A stent system and operation method for treating prostatic urinary tract stenosis

Abstract

The present invention discloses a stent system and operating method for treating prostate urinary tract stenosis. The 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 sheath tube, one end of the sheath tube is fixedly connected to the main body, and the other end of the main body is provided with an assembly port respectively matching the bridge tube and the obturator, the assembly port being connected to the interior of the sheath tube, and the bridge tube and the obturator are both detachably connected to the assembly port. The urethroscope body matches the interior of the bridge tube and is detachably connected to the bridge tube. The outer side of the bridge tube is provided with a socket matching the stent assembly. One end of the urethroscope body is located outside the bridge tube, and the other end of the urethroscope body passes through the bridge tube and is located inside the sheath tube. One end of the stent assembly passes through the socket and is located on the side of the bridge tube, and the other end of the stent assembly passes through the sheath tube and is located outside the other end of the sheath tube. The beneficial effect of the present invention is that the sheath tube only needs to be inserted and removed once, achieving the purpose of minimizing damage to the human body.

Description

Technical Field

[0001] The present invention relates to the technical field related to stent systems 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] Benign prostatic hyperplasia (BPH) is a common, progressive disease in older men that can cause urethral strictures, difficulty urinating, and even complete urethral obstruction. With the aging population, the incidence rate is increasing annually. Domestic statistics indicate that approximately 35% to 50% of men over 50 have varying degrees of BPH. Currently, transurethral resection of the prostate (TURP) is the primary treatment for BPH. Due to its non-invasive nature and rapid recovery, it accounts for 60% to 90% of BPH cases in developed countries and is the primary treatment. However, this procedure is still invasive and highly dependent on the surgeon's proficiency and the patient's physical condition. Furthermore, it has a long learning curve and is expensive.

[0003] Urethral stent (or prostate stent) implantation has seen significant development in my country in recent years. Currently, a common clinical approach involves placing a urethral stent at the site of urethral stricture to dilate the narrowed or blocked area. These stents, made of stainless steel, synthetic fiber silicone, or nickel-titanium alloy, can be placed through a urethroscopic lens into the urethral stricture to dilate the previously narrowed and closed posterior urethra. This procedure can restore urination function in most patients with dysuria.

[0004] In the prior art, during actual operation, an obturator is inserted into the sheath and then inserted into the human body through the obturator. When one end of the sheath is delivered to the corresponding position in the human body, the obturator is removed, and then the stent assembly, which includes a stent guide tube, a traction tube, and a stent, is inserted into the sheath. After the stent is delivered to the human body, the sheath and the stent guide tube are removed 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 stent position. In the above process, the sheath needs to be inserted and removed twice to insert the stent and the urethroscope respectively. This operation not only has the problem of easily causing significant damage to the human body, but also is cumbersome and 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 easily causes serious damage to the human body, and provides a stent system and operation method for treating prostate urinary tract stenosis with less damage to the human body.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A stent system for treating prostate urinary tract stenosis, comprising a main body, a bridge tube, a urethroscope body, a stent assembly and an obturator, wherein a sheath tube is provided at one end of the main body, 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, which matches the bridge tube and the obturator respectively, and the assembly port is communicated with the interior of the sheath tube, and the bridge tube and the obturator are both detachably connected to the assembly port, the urethroscope body matches the interior 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 body is located outside the bridge tube, and the other end of the urethroscope body passes through the bridge tube and is located inside the sheath tube, one end of the stent assembly passes through the socket and is located on the side of the bridge tube, and the other end of the stent assembly passes through the sheath tube and is located outside the other end of the sheath tube.

[0008] The urethroscope comprises a main body, a bridge tube, a urethroscope body, a bracket assembly and an obturator. One end of the main body is provided with a sheath tube, one end of the sheath tube is fixedly connected to the main body, and the other end of the main body is provided with an assembly port that matches the bridge tube and the obturator respectively, 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. The outside of the bridge tube is provided with a socket that matches the bracket assembly. One end of the urethroscope body is located outside the bridge tube, and the other end of the urethroscope body passes through the bridge tube and is located in the sheath tube. One end of the bracket assembly passes through the socket and is located on the side of the bridge tube, and the other end of the bracket assembly passes through the sheath tube and is located outside the other end of the sheath tube. During operation, the obturator is first inserted into the sheath, and then inserted into the human body through the obturator. When one end of the sheath 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 so that the corresponding part 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 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 can accommodate the urethroscope body and the bracket assembly at the same time, and only needs to be inserted and removed once, thereby achieving the purpose of minimal damage to the human body and convenient operation.

