CN-121490247-B - Adjustable curved pipe

CN121490247BCN 121490247 BCN121490247 BCN 121490247BCN-121490247-B

Abstract

The invention discloses an adjustable bending catheter, which relates to the technical field of interventional medical instruments and comprises an inner tube, an outer tube, a bending adjusting supporting tube and a handle, wherein the inner tube comprises an inner tube bending section at the far end, the inner tube bending section can be bent in a two-way manner, an inner tube bending control section at the far end of the inner tube extends outwards from the outer tube, the outer tube can realize position anchoring through an anchoring structure, the far end of the bending adjusting supporting tube is connected with the inner tube bending control section, the far end of the outer tube is fixed on the bending adjusting supporting tube, the elastic modulus of the bending adjusting supporting tube is smaller than that of the inner tube, and the handle is provided with an inner tube pushing piece. When the outer tube is anchored on the inner wall of a blood vessel, axial acting force is applied to the inner tube through the inner tube pushing piece, the inner tube bending control section bends under the action of the axial acting force and supporting force applied by the bending adjusting supporting tube, the far end of the inner tube can realize large-angle bending adjustment, the inner tube far end can rotate in a three-dimensional space in cooperation with the integral rotation of the inner tube and the outer tube, the bending adjustment of any direction of the bending adjustable catheter is realized, and the bending adjustable catheter better passes through a roundabout blood vessel.

Inventors

YU HUANHUAN
NIU DONGZI
WENG YULIN

Assignees

苏州鼎科医疗技术股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260113

Claims (4)

1. The adjustable bend catheter is characterized by comprising an inner tube (100), an outer tube (200), a bend adjusting support tube (300) and a handle (400), wherein the inner tube (100) passes through the inner cavity of the outer tube (200), and the proximal ends of the inner tube (100) and the outer tube (200) are connected with the handle (400); the inner tube (100) comprises an inner tube bending section (110) at the distal end, the tube wall of the inner tube bending section (110) is provided with a plurality of inner tube deformation grooves, the inner tube deformation grooves enable the inner tube bending section (110) to bend towards two opposite directions, and the inner tube bending section (110) comprises an inner tube bending control section (110 a) which protrudes outwards from the distal end opening of the outer tube (200); The outer tube (200) is provided with an anchoring structure capable of radial expansion or contraction with respect to the outer tube (200), the anchoring structure being capable of anchoring to an inner wall of a blood vessel in an expanded state; The bending control support tube (300) is sleeved on the periphery of the inner tube bending control section (110 a), the distal end of the bending control support tube (300) is connected with the distal end of the inner tube bending control section (110 a), the distal end of the outer tube (200) is fixedly connected with the bending control support tube (300), and the elastic modulus of the bending control support tube (300) is smaller than that of the inner tube (100); The handle (400) is provided with an inner tube pushing member (440) for applying axial force to the inner tube (100), when the outer tube (200) is anchored to the inner wall of a blood vessel through an anchoring structure thereon, the inner tube pushing member (440) applies axial force to the inner tube (100), and the inner tube bending control section (110 a) bends under the action of the axial force and the supporting force applied by the bending adjustment support tube (300); The bending support tube (300) includes: The elastic tube (310) has elasticity, the distal end of the elastic tube is fixedly connected with the distal end of the inner tube bending control section (110 a), and the proximal end of the elastic tube is fixedly connected with the distal end of the outer tube (200); the bending-adjusting flat wire (320) is elastic, the far end of the bending-adjusting flat wire is fixedly connected with the inner tube bending-controlling section (110 a), the near end of the bending-adjusting flat wire is fixedly connected with the outer tube (200), and the bending-adjusting flat wire (320) is positioned on the inner side of the elastic tube (310).
2. The adjustable bend catheter according to claim 1, wherein the outer tube (200) is a double lumen tube, the inner tube (100) passes through an inner lumen (210) of the double lumen tube, a balloon liquid injection cavity (230) is further provided inside the outer tube (200), the anchoring structure is an anchoring balloon (220) connected to an outer wall of the outer tube (200), an inner cavity of the anchoring balloon (220) is communicated with the balloon liquid injection cavity (230), and a balloon liquid injection port (510) is provided at a proximal end of the balloon liquid injection cavity (230).
3. The adjustable bend catheter of claim 2, wherein the handle (400) comprises: A handle body (410); The outer tube fixing piece (420) is arranged in the handle main body (410) and fixedly connected with the proximal end of the outer tube (200), and the outer tube fixing piece (420) and the handle main body (410) are kept in relative axial fixing and relative circumferential rotation; the inner tube fixing piece (430) is arranged in the handle main body (410) and fixedly connected with the proximal end of the inner tube (100), and the inner tube fixing piece (430) and the outer tube fixing piece (420) are kept in relative axial sliding and relative circumferential fixed arrangement; and the adjusting knob (450) is connected to the distal end of the handle main body (410) and fixedly connected with the outer tube fixing piece (420) and is used for driving the outer tube fixing piece (420) to axially rotate around the outer tube fixing piece.
4. The adjustable bend catheter according to claim 1, wherein the bottom of the inner tube pushing member (440) is provided with an axial stopper, and the proximal end and the distal end of the handle (400) are provided with a locking member for locking the axial stopper to keep the adjustable bend catheter in the current bent state.

