Stent tube for skin stoma of ureter
By designing a ureterocutaneous stent tube and adopting a structure of drainage catheter and fixation, the problems of ureteral obstruction and hydronephrosis were solved, achieving smooth urine drainage and reducing complications, and simplifying the operation procedure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIHAI WEIBO MEDICAL TECH CO LTD
- Filing Date
- 2025-04-03
- Publication Date
- 2026-04-14
AI Technical Summary
In current ureterocutaneous stent placement procedures, the ureter is easily compressed by abdominal muscles and fat, leading to poor urine drainage. Furthermore, long-term indwelling ureteral stents are prone to blockage, resulting in complications such as hydronephrosis and pyelonephritis.
A stent tube for ureterodermal stoma has been designed, including a drainage catheter and a connecting part. The drainage catheter has a drainage channel inside, and the fixing part is deformable and fixed inside the ureter. Two adjacent drainage ports are provided on the abdominal wall. The drainage groove connects the abdominal wall and the drainage hole. The design of the drainage groove and the drainage hole allows urine to drain smoothly and avoids it from going deep into the renal pelvis.
It solves the problem of ureteral obstruction, reduces the risk of hydronephrosis and pyelonephritis, and is simple to operate, reducing the workload of patients and medical staff.
Smart Images
Figure CN224112855U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical device technology, specifically a stent tube for ureterodermal stoma. Background Technology
[0002] Bladder cancer is a very common malignant tumor of the urinary system. Invasive bladder cancer usually requires the removal of the entire bladder, surrounding tissues, and pelvic lymph nodes. Urinary diversion after cystectomy mainly involves the following methods: orthotopic neobladder, ileal access, and ureterocutaneous stoma. Among these, ureterocutaneous stoma is relatively simpler than ileal access, as it does not require intestinal resection; the freed ureter is directly connected to the abdominal wall to create a stoma. The incidence of intestinal and urinary leakage complications is much lower with orthotopic neobladder and ileal access, but the incidence of stoma stricture and urinary tract infection is higher.
[0003] Ureterostomy is further divided into "bilateral ureterostomy" and "unilateral ureterostomy." In the latter, "unilateral ureterostomy" involves pulling the left and right ureters to the abdominal wall stoma location, merging them, and then longitudinally incising the distal ends of the two ureters for approximately 6cm. A 3.5-4cm side-to-side anastomosis is performed, leaving the distal 2-2.5cm sutured and fixed to the skin stoma. The anastomosis between the ureteral distal ends and the skin is achieved using a double "V"-shaped skin flap inserted between the two ureteral flaps (e.g.,...). Figure 5 This procedure is relatively simple, with short operation time, minimal trauma, and few external stomas. However, because the delicate ureter is easily compressed by abdominal muscles and fat when passing through the abdominal wall, it can lead to poor urine drainage and subsequently hydronephrosis. Additionally, the blood supply to the distal ureter and abdominal skin is relatively poor, making anastomotic stenosis prone to occur after anastomosis. Therefore, a single-J ureteral stent is used for a period of time post-surgery, or even for life. One end is placed in the renal pelvis of the left and right kidneys, while the other end is placed externally to drain urine (e.g., Figure 5 Because the tip of a long-term indwelling ureteral stent is located inside the renal pelvis, and the stent tube is thin, the longer its course, the more likely it is to become blocked, which can easily lead to hydronephrosis and pyelonephritis. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this utility model provides a ureterocutaneous stent tube and its usage method, which has a simple structure, is easy to use, and does not require fixation through the renal pelvis, thus solving the problems mentioned in the background art.
[0005] This utility model provides the following technical solution: a ureterodermal stent tube, comprising a drainage conduit and a connecting part, wherein the drainage conduit is provided with a drainage channel for guiding urine in the ureter into the interior of the ureterodermal stent tube, thereby draining it out of the body through the stent, the drainage conduit comprising an intermediate tube body and a fixing part, the intermediate tube body comprising a first tube body and a second tube body, the external ends of the first tube body and the second tube body being connected by the connecting part, the fixing part being deformable, the fixing part extending radially outward in its natural state, and the connecting part being provided with a drainage groove for guiding urine out of the body.
