Super-lubrication ureter guiding sheath based on nickel-titanium bending-adjustable multi-layer structure

Abstract

The super-lubrication ureter guiding sheath comprises a sheath tube body and an inner core, the inner core is located on the inner side of the sheath tube body, the sheath tube body comprises a tube body straight section and a flexible bendable section, the tube body straight section is located at one end of the sheath tube body, the flexible bendable section is located at the other end of the sheath tube body, and the flexible bendable section is located at the other end of the sheath tube body. The flexible bendable section is located at the front end of the straight body section of the catheter body, a sheath catheter connector is arranged at the front end of the flexible bendable section, and the flexible bendable section comprises a bendable sheath outer catheter layer, a reinforcing dense net layer and a bendable sheath lining layer. Through improvement on a multi-layer structure and a coating material, the guide sheath has a shape memory function, the shape can be automatically or manually adjusted at different temperatures and pressures to adapt to bent and narrow parts of the ureter, the guide sheath is provided with a fine adjustment mechanism, a doctor is allowed to carry out fine shape adjustment, the fitting degree of the guide sheath and the inner wall of the ureter is optimized, and the guide sheath has a good application prospect. Meanwhile, the surgical risk is reduced, and the recovery time of a patient is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a super-lubricating ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure. Background Technique

[0002] A ureteral guiding sheath is an introducer commonly used in laparoscopic surgeries and is also one of the essential instruments for ureteroscopy examinations and treatments. The ureteral guiding sheath consists of two parts, a catheter and a catheter outer shell, and is used to guide a catheter or a lens from the urethra or a T-tube into the ureter. Reasonable and correct use of the ureteral guiding sheath can reduce the pain and trauma of patients, improve the success rate of surgeries and the cure rate of patients, and is an essential medical device. However, the existing ureteral guiding sheaths have relatively high rigidity, low softness, and a high risk of surgical injury, resulting in a long recovery time for patients in the later stage. Therefore, we propose a super-lubricating ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure. Content of the Utility Model

[0003] The purpose of the utility model is to provide a super-lubricating ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure. Through improvements in the multi-layer structure and coating materials, the guiding sheath has a shape memory function and can automatically or manually adjust its shape under different temperatures and pressures to adapt to the curved and narrow parts of the ureter. The guiding sheath is designed with a fine-tuning mechanism that allows doctors to make fine shape adjustments to optimize the fit between the guiding sheath and the inner wall of the ureter, while reducing the surgical risk and shortening the patient's recovery time.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A super-lubricating ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure, comprising a sheath body and an inner core. The inner core is located inside the sheath body. The sheath body includes a straight tube section and a flexible bendable section. The straight tube section is at one end of the sheath body, and the flexible bendable section is at the front end of the straight tube section. A sheath joint is provided at the front end of the flexible bendable section. The flexible bendable section includes a bendable outer sheath layer, a reinforcement mesh layer, and a bendable inner sheath layer. The bendable outer sheath layer is on the surface of the flexible bendable section, the bendable inner sheath layer is on the inner surface, and the reinforcement mesh layer is between the bendable outer sheath layer and the bendable inner sheath layer. A negative pressure drainage interface tube and a negative pressure control interface tube are respectively provided at the top and bottom of the surface of the straight tube section. A tube sleeve is fixedly sleeved on the surface of the straight tube section. Side wall connection rings are fixedly connected to both the top and bottom of the tube sleeve. A fixed tube is provided at the rear end of the tube sleeve. A fixed block is provided on the surface of the fixed tube. A fastening knob is threadedly sleeved at the end of the inner core. An expander joint is provided on the surface of the fastening knob. It further includes a clamping assembly. The clamping assembly includes a through hole. The through hole is opened on the middle surface of the side wall connection ring. A movable rod is provided inside the through hole. An arc-shaped plate is provided at the bottom end of the movable rod. An arc-shaped rubber pad is provided at the bottom end of the arc-shaped plate. A pull ring is provided at the top end of the movable rod. A spring is further provided between the pull ring and the side wall connection ring. The spring is simultaneously outside the surface of the movable rod.

[0006] Preferably, a wire rope traction device is provided at the connection between the sheath joint and the flexible bendable section.

[0007] Preferably, a biocompatible lubricating coating is applied on the surface of the flexible bendable section.

[0008] Preferably, the bendable inner sheath layer is made of a soft medical polymer material.

[0009] Preferably, the flexible bendable section is made of a special nickel-titanium alloy material.

[0010] Preferably, the reinforcement mesh layer is made of an alloy with a shape memory effect.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. Through improvements in the multi-layer structure and coating materials, the guiding sheath has a shape memory function and can automatically or manually adjust its shape under different temperatures and pressures to adapt to the curved and narrow parts of the ureter. The guiding sheath is designed with a fine-tuning mechanism, allowing doctors to perform fine shape adjustments to optimize the fit between the guiding sheath and the inner wall of the ureter, while reducing the surgical risk and shortening the patient's recovery time.

