Bending-adjustable stay wire structure of bending-adjustable pipe

Abstract

The bending-adjustable stay wire structure of the bending-adjustable pipe comprises a composite catheter and a bending-adjustable stay wire, the bending-adjustable stay wire comprises a rigid section, a spiral spring section and a flexible section which are fixedly connected in sequence, and the composite catheter comprises a hard supporting section and a flexible bending section located at the head of the hard supporting section; the composite catheter is provided with a wire drawing cavity in the length direction, the rigid section penetrates through the wire drawing cavity and comprises a power input end and a power output end, the power input end is connected with the spiral spring section, and the power output end is fixedly connected to the end, away from the hard supporting section, of the flexible bending section. The end, away from the spiral spring section, of the flexible section is connected to the operating handle. The bending device has the advantages that fine bending control of the composite guide pipe is facilitated, the flexible bending section can be straightened quickly in the using process, operation is convenient and fast, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of medical catheter bending control, and in particular to a bending-adjustable pull-wire structure of a bending-adjustable tube. Background Art

[0002] At present, the existing medical catheters on the market are mainly composed of a polymer inner tube, an intermediate braided tube, and a polymer outer tube. A pull wire is connected between the handle and the pull ring at the head end of the medical catheter. The handle is operated and the medical catheter head end is controlled by mechanical force to achieve bending. After the pull wire is released, the elastic reset force of the medical catheter head end itself is used to naturally rebound and restore to the original straight shape. However, there is a defect in the process of resetting the head end of the medical catheter, that is, it is difficult to completely and quickly reset the medical catheter to the original straight state in a short time relying on the elastic reset characteristics of the medical catheter material itself. After repeated use, the medical catheter itself is prone to mechanical fatigue, resulting in the medical catheter head end being unable to achieve elastic deformation reset. In addition, the material of the bending adjustment pull wire on the existing market is usually steel wire, so that the flexibility of the use of the medical catheter is completely determined by the operator's own operating experience. It is difficult for novices to operate, and even experienced operators find it difficult to perform high-precision bending control on the head of the medical catheter. The above defects need to be improved urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a bending pipe adjustable bending wire structure, which is beneficial to the refined bending control of the composite catheter, the flexible bending section can be quickly straightened during use, the operation is convenient, and the service life is extended.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A bending pipe adjustable bending wire structure, comprising a composite pipe and a bending wire, the bending wire comprising a rigid section, a spiral spring section and a flexible section fixedly connected in sequence, the composite pipe comprising a hard support section and a flexible bending section located at the head of the hard support section; The composite catheter is provided with a wire pulling cavity along the length direction, the rigid section is inserted into the wire pulling cavity, the rigid section includes a power input end and a power output end, the power input end is connected to the coil spring section, the power output end is fixedly connected to one end of the flexible bending section away from the hard support section, and the end of the flexible section away from the coil spring section is connected to an operating handle.

[0005] By adopting the above technical scheme, when the operator pulls the flexible section of the bending wire through the operating handle, the flexible section drives the coil spring section to undergo tensile deformation and store elastic potential energy, and at the same time, the coil spring section acts on the power input end of the rigid section, thereby driving the power output end to pull the flexible bending section of the composite catheter to bend relative to the rigid support section, thereby realizing the bending control of the head of the composite catheter. During the bending process, due to the tensile deformation of the coil spring section, the displacement stroke of the flexible section pulled by the operating handle is greater than the displacement stroke of the power output end, thereby making the bending control of the flexible bending section more precise, which is beneficial to the refined bending control of the composite catheter. When the operator releases the pulling force on the flexible section through the operating handle, the coil spring section immediately releases its accumulated elastic potential energy, and cooperates with the elastic reset force of the flexible bending section to drive the rigid section to bend the composite catheter. The flexible bending section is quickly reset and straightened toward the straight state. At the same time, since the spiral spring section has a certain elastic deformation ability, the elastic potential energy accumulated inside it can be gradually released, avoiding the damage to the internal structure of the composite catheter caused by the huge impact force generated in an instant, thereby realizing the gradual reset and straightening of the composite catheter. After repeated use, even if the flexible bending section appears elastic fatigue, the flexible bending section can be quickly straightened by relying on the elastic force of the spiral spring section. In addition, the spring structure of the spiral spring section makes the stress evenly distributed among multiple turns of the spiral spring section, reducing the possibility of local stress concentration, thereby improving the durability and reliability of the entire composite catheter, which is beneficial to the refined bending control of the composite catheter, and the flexible bending section can be quickly straightened during use, the operation is convenient, and the service life is extended.

