Bending-adjustable sheathing canal and use method thereof

Abstract

The invention discloses an adjustable bending sheathing canal and a using method thereof, and relates to the technical field of medical instruments, the adjustable bending sheathing canal has the advantage of reducing the possibility that a catheter suddenly turns due to overexertion during fine adjustment, and the technical scheme is characterized in that the adjustable bending sheathing canal comprises an inner lining tube, an inner adjusting bending tube, an outer adjusting bending tube and a sheath tube, and the sheath tube is nested outside the outer adjusting bending tube; the bending-adjustable sheathing canal further comprises a control mechanism, the control mechanism comprises a grip, a control groove is formed in the middle of an inner cavity of the grip, a connecting groove communicated with the control groove is formed in one end of the grip, and an extending groove communicated with the control groove is formed in the other end of the grip. And a moving assembly for controlling the external adjusting bent pipe to move along the center line direction of the grip is matched in the control groove.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an adjustable bending sheath tube and a method for using the same. Background Art

[0002] An aneurysm is a pathological dilation of the arterial wall. As the aneurysm grows, the risk of blood vessel rupture increases. Once an aneurysm ruptures, patients often die due to massive bleeding. Clinically, implantation of a tubular covered stent vascular prosthesis is an important means for treating arterial reconstruction. However, when an aneurysm occurs in locations with branched structures such as the thoracic aorta, abdominal aorta, and iliac artery, the blood vessel structure cannot be simply reconstructed by using a single tubular covered stent.

[0003] In recent years, the in-situ fenestration technique of covered stents has been gradually applied in aortic branch reconstruction. This technique involves making an opening in the covering film at the position corresponding to the branch blood vessel after the tubular covered stent is implanted into the blood vessel, using a sharp needle or thermal laser, and then implanting a branch stent through the opening to achieve the purpose of branch reconstruction. In the in-situ fenestration technique, the accuracy of the opening position and direction is crucial for the safety and effectiveness of the surgery. Deviations in position and direction may cause the implanted branch stent to be distorted or bent, thereby affecting the long-term patency rate of the stent. Clinically, an adjustable bending sheath tube can be controlled by an operator through a driving handle to deflect the distal end of the catheter, so as to guide the movement and energy delivery direction of the in-situ fenestration instrument, and is an important tool for assisting in-situ fenestration.

[0004] The Chinese patent with the reference application number CN117138201A discloses an adjustable bending device. Through the design of an inner driving tube, an outer driving tube, an inner sleeve tube, and an outer sleeve tube, the inner driving tube, the outer driving tube, the inner sleeve tube, and the outer sleeve tube have good bending strength and torsion control, and can achieve two-way bending. When an operator holds the holding part with one hand and rotates the rotating part clockwise with the other hand, the rotating part drives the threaded driving part to rotate circumferentially, thereby driving the transmission unit to axially move from the proximal end to the distal end, thereby driving the inner driving tube to deflect upward, and the outer driving tube, the inner sleeve tube, and the outer sleeve tube also deflect upward accordingly.

[0005] The adjustable bending medical catheter disclosed in the Chinese patent with the application number CN206762020U makes the bending driving assembly move axially along the rotating cylinder under the action of the tooth grooves of the rotating cylinder by rotating the rotating cylinder. The bending driving assembly transmits force and displacement to the traction wire, drives the traction wire to axially move in the same direction relative to the tube body, and then transmits the force and displacement to the anchoring ring.

[0006] In the above applications, the rotation of the rotating part or the rotating cylinder is manually controlled by medical staff to achieve the distal bending of the sheath tube. During tumor interventional therapy, more emphasis is placed on the precise positioning of the catheter. The blood supply arteries of liver tumors are often hidden in a complex vascular network, and doctors need to repeatedly fine-tune the catheter angle, sometimes even to a precision of millimeters. However, the existing adjustable bending sheath tubes have problems such as insufficient adjustment precision in manual control and the catheter suddenly turning due to excessive force during fine-tuning. Summary of the Invention

[0007] Aiming at the above technical deficiencies, the purpose of the present invention is to provide an adjustable bending sheath tube and its usage method, which have the advantage of reducing the possibility of the catheter suddenly turning due to excessive force during fine-tuning.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides an adjustable bending sheath tube, including an inner liner tube, an inner bending tube, an outer bending tube, and a protective sleeve. The protective sleeve is nested outside the outer bending tube, the outer bending tube is nested outside the inner bending tube, and the inner bending tube is nested outside the inner liner tube. It is characterized in that: the adjustable bending sheath tube further includes a control mechanism, including a handle. A control groove is provided in the middle position of the inner cavity of the handle. A connection groove communicating with the control groove is provided at one end of the handle, and an extension groove communicating with the control groove is provided at the other end. A moving component for controlling the movement of the outer bending tube along the central line direction of the handle is fitted in the control groove. A driving mechanism, including a mounting seat provided obliquely above the handle and integrally structured with the handle. A through hole is provided in the middle position of the inner cavity of the mounting seat. A driving shaft passing through the mounting seat and rotatably connected to the mounting seat is provided in the middle position of the inner cavity of the through hole. A driving gear coaxially fixed to the driving shaft is nested outside the driving shaft. The driving gear is located in the through hole and extends out of the mounting seat through the through hole. A speed reduction mechanism, including a support seat integrally structured with the handle. A speed reduction groove communicating with the connection groove is provided in the inner cavity of the support seat. The bottom end of the driving shaft extends into the speed reduction groove and is rotatably connected to the support seat. A speed reduction component connecting the driving shaft and the moving component is provided in the speed reduction groove.