[0013] 2. By designing a clamping component, when a doctor uses the guiding sheath, the pull ring can be first pulled upward. The pull ring drives the movable rod to move. At this time, the spring is stressed and contracts. The movable rod drives the arc-shaped plate and the arc-shaped rubber pad to move upward. Then the doctor inserts the finger into the inner side of the side wall connecting ring, and then releases the pull ring. At this time, the spring contracts without force, so that the arc-shaped rubber pad clamps the doctor's finger, enabling the doctor's finger to be stably fixed to the inner side of the side wall connecting ring, ensuring that the doctor is more stable when using the guiding sheath. Description of the Drawings

[0014] Figure 1 Schematic structural diagram of an embodiment of the present invention;

[0015] Figure 2 Schematic structural diagram of the flexible bendable section of the present invention;

[0016] Figure 3 For the present invention Figure 1 Schematic structural diagram of the position A in;

[0017] Wherein: 1. Sheath tube body; 2. Straight section of the tube body; 3. Flexible bendable section; 4. Sheath tube joint; 5. Bendable sheath outer tube layer; 6. Reinforcing mesh layer; 7. Bendable sheath inner lining layer; 8. Negative pressure drainage interface tube; 9. Negative pressure control interface tube; 10. Tube sleeve; 11. Fixed tube; 12. Fixed block; 13. Tightening knob; 14. Dilator joint; 15. Side wall connecting ring; 16. Inner core; 17. Through hole; 18. Movable rod; 19. Arc-shaped plate; 20. Arc-shaped rubber pad; 21. Pull ring; 22. Spring. Detailed Description of the Embodiment

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] Embodiment 1:

[0020] Please refer to Figure 1 , Figure 2, a super-lubricious ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure, includes a sheath body 1 and an inner core 16. The inner core 16 is located inside the sheath body 1. The sheath body 1 includes a straight tube section 2 and a flexible bendable section 3. The straight tube section 2 is at one end of the sheath body 1, and the flexible bendable section 3 is at the front end of the straight tube section 2. A sheath connector 4 is provided at the front end of the flexible bendable section 3. The flexible bendable section 3 includes a bendable outer sheath layer 5, a reinforcing mesh layer 6, and a bendable inner sheath layer 7. The bendable outer sheath layer 5 is on the surface of the flexible bendable section 3, the bendable inner sheath layer 7 is on the inner surface, and the reinforcing mesh layer 6 is between the bendable outer sheath layer 5 and the bendable inner sheath layer 7. At the top and bottom of the surface of the straight tube section 2, a negative pressure drainage interface tube 8 and a negative pressure control interface tube 9 are respectively provided. A tube sleeve 10 is also fixedly sleeved on the surface of the straight tube section 2. Side wall connection rings 15 are fixedly connected to the top and bottom of the tube sleeve 10. A fixing tube 11 is provided at the rear end of the tube sleeve 10. A fixing block 12 is provided on the surface of the fixing tube 11. And a fastening knob 13 is threadedly sleeved at the end of the inner core 16. An expander connector 14 is provided on the surface of the fastening knob 13. A wire rope traction device is provided at the connection between the sheath connector 4 and the flexible bendable section 3, and is connected to the flexible bendable section 3 through a wire rope to achieve the bending control of the front end. A biocompatible lubricating coating is applied on the surface of the flexible bendable section 3 to reduce the risk of friction and damage, improve the interaction between the sheath and human tissues, reduce adhesions and damage, and contribute to the smooth progress of the operation. Among them, the biocompatible lubricating coating is a combination of one or two or more of polyvinylpyrrolidone, polyacrylamide, polyethylene glycol, polyvinyl alcohol, chitosan, polyamideimide / polytetrafluoroethylene composite coating, etc. The bendable inner sheath layer 7 is made of a soft medical polymer material to provide flexibility and protect the inner wall of the ureter. Among them, the soft medical polymer material is a combination of one or two or more of polyvinyl chloride, polyethylene, polypropylene, nylon, polyurethane, polycarbonate, polymethyl methacrylate, etc. The flexible bendable section 3 is made of a special nickel-titanium alloy material, and its bendable function is realized by using its shape memory effect and superelastic polymer layer. The application of the nickel-titanium alloy enables the front end of the sheath to automatically adjust its shape according to the body temperature change, and better adapt to the curved part of the ureter. The reinforcing mesh layer 6 is made of an alloy with a shape memory effect to enhance the post-bending reset ability of the sheath body 1. Among them, the shape memory alloy is a combination of one or two or more of nickel-titanium alloy, copper-based shape memory alloy, iron-based shape memory alloy, titanium-nickel-copper, titanium-nickel-iron, titanium-nickel-chromium alloy, etc.; through the improvement of the multi-layer structure and coating materials, the guiding sheath has a shape memory function, can automatically or manually adjust its shape under different temperatures and pressures to adapt to the curved and narrow parts of the ureter. The guiding sheath is designed with a fine-tuning mechanism, allowing the doctor to perform fine shape adjustments to optimize the fit between the guiding sheath and the inner wall of the ureter, while reducing the surgical risk and shortening the patient's recovery time.