[0006] The present invention is further configured as follows: the spiral spring segment is made of stainless steel or titanium alloy.

[0007] By adopting the above technical solution, the spiral spring segment made of stainless steel or titanium alloy has the characteristics of high strength and corrosion resistance, and also has good elastic recovery performance, which can ensure that the spiral spring segment has sufficient elasticity and durability.

[0008] The present invention is further configured as follows: both ends of the coil spring segment are fixedly connected to the rigid segment and the flexible segment at the corresponding ends by laser welding.

[0009] By adopting the above technical solution, the laser welding method can improve the welding accuracy of the corresponding welding point positions between the two ends of the spiral spring segment and the rigid segment and the flexible segment, thereby ensuring that the spiral spring segment can meet the predetermined energy storage and release performance.

[0010] The present invention is further configured as follows: the coil spring segment is formed by spirally winding a metal wire using a precision winding machine, and the wound coil spring segment is subjected to quenching and tempering treatment.

[0011] By adopting the above technical solution, the coil spring segment adopts quenching and tempering heat treatment, the purpose of which is to further improve the elastic modulus and fatigue resistance of the coil spring segment, ensuring that it can maintain a good working condition during long-term repeated bending and resetting.

[0012] The present invention is further configured as follows: the operating handle is provided with a winding roller, and one end of the compliant section away from the spiral spring section is wound around the winding roller.

[0013] By adopting the above technical solution, the operator can control the forward or reverse rotation of the winding roller through the operating handle, thereby driving the winding or unwinding of the flexible section.

[0014] The present invention is further configured as follows: the composite catheter comprises an inner tube, an intermediate braided tube and an outer tube, the inner tube is made of polytetrafluoroethylene material, and the outer tube is made of biologically inert polymer material.

[0015] By adopting the above technical solution, the inner tube made of polytetrafluoroethylene material can provide good lubrication, ensuring that the inner part of the inner tube has the characteristic of low friction coefficient.

[0016] The present invention is further configured as follows: the outer layer tube includes a hard segment outer layer and a soft segment outer layer fixedly connected along the length direction, the outer layer tube is welded and wrapped around the inner layer tube with an intermediate braided layer through a leaching process, and the soft segment outer layer and the intermediate braided tube and inner layer tube wrapped in the corresponding soft segment outer layer area constitute the flexible bending section, and the hard segment outer layer and the intermediate braided tube and inner layer tube wrapped in the corresponding hard segment outer layer area constitute the hard supporting section.

[0017] By adopting the above technical solution, the hard outer layer and the soft outer layer of the outer tube can be formed in sections outside the inner tube wrapped with the intermediate braided tube, and because there is a hardness difference between the hard outer layer and the soft outer layer, the flexible bending section can bend relative to the hard supporting section.

[0018] The present invention is further configured as follows: the wire pulling cavity is fixedly connected to a pull ring at one end away from the hard supporting section, and the power output end is fixedly connected to the pull ring.

[0019] By adopting the above technical solution, the bending wire can pull the pull ring, and then pull the flexible bending section through the pull ring to bend and deform relative to the hard supporting section.

[0020] The present invention is further configured as follows: the power output end is fixedly connected to the pull ring by laser welding.

[0021] By adopting the above technical solution, the fixing method of laser welding is beneficial to improving the connection firmness between the power output end of the rigid section and the pull ring.

[0022] The present invention is further configured as follows: the pull ring is welded and fixed between the inner layer tube and the outer layer tube.

[0023] By adopting the above technical solution, during assembly, the pull ring is firstly put on the outside of the inner tube wrapped with the intermediate braided tube, and then the outer tube is welded to the outside of the inner tube and the intermediate braided tube, so that the pull ring is welded and locked between the inner tube and the outer tube. This welding and fixing method can greatly improve the installation firmness of the pull ring.

