Magnetic positioning adjustable bending type visual sheath tube

Abstract

The utility model discloses a magnetic positioning adjustable bending type visual sheathing canal, which relates to the technical field of medical instruments and comprises a handle, a bending adjusting component and a canal body, the bending adjusting component is mounted on the handle, one end of the canal body is connected with the handle, and the axis of the handle and the axis of the canal body are collinear; the tube body comprises a bending adjusting section, a connecting section and a head end which are integrated, one end of the connecting section is connected with the handle, the other end of the connecting section is connected with one end of the bending adjusting section, the head end is located at the end of the other end of the bending adjusting section and located at the far end of the tube body, and the bending adjusting assembly controls the bending direction and the bending degree of the bending adjusting section; the sheathing canal is further provided with a plurality of electrodes and a magnetic sensor, and the multiple electrodes are arranged on the bending adjusting section in a sleeving mode at intervals and used for sensing position signals of an electric field. The magnetic sensor is installed at the head end and used for sensing a position signal of the magnetic field area. The magnetic positioning adjustable bending type visual sheathing canal disclosed by the utility model is more accurate in positioning.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a magnetically positioned adjustable bending visual sheath tube. Background Art

[0002] The magnetic positioning curved visual sheath is a sheath with comprehensive performance. Its performance and safety are basically the same, but its controllability and flexibility in adapting to symptoms are better. In three-dimensional surgery, the spatial form of various surgical instruments can be visualized, and the real-time tracking performance can be performed. According to the individual differences in the human anatomical structure, the shape and angle of the sheath can be adjusted in time through the external handle to adapt to different lesions. It can also be directly inserted into the coronary artery to deliver guide wires, balloons, stents and other instruments, which is not only conducive to the smooth progress of the surgical operation and improve the success rate of the operation, but also can significantly reduce potential surgical complications and cardiovascular events.

[0003] At present, the CN108158571A patent proposes a controllable guide sheath with annular electrodes and a related construction method. The guide sheath has improved pushability and flexural properties, and has minimized the risk of kinking or buckling to achieve improved controllability and manipulability. The guide sheath is also equipped with annular electrodes for electrical sensing, mapping and visualization, and an improved shaft structure that protects the annular electrode leads without hindering the pushability and flexural properties of the shaft. In addition, the hemostatic valve of the guide sheath is configured to releasably hold the catheter in place without the risk of introducing air into the guide sheath. When providing these characteristic structures, the shaft of the guide sheath is configured to effectively utilize the space that does not include the catheter path size.

[0004] Patent CN213283248U proposes an adjustable sheath tube, comprising a slender tube body and a handle arranged at the proximal end of the slender tube body, a sealing mechanism is arranged in the handle, the sealing mechanism comprises a sealing structure with a slit and a membrane structure with a hole, the distal end of the sealing structure is divided into a duckbill structure, the slit is arranged at the distal end of the duckbill structure, the closing line of the slit and the center line of the hole are on the same plane, the adjustable sheath tube can not only realize the blood sealing effect, but also accurately control the bending direction of the distal end of the sheath tube, so that the bending plane of the distal end of the sheath tube is parallel to the doctor's operating plane, which is convenient for the doctor to operate.

[0005] CN212522006U relates to a medical catheter and a three-dimensional magnetic positioning system, the three-dimensional magnetic positioning system includes a positioning device and a medical catheter, the medical catheter includes a catheter body, a first magnetic sensor and a second magnetic sensor, the catheter body includes a head end pipe section, an adjustable bend section and a non-adjustable bend section connected axially in sequence, and the first and second magnetic sensors are fixedly arranged inside the adjustable bend section. The positioning device includes a positioning processing unit and a display unit; the first and second magnetic sensors are respectively connected to the positioning processing unit for communication; the positioning processing unit obtains the posture information of the first and second magnetic sensors, and obtains the posture information of the head end pipe section based on the posture information of the first and second magnetic sensors; the display unit receives the posture information of the head end pipe section and displays it. The advantage of the utility model is that the position of the head end pipe section can be accurately located, thereby improving the positioning accuracy of the medical catheter and the safety of interventional surgery.

[0006] The existing sheath has the following disadvantages:

[0007] (1) The existing sheath tip has one or more magnetic sensors but no electrodes, which makes it impossible to visualize the sheath bend;

[0008] (2) The existing visual sheath with a ring electrode or microelectrode at the front end of the sheath does not have a magnetic sensor, and the positioning accuracy of the sheath in the three-dimensional system is low when there is no magnetic positioning catheter.