[0006] The fixation part is located inside the ureter, and two drainage ports are provided on the abdominal wall. The first tube and the second tube are respectively located in the two drainage ports on the abdominal wall. The cavity inside the drainage catheter allows the inner core to pass through the middle tube from the connection part to the fixation part.
[0007] The two drainage ports on the abdominal wall are adjacent and located on the same side of the abdominal wall. The size interval between the two drainage ports is based on the size of the abdominal stoma base plate, and the size interval is no more than 5 cm. The distal end of the fixing part is a reduced-shape guide tip. The distal end face of the guide tip is provided with a guide hole, which is part of the guide channel. The inner core is a push tube and a guide wire. The present invention has found in clinical practice that the reason why ureterostomy is prone to obstruction is usually because the ureter is subjected to lateral pressure from the muscles as it passes through the abdominal wall. Therefore, the ureteral passage in the abdominal cavity is not easily compressed. Supporting only the segment passing through the abdominal wall can solve most ureteral obstruction problems and can avoid retrograde infection of the renal pelvis. Only when the two ureters are anastomosed through the abdominal wall on the same side, with two drainage ports within a 5 cm range, can effective support for the abdominal wall and ureterostomy be guaranteed. The anastomosis of the abdominal wall and ureter (i.e., supporting the ureteral segment passing through the abdominal wall) is effective and can solve most ureteral obstruction problems.
[0008] The guide groove is located at the proximal end of the connecting part, which includes a connecting horizontal part and a connecting bend. The two ends of the connecting horizontal part are respectively connected to the connecting bend, and the connecting bend connects to the proximal end of the intermediate tube body.
[0009] The flow guide channel includes a flow guide transverse channel located in the connecting transverse section. The flow guide transverse channel is a transverse through channel in the direction of the proximal end of the connecting transverse section. The flow guide bend is located near the proximal end of the connecting bend. The distal outer cut of the flow guide bend is located at and after the critical point of the turning point of the connecting bend, that is, at and after the critical point of the change of liquid flow direction. The flow guide channel allows the liquid in the flow guide tube to pass through the flow guide bend, so that the liquid is discharged in a direction parallel to the axis of the flow guide tube or in a direction closer to the axis.
[0010] The distance between the axes at the distal ends of the first and second tubes is less than or equal to the distance between the proximal end of the intermediate tube and the connecting part. Because this surgery requires freeing the ureters on both sides of the body, if the distance between the axes of the first and second tubes increases from proximal to distal, it will cause the required length of one side of the ureter (i.e., the ureter furthest from the drainage opening on the abdominal wall) to increase. Furthermore, the distal end of one of the intermediate tubes will tilt downwards. Combined with the ureter's own weight and considering the fluid within the ureter, a small amount of fluid may not easily flow through the ureter to the drainage catheter, potentially leaving a small amount of fluid in the ureter. This can easily lead to long-term contamination of the ureter due to prolonged contact with the retained urine.
[0011] The fixing part includes an inlet tip and a shaping structure connected to the proximal end of the inlet tip. The shaping structure consists of multiple strips evenly distributed along the axis of the inlet tip. The proximal end of each strip is connected to the distal opening of a corresponding intermediate tube. In its natural state, the cross-section of the strip is V-shaped. There are positions in the guide hole at the end of the inlet tip where the diameter of the guide hole is smaller than the diameter of the guide wire. The diameter of the guide hole at the inlet tip can be a single hole, and it can be a tapered guide hole. The guide channel includes the drainage hole provided on the inlet tip, the gap formed between the multiple strips, and the cavity inside the tube.
[0012] Optionally, the fixing part is a circular fixed section. The drainage channel includes drainage holes arranged alternately on the drainage conduit, drainage holes opened at the distal end of the drainage tip, and cavities inside the tube. The drainage channels are interconnected and used to guide urine into the stent for drainage out of the body. The drainage holes are located on the fixing part and part of the intermediate tube.
[0013] Optionally, the fixing part has a spiral structure. The drainage channel includes drainage holes staggered on the drainage catheter, a drainage hole opened at the distal end of the drainage tip, and a cavity inside the tube. The drainage channels are interconnected and used to guide urine into the stent for drainage. The drainage holes are located on the fixing part and part of the intermediate tube.
[0014] A ureterocutaneous stent tube is provided, at least the fixation part of which is made of TPU material. Contrast agent is added to the TPU material to facilitate observation of the insertion through equipment during implantation.