[0024] In summary, the present invention has the following beneficial effects: A wire pulling cavity is opened in the composite conduit, and the rigid section of the bending wire is passed through the wire pulling cavity, so that the power output end of the rigid section is welded to the pull ring at the bottom of the wire pulling cavity. When the operator pulls the flexible section of the bending wire through the operating handle, the flexible section drives the spiral spring section to undergo tensile deformation and store elastic potential energy. At the same time, the spiral spring section acts on the power input end of the rigid section, thereby driving the power output end to pull the flexible bending section of the composite conduit to bend relative to the rigid supporting section, thereby realizing the bending control of the composite conduit head. During the bending process, due to the tensile deformation of the spiral spring section, the displacement stroke of the flexible section pulled by the operating handle is greater than the displacement stroke of the power output end, thereby making the bending control of the flexible bending section more precise, which is beneficial to the refined bending control of the composite conduit. When the operator releases the pulling force on the flexible section through the operating handle, the spiral spring section immediately releases its accumulated elastic potential energy, and cooperates with the flexible bending The elastic restoring force of the curved section itself drives the rigid section to quickly restore and straighten the flexible curved section of the composite catheter toward a straight state. At the same time, since the spiral spring section has a certain elastic deformation ability, the elastic potential energy accumulated inside it can be gradually released, avoiding the damage to the internal structure of the composite catheter caused by the huge impact force generated in an instant, thereby realizing the progressive restoration and straightening of the composite catheter. After repeated use, even if the flexible curved section appears elastic fatigue, the flexible curved section can be quickly straightened by relying on the elastic force of the spiral spring section. In addition, the spring structure of the spiral spring section makes the stress evenly distributed among multiple turns of the spiral spring section, reducing the possibility of local stress concentration, thereby improving the durability and reliability of the entire composite catheter, which is beneficial to the refined bending control of the composite catheter, the flexible curved section can be quickly straightened during use, the operation is convenient, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection between the bending adjustment wire of the present invention through the pull ring and the inner layer tube.

[0026] Figure 2 It is a schematic diagram of an inner layer tube of the present invention being wrapped with a middle braided tube.

[0027] Figure 3It is a schematic diagram of the connection between the composite conduit and the bending adjustment wire of the present invention.

[0028] Figure 4 It is a longitudinal cross-sectional view of the composite catheter of the present invention.

[0029] In the figure: 1. composite catheter; 10. wire pulling cavity; 11. inner tube; 12. middle braided tube; 13. outer tube; 131. hard segment outer layer; 132. soft segment outer layer; 14. hard support segment; 15. flexible bending segment; 2. bending adjustment wire; 21. rigid segment; 211. power input end; 212. power output end; 22. spiral spring segment; 23. flexible segment; 3. operating handle; 31. winding roller; 4. pull ring. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] A bending pipe adjustable bending wire structure, such as Figure 1-4 As shown, it includes a composite catheter 1 and a bending wire 2, the bending wire 2 includes a rigid section 21, a spiral spring section 22 and a flexible section 23 fixedly connected in sequence, the composite catheter 1 includes a hard support section 14, and a flexible bending section 15 located at the head of the hard support section 14; the composite catheter 1 is provided with a wire pulling cavity 10 along the length direction, the rigid section 21 is inserted into the wire pulling cavity 10, the rigid section 21 includes a power input end 211 and a power output end 212, the power input end 211 is connected to the spiral spring section 22, the power output end 212 is fixedly connected to the end of the flexible bending section 15 away from the hard support section 14, and the end of the flexible section 23 away from the spiral spring section 22 is connected to the operating handle 3; the composite catheter 1 includes an inner tube 11, an intermediate braided tube 12 and an outer tube 13, the inner tube 11 is made of polytetrafluoroethylene material, the outer tube 13 is made of bio-inert polymer material, and the inner tube 11 is made of polytetrafluoroethylene material. The tube 11 can provide good lubrication to ensure that the inner tube 11 has a low friction coefficient; the outer tube 13 includes a hard segment outer layer 131 and a soft segment outer layer 132 fixedly connected along the length direction, and the outer tube 13 is welded and wrapped around the inner tube 11 with an intermediate braided layer through a leaching process, and the soft segment outer layer 132 and the intermediate braided tube 12 and the inner tube 11 wrapped in the corresponding soft segment outer layer 132 area constitute a flexible bending section 15, and the hard segment outer layer 131 and the intermediate braided tube 12 and the inner tube 11 wrapped in the corresponding hard segment outer layer 131 area constitute a hard support section 14, so that the hard segment outer layer 131 and the soft segment outer layer 132 of the outer tube 13 can be segmentedly formed outside the inner tube 11 wrapped with the intermediate braided tube 12, and because there is a hardness difference between the hard segment outer layer 131 and the soft segment outer layer 132, the flexible bending section 15 can bend relative to the hard support section 14.

