Universal ureter guiding sheath tube
By wrapping the steel wire in the ureter guide sheath to form a spring tube and using annealed steel wire, the random bending of the guide sheath tube is achieved, which solves the problem of low surgical efficiency in the prior art and improves the stone removal rate and flexibility of surgery.
Patent Information
- Application Number
- CN202420462627.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-11
AI Technical Summary
Due to its insufficient toughness, the existing ureteral guide sheath cannot get close to the stone, resulting in low surgical efficiency and ineffective removal of larger stones, limiting the development of ureteral soft-scopic surgery.
A universal ureteral guide sheath is designed to form a spring tube by wrapping the wire in the guide sheath tube and using annealed wire in the bending section to reduce the hardness, allowing it to be bent at will, combining the materials of the inner and outer tubes. Select to achieve flexible adjustments to the head section, bending section and extension section.
The random bending of the guide sheath can be achieved, which can be closer to the stone, improve the surgical efficiency, avoid the impact of stone powder and the uncertainty of natural stone discharge, improve the stone removal rate, and solve the problem of low surgical efficiency.
Smart Images
Figure CN222172212U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a universal ureteral guide sheath tube, in particular to a guide sheath tube used for establishing an instrument channel between the urethra bladder, ureter and renal pelvis, which is applied in the ureteral guide sheath and belongs to the technical field of medical equipment. Background Art
[0002] Ureteroscopic surgery is a pure laparoscopic minimally invasive surgery in urology. It uses the body's natural urinary system cavity to insert a thin scope with a diameter of about 3mm through the urethra and bladder into the ureter, or through the ureter into the renal pelvis, so as to remove ureteral stones or renal pelvic stones. Usually, a ureteral guide sheath is used to establish a channel from the outside of the body through the urethra and ureter to the renal pelvis, and then a ureteroscope is used to enter the surgical area directly through the ureteral guide sheath. It can be convenient to perform related operations and is not affected by the curvature or thickness of the ureter or urethra. It is suitable for conservative treatment of various ureteral stones and some kidney stones. Due to the advantages of not making any incisions on the body and less trauma, ureteroscopic surgery is gradually replacing extracorporeal lithotripsy, percutaneous nephrolithotomy and other treatment methods, and has become the mainstream lithotripsy method. However, the low efficiency of the operation and the fact that it can only handle relatively small stones have affected the further development of flexible ureteroscopy. The main factor affecting the efficiency of the operation is the process of removing the stone fragments. There are currently two ways to remove the stones: using a stone basket to remove them one by one, or crushing the stones as much as possible and waiting for them to be expelled naturally. However, since removing stones one by one is too slow, and natural expulsion after crushing is prone to residual stones and recurrence, larger stones can only be treated with percutaneous nephrolithotomy, which is more traumatic.
[0003] If the ureteral guide sheath can be brought close to the stone, the efficiency of the operation can be significantly improved. Because while the laser lithotripsy is in progress, the water flow injected during the operation can flush the stone fragments out of the ureteral guide sheath, which not only avoids the situation where stone powder affects the field of vision and accumulates in the kidney, which affects the efficiency of the operation, but also avoids the uncertainty of natural stone excretion and improves the stone clearance rate. However, the main body of the ureteral guide sheath currently used is a relatively tough tube, namely the ureteral guide sheath tube, and its tube mouth is difficult to get close to the stone.
[0004] Specifically, the ureteral guide sheath mainly emphasizes the compression and torsion resistance. After being placed into the human body along the guide wire, the toughness of the ureteral guide sheath can relatively straighten the bend of the ureter, making it easier for the endoscope to enter, exit, and rotate. Also because of the toughness of the tube, the ureteral guide sheath can only be placed in the upper part of the ureter or just enter the renal pelvis, forming a channel parallel to the longitudinal axis of the body. It cannot bend into the renal pelvis or calyx, and therefore cannot approach the stones. Although some manufacturers have made the outer layer of the ureteral guide sheath into different hardnesses to enhance the bending performance, it still cannot achieve the effect of arbitrary bending.