[0009] (3) When the existing sheath is bent, wrinkles may appear at the position where the guide wire is located, which may cause a risk of scratching the blood vessel when the sheath enters the blood vessel. Utility Model Content

[0010] In view of the above technical problems to be solved, the utility model provides a magnetically positioned adjustable bendable visual sheath.

[0011] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0012] A magnetic positioning adjustable bending type visual sheath tube, comprising a handle, a bending adjustment assembly and a tube body, wherein the bending adjustment assembly is mounted on the handle, one end of the tube body is connected to the handle, and the axis of the handle is colinear with the axis of the tube body; the tube body comprises an integral bending adjustment section, a connecting section and a head end, one end of the connecting section is connected to the handle, and the other end is connected to one end of the bending adjustment section, the head end is located at the end of the other end of the bending adjustment section, and the head end is located at the distal end of the tube body, and the bending adjustment assembly controls the bending direction and degree of the bending adjustment section;

[0013] The sheath tube is also provided with electrodes and magnetic sensors. The electrodes are provided in plurality and are spaced apart in the bending section to sense position signals of the electric field. The magnetic sensor is installed at the head end to sense position signals of the magnetic field area.

[0014] As a further improvement of the above technical solution:

[0015] Preferably, the tube body comprises an inner lining, an inner layer material, a braided layer and an outer layer from the inside to the outside, the inner lining is a thin-walled structure, the central inner cavity of the tube body is surrounded by the inner lining, the braided layer is embedded between the inner layer material and the outer layer, and the braided layer surrounds the inner lining and extends along its length.

[0016] Preferably, the tube is also provided with a wire pulling cavity and a wire guiding cavity, and the wire pulling cavity and the wire guiding cavity are arranged between the braided layer and the outer layer. There are two wire pulling cavities, which are arranged along the length direction of the tube body and are respectively located on both sides of the radial direction of the tube body. There are two wire guiding cavities, which are arranged along the axial direction of the tube body and are respectively located on both sides of the radial direction of the tube body. The two wire guiding cavities are spaced apart from the wire pulling cavity.

[0017] Preferably, the pull wire cavity is configured as a first pull wire cavity and a second pull wire cavity, and the first pull wire cavity and the second pull wire cavity respectively contain a short pull wire and a long pull wire, and the proximal ends of the short pull wire and the long pull wire are fixed on the bending adjustment assembly in the handle, and the short pull wire and the long pull wire are located on both sides of the tube body.

[0018] Preferably, two guide wire cavities are provided, and the guide wire cavities are arranged along the axial direction of the tube body and are respectively located on both sides of the radial direction of the tube body, and the two guide wire cavities are spaced apart from the wire pulling cavity.

[0019] Preferably, one end of the wire cavity is located at the proximal end of the connecting section, and the other end is located at the proximal end of the bending section; the wire cavity is set as a first wire cavity and a second wire cavity, the first wire cavity is a magnetic sensor wire cavity, used for passing the magnetic sensor wire, and the second wire cavity is an electrode wire cavity, used for passing the electrode wire.

[0020] Preferably, the magnetic sensor wire cavity is located in the braided layer close to the inner layer material, the electrode wire cavity is located in the braided layer close to the outer layer, the distal end of the electrode wire is connected to the electrode, the distal end of the magnetic sensor wire is connected to the magnetic sensor, and the proximal ends of the electrode wire and the magnetic sensor wire are connected to the electrical connector of the sheath.

[0021] Preferably, a section of the electrode wire extending out of the electrode wire cavity is in a non-linear shape; a section of the magnetic sensor wire extending out of the magnetic sensor wire cavity is in a non-linear shape.

[0022] Preferably, the bending adjustment assembly includes a control unit and a reversing unit, the control unit is arranged at the distal end of the handle, the control unit can rotate relative to the handle when in use, and cannot move relative to the handle; the reversing unit is located inside the handle, the reversing unit is connected to the short pull wire and the long pull wire, and the short pull wire and the long pull wire are respectively arranged on both sides of the reversing unit.

