Stent system for treating urinary tract stenosis of prostate and operation method

Abstract

The invention discloses a stent system for treating urinary tract stenosis of prostate and an operation method, the stent system comprises a main body, a bridge tube, a urethroscope body, a stent assembly and an obturator, one end of the main body is provided with a sheathing canal, one end of the sheathing canal is fixedly connected with the main body, the other end of the main body is provided with assembly ports respectively matched with the bridge tube and the obturator, and the bridge tube is fixedly connected with the stent assembly. The assembly opening is communicated with the interior of the sheath tube, the bridge tube and the obturator are both detachably connected with the assembly opening, the urethroscope body is matched with the interior of the bridge tube and detachably connected with the bridge tube, an insertion opening matched with the support assembly is formed in the outer side of the bridge tube, one end of the urethroscope body is located outside the bridge tube, and the other end of the urethroscope body is located outside the insertion opening. The other end of the urethroscope body penetrates through the bridge tube and then is located in the sheath tube, one end of the support assembly penetrates through the inserting opening and then is located on the side face of the bridge tube, and the other end of the support assembly penetrates through the sheath tube and then is located outside the other end of the sheath tube. The invention has the beneficial effects that the sheathing canal only needs to be inserted and pulled once, and the purpose of small damage to human bodies is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to a stent system for treating prostatic urinary tract stenosis, and in particular to a stent system and an operation method for treating prostatic urinary tract stenosis. Background Art

[0002] Prostatic hyperplasia is a common disease in elderly men. It is a progressive disease that can cause urethral stenosis, urinary difficulty, and even complete occlusion. With the aging of the population, the incidence rate is increasing year by year. According to domestic statistics, about 35% to 50% of men over 50 years old have varying degrees of prostatic hyperplasia. At present, transurethral transurethral resection of the prostate is mainly used for prostatic hyperplasia. Because of its non-invasive and fast recovery characteristics, the proportion of prostatic hyperplasia treatment in developed countries is 60% to 90%, and it is the main treatment method. However, this method is still a traumatic surgery, which is highly affected by the proficiency of the surgeon and the physical condition of the patient. In addition, this method has a long learning curve and is expensive.

[0003] Urethral stent (or prostate stent) implantation has been greatly developed in my country in recent years. The commonly used method in clinical practice is to place a urethral stent at the urethral stricture to open the urethral stricture or obstruction. This stent is made of stainless steel, synthetic fiber silicone or nickel-titanium alloy, and can be placed in the urethral stricture through a urethroscope to expand the originally narrow and closed posterior urethra. Most patients with dysuria can restore urination function after the placement of the urethral stent.

[0004] In the prior art, in actual operation, after the obturator is inserted into the sheath, the obturator is inserted into the human body. When one end of the sheath is sent to the corresponding position of the human body, the obturator is pulled out, and then the stent assembly after the stent guide tube, traction tube and stent are assembled is inserted into the sheath. After the stent is sent into the human body, the sheath and the stent guide tube are pulled out together, and the obturator is inserted into the sheath again and inserted into the human body through the obturator, so that the urethroscope can be inserted into the sheath to observe the position of the stent and make appropriate adjustments to the position of the stent. In the above process, the sheath needs to be inserted and pulled out twice to insert the stent and the urethroscope respectively. Such operation not only has the problem of easily causing greater damage to the human body, but also is cumbersome to operate, which is not conducive to shortening the operation time. Summary of the invention

[0005] The present invention aims to overcome the disadvantage of the prior art that multiple insertion and removal of the sheath tube easily causes serious damage to the human body, and provides a stent system and an operation method for treating prostate urinary tract stenosis with little damage to the human body.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A stent system for treating prostate urinary tract stenosis comprises a main body, a bridge tube, a urethroscope main body, a stent assembly and an obturator, wherein a sheath tube is provided at one end of the main body, and one end of the sheath tube is fixedly connected to the main body, and an assembly port is provided at the other end of the main body respectively matching the bridge tube and the obturator, and the assembly port is communicated with the inside of the sheath tube, and the bridge tube and the obturator are both detachably connected to the assembly port, the urethroscope main body matches the inside of the bridge tube and is detachably connected to the bridge tube, a socket matching the stent assembly is provided on the outside of the bridge tube, one end of the urethroscope main body is located outside the bridge tube, and the other end of the urethroscope main body is located inside the sheath tube after passing through the bridge tube, one end of the stent assembly is located on the side of the bridge tube after passing through the socket, and the other end of the stent assembly is located outside the other end of the sheath tube after passing through the sheath tube.

[0007] The invention comprises a main body, a bridge tube, a urethroscope body, a bracket assembly and an obturator, wherein a sheath tube is provided at one end of the main body, and one end of the sheath tube is fixedly connected to the main body, and an assembly port which matches the bridge tube and the obturator respectively is provided at the other end of the main body, and the assembly port is communicated with the inside of the sheath tube, and the bridge tube and the obturator are both detachably connected to the assembly port, the urethroscope body matches the inside of the bridge tube and is detachably connected to the bridge tube, a socket which matches the bracket assembly is provided on the outside of the bridge tube, one end of the urethroscope body is located outside the bridge tube, and the other end of the urethroscope body is located inside the sheath tube after passing through the bridge tube, one end of the bracket assembly is located on the side of the bridge tube after passing through the socket, and the other end of the bracket assembly is located outside the other end of the sheath tube after passing through the sheath tube. During operation, the obturator is first inserted into the sheath tube, and then inserted into the human body through the obturator. When one end of the sheath tube is sent to the corresponding position of the human body, the obturator is pulled out; the bracket assembly is prepared, and the bracket assembly is inserted into the sheath tube so that the corresponding part of the bracket assembly is sent into the human body; then the bridge tube is installed, and after the bridge tube is matched with the assembly port, the bracket assembly is inserted into the socket to be limited. At the same time, the urethroscope body is matched with the bridge tube, so that the urethroscope body is inserted into the sheath tube to observe the partial position of the bracket assembly in the human body, and the position of the bracket assembly can be adjusted at the same time; in the present invention, the sheath tube can accommodate the urethroscope body and the bracket assembly at the same time, and only needs to be inserted and pulled out once, thereby achieving the purpose of less damage to the human body and convenient operation.

