Center positioning catheter assembly

Abstract

The utility model provides a central positioning catheter assembly, which relates to the technical field of medical instruments and comprises a catheter, a central positioning support and a guide wire. The catheter is sleeved with the center positioning support, the far end of the center positioning support is fixed to the catheter, and the near end of the center positioning support is movably arranged. The central positioning bracket has a tightening state and an unfolding state which can be switched, and the central positioning bracket has a trend of switching from the tightening state to the unfolding state; the far end of the guide wire is fixedly connected with the near end of the center positioning support, and the near end of the guide wire is used for being connected with the pulling force application part. The central positioning support can achieve central positioning of the catheter in the unfolded state, and the problem that the catheter deviates or is not coaxial with a blood vessel, and consequently the introduction position of an interventional instrument is not accurate is solved; and the center positioning catheter assembly is simple in structure and more convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a central positioning catheter assembly. Background Technology

[0002] Guiding catheters play a crucial role in peripheral vascular interventional procedures, primarily used to guide guidewires or catheters into the patient's peripheral vascular system. In these procedures, guiding catheters, as flexible conduits, are typically inserted through the puncture site in the patient's blood vessel to guide other interventional instruments to their target locations. This minimally invasive approach, compared to traditional surgery, offers advantages such as less trauma and faster recovery. Furthermore, the flexibility and precise control of guiding catheters reduce the risk of damage to surrounding healthy tissues.

[0003] To ensure the stability of the distal end of the guiding catheter and its coaxiality with the blood vessel, a support structure, such as a balloon, is usually installed at the distal end of the guiding catheter. Using the balloon for support allows for positioning of the distal end of the guiding catheter, ensuring the accuracy of the interventional device insertion. However, placing a balloon on the guiding catheter not only increases structural complexity but also makes the inflation and deflation of the balloon more cumbersome, increasing the difficulty of the surgical procedure.

[0004] Therefore, it is necessary to design a guide tube assembly that is simple in structure and easy to operate. Utility Model Content

[0005] The purpose of this invention is to provide a central positioning catheter assembly to solve the problems existing in the prior art. This allows the central positioning stent to centrally position the catheter when it is deployed, avoiding catheter displacement or misalignment with the blood vessel, which could lead to inaccurate insertion of interventional devices. Moreover, the central positioning catheter assembly has a simple structure and is more convenient to operate.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A central positioning catheter assembly includes a catheter, a central positioning support, and a guidewire. The central positioning support is sleeved outside the catheter, with its distal end fixed to the catheter and its proximal end movably disposed. The central positioning support has switchable tightened and extended states, and tends to switch from the tightened state to the extended state. The distal end of the guidewire is fixedly connected to the proximal end of the central positioning support, and the proximal end of the guidewire is used to connect a tension application part.

[0008] As one embodiment, the central positioning bracket is a cylindrical structure with a mesh-like sidewall; the central positioning bracket is made of shape memory alloy, and the fixed state of the central positioning bracket is the unfolded state.

[0009] As one embodiment, the catheter is further provided with a guide channel, the distal end of which is located near the proximal end of the central positioning bracket, and the distal end of the guidewire passes through the guide channel and is fixedly connected to the proximal end of the central positioning bracket.

[0010] In one embodiment, a heat-shrinkable tube is fitted on the outer wall of the catheter, the heat-shrinkable tube is located on the proximal side of the central positioning bracket, and the guidewire is slidably disposed in the gap between the heat-shrinkable tube and the catheter.

[0011] In one embodiment, an opening is provided on the side wall of the catheter, and the opening is located on the proximal side of the central positioning bracket; an inner tube is fixed on the inner wall of the catheter, and the inner tube is located on the proximal side of the opening; the distal end of the guidewire passes through the inner tube and the opening in sequence and is fixedly connected to the proximal end of the central positioning bracket.

[0012] In one embodiment, the proximal end of the inner tube is located at the proximal end of the catheter.

[0013] In one embodiment, a three-way connector is provided at the proximal end of the catheter. The first port of the three-way connector is fixedly connected to the proximal end of the catheter, and the second port of the three-way connector is used for the guidewire to pass through the inner tube.

