Endoscopic catheter and endoscope

Abstract

The utility model discloses an endoscopic catheter and an endoscope, wherein the endoscopic catheter comprises a rigid section, a gradient section and a flexible section connected in sequence, wherein the rigid section is used to connect to the control box of the endoscope; the flexible section is used to connect to the bending adjustment structure of the endoscope; the hardness of the rigid section, the gradient section and the flexible section gradually decreases. The rigid section of the endoscopic catheter has excellent support and pushing properties, and the gradient section provides a smooth rigid-flexible conversion along the axial direction, so that the hardness gradient transition of the endoscopic catheter is smooth. The flexible section has good compliance. At the same time, the overall anti-bending performance and lumen retention performance of the endoscopic catheter are good, avoiding the performance defects of the parts between the segments caused by the multi-segment structure. This multi-level hardness endoscopic catheter can better meet the needs of pushing to the lesion location during endoscopic examination, and improve the accuracy and convenience of operation.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an endoscope catheter and an endoscope. Background Art

[0002] Endoscopes are commonly used medical devices in clinical practice. Medical personnel can use endoscopes to observe local lesions, obtain tissue samples, stop bleeding, resect, drain, repair or reconstruct channels through natural cavities or artificial channels of the human body under direct vision or with the support of auxiliary equipment. It has a wide range of application scenarios. During endoscopic operation, it is often necessary to push the catheter from outside the body to the lesion site, which requires the catheter to have strong pushing performance, anti-bending performance and soft performance.

[0003] However, the multi-segment catheters currently used in endoscopic equipment have large differences in the performance of the connecting parts between the segments, which makes their overall anti-bending performance and shape retention ability poor. The proximal end of this structure can provide limited support and pushing performance.

[0004] Therefore, the prior art still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present utility model is to provide an endoscopic catheter and an endoscope, aiming to solve the problem that the structural variation design of the multi-segment endoscopic catheter will lead to large differences in the performance of the connecting parts between the segments, thereby making its overall anti-bending performance and shape retention ability poor, and the support and pushing performance that the proximal end can provide are limited.

[0006] The technical solution of the utility model is as follows:

[0007] An endoscope catheter comprises a rigid section, a gradient section and a flexible section connected in sequence, wherein the rigid section is used to connect to a control box of an endoscope; the flexible section is used to connect to a bending adjustment structure of the endoscope; the hardness of the rigid section, the gradient section and the flexible section gradually decreases.

[0008] The endoscopic catheter, wherein the gradient section includes a first inner lining layer, a first outer covering layer and a first woven layer arranged between the first inner lining layer and the first outer covering layer, and the mesh count of the first woven layer gradually decreases from one end close to the rigid section to one end away from the rigid section.

[0009] The endoscopic catheter, wherein the flexible section includes a second inner lining layer, a second outer covering layer and a second braided layer arranged between the second inner lining layer and the second outer covering layer, and the mesh number of the first braided layer at the position where the gradient section contacts the flexible section is equal to the mesh number of the second braided layer.

[0010] The endoscopic catheter, wherein the first lining layer and the second lining layer are any one of a block polyetheramide resin layer, a high-density polyethylene layer, and a polytetrafluoroethylene layer; and / or the first outer jacket layer and the second outer jacket layer are both thermoplastic polyurethane elastomer rubber layers.

[0011] The endoscopic catheter, wherein the first braided layer is a nickel-titanium wire braided layer or a stainless steel wire braided layer; and / or the second braided layer is a nickel-titanium wire braided layer or a stainless steel wire braided layer.

[0012] In the endoscope catheter, the rigid section includes a main tube body and a reinforcement tube body, and the reinforcement tube body is arranged on the inner wall surface of the main tube body, or on the outer wall surface of the main tube body.

[0013] The endoscopic catheter, wherein the main body includes a third lining layer, a third braided layer and a third outer jacket layer stacked in sequence, and the third lining layer, the third braided layer and the third outer jacket layer are each integrally connected to the first lining layer, the first braided layer and the first outer jacket layer.

[0014] The endoscopic catheter, wherein the gradient section comprises a first bottom tube and a first sleeve tube which are stacked, the first sleeve tube comprises at least three hot-melt tubes which are sequentially arranged along the axial direction, and the hardness of the multiple hot-melt tubes gradually decreases in the direction toward the flexible section.