[0015] Compared with the prior art, this utility model has the following beneficial effects: a ureterodermal stent tube with both ends implanted into the patient's two ureters, and a ureterodermal stent tube clamped in the ureter, with drainage channels draining out of the body. This structure of the stent does not need to penetrate deep into the patient's renal pelvis, reducing patient discomfort; it also plays a protective role against ureteral obstruction caused by the abdominal wall; at the same time, it is simple to operate and easy to replace, reducing the workload of patients and medical staff. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of a ureterocutaneous stent tube according to a specific embodiment 1 of the present invention;
[0017] Figure 2 This is a schematic diagram of the main view and cross-sectional view of a stent tube for ureterocutaneous stoma according to a specific embodiment of the present invention.
[0018] Figure 3 This is a side view of a stent tube for ureterocutaneous stoma according to a specific embodiment of the present invention;
[0019] Figure 4 This is a schematic diagram of a stent tube implantation structure for ureterocutaneous stoma according to a specific embodiment 1 of this utility model;
[0020] Figure 5 A schematic diagram of single-J stent implantation in existing bilateral ureterostomy techniques;
[0021] Figure 6 This is a three-dimensional structural diagram of a ureterocutaneous stent tube according to a specific embodiment 2 of the present invention;
[0022] Figure 7 This is a schematic cross-sectional view of a stent tube for ureterocutaneous stoma according to a specific embodiment 2 of the present invention;
[0023] Figure 8 This is a schematic diagram of a stent tube implantation structure for ureterocutaneous stoma according to a specific embodiment 2 of this utility model;
[0024] Figure 9 This is a three-dimensional structural diagram of a ureterocutaneous stent tube according to a specific embodiment 3 of the present invention;
[0025] Figure 10 This is a side view of a stent tube for ureterodermal stoma according to a specific embodiment 3 of the present invention.
[0026] In the diagram: 1. Guide tube; 11. Fixing part; 12. Intermediate tube body; 13. Guide hole; 14. Drain hole;
[0027] 112. Tip introduction; 113. Shaping structure; 114. Circular shaping section; 115. Spiral structure;
[0028] The first tube body; 122. The second tube body;
[0029] 2. Connecting part; 21. Connecting bend; 22. Connecting cross section; 23. Guide channel; 231. Guide bend channel; 232. Guide cross channel. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Traditional ureteral stents, with one end inserted into the renal pelvis and the other end placed outside the stoma, are prone to complications such as hydronephrosis and pyelonephritis. In bilateral ureterostomy with unilateral stoma, the patient has only one stoma in the abdomen, making it difficult to implant two single-J ureteral stents due to the smaller outlet size.
[0032] Specific Implementation Example 1: Please refer to Figure 1-4 .like Figure 1 , Figure 2 A ureterodermal stent tube includes two drainage catheters 1 and a connecting part 2. The tube body (including the drainage catheters 1 and the connecting part 2) of the ureterodermal stent tube is molded from TPU material, which has good elasticity and support performance, and is conducive to the drainage of urine from the patient. The drainage catheters 1 are provided with drainage channels for guiding urine in the ureter into the interior of the ureterodermal stent tube, so as to drain it out of the body through the stent. The drainage catheters 1 include an intermediate tube body 12 and a fixing part 11. The fixing part 11 is located at the distal end of the intermediate tube body 12. The intermediate tube body 12 is divided into a first tube body 121 and a second tube body 122. The first tube body 121 and the second tube body 122 are not on the same drainage catheter 1. The external ends of the first tube body 121 and the second tube body 122 are connected by the connecting part 2. The fixing part 11 can deform and extends radially outward in its natural state.
[0033] The fixing part includes an inlet tip and a shaping structure connected to the proximal end of the inlet tip. The shaping structure 112 consists of multiple strips evenly distributed along the axis of the inlet tip 111. The proximal end of each strip is connected to the distal opening of the corresponding intermediate tube. In its natural state, the cross-section of the strip is V-shaped. There are positions in the guide holes 13 at the end of the inlet tip 111 where the diameter of the guide hole 13 is smaller than the diameter of the guide wire. The guide holes 13 at the end of the inlet tip 111 penetrate the inlet tip 111. The diameter of the guide hole 13 on the end face of the inlet tip 111 can be a single value, or it can be a variable value of the tapered guide hole 13.