[0009] By adopting the above technical solutions, the staff manually rotates the driving gear to provide power, driving the driving shaft coaxially fixed to the driving gear to rotate. By setting the speed reduction component, the rotation of the driving shaft drives the moving component to move, and at the same time slows down the movement speed of the moving component, reducing the moving speed of the outer bending tube along the central line direction of the handle, reducing the possibility of the inner liner tube, the inner bending tube, the outer bending tube, and the protective sleeve suddenly turning due to excessive force during the operation of medical staff, and improving the safety of the device.

[0010] Preferably, the moving component includes two ear seats fixedly and oppositely arranged at the bottom of the control groove. Each ear seat is penetrated by a circular hole. A moving rod is arranged between the two ear seats. Both ends of the moving rod penetrate through the adjacent ear seats through the circular holes and are slidably connected with the ear seats. The proximal end of the inner adjusting elbow is fixedly connected with the adjacent end of the moving rod. The inner lining tube penetrates through the moving rod and is slidably connected with the moving rod. One end of the inner lining tube passing through the moving rod passes through the handle through the extension groove. An active component for cooperating with the moving rod to control the movement of the moving rod along the central line direction of the handle is arranged in the control groove.

[0011] Preferably, the active component includes an internal gear ring fixedly connected with the groove wall of the control groove and coaxially arranged with the handle. Each ear seat is penetrated by a sleeve. The outer wall of the sleeve is rotatably connected with the inner wall of the circular hole. Both ends of the sleeve penetrate through the ear seat. One end of the sleeve passing through the ear seat is fixedly connected with a swing rod. The sleeve and the swing rod are sleeved outside the moving rod and are slidably connected with the moving rod. The ends of the two swing rods away from the moving rod are fixedly connected through a driving worm. An active gear coaxially fixed with the driving worm and meshing with the internal gear ring is nested outside the driving worm. A driven worm coaxially fixed with the moving rod is nested outside the moving rod. The driven worm meshes with the driving worm.

[0012] Preferably, the speed reduction component includes a first reduction gear, a second reduction gear, a third reduction gear, a first follower shaft, a fourth reduction gear, a fifth reduction gear, a second follower shaft, a sixth reduction gear, a third follower shaft, a first helical gear and a second helical gear which are arranged in the installation groove and rotatably connected with the groove wall of the installation groove. The first reduction gear is nested outside the bottom end of the driving shaft and is coaxially fixed with the driving shaft. The second reduction gear is located beside the first reduction gear and meshes with the first reduction gear. The first follower shaft penetrates through the second reduction gear and is coaxially fixed with the second reduction gear. The third reduction gear is nested outside the first follower shaft and is coaxially fixed with the first follower shaft. The fourth reduction gear is located beside the third reduction gear and meshes with the third reduction gear. The second follower shaft penetrates through the fourth reduction gear and is coaxially fixed with the fourth reduction gear. The fifth reduction gear is nested outside the follower shaft and is coaxially fixed with the follower shaft. The sixth reduction gear is located outside the fifth reduction gear and meshes with the fifth reduction gear. The third follower shaft penetrates through the sixth reduction gear and is coaxially fixed with the sixth reduction gear. The first helical gear is nested outside the third follower shaft and is coaxially fixed with the third follower shaft. The second helical gear is rotatably connected with the adjacent ear seat and is coaxially fixed with the sleeve passing through the ear seat. The moving rod penetrates through the second helical gear and is slidably connected with the second helical gear.

[0013] Preferably, a limiting box is fixedly arranged on the upper surface of the mounting seat. A circular groove is formed in the inner cavity of the limiting box. The top end of the driving shaft penetrates into the circular groove and is rotatably connected with the limiting box. A limiting component for cooperating with the driving shaft to play a limiting role is arranged in the circular groove.

[0014] Preferably, a tray is rotatably connected in the circular groove. The tray is nested outside the driving shaft and fixedly connected to the driving shaft coaxially. Four oppositely arranged guide plates are integrally formed on the tray. An arc-shaped counterweight adapted to the guide plate is movably connected between every two adjacent guide plates. The outer end of the arc-shaped counterweight extends out of the tray. The arc-shaped counterweight extending out of the tray is fixed to the arc-shaped rubber block. A rubber ring adapted to the arc-shaped rubber block is fixed on the groove wall of the circular groove.

[0015] Preferably, the distal end of the protective sleeve tube is fixedly connected to the distal end of the inner lining tube and closes the gap between the distal ends of the protective sleeve tube and the inner lining tube. The inner bending tube and the outer bending tube are located in the gap between the protective sleeve tube and the inner lining tube. The distal ends of the inner bending tube and the outer bending tube are fixedly connected. The distal end of the inner bending tube is connected to the outer wall of the inner lining tube. The proximal end of the protective sleeve tube is fixedly connected to the end of the mounting seat. The proximal end of the outer bending tube extends into the speed reduction groove and is fixedly connected to the groove wall of the speed reduction groove. The inner lining tube penetrates through the handle through the extension groove.

