Bending-adjustable catheter and manufacturing method thereof

Abstract

The embodiment of the invention provides an adjustable bent catheter and a manufacturing method thereof, and relates to the technical field of medical instruments. An inner cavity is formed in the catheter body and arranged in the extending direction of the catheter body. The section of the inner cavity is in a regular polygon shape, and a wire pulling cavity is formed in the edge of the regular polygon and arranged in the extending direction of the catheter body. The radius of the circumcircle of the regular polygon is larger than the minimum distance from the center of the inner cavity to the outer diameter of the wire drawing cavity and smaller than or equal to the maximum distance from the center of the inner cavity to the outer diameter of the wire drawing cavity.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an adjustable curved catheter and a manufacturing method thereof. Background Art

[0002] Adjustable curved catheter is a medical device widely used in interventional treatment, mainly used to guide other medical devices (such as guide wires, catheters, electronic components, etc.) or fluids into the human body to reach the target site for diagnosis or treatment. During the operation, the operator adjusts the adjustable curved catheter as needed to adapt to complex anatomical structures and surgical paths, thereby improving the safety and effectiveness of the operation.

[0003] In the related art, an adjustable curved catheter is formed with an inner cavity, and a medical device or a fluid reaches a target part of a human body through the inner cavity, and the cross-section of the inner cavity is usually set to be circular.

[0004] However, since the outer diameter of the adjustable curved catheter is fixed, setting the cross-section of the inner cavity to a circle easily causes the inner cavity space to be limited, and it is often impossible to provide a larger effective inner cavity space under the same outer diameter conditions, making it difficult to accommodate more medical devices or transmit more fluids. Summary of the invention

[0005] The embodiments of the present application provide an adjustable curved catheter and a method for manufacturing the same to solve the technical problem in the related art that the inner cavity space is limited and it is often impossible to provide a larger effective inner cavity space under the same outer diameter condition, thus making it difficult to accommodate more medical devices or transmit more fluids.

[0006] In a first aspect, an embodiment of the present application provides an adjustable bend catheter, comprising: a catheter body; The catheter body is formed with an inner cavity, and the inner cavity is arranged along the extension direction of the catheter body; The cross-sectional shape of the inner cavity is set to be a regular polygon, a wire pulling cavity is set along the edge of the regular polygon, and the wire pulling cavity is set along the extension direction of the catheter body; wherein, the radius of the circumscribed circle of the regular polygon is greater than the minimum distance from the center of the inner cavity to the outer diameter of the wire pulling cavity, and is less than or equal to the maximum distance from the center of the inner cavity to the outer diameter of the wire pulling cavity.

[0007] In a feasible implementation, the regular polygon is set to be one of a regular quadrilateral, a regular pentagon or a regular hexagon.

[0008] In a feasible implementation, the center of the wire pulling cavity is set along the perpendicular bisector of the regular polygon side.

[0009] In a feasible implementation, the catheter body includes an inner layer, a middle layer and an outer layer from the inside to the outside; An inner cavity is formed in the middle of the inner layer, and the wire drawing cavity is arranged around the inner layer; The inner layer is set to be one of polytetrafluoroethylene material or resin material, the middle layer is set to be metal material, and the outer layer is set to be resin material.

[0010] In a second aspect, the present application also provides a method for manufacturing an adjustable curved conduit, the method for manufacturing an adjustable curved conduit in any technical solution of the first aspect; the method for manufacturing comprises the following steps: An inner layer is arranged around the outer side wall of the mandrel mold to form an initial structure; wherein the cross section of the mandrel mold is arranged to be a regular polygon; Weaving metal braided wires on the outer side walls of the initial structure to form an intermediate structure; A resin tube is sleeved on the outer wall of the middle structure to form a processing structure; The processed structure is heated and formed, and after cooling, the mandrel mold is taken out to form the catheter body of the adjustable bend catheter.

[0011] In a feasible implementation, the inner layer is arranged around the outer wall of the mandrel mold to form an initial structure, which specifically includes the following steps: A tube sleeve made of polytetrafluoroethylene material is sleeved on a mandrel mold to form a first structure, and a support tube is sleeved on an outer wall of the first structure to form an initial structure; Alternatively, a polytetrafluoroethylene coating is coated on the outer wall of the mandrel mold to form a second structure, and a support tube is sleeved on the outer wall of the second structure to form an initial structure; Wherein, the outer side wall of the support tube is provided with a groove, and the groove is arranged along the extension direction of the core shaft mold.

