Interventional telescopic catheter for cerebrovascular surgery

Abstract

The interventional telescopic catheter comprises an outer tube and an inner tube, one end of the inner tube is connected with a catheter connector, and the other end of the inner tube is arranged in an inner cavity of the outer tube in a sleeved mode; a plurality of triangular salient points are arranged on the inner wall of one end, close to the guide pipe joint, of the outer pipe, the end face of one end, facing the guide pipe joint, of each triangular salient point is a plane perpendicular to the inner wall of the outer pipe, and the end face of the inner end, facing the body, of each triangular salient point is an inclined plane inclined to the inner wall of the outer pipe; at least two annular grooves are formed in the outer wall of the inner pipe and matched with the triangular protruding points. A limiting ring is arranged on the inner wall of one end port, close to the catheter connector, of the outer tube, and a stop flange is arranged on the outer wall of one end port, sleeved with an inner cavity of the outer tube, of the inner tube. According to the interventional telescopic catheter for the cerebrovascular surgery, the effective working length of the catheter can be prolonged in the surgery, the replacement and adjustment time of the catheter in the surgery is shortened, then the vascular injury and infection risk is reduced, and the operation safety and the working efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of interventional devices for cerebrovascular surgery, and more specifically, to an interventional telescopic catheter for cerebrovascular surgery. Background Technology

[0002] A cerebrovascular interventional catheter is a long, tubular medical device used in the diagnosis and treatment of cerebrovascular diseases. Its main function is to establish a stable pathway for guidewires, microcatheters, and other interventional instruments during surgery, and to precisely deliver medications or contrast agents during angiography or treatment. A typical cerebrovascular interventional catheter usually consists of a tube body and a proximal connector. The tube body can accommodate guidewires and therapeutic instruments, and contrast-enhancing rings or wires are embedded in the tube wall to clearly visualize the location under X-ray fluoroscopy, thus assisting the operator in positioning and manipulation. The tube body is generally made of materials with good biocompatibility and flexural strength, such as Pebax or polytetrafluoroethylene (PTFE), and its torsional resistance is improved by a metal braided mesh or nickel-titanium wire reinforcement layer.

[0003] Currently, most routine cerebrovascular interventional catheters used in clinical practice are designed with a fixed length. These catheters can meet the requirements in most surgeries. However, some patients are tall or have tortuous blood vessel paths, which may lead to situations where the catheter is too short after it has been inserted into the body. This results in the catheter tip not being able to reach the target blood vessel smoothly. In this case, the surgeon has to replace it with a longer catheter or adjust the approach, which not only increases the operation time and operational risks, but may also increase the probability of vascular injury and infection. On the other hand, if the catheter length is set too long, it is not convenient to perform surgery on ordinary patients or patients with short stature.

[0004] Therefore, it is necessary to design an interventional catheter structure that can extend its length without replacing the catheter, so that the effective working length can be flexibly extended according to the needs of the operation when the catheter has been partially inserted into the patient's body, thereby improving the adaptability and efficiency of cerebrovascular interventional surgery. Summary of the Invention

[0005] To address the problems of existing technologies, embodiments of the present invention provide an interventional telescopic catheter for cerebrovascular surgery. The technical solution is as follows:

[0006] This invention provides an interventional telescopic catheter for cerebrovascular surgery, comprising: an outer tube and an inner tube, one end of the inner tube being connected to a catheter connector, and the other end of the inner tube being fitted into the inner cavity of the outer tube, the inner tube and the outer tube forming an overlapping section along the axial direction; the inner wall of the outer tube near the catheter connector has a plurality of triangular protrusions, the end face of the triangular protrusions facing the catheter connector being a plane perpendicular to the inner wall of the outer tube, and the end face of the triangular protrusions facing the inner end being an inclined surface inclined to the inner wall of the outer tube; the outer wall of the inner tube has at least two annular grooves, the annular grooves matching the triangular protrusions; a limiting ring is provided on the inner wall of the end port of the outer tube near the catheter connector, and a stop flange is provided on the outer wall of the end port of the inner tube fitted into the inner cavity of the outer tube, the limiting ring being used to cooperate with the stop flange to prevent the inner tube from completely dislodging from the outer tube.

[0007] Furthermore, the outer tube is 90cm long and the inner tube is 20cm long.

[0008] Furthermore, the outer tube wall is embedded with a developing mark ring or developing wire.

[0009] Furthermore, the developing marking ring is made of platinum-iridium alloy or tungsten wire.