[0005] Therefore, it is urgent to develop and design a new ureteral guide sheath to achieve the effect of arbitrary bending. Summary of the invention
[0006] In view of the above existing technical problems, the utility model provides a universal ureteral guide sheath which can be bent at will to achieve the technical purpose of completely solving the low efficiency of surgery.
[0007] To achieve the above-mentioned purpose, the utility model provides a universal ureteral guide sheath, which includes, from inside to outside, an inner tube, a spring tube formed by winding a steel wire around the outer wall of the inner tube, and an outer tube covering the outer wall of the spring tube;
[0008] From front to back, it includes a pipe head section, a curved section connected to the rear end of the pipe head section, and an extension section connected to the rear end of the curved section;
[0009] The front end of the tube head section is configured as an arc-shaped tip;
[0010] The steel wire used for the spring tube of the bending section is annealed steel wire, and its hardness is lower than that of the steel wire used for the spring tube of the tube head section and the extension section;
[0011] The bending section has a hardness less than that of the extending section and is capable of bending;
[0012] The hardness of the extension section is equal to the hardness of the tube head section.
[0013] Furthermore, in the present invention, the bending angle of the bending section is 0-280°.
[0014] Furthermore, in the utility model, the length of the universal ureteral guide sheath is 230-600 mm, the length of the tube head section is 2-15 mm, and the length of the curved section is 15-200 mm.
[0015] Furthermore, in the utility model, the inner layer tube is made of PTFE modified material.
[0016] Furthermore, in the utility model, the inner diameter of the inner layer tube is 2.9-4.8 mm.
[0017] Furthermore, in the utility model, the steel wire is made of SUS304 stainless steel.
[0018] Furthermore, the utility model adopts a flat steel wire with a thickness of 0.03-0.15 mm and a width of 0.1-0.4 mm.
[0019] Furthermore, in the utility model, the outer layer tube is made of PEBAX material.
[0020] Furthermore, in the utility model, the outer diameter of the outer layer tube is 3.0-6.0 mm.
[0021] In summary, the head of the existing ureteral guide sheath can be bent, and the head of the ureteral soft lens has a snake bone. The steel wire on the handle can be pulled to control the ureteroscope to freely turn in the renal pelvis. The utility model utilizes this characteristic of the soft lens. The curved section of the guide sheath is annealed to soften it, so that it can bend with the soft lens, thereby sending the tube head section to places that are difficult to reach with the existing sheath, and performing negative pressure suction to clear the stones, thereby achieving the purpose of clearing all the stones, and completely solving the problem of whether the stones can be cleared cleanly, which brings a lot of convenience to doctors and patients during use.
[0022] Compared with existing products, the technical advantages of this utility model are:
[0023] 1. The tube head section, bending section and extension section are all made of the same material. Only the stainless steel wire of the spring tube in the bending section is annealed steel wire, so that the hardness of the bending section is less than that of the extension section, and the effect of arbitrary bending can be achieved.
[0024] 2. Ordinary stainless steel wire is used for the steel wire of the spring tube of the tube head section and the extension section, which does not change the normal hardness of the tube head section and the extension section, not only to ensure the original strength, but also to solve the bendability.
[0025] 3. The overall structure is simple and easy to operate, making the patient experience more comfortable and suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the structure of the utility model;
[0027] Figure 2 It is a schematic diagram of the structure of the utility model when it is bent;
[0028] In the figure: 1, pipe head section, 2, bending section, 3, extension section. DETAILED DESCRIPTION
[0029] The present invention is further described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as front, back, inside, outside...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0031] like Figure 1 As shown, this embodiment provides a universal ureteral guide sheath, which is composed of a three-layer structure, including, from the inside to the outside, an inner tube, a spring tube formed by winding a steel wire around the outer wall of the inner tube, and an outer tube wrapped around the outer wall of the spring tube.
[0032] In specific implementation, the inner tube is made of PTFE modified material, which is relatively soft and will not damage the lens of the ureteroscope.