[0023] Compared with the prior art, the magnetic positioning adjustable curved visual sheath provided by the utility model has the following advantages:

[0024] (1) The magnetic positioning adjustable curved visual sheath of the utility model forms a stable geometric rigid distance relationship between the magnetic sensor and the electric positioning electrode pair, cooperates with the magnetic field generator and the surface electrode sheet to construct a mapping relationship between the magnetic field coordinates and the electric field coordinates, thereby displaying the spatial positions of all the annular electrodes on the sheath, obtaining more accurate positioning information, and further cooperating with the heart's three-dimensional positioning navigation system to indicate the relative position and shape of the sheath in the heart cavity.

[0025] (2) In the magnetically positioned adjustable bending visual sheath of the utility model, the electrode wire and the magnetic sensor wire extend in a spiral manner along the axial direction of the tube body. This extension method effectively solves the problem of wrinkles on the surface of the bending section when the sheath is bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] Figure 2 for Figure 1 Schematic diagram of the AA cross-section structure.

[0028] Figure 3 for Figure 1 Schematic diagram of the BB cross-section structure.

[0029] Figure 4 It is a structural schematic diagram of the pipe body of the utility model.

[0030] Figure 5 This is a schematic diagram of the utility model when it is applied and used.

[0031] Description of the numbers in the figure:

[0032] 1. Handle; 11. Shell; 12. Hollow tube; 13. Pulley frame; 14. Hemostatic valve; 15. Three-way switch; 2. Bending assembly; 21. Knob; 22. Inner tube; 23. Moving rod; 24. Fixed pulley; 3. Tube body; 31. Bending section; 311. Pull ring; 32. Connecting section; 33. Head end; 34. Lining; 35. Inner layer material; 36. Braided layer; 37. Outer layer; 38. Wire pulling cavity; 381. First wire pulling cavity; 382. Second wire pulling cavity; 39. Wire cavity; 391. Magnetic sensor wire cavity; 392. Electrode wire cavity; 4. Ring electrode; 5. Magnetic sensor; 6. Electrode wire; 7. Magnetic sensor wire; 8. Short pull wire; 9. Long pull wire; 10. Electrical connector. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0034] Figures 1 to 5 An embodiment of the magnetic positioning adjustable bending type visual sheath of the utility model is shown, comprising a handle 1, a bending adjustment component 2 and a tube body 3, wherein the bending adjustment component 2 is mounted on the handle 1, and one end of the tube body 3 is connected to the handle 1. The axis of the handle 1 is colinear with the axis of the tube body 3 for easy holding and operation.

[0035] In this embodiment, the tube body 3 includes an integrated bending section 31, a connecting section 32, and a head end 33. One end of the connecting section 32 is connected to the handle 1, and the other end is connected to one end of the bending section 31. The head end 33 is located at the end of the other end of the bending section 31. The head end 33 is located at the distal end of the tube body 3, and the bending component 2 controls the bending direction and degree of the bending section 31. The connection method between the bending component 2 and the bending section 31 is not limited, and a known method in the prior art can be adopted, as long as the bending component 2 can drive the bending section 31 to bend when it is in action.

[0036] It is well known that the proximal end and the distal end refer to the distance relative to the operator (ie, the doctor), the end close to the operator is the proximal end, and the end far from the operator is the distal end.

[0037] In this embodiment, the sheath is also provided with electrodes and a magnetic sensor 5. The electrode is a ring electrode 4, and a plurality of ring electrodes 4 are provided, the number of which is even, and they are spaced and sleeved on the bending section 31, respectively, for sensing the position signal of the electric field. The magnetic sensor 5 is installed at the head end 33, and is used to sense the position signal of the magnetic field area. The magnetic sensor 5 is paired with at least one ring electrode 4, and a stable geometric rigid distance relationship is formed between the two, so as to obtain more accurate positioning information. Through the magnetic sensor 5 and the electrode pair for electrical positioning, in conjunction with the magnetic field generator and the surface electrode sheet, combined with the existing positioning system, the spatial positions of all the ring electrodes 4 on the sheath are displayed, and in conjunction with the three-dimensional positioning navigation system of the heart, the relative position and shape of the sheath in the heart cavity are indicated, which can more accurately reflect the position of the sheath.

[0038] In this embodiment, Figure 2 and Figure 3As shown, the tube body 3 is provided with a central lumen. The tube body 3 includes an inner liner 34, an inner layer material 35, a braided layer 36 and an outer layer 37 from the inside to the outside. The inner liner 34 is a thin-walled structure, and the central lumen is surrounded by the inner liner 34. The material composition of the inner liner 34 is not limited, including, for example, polytetrafluoroethylene (PTFE). The braided layer 36 is embedded between the inner layer material 35 and the outer layer 37. The braided layer 36 surrounds the inner liner 34 and extends along its length to provide a balance between pushability and improved flexural properties for the tube body 3. The strands or fibers of the braided layer 36 can be made of any suitable material, such as a high-strength polymer. The outer layer 37 is arranged on the braided layer 36 along the length direction of the tube body 3 and plays a sealing role. The outer layer 37 uses materials of different hardness in different sections of the tube body 3 to provide different flexural properties.