[0014] As one embodiment, the proximal end of the guidewire is connected to a pull ring for applying tension.

[0015] As one embodiment, a contrast ring is provided at the connection point between the distal end of the central positioning bracket and the catheter.

[0016] In one embodiment, the developing ring is made of platinum-iridium alloy developing material, and the developing ring is fixed to the catheter by forging.

[0017] This utility model has the following technical advantages over the prior art:

[0018] This invention incorporates a central positioning stent on the catheter that can switch between a tightened and extended state. In the extended state, the stent ensures the catheter is centered, preventing catheter misalignment or misalignment with the blood vessel, which could lead to inaccurate insertion of interventional devices. Furthermore, by using a guidewire to pull the central positioning stent between tightened and extended states, the invention simplifies the structure of the central positioning catheter assembly, simplifies catheter support, reduces manufacturing costs, and improves surgical convenience.

[0019] Other technical effects of the present invention compared to the prior art are described in the specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the central positioning conduit assembly in the deployed state of the central positioning bracket in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the central positioning conduit assembly in the tightened state of the central positioning bracket in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the central positioning conduit assembly in the deployed state of the central positioning bracket in another embodiment of the present invention;

[0024] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0025] Figure 5 for Figure 3 A magnified view of part B in the diagram;

[0026] Figure 6 This is a schematic diagram showing the usage state of the central positioning conduit assembly in one embodiment of the present invention;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Catheter; 2. Central positioning stent; 3. Guidewire; 4. Opening; 5. Inner tube; 6. T-connector; 7. Pull ring; 8. Imaging ring. Detailed Implementation

[0029] 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.

[0030] The purpose of this invention is to provide a central positioning catheter assembly to solve the problems existing in the prior art. This allows the central positioning stent to centrally position the catheter when it is deployed, avoiding catheter displacement or misalignment with the blood vessel, which could lead to inaccurate insertion of interventional devices. Moreover, the central positioning catheter assembly has a simple structure and is more convenient to operate.

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1-6 As shown, this embodiment provides a central positioning catheter assembly, including a catheter 1, a central positioning stent 2, and a guidewire 3. The central positioning stent 2 is sleeved outside the catheter 1, with its distal end fixed to the catheter 1 and its proximal end movable. The central positioning stent 2 has two switchable states: a tightened state and an extended state. The central positioning stent 2 tends to switch from the tightened state to the extended state; that is, a certain external force is required to keep the central positioning stent 2 in the tightened state, and after the external force is removed, the central positioning stent 2 will return to the extended state due to its self-recovery deformation ability. The central positioning stent 2 is coaxial with the catheter 1 in both the tightened and extended states, and in the extended state, it can achieve central positioning of the catheter 1 within the blood vessel. The distal end of the guidewire 3 is fixedly connected to the proximal end of the central positioning bracket 2. The proximal end of the guidewire 3 is used to connect the tension application part. The surgeon pulls the guidewire 3 proximal through the tension application part, and the guidewire 3 can pull the central positioning bracket 2, so that the central positioning bracket 2 switches from the unfolded state to the tightened state.

[0033] In this embodiment, "proximal end" refers to the end closer to the surgeon, and "distal end" refers to the end farther away from the surgeon.

[0034] During use, the surgeon tightens the guidewire 3 by applying force. The central positioning support 2, under the tension of the guidewire 3, is in a tightened state, close to the wall of the catheter 1. Figure 2 As shown. Maintaining the central positioning stent 2 in a tightened state, after inserting catheter 1 into the affected area within the blood vessel, the surgeon removes the tension on guidewire 3 via the tension application point. The central positioning stent 2, no longer restrained by tension, switches to an extended state, abutting against the inner wall of the blood vessel to form support. The blood vessel, catheter 1, and central positioning stent 2 are coaxial, as shown. Figure 1 , Figure 3 , Figure 6 As shown. Finally, interventional devices can be introduced through catheter 1 to treat the affected area.

