Bending-controllable micro catheter
By introducing a hyaluronic acid tube structure and a contrast ring design into the controllable bending microcatheter, the problems of poor distal support and reduced bending ability were solved, enabling efficient delivery and flexible control in complex blood vessels and improving surgical efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CARDIOLINK SCI (SHENZHEN) MEDICAL TECH DEV CO LTD
- Filing Date
- 2024-12-27
- Publication Date
- 2026-05-05
AI Technical Summary
Existing controllable bending microcatheters have problems during use, such as poor distal support, decreased tip bending ability and limited bending function when passing through extremely tortuous or continuously tortuous blood vessels.
The device employs an inner tube, a first reinforcing layer, an operating mechanism, a second reinforcing layer, and an outer tube structure arranged from the inside out. By introducing a hollow structure in the reinforcing layer using a sodium hypochlorite tube, the bending performance and support of the microcatheter are enhanced. Flexible control of the distal bending section is achieved through the cooperation of the operating wire and the imaging ring.
It improves the support and delivery capabilities of microcatheters in extremely tortuous or continuously tortuous vascular morphologies, ensuring flexible bending and rapid straightening of the distal tip, and reducing surgical time and instrument consumption.
Smart Images
Figure CN224193917U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more specifically, to a controllable bending microcatheter. Background Technology
[0002] Interventional catheters, such as microcatheters, guiding catheters, catheter sheaths, and angiography catheters, are essential auxiliary or diagnostic tools in interventional procedures. They assist other therapeutic instruments or reagents in precisely reaching the designated lesion location. When using interventional catheters to assist other therapeutic instruments or reagents in reaching the designated lesion location, the catheter needs to be advanced from the puncture site along the tortuous shape of the blood vessel to the lesion location. During this process, conventional interventional catheters often struggle to reach the designated lesion location when encountering complex vascular tortuosity. A common practice is to pre-shape conventional interventional catheters into different tortuous shapes, such as mountain sheaths, shuttle sheaths, and bent sheaths. However, when treating multiple vascular diseases or diseases with complex vascular anatomy, a large number of catheters need to be prepared, increasing instrument consumption and surgical time.
[0003] The advent of controllable bending microcatheters has greatly improved the above-mentioned problems. The distal section of the controllable bending microcatheter can be bent in a controlled manner, avoiding the need to spend a lot of time during surgery navigating tortuous blood vessels and inserting vascular branches. However, existing controllable bending microcatheters have problems such as a gradual decrease in bending ability with use, lag in bending adjustment, poor distal support, decreased tip bending ability when navigating extremely tortuous or continuously tortuous blood vessel morphologies, and limited bending function. Utility Model Content
[0004] The purpose of this application is to provide a controllable bending microcatheter to improve problems such as poor distal support, decreased tip bending ability, and limited bending function when passing through extremely tortuous or continuously tortuous vascular morphologies.
[0005] This application provides a controllable bending microcatheter, which includes an inner tube, a first reinforcing layer, an operating mechanism, a second reinforcing layer, and an outer tube arranged sequentially from the inside to the outside.
[0006] The microcatheter also includes a proximal main body segment and a distal curved segment arranged sequentially from the proximal end to the distal end. The distal curved segment is provided with a first radiopaque ring near the distal end and a second radiopaque ring near the proximal end.
[0007] The operating mechanism includes an operating tube and an operating wire. The operating tube is located between the first reinforcing layer and the second reinforcing layer and extends from the proximal end of the microcatheter to the first imaging ring. The operating wire passes through the operating tube and the distal end of the operating wire is connected to the first imaging ring.
[0008] Both the first and second reinforcing layers extend from the proximal end of the microcatheter to the first imaging ring; at least one of the first and second reinforcing layers includes a hypotube.