[0008] Preferably, one end of the assembly port is close to the sheath tube, and the other end of the assembly port is far from the sheath tube. The caliber of the assembly port close to the sheath tube end is smaller than the caliber of the assembly port far from the sheath tube end. The side wall of the assembly port close to the sheath tube end is inclined and its caliber gradually increases toward the other end of the assembly port. A step surface 1 is provided on the side wall of the assembly port. The side wall of the assembly port close to the sheath tube end is connected with the side wall of the other end of the assembly port through the step surface 1. The bridge tube is interference fit with the end of the assembly port close to the sheath tube. It is convenient to install and disassemble the bridge tube, easy to operate, and simple in structure. At the same time, the structural design of the assembly port facilitates the smooth insertion of the bridge tube.

[0009] Preferably, the bridge tube includes a tube body that matches the urethroscope body, one end of the tube body is provided with a mounting seat, the mounting seat is sleeved outside the tube body and fixedly connected to the tube body, the other end of the urethroscope body is located in the sheath after passing through the tube body and the main body in sequence through the mounting seat, the mounting seat is provided with a locking mechanism that matches the urethroscope body, the urethroscope body is sealed and detachably connected to the tube body through the mounting seat and is locked and fixed by the locking mechanism, the other end of the tube body is sleeved with a positioning plug 1, the positioning plug 1 is fixedly connected to the tube body, the tube body is positioned in the assembly port after the positioning plug 1 has an interference fit with one end of the assembly port close to the sheath, the socket is located on the positioning plug 1 and on the side of the tube body. When installing the bridge tube, insert the positioning plug 1 into the assembly port so that the positioning plug 1 has an interference fit with one end of the assembly port close to the sheath, the installation and disassembly is convenient and quick, and the structure is simple.

[0010] Preferably, the positioning plug 1 is provided with a step surface 2 matching the step surface 1, the end of the assembly port away from the sheath tube is provided with a plurality of slots, and the side wall of the positioning plug 1 is protruding and fixed with a plurality of convex shafts matching the slots one by one. When installing the bridge tube, the positioning plug 1 is inserted into the assembly port so that the positioning plug 1 and the end of the assembly port close to the sheath tube are interference fit, the step surface 2 is limited to the step surface 1, and the convex shaft is stuck in the corresponding slot to prevent radial deflection, so as to improve the positioning effect of the bridge tube.

[0011] Preferably, the urethroscope body is provided with a handle 1, one end of which is an eyepiece end, and the other end of which is respectively connected to a sheath and a locking shaft matching the locking mechanism, the sheath passes through the tube body and the main body in sequence and is located in the sheath tube, the locking shaft is located on the side of the sheath, and the locking shaft is fixedly connected to the handle 1. The urethroscope body matches the locking mechanism through the locking shaft, so that the urethroscope body can be locked and fixed after being inserted into place through the tube body.

[0012] The locking mechanism comprises a locking pin which is perpendicular to the locking shaft, the mounting seat is provided with a matching groove which matches the locking pin, one end of the locking pin is located in the matching groove and is elastically connected to the bottom of the matching groove, and the other end of the locking pin is located outside the matching groove after passing through the opening end of the matching groove, and the bottom side of the locking pin is provided with a U-shaped groove which passes through the front and rear, and a locking tongue is fixed on one side of the U-shaped groove, and a locking area is formed between the other side of the U-shaped groove and the locking tongue for easy penetration of the locking shaft. The mounting seat is provided with a through hole which matches the locking shaft, and the through hole is connected with the matching groove and corresponds to the locking area. One end of the locking shaft is fixedly connected to the handle, and the other end of the locking shaft is provided with a conical guide head, and the locking shaft is provided with a V-shaped locking groove which matches the locking tongue, and the top side of the locking pin is provided with a rectangular groove, and the length direction of the rectangular groove is parallel to the depth direction of the matching groove, and a limiting bolt which matches the rectangular groove is threadedly connected to the mounting seat. When assembling the urethroscope body, the scope sheath is inserted into the sheath tube through the tube body on the bridge tube. During this process, the lock shaft is gradually inserted into the locking area through the guide head to overcome the elastic effect, and the lock pin moves to the bottom of the matching groove until the lock tongue is stuck in the V-shaped lock groove, so that the urethroscope body and the bridge tube are locked when assembled; conversely, when the urethroscope body needs to be disassembled, the operator only needs to press the end of the lock pin outside the matching groove inward to make the lock tongue disengage from the V-shaped lock groove, and then pull out the urethroscope body, which is simple to operate; the inclined surfaces on both sides of the V-shaped lock groove facilitate the smooth introduction of the lock tongue; the rectangular groove facilitates the movement direction of the lock pin to prevent it from deflecting, thereby facilitating the lock shaft to be smoothly inserted into the locking area.

[0013] Preferably, the obturator comprises a handle 2 and an insertion shaft matching the inside of the sheath tube, a positioning plug 2 is provided at one end of the insertion shaft, the insertion shaft is fixedly connected to the handle 2 through the positioning plug 2, the insertion shaft is positioned in the assembly port after the positioning plug 2 has an interference fit with the end of the assembly port close to the sheath tube, the handle 2 is located outside one end of the sheath tube, the other end of the insertion shaft closes the other end of the sheath tube and is provided with an arc-shaped head, the head is located outside the other end of the sheath tube. When installing the obturator, the positioning plug 2 is inserted into the assembly port so that the positioning plug 2 has an interference fit with the end of the assembly port close to the sheath tube, the installation and disassembly is convenient and quick, and the structure is simple; because the head of the sheath tube is relatively sharp, direct insertion into the human body will cause damage to the human body, so it is necessary to insert the obturator into the human body through the arc-shaped head to reduce damage to the human body.

[0014] Preferably, the second positioning plug is provided with a step surface 2 matching the first step surface, the end of the assembly port away from the sheath is provided with a plurality of slots, and the side wall of the second positioning plug is protrudingly fixed with a plurality of convex shafts matching the slots one by one. When installing the obturator, the second positioning plug is inserted into the assembly port so that the second positioning plug is interference fit with the end of the assembly port close to the sheath, the second step surface is limited to the first step surface, and the convex shaft is stuck in the corresponding slot to prevent radial deflection, so as to improve the positioning effect of the obturator.