[0010] Furthermore, the triangular protrusions form a closed ring structure along the inner wall of the outer tube.

[0011] Furthermore, the number of the triangular protrusions is four, and the four triangular protrusions are evenly distributed along the circumferential direction of the inner wall of the outer tube.

[0012] Furthermore, the number of annular grooves is three, and the three annular grooves are spaced apart along the axial direction of the inner tube.

[0013] Furthermore, the protrusion height of the triangular protrusion is 0.05 to 0.08 mm.

[0014] Furthermore, the annular groove matches the triangular protrusion, and the depth of the annular groove is less than or equal to 1.1 times the protrusion height of the triangular protrusion.

[0015] Furthermore, length markings are provided on the outer wall of the inner tube.

[0016] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0017] This invention provides an interventional telescopic catheter for cerebrovascular surgery. By comprising an inner tube and an outer tube, the inner tube is fitted within the lumen of the outer tube. When needed, the inner tube can be pulled out of the outer tube, effectively extending the working length of the catheter. The design incorporates triangular protrusions and annular grooves to provide stable positioning during the pulling process. It also achieves a unidirectional sliding function, allowing the inner tube to slide outwards for extension while being obstructed when sliding deeper into the outer tube. This prevents the inner tube from reversing and entering the outer tube during further insertion into the patient's body, improving operational stability and safety. A stop flange and limiting ring are included to prevent the inner tube from completely dislodging from the outer tube, ensuring safe intraoperative adjustments. Compared to existing fixed-length catheters, this invention extends the effective working length of the catheter without requiring intraoperative catheter replacement, reducing the time spent on catheter changes and adjustments, lowering the risk of vascular injury and infection, and improving the safety and efficiency of cerebrovascular interventional procedures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an interventional telescopic catheter for cerebrovascular surgery according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional schematic diagram of the overlapping section of the outer tube and the inner tube in an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] This invention provides an interventional telescopic catheter for cerebrovascular surgery, see [link to relevant documentation]. Figure 1-2The device includes an outer tube 1 and an inner tube 2. One end of the inner tube 2 is connected to a catheter connector 3, and the other end of the inner tube 2 is fitted into the inner cavity of the outer tube 1. The inner tube 2 and the outer tube 1 overlap along the axial direction. Several triangular protrusions 11 are provided on the inner wall of the end of the outer tube 1 near the catheter connector 3. The end face of the triangular protrusions 11 facing the catheter connector 3 is a plane perpendicular to the inner wall of the outer tube 1, and the end face of the triangular protrusions 11 facing the inner end is an inclined surface inclined to the inner wall of the outer tube 1. At least two annular grooves 21 are provided on the outer wall of the inner tube 2, and the annular grooves 21 match the triangular protrusions 11. A limiting ring 12 is provided on the inner wall of the end port of the outer tube 1 near the catheter connector 3, and a stop flange 22 is provided on the outer wall of the end port of the inner tube 2 fitted into the inner cavity of the outer tube 1. The limiting ring 12 is used to cooperate with the stop flange 22 to prevent the inner tube 2 from completely coming out of the outer tube 1.

[0023] Furthermore, the outer tube 1 has a length of 90cm, and the inner tube 2 has a length of 20cm.

[0024] Specifically, the outer tube 1 is 90cm long and is the main working section of the catheter. The end near the outside of the body is the proximal end, and the other end is the distal end. The proximal end of the outer tube 1 overlaps with the inner tube 2, and the distal end has a flexible guide section to reduce damage to the blood vessel wall. The inner tube 2 is 20cm long. One end of the inner tube 2 is inserted into the lumen of the proximal end of the outer tube 1 to form an overlap, and the other end is connected to the catheter connector 3. The catheter connector 3 is fixedly connected to the inner tube 2 by medical epoxy adhesive or heat fusion. The catheter connector 3 is used to connect a syringe, a Y valve, or other interventional devices. The inner tube 2 is inserted into the outer tube 1, and the two are coaxially fitted together along the axial direction. The fitting gap is controlled within the range of 0.05-0.1mm to ensure smooth sliding and prevent leakage. Both the outer tube 1 and the inner tube 2 are made of polymer composite materials with good biocompatibility and flexural strength. The outer tube 1 is made of Pebax material with an embedded stainless steel braided mesh or nickel-titanium alloy wire reinforcement layer, and the inner tube 2 is made of Pebax material.