[0009] Preferably, one end of the assembly port is close to the sheath tube, and the other end of the assembly port is away from the sheath tube. The diameter of the assembly port close to the sheath tube is smaller than the diameter of the assembly port away from the sheath tube. The side wall of the assembly port close to the sheath tube is inclined and its diameter 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 is connected to the side wall of the other end of the assembly port through the step surface 1. The bridge tube is interference-fitted with the end of the assembly port close to the sheath tube. This facilitates installation and removal of the bridge tube, is easy to operate, and has a simple structure. At the same time, the structural design of the assembly port facilitates the smooth insertion of the bridge tube.

[0010] 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 the end of the assembly port near the sheath, the socket is located on the positioning plug 1 and on the side of the tube body. When installing the bridge tube, the positioning plug 1 is inserted into the assembly port so that the positioning plug 1 has an interference fit with the end of the assembly port near the sheath, which makes installation and disassembly convenient and quick, and has a simple structure.

[0011] Preferably, the first positioning plug is provided with a second stepped surface that matches the first stepped surface. A plurality of slots are provided at the end of the assembly opening distal from the sheath tube. A plurality of protruding shafts are fixedly protruding from the sidewall of the first positioning plug, each of which matches the slots. When installing the bridge tube, the first positioning plug is inserted into the assembly opening, ensuring an interference fit between the first positioning plug and the end of the assembly opening proximal to the sheath tube. The second stepped surface is positioned confined to the first stepped surface, and the protruding shafts engage in corresponding slots to prevent radial deflection and improve the positioning of the bridge tube.

[0012] 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 connected to a sheath and a locking shaft that matches a locking mechanism. The sheath passes through the tubular body and the main body in sequence and is located within the sheath tube. The locking shaft is located on the side of the sheath and is fixedly connected to the handle 1. The urethroscope body matches the locking mechanism via the locking shaft, so that the urethroscope body can be locked and fixed after being inserted into place through the tubular body.

[0013] The locking mechanism comprises a locking pin which is perpendicular to the locking shaft, the mounting base being provided with a matching slot which matches the locking pin, the mounting base being provided with a rectangular slot, the length direction of the rectangular slot being parallel to the depth direction of the matching slot, and the mounting base being threadedly connected to a limit bolt which matches the rectangular slot. 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 by overcoming the elastic effect of the guide head, and the lock pin moves toward 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 disengage the lock tongue from the V-shaped lock groove, and then pull out the urethroscope body. The operation is simple; 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 smooth insertion of the lock shaft into the locking area.

[0014] Preferably, the obturator comprises a handle 2 and an insert shaft that matches the interior of the sheath tube, one end of the insert shaft is provided with a positioning plug 2, the insert shaft is fixedly connected to the handle 2 via the positioning plug 2, the insert shaft is positioned in the assembly port after interference fit with the end of the assembly port near the sheath tube via the positioning plug 2, the handle 2 is located outside one end of the sheath tube, the other end of the insert 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 and the end of the assembly port near the sheath tube have an interference fit, the installation and disassembly is convenient and quick, and the structure is simple; since 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.

[0015] Preferably, the second positioning plug is provided with a second stepped surface that matches the first stepped surface, and a plurality of slots are provided at the end of the assembly opening distal from the sheath. A plurality of protruding shafts are protruding and fixed to the sidewall of the second positioning plug, each of which matches the slots. When installing the obturator, the second positioning plug is inserted into the assembly opening, ensuring an interference fit between the second positioning plug and the end of the assembly opening proximal to the sheath. The second stepped surface is positioned confined to the first stepped surface, and the protruding shafts are engaged in corresponding slots to prevent radial deflection, thereby improving the positioning effect of the obturator.