[0035] Therefore, this embodiment provides a central positioning stent 2 on the catheter 1 that can switch between a tightened and an extended state. In the extended state, the central positioning stent 2 can centrally position the catheter 1, preventing catheter 1 from shifting or becoming misaligned with the blood vessel, which could lead to inaccurate insertion of interventional devices. Furthermore, this embodiment uses a guidewire 3 to pull the central positioning stent 2 between the tightened and extended states, simplifying the structure of the central positioning catheter assembly and making the support of the catheter 1 more convenient. This reduces the manufacturing cost of the central positioning catheter assembly and improves the ease of surgical procedures.

[0036] In this embodiment, the central positioning stent 2 is a cylindrical structure made of a stretchable and deformable material. As one implementation, the central positioning stent 2 is made of a shape memory alloy, specifically a nickel-titanium alloy; and the sidewalls of the cylindrical structure are mesh-like with a square grid shape. When the central positioning stent 2 is in the deployed state, it is shaped so that it tends to return to the deployed state when in the tightened state. When the central positioning stent 2 is in the tightened state, it can fit tightly against the outer wall of the catheter 1 under the pulling force of the guidewire 3, improving the passage of the catheter 1. In this embodiment, after the central positioning stent 2 has the tendency to switch from the tightened state to the deployed state, it is not necessary to apply external force to switch it from the tightened state to the deployed state, thus avoiding the problem of the central positioning stent 2 damaging blood vessels due to excessive external force when switching it to the deployed state.

[0037] To facilitate the tightening and close contact of the central positioning bracket 2 with the wall of the catheter 1, a guide channel is provided on the catheter 1 in this embodiment. The distal end of the guide channel is positioned close to the proximal end of the central positioning bracket 2. The distal end of the guide wire 3 passes through the guide channel and is fixedly connected to the proximal end of the central positioning bracket 2. The diameter of the guide channel is smaller than the diameter of the catheter 1 and slightly larger than the diameter of the guide wire 3, allowing the guide wire 3 to slide smoothly within the guide channel. Thus, by providing a guide channel, this embodiment ensures that the pulling force of the guide wire 3 on the central positioning bracket 2 is directed towards both the proximal end of the guide wire 3 and the wall of the catheter 1. Under the pulling force of the guide wire 3, the central positioning bracket 2 is more easily tightened and deformed, thus adhering tightly to the wall of the catheter 1.

[0038] As one implementation of the guide channel, in this embodiment, a heat-shrink tubing is fitted onto the outer wall of the conduit 1, with the heat-shrink tubing located proximal to the central positioning bracket 2. A guide wire 3 is inserted into the heat-shrink tubing, positioned between the inner wall of the heat-shrink tubing and the outer wall of the conduit 1. After the heat-shrink tubing shrinks and adheres to the conduit 1, the portion of the guide wire 3 inside the heat-shrink tubing is tightly fitted to the conduit 1, and the guide wire 3 can be moved within the gap between the heat-shrink tubing and the conduit 1; at this time, the gap serves as the guide channel. Simultaneously, the heat-shrink tubing does not significantly increase the external dimensions of the conduit 1, ensuring the passability of the conduit 1.

[0039] As another implementation method of the guidance channel, such as Figure 3 , Figure 4 As shown, in this embodiment, an opening 4 is provided on the side wall of the catheter 1, and the opening 4 is located on the proximal side of the central positioning bracket 2; an inner tube 5 is fixed on the inner wall of the catheter 1, and the inner tube 5 is located on the proximal side of the opening 4. The distal end of the guidewire 3 passes through the inner tube 5 and the opening 4 in sequence and is fixedly connected to the proximal end of the central positioning bracket 2. At this time, the internal cavity of the inner tube 5 serves as a guiding channel. In order to avoid severe friction between the edge of the opening 4 and the guidewire 3, the front side edge and the rear side edge of the opening 4 are both sloped in this embodiment.