[0015] Preferably, the bracket assembly comprises a bracket body, a connecting tube, three elastic stop pressure rods, a bracket guide tube and a traction tube matching the socket, the bracket body is a hollow three-dimensional structure formed by several elastic closed wires, the three elastic stop pressure rods are distributed along the circumference of the connecting tube and are respectively located at corresponding hollow positions of the bracket body, one end of the bracket body is retracted inwardly and fixed in one end of the connecting tube at the same time as the end of the elastic stop pressure rod, the other end of the bracket body is opened outward in an arc shape, two of the elastic stop pressure rods are linearly and gradually inclined outward, and the other elastic stop pressure rod is linearly and gradually inclined outward. The dynamic pressure rod is formed into a leaf shape after opening outward in an arc shape. A traction line is fixed to the other end of the connecting tube and a slot matching the traction tube is provided on its end face. One end of the traction line is located in the traction tube and the other end of the traction line is located outside the traction tube. The connecting tube is slidably connected to the inside of the bracket guide tube. The bracket body and the elastic stop pressure rod can be retracted into the bracket guide tube. One end of the traction tube matches the slot and is located in one end of the bracket guide tube. The other end of the traction tube passes through the other end of the bracket guide tube and is located outside the bracket guide tube. The traction tube is slidably connected to the bracket guide tube. After the stent body is expanded and popped open, it is positioned against the prostate opening by a leaf-shaped elastic stop pressure rod, which is used to prevent the stent from migrating back into the bladder; at the same time, two elastic stop pressure rods that are linearly and gradually inclined outwards open the two side walls of the prostate, further expanding the internal channel of the prostate, making urination smoother during the period when the stent is retained in the body; in the initial state, the stent body and the elastic stop pressure rod are both contracted in the stent guide tube, the traction tube is inserted into the sheath tube through the stent guide tube, and the stent body is pushed into the bladder so that the stent body and the elastic stop pressure rod are both popped open; the stent guide tube is pulled out, the urethroscope body is inserted to observe the position of the stent body in the human body, and then the traction tube is rotated to put the stent body in an ideal position; the traction tube is slowly pulled outward to make the stent body retreat to the prostate until the elastic stop pressure rod located in the stop zone three just rests against the prostate opening.

[0016] Preferably, the bracket body includes a proximal support rod, a middle support rod and a distal support rod, and the number of the proximal support rod, the middle support rod and the distal support rod are three each, one end of the proximal support rod is fixed in one end of the connecting tube, the other end of the proximal support rod is fixedly connected to one end of the corresponding middle support rod to form a whole, the middle support rod and the connecting tube are parallel to each other, the proximal support rod is inclined and the angle formed with the middle support rod is an obtuse angle, the other end of each adjacent two middle support rods are fixedly connected to form a whole through the corresponding distal support rod, the distal support rod is V-shaped and opens outward in an arc shape from its two ends to the middle, and the middle of the distal support rod forms a V-shaped protrusion after a smooth transition through the arc structure. The structural design of the stent body can be compressed or expanded. The stent body in the compressed state is convenient for insertion into or removal from the human body, and the stent body in the popped-out state is convenient for applying radial pressure to the inner wall tissue of the prostate, thereby producing a longitudinal incision to relieve urethral constriction and increase the urinary tract. As time goes by, the force exerted by the stent body weakens the blood supply of the tissue in contact with the wire, thereby inducing tissue necrosis and generating infarcted incisions. The V-shaped protrusion is more conducive to the contraction of the stent body and the diameter after contraction is smaller, reducing the patient's pain when inserting or removing it from the human body.

[0017] Preferably, three proximal support rods are respectively distributed at the positions of 5 o'clock, 7 o'clock and 12 o'clock, and a stop zone 1 is formed between the proximal support rod corresponding to the 5 o'clock position and the proximal support rod corresponding to the 12 o'clock position, a stop zone 2 is formed between the proximal support rod corresponding to the 7 o'clock position and the proximal support rod corresponding to the 12 o'clock position, and a stop zone 3 is formed between the proximal support rod corresponding to the 5 o'clock position and the proximal support rod corresponding to the 7 o'clock position, wherein two elastic stop pressure rods which are linearly gradually inclined outwards are respectively located in the stop zone 1 and the stop zone 2 and their lengths are both smaller than the other leaf-shaped elastic stop pressure rod, and the other elastic stop pressure rod which is arc-shaped and opens outwards to form a leaf shape is located in the stop zone 3. The two elastic stop pressure rods respectively located in the stop zone 1 and the stop zone 2 prop up the two side walls of the prostate, and at the same time, the elastic stop pressure rod located in the stop zone 3 is positioned against the prostate opening to prevent the stent body from migrating back into the bladder.

[0018] Preferably, a fixing cap is fixed to one end of the traction line outside the traction tube, and the fixing cap is fixedly connected to the end of the traction tube. When the position of the stent body is adjusted to the right position, the operator cuts off the fixing cap, pulls out the traction tube, and then observes whether the position of the stent body changes through the urethroscope body; finally, the relevant components are removed, so that the stent body remains alone in the human body, and the traction line is exposed outside the human body and fixed to the human genitals, thus completing the implantation of the stent body.

