Thrombolytic catheter with variable thrombolytic contact surface

Abstract

The utility model discloses a thrombolytic catheter of thrombolytic contact surface variable in the technical field of thrombolytic catheter, including ring pipe department, and ring pipe department is set in sheath pipe, and is provided with the thrombolytic department for the output medicine of thrombus to ring pipe department in, when ring pipe department end reaches the thrombus position, and sheath pipe is withdrawn to expose the thrombolytic department in ring pipe department, the thrombolytic department is by a plurality of petal type catheter and is enclosed to form the multivalve type catheter with the open and close function, and a plurality of petal type catheters are enclosed and form the guide wire hole for shuttling guide wire in the center, and are provided with the drug release section in the end of every petal type catheter, and the outer surface of drug release section is provided with a plurality of medicine outlet holes, and every petal type catheter of multivalve type catheter is opened to form the petal type structure to the outside after sheath pipe is withdrawn to expand the contact area with thrombus.

Description

Technical Field

[0001] This utility model relates to the field of thrombolytic catheter technology, specifically to a thrombolytic catheter with a variable thrombolytic contact surface. Background Technology

[0002] A thrombolytic catheter is a specially designed multi-port catheter that can be precisely placed inside a thrombus under guidewire guidance. This catheter's design allows it to cover long segments of arterial and venous thrombi and directly infuse thrombolytic drugs into the thrombus, thus achieving local thrombolysis. Thrombolytic catheters are typically made of flexible materials to adapt to the tortuous and complex structures within blood vessels, while minimizing patient discomfort.

[0003] Because thrombolytic catheters need to penetrate deep into blood vessels, their diameter is much smaller than the vessel diameter, resulting in a smaller contact area between the catheter and the venous thrombus, thus leading to lower thrombolysis efficiency. To address this issue, existing technologies generally employ methods to increase the contact area, such as designing the end of the thrombolytic catheter to be openable.

[0004] However, in the existing technology, the opening angle of the thrombolytic catheter tip cannot be adjusted according to the thickness of the blood vessel. In order to improve the versatility of the thrombolytic catheter, the opening structure of the thrombolytic catheter tip is still set to be small, the contact area with the thrombus is only slightly increased, and the improvement of thrombolytic efficiency is limited. Utility Model Content

[0005] The purpose of this invention is to provide a thrombolytic catheter with a variable thrombolytic contact surface, in order to solve the technical problem that the contact surface between the thrombolytic catheter and the venous thrombus is small in the prior art, resulting in low thrombolytic efficiency.

[0006] To solve the above-mentioned technical problems, this utility model specifically provides a thrombolytic catheter with a variable thrombolytic contact surface, including a ring tube portion, which is sleeved inside a sheath tube. A thrombolytic part for delivering drugs to the thrombus is provided inside the ring tube portion. When the end of the ring tube portion reaches the thrombus position, the sheath tube is retracted to expose the thrombolytic part located inside the ring tube portion. The thrombolytic section is a multi-valve catheter with opening and closing function, formed by multiple valve catheters. After the multiple valve catheters are enclosed, a guidewire hole for shuttle guidewire is formed in the center. Each valve catheter has a drug release section at its end, and multiple drug outlet holes are provided on the outer surface of the drug release section. Each valve catheter of the multi-valve catheter opens outward to form a petal structure after the sheath retracts. The diameter of the petal structure can be adjusted according to the thickness of the blood vessel to expand the contact area with the thrombus.

[0007] In a preferred embodiment of the present invention, the valve catheter is elastic, flexible, and has shape memory, so that it can naturally open outward and contact the blood vessel wall after the sheath is retracted.

[0008] In a preferred embodiment of this utility model, the valve-type catheter is elastic, flexible, and has shape memory, and can close in a natural state. Each valve catheter is connected to the inner wall of the sheath via a traction wire, which allows the valve catheter to be pulled open when the sheath is retracted, and the retraction distance of the sheath can be adjusted according to the diameter of the blood vessel so that the valve catheter contacts the blood vessel wall.

[0009] In a preferred embodiment of this utility model, each of the valve-type catheters can be naturally bent outwards when exposed outside the sheath, so as to be further pulled open by the traction wire.

[0010] In a preferred embodiment of this invention, the sides of each valve catheter can be sequentially fitted to form a complete annular structure to improve the maximum flow efficiency of thrombolytic drugs in the thrombolytic section.

[0011] In a preferred embodiment of this utility model, the end edge of the multi-valve catheter is arc-shaped to avoid damaging human tissue.