[0016] Preferably, the bracket assembly includes 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. After one end of the bracket body is retracted inwardly, it is 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 which are linearly inclined outwards, and the other elastic stop pressure rod is linearly inclined outwards. The dynamic pressure rod is arc-shaped and opens outward to form a leaf shape. A traction wire 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 wire is located inside the traction tube, and the other end of the traction wire is located outside the traction tube. The connecting tube is slidingly connected to the interior 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 inside 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 slidingly 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 to prevent the stent from migrating back into the bladder; at the same time, the two elastic stop pressure rods that are linearly and gradually tilted outwards stretch the two side walls of the prostate, further expanding the internal channel of the prostate, making urination smoother while the stent remains in the body; in the initial state, the stent body and the elastic stop pressure rods 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 rods 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 the 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.

[0017] 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 is three, one end of the proximal support rod is fixed in one end of the connecting tube, and 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 is fixedly connected to the corresponding distal support rod to form a whole, 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. The stent body in the expanded 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. Over time, 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.

[0018] Preferably, the three proximal support rods are respectively located at the 5 o'clock, 7 o'clock, and 12 o'clock positions. A first stop zone 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 second stop zone 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. A third stop zone 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. Two linear elastic stop pressure rods that gradually tilt outward are respectively located in stop zone 1 and stop zone 2 and are shorter than the other leaf-shaped elastic stop pressure rod. Another elastic stop pressure rod that expands outward in an arc shape to form a leaf shape is located in stop zone 3. The two elastic stop pressure rods located in stop zone 1 and stop zone 2 respectively prop up the two side walls of the prostate. At the same time, the elastic stop pressure rod located in stop zone 3 abuts against the prostate opening for positioning, thereby preventing the stent body from migrating back into the bladder.

[0019] Preferably, a fixing cap is fixed to one end of the traction line located outside the traction tube, and the fixing cap is fixedly connected to the end of the traction tube. Once the stent body is positioned properly, the operator cuts off the fixing cap, removes the traction tube, and then observes the stent body through the urethroscope body to see if the position has changed. Finally, the operator removes the relevant components, leaving the stent body alone in the human body, and the traction line exposed and fixed to the human genitals, thus completing the implantation of the stent body.

[0020] The present invention also provides an operating method of a stent system for treating prostatic urinary tract stenosis, comprising the following steps:

[0021] Step 1: insert the obturator into the sheath through the assembly port until the obturator and the assembly port are firmly fitted with each other, and then insert the obturator into the human body through the head of the obturator;

[0022] 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 into the stent guide tube. At this time, the end of the traction tube with the fixing cap is located outside the stent guide tube.

[0023] Step 3: Pull out the obturator and insert the stent guide tube into the sheath tube from the main assembly port;

[0024] 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;

[0025] 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;

[0026] Step 6: Insert the urethroscope 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;

[0027] Step 7: Slowly pull the traction tube outward to retract the stent body to the prostate until the elastic stop pressure rod located in the stop zone 3 just rests against the prostate opening. At this point, the two elastic stop pressure rods located in the stop zone 1 and stop zone 2 respectively hold the two sides of the prostate wall apart.

[0028] Step 8: Cut off the fixing cap, pull out the traction tube, and observe the position of the stent body again through the urethroscope body to see if it has changed;

[0029] Step nine, sequentially withdrawing the urethroscope body and the sheath, leaving the stent body and the elastic stop rod inside the body, and the traction wire part exposed outside the body;

[0030] Step 10: After one week, remove the bracket body and the elastic stop pressure rod.

[0031] It can be seen 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, achieving the purpose of minimal damage to the human body and easy operation.

[0032] 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, and the stent body and the elastic stop pressure rod can be taken out.

[0033] 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 easy operation; 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, making urination smoother while 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

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 is an exploded view of the present invention;

[0036] Figure 3 It is a front view of the present invention;

[0037] Figure 4 yes Figure 3 Cross-sectional view of AA;

[0038] Figure 5 yes Figure 4 A magnified view of the structure at B in the middle;

[0039] Figure 6 yes Figure 4 A magnified view of the structure at C in the middle;

[0040] Figure 7 It is a structural diagram of the lock pin;

[0041] Figure 8 It is a schematic diagram of the structure of the obturator and the main body when they are in cooperation;

[0042] Figure 9 It is a schematic diagram of the structure of the obturator;

[0043] Figure 10 It is a structural schematic diagram of the present invention;

[0044] Figure 11 It is a schematic diagram of the structure when the bracket body is ejected;

[0045] Figure 12 is an end view of the stent body;

[0046] Figure 13 It is a front view of the present invention;

[0047] Figure 14 yes Figure 13 Cross-sectional view of AA;

[0048] Figure 15 yes Figure 14 A magnified view of the structure at B in the middle;

[0049] Figure 16 This is a structural diagram of the traction needle and the recovery tube when they work together.