[0019] The present invention also provides an operating method of a stent system for treating prostatic urinary tract stenosis, comprising the following steps: Step 1: insert the obturator into the sheath tube through the assembly port until the obturator and the assembly port are firmly matched with each other, and then insert the obturator into the human body through the head of the obturator; Step 2: insert the traction tube into the stent guide tube through the end with the fixing cap, until the stent body and the elastic stop pressure rod are both retracted in the stent guide tube, at which time the end of the traction tube with the fixing cap is located outside the stent guide tube; Step 3, withdraw the obturator and insert the stent guide tube into the sheath tube from the main body assembly port; Step 4: Push the stent body and the elastic stop pressure rod into the bladder through the traction tube so that the stent body and the elastic stop pressure rod are both ejected; Step 5: Pull out the stent guide tube, pass the traction tube through the socket on the bridge tube, and assemble and fix the bridge tube to the main body through the assembly port; Step 6: insert the urethroscope body into the sheath along the bridge tube, observe the position of the stent body in the human body, and then rotate the traction tube to make the stent body in the ideal position; Step 7, slowly pull the traction tube outward to make the stent body retreat to the prostate until the elastic stop pressure rod located in the stop zone 3 just abuts against the prostate opening. At this time, the two elastic stop pressure rods located in the stop zone 1 and the stop zone 2 respectively open the two side walls of the prostate; Step 8, cut off the fixing cap, pull out the traction tube, and observe again through the urethroscope body whether the position of the stent body has changed; Step nine, sequentially withdraw the urethroscope body and the sheath, leaving the bracket body and the elastic stop rod in the body, and the traction wire part exposed outside the human body; Step 10: After one week, take out the bracket body and the elastic stop pressure rod.

[0020] It can be known from the above steps that in the present invention, the sheath can accommodate the urethroscope body and the bracket assembly at the same time, and the sheath only needs to be inserted and removed once, thereby achieving the purpose of minimal damage to the human body and convenient operation.

[0021] Preferably, in step ten, the traction wire exposed outside the body is passed through the head of the traction needle, and then the traction needle is inserted into the recovery tube to lead out the traction wire, so that the stent body and the elastic stop pressure rod can be taken out.

[0022] The beneficial effects of the present invention are as follows: the sheath only needs to be inserted and removed once, achieving the purpose of minimal damage to the human body and being easy to operate; the obturator, the bridge tube and the urethroscope body are quick and easy to install and remove, the installation is firm, the operation is convenient, and the structure is simple; the internal passage of the prostate is further enlarged, so that urination is smoother during the period when the stent is retained in the body; the V-shaped protrusion is more conducive to the contraction of the stent body and the diameter after contraction is smaller, so that the patient's pain is reduced when the stent is inserted into or removed from the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is an exploded view of the present invention; Figure 3 It is a front view of the present invention; Figure 4 yes Figure 3 Sectional view of AA in the middle; Figure 5 yes Figure 4 A magnified view of the structure at B in the middle; Figure 6 yes Figure 4 A magnified view of the structure at C in the middle; Figure 7 It is a schematic diagram of the structure of the locking pin; Figure 8 It is a schematic diagram of the structure when the obturator and the main body are matched; Fig. 9 It is a schematic diagram of the structure of the obturator; Fig.10 It is a schematic diagram of the structure of the present invention; Fig.11 It is a schematic diagram of the structure when the bracket body pops open; Fig.12 is an end view of the stent body; Fig.13 It is a front view of the present invention; Fig.14 yes Fig.13 Sectional view of AA in the middle; Fig.15 yes Fig.14 A magnified view of the structure at B in the middle; Fig.16 It is a schematic diagram of the structure when the traction needle and the recovery tube cooperate.

[0024] In the figure: 1. Main body, 2. Bridge tube, 3. Urethrascope body, 4. Bracket assembly, 5. Sheath tube, 6. Assembly port, 7. Socket, 8. Step surface 1, 9. Tube body, 10. Mounting seat, 11. Locking mechanism, 12. Positioning plug 1, 13. Step surface 2, 14. Slot, 15. Protruding shaft, 16. Handle 1, 17. Eyepiece end, 18. Mirror sheath, 19. Locking shaft, 20. Locking pin, 21. Matching groove, 22. U-shaped groove, 23. Lock tongue, 24. Locking area, 25. Through hole, 26. Guide head, 27. V-shaped lock groove, 28. Rectangular groove, 29. Limit bolt, 30. Obturator, 31. Handle 2, 32. Inserting shaft, 33. Positioning plug 2, 34. Head, 35. Stent body, 36. Connecting tube, 37. Elastic stop pressure rod, 38. Stent guide tube, 39. Traction tube, 40. Slot, 41. Proximal support rod, 42. Middle support rod, 43. Distal support rod, 44. V-shaped protrusion, 45. Stop zone one, 46. Stop zone two, 47. Stop zone three, 48. Fixing cap, 49. Traction needle, 50. Retrieval tube, 51. Traction line. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 8 In the illustrated embodiment, a stent system for treating prostate urinary tract stenosis comprises a main body 1, a bridge tube 2, a urethroscope body 3, a stent assembly 4 and an obturator 30. A sheath tube 5 is provided at one end of the main body 1, and one end of the sheath tube 5 is fixedly connected to the main body 1. An assembly port 6 matching the bridge tube 2 and the obturator 30 respectively is provided at the other end of the main body 1. The assembly port 6 is communicated with the interior of the sheath tube 5. The bridge tube 2 and the obturator 30 are both detachably connected to the assembly port 6. The urethroscope body 3 matches the interior of the bridge tube 2 and is detachably connected to the bridge tube 2. A socket 7 matching the stent assembly 4 is provided on the outside of the bridge tube 2. One end of the urethroscope body 3 is located outside the bridge tube 2, and the other end of the urethroscope body 3 passes through the bridge tube 2 and is located inside the sheath tube 5. One end of the stent assembly 4 passes through the socket 7 and is located on the side of the bridge tube 2, and the other end of the stent assembly 4 passes through the sheath tube 5 and is located outside the other end of the sheath tube 5.

[0027] like Figure 2 , Figure 4 and Figure 5As shown, one end of the assembly port 6 is close to the sheath tube 5, and the other end of the assembly port 6 is far away from the sheath tube 5. The caliber of the assembly port 6 close to the sheath tube 5 is smaller than the caliber of the assembly port 6 far away from the sheath tube 5. The side wall of the assembly port 6 close to the sheath tube 5 is inclined and its caliber gradually increases toward the other end of the assembly port 6. A step surface 8 is provided on the side wall of the assembly port 6. The side wall of the assembly port 6 close to the sheath tube 5 is connected with the side wall of the other end of the assembly port 6 through the step surface 8, and the bridge tube 2 is interference fit with the end of the assembly port 6 close to the sheath tube 5.