[0033] In other embodiments, the inner diameter of the inner tube is 2.9-4.8 mm.
[0034] In specific implementation, the steel wire of the spring tube is made of SUS304 stainless steel. In addition, the spring tube woven by the steel wire plays a supporting role for the overall structure.
[0035] In other embodiments, the steel wire is flat, with a thickness of 0.03-0.15 mm and a width of 0.1-0.4 mm.
[0036] In specific implementation, the outer tube is made of PEBAX material, which is an elastic nylon polymer material. The conventional sheath tube (normal hardness range 12) uses a hardness of Shore 63D, and this hardness material also has a certain degree of flexibility.
[0037] In other embodiments, the outer diameter of the outer tube is 3.0-6.0 mm.
[0038] like Figure 1 , Figure 2 As shown, the universal ureteral guide sheath provided in this embodiment is divided into three parts, including a tube head section 1, a curved section 2 connected to the rear end of the tube head section 1, and an extension section 3 connected to the rear end of the curved section 2 from front to back.
[0039] The front end of the tube head section 1 is configured as an arc-shaped tip, so as to reduce the damage to the human body after the utility model enters the human body cavity.
[0040] The steel wire used for the spring tube of the bending section 2 is annealed steel wire, and its hardness is lower than that of the steel wire used for the spring tube of the tube head section 1 and the extension section 3, so that the hardness of the bending section 2 is lower than that of the extension section 3 and can be bent.
[0041] It should be noted that in the prior art, the principle of annealing is to heat the metal to a certain temperature, such as 600-700°C, to rearrange its grain boundaries and dislocation structures, thereby eliminating internal stress and deformation, and refining the grains to improve the plasticity and toughness of the metal. Annealed steel wire generally refers to steel wire after annealing treatment, which has reduced hardness but enhanced toughness, that is, it is soft and not easy to break. Generally speaking, the ordinary steel wire used in spring tubes is mostly cold-drawn steel wire, which is different from annealed steel wire in hardness.
[0042] In specific implementation, the utility model only uses annealed steel wire for the spring tube of the bending section 2, and uses ordinary steel wire for the spring tube of the tube head section 1 and the extension section 3; the entire spring tube using ordinary steel wire can also be directly annealed at the bending section 2, so that the spring tube of the bending section 2 is annealed, while the spring tube of the tube head section 1 and the extension section 3 is not annealed, and the hardness of the original steel wire material is maintained. In this way, the hardness of the spring tube at the bending section 2 can be reduced, the plasticity and toughness of the bending section 2 can be improved, and the effect of arbitrary bending can be achieved, which completely solves the problem of low surgical efficiency.
[0043] The hardness of the extension section 3 is equal to the hardness of the tube head section 1, and both are normal hardnesses of the three-layer structure of the utility model.
[0044] In specific implementation, the bending angle of the bending section 2 is 0-280°, which is basically consistent with the bending angle of the soft lens, and the operating feel of the soft lens is not greatly changed, and the damage to the snake bone and wire rope of the soft lens is minimized.
[0045] In other embodiments, the length of the universal ureteral guide sheath is 230-600 mm, the length of the tube head section 1 is 2-15 mm, and the length of the bending section 2 is 15-200 mm, thereby determining the position where the spring tube needs to be annealed and the position where the utility model can achieve bending.
[0046] From the above, it can be seen that the tube head section 1, the bending section 2 and the extension section 3 of the utility model are all made of the same material. Only the spring tube of the bending section 2 is annealed to soften the spring tube of the bending section 2, thereby reducing the hardness of the bending section 2. The spring tube of the tube head section 1 and the extension section 3 is not subjected to any treatment, and the normal hardness of the tube head section 1 and the extension section 3 is not changed. Not only can the original strength be guaranteed, but also the bendability is solved.
[0047] Furthermore, the preparation method of the universal ureteral guide sheath of the utility model comprises the following steps:
[0048] S1. Extruding the inner tube using PTFE modified material.