[0012] Compared with the prior art, this utility model has the following advantages: The thrombolysis unit is configured as a multi-valve catheter with opening and closing function, formed by multiple valve-type catheters. After the thrombolysis unit is exposed from the sheath, each valve-type catheter opens outward to form a petal-like structure. The size / diameter of the petal-like structure can be adjusted according to the thickness of the blood vessel to ensure that the petal-like structure fills the blood vessel. On the one hand, this maximizes the contact area with the thrombus and improves the thrombolysis efficiency. On the other hand, as the thrombolysis process progresses, the petal-like structure further unfolds slowly, allowing it to partially or even completely enclose the thrombus, maintaining continuous contact with the remaining thrombus to achieve the purpose of "continuous, contact thrombolysis" and further improve the thrombus dissolution efficiency. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the valve-type catheter of this utility model during closure; Figure 2 This is a schematic diagram of the structure of the valve-type catheter of this utility model when it is open.

[0015] The labels in the diagram represent the following: 1-Circular tube section, 2-Thrombolysis section, 3-Guide wire hole, 4-Valve catheter, 5-Sheath, 6-Traction wire, 7-Arc-shaped surface, 8-Drug outlet. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model specifically provides a thrombolytic catheter with a variable thrombolytic contact surface, including a ring tube 1, which is sleeved inside a sheath 5. A thrombolytic section 2 for delivering drugs to the thrombus is provided inside the ring tube 1. When the end of the ring tube 1 reaches the thrombus position, the sheath 5 is retracted to expose the thrombolytic section 2 located inside the ring tube 1. The thrombolytic section 2 is a multi-valve catheter with opening and closing function formed by multiple valve catheters 4. After the multiple valve catheters 4 are enclosed, a guidewire hole 3 for passing a guidewire is formed in the center. Each valve catheter 4 has a drug release section at its end. Multiple drug outlet holes 8 are provided on the outer surface of the drug release section. The thrombolytic drug enters the thrombolytic section 2 through the ring tube section 1 and is output to the thrombus through the drug outlet holes 8 in the drug release section. Each valve of the multi-valve catheter 4 opens outward to form a petal-like structure after the sheath 5 is withdrawn. The opening angle of the valve 4 can be adjusted according to the thickness of the blood vessel, that is, the diameter of the petal-like structure can be adjusted according to the thickness of the blood vessel to expand the contact area with the thrombus.

[0018] As the thrombolysis process progresses, the petal-shaped structure slowly unfolds, allowing it to maintain continuous contact with the remaining thrombus, thus achieving the goal of "continuous, contact thrombolysis" and further improving the thrombus dissolution efficiency.

[0019] After the preparation for thrombolysis is completed, the thrombolysis catheter and sheath 5 are inserted into the blood vessel as a whole under the guidance of the guidewire. When the thrombolysis part 2 at the front end of the loop 1 reaches the thrombus, the sheath 5 is withdrawn so that the thrombolysis part 2 is exposed in the sheath 5.

[0020] After the thrombolysis section 2 exposes the sheath 5, each valve-type catheter 4 opens outward to form a petal-like structure. The size / diameter of the petal-like structure can be adjusted according to the thickness of the blood vessel. On the one hand, it can maximize the contact area with the thrombus and improve the thrombolysis efficiency. On the other hand, as the thrombolysis work progresses, the thrombolysis catheter slowly advances forward, allowing the petal-like structure to partially or even completely enclose the thrombus. The petal-like structure further slowly unfolds, allowing it to maintain "contact" with the remaining thrombus, thereby achieving the purpose of "continuous, contact thrombolysis" and further improving the thrombus dissolution efficiency.

[0021] This invention provides two methods to enable the opening angle of the valve catheter 4 to be adjusted according to the thickness of the blood vessel.

[0022] The first type: The valve catheter 4 is elastic, flexible, and has shape memory. After the sheath 5 is retracted, the valve catheter 4 can naturally open outward according to its own shape memory. The diameter of the fully opened petal-shaped structure is larger than that of a normal blood vessel, ensuring that the opened valve catheter 4 can contact the blood vessel wall and maximize the contact area with the thrombus.

[0023] In addition, because the valve catheter 4 is elastic and flexible, on the one hand, the contact with the blood vessel is a flexible contact, avoiding damage to the blood vessel; on the other hand, after contacting the blood vessel wall, the valve catheter 4 is constrained by the blood vessel wall and will not further compress the blood vessel, thus avoiding rupture of the blood vessel.

[0024] Understandably, valve catheters 4 should be made of materials with excellent elasticity to ensure maximum opening while reducing the interaction force when in contact with blood vessels.

[0025] It is clear that after the thrombolysis is completed, the sheath 5 can be advanced forward and repositioned to overcome the elasticity of the valve catheter 4, allowing the petal-shaped structure to close and the thrombolysis part 2 to re-enter the sheath 5, so that the sheath 5 and the thrombolysis catheter can be removed from the blood vessel.