[0034] The distal end of the fixing part 11 is a reduced-size inlet tip 111. The distal dimension of the inlet tip 111 is smaller than the proximal dimension. In this specific embodiment, the inlet tip 111 has a truncated cone cross-section. The distal end face of the inlet tip 111 is also provided with a drainage hole 13. The axial direction of the drainage hole on the distal end face of the inlet tip 111 is parallel to or coincides with the axial direction of the inlet tip. In this specific embodiment, they coincide. The inner diameter of the drainage hole 13 on the distal end face of the inlet tip 111 is not limited to a single fixed size; it can also be a variable inner diameter, such as the drainage hole 13 also being truncated cone-shaped. The inlet tip 111 serves two purposes: first, to facilitate movement within the ureter; and second, because some users have relatively small ureteral diameters, such as children, the through-hole 13 on the inlet tip 111 can guide urine from the ureter into the stent of this invention, thereby draining it out of the body. This prevents the situation where, in the prior art, the side opening of the tube body is easily blocked when the ureteral diameter is small. The drainage hole 14 on the outer wall of the drainage catheter 1 is easily blocked by the catheter wall. The difference in diameter along the axial direction at the insertion tip 111 prevents this from happening. Thirdly, when removing the ureterotomy stent, it prevents the drainage holes 14 on the outer wall of other drainage catheters 1 (except for the drainage tip 111) from being blocked by the ureteral wall, thus preventing air from entering and making removal of the ureterotomy stent difficult. The drainage hole 13 at the distal end of the insertion tip 111 also enhances the above effects.
[0035] The guide tip 111 is designed to facilitate movement within the ureter and to cooperate with the inner core. When the inner core (guidewire and push tube) reaches the distal end or interior of the guide tip 111, the inner core cannot continue to pass through the guide tip 111 due to the structural limitations of the guide tip 111. This pushes the guide tip 111 to move distally together, thereby causing the shaping structure 112 (i.e., multiple strips) to be axially extended and the shaping structure to contract radially.
[0036] The fixed structure 112 (i.e., multiple strips) has a V-shaped or near-V-shaped longitudinal cross-section. At least the tips of the V-shapes are not connected between the strips; the roots may or may not be connected. The unconnected portions will naturally separate from each other. Figure 1 and Figure 2 As shown, there are gaps between adjacent bands, which ensure that even if the ureter has a small diameter, urine can flow from the gaps between the bands into the subsequent intermediate tube 12. The shaping structure 112 can guide a large enough volume of liquid, and the guide hole 13 at the tip 111 allows urine to enter the space surrounded by the bands through the guide hole 13 at the front end, and then flow into the subsequent intermediate tube 12.
[0037] When the stent tube for ureterotomy is removed, this invention will not cause the drainage channel to be blocked by the ureteral tube wall, preventing air from entering and thus avoiding the problem of difficulty in removing the stent tube for ureterotomy.
[0038] The connecting part 2 is provided with a guide groove 23. The liquid in the ureter can enter the intermediate tube 12 from the fixing part 11 (the guide hole 13 at the end and / or the gap between the multiple strips of the fixing structure 112) and then enter the connecting part 2. Finally, the urine is drained out of the body through the guide groove 23. It can be connected to a urine bag or other devices. If it is a urine bag, the connecting part 2 can be inserted into the opening of the urine bag. The urine is discharged in the urine bag through the guide groove 23 of the connecting part 2 and collected by the urine bag. The fit between the urine bag and the abdominal wall is the existing structure. It can be connected to the base plate patch. One side is attached to the area around the abdominal wall incision to act as a barrier to protect the skin around the abdominal wall stoma and prevent contact with urine. The other side of the base plate patch is connected to the urine bag. Traditional single-J tubes have a long lead-out distance, and the external end of the single-J tube is prone to tangling, taking up space and being difficult to manage. The design of this application connects the first tube body and the second tube body, and the drainage channel is closer to the abdominal wall. The urine outlet of the drainage channel is close to the abdominal wall, saving space and making it easier to manage.