[0049] S2. Use a spring winding machine to wind the stainless steel wire into a spring tube; according to the required lengths of the tube head section 1 and the bending section 2, first determine the starting and ending positions of the spring tube that need to be annealed, then anneal the portion of the spring tube between the starting and ending positions to obtain annealed steel wire, and then put the spring tube on the inner layer tube.
[0050] Alternatively, a spring winding machine is first used to wind the stainless steel wire into a spring tube for the tube head section 1 and the spring tube for the extension section 3, and a spring winding machine is used to wind the annealed steel wire made of stainless steel into a spring tube for the bending section 2, and then the three are spliced together to form a complete spring tube, and finally the spring tube is put on the inner layer tube.
[0051] S3. Use PEBAX material to extrude an outer tube, and then put the outer tube on the spring tube.
[0052] S4. Insert the stainless steel core rod into the inner tube, and put the heat shrink tube on the outer tube. After baking and cooling, take out the stainless steel core rod and the heat shrink tube, and the inner tube, spring tube and outer tube are fused into a composite tube.
[0053] S5. According to the required length, the excess tubes at both ends of the composite tube are cut off, and the front end of the tube head section 1 of the composite tube is made into an arc-shaped tip, thereby obtaining a universal ureteral guide sheath.
[0054] In addition, the utility model is mainly used in ureteral guide sheaths. The bending section 2 can be bent 280° with the endoscope in the renal pelvis. The renal pelvis soft endoscope snake tube is arranged in the utility model with a passively adjustable head. The head of the soft endoscope is flush with the front end of the tube head section 1. Then, using the active bending function of the soft endoscope, the utility model is bent to the area where the stones are to be cleared and aimed at the stones. The stones can be broken while negative pressure is turned on to clean the broken stones until the stones are completely cleared.
[0055] In summary, the utility model can be widely used in surgery for diseases such as kidney stones, ureteral stones, bladder stones, etc. In addition, the utility model is easy to install, easy to use, highly versatile, and highly comfortable, and brings a lot of convenience to patients during use.
[0056] Although the principle of the present invention is described in detail above in conjunction with the preferred embodiments, those skilled in the art should understand that the above embodiments are only explanations of the exemplary implementation of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple replacements based on the technical solution of the present invention fall within the scope of protection of the present invention.
Claims
1. A universal ureteral guide sheath, comprising, from inside to outside, an inner tube, a spring tube formed by winding a steel wire around the outer wall of the inner tube, and an outer tube covering the outer wall of the spring tube; It is characterized in that From front to back, it includes a pipe head section, a curved section connected to the rear end of the pipe head section, and an extension section connected to the rear end of the curved section; The front end of the tube head section is configured as an arc-shaped tip; The steel wire used for the spring tube of the bending section is annealed steel wire, and its hardness is lower than that of the steel wire used for the spring tube of the tube head section and the extension section; The bending section has a hardness less than that of the extending section and is capable of bending; The hardness of the extension section is equal to the hardness of the tube head section.
2. The universal ureteral guide sheath according to claim 1, characterized in that: The bending angle of the bending section is 0-280°.
3. A universal ureteral guide sheath according to claim 1 or 2, characterized in that: The length of the universal ureteral guide sheath is 230-600 mm, the length of the tube head section is 2-15 mm, and the length of the curved section is 15-200 mm.
4. The universal ureteral guide sheath according to claim 1, characterized in that: The inner layer tube is made of PTFE modified material.
5. The universal ureteral guide sheath according to claim 4, characterized in that: The inner diameter of the inner tube is 2.9-4.8 mm.
6. The universal ureteral guide sheath according to claim 1, characterized in that: The steel wire is made of SUS304 stainless steel.
7. A universal ureteral guide sheath according to claim 1 or 6, characterized in that: The steel wire is flat, with a thickness of 0.03-0.15 mm and a width of 0.1-0.4 mm.
8. The universal ureteral guide sheath according to claim 1, characterized in that: The outer tube is made of PEBAX material.
9. The universal ureteral guide sheath according to claim 8, characterized in that: The outer diameter of the outer tube is 3.0-6.0 mm.