing the impact force on the catheter 1 when the push tube 2 is inserted into the catheter 1, and further reducing the risk of the catheter 1 breaking during the push process.

[0088] Example 3

[0089] Combination Figures 1 to 9 As shown, according to an embodiment of the present invention, in a third aspect, a flow guiding structure is provided. This flow guiding structure is a blood flow guiding structure applied to an extracorporeal circulation system, establishing a temporary extracorporeal circulation path in a specific surgical scenario. The flow guiding structure includes a positioning structure 3, a catheter 1 as described in Embodiment 1, and a push tube 2 as described in Embodiment 2. The push tube 2 can be inserted into the catheter 1.

[0090] In some embodiments, the outer diameter of the proximal wall 114 of the sclerotic portion in catheter 1 is not less than the outer diameter of the push tube 2. The outer diameter of the push tube 2 is larger than the inner diameter of the opening 111. When the push tube 2 is inserted into the catheter 1, the distal end of the push tube 2 does not protrude from the catheter 1. Therefore, during use, the push tube 2 will not cause additional damage to the patient's tissues, improving the safety and reliability of the procedure. Furthermore, the distal end of the sclerotic portion 11 is rounded, so when the catheter 1 moves within the blood vessel, only the rounded tip contacts the vessel wall, reducing the risk of damage to the vessel wall.

[0091] In some embodiments, when the catheter 1 is not elongated, the axial length ratio of the catheter 1 to the push tube 2 is 1:1.5 to 2.

[0092] In some embodiments, the positioning structure 3 is disposed at the proximal end of the catheter 1 and the proximal end of the push tube 2. The positioning structure 3 has a locked position and an unlocked position. When the positioning structure 3 is in the locked position, the push tube 2 is positioned inside the catheter 1 and can be synchronously delivered. When the positioning structure 3 is in the unlocked position, the push tube 2 and the catheter 1 are separated from each other.

[0093] More specifically, the positioning structure 3 includes a positioning tube 31 and a positioning seat 32. The positioning tube 31 is provided with a through hole 311 that communicates with the guide tube 1, and a sliding groove 312 is provided on the through hole 311. The positioning seat 32 is provided with a positioning protrusion 322.

[0094] During operation, the push tube 2 is inserted into the conduit 1, with its distal end abutting against the proximal wall 114 of the hardened portion. The axes of the push tube 2 and the conduit 1 are coaxial. The positioning seat 32 is pushed, propelling the conduit 1 distally and stretching the entire conduit 1, causing its overall outer diameter to decrease, and the conduit 1 to fit tightly against the push tube 2. The positioning protrusion 322 enters the through hole 311 from the position of the groove 312. Rotating the positioning seat 32 causes the push tube 2 and the positioning protrusion 322 to rotate, misaligning the positioning protrusion 322 with the groove 312, thereby achieving a locking connection between the push tube 2 and the conduit 1. A guide wire is inserted into the device, and the device is transported to the target position via the guide wire.

[0095] Upon reaching the target area, rotate the positioning seat 32 so that the positioning protrusion 322 aligns with the sliding groove 312, remove the push tube 2, and the catheter 1 springs back to its original size. The proximal end of the catheter is connected to the extracorporeal circulation device, and it works in conjunction with the proximal extracorporeal circulation device. After completion, the entire catheter 1 is removed from the human body.

[0096] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A catheter, characterized by, include: The tube body (12) has a cavity inside and a hole (121) communicating with the cavity is opened on its side wall; A hardened part (11) is provided at the distal end of the tube body. The hardened part (11) is adapted to abut against the push tube (2) inserted into the tube cavity and drive the tube body (12) and the connecting part (13) to move under the push of the push tube (2).

2. The catheter of claim 1, wherein, The proximal wall (114) of the hardened part is adapted to abut against the push tube (2).

3. The catheter according to claim 2, characterized in that, The proximal wall (114) of the hardened part is a plane perpendicular to the central axis of the lumen.

4. The catheter of claim 2, wherein, The hardened part (11) has an opening (111) inside. The opening (111) penetrates the hardened part (11) and communicates with the cavity. The inner diameter of the opening (111) is smaller than the inner diameter of the cavity, so that the push tube (2) can be housed inside the cavity when it abuts against the proximal wall (114) of the hardened part.