[0039] The fixing part 11 is located inside the ureter, and there are two drainage ports on the abdominal wall. The two drainage ports are adjacent to each other and located on the same side of the abdominal wall. The size interval between the two drainage ports is based on the size of the abdominal stoma base plate, and the size interval is no more than 5cm. The first tube body 121 and the second tube body 122 are respectively matched with the two drainage ports on the abdominal wall, that is, the two drainage catheters 1 are respectively inserted into the two drainage ports and continue to be inserted into the ureter connected to each drainage port.
[0040] The cavity inside the drainage conduit 1 allows the inner core to pass through the intermediate tube body from the connection part to the fixing part. The inner core consists of a push tube and a guide wire.
[0041] The guide groove 23 is located at the proximal end of the connecting part 2. The connecting part 2 includes a connecting horizontal part 22 and a connecting bend 21. The two ends of the connecting horizontal part 22 are respectively connected to the connecting bend 21, and the proximal end of the intermediate tube body 12 is connected through the connecting bend 21.
[0042] The flow guide trough 23 includes a flow guide transverse groove 232 located in the connecting transverse portion 22. The flow guide transverse groove 232 is a transverse through groove in the direction of the proximal end of the connecting transverse portion 22. The flow guide bend 231 is in the direction of the proximal end of the connecting bend 21. The distal outer cut of the flow guide bend 231 is located at and after the critical point of the turning point of the connecting bend 21, that is, at and after the critical point of the change of liquid flow direction. The liquid in the flow guide duct 1 is allowed to pass through the flow guide bend 231, so that the liquid is discharged in a direction parallel to the axis of the flow guide duct 1 or in a direction closer to the axis.
[0043] The distance between the axes at the distal ends of the first tube 121 and the second tube 122 is less than or equal to the distance between the proximal end of the intermediate tube 12 and the connection part 2. Because this surgery requires freeing the ureters on both sides of the body, if the distance between the axes of the first and second tubes increases from the proximal end to the distal end, it will cause the required length of one side of the ureter (that is, the ureter away from the drainage port on the abdominal wall) to increase. In addition, the distal end of one of the intermediate tubes will tilt downward. Considering the weight of the ureter and the fluid in the ureter, a small amount of fluid will not easily flow through the ureter to the drainage catheter, and a small amount of fluid may remain in the ureter. This can easily cause the ureter to be contaminated by long-term contact with the retained urine.
[0044] The ends of the left and right ureters are directly anastomosed to the abdominal wall on the same side, forming two adjacent drainage ports on the same side of the abdominal wall, so that each ureter can be directly drained. This design solves the problem that patients with bilateral ureterostomy have only one stoma in their abdomen, which is not conducive to the implantation of two ureteral single J stents due to the small outlet size. It can also promptly detect lesions in one kidney and / or ureter, solving the problem that existing technologies cannot determine which side is affected.
[0045] A method for using a stent tube for ureterocutaneous ostomy:
[0046] One drainage stent corresponds to two adjacent tubes. In practical application, the tubes refer to the left and right ureters. The two drainage catheters contained in a ureterocutaneous stent tube correspond to the two adjacent ureters on the left and right sides, respectively. In practical application, after the left and right ureters are pulled to the abdominal wall stoma position, the ends of the left and right ureters are directly anastomosed to the abdominal wall on the same side, forming two adjacent drainage ports on the same side of the abdominal wall. In this way, each ureter can be directly drained. This design solves the problem that patients with bilateral ureterostomy have only one stoma in their abdomen, and the small outlet size is not conducive to stent implantation when implanting two ureteral single J stents.
[0047] The proximal end of a guidewire is inserted into the anastomosed ureter from a drainage port;
[0048] The distal end of a guidewire passes sequentially through the corresponding fixing part 11, intermediate tube 12, and connecting part 2, and exits from the guide groove 23 of the connecting part 2. A push tube is sleeved on the outside of the corresponding guidewire, pushing the push tube into the ureterodermal stent tube. Under the action of the push tube, the fixing part 11 deforms and extends in the axial direction, and then the top guide tip 111 passes through the tube and enters the ureter from the abdominal wall, so that the ureterodermal stent tube penetrates into one side of the ureter. The guidewire and push tube are pulled out, and the multiple strips of the shaping structure 112 of the fixing part 11 return to the free state from the stretched state. The distal end of the ureterodermal stent tube is stuck in the ureter, and the operation is repeated for the other tube.