[0012] In a feasible implementation, the inner layer is arranged around the outer wall of the mandrel mold to form an initial structure, which specifically includes the following steps: A tube sleeve made of polytetrafluoroethylene material is placed on a mandrel mold to form an initial structure.

[0013] In a feasible implementation, after the step of arranging the inner layer around the outer side wall of the mandrel mold to form the initial structure, the step further includes: A wire drawing tube is placed in the groove of the support tube; wherein a wire drawing cavity is formed in the wire drawing tube, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

[0014] In a feasible implementation, before the step of weaving metal braided wires on the outer side wall of the initial structure to form the intermediate structure, the step further includes: The wire drawing tubes are respectively arranged on different faces of the regular polygon; wherein the wire drawing tubes form a wire drawing cavity, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

[0015] In a feasible implementation, the processing structure is heated and formed, and the mandrel mold is removed after cooling to form an adjustable curved conduit, which specifically includes: The processed structure is heated and formed, and after cooling, the mandrel mold is taken out, and the draw wire is inserted and fixed to form the catheter body of the adjustable bend catheter.

[0016] In the first aspect, an embodiment of the present application discloses an adjustable curved catheter. In the embodiment of the present application, the cross-sectional shape of the inner cavity is set to a regular polygon, and the radius of the circumscribed circle of the regular polygon is set to be greater than the minimum distance from the center of the inner cavity to the outer diameter of the wire pulling cavity, and less than or equal to the maximum distance from the center of the inner cavity to the outer diameter of the wire pulling cavity. At the same time, the wire pulling cavity is set along the edge of the regular polygon. Compared with setting the inner cavity to a circle, the inner cavity is set to a regular polygon while ensuring that the distance between the inner cavity and the edge of the wire pulling cavity is limited. Under the condition of the same outer diameter of the adjustable curved catheter, the inner cavity space is approximately larger than the area of ​​the regular polygon minus its inscribed circle, thereby greatly increasing the inner cavity space to accommodate more medical devices or transmit more fluids.

[0017] On the second aspect, the embodiment of the present application provides a method for making an adjustable bend catheter. In the embodiment of the present application, since the inner cavity is set to a regular polygon shape, further, the core shaft mold is also set to a regular polygon shape. When setting the wire drawing cavity, since the edges of the regular polygon shape are straight lines, unlike the circular wire drawing cavity, it is not easy to deviate or roll during the fixing process. Therefore, the wire drawing cavity can be better fixed to avoid the wire drawing cavity from tilting along the head and tail of the core shaft mold, and then the catheter bending will be twisted greatly, reducing the bending accuracy. Furthermore, since the method for making an adjustable bend catheter is a method for making an adjustable bend catheter disclosed in all the technical solutions of the first aspect of the present application, the method for making an adjustable bend catheter has the technical effects of all the technical solutions of the first aspect of the present application, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of an adjustable curved conduit in the prior art; Figure 2 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 1 ; Figure 3 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 2 ; Figure 4 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 3 ; Figure 5 This is a schematic diagram of a bending state of an adjustable bending conduit in different directions provided by an embodiment of the present application; Figure 6 The method steps of a method for manufacturing an adjustable curved conduit provided in an embodiment of the present application are as follows: Figure 1 ; Figure 7 is a schematic diagram of the structure of a support tube provided in one embodiment of the present application; Figure 8 The method steps of a method for manufacturing an adjustable curved conduit provided in an embodiment of the present application are as follows: Figure 2 . Description of reference numerals: 100-catheter body; 200-support tube; 110-inner layer; 111-inner cavity; 112-wire cavity; 120-middle layer; 130-outer layer; 210-Groove. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0020] Figure 1 The invention is a structural schematic diagram of an adjustable curved conduit in the prior art.

