Microcatheter

Abstract

The utility model discloses a micro catheter, and belongs to the field of medical instruments. Comprising a catheter body provided with a guide wire channel and an inflation channel; the balloon is arranged on the outer side of the tube body in a sleeving manner; the tip is arranged at one end, close to the balloon, of the tube body; a pressure pump is arranged at one end of the inflation channel, one end of the inflation channel is communicated with the balloon to inflate the balloon, at least one thread is wound around the tip, and a rotating cap is fixedly arranged on the tube body. The micro-catheter has the beneficial effect that the pushing force and the torsion force of the micro-catheter are effectively improved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more specifically, to a microcatheter. Background Technology

[0002] With the improvement of people's living standards and changes in dietary habits, cardiovascular and cerebrovascular diseases are becoming increasingly prominent. It is difficult to reopen chronically blocked blood vessels. Even after the guidewire passes through, subsequent microcatheters and ordinary balloons still have difficulty passing through, leading to failure to open blood vessels and seriously affecting people's health.

[0003] Balloon balloon therapy is currently a popular treatment method. A balloon, like a miniature balloon, is inserted through a guidewire into the narrowed area of ​​the blood vessel. A pressure pump inflates the balloon, squeezing the narrowed plaque and widening the narrowed area. However, with current technology, microcatheters and regular balloons cannot pass through the lesion area after the guidewire has passed the blockage in chronic occlusive vascular lesions. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section above, some embodiments of this application provide a microcatheter, including:

[0006] The tube body has a guide wire channel and an inflation channel;

[0007] A balloon is fitted over the outside of the tube body;

[0008] The tip is located at the end of the tube body near the balloon.

[0009] The guide wire channel is designed to pass through the front and rear of the tube. One end of the inflation channel is equipped with a pressure pump and is connected to the balloon to inflate the balloon. At least one threaded wire is wound around the tip of the tube, and a rotating cap is fixed on the tube body.

[0010] This application utilizes a rotating cap to drive the tube body to rotate, which in turn drives the threaded wire to rotate. This effectively increases the pushing force and torque of the microcatheter, making it easier to twist and push the microcatheter forward, facilitating its entry into the lesion area. This ensures that the balloon can effectively inflate and expand the lesion area, reducing surgical time and costs.

[0011] Furthermore, the two ends of the threaded wire are welded to the tip and the tube body, respectively.

[0012] Furthermore, the balloon is cone-shaped.

[0013] Furthermore, the outer diameter of the tip gradually decreases from one end near the tube body to the other.

[0014] Furthermore, the guidewire channel has a transition section at one end of the tip.

[0015] Furthermore, the inner diameter of the transition section gradually decreases from one end near the pipe body to the other end.

[0016] Furthermore, the tube body includes an inner layer, a braided layer, and an outer layer in sequence from the guide wire channel outwards, with one end of the braided layer extending into the tip.

[0017] Furthermore, a spring layer is provided between the inner layer and the braided layer.

[0018] Furthermore, one end of the spring layer extends into the tip.

[0019] Furthermore, the cross-sectional shape of the threaded wire can be circular, elliptical, square, triangular, or trapezoidal.

[0020] The beneficial effect of this application is that it provides a microcatheter that effectively improves the pushing force and torque of the microcatheter. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0022] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0023] In the attached diagram:

[0024] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0025] Figure 2 This is a cross-sectional view of an embodiment, mainly showing the transition section structure.

[0026] Figure label:

[0027] 1. Tube body; 2. Balloon; 3. Tip; 4. Guide wire channel; 5. Inflation channel; 6. Pressure pump; 7. Rotating cap; 8. Threaded wire; 9. Transition section; 10. Inner layer; 11. Braided layer; 12. Outer layer; 13. Spring layer. Detailed Implementation

[0028] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0029] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0030] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0031] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0032] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Reference Figure 1-2 The microcatheter includes a tube body 1, a balloon 2, a tip 3, a guidewire channel 4, an inflation channel 5, a pressure pump 6, and a rotating cap 7. The tube body 1 has a guidewire channel 4 and an inflation channel 5, which are connected end-to-end to allow the guidewire to pass through. The balloon 2 is mounted on the outer wall of the tube body 1. The tip 3 is located at the end of the tube body 1 near the balloon 2. The pressure pump 6 is located at one end of the inflation channel 5, and the synchronous channel is connected to the balloon 2 for inflation. The rotating cap 7 is fixed to the tube body 1. At least one threaded wire 8 is wound around the tip 3, with both ends welded to the tip 3 and the tube body 1, respectively. The rotating cap 7 drives the tube body 1 to rotate, which in turn drives the threaded wire 8 to rotate, effectively increasing the pushing force and torque of the microcatheter. This makes the microcatheter easier to twist and advance, facilitating its entry into the lesion area. This ensures that the balloon 2 effectively inflates and expands the lesion area, reducing surgical time and costs.