[0049] In practical application, a push tube and guide wire (not shown in the accompanying drawings, but this does not affect the understanding of the technical solution of this utility model by those skilled in the art) are used to pass through the bottom drainage groove 23 and into the drainage hole 13 on one side. The shaping section (i.e., the shaping structure 112 in this embodiment) in the end fixing part 11 is straightened. Then, the tip 111 is inserted through the abdominal wall and ureter, so that the tube body of a ureterodermal stent tube is inserted into the ureter on one side. Then, the guide wire is pulled out, so that the multiple strips of the shaping structure 112 return to their original shape from the stretched state. One end of the ureterodermal stent tube is stuck in the ureter. The operation is repeated on the other side, and the drainage catheter at the other end is inserted into the other ureter from another drainage port. When in use, the urine produced by the kidneys flows through the ureter into the guiding catheter 1, through the guiding hole 13 at the tip 111 and the shaping structure 112 composed of multiple strips, into the guiding hole 13 (that is, the lumen of the intermediate tube) in the middle tube body 12, flows to the bottom guiding groove 23, and is discharged from the body.
[0050] This utility model discloses a ureterocutaneous stent tube, with both ends implanted into the patient's bilateral ureters, and a central opening for drainage. Figure 4 As shown. This utility model provides a ureterocutaneous stent tube that does not need to be inserted into the patient's renal pelvis, thus avoiding the risk of kidney infection; at the same time, the thick abdominal wall protects against ureteral obstruction caused by the relatively soft and fragile ureter; it is also simple to operate and easy to replace, reducing the workload of patients and medical staff. Specific Implementation
[0051] The difference between this specific embodiment and specific embodiment 1 is that: Figures 6-8 As shown, in this specific embodiment, the circular shaping segment 113 of the fixing part 11 is as follows: Figure 6 and Figure 7 As shown, the circular shaping section 113 is a circular tube with an incompletely closed opening. The incompletely closed opening means that the far end and the near end of the circular shaping section are not connected to form a complete circle. This is to ensure that the circular shaping section can have a natural state and straighten deformation.
[0052] The fixing part 11 is in a deformable state. In its natural state, it will become larger. When an external force is applied, it will straighten. Straightening is an ideal state, that is, the circular shaping section 113 of the fixing part will extend or lengthen in the axial direction, and the radial resistance will decrease.
[0053] The drainage channel includes a drainage hole 13 at the inlet tip 111, multiple drainage holes 14, and a lumen of the intermediate tube. These drainage channels are interconnected and used to guide urine into the stent for drainage. Drainage holes 14 are located on the fixing part 11 and a portion of the intermediate tube 12. The fixing part 11 also needs to have drainage holes 14, while only a portion of the intermediate tube 12 has drainage holes 14. This is because the intermediate tube 12 is near its proximal end and protrudes outside the body; having drainage holes 14 in this part makes it easier for urine to drain from the inlet of the urine collection device, and improper operation could easily contaminate adjacent parts. The drainage holes 14 are staggered on the drainage catheter 1, either in a forward / backward or spiral pattern, to allow urine in the ureter to flow from the drainage holes 14 into the ureteroscopic stent tube, from which it is drained. The cavity inside the drainage catheter 1 allows the inner core (which consists of a push tube and guidewire) to pass through the intermediate tube from the connecting part to the fixing part.
[0054] The guide tip 111 serves several purposes: first, it facilitates movement within the ureter; second, although the drainage catheter 1 (i.e., the fixing part 11 and the intermediate tube body 12) has drainage holes 14 on both sides of its outer wall, some users, such as children, have smaller ureteral diameters, making the drainage holes 14 on the outer wall of the drainage catheter 1 prone to blockage by the tube wall. The guide tip 111, due to its increased diameter in the axial direction, prevents this from happening; and third, when removing the ureterotomy stent, it prevents the drainage holes 14 on the outer wall of other drainage catheters 1 (excluding the guide tip 111) from being blocked by the ureteral wall, thus preventing air from entering and making removal of the ureterotomy stent difficult. The drainage hole 13 on the distal end face of the guide tip 111 further enhances these effects.
[0055] The connecting part 2 is provided with a guide groove 23. The liquid in the ureter can enter the intermediate tube 12 from the fixed part 11 (the guide hole 13 at the end and / or the drainage hole 14 on both sides of the tube wall of the fixed part) or the drainage hole 14 of the intermediate tube 12, and then enter the connecting part 2. Finally, the urine is guided out of the body through the guide groove 23.