[0021] Reference Figure 1 The adjustable bend catheter is formed with an inner cavity 111, and a plurality of pull wire cavities 112 are evenly arranged around the outer periphery of the inner cavity 111. One end of the pull wire is fixed to the head of the adjustable bend catheter and passes through the pull wire cavity 112, and the other end extends from the tail of the adjustable bend catheter. Then, the pull wire is pulled to realize the unidirectional or multi-directional bending function, and the medical device or fluid reaches the target part of the human body through the inner cavity 111.

[0022] The cross-section of the inner cavity 111 is usually set to be circular, the outer diameter of the adjustable bend catheter is fixed, and a certain distance is set between the pull wire cavity 112 and the inner cavity 111, which causes the space of the inner cavity 111 to be limited. It is often impossible to provide a larger effective inner cavity 111 space under the same outer diameter conditions, making it difficult to accommodate more medical devices or transmit more fluids.

[0023] Therefore, an embodiment of the present application provides an adjustable curved catheter and a method for manufacturing the same to solve the technical problem in the related art that the inner cavity 111 is limited in space and often cannot provide a larger effective inner cavity 111 space under the same outer diameter condition, making it difficult to accommodate more medical devices or transmit more fluids.

[0024] Figure 2 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 1 ; Figure 3 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 2 ; Figure 4 This is a schematic diagram of the structure of an adjustable curved conduit provided in an embodiment of the present application. Figure 3 ; Figure 5 This is a schematic diagram of the bending states of an adjustable bending conduit in different directions provided by an embodiment of the present application.

[0025] First, refer to Figures 2 to 5 , the embodiment of the present application provides an adjustable bend catheter, comprising: a catheter body 100; The catheter body 100 is formed with an inner cavity 111, and the inner cavity 111 is arranged along the extension direction of the catheter body 100; The cross-sectional shape of the inner cavity 111 is set to be a regular polygon, and a wire pulling cavity 112 is set along the side of the regular polygon, and the wire pulling cavity 112 is set along the extension direction of the catheter body 100; The radius of the circumscribed circle of the regular polygon is greater than the minimum distance from the center of the inner cavity 111 to the outer diameter of the wire pulling cavity 112 , and is less than or equal to the maximum distance from the center of the inner cavity 111 to the outer diameter of the wire pulling cavity 112 .

[0026] It should be noted that the medical device or fluid reaches the target part of the human body through the inner cavity 111. A pull wire is inserted into the pull wire cavity 112, one end of the pull wire is fixed to the head end of the adjustable bend catheter, passes through the pull wire cavity 112, and the other end extends from the tail end of the adjustable bend catheter. Then, the pull wire is pulled to realize the unidirectional or multi-directional bending function.

[0027] Exemplarily, the regular polygon may be set to be one of a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon, and the like.

[0028] Reference Figure 1 The minimum distance from the center of the inner cavity 111 to the outer diameter of the wire drawing cavity 112 is the distance marked by A, and the maximum distance from the center of the inner cavity 111 to the outer diameter of the wire drawing cavity 112 is the distance marked by B. In a specific implementation, when the distance A and the distance B are fixed, that is, when the outer diameter of the adjustable curved catheter is fixed, if the cross section of the inner cavity 111 is set to be circular, then the inner cavity 111 is set to be Figures 2 to 4 The circle marked by M in the figure, the embodiment of the present application sets the cross-sectional shape of the inner cavity 111 to a regular polygon, such as Figure 2 The inner cavity 111 in is a regular quadrilateral. Figure 3 The inner cavity 111 in is a regular pentagon. Figure 4The inner cavity 111 in the figure is a regular hexagon, and the radius of the circumscribed circle of the regular polygon is set to be greater than the minimum distance A from the center of the inner cavity 111 to the outer diameter of the wire drawing cavity 112, and less than or equal to the maximum distance B from the center of the inner cavity 111 to the wire drawing cavity 112. Figure 2 In the figure, N is the circumscribed circle of the regular quadrilateral, and the distance marked by C is the radius of the circumscribed circle of the regular quadrilateral; Figure 3 N is the circumscribed circle of the regular pentagon, and the distance marked by C is the radius of the circumscribed circle of the regular pentagon. Figure 4 N is the circumscribed circle of the regular hexagon, and the distance marked by C is the radius of the circumscribed circle of the regular hexagon; obviously, the space of the inner cavity 111 of the regular polygon is larger than the space of the inner cavity 111 shown by M. In other words, by setting the inner cavity 111 as a regular polygon, and setting the radius of the circumscribed circle of the inner cavity 111 between the distance A and the distance B, the outer diameter of the adjustable curved catheter is fixed, and the wire pulling cavity 112 is avoided, the space of the wire pulling cavity 112 is guaranteed, and the space of the inner cavity 111 is greatly increased.