[0016] Preferably, a plurality of first cutting grooves are uniformly formed on the outer wall of the distal end of the inner bending tube. The plurality of first cutting grooves are arranged in an array along the central line direction of the inner bending tube. A plurality of second cutting grooves are uniformly formed on the outer wall of the distal end of the outer bending tube. The plurality of second cutting grooves are arranged in an array along the central line direction of the outer bending tube. The first cutting grooves and the second cutting grooves are alternately arranged and oppositely arranged.

[0017] Preferably, the inner lining tube and the protective sleeve tube are made of elastic materials, and the inner bending tube and the outer bending tube are made of rigid materials.

[0018] A method for using an adjustable bending sheath tube includes the following steps: S1: Check the integrity of the sheath tube and pre-treat the sheath tube; S2: Puncture through the femoral artery, jugular vein or radial artery. After inserting a guide wire, send a dilator along the guide wire to pre-dilate the channel, and then withdraw the dilator; S3: Slowly push the adjustable bending sheath tube along the guide wire to the target blood vessel area, and maintain coaxiality with the guide wire to reduce friction with the blood vessel wall; S4: Combining intraoperative images, manually and slowly rotate the driving gear to adjust the bending angle of the distal end of the sheath tube and accurately point to the target blood vessel of the aneurysm; S5: After the sheath tube is bent in place, send a balloon, stent, puncture needle, microcatheter or embolization device through the sheath tube; The beneficial effects of the present invention are as follows: The staff manually rotates the driving gear to provide power, driving the driving shaft fixedly connected to the driving gear to rotate. By setting a speed reduction component, the rotation of the driving shaft will drive the movement of the moving component, and at the same time slow down the movement speed of the moving component, reducing the moving speed of the outer bending tube along the central line direction of the handle, reducing the possibility that the inner lining tube, the inner bending tube, the outer bending tube, and the protective sleeve tube suddenly turn during the operation of medical staff, and improving the safety of the device. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the overall structure of this embodiment; Figure 2 Schematic diagram of the structure of this embodiment for embodying the first cutting groove; Figure 3 Schematic diagram of the sectional view of the protective sleeve of this embodiment; Figure 4 Of this embodiment Figure 1 Enlarged structure diagram at position A; Figure 5 Schematic diagram of the structure of this embodiment for embodying the first reduction gear; Figure 6 Schematic diagram of the structure of this embodiment for embodying the first helical gear; Figure 7 Schematic diagram of the structure of this embodiment for embodying the driving worm; Figure 8 Schematic diagram of the structure of this embodiment for embodying the driving gear; Figure 9 Schematic diagram of the structure of this embodiment for embodying the arc-shaped counterweight;

[0021] Explanation of reference numerals: In the figure: 1, inner lining pipe; 2, inner bending pipe; 201, first cutting groove; 3, outer bending pipe; 4, protective sleeve; 5, grip; 501, extension groove; 6, moving assembly; 601, ear seat; 602, moving rod; 603, internal gear ring; 604, swing rod; 605, driving worm; 606, driving gear; 607, driven worm; 7, mounting seat; 701, through hole; 8, driving shaft; 9, driving gear; 10, support seat; 11, reduction assembly; 1101, first reduction gear; 1102, second reduction gear; 1103, third reduction gear; 1104, first follower shaft; 1105, fourth reduction gear; 1106, fifth reduction gear; 1107, second follower shaft; 1108, sixth reduction gear; 1109, third follower shaft; 1110, first helical gear; 1111, second helical gear; 12, limit box; 1201, circular groove; 13, limit assembly; 1301, tray; 1302, guide plate; 1303, arc-shaped counterweight. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] As used in this application, the "proximal end" refers to the end closer to the operator when the adjustable bending sheath tube is placed in a blood vessel, and the "distal end" refers to the end farther from the operator when the adjustable bending sheath tube is placed in a blood vessel.

[0024] An adjustable bending sheath tube and its using method, as Figures 1-9 , includes an inner liner tube 1, an inner bending tube 2, an outer bending tube 3, and a protective sheath tube 4. The sheath tube 4 is nested outside the outer bending tube 3, the outer bending tube 3 is nested outside the inner bending tube 2, the inner bending tube 2 is nested outside the inner liner tube 1. The distal end of the protective sheath tube 4 is fixed to the distal end of the inner liner tube 1 and closes the gap between the distal ends of the protective sheath tube 4 and the inner liner tube 1. The inner bending tube 2 and the outer bending tube 3 are located in the gap between the protective sheath tube 4 and the inner liner tube 1. The distal ends of the inner bending tube 2 and the outer bending tube 3 are fixedly connected, and the distal end of the inner bending tube 2 is connected to the outer wall of the inner liner tube 1.