[0021] In this embodiment, preferably, as shown in Figure 1 , Figure 3 , it further includes a clamping assembly. The clamping assembly includes a through hole 17 opened on the middle surface of the side wall connecting ring 15. An active rod 18 is arranged inside the through hole 17. An arc-shaped plate 19 is arranged at the bottom end of the active rod 18. An arc-shaped rubber pad 20 is arranged at the bottom end of the arc-shaped plate 19. A pull ring 21 is arranged at the top end of the active rod 18. A spring 22 is further arranged between the pull ring 21 and the side wall connecting ring 15. The spring 22 is simultaneously located outside the surface of the active rod 18. By designing the clamping assembly, when a doctor uses the guiding sheath, the pull ring 21 can be pulled upward first. The pull ring 21 drives the active rod 18 to move. At this time, the spring 22 is stressed and contracts. The active rod 18 drives the arc-shaped plate 19 and the arc-shaped rubber pad 20 to move upward. Then the doctor inserts a finger into the inside of the side wall connecting ring 15 and then releases the pull ring 21. At this time, the spring 22 is not stressed and contracts, so that the arc-shaped rubber pad 20 clamps the doctor's finger, enabling the doctor's finger to be firmly fixed inside the side wall connecting ring 15, ensuring that the doctor is more stable when using the guiding sheath.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A superlubricious ureteral guiding sheath based on a nickel-titanium adjustable bending multi-layer structure, comprising a sheath body (1) and an inner core (16), the inner core (16) being inside the sheath body (1), and characterized in that: The sheath tube body (1) includes a straight tube section (2) and a flexible bendable section (3). The straight tube section (2) is at one end of the sheath tube body (1), and the flexible bendable section (3) is at the front end of the straight tube section (2). A sheath tube joint (4) is provided at the front end of the flexible bendable section (3). The flexible bendable section (3) includes a bendable outer sheath layer (5), a reinforcing mesh layer (6), and a bendable inner sheath layer (7). The bendable outer sheath layer (5) is on the surface of the flexible bendable section (3), the bendable inner sheath layer (7) is on the inner surface, and the reinforcing mesh layer (6) is between the bendable outer sheath layer (5) and the bendable inner sheath layer (7). At the top and bottom of the surface of the straight tube section (2), a negative pressure drainage interface tube (8) and a negative pressure control interface tube (9) are respectively provided. A tube sleeve (10) is fixedly sleeved on the surface of the straight tube section (2). Side wall connection rings (15) are fixedly connected to the top and bottom of the tube sleeve (10). A fixing tube (11) is provided at the rear end of the tube sleeve (10). A fixing block (12) is provided on the surface of the fixing tube (11). A fastening knob (13) is threadedly sleeved at the end of the inner core (16), and an expander joint (14) is provided on the surface of the fastening knob (13); it further includes a clamping assembly. The clamping assembly includes a through hole (17) opened on the middle surface of the side wall connection ring (15). An active rod (18) is provided inside the through hole (17). An arc-shaped plate (19) is provided at the bottom end of the active rod (18). An arc-shaped rubber pad (20) is provided at the bottom end of the arc-shaped plate (19). A pull ring (21) is provided at the top end of the active rod (18). A spring (22) is further provided between the pull ring (21) and the side wall connection ring (15), and the spring (22) is simultaneously outside the surface of the active rod (18).

2. The super-lubricious ureteral guiding sheath based on a nickel-titanium adjustable bending multi-layer structure according to claim 1, wherein: A wire rope traction device is provided at the connection between the sheath tube joint (4) and the flexible bendable section (3).

3. The super-lubricating ureteral guiding sheath based on a nickel-titanium adjustable multi-layer structure according to claim 1, characterized in that: The surface of the flexible bendable section (3) is coated with a biocompatible lubricating coating.

4. The superlubricious ureteral guiding sheath based on a nickel-titanium adjustable bending multi-layer structure according to claim 1, wherein: The bendable inner sheath layer (7) is made of a soft medical polymer material.

5. A super-lubricious ureteral guiding sheath based on a nickel-titanium adjustable bending multi-layer structure according to claim 1, characterized in that: The flexible bendable section (3) is made of a special nickel-titanium alloy material.

6. The superlubricious ureteral guiding sheath based on a nickel-titanium adjustable bending multi-layer structure according to claim 1, wherein: The reinforcing mesh layer (6) is made of an alloy with a shape memory effect.

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