[0029] In specific implementation, when the radius of the circumscribed circle of the regular polygon is smaller than the minimum distance from the center of the inner cavity 111 to the wire-pulling cavity 112, on the one hand, the space of the inner cavity 111 will be limited, and on the other hand, the distance from the wire-pulling cavity 112 to the inner cavity 111 will be reduced, affecting the strength of the inner cavity 111 and the wire-pulling cavity. When the circumscribed circle of the regular polygon is larger than the maximum distance from the center of the inner cavity 111 to the outer diameter of the wire-pulling cavity 112, the outer diameter of the adjustable elbow will be increased, and the outer diameter of the adjustable elbow cannot be kept fixed.

[0030] From the above description, it can be seen that this solution achieves the following technical effects: Firstly, an embodiment of the present application discloses an adjustable curved catheter, which achieves this by setting the cross-sectional shape of the inner cavity 111 to a regular polygon, and setting the radius of the circumscribed circle of the regular polygon to be greater than the minimum distance from the center of the inner cavity 111 to the outer diameter of the wire pulling cavity 112, and less than or equal to the maximum distance from the center of the inner cavity 111 to the outer diameter of the wire pulling cavity 112. Meanwhile, the wire pulling cavity 112 is arranged along the side of the regular polygon. Compared with setting the inner cavity 111 to a circle, the inner cavity 111 is set to a regular polygon while ensuring that the distance between the edges of the inner cavity 111 and the wire pulling cavity 112 is limited. Under the condition of the same outer diameter of the adjustable curved catheter, the space of the inner cavity 111 is approximately larger than the area of ​​the regular polygon minus the inscribed circle, which not only ensures the space of the wire pulling cavity 112, but also can greatly increase the space of the inner cavity 111 to accommodate more medical devices or transmit more fluids.

[0031] In some examples, the regular polygon is configured as one of a quadrilateral, a pentagon, or a hexagon.

[0032] It should be noted that in the related art, the adjustable bend conduit includes an inner layer 110 , a middle layer 120 and an outer layer 130 , wherein an inner cavity 111 is formed in the middle of the inner layer 110 , and a wire pulling cavity 112 is arranged around the inner layer 110 .

[0033] When the outer diameter of the adjustable curved conduit is 3.0 mm, the thickness of the outer layer 130 is 0.1 mm, the thickness of the middle layer 120 is 0.05 mm, the diameter of the wire pulling cavity 112 is 0.3 mm, and the distance between the wire pulling cavity 112 and the inner cavity 111 is 0.05 mm.

[0034] For example, if the inner cavity 111 is set to be circular, and the circular radius of the inner cavity 111 is set to 2 mm, then the area of ​​the circular inner cavity 111 is:

[0035] Reference Figure 2 , if the inner cavity 111 is set to be a square, and the side length of the square of the inner cavity 111 is set to 2 mm, then the area of ​​the square inner cavity 111 is:

[0036] Compared with setting the inner cavity 111 to be circular, the space improvement rate of setting the inner cavity 111 to be square in the embodiment of the present application is:

[0037] Reference Figure 3 For another example, if the inner cavity 111 is set as a regular pentagon, the distance from the center to the side length of the regular pentagon is 1 mm, and the side length is about 1.45 mm, then the area of ​​the regular pentagon inner cavity 111 is about 3.63 mm 2 .

[0038] Compared with setting the inner cavity 111 as a circle, the space improvement rate of setting the inner cavity 111 as a regular pentagon in the embodiment of the present application is:

[0039] Reference Figure 4 For another example, if the inner cavity 111 is set as a regular hexagon, the distance from the center to the side length of the regular hexagon is 1 mm, and the side length is about 1.15 mm, then the area of ​​the regular hexagon inner cavity 111 is about 3.46 mm 2 .