[0025] As Figure 1 and Figure 2 and Figure 3 , the inner liner tube 1 and the protective sheath tube 4 are made of elastic materials, such as polymers, such as polyethylene, nylon, polyester, polyether block amide, etc. The inner bending tube 2 and the outer bending tube 3 are made of rigid materials, such as metal stainless steel, nickel-titanium alloy, etc. The inner bending tube 2 and the outer bending tube 3 are made of rigid materials to facilitate supporting the inner liner tube 1 and the protective sheath tube 4 and controlling their bending, with better support and stability. The inner liner tube 1 and the protective sheath tube 4 are made of elastic materials to facilitate bending along with the inner bending tube 2 and the outer bending tube 3, improving flexibility.

[0026] As Figure 1 and Figure 2 and Figure 3, to facilitate the control of the bending of the distal ends of the inner liner tube 1 and the protective sleeve tube 4, a number of first cutting grooves 201 are evenly formed on the outer wall of the distal end of the inner bending tube 2. The number of first cutting grooves 201 is arranged in an array along the central axis direction of the inner bending tube 2. A number of second cutting grooves are evenly formed on the outer wall of the distal end of the outer bending tube 3. The number of second cutting grooves is arranged in an array along the central axis direction of the outer bending tube 3. The first cutting grooves 201 and the second cutting grooves are alternately arranged and are arranged opposite to each other. When the inner bending tube 2 moves from the distal end to the proximal end, the distal end of the inner bending tube 2 will drive the distal ends of the outer bending tube 3, the inner liner tube 1 and the protective sleeve tube 4 to bend downward. When the inner bending tube 2 moves from the proximal end to the distal end, the inner bending tube 2 will drive the distal ends of the outer bending tube 3, the inner liner tube 1 and the protective sleeve tube 4 to bend upward. This is the existing structure, so no more details will be given here.

[0027] Such as Figure 1 and Figure 4 , a support seat 10 is provided at the proximal end of the protective sleeve tube 4. The protective sleeve tube 4 is fixed to the outer wall of the support seat 10. A speed reduction groove is formed in the inner cavity of the support seat 10. The outer bending tube 3 penetrates into the support seat 10 and is connected to the groove wall of the speed reduction groove. A handle 5 is integrally formed on one side of the support seat 10 away from the protective sleeve tube 4. A control groove is formed in the middle position of the inner cavity of the handle 5. A connection groove communicating with the control groove is formed at one end of the handle 5, and an extension groove 501 communicating with the control groove is formed at the other end. The control groove communicates with the speed reduction groove through the connection groove. After the inner bending tube 2 and the inner liner tube 1 pass through the speed reduction groove, they enter the control groove through the connection groove. The inner liner tube 1 passes through the handle 5 through the extension groove 501 and is connected to other related medical devices. The inner liner tube 1 is fixed to the extension groove 501. This is the prior art, so no more details will be given here.

[0028] Such as Figure 1 and Figure 4 and Figure 7 and Figure 8, a moving component 6 for controlling the outer adjustable elbow 3 to move along the central line direction of the handle 5 is fitted in the control groove. The moving component 6 includes two ear seats 601 fixed to the bottom of the control groove and arranged oppositely. Each ear seat 601 is penetrated by a circular hole. A moving rod 602 is arranged between the two ear seats 601. Both ends of the moving rod 602 penetrate through the adjacent ear seats 601 through the circular holes and are slidably connected with the ear seats 601. The proximal end of the inner adjustable elbow 2 is fixed to the adjacent end of the moving rod 602. The inner lining tube 1 penetrates through the moving rod 602 and is slidably connected with the moving rod 602. One end of the inner lining tube 1 passing through the moving rod 602 passes through the handle 5 through the extension groove 501. An active component for cooperating with the moving rod 602 to control the moving rod 602 to move along the central line direction of the handle 5 is arranged in the control groove. By providing power through the active component, the moving rod 602 is driven to slide on the two ear seats 601. The movement of the moving rod 602 will drive the inner adjustable elbow 2 fixed to the moving rod 602 to move, thereby driving the distal ends of the inner adjustable elbow 2 and the outer adjustable elbow 3 to bend, realizing the bending of the inner lining tube 1. The moving component 6 can also be other driving structures that drive the inner adjustable elbow 2 to move axially without affecting the inner lining tube 1.

[0029] As Figure 7 and Figure 8 , the active component includes an internal gear ring 603 fixed to the groove wall of the control groove and arranged coaxially with the handle 5. Each ear seat 601 is penetrated by a sleeve. The outer wall of the sleeve is rotatably connected with the inner wall of the circular hole. Both ends of the sleeve penetrate through the ear seat 601. One end of the sleeve passing through the ear seat 601 is fixed with a swing rod 604. The sleeve and the swing rod 604 are sleeved outside the moving rod 602 and are slidably connected with the moving rod 602. The ends of the two swing rods 604 away from the moving rod 602 are fixedly connected by a driving worm 605. An active gear 606 coaxially fixed with the driving worm 605 and meshing with the internal gear ring 603 is nested outside the driving worm 605. A driven worm 607 coaxially fixed with the moving rod 602 is nested outside the moving rod 602. The driven worm 607 meshes with the driving worm 605. The rotation of the sleeve provides power to drive the swing rod 604 fixed to the sleeve to rotate. The rotation of the swing rod 604 will drive the driving worm 605 and the active gear 606 fixed to the swing rod 604 to rotate. The driving worm 605 and the driven worm 607 mesh with each other. Through the cooperation of the driving worm 605 and the driven worm 607, when the swing rod 604 rotates, the driven worm 607 of the integrated structure and the moving rod 602 will move along the central line direction of the handle 5, and then drive the inner adjustable elbow 2 fixed to the moving rod 602 to move. The active gear 606 meshes with the internal gear ring 603 to limit the rotation of the driving worm 605.