5. The catheter of claim 4, wherein, The central axis of the opening (111) is parallel to the central axis of the cavity.

6. The catheter of any one of claims 1-5, wherein, The hardened portion (11) is divided into a first hardened portion (112) and a second hardened portion (113) from the distal end to the proximal end; The first hardened part (112) is a single-layer elastic tube, and / or the second hardened part (113) is a multi-layer hardened tube and includes at least one first reinforcing layer.

7. The catheter of claim 6, wherein, The second hardened part (113) includes an inner polymer layer, a first reinforcing layer and an outer polymer layer, wherein the inner polymer layer, the first reinforcing layer and the outer polymer layer are arranged sequentially from the inside to the outside.

8. The catheter of any one of claims 1-5, wherein, The tube body is provided with a connecting part (13) at its proximal end. The connecting part (13) is provided with a through hole that communicates with the tube cavity. The through hole allows the push tube (2) to pass through.

9. The catheter of claim 8, wherein, The connecting part (13) is a multi-layer tube and includes at least one second reinforcing layer (131).

10. The catheter of claim 9, wherein, The connecting part (13) includes an inner tube (132), a second reinforcing layer (131), and an outer tube (133), which are arranged sequentially from the inside to the outside.

11. The catheter of any of claims 1-5, wherein, The outer diameter of the hardened part (11) gradually decreases from the proximal end to the distal end.

12. The catheter of any one of claims 1-5, wherein, The tube (12) is divided into a first tube (122) and a second tube (123) from the proximal end to the distal end, and the second tube (123) is transitionally connected to the hardened part (11).

13. The catheter of claim 12, wherein, The outer diameter of the second tube (123) gradually decreases from the proximal end to the distal end.

14. The catheter of any one of claims 1-5, wherein, The connection between the distal end face of the hardened part (11) and the side wall is set as an arc-shaped transition section.

15. The catheter of any one of claims 1-5, wherein, The tube (12) is a winding component, a mesh braiding component, a tubular cutting component, or a carved component.

16. The catheter of any one of claims 1-5, wherein, The tube body (12) is an elastic telescopic member; when the push tube (2) abuts against the hardened part (11), the axial length of the tube body (12) extends and the radial length of the tube body (12) shortens; when the push tube (2) disengages from the hardened part (11), the axial length of the tube body (12) shortens and the radial length of the tube body (12) extends.

17. The catheter of claim 16, wherein, The axial expansion ratio of the tube (12) is 1.5:1 to 2:1, and the radial expansion ratio of the tube (12) is 1.4:1 to 1.8:

1.

18. The catheter of any one of claims 1-5, wherein, The wall thickness of the connecting part (13) is the same from the distal end to the proximal end or gradually increases.

19. A push tube characterized in that, The push tube (2) is adapted to the conduit (1) according to any one of claims 1-18.

20. The push tube of claim 19, wherein, The distal wall of the push tube (2) is set to be planar and perpendicular to its central axis.

21. A push tube according to claim 19 or 20, characterized in that An elastic material layer (21) is provided on the distal wall of the push tube (2).

22. A flow guiding structure, characterized by include: The catheter (1) according to any one of claims 1-18; The push tube (2) according to any one of claims 19-21, wherein the push tube (2) is capable of being inserted into the conduit (1); A positioning structure (3) is provided at the proximal end of the catheter (1) and the proximal end of the push tube (2); the positioning structure (3) has a locked position and an unlocked position. When the positioning structure (3) is in the locked position, the push tube (2) is positioned inside the catheter (1) and can be synchronously delivered. When the positioning structure (3) is in the unlocked position, the push tube (2) and the catheter (1) are separated from each other.

23. The flow guiding structure of claim 22, wherein, The outer diameter of the proximal wall (114) of the hardened portion in the conduit (1) is not less than the outer diameter of the push tube (2), and the outer diameter of the push tube (2) is greater than the inner diameter of the opening (111).

24. The flow guiding structure of claim 22 or 23, wherein, When the conduit (1) is not elongated, the axial length ratio of the conduit (1) to the push tube (2) is 1:1.5 to 2.

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