[0050] Figure: 1. Main body, 2. Bridge tube, 3. Urethrascope body, 4. Bracket assembly, 5. Sheath, 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. Scope 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 locking 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 1, 46. Stop zone 2, 47. Stop zone 3, 48. Fixing cap, 49. Traction needle, 50. Retrieval tube, 51. Traction line. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1 、 Figure 2 、 Figure 3 and Figure 8 In the embodiment shown, a stent system for treating prostate urinary tract stenosis includes a main body 1, a bridge tube 2, a urethroscope body 3, a stent assembly 4 and an obturator 30. A sheath 5 is provided at one end of the main body 1, and one end of the sheath 5 is fixedly connected to the main body 1. The other end of the main body 1 is provided with an assembly port 6 that matches the bridge tube 2 and the obturator 30 respectively. The assembly port 6 is communicated with the interior of the sheath 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 that matches 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 in the sheath 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 5 and is located outside the other end of the sheath 5.

[0053] 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 away from the sheath tube 5. The diameter of the assembly port 6 close to the sheath tube 5 is smaller than the diameter of the assembly port 6 away from the sheath tube 5. The side wall of the assembly port 6 close to the sheath tube 5 is inclined and its diameter 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.

[0054] The bridge tube 2 includes a tube body 9 that matches the urethroscope body 3. One end of the tube body 9 is provided with a mounting seat 10, which 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. The other end of the tube body 9 is sleeved with a positioning plug 12, which 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.

[0055] The positioning plug 12 is provided with a step surface 2 13 that matches 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. The side wall of the positioning plug 12 is protruding and fixed with a plurality of protruding shafts 15 that match the slots 14 one by one.

[0056] 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 the eyepiece end 17, and the other end of the handle 16 is 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 is fixedly connected to the handle 16.

[0057] like Figure 2 、 Figure 6 and Figure 7As shown, the locking mechanism 11 includes a lock pin 20 that is perpendicular to the lock shaft 19. A matching groove 21 that matches the lock pin 20 is provided on the mounting base 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 that 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 that 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 that matches 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. 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 that matches 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. A limit bolt 29 that matches the rectangular groove 28 is threadedly connected to the mounting seat 10.

[0058] like Figure 8 and Figure 9 As shown, the obturator 30 includes a second handle 31 and an insert shaft 32 that matches the interior of the sheath tube 5. A second positioning plug 33 is provided at one end of the insert shaft 32, which is fixedly connected to the second handle 31 via the second positioning plug 33. The insert shaft 32 is positioned within the assembly opening 6 after an interference fit with the end of the assembly opening 6 near 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 insert shaft 32 seals the other end of the sheath tube 5 and is provided with an arcuate head 34, which is located outside the other end of the sheath tube 5. The second positioning plug 33 is provided with a second step surface 13 that matches the first step surface 8. The end of the assembly opening 6 away from the sheath tube 5 is provided with a plurality of retaining grooves 14. A plurality of protruding shafts 15 that match the retaining grooves 14 are protruding and fixed on the side wall of the second positioning plug 33.

[0059] like Figure 10 、 Figure 11 、 Figure 13 、 Figure 14 and Figure 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 several 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 the corresponding hollow positions of the bracket body 35. After one end of the bracket body 35 is retracted inwardly, it is fixed to 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 is opened outward in an arc shape, two of which are linearly inclined outward, and the other elastic stop pressure rod 37 is linearly inclined outward. 7 is formed into a leaf shape after being opened outward in an arc shape. A traction line 51 is fixed to the other end of the connecting tube 36 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 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 passes through the other end of the stent guide tube 38 and is located outside the stent guide tube 38. The traction tube 39 is slidably connected to the stent guide tube 38.