[0009] In the above implementation process, a hypotube is introduced by at least one of the first reinforcing layer and the second reinforcing layer. The hypotube has a hollow structure, which makes the microcatheter have excellent bending performance. Furthermore, due to the high strength of the hypotube, the deflection and pushing transmission capacity of the bending section are stronger, thus enabling the microcatheter tip to maintain greater bending force to pass through extremely tortuous or continuously tortuous vascular morphologies. Attached Figure Description
[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0011] Figure 1 This is a schematic diagram of the structure of a controllable bending microcatheter provided in one embodiment of this application;
[0012] Figure 2 A longitudinal sectional view of a controllable bending microcatheter provided in one embodiment of this application;
[0013] Figure 3 for Figure 2 Cross-sectional view of the mid-distal curved segment in BB;
[0014] Figure 4 for Figure 2 Cross-sectional view of the mid-proximal main body segment at AA;
[0015] Figure 5 A longitudinal sectional view of a controllable bending microcatheter provided in another embodiment of this application;
[0016] Figure 6 for Figure 5 Cross-sectional view of the mid-distal curved segment in BB;
[0017] Figure 7 for Figure 5 Cross-sectional view of the mid-proximal main body segment at AA;
[0018] Figure 8 A three-dimensional structural schematic diagram of a submersible tube provided in one embodiment of this application;
[0019] Figure 9 for Figure 8 A schematic diagram of a partial planar structure of the sodium hypochlorite tube shown;
[0020] Figure 10 This is a schematic diagram illustrating the engagement of a connecting protrusion and a connecting groove according to one embodiment of this application;
[0021] Figure 11 This is a schematic diagram of the structure of a submersible tube provided in another embodiment of this application;
[0022] Figure 12 for Figure 11 A schematic diagram of the sub-tube structure of a sodium hypochlorite tube;
[0023] Figure 13 This is a schematic diagram showing the engagement of the connecting protrusions and connecting grooves on both sides of the hyaluronic acid tube when it is bent, according to another embodiment of this application.
[0024] Reference numerals: 10-Proximal main body section; 20-Distal curved section; 30-Inner tube; 40-First reinforcing layer; 5-Operating mechanism; 50-Operating tube; 51-First operating tube; 52-Second operating tube; 60-Operating wire; 61-First operating wire; 62-Second operating wire; 70-Second reinforcing layer; 71-First sub-reinforcing layer; 72-Second sub-reinforcing layer; 81-First developing ring; 82-Second developing ring; 90-Outer tube; 100-Thiopanthium tube; 110-Thiopanthium tube sub-tube; 110a-First Thiopanthium tube sub-tube; 110b-Second Thiopanthium tube sub-tube; 110c-Third Thiopanthium tube sub-tube; 110d-Fourth Thiopanthium tube sub-tube; 111-Connecting protrusion; 112-Connecting groove; 120-Thiopanthium tube main body; 130-Thiopanthium tube hollowed-out part. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] To effectively improve the distal support performance of controllable bending microcatheters and enhance their tip bending capability when navigating extremely tortuous or continuously tortuous vascular morphologies, this application provides a controllable bending microcatheter, which will be described in detail below with reference to the accompanying drawings. Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a controllable bending microcatheter provided in one embodiment of this application; wherein, the microcatheter includes a proximal main body segment 10 and a distal bending segment 20 arranged sequentially from the proximal end to the distal end. It can be understood that the proximal end and the distal end are relative to the operator operating the microcatheter. In this application, the proximal end of any component is represented as the end closer to the operator during the surgical operation, and its distal end is represented as the end farther away from the operator during the surgical operation.
[0029] See also Figure 1 The distal curved segment 20 is provided with a first radiopaque ring 81 near the distal end and a second radiopaque ring 82 near the proximal end; this application defines the distal curved segment 20 by the first radiopaque ring 81 and the second radiopaque ring 82, so that the microcatheter can achieve bending of the distal curved segment 20 to one side (e.g. Figure 1 When bending to the left or right (as shown), the development can be monitored through two developing rings.
[0030] Refer to Figure 2. Figure 2 This is a longitudinal sectional view of a controllable bendable microcatheter provided in one embodiment of this application; the microcatheter includes an inner tube 30, a first reinforcing layer 40, an operating mechanism 5, a second reinforcing layer 70, and an outer tube 90 arranged sequentially from the inside to the outside; wherein, the operating mechanism 5 includes an operating tube 50 and an operating wire 60, the operating tube 50 is disposed between the first reinforcing layer 40 and the second reinforcing layer 70, and extends from the proximal end of the microcatheter to the first imaging ring 81, the operating wire 60 passes through the operating tube 50, and the distal end of the operating wire 60 is connected to the first imaging ring 81; both the first reinforcing layer 40 and the second reinforcing layer 70 extend from the proximal end of the microcatheter to the first imaging ring 81; at least one of the first reinforcing layer 40 and the second reinforcing layer 70 includes a sodium hypochlorite tube 100.