[0039] Furthermore, the pipe is also provided with a wire pulling cavity 38 and a wire guiding cavity 39, which are arranged between the braided layer 36 and the outer layer 37, or inserted in the braided layer 36, and the cavity shapes of the wire pulling cavity 38 and the wire guiding cavity 39 are set according to the needs, and are generally non-circular cross-sections. Preferably, the cross-section of the wire pulling cavity 38 is rectangular, and the area is slightly about the diameter of the wire pulling cavity. In this embodiment, two wire pulling cavities 38 are provided, which are arranged along the length direction of the tube body 3 and are respectively located on both sides of the radial direction of the tube body 3, that is, the two wire pulling cavities 38 are spaced 180 degrees relative to the tube body 3, and each wire pulling cavity 38 is provided with a wire pulling cavity. One end of the wire pulling cavity 38 is located at the proximal end of the connecting section 32, and the other end is located at the connection between the head end 33 and the bending section 31.

[0040] For the convenience of explaining the structure, the wire pulling cavity 38 is set as a first wire pulling cavity 381 and a second wire pulling cavity 382. The first wire pulling cavity 381 and the second wire pulling cavity 382 respectively contain a slender short wire 8 and a long wire 9. The proximal ends of the short wire 8 and the long wire 9 are fixed to the bending adjustment component 2 in the handle 1. The short wire 8 and the long wire 9 are located on both sides of the tube body 3, so that the accuracy of the bending can be ensured.

[0041] In this embodiment, the head end 33 of the pipe is further provided with a pull ring 311, which is sleeved on the distal end of the bending adjustment section 31, that is, the connection between the bending adjustment section 31 and the head end 33; that is, the pull ring 311 becomes the boundary between the head end 33 and the bending adjustment section 31. The distal ends of the short pull wire 8 and the long pull wire 9 are respectively connected to the two farthest positions on the pull ring 311, that is, the two connection points of the two pull wires and the pull ring 311 are located on a diameter of the pull ring 311. By providing the pull ring 311, the pull wire is used to pull the bending adjustment section 31 to bend in two opposite directions.

[0042] In this embodiment, two wire cavities 39 are provided, and the wire cavities 39 are arranged along the axial direction of the tube body 3, respectively located on both sides of the radial direction of the tube body 3, and the two wire cavities 39 are arranged at intervals from the wire pulling cavity 38. Preferably, based on the tube body 3, the wire cavity 39 and the wire pulling cavity 38 are spaced 90 degrees apart, and the two wire cavities 39 are spaced 180 degrees apart. Preferably, the shape of the wire cavity 39 is determined according to the number of wires, and one wire cavity 39 can be provided with one or more wires, or the wire cavity 39 can be divided into multiple sub-cavities, and each wire is located in an independent sub-cavity to avoid mutual influence.

[0043] Further, one end of the wire cavity 39 is located at the proximal end of the connecting section 32, and the other end is located at the proximal end of the bending section 31. For the convenience of explaining the structure, the wire cavity 39 is set as a first wire cavity and a second wire cavity, the first wire cavity is located in the braided layer 36 close to the inner layer material 35, and the second wire cavity is located in the braided layer 36 close to the outer layer 37. The first wire cavity is a magnetic sensor wire cavity 391, which is used to pass the magnetic sensor wire 7, and the second wire cavity is an electrode wire cavity 392, which is used to pass the electrode wire 6. The electrode wire cavity 392 is located in the braided layer 36 close to the outer layer 37 for easy connection with the annular electrode 4.