[0015] The endoscopic catheter, wherein the flexible section comprises a second bottom tube and a second sleeve arranged in a stacked manner, and the hardness of the first sleeve at a position where the gradient section contacts the flexible section is equal to the hardness of the second sleeve; and / or the rigid section comprises a third bottom tube and a third sleeve arranged in a stacked manner, and the hardness of the third sleeve at a position where the gradient section contacts the rigid section is equal to the hardness of the third sleeve.

[0016] The present application also discloses an endoscope, wherein the endoscope comprises a control box, a propulsion member and an endoscope catheter as described above, the propulsion member is provided with an axially penetrating central channel, and the end of the rigid section passes through the central channel and is connected to the control box.

[0017] Compared with the prior art, the embodiment of the utility model has the following advantages:

[0018] The endoscope catheter disclosed in the present application includes a rigid section, a gradient section and a flexible section, wherein the rigid section, the gradient section and the flexible section have gradually decreasing hardness, and the rigid section provides sufficient support to ensure the overall anti-bending performance of the catheter. The gradient section can gradually adapt to the curvature change of the channel, and the flexible section can maintain a certain degree of compliance, so that the endoscope catheter has strong pushing performance, anti-bending performance and compliance when pushed to the lesion position.

[0019] The rigid section of the endoscope catheter has excellent support and pushing properties, and the gradient section provides a smooth rigid-flexible conversion along the axial direction, making the hardness of the endoscope catheter gradually change. The flexible section has good compliance. At the same time, the overall bending resistance and lumen retention performance of the endoscope catheter are good, avoiding the performance defects between the segments caused by the multi-segment structure. This multi-level hardness endoscope catheter can better meet the needs of pushing to the lesion location during endoscopic examination, and improve the accuracy and convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the endoscope in the utility model;

[0022] Figure 2 It is an assembly diagram of the endoscope catheter in the utility model;

[0023] Figure 3 for Figure 2 The cross-sectional view along the AA` direction;

[0024] Figure 4 for Figure 2 The cross-sectional view along the BB` direction;

[0025] Figure 5 for Figure 2 Cross-sectional view along CC` direction;

[0026] Figure 6 This is a schematic diagram of the structure of the first braided layer and the second braided layer in the utility model;

[0027] Figure 7 It is a schematic structural diagram of the first outer covering layer and the second outer covering layer in the utility model.

[0028] Among them, 10, endoscopic catheter; 11, rigid section; 111, main body; 1111, third inner lining layer; 1112, third braided layer; 1113, third outer layer; 112, reinforced tube body; 12, gradient section; 121, first inner lining layer; 122, first braided layer; 123, first outer layer; 124, first sleeve; 13, flexible section; 131, second inner lining layer; 132, second braided layer; 133, second outer layer; 134, second sleeve; 14, bending adjustment structure; 20, control box; 21, first entrance; 22, second entrance; 30, propulsion member; 31, center channel. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1 and Figure 2 In one embodiment of the utility model application, an endoscope catheter 10 is disclosed, which includes a rigid section 11, a gradient section 12 and a flexible section 13 connected in sequence, wherein the rigid section 11 is used to connect with a control box 20 of an endoscope; the flexible section 13 is used to connect with a bending adjustment structure 14 of the endoscope; the hardness of the rigid section 11, the gradient section 12 and the flexible section 13 gradually decreases.

[0031] The embodiment discloses an endoscopic catheter 10, which includes a rigid section 11, a gradient section 12 and a flexible section 13, wherein the hardness of the rigid section 11, the gradient section 12 and the flexible section 13 gradually decreases. This allows the endoscopic catheter 10 to have strong pushing performance, anti-bending performance and flexibility when pushed to the lesion site. The rigid section 11 provides sufficient support to ensure the overall anti-bending performance of the catheter. The gradient section 12 can gradually adapt to the curvature change of the channel, and the flexible section 13 can maintain a certain degree of flexibility.