[0025] Near the proximal end of the inner wall of the outer tube 1, several triangular protrusions 11 are distributed circumferentially. The end face of the triangular protrusion 11 facing outward is a plane perpendicular to the inner wall of the outer tube 1, and the end face facing inward is an inclined surface inclined to the inner wall of the outer tube 1. At least two annular grooves 21 are provided on the outer wall of the inner tube 2. The annular grooves 21 are spaced axially on the outer wall of the inner tube 2. The annular grooves 21 match the triangular protrusions 11. The triangular protrusions 11 can be inserted into the annular grooves 21. The plane of the triangular protrusions 11 and the plane of the annular grooves 21 cooperate to form a block when the inner tube 2 moves towards the depth of the outer tube 1. The inclined surface of the triangular protrusions 11 and the inclined surface of the annular grooves 21 cooperate to achieve over-sliding when the inner tube 2 moves towards the outside. The triangular protrusion 11 is integrally formed on the inner wall of the outer tube 1 and is made of a polymer material with a certain degree of elasticity. Combined with the elasticity of the outer tube 1 material, the triangular protrusion 11 can undergo slight deformation under force, thus possessing the ability of "elastic yielding" during the sliding of the inner tube 2. When the inner tube 2 is pulled outward, the inclined surface of the annular groove 21 contacts the inclined surface of the triangular protrusion 11. As the pulling force increases, the triangular protrusion 11 is compressed outward under the action of elasticity, making room so that the inner tube 2 can smoothly pass over the triangular protrusion 11. When the inner tube 2 is subjected to force inward, the planes of the annular groove 21 and the triangular protrusion 11 abut against each other. Since there is no inclined buffer, the triangular protrusion 11 cannot be easily compressed and yielded in this direction. Therefore, it can effectively prevent the inner tube 2 from retracting to a deeper position in the outer tube 1 during the pushing process, maintaining the stability and safety of the extended length. After the triangular protrusion 11 is inserted into the annular groove 21, the positions of the inner tube 2 and the outer tube 1 are relatively fixed and not easy to slide. When it is necessary to pull the inner tube 2 out of the outer tube 1, the force is increased and the triangular protrusion 11 moves along the inclined surface into the next annular groove 21 to achieve segmented positioning. When the inner tube 2 moves deeper into the outer tube 1, the triangular protrusion 11 and the plane of the annular groove 21 form a block, thereby preventing the inner tube 2 from reversing and entering the outer tube 1 during the process of pushing the catheter into the patient's body, thus improving the stability and safety of the operation.

[0026] A limiting ring 12 is provided on the inner wall near the port of the outer tube 1. A stop flange 22 is provided on the outer wall of the end port of the inner tube 2, which is fitted into the inner cavity of the outer tube 1. The stop flange 22 has a ring structure. The limiting ring 12 and the stop flange 22 cooperate to prevent the inner tube 2 from completely detaching from the outer tube 1. When the inner tube 2 slides outward to its limit position, the stop flange 22 abuts against the limiting ring 12, thereby preventing the inner tube 2 from completely detaching from the outer tube 1.

[0027] In the initial state, the inner tube 2 is almost completely inserted into the outer tube 1, with a total effective working length of 90cm. The triangular protrusion 11 is engaged in the annular groove 21 at the end of the inner tube closest to the catheter connector 3. If, during the procedure, it is found that the distal end of the catheter cannot reach the target blood vessel, the surgeon uses their hand to stabilize the outer tube 2, holds the catheter connector 3, and pulls the inner tube 2 axially out, allowing the triangular protrusion 11 to pass over the inclined surface of the annular groove 21 and engage in the next position, extending the effective working length of the catheter until the length meets the surgical requirements. A slight "click" sound indicates successful engagement when the annular groove 21 on the outer wall of the inner tube 2 engages with the triangular protrusion 11 on the inner wall of the outer tube 1. A slight pull will feel resistance; continue advancing the catheter to the target position to complete subsequent surgical procedures. The stop flange 22 and the limiting ring 12 prevent the inner tube 2 from completely dislodging from the outer tube 1. The planar blocking effect of the triangular protrusion 11 and the annular groove 21 prevents the extended inner tube 2 from regressing into the depths of the outer tube 1 during pushing.

[0028] Furthermore, a developing mark ring or developing wire is embedded in the inner wall of the outer tube 1.

[0029] Furthermore, the developing marking ring is made of platinum-iridium alloy or tungsten wire.

[0030] Specifically, the outer tube 1 is equipped with a developing mark ring or developing wire to ensure that positional changes can be observed in real time under X-ray fluoroscopy. The developing material is a platinum-iridium alloy or tungsten wire.