[0032] like Figure 1-3As shown, the wire drawing cavity 10 is fixedly connected with a pull ring 4 at one end away from the rigid support section 14, and the power output end 212 is fixedly connected to the pull ring 4. The bending wire 2 can pull the pull ring 4, and then pull the flexible bending section 15 to bend and deform relative to the rigid support section 14 through the pull ring 4; the power output end 212 is fixedly connected to the pull ring 4 by laser welding, and the laser welding fixing method is conducive to improving the connection firmness between the power output end 212 of the rigid section 21 and the pull ring 4; the pull ring 4 is welded and fixed between the inner tube 11 and the outer tube 13, and during assembly processing , firstly, the pull ring 4 is sleeved on the inner tube 11 wrapped with the middle braided tube 12, and then the outer tube 13 is welded to the inner tube 11 and the middle braided tube 12, so that the pull ring 4 is welded and locked between the inner tube 11 and the outer tube 13. This welding and fixing method can greatly improve the installation firmness of the pull ring 4; in addition, the spiral spring segment 22 in this embodiment is made of stainless steel or titanium alloy. The spiral spring segment 22 made of stainless steel or titanium alloy has the characteristics of high strength and corrosion resistance. At the same time, it also has good elastic recovery performance, which can ensure the spiral spring The spring section 22 has sufficient elasticity and durability; in this embodiment, the rigid section 21 can be made of stainless steel, and the flexible section 23 can be in the form of a drawstring; the two ends of the spiral spring section 22 are fixedly connected to the rigid section 21 and the flexible section 23 at their corresponding ends by laser welding, and the laser welding method can improve the welding accuracy of the corresponding welding point positions of the two ends of the spiral spring section 22 and the rigid section 21 and the flexible section 23, thereby ensuring that the spiral spring section 22 can meet the predetermined energy storage and release performance; the spiral spring section 22 is wound by a precision winding machine to spirally wind the metal wire. The coil spring segment 22 is formed, and the wound coil spring segment 22 is quenched and tempered. The coil spring segment 22 adopts quenching and tempering heat treatment, the purpose of which is to further improve the elastic modulus and fatigue resistance of the coil spring segment 22, and ensure that it can maintain a good working condition during long-term repeated bending and resetting; the operating handle 3 is provided with a winding roller 31, and the end of the flexible segment 23 away from the coil spring segment 22 is wound on the winding roller 31. The operator can control the forward or reverse rotation of the winding roller 31 through the operating handle 3, thereby driving the winding or unwinding of the flexible segment 23.

[0033] The basic working principle of the present invention is as follows: a wire drawing cavity 10 is provided in the composite conduit 1, the rigid section 21 of the bending adjustment wire 2 is passed through the wire drawing cavity 10, and the power output end 212 of the rigid section 21 is welded to the pull ring 4 at the bottom of the wire drawing cavity 10. When the operator pulls the flexible section 23 of the bending adjustment wire 2 through the operating handle 3, the flexible section 23 drives the spiral spring section 22 to undergo tensile deformation and store elastic potential energy. At the same time, the spiral spring section 22 acts on the power input end 211 of the rigid section 21, thereby driving the power output end 212 to move. 212 pulls the flexible bending section 15 of the composite conduit 1 to bend relative to the hard support section 14, thereby realizing the bending control of the head of the composite conduit 1. During the bending process, due to the tensile deformation of the spiral spring section 22, the displacement stroke of the flexible section 23 pulled by the operating handle 3 is greater than the displacement stroke of the power output end 212, thereby making the bending control of the flexible bending section 15 more precise, which is conducive to the refined bending control of the composite conduit 1. When the operator releases the pulling force on the flexible section 23 through the operating handle 3, the spiral spring section 2 2 immediately releases its own accumulated elastic potential energy, cooperates with the elastic restoring force of the flexible bending section 15 itself, drives the rigid section 21 to quickly reset and straighten the flexible bending section 15 of the composite conduit 1 in the direction of the straight state, and at the same time, because the spiral spring section 22 has a certain elastic deformation ability, the elastic potential energy accumulated inside it can be gradually released, avoiding the damage to the internal structure of the composite conduit 1 caused by the huge impact force generated in an instant, thereby realizing the progressive reset and straightening of the composite conduit 1. After repeated use, even if the flexible bending section 15 is elastically fatigued, the flexible bending section 15 can be quickly straightened by relying on the elastic force of the spiral spring section 22. In addition, the spring structure of the spiral spring section 22 makes the stress evenly distributed among the multiple turns of the spiral spring section 22, reducing the possibility of local stress concentration, thereby improving the durability and reliability of the entire composite conduit 1, which is beneficial to the refined bending control of the composite conduit 1, and the flexible bending section 15 can be quickly straightened during use, convenient operation, and extended service life.