[0026] Furthermore, the sides of each valve catheter 4 can sequentially fit together to form a complete annular structure. This annular structure adapts to the annular sheath 5, maximizing the volume of the valve catheter 4 and thus improving the maximum flow efficiency of thrombolytic drugs within the thrombolytic section 2. Under otherwise identical conditions, it also increases the contact area with the thrombus.

[0027] Furthermore, the tip edge of the multi-valve catheter is curved 7 to avoid damaging human tissue.

[0028] The second type: The valve-type catheter 4 is elastic, flexible, and has shape memory, allowing it to close naturally. Each valve catheter 4 is connected to the inner wall of the sheath 5 via a traction wire 6. When the sheath 5 is retracted, the valve catheter 4 can be exposed. At the same time, the valve catheter 4 can be pulled open by the traction wire 6. The greater the retraction distance of the sheath 5, the greater the pulling force on the valve catheter 4, and the larger the diameter of the petal-shaped structure formed. The retraction distance of the sheath 5 can be adjusted according to the thickness of the blood vessel, thereby adjusting the diameter of the petal-shaped structure so that the valve catheter 4 contacts the blood vessel wall.

[0029] Because of the flexibility of the valve catheter 4, the contact with the blood vessel is flexible, avoiding damage to the blood vessel; because of the elasticity of the valve catheter 4, it can maintain a good shape after being pulled by the traction wire 6, so as to avoid the valve catheter 4 being too soft and unable to be shaped.

[0030] Since each valve catheter 4 is made of elastic material, if each valve catheter 4 is in a straight state in its natural state, the angle between the traction force on each valve catheter 4 and itself is small, making it difficult for the traction wire 6 to bend each valve catheter 4. Therefore, when each valve catheter 4 is exposed outside the sheath 5, it can naturally bend outward by 5-10°, and initially there is a certain angle between the traction force and the valve catheter 4, so that it can be further pulled open by the traction wire 6.

[0031] Furthermore, the sides of each valve catheter 4 can sequentially fit together to form a complete annular structure. This annular structure adapts to the annular sheath 5, maximizing the volume of the valve catheter 4 and thus improving the maximum flow efficiency of thrombolytic drugs within the thrombolytic section 2. Under otherwise identical conditions, it also increases the contact area with the thrombus.

[0032] Furthermore, the tip edge of the multi-valve catheter is curved 7 to avoid damaging human tissue.

[0033] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A thrombolytic catheter with a variable thrombolytic contact surface, characterized in that, Includes a ring tube (1), which is sleeved inside a sheath (5). A thrombolytic section (2) for delivering drugs to the thrombus is provided inside the ring tube (1). When the end of the ring tube (1) reaches the thrombus position, the sheath (5) is retracted to expose the thrombolytic section (2) located inside the ring tube (1). The thrombolytic section (2) is a multi-valve catheter with opening and closing function formed by multiple valve catheters (4). After the multiple valve catheters (4) are enclosed, a guide wire hole (3) for shuttle guide wire is formed in the center. A drug release section is provided at the end of each valve catheter (4). Multiple drug outlet holes (8) are provided on the outer surface of each drug release section. Each valve catheter (4) of the multi-valve catheter opens outward to form a petal structure after the sheath (5) is withdrawn. The diameter of the petal structure can be adjusted according to the thickness of the blood vessel to expand the contact area with the thrombus.

2. The thrombolytic catheter with a variable thrombolytic contact surface according to claim 1, characterized in that, The valve catheter (4) is elastic, flexible, and shape-memory so that it can naturally open outward and contact the blood vessel wall after the sheath (5) is retracted.

3. The thrombolytic catheter with a variable thrombolytic contact surface according to claim 1, characterized in that, The valve-type catheter (4) is elastic, flexible, and has shape memory, and can close in a natural state; Each valve catheter (4) is connected to the inner wall of the sheath (5) via a traction wire (6) on its outer side, so that the valve catheter (4) can be pulled open when the sheath (5) retracts, and the retraction distance of the sheath (5) can be adjusted according to the diameter of the blood vessel so that the valve catheter (4) contacts the blood vessel wall.

4. A thrombolytic catheter with a variable thrombolytic contact surface according to claim 3, characterized in that, Each of the valve catheters (4) can bend naturally outward when exposed outside the sheath (5) to facilitate further traction and opening by the traction wire (6).

5. A thrombolytic catheter with a variable thrombolytic contact surface according to claim 1, characterized in that, The sides of each valve catheter (4) can be sequentially fitted to form a complete annular structure to improve the maximum flow efficiency of thrombolytic drugs in the thrombolytic section (2).

6. A thrombolytic catheter with a variable thrombolytic contact surface according to claim 1, characterized in that, The end edge of the multi-valve catheter is arc-shaped (7) to avoid damaging human tissue.

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