[0056] In specific embodiment 2, a ureterocutaneous stent tube is used as follows:
[0057] One drainage stent corresponds to two adjacent tubes. In practical application, the tubes refer to the left and right ureters. The two drainage catheters contained in a ureterocutaneous stent tube correspond to the two adjacent ureters on the left and right sides, respectively. In practical application, after the left and right ureters are pulled to the abdominal wall stoma position, the ends of the left and right ureters are directly anastomosed to the abdominal wall on the same side, forming two adjacent drainage ports on the same side of the abdominal wall. In this way, each ureter can be directly drained. This design solves the problem that patients with bilateral ureterostomy have only one stoma in the abdomen, and the small outlet size is not conducive to stent implantation when implanting two ureteral single J stents. It can also promptly detect lesions of one kidney and / or ureter, solving the problem that it is impossible to determine which side is affected in the existing technology.
[0058] The proximal end of a guidewire is inserted into the anastomosed ureter from a drainage port;
[0059] The distal end of a guidewire passes sequentially through the corresponding fixing part 11, intermediate tube 12, and connecting part 2, and exits from the guide groove 23 of the connecting part 2. A push tube is sleeved on the outside of the corresponding guidewire, pushing the push tube into the ureterodermal stent tube. Under the action of the push tube, the fixing part 11 deforms and extends in the axial direction, and then the top guide tip 111 passes through the tube and enters the ureter from the abdominal wall, so that the ureterodermal stent tube penetrates into one side of the ureter. The guidewire and push tube are pulled out, and the circular shaping section 113 of the fixing part 11 returns to its free state. The distal end of the ureterodermal stent tube is stuck in the ureter. The operation is repeated for the other tube.
[0060] In practical application, a push tube and guide wire (not shown in the accompanying drawings, but this does not affect the understanding of the technical solution of this utility model by those skilled in the art) are used. The tube passes through the bottom drainage groove 23 and into the drainage hole 13 on one side. The shaping section (i.e., the circular shaping section 113 in this embodiment) in the end fixing part 11 is straightened. Then, the tip 111 is inserted through the abdominal wall and ureter, so that the tube body of a ureterotomy stent tube is inserted into the ureter on one side. Then, the guide wire is pulled out, and the circular shaping section 113 is folded back. Under the action of the tube body's elasticity, one end of the ureterotomy stent tube is stuck in the ureter. The operation is repeated on the other side, and the drainage catheter at the other end is inserted into the other ureter from another drainage port. In use, the urine produced by the kidney flows through the ureter into the drainage holes 13 at both ends of the drainage catheter 1 and the drainage holes 14 on both sides, and flows into the drainage hole 13 in the middle tube body 12, flows to the bottom drainage groove 23, and is discharged from the body.
[0061] This utility model discloses a ureterocutaneous stent tube, with both ends implanted into the patient's bilateral ureters, and a central opening for drainage. Figure 8As shown. This utility model provides a ureterocutaneous stent tube that does not need to be inserted into the patient's renal pelvis, thus avoiding the risk of kidney infection; it also provides protection against ureteral obstruction caused by the abdominal wall; at the same time, it is simple to operate, easy to replace, and reduces the workload of patients and medical staff.
[0062] Specific Embodiment 3: The difference between this specific embodiment and Specific Embodiment 2 is that the fixing part is a spiral structure 114. In its natural state, the distance between the distal and proximal ends of the spiral structure 114 should not be too large, either close together or with a small gap, to avoid excessive pressure on the inner wall of the ureter or long-term pressure damage to the ureter in its natural state. This structure can increase the depth of both ends penetrating the ureter and increase the strength of the insertion into the ureter, making it less likely for the ureteral stent tube to fall off.
[0063] The usage method is the same as in Specific Implementation Example 2.
[0064] Specific embodiment 4: The difference between this specific embodiment and specific embodiments 1, 2, or 3 is that: at least the fixing part 11 of this utility model uses TPU material. Contrast agent can be added to TPU material, which is beneficial for observing the insertion through the device during implantation. In addition, the material has good elasticity and good support performance, which is beneficial for the drainage of urine from the patient.