[0031] The inner tube 30 and the outer tube 90 are fused together. The innermost layer of the inner tube 30 can be made of PTFE material, and the outermost layer of the outer tube 90 can be made of nylon elastomer material. The outer tube 90 is penetrated into the gaps of the inner layers of the structure through a hot-melt process.
[0032] Both the first imaging ring 81 and the second imaging ring 82 are fused within the outer tube 90. The first imaging ring 81 and the second imaging ring 82 are made of platinum, platinum-tungsten alloy, platinum-iridium alloy, or gold, and are circular in shape. The first imaging ring 81 is designed to be visible during operation of the controllable bending microcatheter; it also serves to fix the distal end of the operating wire 60; simultaneously, the first imaging ring 81 presses against the first reinforcing layer 40 and the inner tube 30, with the outer tube 90 fused to the first imaging ring 81. When the operating wire 60 is pulled, most of the load on the operating wire 60 is transferred to the first imaging ring 81, which then directly distributes the load to the outer tube 90, the inner tube 30, and the first reinforcing layer 40, thereby achieving bending of the distal bending segment 20 of the controllable bending microcatheter when the operating wire 60 is pulled. The second imaging ring 82 is designed to facilitate the positioning of the controllable bending microcatheter during operation. With the combined positioning effect of the first imaging ring 81 and the second imaging ring 82, the position of the distal end of the controllable bending microcatheter during operation can be determined. Furthermore, the second imaging ring 82 presses against the distal end of the second reinforcing layer 70, the operating tube 50, the first reinforcing layer 40, and the inner tube 30, which improves the maneuverability of the controllable bending microcatheter and enhances torque consistency.
[0033] In some embodiments, two operating mechanisms may be configured, respectively disposed on opposite sides of the outer side of the inner tube 30 and fused within the outer tube 90. It is understood that the number of operating mechanisms can be selected according to actual conditions, and preferably evenly distributed on the outer side of the inner tube 30. The operating tube 50 extends from the proximal end of the outer tube 90 to the first developing ring 81, and the second reinforcing layer 70 extends from the proximal end of the outer tube 90 to the second developing ring 82. The operating tube 50 is located inside the second reinforcing layer 70, which contacts the outer surface of the operating tube 50 along its extension length and wraps around and positions the operating tube 50 from its outer surface, thereby fixing the operating tube 50, preventing displacement, and ensuring the relative position of the operating tube 50 on the outer tube 90. The components are: outer tube 90, inner tube 30, operating tube 50, and second reinforcing layer 70. Layer 70, the first imaging ring 81, and the second imaging ring 82 are fused together. The second reinforcing layer 70 enhances the stiffness of the controllable bending microcatheter from the proximal end to the second imaging ring 82, giving the controllable bending microcatheter better support and tensile strength. This allows for a 1:1 torque transmission from the proximal to the distal end of the controllable bending microcatheter. When the operating wire 60 is pulled, the distal end of the controllable bending microcatheter can be flexibly controlled to bend up and down. After the operating wire 60 is released, it can also return to its original position quickly and synchronously, thereby improving the bending flexibility and passage of the controllable bending microcatheter. The operating tube 50 can be made of PTFE or PI material, and the operating wire 60 can be made of stainless steel wire, tungsten wire, nickel-titanium alloy wire, or other metal materials. One end of the operating wire 60 is connected to the first imaging ring 81. The traction applied to the operating wire 60 by the control end drives the first imaging ring 81, causing the distal bending section 20 to bend. The operating wires 60 on both sides can cause the microcatheter to bend up to 180° in both directions.
[0034] Furthermore, the operating tube 50 includes a first operating tube 51 and a second operating tube 52, and the operating wire 60 includes a first operating wire 61 and a second operating wire 62, which are respectively disposed within the first operating tube 51 and the second operating tube 52. The first operating tube 51 and the second operating tube 52 extend from the proximal end of the outer tube 90 to the first developing ring 81, providing a passage for the first operating wire 61 and the second operating wire 62 from the proximal end of the outer tube 90 to the first developing ring 81. The first operating tube 51 and the second operating tube 52 are disposed in the same diametrical direction of the outer tube 90 and are symmetrically arranged with respect to the center of the outer tube 90. That is, the first operating tube 51 and the second operating tube 52 are arranged at 180 degrees. The inner diameter of the first operating tube 51 is larger than that of the first operating wire 61, and the inner diameter of the second operating tube 52 is larger than that of the second operating wire 62, so as to reduce the friction between the operating tube 50 and the operating wire 60 to a certain extent. The distal end of the controllable bendable microcatheter can be bent upwards or downwards by tightening or loosening the first operating wire 61 or the second operating wire 62 located within the first operating tube 51 and the second operating tube 52. Specifically, pulling one side of the operating wire 60 will cause the distal end of the controllable bendable microcatheter to bend towards the side that is being pulled. For example, if the first operating wire 61 is located above the second operating wire 62, pulling the first operating wire 61 will cause the distal end of the controllable bendable microcatheter to bend upwards; pulling the second operating wire 62 will cause the distal end of the controllable bendable microcatheter to bend downwards.