[0031] Furthermore, the triangular protrusions 11 form a closed ring structure along the inner wall of the outer tube 1.

[0032] Furthermore, there are four triangular protrusions 11, which are evenly distributed along the circumferential direction of the inner wall of the outer tube 1.

[0033] Specifically, the triangular protrusions 11 are evenly distributed along the circumferential direction of the inner wall of the outer tube 1. In this embodiment, there are 4 triangular protrusions 11. In other applications, the number of triangular protrusions 11 can be other numbers, and a closed ring structure can also be formed along the inner wall of the outer tube 1.

[0034] Furthermore, there are three annular grooves 21, which are spaced apart along the axial direction of the inner tube 2.

[0035] Specifically, at least two annular grooves 21 are provided on the outer wall of the inner tube 2. The annular grooves 21 are spaced apart along the axial direction on the outer wall of the inner tube 2 to allow for multiple positioning positions and to adjust different extension lengths as needed during the operation.

[0036] Furthermore, the protrusion height of the triangular protrusion 11 is 0.05 to 0.08 mm.

[0037] Furthermore, the annular groove 21 matches the triangular protrusion 11, and the depth of the annular groove 21 is less than or equal to 1.1 times the protrusion height of the triangular protrusion 11.

[0038] Furthermore, a length mark is provided on the outer wall of the inner tube 2.

[0039] Specifically, the outer wall of the inner tube 2 is marked with a length indicator to help the surgeon determine the exact length of the catheter extension.

[0040] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0041] This invention provides an interventional telescopic catheter for cerebrovascular surgery. By comprising an inner tube and an outer tube, the inner tube is fitted within the lumen of the outer tube. When needed, the inner tube can be pulled out of the outer tube, effectively extending the working length of the catheter. The design incorporates triangular protrusions and annular grooves to provide stable positioning during the pulling process. It also achieves a unidirectional sliding function, allowing the inner tube to slide outwards for extension while being obstructed when sliding deeper into the outer tube. This prevents the inner tube from reversing and entering the outer tube during further insertion into the patient's body, improving operational stability and safety. A stop flange and limiting ring are included to prevent the inner tube from completely dislodging from the outer tube, ensuring safe intraoperative adjustments. Compared to existing fixed-length catheters, this invention extends the effective working length of the catheter without requiring intraoperative catheter replacement, reducing the time spent on catheter changes and adjustments, lowering the risk of vascular injury and infection, and improving the safety and efficiency of cerebrovascular interventional procedures.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An interventional telescopic catheter for cerebrovascular surgery, characterized in that, include: The device comprises an outer tube and an inner tube. One end of the inner tube is connected to a catheter connector, and the other end of the inner tube is fitted into the inner cavity of the outer tube. The inner tube and the outer tube overlap axially. Several triangular protrusions are provided on the inner wall of the end of the outer tube near the catheter connector. The end face of each triangular protrusion facing the catheter connector is perpendicular to the inner wall of the outer tube, and the end face facing the inner end is inclined to the inner wall of the outer tube. At least two annular grooves are provided on the outer wall of the inner tube, and these grooves match the triangular protrusions. A limiting ring is provided on the inner wall of the end of the outer tube near the catheter connector, and a stop flange is provided on the outer wall of the end of the inner tube fitted into the inner cavity of the outer tube. The limiting ring engages with the stop flange to prevent the inner tube from completely dislodging from the outer tube.

2. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The outer tube is 90cm long, and the inner tube is 20cm long.

3. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The outer tube wall is embedded with a developing mark ring or developing wire.

4. The interventional telescopic catheter for cerebrovascular surgery as described in claim 3, characterized in that, The developing marking ring is made of platinum-iridium alloy or tungsten wire.

5. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The triangular protrusions form a closed ring structure along the inner wall of the outer tube.

6. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The number of the triangular protrusions is 4, and the 4 triangular protrusions are evenly distributed along the circumferential direction of the inner wall of the outer tube.

7. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The number of annular grooves is three, and the three annular grooves are spaced apart along the axial direction of the inner tube.

8. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The protrusion height of the triangular protrusion is 0.05 to 0.08 mm.

9. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The annular groove matches the triangular protrusion, and the depth of the annular groove is less than or equal to 1.1 times the protrusion height of the triangular protrusion.

10. The interventional telescopic catheter for cerebrovascular surgery as described in claim 1, characterized in that, The outer wall of the inner tube is marked with a length indicator.

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