[0032] The rigid section 11 of the endoscope catheter 10 has excellent support and pushing properties, and the gradient section 12 provides a smooth rigid-flexible conversion along the axial direction, so that the hardness gradient transition of the endoscope catheter 10 is smooth. The flexible section 13 has good compliance. At the same time, the overall anti-bending performance and lumen retention performance of the endoscope catheter 10 are good, avoiding the performance defects between the segments caused by the multi-segment structure. This multi-level hardness endoscope catheter 10 can better meet the needs of pushing to the lesion location during endoscopic examination, and improve the accuracy and convenience of operation.

[0033] Specifically, the flexible section 13 disclosed in this embodiment is used to connect with the bending adjustment structure 14 of the endoscope. The bending adjustment structure 14 provides greater flexibility and adaptability for the insertion end of the endoscope catheter 10, so that the endoscope catheter 10 can better adapt to the changes of the human body cavity during operation. The bending adjustment structure 14 has good bending performance and can be bent and adjusted as needed, so as to better operate the endoscope catheter 10.

[0034] Specifically, the endoscope catheter 10 disclosed in this embodiment is hollow to form an instrument channel that runs from end to end, and components such as component harnesses, biopsy forceps, and traction wires can be arranged in the instrument channel. The endoscope catheter 10 can provide protection for the components arranged in the instrument channel and provide support and sealing for the entire scope body.

[0035] like Figure 2 and Figure 4 As shown, as another implementation of this embodiment, the gradient section 12 includes a first inner lining layer 121, a first outer jacket layer 123 and a first braided layer 122 arranged between the first inner lining layer 121 and the first outer jacket layer 123, and the mesh count of the first braided layer 122 gradually decreases from one end close to the rigid section 11 to the end away from the rigid section 11, so that the deflection of the first braided layer 122 gradually increases in the direction toward the flexible section 13. Due to the reduction in the mesh count, the deflection of the first braided layer 122 in the axial direction increases, and the flexibility gradually increases. This gradual design provides a smooth rigid-flexible conversion of the gradient section 12 of the endoscope catheter 10 in the axial direction, so that the hardness of the gradient section 12 is controllable and adjustable, and the gradual transition is smooth.

[0036] Specifically, the mesh counts at the proximal end and the distal end of the first braided layer 122 disclosed in this embodiment can be further specifically defined according to the hardness requirements of actual on-site use.

[0037] like Figure 2 and Figure 3As shown, as another implementation of this embodiment, the rigid section 11 includes a main body 111, the hardness of the main body 111 is greater than the hardness of the gradient section 12, can meet the use requirements, and can withstand greater force, thereby preventing the endoscope catheter from being deformed or damaged.

[0038] Specifically, in a preferred implementation manner of the present embodiment, the rigid segment 11 also includes a reinforced tube body 112. Through the supporting effect of the reinforced tube body 112, the rigid segment 11 provides higher rigidity and supporting performance, is suitable for parts that require stronger pushing properties, can better resist external pressure and torsional force, maintain the stability and shape of the endoscopic catheter 10, and enhance its anti-bending properties, thereby improving the accuracy and stability of the operation of the endoscopic catheter 10.

[0039] Specifically, the enhanced tube body 112 disclosed in this embodiment is tubular and can be inserted on the inner wall surface of the main tube body 111, or covered on the outer wall surface of the main tube body 111, which can significantly improve the hardness and rigidity of the main tube body 111 in this section. During the advancement of the endoscope, the friction between the endoscope tube body and the external motion device, as well as the process errors caused by the accumulation and bending of the tube body can be effectively reduced.

[0040] Specifically, the rigid segment 11 disclosed in this embodiment is used to connect with the control box 20 of the endoscope. The rigid segment 11 has good rigidity and achieves better force conduction efficiency. The rigid segment 11 provides additional support, which can ensure a firm connection between the endoscope catheter 10 and the control box 20, reduce loosening or breakage of the connection part, improve the stability and reliability of the entire system, and enable the end of the endoscope catheter 10 to maintain a relatively stable shape and not easily deformed.