[0035] The first reinforcing layer 40 and the second reinforcing layer 70 are coaxially fused within the outer tube 90. The first reinforcing layer 40 is tightly bonded to the inner tube 30. The first reinforcing layer 40 extends from the proximal end of the outer tube 90 to the first imaging ring 81, where it is welded to the first imaging ring 81, thus increasing the rigidity of the outer tube 90 and the inner tube 30 and improving tensile strength. When the operating wire 60 is pulled proximally, it indirectly pulls the first imaging ring 81 through the operating tube 50. The first imaging ring 81 causes the distal end of the controllable bending microcatheter to bend. The operating tube 50 is sandwiched between the second reinforcing layer 70 and the first reinforcing layer 40. The second reinforcing layer 70 extends from the proximal end of the outer tube 90 to the second imaging ring 82, where it partially adheres to the first reinforcing layer 40 and is fused to the outer tube 90. The first reinforcing layer 40 extends from the proximal end to the distal end of the inner tube 30, where it partially adheres to the second reinforcing layer 70. The second reinforcing layer 70 and the first reinforcing layer 40 wrap around and position the operating tube 50 from its inner and outer surfaces. Outside the operating tube 50, the second reinforcing layer 70 and the first reinforcing layer 40 can adhere together. Besides positioning the operating tube 50, this also improves the maneuverability of the controllable bending microcatheter. When the distal end of the controllable bending microcatheter is rotated, the entire controllable bending microcatheter can rotate or bend synchronously. The first reinforcing layer 40 and the second reinforcing layer 70 can be entirely composed of the thiocyanate tube 100, or they can be partially composed of a mesh structure with a metal wire braiding structure. The material of the metal wire braiding structure can be tungsten, stainless steel, nickel-titanium alloy, or other metals. The material of the thiocyanate tube 100 can be nickel-iron alloy, stainless steel, or other metals.
[0036] In this embodiment, the controllable bending microcatheter introduces a hyaluronic acid tube 100 into at least one of the first reinforcing layer 40 and the second reinforcing layer 70. By introducing the hyaluronic acid tube structure into the double reinforcing layers, the support of the distal bending segment of the controllable bending microcatheter can be enhanced, so that the distal bending segment has a stronger pushing and transmission ability during vascular delivery.
[0037] In one optional embodiment, the second reinforcing layer 70 includes a thiocyanate tube structure, and the first reinforcing layer 40 includes a wire braided structure or a spring tube structure. In this embodiment, the outer reinforcing layer is provided with a thiocyanate tube structure, which gives the distal end of the controllable bending microcatheter stronger support and flexibility. In another optional embodiment, the first reinforcing layer 40 includes a thiocyanate tube structure, and the second reinforcing layer 70 includes a wire braided structure or a spring tube structure; or, both the first reinforcing layer 40 and the second reinforcing layer 70 include a thiocyanate tube structure, thus giving the microcatheter stronger torsional properties.
[0038] It should be noted that the inclusion of a sodium hypochlorite tube structure in the first reinforcing layer 40 or the second reinforcing layer 70 of this application means that the entire reinforcing layer can be a sodium hypochlorite tube structure, or a portion thereof can be a sodium hypochlorite tube structure.
[0039] In one alternative embodiment, such as Figures 2 to 4 As shown, Figure 2 This is a longitudinal sectional view of a controllable bending microcatheter provided in one embodiment of this application. The first reinforcing layer 40 is entirely a braided metal wire structure. For details, see [link to relevant documentation]. Figure 3 and Figure 4 The first reinforcing layer 40 has a metal wire braided structure in both the proximal main body section 10 and the distal curved section 20. This metal wire braided structure is evenly distributed on the outside of the inner tube 30, presenting a shape like... Figure 3 and Figure 4 The cross-sectional structure shown; the second reinforcing layer 70 includes a first sub-reinforcing layer 71 disposed in the near-end main body section 10 and a second sub-reinforcing layer 72 disposed in the far-end curved section 20. The first sub-reinforcing layer 71 is a metal wire braided structure and the second sub-reinforcing layer 72 is a hyaluronic acid tube 100.