[0028] The bridge tube 2 includes a tube body 9 that matches the urethroscope body 3. A mounting seat 10 is provided at one end of the tube body 9. The mounting seat 10 is sleeved on the outside of the tube body 9 and fixedly connected to the tube body 9. The other end of the urethroscope body 3 passes through the tube body 9 and the main body 1 in sequence through the mounting seat 10 and is located in the sheath 5. A locking mechanism 11 that matches the urethroscope body 3 is provided on the mounting seat 10. The urethroscope body 3 is sealed and detachably connected to the tube body 9 through the mounting seat 10 and is locked and fixed by the locking mechanism 11. A positioning plug 12 is sleeved on the other end of the tube body 9. The positioning plug 12 is fixedly connected to the tube body 9. The tube body 9 is positioned in the assembly port 6 after an interference fit between the positioning plug 12 and one end of the assembly port 6 close to the sheath 5. The socket 7 is located on the positioning plug 12 and on the side of the tube body 9.

[0029] The positioning plug 12 is provided with a step surface 2 13 matching the step surface 1 8 , and the end of the assembly port 6 away from the sheath 5 is provided with a plurality of slots 14 , and the side wall of the positioning plug 12 is protrudingly fixed with a plurality of convex shafts 15 matching the slots 14 one by one.

[0030] like Figure 2 , Figure 4 and Figure 6 As shown, a handle 16 is provided on the urethroscope body 3, one end of the handle 16 is an eyepiece end 17, and the other end of the handle 16 is respectively connected to a mirror sheath 18 and a lock shaft 19 matching the locking mechanism 11, the mirror sheath 18 passes through the tube 9 and the main body 1 in sequence and is located in the sheath tube 5, the lock shaft 19 is located on the side of the mirror sheath 18, and the lock shaft 19 is fixedly connected to the handle 16.

[0031] like Figure 2 , Figure 6 and Figure 7As shown, the locking mechanism 11 includes a lock pin 20 which is perpendicular to the lock shaft 19, and a matching groove 21 which matches the lock pin 20 is provided on the mounting seat 10. One end of the lock pin 20 is located in the matching groove 21 and is elastically connected to the bottom of the matching groove 21. The other end of the lock pin 20 passes through the open end of the matching groove 21 and is located outside the matching groove 21. A U-shaped groove 22 which passes through the bottom side of the lock pin 20 is provided. A lock tongue 23 is fixed to one side of the U-shaped groove 22. A locking area 24 which is convenient for the lock shaft 19 to pass through is formed between the other side of the U-shaped groove 22 and the lock tongue 23. The mounting seat 10 is provided with a through hole 25 matching the lock shaft 19, the through hole 25 is connected to the matching groove 21 and corresponds to the locking area 24, one end of the lock shaft 19 is fixedly connected to the handle 16, and the other end of the lock shaft 19 is provided with a conical guide head 26, and the lock shaft 19 is provided with a V-shaped lock groove 27 matching the lock tongue 23, and a rectangular groove 28 is provided on the top side of the lock pin 20, and the length direction of the rectangular groove 28 is parallel to the depth direction of the matching groove 21, and a limit bolt 29 matching the rectangular groove 28 is threadedly connected to the mounting seat 10.

[0032] like Figure 8 and Fig. 9 As shown, the obturator 30 includes a handle 31 and an insert shaft 32 matching the inside of the sheath tube 5, a positioning plug 33 is provided at one end of the insert shaft 32, the insert shaft 32 is fixedly connected to the handle 31 through the positioning plug 33, the insert shaft 32 is positioned in the assembly port 6 after interference fit with the end of the assembly port 6 close to the sheath tube 5 through the positioning plug 33, the handle 31 is located outside one end of the sheath tube 5, the other end of the insert shaft 32 closes the other end of the sheath tube 5 and is provided with an arc-shaped head 34, the head 34 is located outside the other end of the sheath tube 5. The positioning plug 33 is provided with a step surface 13 matching the step surface 8, the end of the assembly port 6 away from the sheath tube 5 is provided with a plurality of card slots 14, and the side wall of the positioning plug 33 is protruding and fixed with a plurality of convex shafts 15 matching the card slots 14 one by one.

[0033] like Fig.10 , Fig.11 , Fig.13 , Fig.14 and Fig.15As shown, the bracket assembly 4 includes a bracket body 35, a connecting tube 36, three elastic stop pressure rods 37, a bracket guide tube 38 and a traction tube 39 matching the socket 7. The bracket body 35 is a hollow three-dimensional structure formed by shaping a plurality of elastic closed wires. The three elastic stop pressure rods 37 are distributed along the circumference of the connecting tube 36 and are respectively located at corresponding hollow positions of the bracket body 35. After one end of the bracket body 35 shrinks inwardly, it is fixed in one end of the connecting tube 36 at the same time as the end of the elastic stop pressure rod 37. The other end of the bracket body 35 opens outward in an arc shape, two of which are gradually inclined outward linearly, and the other elastic stop pressure rod 37 is fixed in one end of the connecting tube 36. 7 is opened outward in an arc shape to form a leaf shape, the other end of the connecting tube 36 is fixed with a traction line 51 and a slot 40 matching the traction tube 39 is provided on its end surface, one end of the traction line 51 is located in the traction tube 39, and the other end of the traction line 51 is located outside the traction tube 39, the connecting tube 36 is slidably connected with the inside of the stent guide tube 38, the stent body 35 and the elastic stop pressure rod 37 can be retracted in the stent guide tube 38, one end of the traction tube 39 matches the slot 40 and is located in one end of the stent guide tube 38, the other end of the traction tube 39 passes through the other end of the stent guide tube 38 and is located outside the stent guide tube 38, and the traction tube 39 is slidably connected with the stent guide tube 38.

[0034] like Fig.11 and Fig.12 As shown, the bracket body 35 includes a proximal support rod 41, a middle support rod 42 and a distal support rod 43. The number of the proximal support rod 41, the middle support rod 42 and the distal support rod 43 is three. One end of the proximal support rod 41 is fixed in one end of the connecting tube 36, and the other end of the proximal support rod 41 is fixedly connected to one end of the corresponding middle support rod 42 to form a whole. The middle support rod 42 and the connecting tube 36 are parallel to each other. The proximal support rod 41 is inclined and the angle formed with the middle support rod 42 is an obtuse angle. The other end of each adjacent two middle support rods 42 is fixedly connected to form a whole through the corresponding distal support rod 43. The distal support rod 43 is V-shaped and opens outward in an arc shape from its two ends to the middle. The middle of the distal support rod 43 forms a V-shaped protrusion 44 after a smooth transition through the arc structure.