[0030] As Figure 1 and Figure 4, above the support base 10, a mounting base 7 is fixed. A through hole 701 is provided in the middle position of the inner cavity of the mounting base 7. In the middle position of the inner cavity of the through hole 701, a driving shaft 8 is provided which penetrates through the mounting base 7 and is rotatably connected to the mounting base 7. A driving gear 9 coaxially fixed with the driving shaft 8 is nested outside the driving shaft 8. The driving gear 9 is located within the through hole 701 and extends out of the mounting base 7 through the through hole 701.

[0031] As Figure 1 and Figure 4 and Figure 5 and Figure 6 , the bottom end of the driving shaft 8 extends into the speed reduction groove and is rotatably connected to the support base 10. A speed reduction assembly 11 connecting the driving shaft 8 and the moving assembly 6 is provided in the speed reduction groove. The speed reduction assembly 11 includes a first reduction gear 1101, a second reduction gear 1102, a third reduction gear 1103, a first follower shaft 1104, a fourth reduction gear 1105, a fifth reduction gear 1106, a second follower shaft 1107, a sixth reduction gear 1108, a third follower shaft 1109, a first helical gear 1110 and a second helical gear 1111 which are arranged in the mounting groove and rotatably connected to the groove wall of the mounting groove. The first reduction gear 1101 is nested outside the bottom end of the driving shaft 8 and is coaxially fixed with the driving shaft 8. The second reduction gear 1102 is located beside the first reduction gear 1101 and meshes with the first reduction gear 1101. The first follower shaft 1104 penetrates through the second reduction gear 1102 and is coaxially fixed with the second reduction gear 1102. The third reduction gear 1103 is nested outside the first follower shaft 1104 and is coaxially fixed with the first follower shaft 1104. The fourth reduction gear 1105 is located beside the third reduction gear 1103 and meshes with the third reduction gear 1103. The second follower shaft 1107 penetrates through the fourth reduction gear 1105 and is coaxially fixed with the fourth reduction gear 1105. The fifth reduction gear 1106 is nested outside the follower shaft and is coaxially fixed with the follower shaft. The sixth reduction gear 1108 is located outside the fifth reduction gear 1106 and meshes with the fifth reduction gear 1106. The third follower shaft 1109 penetrates through the sixth reduction gear 1108 and is coaxially fixed with the sixth reduction gear 1108. The first helical gear 1110 is nested outside the third follower shaft 1109 and is coaxially fixed with the third follower shaft 1109. The second helical gear 1111 is rotatably connected to the adjacent ear seat 601 and is coaxially fixed with the sleeve penetrating out of the ear seat 601. The moving rod 602 penetrates through the second helical gear 1111 and is slidably connected to the second helical gear 1111.

[0032] As Figure 1 and Figure 4 and Figure 5 and Figure 6, the rotation of the drive shaft 8 provides power, which is transmitted through the first reduction gear 1101, the second reduction gear 1102, the third reduction gear 1103, the first follower shaft 1104, the fourth reduction gear 1105, the fifth reduction gear 1106, the second follower shaft 1107, the sixth reduction gear 1108, the third follower shaft 1109, the first helical gear 1110 and the second helical gear 1111 to drive the sleeve to rotate, thereby driving the moving rod 602 to move along the center line direction of the grip 5. At the same time, through the cooperation of the first reduction gear 1101, the second reduction gear 1102, the third reduction gear 1103, the first follower shaft 1104, the fourth reduction gear 1105, the fifth reduction gear 1106, the second follower shaft 1107, and the sixth reduction gear 1108, a speed reduction effect is achieved to slow down the rotation speed of the sleeve.

[0033] Such as Figure 1 And Figure 4 And 9 , on the upper surface of the mounting seat 7, a limit box 12 is fixed. A circular groove 1201 is formed in the inner cavity of the limit box 12. The top end of the drive shaft 8 penetrates into the circular groove 1201 and is rotatably connected to the limit box 12. A limit component 13 that cooperates with the drive shaft 8 to play a limiting role is provided in the circular groove 1201. By arranging the limit component 13 in the circular groove 1201, when the rotation speed of the drive shaft 8 is too fast, the drive shaft 8 is locked, further reducing the possibility that the inner liner 1, the inner bending pipe 2, the outer bending pipe 3, and the protective sleeve 4 suddenly turn due to the too fast rotation speed of the drive shaft 8.