[0060] like Figure 11 and Figure 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 and formed into 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 smoothly transitions through the arc structure to form a V-shaped protrusion 44.

[0061] like Figure 12As shown, the three proximal support rods 41 are respectively distributed at the five o'clock, seven o'clock and twelve o'clock positions, and 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 constitute a stop area 1 45, 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 constitute a stop area 2 46, and 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 constitute a stop area 3 47, wherein two elastic stop pressure rods 37 that are linearly and gradually inclined outward are respectively located in the stop area 1 45 and the stop area 2 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 that is arc-shaped and opens outward to form a leaf shape is located in the stop area 3 47.

[0062] like Figure 10 and Figure 11 As shown, a fixing cap 48 is fixed to one end of the pulling wire 51 outside the pulling tube 39 , and the fixing cap 48 is fixedly connected to the end of the pulling tube 39 .

[0063] The present invention also provides an operating method of a stent system for treating prostatic urinary tract stenosis, comprising the following steps:

[0064] Step 1: insert the obturator 30 into the sheath 5 through the assembly port 6 until the obturator 30 and the assembly port 6 are firmly fitted with each other, and then insert the obturator 30 into the human body through the head 34;

[0065] Step 2: Insert the traction tube 39 into the stent guide tube 38 through the end with the 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 this time, the end of the traction tube 39 with the fixing cap 48 is located outside the stent guide tube 38.

[0066] Step 3: Remove 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;

[0067] 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;

[0068] Step 5: Pull out 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;

[0069] 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 to make the stent body 35 in the ideal position;

[0070] Step 7: Slowly pull the traction tube 39 outward to retract the stent body 35 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 hold the two sides of the prostate wall apart.

[0071] 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;

[0072] Step nine, sequentially withdraw the urethroscope body 3 and the sheath 5, leaving the bracket body 35 and the elastic stop rod 37 inside the body, and partially exposing the traction wire 51 outside the body;

[0073] Step 10: After one week, remove the bracket body 35 and the elastic stop pressure rod 37.

[0074] like Figure 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 to remove the stent body 35 and the elastic stop pressure rod 37.

[0075] In the above steps, because the tip of the sheath tube 5 is relatively sharp, direct insertion into the human body could cause damage. Therefore, it is inserted through the curved tip 34 of the obturator 30 to minimize damage. When installing the obturator 30, the second positioning plug 33 is inserted into the assembly opening 6. This ensures an interference fit between the second positioning plug 33 and the end of the assembly opening 6 proximal to the sheath tube 5. The second step surface 13 is restrained on the first step surface 8, and the protruding shaft 15 is engaged in the corresponding retaining groove 14 to prevent radial deflection and improve the positioning effect of the obturator 30.

[0076] When installing the bridge tube 2, insert the positioning plug 12 into the assembly port 6 so that the positioning plug 12 is interference fit with the end of the assembly port 6 close to the sheath tube 5. At the same time, the step surface 2 13 is limited to the step surface 1 8, and the protruding shaft 15 is inserted into the corresponding slot 14 to prevent radial deflection, thereby improving the positioning effect of the bridge tube 2.

[0077] 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. 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 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. The operation is simple.

Claims

1. A stent system for treating prostatic urinary tract stenosis, characterized in that: The invention comprises a main body (1), a bridge tube (2), a urethroscope 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 port (6) respectively matching the bridge tube (2) and the obturator (30), the assembly port (6) is communicated with the inside 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 inside of the bridge tube (2) and is detachably connected to the bridge tube (2), the outside of the bridge tube (2) is provided with a socket (7) matching the bracket assembly (4), 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 bracket assembly (4) passes through the socket (7) and is located on the side of the bridge tube (2), and 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); during operation, the obturator is first inserted into the sheath tube (5), and then inserted into the human body through the obturator. When one end of the sheath tube (5) is sent to the corresponding position of the human body, the obturator is pulled out; the bracket assembly (4) is prepared, and the bracket assembly (4) is inserted into the sheath tube (5) so that the corresponding part is sent into the human body; then the bridge tube (2) is installed, and after the bridge tube (2) is matched with the assembly port (6), the bracket assembly (4) is inserted into the socket (7) to be limited. At the same time, the urethroscope body (3) is matched with the bridge tube (2), so that the urethroscope body (3) is inserted into the sheath tube (5) to observe the partial position of the bracket assembly (4) in the human body, and the position of the bracket assembly (4) can be adjusted at the same time.