[0044] In this embodiment, each annular electrode 4 corresponds to an electrode wire 6, and the proximal end of the electrode wire 6 extends from the tail end of the sheath tube to be connected to the electrical connector 10 of the sheath tube. After the distal end of the electrode wire 6 passes through the electrode wire cavity 392, its end passes through the outside of the outer layer 37 to be connected to the corresponding annular electrode 4, and a section of the electrode wire extending from the electrode wire cavity 392 is in a non-linear form. Preferably, the electrode wire extends from the wire cavity to the annular electrode 4 in a spiral or wavy form, and is woven between the braided layer 36 and the inner layer material 35. The electrode wire extends in a spiral manner along the axial direction of the tube body 3 in the tube body 3. This extension method effectively solves the problem of wrinkles on the surface of the bending section 31 when the sheath tube is bent. The electrode wire transmits the electrical signal sensed by the annular electrode 4 to the remote system through the electrical connector 10 located on the proximal side of the handle 1.

[0045] In this embodiment, the proximal end of the magnetic sensor wire 7 extends from the tail end of the sheath tube and is connected to the electrical connector 10 of the sheath tube. The distal end of the magnetic sensor wire 7 passes through the rear end of the magnetic sensor wire cavity 391 and is connected to the magnetic sensor, and a section of the magnetic sensor wire 7 extending from the magnetic sensor wire cavity 391 is in a non-linear form. Preferably, a section of the magnetic sensor wire 7 extending from the wire cavity to the annular electrode 4 is in a spiral or wavy form and is woven between the braided layer 36 and the outer layer 37. The magnetic sensor wire 7 extends axially along the tube body 3 in the magnetic sensor wire cavity 391, and is used to transmit the magnetic field area position signal sensed by the magnetic sensor, and the proximal end of the magnetic sensor extends from the tail end of the sheath tube.

[0046] In this embodiment, the bending adjustment assembly 2 includes a control unit and a reversing unit. The control unit is arranged at the distal end of the handle 1. Part of the control unit is located outside the handle 1. When in use, it can rotate relative to the handle 1, but cannot move. The reversing unit is located inside the handle 1. The reversing unit is connected to the short pull wire 8 and the long pull wire 9, and the short pull wire 8 and the long pull wire 9 are respectively arranged on both sides of the reversing unit. The handle 1 is provided with a shell 11 and a hollow tube 12 located at the axis. The proximal end of the hollow tube 12 is connected to the hemostatic valve outside the handle 1, and the distal end of the hollow tube 12 is connected to the proximal end of the tube body 3.

[0047] like Figure 2 As shown, in this embodiment, the control unit includes a knob 21 and an inner tube 21, and the distal housing 11 of the handle 1 is located between the knob 21 and the inner tube 21. The housing 11 at the distal end of the handle 1 is provided with a plurality of outer convex rings, and the knob 21 is provided with a plurality of inner concave ring grooves that cooperate with the outer convex rings, so that the knob 21 can rotate relative to the handle 1. The inner tube 21 is provided with an internal thread, and the length of the inner tube 21 is greater than that of the knob 21, and the inner tube 21 extends into the handle 1. A sealing ring is provided between the knob 21 and the hollow tube 12. When the knob 21 rotates, the inner tube 21 is driven to rotate together.

[0048] In this embodiment, the reversing unit includes a moving rod 23 and a fixed pulley 24. A pulley frame 13 is provided in the handle 1, and the fixed pulley 24 is installed on the pulley frame 13. The installation position of the fixed pulley 24 is close to the proximal end of the handle 1 relative to the moving rod 23. The moving rod 23 is provided with an external thread that matches the inner cylinder 21, and part of the moving rod 23 is sleeved with the inner cylinder 21. When the inner cylinder 21 rotates, the moving rod 23 moves axially along the handle 1. The short pull wire 8 and the long pull wire 9 pass through the hollow tube 12 and come out from the proximal end of the moving rod 23. The proximal end of the short pull wire 8 passes through the control unit and is connected to the proximal end of the moving rod 23. The proximal end of the long pull wire 9 passes through the control unit and the moving rod 23, and then bypasses the fixed pulley 24 and is connected to the proximal end of the moving rod 23.

[0049] In this embodiment, when the knob 21 is rotated in a first direction (e.g., clockwise), the moving rod 23 is driven to move toward the proximal end of the handle 1, the moving rod 23 tightens the short pull wire 8, and loosens the long pull wire 9, the long pull wire 9 is relaxed, and the pulling on the bending section 31 is released, and the bending section 31 deflects and bends toward the side connected to the short pull wire 8. When the knob 21 is rotated in a second direction (e.g., counterclockwise) opposite to the first direction, the moving rod 23 is driven to move toward the distal end of the handle 1, the moving rod 23 tightens the long pull wire 9, and loosens the short pull wire 8, the short pull wire 8 is relaxed, and the pulling on the bending section 31 is released, and the bending section 31 deflects and bends toward the side connected to the long pull wire 9. That is, when the knob 21 is rotated in the clockwise direction and the counterclockwise direction respectively, the bending section 31 is driven to bend toward opposite sides, thereby realizing the bidirectional adjustable bending of the bending section 31, and improving the performance of the visual adjustable bending guide sheath.