[0040] See also Figure 3 As shown, the portion of the second reinforcing layer 70 at the distal curved section 20 is the second sub-reinforcing layer 72, which has a sub-tube structure; and as... Figure 4 As shown, the portion of the second reinforcing layer 70 near the main body section 10 is a first sub-reinforcing layer 71, wherein the first sub-reinforcing layer 71 is a metal wire braided structure; Figure 3 and Figure 4 It is evident that the first sub-reinforcing layer 71 and the second sub-reinforcing layer 72 belong to different regions within the same membrane structure. They differ not only in material structure but also in shape. Figure 4 The first sub-reinforcing layer 71 shown is a metal wire braided structure and needs to be attached to the outside of the first reinforcing layer 40 on the outer wall of the inner tube 30 and the outside of the operating tube 50; therefore, the cross-sectional structure of the first sub-reinforcing layer 71 is similar to an ellipse. Figure 3 The second sub-reinforcing layer 72 shown is a sodium thiosulfate tube structure. Since the sodium thiosulfate tube structure is cylindrical and has a certain strength, although the sodium thiosulfate tube is located on the outside of the operating tube 50, it is not in close contact with the outside of the first reinforcing layer 40. Therefore, the cross-sectional structure of the second sub-reinforcing layer 72 is similar to a circle.
[0041] The configuration of this embodiment enables the proximal main body segment 10 to have better rigidity, thereby enabling the controllable bending microcatheter to have better delivery performance, while also ensuring that the distal bending segment 20 has better bendability, thereby enabling the controllable bending microcatheter to have better torsional performance.
[0042] In another alternative embodiment, such as Figures 5 to 7 As shown, Figure 5 This is a longitudinal sectional view of a controllable bending microcatheter provided in another embodiment of this application. The first reinforcing layer 40 is entirely a braided metal wire structure, and the second reinforcing layer 70 is entirely a thiocarbide tube 100 structure; for details, please refer to [link to relevant documentation]. Figure 6 As shown, the first reinforcing layer 40 has a wire braided structure in the distal bending section 20, and the second reinforcing layer 70 has a hygroscopic tube structure in the distal bending section 20; while as Figure 7 As shown, the first reinforcing layer 40 has a braided metal wire structure in the proximal main body section 10, and the second reinforcing layer 70 has a thiocyanate tube structure in the proximal main body section 10. This design enables both the proximal main body section 10 and the distal curved section 20 to have good flexibility, thereby giving the entire controllable bending microcatheter good torsional performance.
[0043] The above describes the specific situation where the second reinforcing layer 70 is entirely or partially made of sodium hypochlorite. At the same time, when the first reinforcing layer 40 is entirely or partially made of sodium hypochlorite, the relevant description of the second reinforcing layer 70 can be referred to.
[0044] Understandably, the hyaluronic acid tube 100 has a hollow structure. This application introduces the hyaluronic acid tube structure through a double-layer reinforcing layer, which enables the microcatheter to have excellent bending performance. By utilizing the good support and flexibility of the hyaluronic acid tube 100, the distal bending section of the microcatheter can maintain good support and deflection, thereby enabling the controllable bending microcatheter to maintain excellent support and delivery performance in extremely tortuous or continuously tortuous vascular morphologies.
[0045] In this embodiment, the controllable bending microcatheter also includes a control handle, a catheter seat, etc. The inner tube 30 is fused inside the outer tube 90, which includes one or more secondary lumens. The inner wall of the inner tube 30 forms a main lumen. In use, the main lumen of the inner tube 30 primarily provides a pathway for injecting liquids or other medical devices, and for delivering drugs from the proximal end to the distal end. The operating tube 50 forms a secondary lumen, primarily providing a pathway for the operating wire 60. The proximal ends of both the inner tube 30 and the outer tube 90 are connected to the catheter seat, which is fixed to the control handle. The proximal end of the operating wire 60 is fixed to the control handle, and the distal end of the operating wire 60 is fixed to the first imaging ring 81. Rotating the control handle allows for pulling of the operating wire 60, enabling different degrees and angles of bending at the distal end of the controllable bending microcatheter. The inner tube 30 has the same length as the outer tube 90. The distal to proximal extension lengths of the outer tube 90 and the inner tube 30 are the same. The inner tube 30 and the outer tube 90 are fused together, which can improve the coaxiality of the outer tube 90 and the inner tube 30.