[0041] like Figure 3 and Figure 6 As shown, as another implementation of this embodiment, the main body 111 includes a third lining layer 1111, a third braided layer 1112 and a third outer jacket layer 1113 stacked in sequence, and the strength and stability of the overall structure can be increased by connecting multiple layers of materials. The third lining layer 1111, the third braided layer 1112, and the third outer jacket layer 1113 are each integrally connected with the first lining layer 121, the first braided layer 122, and the first outer jacket layer 123. Compared with splicing or other connection methods, the integral connection can more effectively utilize materials, reduce the occurrence of fractures at the connection, and improve manufacturing efficiency and resource utilization.

[0042] like Figure 2 and Figure 5As shown, as another implementation of this embodiment, the flexible segment 13 includes a second lining layer 131, a second outer layer 133 and a second braided layer 132 arranged between the second lining layer 131 and the second outer layer 133, and the mesh number of the first braided layer 122 at the position where the gradient segment 12 contacts the flexible segment 13 is equal to the mesh number of the second braided layer 132. Similarly, the mesh number of the first braided layer 122 at the position where the gradient segment 12 contacts the rigid segment 11 is equal to the mesh number of the third braided layer 1112 (see Figure 3 ) The first braided layer 122 and the second braided layer 132 are better connected, the gaps between the braided meshes are effectively reduced, the bonding strength between the first braided layer 122 and the second braided layer 132 is improved, the transition is smooth, and it is beneficial to the balance of the overall strength change of the endoscope catheter 10.

[0043] Specifically, the third lining layer 1111, the first lining layer 121 and the second lining layer 131 disclosed in this embodiment are integrally formed, and the third lining layer 1111, the first lining layer 121 and the second lining layer 131 serve as internal protective layers of the endoscopic catheter 10, which can withstand internal pressure and external friction and maintain the shape and strength of the endoscopic catheter 10.

[0044] Specifically, the third braided layer 1112, the first braided layer 122 and the second braided layer 132 disclosed in this embodiment are integrally formed, which can better control the structure and characteristics of the braided layer to achieve better performance.

[0045] Specifically, the third outer covering layer 1113, the first outer covering layer 123 and the second outer covering layer 133 disclosed in this embodiment are integrally formed, which increases the bonding strength between the rigid section, the gradient section 12 and the flexible section 13, reduces the risk of separation or falling off between the tube body segments, and thus improves the reliability and service life of the endoscopic catheter 10.

[0046] Specifically, the first braided layer 122 and the second braided layer 132 disclosed in this embodiment are both braided meshes made of braided wires. The braided meshes have high tensile strength and wear resistance, can withstand greater tension and friction during operation, and increase the service life of the endoscope catheter 10.

[0047] Specifically, as another implementation of this embodiment, the first lining layer 121, the second lining layer 131 and the third lining layer 1111 are any one of a block polyetheramide resin layer, a high-density polyethylene layer, and a polytetrafluoroethylene layer, which have excellent resistance in a chemically corrosive environment and can effectively prevent the pipe body from being corroded and damaged.

[0048] Specifically, as another implementation of this embodiment, the first braided layer 122 is a nickel-titanium wire braided layer or a stainless steel wire braided layer; and / or the second braided layer 132 is a nickel-titanium wire braided layer or a stainless steel wire braided layer; and / or the third braided layer 1112 is a nickel-titanium wire braided layer or a stainless steel wire braided layer. Nickel-titanium wire or stainless steel wire has excellent strength and durability, which can increase the tensile strength and durability of the braided layer. This helps to improve the overall strength of the tube body so that it can withstand high pressure and external stress requirements.

[0049] It should be noted that the braided layer is only exemplified in this embodiment, but the protection scope of the present invention is not limited to this. Other types of braided layers can achieve the technical effects disclosed in this application and should also be within the scope of protection of this application as equivalent replacements for the concept of the present invention.

[0050] Specifically, the manufacturing process of the endoscope catheter 10 disclosed in this embodiment includes the following steps:

[0051] Step 1: Add high-hardness polymer material into a catheter extruder, and the catheter extruder extrudes an inner tube on a core shaft, and the inner tube sequentially forms the third inner lining layer 1111, the first inner lining layer 121 and the second inner lining layer 131;

[0052] Step 2: Winding the wire through a braiding machine, weaving the braided mesh on the outer wall surface of the inner tube, the mesh count of the braided mesh gradually decreases from the proximal end to the distal end of the tube body until it is flat, to obtain a double-layer composite braided tube, the double-layer composite braided tube sequentially forms the third braided layer 1112, the first braided layer 122 and the second braided layer 132;

[0053] Step three: adding another polymer material into the catheter extruder, and the catheter extruder extrudes a covering tube on the outer wall of the double-layer composite braided tube, and the covering layers sequentially form the third outer jacket layer 1113, the first outer jacket layer 123 and the second outer jacket layer 133.