[0040] Theoretically speaking, similar to setting an inner tube 5 inside the catheter 1, it is also feasible to set an outer tube outside the catheter 1 for threading the guide wire 3. However, setting an outer tube will cause a significant change in the external dimensions of the catheter 1. This change in dimensions is much more significant than the change caused by setting a heat shrink tubing, and will significantly affect the passage of the catheter 1.

[0041] To facilitate the insertion of the guidewire 3 into the inner tube 5, in this embodiment, the proximal end of the inner tube 5 is located at the proximal end of the catheter 1. Specifically, the proximal end of the inner tube 5 can be flush with the proximal end of the catheter 1. After the guidewire 3 is inserted into the inner tube 5, interference between the guidewire 3 and the interventional instruments inserted into the catheter 1 can also be avoided.

[0042] As one implementation method, such as Figure 3 , Figure 5 As shown, a three-way connector 6 is provided at the proximal end of the catheter 1. The first port of the three-way connector 6 is fixedly connected to the proximal end of the catheter 1. The second port of the three-way connector 6 is used for the guide wire 3 to pass through the inner tube 5. The third port of the three-way connector 6 is freely disposed and can be used to introduce interventional treatment devices.

[0043] To facilitate the surgeon's pulling of the guidewire 3, in this embodiment, a pull ring 7 for applying tension is connected to the proximal end of the guidewire 3.

[0044] In this embodiment, a radiopaque ring 8 is provided at the connection point between the distal end of the central positioning stent 2 and the catheter 1. The radiopaque ring 8 is made of platinum-iridium alloy radiopaque material and is fixed to the catheter 1 by forging, which facilitates the surgeon to determine the position of the central positioning stent 2 using X-rays.

[0045] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0046] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A centrally positioned catheter assembly, characterized in that, include: catheter; A central positioning bracket is sleeved on the outside of the catheter, with its distal end fixed to the catheter and its proximal end movable; the central positioning bracket has a switchable tightened state and an extended state, and the central positioning bracket has a tendency to switch from the tightened state to the extended state. And a guide wire, the distal end of which is fixedly connected to the proximal end of the central positioning bracket, the proximal end of which is used to connect to the tension application part.

2. The central positioning catheter assembly according to claim 1, characterized in that, The central positioning bracket is a cylindrical structure with a mesh-like sidewall; the central positioning bracket is made of shape memory alloy, and its fixed state is the unfolded state.

3. The central positioning catheter assembly according to claim 1 or 2, characterized in that, The catheter is also provided with a guide channel, the distal end of which is located near the proximal end of the central positioning bracket. The distal end of the guidewire passes through the guide channel and is fixedly connected to the proximal end of the central positioning bracket.

4. The central positioning catheter assembly according to claim 3, characterized in that, A heat-shrink tubing is fitted on the outer wall of the conduit, and the heat-shrink tubing is located on the proximal side of the central positioning bracket. The guidewire is slidably disposed in the gap between the heat-shrink tubing and the conduit.

5. The central positioning catheter assembly according to claim 3, characterized in that, An opening is provided on the side wall of the catheter, and the opening is located on the proximal side of the central positioning bracket; an inner tube is fixed on the inner wall of the catheter, and the inner tube is located on the proximal side of the opening; the distal end of the guidewire passes through the inner tube and the opening in sequence and is fixedly connected to the proximal end of the central positioning bracket.

6. The central positioning catheter assembly according to claim 5, characterized in that, The proximal end of the inner tube is located at the proximal end of the catheter.

7. The central positioning catheter assembly according to claim 6, characterized in that, The proximal end of the catheter is provided with a three-way connector. The first port of the three-way connector is fixedly connected to the proximal end of the catheter, and the second port of the three-way connector is used for the guidewire to pass through the inner tube.

8. The central positioning catheter assembly according to claim 7, characterized in that, The proximal end of the guidewire is connected to a pull ring for applying tension.

9. The central positioning catheter assembly according to claim 1, characterized in that, A contrast ring is provided at the connection point between the distal end of the central positioning bracket and the catheter.

10. The central positioning catheter assembly according to claim 9, characterized in that, The developing ring is made of platinum-iridium alloy developing material, and the developing ring is fixed to the catheter by forging.

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