[0035] like Fig.12As shown, three proximal support rods 41 are respectively distributed at the five o'clock, seven o'clock and twelve o'clock positions, a stop zone one 45 is formed between the proximal support rod 41 corresponding to the five o'clock position and the proximal support rod 41 corresponding to the twelve o'clock position, a stop zone two 46 is formed between the proximal support rod 41 corresponding to the seven o'clock position and the proximal support rod 41 corresponding to the twelve o'clock position, and a stop zone three 47 is formed between the proximal support rod 41 corresponding to the five o'clock position and the proximal support rod 41 corresponding to the seven o'clock position, wherein two elastic stop pressure rods 37 which are linearly and gradually inclined outwardly are respectively located in the stop zone one 45 and the stop zone two 46 and their lengths are both smaller than the other leaf-shaped elastic stop pressure rod 37, and the other elastic stop pressure rod 37 which is arc-shaped and opens outwardly to form a leaf shape is located in the stop zone three 47.

[0036] like Fig.10 and Fig.11 As shown, a fixing cap 48 is fixed to one end of the traction line 51 outside the traction tube 39 , and the fixing cap 48 is fixedly connected to the end of the traction tube 39 .

[0037] The present invention also provides an operating method of a stent system for treating prostatic urinary tract stenosis, comprising the following steps: Step 1: insert the obturator 30 into the sheath tube 5 through the assembly port 6 until the obturator 30 and the assembly port 6 are firmly matched with each other, and then insert the obturator 30 into the human body through the head 34; Step 2: insert the traction tube 39 into the stent guide tube 38 through the end provided with the fixing cap 48, until the stent body 35 and the elastic stop pressure rod 37 are both retracted in the stent guide tube 38, at which time the end of the traction tube 39 provided with the fixing cap 48 is located outside the stent guide tube 38; Step 3, withdraw the obturator 30, and insert the stent guide tube 38 into the sheath tube 5 from the assembly port 6 of the main body 1; Step 4: Push the stent body 35 and the elastic stop pressure rod 37 into the bladder through the traction tube 39 so that the stent body 35 and the elastic stop pressure rod 37 are both ejected; Step 5: Pull out the stent guide tube 38, and insert the traction tube 39 through the socket 7 on the bridge tube 2, and assemble and fix the bridge tube 2 to the main body 1 through the assembly opening 6; Step 6: insert the urethroscope body 3 into the sheath tube 5 along the bridge tube 2, observe the position of the support body 35 in the human body, and then rotate the traction tube 39 to make the support body 35 in the ideal position; Step 7, slowly pull the traction tube 39 outward to make the stent body 35 retreat to the prostate until the elastic stop pressure rod 37 located in the stop zone 3 47 just abuts against the prostate opening. At this time, the two elastic stop pressure rods 37 located in the stop zone 1 45 and the stop zone 2 46 respectively open the two side walls of the prostate; Step 8, cut off the fixing cap 48, pull out the traction tube 39, and observe again through the urethroscope body 3 whether the position of the bracket body 35 has changed; Step nine, sequentially withdraw the urethroscope body 3 and the sheath 5, leaving the support body 35 and the elastic stop rod 37 in the body, and partially exposing the traction line 51 outside the body; Step 10: After one week, take out the bracket body 35 and the elastic stop pressure rod 37.

[0038] like Fig.16 As shown, in step ten, the traction wire 51 exposed outside the body is passed through the head 34 of the traction needle 49, and then the traction needle 49 is inserted into the recovery tube 50 to lead out the traction wire 51, and the stent body 35 and the elastic stop pressure rod 37 can be taken out.

[0039] In the above steps, since the head of the sheath tube 5 is relatively sharp, direct insertion into the human body will cause damage to the human body, so it is necessary to insert the obturator 30 through the arc-shaped head 34 to reduce damage to the human body. When installing the obturator 30, the second positioning plug 33 is inserted into the assembly port 6, so that the second positioning plug 33 and the end of the assembly port 6 close to the sheath tube 5 are interference-fitted, while the second step surface 13 is limited to the first step surface 8, and the convex shaft 15 is inserted into the corresponding slot 14 to prevent radial deflection, so as to improve the positioning effect of the obturator 30.

[0040] When installing the bridge tube 2, insert the positioning plug 12 into the assembly port 6 so that the positioning plug 12 and the end of the assembly port 6 close to the sheath tube 5 are interference fit, and the step surface 13 is limited on the step surface 8, and the convex shaft 15 is inserted into the corresponding groove 14 to prevent radial deflection, so as to improve the positioning effect of the bridge tube 2.

[0041] When assembling the urethroscope body 3, the mirror sheath 18 is inserted into the sheath tube 5 through the tube body on the bridge tube 2. During this process, the lock shaft 19 overcomes the elastic effect through the guide head 26 and is gradually inserted into the locking area 24, and the lock pin 20 moves to the bottom of the matching groove 21 until the lock tongue 23 is stuck in the V-shaped lock groove 27, so that the urethroscope body 3 and the bridge tube 2 are locked when assembled; conversely, when the urethroscope body 3 needs to be disassembled, the operator only needs to press the end of the lock pin 20 located outside the matching groove 21 inward to disengage the lock tongue 23 from the V-shaped lock groove 27, and then pull out the urethroscope body 3, which is simple to operate.