[0054] Specifically, the endoscope catheter 10 disclosed in this embodiment can increase the corrosion resistance of the tube body by using polymer materials to make the covering layer, thereby preventing the tube body from being corroded and damaged. The manufacturing process of the endoscope catheter 10 is stable, the wall thickness is uniform, and the processing efficiency is high.

[0055] like Figure 2 and Figure 7As shown, as another implementation of this embodiment, the gradient section 12 includes a first bottom tube and a first sleeve 124 which are stacked, and the first sleeve 124 includes at least three hot melt tubes which are sequentially arranged along the axial direction, and the hardness of the multiple hot melt tubes gradually decreases in the direction toward the flexible section 13, so that the deflection of the first sleeve 124 gradually increases in the direction toward the flexible section 13. The first bottom tube includes a fourth lining layer and a fourth braided layer, and the number of the fourth braided layers of the first bottom tube is the same or different; when the number of the fourth braided layers of the first bottom tube is the same, the first sleeve 124 can be arranged on the outside of the first bottom tube, and due to the different hardness of the multiple hot melt tubes, the deflection of the first sleeve 124 in the axial direction increases, and the flexibility gradually increases. This gradual design provides a smooth rigid-flexible conversion of the gradient section 12 of the endoscope catheter 10 along the axial direction, so that the hardness of the gradient section 12 is controllable and adjustable, and multiple hot melt tubes with different hardness can be arranged for appropriate adjustment.

[0056] Specifically, this embodiment discloses at least three hot-melt tubes with different hardnesses. In actual application, hot-melt tubes with more hardnesses can be used to realize the gradual change function of hardness. The length of hot-melt tubes with different hardnesses can also be adjusted to realize the controllable length of different hardness segments, which can be appropriately adjusted according to the usage scenario.

[0057] Specifically, as another implementation of this embodiment, the rigid section includes a third bottom tube and a third sleeve arranged in a stacked manner, and the flexible section 13 includes a second bottom tube and a second sleeve 134 arranged in a stacked manner, and the hardness of the first sleeve 124 at the position where the gradient section 12 contacts the flexible section 13 is equal to the hardness of the second sleeve 134. The hardness of the first sleeve 124 at the position where the gradient section 12 contacts the rigid section is equal to the hardness of the third sleeve. Ensure that the two ends of the gradient section have the same mechanical properties as the joints, and the connectivity between them is better. The hardness gradient difference will not be too large. If the hardness gradient difference is too large, it will cause stress concentration during bending, resulting in fracture at the joint.

[0058] Specifically, the rigid section disclosed in this embodiment includes a third bottom tube and a third sleeve tube that are stacked. The third bottom tube is integrally formed with the second bottom tube and the first bottom tube. The third sleeve tube is integrally formed with the second sleeve tube and the first sleeve tube. The one-piece manufacturing process can simplify the product manufacturing process, reduce the production process and processing time, and thus improve production efficiency.

[0059] Specifically, the first sleeve 124 disclosed in this embodiment includes at least three hot-melt tubes of different hardness, for example, three hot-melt tubes, and the manufacturing process of the endoscope catheter 10 includes the following steps:

[0060] Step 1: The formed inner tube is separately sleeved on the outside of the core shaft, and then the woven mesh is sleeved on the outside of the inner tube, and tightened, fitted and fixed to form the third bottom tube, the first bottom tube and the second bottom tube in sequence;

[0061] Step 2: Arrange three outer tubes of different hardness in order from large to small according to the hardness gradient to form a covering tube, and then cover it with a layer of heat shrink tube. Use hot melt equipment to gradually heat melt the covering tube from the head end to the tail end. After the overall hot melting is completed, peel off the heat shrink tube, and the covering layer forms the third sleeve, the first sleeve 124 and the second sleeve 134.