[0034] Such as Figure 9 , a tray 1301 is rotatably connected in the circular groove 1201. The tray 1301 is nested outside the drive shaft 8 and is coaxially fixed to the drive shaft 8. Four oppositely arranged guide plates 1302 are integrally formed on the tray 1301. An arc-shaped counterweight 1303 adapted to the guide plate 1302 is movably connected between every two adjacent guide plates 1302. The outer end of the arc-shaped counterweight 1303 extends out of the tray 1301. The arc-shaped counterweight 1303 extending out of the tray 1301 is fixed to an arc-shaped rubber block. A rubber ring that cooperates with the arc-shaped rubber block is fixed to the groove wall of the circular groove 1201. When the rotation speed of the drive shaft 8 is too fast, the tray 1301 coaxially fixed to the drive shaft 8 is driven to rotate. The too fast rotation of the tray 1301 will cause the arc-shaped counterweight 1303 to extend out of the tray 1301 under the action of centrifugal force and make the arc-shaped rubber block contact the rubber ring, greatly increasing the friction force. The drive shaft 8 stops rotating under the action of the friction force, realizing the limiting function.

[0035] The present invention also provides a method for using the adjustable bending sheath tube, including the following steps: Check the integrity of the sheath, preprocess the sheath, and thoroughly flush the inner lumen of the sheath and the sheath core with heparinized saline to avoid thrombus formation. Establish a channel through puncture, puncture through the femoral artery, jugular vein, or radial artery. After inserting a guide wire, advance a dilator along the guide wire to pre-dilate the channel. Then withdraw the dilator and insert an adjustable curve sheath. Slowly push the adjustable curve sheath along the guide wire to the target vascular area, maintaining coaxiality with the guide wire to reduce friction against the vessel wall. After the tip of the sheath reaches the target position, withdraw the guide wire and continuously flush through the side arm connected to heparinized saline.

[0036] The handle is operated to bend. Combining with the intraoperative image, the medical staff manually rotate the driving gear 9. The rotation of the driving gear 9 will drive the rotation of the driving shaft 8 fixedly coaxial with the driving gear 9. The rotation of the driving shaft 8 will drive the rotation of the first reduction gear 1101 fixedly coaxial with the driving shaft 8. The rotation of the first reduction gear 1101 will drive the rotation of the second reduction gear 1102 meshing with the first reduction gear 1101. The diameter of the first reduction gear 1101 is smaller than that of the second reduction gear 1102. The rotation of the second reduction gear 1102 will drive the rotation of the first follower shaft 1104 fixedly coaxial with the second reduction gear 1102. The rotation of the first follower shaft 1104 will drive the rotation of the third reduction gear 1103 fixedly coaxial with the first follower shaft 1104. The diameter of the third reduction gear 1103 is smaller than that of the second reduction gear 1102. The rotation of the third reduction gear 1103 will drive the rotation of the fourth reduction gear 1105 meshing with the third reduction gear 1103. The diameter of the fourth reduction gear 1105 is larger than that of the third reduction gear 1103. The rotation of the fourth reduction gear 1105 will drive the rotation of the second follower shaft 1107 fixedly coaxial with the fourth reduction gear 1105. The rotation of the second follower shaft 1107 will drive the rotation of the fifth reduction gear 1106 fixedly coaxial with the second follower shaft 1107. The diameter of the fifth reduction gear 1106 is smaller than that of the fourth reduction gear 1105. The rotation of the fifth reduction gear 1106 will drive the rotation of the sixth reduction gear 1108 meshing with the fifth reduction gear 1106. The diameter of the fifth reduction gear 1106 is smaller than that of the sixth reduction gear 1108. The rotation of the sixth reduction gear 1108 will drive the rotation of the third follower shaft 1109 fixedly coaxial with the sixth reduction gear 1108. The rotation of the third follower shaft 1109 will drive the rotation of the first helical gear 1110 fixedly coaxial with the third follower shaft 1109. The rotation of the first helical gear 1110 will drive the rotation of the second helical gear 1111 meshing with the first helical gear 1110. The second helical gear 1111 is fixed to the other end of the sleeve passing through the ear seat 601. The rotation of the fixed driving gear 9 will drive the rotation of the swing rod 604. Through the cooperation of the first reduction gear 1101, the second reduction gear 1102, the third reduction gear 1103, the first follower shaft 1104, the fourth reduction gear 1105, the fifth reduction gear 1106, the second follower shaft 1107, the sixth reduction gear 1108, the third follower shaft 1109, the first helical gear 1110 and the second helical gear 1111, the fine adjustment accuracy is effectively improved. Without affecting the operation time, the possibility that the catheter suddenly turns due to excessive force during fine adjustment is reduced.

[0037] The rotation of the swing rod 604 will drive the rotation of the driving worm 605 and the driving gear 606 fixed to the swing rod 604. The driving worm 605 meshes with the driven worm 607. Through the cooperation of the driving worm 605 and the driven worm 607, when the swing rod 604 rotates, the driven worm 607 of the integrated structure and the moving rod 602 will move along the center line direction of the grip 5, thereby driving the inner bending tube 2 fixed to the moving rod 602 to move. When the inner bending tube 2 moves from the distal end towards the proximal end, the inner bending tube 2 drives the distal ends of the outer bending tube 3, the inner liner tube 1, and the protective sleeve tube 4 to bend downward. When the driving gear 9 is rotated in the reverse direction, the inner bending tube 2 moves from the proximal end towards the distal end, and the inner bending tube 2 drives the distal ends of the outer bending tube 3, the inner liner tube 1, and the protective sleeve tube 4 to return to the initial state. Continuously rotating the driving gear 9 in the reverse direction will cause the inner bending tube 2 to drive the distal ends of the outer bending tube 3, the inner liner tube 1, and the protective sleeve tube 4 to bend upward.