Description

Adjustable curved pipe Technical Field The invention relates to the technical field of interventional medical instruments, in particular to an adjustable bent catheter. Background The adjustable catheter is a medical instrument widely used in interventional therapy, and is mainly used for guiding other medical instruments (such as guide wires, catheters, electronic elements and the like) or fluid into a human body to reach a target site for diagnosis or treatment operation. During operation, the operator needs to bend and adjust the adjustable bend catheter to accommodate complex anatomy and surgical path, thereby improving the safety and effectiveness of the procedure. The bending structure of the existing bending-adjustable catheter is mainly composed of a catheter tube body in a hypotube form or a snake bone tube form and a plurality of traction wires, wherein the traction wires are fixed with the catheter tube body, and the bending of the catheter is realized by controlling the traction wires. However, the traction wire is adopted to realize the bending-adjustable guide pipe, and the problems of fracture of the traction wire or connection failure of the traction wire and the guide pipe body are easy to occur. Disclosure of Invention Therefore, the invention aims to provide an adjustable bent catheter for interventional blood vessels, which solves the problems that a traction wire in the existing adjustable bent catheter is easy to break and the connection failure between the traction wire and a catheter body is easy to occur. In order to solve the technical problems, the technical scheme of the invention is as follows: an adjustable bend catheter comprises an inner tube, an outer tube, a bending support tube and a handle, wherein the inner tube passes through the inner cavity of the outer tube, and the proximal ends of the inner tube and the outer tube are connected with the handle; The inner tube comprises an inner tube bending section positioned at the far end, the tube wall of the inner tube bending section is provided with a plurality of inner tube deformation grooves, the inner tube deformation grooves enable the inner tube bending section to bend towards two opposite directions, and the inner tube bending section comprises an inner tube bending control section which extends outwards from a far end opening of the outer tube; the outer tube is provided with an anchoring structure capable of expanding or contracting radially relative to the outer tube, and the anchoring structure can be anchored to the inner wall of a blood vessel in an expanded state; the bending regulating support pipe is sleeved on the periphery of the inner pipe bending control section, the distal end of the bending regulating support pipe is connected with the distal end of the inner pipe bending control section, the pipe section of the outer pipe positioned at the distal end of the anchoring structure is fixedly connected with the bending regulating support pipe, and the elastic modulus of the bending regulating support pipe is smaller than that of the inner pipe; When the outer tube is anchored to the inner wall of a blood vessel through an anchoring structure on the outer tube, the inner tube pushing piece is used for applying axial acting force to the inner tube, the inner tube bending control section bends under the action of the axial acting force and supporting force applied by the bending control support tube, and the bending control support tube bends along with the bending of the inner tube. Further, the outer tube is a double-cavity tube, the inner tube passes through the inner lumen of the double-cavity tube, a balloon liquid injection cavity is further formed in the outer tube, the anchoring structure is an anchoring balloon connected to the outer wall of the outer tube, the inner cavity of the anchoring balloon is communicated with the balloon liquid injection cavity, and a balloon liquid injection port is formed in the proximal end of the balloon liquid injection cavity. Further, the inner tube is a metal tube, a PTFE inner liner layer is arranged on the inner side of the metal tube, a polymer coating layer is arranged on the outer side of the metal tube, and the outer tube is a polymer double-cavity tube. Further, the bending support tube includes: The elastic tube is elastic, the distal end of the elastic tube is fixedly connected with the distal end of the inner tube bending control section, and the proximal end of the elastic tube is fixedly connected with the distal end of the outer tube; The bending-adjusting flat wire is provided with rebound resilience, the far end of the bending-adjusting flat wire is fixedly connected with the inner tube bending-controlling section, the near end of the bending-adjusting flat wire is fixedly connected with the outer tube, and the bending-adjusting flat wire is positioned on the inner side of the elastic tube. Further, the elastic tube comprises a polymer braided tube and