[0062] Specifically, by using three outer tubes of different hardness, arranged in a gradient from high to low hardness, the hardness of the first sleeve 124 can be gradually reduced. This design can gradually increase the deflection of the gradient section 12 in the direction toward the flexible section 13, thereby improving the flexibility and pressure resistance of the gradient section 12. The covering layer is formed by gradually hot-melting the covering tube and peeling off the heat shrink tube, so that the adhesion firmness of the covering layer can be achieved. In this way, the close connection between the first sleeve 124 and the second sleeve 134 can be ensured, and the sealing of the main body 111 can be improved.

[0063] Specifically, the manufacturing process of the first sleeve 124 disclosed in this embodiment has controllable and adjustable hardness, which can be appropriately adjusted during sample production, has low dependence on production equipment, and the process is simple and easy to control.

[0064] Specifically, the first sleeve 124 and the second sleeve 134 disclosed in this embodiment are both thermoplastic polyurethane elastomer rubber layers, which have good wear resistance, can resist external physical friction and wear, and extend the service life of the pipe body.

[0065] See also Figure 1 As another embodiment of the present application, an endoscope is disclosed, characterized in that the endoscope comprises a control box 20, a propulsion member 30 and an endoscope catheter 10 as described in any one of the above items, wherein the propulsion member 30 is provided with an axially penetrating central channel 31, and the end of the rigid section 11 passes through the central channel 31 and is connected to the control box 20. Because during the propulsion process of the endoscope catheter 10, due to the flexibility of the endoscope catheter 10, bending and multiple frictions are inevitable during the propulsion process, therefore, the rigid section 11 is fixedly connected to the control box 20, and part of the endoscope catheter 10 is passed through the central channel 31, which can provide support force for the endoscope catheter 10 and assist the axial propulsion of the endoscope catheter 10.

[0066] Specifically, the control box 20 disclosed in this embodiment includes a "Y"-shaped channel, and the "Y"-shaped channel includes a bifurcated first inlet 21, a second inlet 22, and an outlet coaxially arranged with the first inlet 21, and the rigid section 11 is rigidly connected to the outlet and will not produce relative displacement with the control box 20. In actual operation, the instrument channel of the endoscope catheter 10 can be connected through the first inlet 21 and the second inlet 22, and operations of different functions can be realized synchronously.

[0067] Specifically, the first inlet 21 disclosed in this embodiment is a forceps channel inlet, and the second inlet 22 is a negative pressure suction interface, which can realize operations of multiple different functions, such as using forceps to reach into the instrument channel for clamping and operation, and at the same time reaching into the negative pressure tube for negative pressure suction, etc., to improve the efficiency and convenience of operation.

[0068] Specifically, the bending adjustment structure 14 disclosed in this embodiment may be a serpentine connection structure, and a traction disk is provided in the control box 20, and the traction disk is connected to the end of the serpentine connection structure away from the traction disk through a steel wire, and the traction disk can control the bending of the serpentine connection mechanism to realize the overall forward direction of the endoscopic catheter 10.

[0069] Specifically, the propulsion member 30 disclosed in this embodiment includes a telescopic member and an insertion member connected to the telescopic member, and a hollow central channel 31 is formed in the telescopic member and the insertion member. The endoscopic catheter 10 is arranged in the central channel 31. The telescopic member is fence-shaped and can extend or contract in a direction toward or away from the flexible segment 13. The length of the endoscopic catheter 10 inserted in the central channel 31 can be adjusted according to actual needs to reduce unnecessary friction, thereby reducing transmission errors and force loss, and improving insertion efficiency.

[0070] In summary, the present application discloses an endoscopic catheter 10, which includes a rigid section 11, a gradient section 12 and a flexible section 13, wherein the rigid section 11 has a first hardness, the hardness of the gradient section 12 gradually decreases from one end close to the rigid section 11 to the end away from the rigid section 11, and the flexible section 13 has a second hardness, and the first hardness is greater than the second hardness. This allows the endoscopic catheter 10 to have strong pushing performance, anti-bending performance and compliance when pushed to the lesion site. The rigid section 11 provides sufficient support to ensure the overall anti-bending performance of the catheter. The gradient section 12 can gradually adapt to the curvature change of the channel, and the flexible section 13 can maintain a certain degree of compliance.