[0038] Meanwhile, once medical staff use excessive force, causing the driving gear 9 to rotate too fast, the rotation speed of the drive shaft 8 is the same as that of the driving gear 9, driving the tray 1301 coaxially fixed to the drive shaft 8 to rotate. The too-fast rotation of the tray 1301 will cause the arc-shaped counterweight 1303 to extend out of the tray 1301 under the action of centrifugal force and make the arc-shaped rubber block contact the rubber ring, greatly increasing the friction force. The drive shaft 8 stops rotating under the action of the friction force, realizing the limiting function, further reducing the possibility of the catheter suddenly turning due to excessive force during fine adjustment, and enabling the distal end of the sheath tube to accurately point to the aneurysm target blood vessel.

[0039] After the sheath tube is bent in place, a balloon, a stent, a puncture needle, a microcatheter, or an embolization device (such as a coil, a stent) is sent through the sheath tube, and the subsequent embolization operation is completed by using the stable channel formed by the sheath tube.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An adjustable deflectable sheath tube, characterized in that, It includes an inner lining tube (1), an inner bending tube (2), an outer bending tube (3), and a protective sleeve (4). The protective sleeve (4) is nested outside the outer bending tube (3), the outer bending tube (3) is nested outside the inner bending tube (2), and the inner bending tube (2) is nested outside the inner lining tube (1). It is characterized in that the bendable sheath tube further includes: A control mechanism, including a grip (5). A control groove is provided in the middle position of the inner cavity of the grip (5). A connection groove communicating with the control groove is provided at one end of the grip (5), and an extension groove (501) communicating with the control groove is provided at the other end. A moving component (6) for controlling the movement of the outer bending tube (3) along the central line direction of the grip (5) is fitted in the control groove; A driving mechanism, including a mounting seat (7) provided obliquely above the grip (5) and integrally structured with the grip (5). A through hole (701) is provided in the middle position of the inner cavity of the mounting seat (7). A driving shaft (8) passing through the mounting seat (7) and rotatably connected to the mounting seat (7) is provided in the middle position of the inner cavity of the through hole (701). A driving gear (9) coaxially fixed to the driving shaft (8) is nested outside the driving shaft (8). The driving gear (9) is located in the through hole (701), and the driving gear (9) extends out of the mounting seat (7) through the through hole (701); A speed reduction mechanism, including a support seat (10) integrally structured with the grip (5). A speed reduction groove communicating with the connection groove is provided in the inner cavity of the support seat (10). The bottom end of the driving shaft (8) extends into the speed reduction groove and is rotatably connected to the support seat (10). A speed reduction component (11) connecting the driving shaft (8) and the moving component (6) is provided in the speed reduction groove.

2. An adjustable bending sheath tube according to claim 1, characterized in that, The moving component (6) includes two ear seats (601) fixed to the bottom of the control groove and arranged oppositely. Circular holes are penetrated through each ear seat (601). A moving rod (602) is provided between the two ear seats (601). Both ends of the moving rod (602) penetrate through the adjacent ear seats (601) through the circular holes and are slidably connected to the ear seats (601). The proximal end of the inner bending tube (2) is fixed to the adjacent end of the moving rod (602). The inner lining tube (1) penetrates through the moving rod (602) and is slidably connected to the moving rod (602). One end of the inner lining tube (1) passing through the moving rod (602) passes through the grip (5) through the extension groove (501). An active component for cooperating with the moving rod (602) to control the movement of the moving rod (602) along the central line direction of the grip (5) is provided in the control groove.

3. An adjustable bending sheath tube according to claim 2, characterized in that, The movable component includes an internal gear ring (603) fixed to the wall of the control groove and arranged coaxially with the grip (5). A sleeve passes through each ear seat (601). The outer wall of the sleeve is rotatably connected to the inner wall of the circular hole. Both ends of the sleeve extend out of the ear seat (601). A swing rod (604) is fixed to the end of the sleeve extending out of the ear seat (601). The sleeve and the swing rod (604) are sleeved outside the moving rod (602) and are slidably connected to the moving rod (602). The ends of the two swing rods (604) away from the moving rod (602) are fixedly connected by a driving worm (605). An active gear (606) coaxially fixed with the driving worm (605) and meshing with the internal gear ring (603) is nested outside the driving worm (605). A driven worm (607) coaxially fixed with the moving rod (602) is nested outside the moving rod (602). The driven worm (607) meshes with the driving worm (605).