[0065] Specific Embodiment 5: The difference between this specific embodiment and Specific Embodiment 1, 2, or 3 is that: the ureterodermal stent tube of this utility model uses TPU material. This material can be added with contrast agent, which is beneficial for observing the insertion through the device during implantation. In addition, the material has good elasticity and good support performance, which is beneficial for the drainage of urine from the patient.
[0066] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A stent tube for ureterocutaneous stoma, characterized in that: The device includes a drainage conduit and a connecting part. The drainage conduit has a drainage channel and includes an intermediate tube body and a fixing part. The intermediate tube body includes a first tube body and a second tube body. The external ends of the first tube body and the second tube body are connected by the connecting part. The fixing part can be deformed and extends radially outward in its natural state. The connecting part has a drainage groove for guiding urine out of the body.
2. The ureterocutaneous stent tube according to claim 1, characterized in that: The fixation part is located inside the ureter, and two drainage ports are provided on the abdominal wall. The first tube and the second tube are respectively located in the two drainage ports on the abdominal wall. The cavity inside the drainage catheter allows the inner core to pass through the middle tube from the connection part to the fixation part.
3. The ureterocutaneous stent tube according to claim 1, characterized in that: The two drainage ports on the abdominal wall are adjacent and located on the same side of the abdominal wall. The size interval is based on the size of the abdominal stoma base plate. The distal end of the fixation part is a reduced-shape inlet tip. The distal end face of the inlet tip is provided with a drainage hole. The inner core is a push tube and a guide wire.
4. A ureterocutaneous stent tube according to claim 1, characterized in that: The guide groove is located at the proximal end of the connecting part, which includes a connecting horizontal part and a connecting bend. The two ends of the connecting horizontal part are respectively connected to the connecting bend, and the connecting bend connects to the proximal end of the intermediate tube body.
5. A ureterocutaneous stent tube according to claim 4, characterized in that: The flow guide channel includes a flow guide transverse channel located in the connecting transverse section. The flow guide transverse channel is a transverse through channel in the direction of the proximal end of the connecting transverse section. The flow guide bend is located near the proximal end of the connecting bend. The distal outer cut of the flow guide bend is located at and after the critical point of the turning point of the connecting bend, that is, at and after the critical point of the change of liquid flow direction. The liquid in the flow guide tube is allowed to pass through the flow guide bend, so that the liquid is discharged in a direction parallel to the axis of the flow guide tube or in a direction closer to the axis.
6. A ureterocutaneous stent tube according to claim 5, characterized in that: The distance between the axes at the distal ends of the first and second tubes is less than or equal to the distance between the proximal end of the intermediate tube and the connection point.
7. A ureterocutaneous stent tube according to claim 1, characterized in that: The fixing part includes an inlet tip and a shaping structure connected to the proximal end of the inlet tip. The shaping structure consists of multiple strips evenly distributed along the axis of the inlet tip. The proximal end of each strip is connected to the distal opening of the corresponding intermediate tube. In its natural state, the cross-section of the strip is V-shaped. There are positions in the guide hole at the end of the inlet tip where the diameter of the guide hole is smaller than the diameter of the guide wire. The guide channel includes the drainage hole provided on the inlet tip, the gap formed between the multiple strips, and the cavity inside the tube.
8. A ureterocutaneous stent tube according to claim 1, characterized in that: The fixing part is a circular fixed section, and the drainage channel includes drainage holes arranged alternately on the drainage conduit, drainage holes opened at the distal end of the drainage tip, and a cavity inside the tube. The drainage channels are interconnected and used to guide urine into the stent and drain it out of the body. The drainage holes are located on the fixing part and part of the intermediate tube.
9. A ureterocutaneous stent tube according to claim 1, characterized in that: The fixing part has a spiral structure, and the drainage channel includes drainage holes arranged alternately on the drainage conduit, drainage holes opened at the distal end of the drainage tip, and a cavity inside the tube. The drainage channels are interconnected and used to guide urine into the stent for discharge. The drainage holes are located on the fixing part and part of the intermediate tube.
10. A ureterocutaneous stent tube according to any one of claims 1-9, characterized in that: At least the fixation portion of a ureterocutaneous stent tube is made of TPU material, and a contrast agent is added to the TPU material to facilitate observation of the insertion process via equipment during implantation.