[0034] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A bending pipe adjustable bending wire structure, characterized in that: The invention comprises a composite catheter (1) and a bending adjustment wire (2), wherein the bending adjustment wire (2) comprises a rigid section (21), a spiral spring section (22) and a flexible section (23) which are fixedly connected in sequence, and the composite catheter (1) comprises a rigid support section (14) and a flexible bending section (15) located at the head of the rigid support section (14); The composite catheter (1) is provided with a wire pulling cavity (10) along the length direction, the rigid section (21) is inserted into the wire pulling cavity (10), the rigid section (21) comprises a power input end (211) and a power output end (212), the power input end (211) is connected to the coil spring section (22), the power output end (212) is fixedly connected to one end of the flexible bending section (15) away from the hard supporting section (14), and one end of the compliant section (23) away from the coil spring section (22) is connected to an operating handle (3).

2. The adjustable bending wire structure of the bending pipe according to claim 1, characterized in that: The helical spring segment (22) is made of stainless steel or titanium alloy.

3. The adjustable bending wire structure of the bending pipe according to claim 1, characterized in that: The two ends of the coil spring segment (22) are fixedly connected to the rigid segment (21) and the flexible segment (23) at the corresponding ends by laser welding.

4. The adjustable bending wire structure of the bending pipe according to claim 1, characterized in that: The helical spring segment (22) is formed by spirally winding a metal wire using a precision winding machine, and the wound helical spring segment (22) is subjected to quenching and tempering treatments.

5. The adjustable bending wire structure of the bending pipe according to claim 1, characterized in that: The operating handle (3) is provided with a winding roller (31), and one end of the compliant section (23) away from the spiral spring section (22) is wound around the winding roller (31).

6. The adjustable bending wire structure of the bending pipe according to claim 1, characterized in that: The composite catheter (1) comprises an inner tube (11), an intermediate braided tube (12) and an outer tube (13); the inner tube (11) is made of polytetrafluoroethylene material, and the outer tube (13) is made of a biologically inert polymer material.

7. The adjustable bending wire structure of the bending pipe according to claim 6, characterized in that: The outer layer tube (13) comprises a hard segment outer layer (131) and a soft segment outer layer (132) fixedly connected along the length direction; the outer layer tube (13) is welded and wrapped around the inner layer tube (11) provided with an intermediate braided layer through a leaching process; the soft segment outer layer (132) and the intermediate braided tube (12) and the inner layer tube (11) wrapped in the area corresponding to the soft segment outer layer (132) constitute the flexible bending section (15); the hard segment outer layer (131) and the intermediate braided tube (12) and the inner layer tube (11) wrapped in the area corresponding to the hard segment outer layer (131) constitute the hard support section (14).

8. The adjustable bending wire structure of the bending pipe according to claim 6, characterized in that: The wire pulling cavity (10) is fixedly connected to a pull ring (4) at one end away from the hard supporting section (14), and the power output end (212) is fixedly connected to the pull ring (4).

9. The adjustable bending wire structure of the bending pipe according to claim 8, characterized in that: The power output end (212) is fixedly connected to the pull ring (4) by laser welding.

10. The adjustable bending wire pulling structure of the bending pipe according to claim 8, characterized in that: The pull ring (4) is welded and fixed between the inner layer tube (11) and the outer layer tube (13).

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