[0034] Balloon 2 is cone-shaped to facilitate its entry into the lesion area.

[0035] The outer diameter of the tip 3 gradually decreases from one end near the tube body 1 to the other. This reduces the difficulty of the microcatheter entering the lesion area, while also increasing the pushing force and torque of the microcatheter.

[0036] The cross-sectional shape of the threaded wire 8 can be circular, elliptical, square, triangular, or trapezoidal.

[0037] The guide wire channel 4 has a transition section 9 at one end of the tip 3. The inner diameter of the transition section 9 gradually decreases from one end near the tube body 1 to the other end. The change in the inner diameter of the transition section 9 provides some space for the wall thickness of the tip 3, allowing the wall thickness of the tip 3 to increase under the same outer diameter. The flexibility of the tip 3 decreases as the wall thickness increases, reducing the difference in flexibility at the junction of the tip 3 and the tube body 1, and enhancing the tip 3's resistance to bending.

[0038] The tube body 1, extending outward from the guide wire channel 4, comprises an inner layer 10, a braided layer 11, and an outer layer 12. A spring layer 13 is provided between the inner layer 10 and the braided layer 11, extending into the tip 3. The length of the spring layer 13 may exceed or not exceed the braided layer 11. To enable the guide wire to slide smoothly within the guide wire channel 4, the inner layer 10 is preferably made of a material with good lubricity, such as polytetrafluoroethylene (PTFE). The outer layer 12 is made of a soft polymer material, such as PA, PU, ​​Pebax, etc. The braided layer 11 is made of stainless steel, fiber, or nickel-titanium alloy, and is woven into a mesh structure or a single-thread winding structure. The braided layer 11 is laid between the inner layer 10 and the outer layer 12, which can improve the tensile strength of the tube body 1. To further reduce the flexibility difference at the junction of the tip 3 and the tube body 1, one end of the braided layer 11 extends into the tip 3. In the proximal portion of the tip 3, the presence of the braided layer 11 enhances its rigidity and reduces its flexibility, improving the abrupt transition in flexibility from the distal end of the tube body 1 to the proximal end of the tip 3, mitigating stress concentration, and enhancing the overall tensile and bending resistance of the microcatheter. The spring layer 13 is made of stainless steel wire, fiber, or nickel-titanium alloy. During the use of the microcatheter, operations such as twisting are required. When the tip 3 is stuck in a narrow area, continuous external torque input can cause the spring layer 13, located outside the braided layer 11 at the distal end of the tube body 1, to unravel when twisted in a certain direction. Placing the braided layer 11 outside the spring layer 13 prevents torsional stress concentration from causing the spring layer 13 to unravel.

[0039] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A microcatheter, characterized by: include: The tube body has a guide wire channel and an inflation channel; A balloon is fitted over the outside of the tube body; The tip is located at one end of the tube body near the balloon. The guide wire channel is arranged to pass through the front and rear to allow the guide wire to pass through. One end of the inflation channel is equipped with a pressure pump. One end of the inflation channel is connected to the balloon to inflate the balloon. At least one threaded wire is wound on the tip. A rotating cap is fixed on the tube body.

2. The microcatheter according to claim 1, characterized in that: The two ends of the threaded wire are welded to the tip and the tube body, respectively.

3. The microcatheter according to claim 1, characterized in that: The balloon is cone-shaped.

4. The microcatheter according to claim 1, characterized in that: The outer diameter of the tip gradually decreases from one end near the tube body to the other end.

5. The microcatheter according to claim 1, characterized in that: The guidewire channel has a transition section at one end of the tip.

6. The microcatheter according to claim 5, characterized in that: The inner diameter of the transition section gradually decreases from one end near the tube body to the other end.

7. The microcatheter according to claim 5, characterized in that: The tube body comprises an inner layer, a braided layer, and an outer layer in sequence from the guide wire channel outwards, with one end of the braided layer extending into the tip.

8. The microcatheter according to claim 7, characterized in that: A spring layer is provided between the inner layer and the braided layer.

9. The microcatheter according to claim 8, characterized in that: One end of the spring layer extends into the tip.

10. The microcatheter according to claim 1, characterized in that: The cross-sectional shape of the threaded wire is circular, elliptical, square, triangular, or trapezoidal.

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