4. An adjustable bending sheath tube according to claim 3, wherein, The deceleration component (11) includes a first deceleration gear (1101), a second deceleration gear (1102), a third deceleration gear (1103), a first follower shaft (1104), a fourth deceleration gear (1105), a fifth deceleration gear (1106), a second follower shaft (1107), a sixth deceleration gear (1108), a third follower shaft (1109), a first helical gear (1110) and a second helical gear (1111) arranged in the installation groove and rotatably connected to the wall of the installation groove; The first deceleration gear (1101) is nested outside the bottom end of the driving shaft (8) and is coaxially fixed to the driving shaft (8). The second deceleration gear (1102) is located beside the first deceleration gear (1101) and meshes with the first deceleration gear (1101). The first follower shaft (1104) passes through the second deceleration gear (1102) and is coaxially fixed to the second deceleration gear (1102). The third deceleration gear (1103) is nested outside the first follower shaft (1104) and is coaxially fixed to the first follower shaft (1104). The fourth deceleration gear (1105) is located beside the third deceleration gear (1103) and meshes with the third deceleration gear (1103). The second follower shaft (1107) passes through the fourth deceleration gear (1105) and is coaxially fixed to the fourth deceleration gear (1105). The fifth deceleration gear (1106) is nested outside the follower shaft and is coaxially fixed to the follower shaft. The sixth deceleration gear (1108) is located outside the fifth deceleration gear (1106) and meshes with the fifth deceleration gear (1106). The third follower shaft (1109) passes through the sixth deceleration gear (1108) and is coaxially fixed to the sixth deceleration gear (1108). The first helical gear (1110) is nested outside the third follower shaft (1109) and is coaxially fixed to the third follower shaft (1109). The second helical gear (1111) is rotatably connected to the adjacent ear seat (601) and is coaxially fixed to the sleeve extending out of the ear seat (601). The moving rod (602) passes through the second helical gear (1111) and is slidably connected to the second helical gear (1111).

5. An adjustable bending sheath tube according to claim 4, wherein, A limiting box (12) is fixed on the upper surface of the mounting base (7). A circular groove (1201) is formed in the inner cavity of the limiting box (12). The top end of the driving shaft (8) penetrates into the circular groove (1201) and is rotatably connected with the limiting box (12). A limiting component (13) which cooperates with the driving shaft (8) to play a limiting role is arranged in the circular groove (1201).

6. An adjustable bending sheath tube according to claim 5, characterized in that, A tray (1301) is rotatably connected in the circular groove (1201). The tray (1301) is nested outside the driving shaft (8) and is coaxially fixed with the driving shaft (8). Four oppositely arranged guide plates (1302) are integrally formed on the tray (1301). An arc-shaped counterweight (1303) adapted to the guide plate (1302) is movably connected between every two adjacent guide plates (1302). The outer end of the arc-shaped counterweight (1303) extends out of the tray (1301). The arc-shaped counterweight (1303) extending out of the tray (1301) is fixed with an arc-shaped rubber block. A rubber ring adapted to the arc-shaped rubber block is fixed on the groove wall of the circular groove (1201).

7. An adjustable bending sheath tube according to claim 1, characterized in that, The distal end of the protective sleeve tube (4) is fixed to the distal end of the inner lining tube (1) and closes the gap between the distal ends of the protective sleeve tube (4) and the inner lining tube (1). The inner bending tube (2) and the outer bending tube (3) are located in the gap between the protective sleeve tube (4) and the inner lining tube (1). The distal ends of the inner bending tube (2) and the outer bending tube (3) are fixedly connected. The distal end of the inner bending tube (2) is connected to the outer wall of the inner lining tube (1). The proximal end of the protective sleeve tube (4) is fixed to the end of the mounting base (7). The proximal end of the outer bending tube (3) extends into the speed reduction groove and is fixed to the groove wall of the speed reduction groove. The inner lining tube (1) passes through the handle (5) through the extension groove (501).

8. An adjustable bending sheath tube according to claim 1, characterized in that, A plurality of first cut grooves (201) are uniformly formed on the outer wall of the distal end of the inner bending tube (2). The plurality of first cut grooves (201) are arranged in an array along the central line direction of the inner bending tube (2). A plurality of second cut grooves are uniformly formed on the outer wall of the distal end of the outer bending tube (3). The plurality of second cut grooves are arranged in an array along the central line direction of the outer bending tube (3). The first cut grooves (201) and the second cut grooves are alternately arranged and oppositely arranged.

9. An adjustable bending sheath tube according to claim 1, characterized in that, The inner lining tube (1) and the protective sleeve tube (4) are made of elastic materials, and the inner bending tube (2) and the outer bending tube (3) are made of rigid materials.

10. The method of using an adjustable bending sheath tube as claimed in claim 1, characterized in that, It includes the following steps: S1: Check the integrity of the sheath tube and pre-treat the sheath tube; S2: Puncture through the femoral artery, jugular vein or radial artery. After inserting a guide wire, send a dilator along the guide wire to pre-dilate the channel, and then withdraw the dilator; S3: Slowly push the adjustable bending sheath tube along the guide wire to the target blood vessel area, and keep coaxial with the guide wire to reduce the friction of the blood vessel wall; S4: Combine the intraoperative images, manually and slowly rotate the driving gear (9) to adjust the bending angle of the distal end of the sheath tube and accurately point to the target blood vessel of the aneurysm; S5: After the sheath tube is bent in place, send a balloon, stent, puncture needle, microcatheter or embolization device through the sheath tube.

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