[0046] The structure of the sodium hypochlorite tube is described in detail below with reference to the accompanying drawings. Figures 8 to 13 This is a schematic diagram of the structure of the submersible tube 100 and a portion thereof provided in an embodiment of this application; in an optional embodiment, such as... Figures 8-9 As shown, Figure 8 This is a three-dimensional structural diagram of a submersible tube according to one embodiment of this application. Figure 9 for Figure 8The diagram shows a partial planar structure of a sodium hypochlorite tube. The sodium hypochlorite tube 100 includes multiple interlocking sub-tubes 110. Two adjacent sodium hypochlorite tubes 110 include a first sodium hypochlorite tube 110a and a second sodium hypochlorite tube 110b. (Please refer to...) Figure 9 One end of the first sub-tube 110a is provided with a connecting protrusion 111, and one end of the second sub-tube 110b is provided with a connecting groove 112 that can fit into the connecting protrusion 111. Multiple sub-tubes 110 can be movably fitted together end to end through the connecting protrusion 111 and the connecting groove 112.
[0047] The movable fit means that there is a margin between the connecting protrusion 111 and the connecting groove 112, that is, there is a gap between the mating connecting protrusion 111 and the connecting groove 112. This margin / gap allows for the offset between the two connected sub-tubes 110.
[0048] By connecting the protrusion 111 and the groove 112, the connection between two adjacent sub-tubes 110 is achieved, which can better realize the bending of the distal bending section 20 of the controllable bending microcatheter.
[0049] Please continue reading. Figure 9 In some embodiments, the connecting protrusion 111 and the connecting groove 112 are at least partially arc-shaped, and the arc radius R1 of the connecting protrusion 111 is smaller than the arc radius R2 of the corresponding connecting groove 112.
[0050] In this embodiment, the mating portion, at least partially consisting of an arc-shaped connecting protrusion 111 and a connecting groove 112, allows for better bending of the distal bending segment 20 of the controllable bending microcatheter in various directions. By setting the arc radius R1 of the connecting protrusion 111 to be smaller than the corresponding arc radius R2 of the connecting groove 112, a gap space exists between the connecting protrusion and the connecting groove in the mating state, allowing for flexible multi-angle bending. A schematic diagram showing the engagement of the connecting protrusion 111 and the connecting groove 112 on the outer side of the bent portion of the microcatheter when it bends can be found in [reference needed]. Figure 10 State 3 and Figure 13 In the schematic diagram on the left, in the bent state, the gap between the connecting protrusion 111 and the connecting groove 112 on the outer side of the bent part increases due to the tensile force. At the same time, the connecting protrusion 111 is still stuck in the opening of the connecting groove 112. It should be noted that the arc diameter of the connecting protrusion 111 is larger than the opening width of the connecting groove so that the connecting protrusion 111 is fitted inside the connecting groove 112 to avoid detachment.
[0051] When the microcatheter bends, a schematic diagram showing the engagement of the connecting protrusion 111 and the connecting groove 112 on the inner side of the bend can be found in [reference needed]. Figure 10 State 2 and Figure 13The diagram on the right shows the situation when the microcatheter is bent. Due to the compressive force on the inner side of the bent portion, the gap between the bottom of the connecting protrusion 111 and the top of the connecting groove 112 decreases or even disappears completely. At this time, a certain gap exists on both sides of the connecting protrusion 111 and the connecting groove 112. It should be noted that when the microcatheter bends to a certain extent, different positions on the outer side of the microcatheter experience varying degrees of tension, and similarly, different positions on the inner side of the microcatheter experience varying degrees of compression. This results in differences in the fit between the connecting protrusion and the connecting groove, as well as the size of the gap between them. For a schematic diagram of the fit between the connecting protrusion 111 and the connecting groove 112 when the microcatheter is not bent, please refer to [reference needed]. Figure 10 State 1.