[0040] Compared with setting the inner cavity 111 as a circle, the space improvement rate of setting the inner cavity 111 as a regular pentagon in the embodiment of the present application is:

[0041] That is to say, through the setting of the embodiment of the present application, under the same outer diameter condition, compared with setting the inner cavity 111 as a circle, the inner cavity 111 is set to one of a regular quadrilateral, a regular pentagon or a regular hexagon in the embodiment of the present application, which can greatly increase the space of the inner cavity 111.

[0042] In some examples, the center of the wire pulling cavity 112 is arranged along the perpendicular bisector of the sides of the regular polygon.

[0043] For example, when the inner cavity 111 is set to a regular quadrilateral, four wire pulling cavities 112 are set, and the four wire pulling cavities 112 correspond to four pull wires. After experimental verification, when any pull wire is pulled, the bending direction of the adjustable bending tube and the azimuth angle error of the pull wire is less than or equal to 2°.

[0044] For another example, when the inner cavity 111 is set to a regular pentagon, five wire pulling cavities 112 are set, and the five wire pulling cavities 112 correspond to five pull wires. After testing and verification, when any pull wire is pulled, the bending direction of the adjustable bending conduit and the azimuth angle error of the pull wire is less than or equal to 3°.

[0045] For another example, when the inner cavity 111 is set as a regular hexagon, six wire pulling cavities 112 are set, and the six wire pulling cavities 112 correspond to six pull wires. After testing and verification, when any pull wire is pulled, the bending direction of the adjustable bending conduit and the azimuth angle error of the pull wire is less than or equal to 3°.

[0046] The embodiment of the present application sets the center of the pull wire cavity 112 along the perpendicular bisector of the side of the regular polygon, that is, there is a pull wire corresponding to the perpendicular bisector of each side of the regular polygon, so as to accurately control the bending direction and angle of the distal end of the adjustable bend catheter, so that the adjustable bend catheter can achieve unidirectional, bidirectional, and multi-directional composite bending functions to meet the needs of complex paths.

[0047] In some other examples, the catheter body 100 includes an inner layer 110, a middle layer 120 and an outer layer 130 from inside to outside; An inner cavity 111 is formed in the middle of the inner layer 110, and a wire pulling cavity 112 is arranged around the inner layer 110; The inner layer 110 is configured to be a polytetrafluoroethylene material or a resin material, the middle layer 120 is configured to be a metal material, and the outer layer 130 is configured to be a resin material.

[0048] In some examples, the outer diameter of the catheter body 100 can be set to 1.0 mm to 10.0 mm. In other words, the outer diameter of the outer layer 130 can be set to 1.0 mm to 10.0 mm.

[0049] Exemplarily, the middle layer 120 is woven from a metal material, wherein the metal material may be stainless steel or nickel-titanium alloy.

[0050] Exemplarily, the resin material in the outer layer 130 may be thermoplastic polyurethane elastomer, nylon elastomer or polyamide, etc., and resin materials of different hardness may be selected according to the functional requirements of different sections of the adjustable curved conduit.

[0051] The embodiment of the present application improves the biocompatibility and low friction of the adjustable bend catheter by setting the inner layer 110 of the adjustable bend catheter to one of polytetrafluoroethylene materials or resin materials, so as to ensure stability during long-term use and smooth fluid transmission. Furthermore, the pull wire cavity 112 is made of polytetrafluoroethylene material, which has the advantages of low friction and small bending force when inserting the pull wire. The embodiment of the present application enhances the tensile strength, compression resistance and bending resistance of the adjustable bend catheter by setting the middle layer 120 of the adjustable bend catheter to a metal braided layer. The embodiment of the present application sets the outer side of the adjustable bend catheter to a resin material, and in the specific implementation, selects resin materials of different hardness according to the functional requirements of different sections of the adjustable bend catheter, thereby ensuring that the adjustable bend catheter has the required flexibility and support in different operating parts.

[0052] In a second aspect, an embodiment of the present application further provides a method for manufacturing an adjustable curved conduit, and the manufacturing method is used to manufacture an adjustable curved conduit in any technical solution of the first aspect.

[0053] Figure 6 The method steps of a method for manufacturing an adjustable curved conduit provided in an embodiment of the present application are as follows: Figure 1 .