Claims

1. A stent system for treating prostatic urinary tract stenosis, characterized in that: The urethroscope comprises a main body (1), a bridge tube (2), a urethroscope main body (3), a bracket assembly (4) and an obturator (30), wherein one end of the main body (1) is provided with a sheath tube (5), one end of the sheath tube (5) is fixedly connected to the main body (1), and the other end of the main body (1) is provided with an assembly opening (6) respectively matching the bridge tube (2) and the obturator (30), the assembly opening (6) being connected to the inside of the sheath tube (5), the bridge tube (2) and the obturator (30) being detachably connected to the assembly opening (6), and the urethroscope main body (3 ) matches the interior of the bridge tube (2) and is detachably connected to the bridge tube (2); a socket (7) matching the bracket assembly (4) is provided on the outside of the bridge tube (2); one end of the urethroscope body (3) is located outside the bridge tube (2); the other end of the urethroscope body (3) passes through the bridge tube (2) and is located inside the sheath tube (5); one end of the bracket assembly (4) passes through the socket (7) and is located on the side of the bridge tube (2); the other end of the bracket assembly (4) passes through the sheath tube (5) and is located outside the other end of the sheath tube (5).

2. A stent system for treating prostatic urinary tract stenosis according to claim 1, characterized in that: One end of the assembly opening (6) is close to the sheath tube (5), and the other end of the assembly opening (6) is far from the sheath tube (5); the caliber of the end of the assembly opening (6) close to the sheath tube (5) is smaller than the caliber of the end of the assembly opening (6) far from the sheath tube (5); the side wall of the assembly opening (6) close to the sheath tube (5) is inclined, and its caliber gradually increases toward the other end of the assembly opening (6); a step surface (8) is provided on the side wall of the assembly opening (6); the side wall of the assembly opening (6) close to the sheath tube (5) is connected to the side wall of the other end of the assembly opening (6) through the step surface (8); and the bridge tube (2) is interference fit with the end of the assembly opening (6) close to the sheath tube (5).

3. A stent system for treating prostatic urinary tract stenosis according to claim 2, characterized in that: The bridge tube (2) comprises a tube body (9) matching the urethroscope body (3); one end of the tube body (9) is provided with a mounting seat (10); the mounting seat (10) is sleeved outside the tube body (9) and fixedly connected to the tube body (9); the other end of the urethroscope body (3) passes through the tube body (9) and the main body (1) in sequence through the mounting seat (10) and is then located in the sheath tube (5); the mounting seat (10) is provided with a locking mechanism (11) matching the urethroscope body (3); the urethroscope body (3) is The body (3) is sealed and detachably connected to the tube body (9) through a mounting seat (10) and is locked and fixed through a locking mechanism (11); the other end of the tube body (9) is sleeved with a positioning plug (12); the positioning plug (12) is fixedly connected to the tube body (9); the tube body (9) is positioned in the assembly opening (6) after interference fit between the positioning plug (12) and one end of the assembly opening (6) close to the sheath tube (5); the socket (7) is located on the positioning plug (12) and on the side of the tube body (9).

4. A stent system for treating prostatic urinary tract stenosis according to claim 3, characterized in that: The positioning plug (12) is provided with a step surface (13) matching the step surface (8), and the end of the assembly opening (6) away from the sheath tube (5) is provided with a plurality of slots (14), and a plurality of convex shafts (15) matching the slots (14) are protrudingly fixed on the side wall of the positioning plug (12).

5. A stent system for treating prostatic urinary tract stenosis according to claim 3 or 4, characterized in that: The urethroscope body (3) is provided with a handle 1 (16), one end of the handle 1 (16) being an eyepiece end (17), and the other end of the handle 1 (16) being respectively connected to a mirror sheath (18) and a lock shaft (19) matching the locking mechanism (11), the mirror sheath (18) passing through the tube body (9) and the main body (1) in sequence and then being located in the sheath tube (5), the lock shaft (19) being located on the side of the mirror sheath (18), and the lock shaft (19) being fixedly connected to the handle 1 (16).

6. A stent system for treating prostatic urinary tract stenosis according to claim 5, characterized in that: The locking mechanism (11) comprises a locking pin (20) which is perpendicular to the locking shaft (19); a matching groove (21) which matches the locking pin (20) is provided on the mounting seat (10); one end of the locking pin (20) is located in the matching groove (21) and is elastically connected to the bottom of the matching groove (21); the other end of the locking pin (20) passes through the opening end of the matching groove (21) and is located outside the matching groove (21); a U-shaped groove (22) which passes through the bottom side of the locking pin (20); a locking tongue (23) is fixed to one side of the U-shaped groove (22); a locking area (24) which is convenient for the locking shaft (19) to pass through is formed between the other side of the U-shaped groove (22) and the locking tongue (23); The mounting seat (10) is provided with a through hole (25) matching with the lock shaft (19), the through hole (25) is connected with the matching groove (21) and corresponds to the locking area (24), one end of the lock shaft (19) is fixedly connected with the handle (16), the other end of the lock shaft (19) is provided with a conical guide head (26), the lock shaft (19) is provided with a V-shaped lock groove (27) matching with the lock tongue (23), the top side of the lock pin (20) is provided with a rectangular groove (28), the length direction of the rectangular groove (28) is parallel to the depth direction of the matching groove (21), and a limit bolt (29) matching with the rectangular groove (28) is threadedly connected to the mounting seat (10).

7. A stent system for treating prostatic urinary tract stenosis according to claim 2, characterized in that: The obturator (30) comprises a second handle (31) and an insertion shaft (32) matched with the interior of the sheath tube (5); a second positioning plug (33) is provided at one end of the insertion shaft (32); the insertion shaft (32) is fixedly connected to the second handle (31) via the second positioning plug (33); the insertion shaft (32) is positioned in the assembly opening (6) after interference fit with one end of the assembly opening (6) close to the sheath tube (5) via the second positioning plug (33); the second handle (31) is located outside one end of the sheath tube (5); the other end of the insertion shaft (32) closes the other end of the sheath tube (5) and is provided with an arc-shaped head (34); the head (34) is located outside the other end of the sheath tube (5).

8. A stent system for treating prostatic urinary tract stenosis according to claim 7, characterized in that: The second positioning plug (33) is provided with a second step surface (13) matching the first step surface (8), the end of the assembly opening (6) away from the sheath tube (5) is provided with a plurality of slots (14), and a plurality of convex shafts (15) matching the slots (14) are protrudingly fixed on the side wall of the second positioning plug (33).