[0052] Furthermore, along the extending direction of the wave tube 110, at least a portion of the width of the outer end of the connecting protrusion 111 is greater than the width of its inner end. This results in higher reliability of the connection between the wave tubes 110. Even further, both the connecting protrusion 111 and the connecting groove 112 can be teardrop-shaped. It is understood that in other embodiments, the connecting protrusion 111 and the connecting groove 112 can also be T-shaped, trapezoidal, triangular, etc.
[0053] In some embodiments, each sub-tube of the sub-tube 100 is provided with a connecting protrusion 111 and a connecting groove 112 in the circumferential direction of the sub-tube 100, and two adjacent sub-tubes of the sub-tube 100 can be movably fitted together by the connecting protrusion 111 and the connecting groove 112. This design allows the sub-tube to achieve bending performance at multiple angles in the circumferential direction.
[0054] Figure 8 The diagram shows that the sub-tubes of the sodium hypochlorite tube are evenly distributed in the structure. Specifically, the connecting protrusions 111 and the connecting grooves 112 are evenly distributed in the circumferential direction of the sodium hypochlorite tube 100.
[0055] In some optional embodiments of this application, the sub-tubes of the sodium hypochlorite tube structure are non-uniformly distributed; please refer to [link to relevant documentation]. Figure 12 Along the direction of extension of the microcatheter, the sub-tube 110 includes a sub-tube body 120 and a hollowed-out portion 130 connected to the sub-tube body 120. The sub-tube body 120 is a solid structure. The hollowed-out portion 130 includes a connecting protrusion 111 and a connecting groove 112. The sub-tube 100 includes a third sub-tube 110c near the distal end and a fourth sub-tube 110d near the proximal end. The hollowed-out portion of the third sub-tube 110c has a higher hollowed-out portion than the hollowed-out portion of the fourth sub-tube 110d.
[0056] It is understandable that the third and fourth sub-tubes of the hysteresis tube can be adjacent or not. In other words, the changes in each sub-tube 110 are not sequential, but rather occur only after several sub-tubes.
[0057] In this embodiment, by controlling the perforation density of the third sub-tube at the more distal end to be higher than that of the fourth sub-tube, the degree of perforation near the distal end of the sub-tube is greater than that near the proximal end. This enhances the bending performance of the distal bending section and the support performance of the proximal main body section, ultimately giving the controllable bending microcatheter stronger deflection and pushing and transmitting capabilities.
[0058] This application will now describe, with reference to the accompanying drawings, a specific design method in which the degree of perforation near the distal end of the sodium hydroxide tube is greater than that near the proximal end. In some optional embodiments, such as... Figure 11 As shown, the length L1 of the main body of the third sub-tube 110c is less than the length L2 of the main body of the fourth sub-tube 110d.
[0059] This application, through its embodiments, controls the length L1 of the main body of the third sub-tube of the sub-tube at the more distal end to be less than the length L2 of the main body of the fourth sub-tube of the sub-tube. In other words, the sub-tubes near the distal end are shorter, and the sub-tubes near the proximal end are longer. This results in a higher density of sub-tubes near the distal end, which means a greater degree of perforation in the sub-tubes near the distal end. This makes the degree of perforation at the distal end of the sub-tube greater than that at the proximal end, thus enabling the controllable bending microcatheter to achieve a smaller bend at the distal end.
[0060] It is understood that, in some other embodiments, the length of the main body of all the sub-tubes 110 of the entire sub-tube 100 may also be the same. Please refer to [link to relevant documentation]. Figure 8 and Figure 9 This application does not impose specific limitations.
[0061] In some alternative embodiments, such as Figure 12 As shown, the radius of the arc R3 of the connecting protrusion 111 of the third sub-tube 110c is smaller than the radius of the arc R4 of the connecting protrusion 111 of the fourth sub-tube 110d.
[0062] In this embodiment, by controlling the arc radius R1 of the connecting protrusion 111 of the third sub-tube at the more distal end to be smaller than the arc radius R2 of the connecting protrusion 111 of the fourth sub-tube, the controllable bending microcatheter can achieve more precise and smaller bending in the circumferential direction at the distal end.
[0063] It is understood that, in some embodiments, the radius of curvature of the connecting protrusions 111 of all sub-tubes 110 of the entire sub-tube 100 may be the same. Please refer to [link to relevant documentation]. Figure 8 and Figure 9 This application does not impose specific limitations.