[0054] Example 1: Reference Figure 6 , the preparation method comprises the following steps: S1-1: An inner layer 110 is arranged around the outer side wall of the mandrel mold to form an initial structure.

[0055] It should be noted that the cross section of the mandrel mold is set to be a regular polygon.

[0056] Among them, S1-1 specifically includes: A tube sleeve made of polytetrafluoroethylene material is sleeved on a core shaft mold to form a first structure, and a support tube 200 is sleeved on an outer wall of the first structure to form an initial structure.

[0057] Alternatively, a polytetrafluoroethylene coating is applied to the outer wall of the mandrel mold to form the second structure, and a support tube 200 is sleeved on the outer wall of the second structure to form the initial structure. It should be noted that in this example, the provision of the polytetrafluoroethylene coating facilitates the removal of the mandrel mold after cooling.

[0058] Figure 7 It is a schematic structural diagram of a support tube 200 provided in one embodiment of the present application.

[0059] It should be noted that, refer to Figure 6 The outer wall of the support tube 200 is evenly provided with a plurality of grooves 210 , and the plurality of grooves 210 are arranged along the extension direction of the support tube 200 .

[0060] It should be further explained that the support tube 200 is made of the same resin material as the outer layer 130 , and the support tube 200 forms the inner cavity 111 after being heated and molded, and the support tube 200 is not removed.

[0061] S1-2: Place the wire drawing tube in the groove of the support tube 200.

[0062] Wherein, a wire drawing cavity is formed in the wire drawing tube, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

[0063] S1-3: Weaving metal braided wires on the outer side wall of the initial structure to form an intermediate structure.

[0064] That is, after placing the wire drawing tube in the groove, the metal braided wire is woven to form an intermediate structure.

[0065] For example, the metal braiding wire may be made of stainless steel or nickel-titanium alloy.

[0066] S1-4: A resin tube is sleeved on the outer wall of the middle structure to form a processing structure.

[0067] S1-5: After the processed structure is heated and formed and cooled, the core shaft mold is taken out, and the pulling wire is inserted and fixed along the pulling wire cavity to form the catheter body 100 of the bending-adjusting catheter.

[0068] Figure 8 The method steps of a method for manufacturing an adjustable curved conduit provided in an embodiment of the present application are as follows: Figure 2 .

[0069] Example 2: Reference Figure 8 , the preparation method comprises the following steps: S2-1: An inner layer 110 is arranged around the outer side wall of the mandrel mold to form an initial structure.

[0070] It should be noted that the cross section of the mandrel mold is set to be a regular polygon.

[0071] Among them, S2-1 specifically includes: For example, a tube sleeve made of polytetrafluoroethylene material is placed on a mandrel mold to form an initial structure; S2-2: Place the wire drawing tubes on different faces of the regular polygon.

[0072] It should be noted that the wire drawing tube forms a wire drawing cavity, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

[0073] S2-3: Weaving metal braided wires on the outer side wall of the initial structure to form an intermediate structure.

[0074] That is, after the draw tube is placed, the metal braided wire is woven to form an intermediate structure.

[0075] In a specific implementation, during the weaving process, the metal braiding can constrain the pull wire to the position of the perpendicular midline of the regular polygon side under the restraining force of the braiding wire.

[0076] S2-4: A resin tube is sleeved on the outer wall of the middle structure to form a processing structure.

[0077] S2-5: After the processed structure is heated and formed and cooled, the core shaft mold is taken out, and the pull wire is inserted and fixed along the pull wire cavity to form the catheter body 100 of the bending adjustment catheter.

[0078] On the second aspect, the embodiment of the present application provides a method for making an adjustable bend catheter. In the embodiment of the present application, since the inner cavity 111 is set to a regular polygon shape, and further, the core shaft mold is also set to a regular polygon shape, when setting the wire pulling cavity 112, since the edges of the regular polygon shape are straight lines, unlike the circle, it is not easy to deviate or roll during the fixing process of the wire pulling cavity 112. Therefore, the wire pulling wire can be better fixed to avoid the wire pulling wire from tilting along the head and tail of the core shaft mold, and then the catheter bending will be twisted greatly, reducing the bending accuracy. Furthermore, since the method for making an adjustable bend catheter is a method for making an adjustable bend catheter disclosed in all the technical solutions of the first aspect of the present application, the method for making an adjustable bend catheter has the technical effects of all the technical solutions of the first aspect of the present application, which will not be repeated here.