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 away from the sheath tube (5). The diameter of the assembly opening (6) close to the sheath tube (5) is smaller than the diameter of the assembly opening (6) away from the sheath tube (5). The side wall of the assembly opening (6) close to the sheath tube (5) is inclined and its diameter 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). 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) matched with 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 located in the sheath (5); the mounting seat (10) is provided with a locking mechanism (11) matched with the urethroscope body (3); the urethroscope body (3) is fixedly connected to the sheath (5) and the main body (1) in sequence; the locking mechanism (11) matched with the urethroscope body (3) is provided on the mounting seat (10); the urethroscope body (3) is fixedly connected to the sheath (5) and the main body (1) in sequence; the locking mechanism (11) matched with ... The 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). The other end of the tube body (9) is provided 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 (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 assembly port (6) is provided with a plurality of slots (14) at one end away from the sheath (5). The side wall of the positioning plug (12) is provided with a plurality of protruding shafts (15) matching the slots (14) one by one.

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 (16), one end of which is an eyepiece end (17), and the other end of which is connected to a sheath (18) and a locking shaft (19) matching the locking mechanism (11), respectively. The sheath (18) passes through the tube (9) and the main body (1) in sequence and is located in the sheath tube (5). The locking shaft (19) is located on the side of the sheath (18) and is fixedly connected to the handle (16).

6. A stent system for treating prostatic urinary tract stenosis according to claim 5, characterized in that: The locking mechanism (11) includes a locking pin (20) perpendicular to the lock shaft (19), a matching groove (21) matching 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 open end of the matching groove (21) and is located outside the matching groove (21), the bottom side of the locking pin (20) is provided with a U-shaped groove (22) passing through the front and back, a lock tongue (23) is fixed on one side of the U-shaped groove (22), and a locking area (24) is formed between the other side of the U-shaped groove (22) and the lock tongue (23) for facilitating the penetration of the lock shaft (19), 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), 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 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 the rectangular groove (28) is threadedly connected to the mounting seat (10).

7. The stent system for treating prostatic urinary tract stenosis according to claim 2, wherein: The obturator (30) includes a second handle (31) and an insertion shaft (32) that matches the inside of the sheath tube (5), one end of the insertion shaft (32) is provided with a second positioning plug (33), the insertion shaft (32) is fixedly connected to the second handle (31) through 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) through 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), and the head (34) is located outside the other end of the sheath tube (5).

8. The 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) that matches the first step surface (8), and the end of the assembly port (6) away from the sheath tube (5) is provided with a plurality of slots (14), and the side wall of the second positioning plug (33) is protruding and fixed with a plurality of convex shafts (15) that match the slots (14) one by one.

9. The stent system for treating prostatic urinary tract stenosis according to claim 1, wherein: 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) matched with 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 inward, 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) is opened outward in an arc shape, wherein two elastic stop pressure rods (37) are linearly inclined outward, and the other elastic stop pressure rod (37) is opened outward in an arc shape. After that, it forms 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 to the inside of the stent guide tube (38). The stent body (35) and the elastic stop pressure rod (37) can both 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) passes through the other end of the stent guide tube (38) and is located outside the stent guide tube (38). The traction tube (39) is slidably connected to the stent guide tube (38).

10. The stent system for treating prostatic urinary tract stenosis according to claim 9, characterized in that: The stent body (35) includes 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) and forms an integral body, and the middle support rod (42) is fixedly connected to one end of the corresponding middle support rod (42). ) 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 into 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. The 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. 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 form a stop zone one (45), 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 form a stop zone two (46), and 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 form a stop zone three (47). Two elastic stop pressure rods (37) that are linearly and gradually inclined 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). The other elastic stop pressure rod (37) that is arc-shaped and opens outward to form a leaf shape is located in the stop zone three (47).

12. The stent system for treating prostatic urinary tract stenosis according to claim 9, wherein: 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).

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