9. A stent system for treating prostatic urinary tract stenosis according to claim 1, characterized in that: The support assembly (4) comprises a support body (35), a connecting tube (36), three elastic stop pressure rods (37), a support guide tube (38) and a traction tube (39) matching the socket (7); the support body (35) is a hollow three-dimensional structure formed by shaping a plurality of elastic closed wires; the three elastic stop pressure rods (37) are distributed along the circumference of the connecting tube (36) and are respectively located at corresponding hollow positions of the support body (35); one end of the support body (35) is retracted inwardly and fixed to one end of the connecting tube (36) together with the end of the elastic stop pressure rod (37); the other end of the support body (35) is opened outwardly in an arc shape, wherein two of the elastic stop pressure rods (37) are gradually inclined outwardly in a linear manner, and the other elastic stop pressure rod (37) is opened outwardly in an arc shape. The connecting tube (36) is formed into a leaf shape, the other end of which is fixed with a traction line (51) and the end surface of which is provided with a slot (40) matching the traction tube (39), one end of the traction line (51) is located in the traction tube (39), and the other end of the traction line (51) is located outside the traction tube (39), the connecting tube (36) is slidably connected to the inside of the stent guide tube (38), the stent body (35) and the elastic stop pressure rod (37) can be retracted into the stent guide tube (38), one end of the traction tube (39) matches the slot (40) and is located in one end of the stent guide tube (38), the other end of the traction tube (39) penetrates the other end of the stent guide tube (38) and is located outside the stent guide tube (38), and the traction tube (39) is slidably connected to the stent guide tube (38).

10. A stent system for treating prostatic urinary tract stenosis according to claim 9, characterized in that: The stent body (35) comprises a proximal support rod (41), a middle support rod (42) and a distal support rod (43), wherein the number of the proximal support rod (41), the middle support rod (42) and the distal support rod (43) are three, one end of the proximal support rod (41) is fixed in one end of the connecting tube (36), and the other end of the proximal support rod (41) is fixedly connected to one end of the corresponding middle support rod (42) to form an integral body, and the middle support rod (42) is fixedly connected to one end of the corresponding middle support rod (42) to form an integral body. ) are parallel to the connecting tube (36), the proximal support rod (41) is inclined and the angle formed with the middle support rod (42) is an obtuse angle, the other ends of each two adjacent middle support rods (42) are fixedly connected and formed as a whole through the corresponding distal support rod (43), the distal support rod (43) is V-shaped and opens outward in an arc shape from its two ends to the middle, and the middle of the distal support rod (43) forms a V-shaped protrusion (44) after a smooth transition through the arc structure.

11. A stent system for treating prostatic urinary tract stenosis according to claim 10, characterized in that: The three proximal support rods (41) are respectively distributed at the positions of five o'clock, seven o'clock and twelve o'clock. A stop zone one (45) is formed between the proximal support rod (41) corresponding to the five o'clock position and the proximal support rod (41) corresponding to the twelve o'clock position. A stop zone two (46) is formed between the proximal support rod (41) corresponding to the seven o'clock position and the proximal support rod (41) corresponding to the twelve o'clock position. A stop zone three (47) is formed between the proximal support rod (41) corresponding to the five o'clock position and the proximal support rod (41) corresponding to the seven o'clock position. Two linear elastic stop pressure rods (37) that gradually tilt outward are respectively located in the stop zone one (45) and the stop zone two (46) and their lengths are both shorter than the other leaf-shaped elastic stop pressure rod (37). Another elastic stop pressure rod (37) that opens outward in an arc shape to form a leaf shape is located in the stop zone three (47).

12. A stent system for treating prostatic urinary tract stenosis according to claim 9, characterized in that: A fixing cap (48) is fixed to one end of the traction line (51) located outside the traction tube (39), and the fixing cap (48) is fixedly connected to the end of the traction tube (39).

13. The method for operating a stent system for treating prostatic urinary tract stenosis according to claim 12, characterized in that: The following steps are involved: Step 1, inserting the obturator (30) into the sheath tube (5) through the assembly opening (6) until the obturator (30) and the assembly opening (6) are firmly matched with each other, and then inserting the obturator (30) into the human body through the head (34); Step 2: inserting the traction tube (39) into the stent guide tube (38) through one end thereof provided with a fixing cap (48) until the stent body (35) and the elastic stop pressure rod (37) are both retracted into the stent guide tube (38), at which time the end of the traction tube (39) provided with the fixing cap (48) is located outside the stent guide tube (38); Step 3, withdraw the obturator (30), and insert the stent guide tube (38) into the sheath tube (5) from the assembly port (6) of the main body (1); Step 4: Push the stent body (35) and the elastic stop pressure rod (37) into the bladder through the traction tube (39) so that the stent body (35) and the elastic stop pressure rod (37) are both ejected; Step 5, extract the stent guide tube (38), insert the traction tube (39) through the socket (7) on the bridge tube (2), and assemble and fix the bridge tube (2) to the main body (1) through the assembly opening (6); Step 6: insert the urethroscope body (3) into the sheath tube (5) along the bridge tube (2), observe the position of the stent body (35) in the human body, and then rotate the traction tube (39) so that the stent body (35) is in an ideal position; Step 7, slowly pull the traction tube (39) outwards to make the stent body (35) retreat to the prostate until the elastic stop pressure rod (37) located in the stop zone three (47) just abuts against the prostate opening. At this time, the two elastic stop pressure rods (37) located in the stop zone one (45) and the stop zone two (46) respectively open the two side walls of the prostate; Step eight, cutting off the fixing cap (48), pulling out the traction tube (39), and observing again through the urethroscope body (3) whether the position of the bracket body (35) has changed; Step nine, sequentially withdrawing the urethroscope body (3) and the sheath tube (5), leaving the support body (35) and the elastic stop rod (37) inside the body, and partially exposing the traction line (51) outside the body; Step 10: After one week, remove the bracket body (35) and the elastic stop pressure rod (37).

14. The method for operating a stent system for treating prostatic urinary tract stenosis according to claim 13, characterized in that: In step ten, the traction wire (51) exposed outside the body is passed through the head (34) of the traction needle (49), and then the traction needle (49) is inserted into the recovery tube (50) to lead out the traction wire (51), and then the stent body (35) and the elastic stop pressure rod (37) can be removed.

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