[0079] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0080] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. An adjustable curved conduit, characterized in that: include: a catheter body; The catheter body is formed with an inner cavity, and the inner cavity is arranged along the extension direction of the catheter body; The cross-sectional shape of the inner cavity is set to be a regular polygon, a wire pull cavity is set along the side of the regular polygon, and the wire pull cavity is set along the extension direction of the catheter body; wherein, the radius of the circumscribed circle of the regular polygon is greater than the minimum distance from the center of the inner cavity to the outer diameter of the wire pull cavity, and is less than or equal to the maximum distance from the center of the inner cavity to the outer diameter of the wire pull cavity.

2. The adjustable curved conduit according to claim 1, characterized in that: The regular polygon is set to be one of a regular quadrilateral, a regular pentagon or a regular hexagon.

3. The adjustable curved conduit according to claim 1, characterized in that: The center of the wire pulling cavity is arranged along the perpendicular midline of the regular polygon side.

4. The adjustable curved conduit according to any one of claims 1 to 3, characterized in that: The catheter body includes an inner layer, a middle layer and an outer layer from inside to outside; The inner cavity is formed in the middle of the inner layer, and the wire drawing cavity is arranged around the inner layer; The inner layer is configured to be one of polytetrafluoroethylene material or resin material, the middle layer is configured to be metal material, and the outer layer is configured to be resin material.

5. A method for manufacturing an adjustable curved conduit, characterized in that: The manufacturing method is used to manufacture an adjustable curved conduit according to any one of claims 1 to 4; the manufacturing method comprises the following steps: An inner layer is arranged around the outer side wall of the mandrel mold to form an initial structure; wherein the cross section of the mandrel mold is arranged to be a regular polygon; Weaving metal braided wires on the outer side wall of the initial structure to form an intermediate structure; A resin tube is sleeved on the outer wall of the intermediate structure to form a processing structure; The processing structure is heated and formed, and after cooling, the core shaft mold is taken out to form the catheter body of the adjustable bending catheter.

6. The method for manufacturing an adjustable curved conduit according to claim 5, characterized in that: Arranging the inner layer around the outer wall of the mandrel mold to form an initial structure specifically includes the following steps: A tube sleeve made of polytetrafluoroethylene is sleeved on a mandrel mold to form a first structure, and a support tube is sleeved on an outer wall of the first structure to form the initial structure; Alternatively, a polytetrafluoroethylene coating is coated on the outer side wall of the mandrel mold to form a second structure, and the support tube is sleeved on the outer side wall of the second structure to form the initial structure; Wherein, the outer side wall of the support tube is provided with a groove, and the groove is arranged along the extension direction of the core shaft mold.

7. The method for manufacturing an adjustable curved conduit according to claim 5, characterized in that: Arranging the inner layer around the outer wall of the mandrel mold to form an initial structure specifically includes the following steps: The initial structure is formed by sleeves made of polytetrafluoroethylene material on the mandrel mold.

8. The method for manufacturing an adjustable curved conduit according to claim 6, characterized in that: After the step of arranging the inner layer around the outer side wall of the mandrel mold to form the initial structure, the following steps are also included: A wire drawing tube is placed in the groove of the support tube; wherein a wire drawing cavity is formed in the wire drawing tube, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

9. The method for manufacturing an adjustable curved conduit according to claim 7, characterized in that: Before the step of weaving the metal braided wires on the outer side wall of the initial structure to form an intermediate structure, the step further includes: The wire drawing tubes are respectively arranged on different faces of the regular polygon; wherein the wire drawing tubes form a wire drawing cavity, and the wire drawing cavity is arranged along the extension direction of the core shaft mold.

10. A method for manufacturing an adjustable curved conduit according to claim 8 or 9, characterized in that: The method of heating and molding the processing structure and removing the mandrel mold after cooling to form the catheter body of the adjustable bend catheter specifically includes: The processing structure is heated and formed, and after cooling, the core shaft mold is taken out, and the draw wire is inserted along the draw wire cavity and fixed to form the catheter body of the adjustable bend catheter.

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