[0071] The rigid section 11 of the endoscope catheter 10 has excellent support and pushing properties, and the gradient section 12 provides a smooth rigid-flexible conversion along the axial direction, so that the hardness gradient transition of the endoscope catheter 10 is smooth. The flexible section 13 has good compliance. At the same time, the overall anti-bending performance and lumen retention performance of the endoscope catheter 10 are good, avoiding the performance defects between the segments caused by the multi-segment structure. This multi-level hardness endoscope catheter 10 can better meet the needs of pushing to the lesion location during endoscopic examination, and improve the accuracy and convenience of operation.

[0072] Due to the flexible characteristics of the endoscopic catheter 10, bending deformation will occur during the propulsion movement, resulting in force transmission loss and displacement error. The endoscopic catheter 10 set in different working environments can effectively improve the force transmission efficiency of the propulsion device and improve the accuracy and efficiency of endoscope automation control.

[0073] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0074] It should be noted that the present invention takes an endoscope catheter as an example to introduce the specific structure and working principle of the present invention, but the application of the present invention is not limited to the endoscope catheter, and can also be applied to the production and use of other similar workpieces.

[0075] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An endoscopic catheter, characterized in that: It comprises a rigid section, a gradient section and a flexible section connected in sequence, wherein the rigid section is used to be connected to a control box of an endoscope; and the flexible section is used to be connected to a bending adjustment structure of an endoscope; Wherein, the hardness of the rigid section, the gradual section and the flexible section gradually decreases; The gradient section includes a first lining layer, a first outer layer, and a first woven layer arranged between the first lining layer and the first outer layer, and the mesh count of the first woven layer gradually decreases from one end close to the rigid section to one end away from the rigid section.

2. The endoscopic catheter according to claim 1, characterized in that The flexible section includes a second lining layer, a second outer layer and a second woven layer arranged in a stacked manner. The mesh number of the first woven layer at the position where the gradient section contacts the flexible section is equal to the mesh number of the second woven layer.

3. The endoscopic catheter according to claim 2, characterized in that The first inner lining layer and the second inner lining layer are any one of a block polyetheramide resin layer, a high-density polyethylene layer, and a polytetrafluoroethylene layer; and / or, The first outer shell layer and the second outer shell layer are both thermoplastic polyurethane elastomer rubber layers.

4. The endoscopic catheter according to claim 2, characterized in that: The first braided layer is a nickel-titanium wire braided layer or a stainless steel wire braided layer; and / or, The second braided layer is a nickel-titanium wire braided layer or a stainless steel wire braided layer.

5. The endoscopic catheter according to claim 1, characterized in that The rigid section comprises a main pipe body and a reinforcement pipe body, wherein the reinforcement pipe body is arranged on the inner wall surface of the main pipe body or on the outer wall surface of the main pipe body.

6. The endoscopic catheter according to claim 5, characterized in that The main pipe body includes a third lining layer, a third braided layer and a third outer jacket layer which are stacked in sequence, and the third lining layer, the third braided layer and the third outer jacket layer are each integrally connected with the first lining layer, the first braided layer and the first outer jacket layer.

7. The endoscopic catheter according to claim 1, characterized in that: The gradient section includes a first bottom tube and a first sleeve tube which are stacked, the first sleeve tube includes at least three hot-melt tubes which are sequentially arranged along the axial direction, and the hardness of the multiple hot-melt tubes gradually decreases in the direction toward the flexible section.

8. The endoscopic catheter according to claim 7, characterized in that: The flexible section comprises a second bottom tube and a second sleeve tube which are stacked, and the hardness of the first sleeve tube at the position where the gradient section contacts the flexible section is equal to the hardness of the second sleeve tube; and / or, The rigid section includes a third bottom tube and a third sleeve tube which are stacked, and the hardness of the third sleeve tube at a position where the gradient section contacts the rigid section is equal to the hardness of the third sleeve tube.

9. An endoscope, characterized in that: The endoscope comprises a control box, a propulsion member and an endoscopic catheter as claimed in any one of claims 1 to 8, wherein the propulsion member is provided with an axially penetrating central channel, and the end of the rigid section passes through the central channel and is connected to the control box.

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