[0050] In this embodiment, a hemostatic valve is connected to the proximal end of the handle, and the hemostatic valve 14 is connected to a three-way switch 15 with a Luer connector.

[0051] The above implementation cases are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A magnetically positioned adjustable bending visual sheath, characterized in that: The invention comprises a handle, a bending adjustment assembly and a tube body, wherein the bending adjustment assembly is installed on the handle, one end of the tube body is connected to the handle, and the axis of the handle is colinear with the axis of the tube body; the tube body comprises an integral bending adjustment section, a connecting section and a head end, one end of the connecting section is connected to the handle, and the other end is connected to one end of the bending adjustment section, the head end is located at the end of the other end of the bending adjustment section, and the head end is located at the far end of the tube body, and the bending adjustment assembly controls the bending direction and degree of the bending adjustment section; The sheath tube is also provided with electrodes and magnetic sensors. The electrodes are provided in plurality and are spaced apart and sleeved in the bending section for sensing position signals of the electric field. The magnetic sensor is installed at the head end for sensing position signals of the magnetic field area.

2. The magnetic positioning adjustable bending type visual sheath according to claim 1, characterized in that: The tube body includes an inner lining, an inner layer material, a braided layer and an outer layer from the inside to the outside. The inner lining is a thin-walled structure. The central inner cavity of the tube body is surrounded by the inner lining. The braided layer is embedded between the inner layer material and the outer layer. The braided layer surrounds the inner lining and extends along its length.

3. The magnetic positioning adjustable bending type visual sheath according to claim 2, characterized in that: The tube body is also provided with a wire pulling cavity and a wire guiding cavity, which are arranged between the braided layer and the outer layer. There are two wire pulling cavities, which are arranged along the length direction of the tube body and are respectively located on both sides of the radial direction of the tube body. There are two wire guiding cavities, which are arranged along the axial direction of the tube body and are respectively located on both sides of the radial direction of the tube body. The two wire guiding cavities are spaced apart from the wire pulling cavity.

4. The magnetic positioning adjustable bending type visual sheath according to claim 3, characterized in that: The wire pull cavity is configured as a first wire pull cavity and a second wire pull cavity, wherein a short pull wire and a long pull wire are respectively arranged in the first wire pull cavity and the second wire pull cavity, wherein the proximal ends of the short pull wire and the long pull wire are fixed on the bending adjustment assembly in the handle, and the short pull wire and the long pull wire are located on both sides of the tube body.

5. The magnetic positioning adjustable bending type visual sheath according to claim 3, characterized in that: One end of the wire cavity is located at the proximal end of the connecting section, and the other end is located at the proximal end of the bending section; the wire cavity is set as a first wire cavity and a second wire cavity, the first wire cavity is a magnetic sensor wire cavity, used for passing the magnetic sensor wire, and the second wire cavity is an electrode wire cavity, used for passing the electrode wire.

6. The magnetic positioning adjustable bending type visual sheath according to claim 5, characterized in that: The magnetic sensor wire cavity is located in the braided layer close to the inner layer material, the electrode wire cavity is located in the braided layer close to the outer layer, the distal end of the electrode wire is connected to the electrode, the distal end of the magnetic sensor wire is connected to the magnetic sensor, and the proximal ends of the electrode wire and the magnetic sensor wire are connected to the electrical connector of the sheath.

7. The magnetic positioning adjustable bending type visual sheath according to claim 6, characterized in that: A section of the electrode wire extending out of the electrode wire cavity is in a non-linear shape; a section of the magnetic sensor wire extending out of the magnetic sensor wire cavity is in a non-linear shape.

8. The magnetic positioning adjustable bending type visual sheath according to claim 4, characterized in that: The bending adjustment assembly includes a control unit and a reversing unit. The control unit is arranged at the distal end of the handle. When in use, the control unit can rotate relative to the handle but cannot move relative to the handle. The reversing unit is located inside the handle. The reversing unit is connected to a short pull wire and a long pull wire, and the short pull wire and the long pull wire are respectively arranged on both sides of the reversing unit.

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