[0064] In some embodiments, the number N1 of connecting protrusions 111 on at least one side of the third sub-tube is greater than the number N2 of connecting protrusions 111 on at least one side of the fourth sub-tube. See also Figure 12 .
[0065] In this embodiment of the application, by controlling the number N1 of the connecting protrusions 111 on at least one side of the third sub-tube at a more distal end to be greater than the number N2 of the connecting protrusions 111 on at least one side of the fourth sub-tube, the controllable bending microcatheter can be bent more precisely and smaller at its distal end in the circumferential direction.
[0066] It is understood that, in some embodiments, the number of connecting protrusions 111 of all the sub-tubes 110 of the entire sub-tube 100 may be the same; please refer to [link to relevant documentation]. Figure 8 and Figure 9 This application does not impose specific limitations.
[0067] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A controllable bending microcatheter, characterized in that, The microcatheter comprises, from the inside out, an inner tube, a first reinforcing layer, an operating mechanism, a second reinforcing layer, and an outer tube; The microcatheter also includes a proximal main body segment and a distal curved segment arranged sequentially from the proximal end to the distal end. The distal curved segment is provided with a first radiopaque ring near the distal end and a second radiopaque ring near the proximal end. The operating mechanism includes an operating tube and an operating wire. The operating tube is disposed between the first reinforcing layer and the second reinforcing layer and extends from the proximal end of the microcatheter to the first imaging ring. The operating wire passes through the operating tube, and the distal end of the operating wire is connected to the first imaging ring. Both the first reinforcing layer and the second reinforcing layer extend from the proximal end of the microcatheter to the first radiopaque ring; at least one of the first reinforcing layer and the second reinforcing layer includes a hypotube.
2. The controllable bending microcatheter according to claim 1, characterized in that, The sodium hypochlorite tube includes multiple interlocking sodium hypochlorite tube sub-tubes. Two adjacent sodium hypochlorite tube sub-tubes include a first sodium hypochlorite tube and a second sodium hypochlorite tube. One end of the first sodium hypochlorite tube is provided with a connecting protrusion, and one end of the second sodium hypochlorite tube is provided with a connecting groove that can be fitted with the connecting protrusion. The multiple sodium hypochlorite tubes can be movably fitted together end to end through the connecting protrusion and the connecting groove.
3. The controllable bending microcatheter according to claim 2, characterized in that, The connecting protrusion and the connecting groove are at least partially arc-shaped, and the arc radius R1 of the connecting protrusion is smaller than the arc radius R2 of the corresponding connecting groove.
4. The controllable bending microcatheter according to claim 2, characterized in that, Each of the sub-tubes of the hyaluronic acid tube is provided with a connecting protrusion and a connecting groove along the circumference of the hyaluronic acid tube, and two adjacent sub-tubes of the hyaluronic acid tube can be movably fitted together through the connecting protrusion and the connecting groove.
5. The controllable bending microcatheter according to claim 2, characterized in that, Along the direction of extension of the microcatheter, the sub-tube includes a sub-tube body and a hollowed-out portion connected to the sub-tube body. The sub-tube body is a solid structure, and the hollowed-out portion includes the connecting protrusion and the connecting groove. The sub-tube includes a third sub-tube near the distal end and a fourth sub-tube near the proximal end. The hollowed-out density of the third sub-tube is higher than that of the fourth sub-tube.
6. The controllable bending microcatheter according to claim 5, characterized in that, The length L1 of the main body of the third sub-tube is less than the length L2 of the main body of the fourth sub-tube.
7. The controllable bending microcatheter according to claim 5, characterized in that, The radius of the arc of the connecting protrusion of the third sub-tube is smaller than the radius of the arc of the connecting protrusion of the fourth sub-tube.
8. The controllable bending microcatheter according to claim 5, characterized in that, The number N1 of the connecting protrusions on at least one side of the third sub-tube is greater than the number N2 of the connecting protrusions on at least one side of the fourth sub-tube.
9. The controllable bending microcatheter according to any one of claims 1 to 8, characterized in that, The first reinforcing layer is a metal wire braided structure, and the second reinforcing layer includes the sodium hypochlorite tube.
10. The controllable bending microcatheter according to claim 9, characterized in that, The second reinforcing layer includes a first sub-reinforcing layer disposed on the proximal main body section and a second sub-reinforcing layer disposed on the distal curved section. The first sub-reinforcing layer is a metal wire braided structure, and the second sub-reinforcing layer is the hyaluronic acid tube.