A convenient ureteral calculus postoperative stent taking-out device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHIJIAZHUANG PEOPLES HOSPITAL
- Filing Date
- 2026-06-24
- Publication Date
- 2026-08-04
AI Technical Summary
一方面，在直接取出输尿管支架时，由于支架与输尿管内壁可能存在粘连等情况，强行拉拽取出易对输尿管造成损伤，引发输尿管撕裂、出血等并发症，给患者带来额外痛苦，增加术后恢复难度与风险
该输尿管支架便捷取出装置中，其硅胶外管插入输尿管能保证外部操作，第一、第二硅胶气管与气嘴及医用气泵连接，通过控制供气抽气实现多种功能。环状气囊膨胀时利用凹槽推动牵拉臂带动镍钛刀片旋转，可切断输尿管支架，降低直接取出对输尿管拉拽损伤的风险。环形气囊与逗号形气囊组成的蠕动式运输组件，通过医用气泵依次对不同位置的第一硅胶气管供气抽气，实现间隙式收缩膨胀，能持续稳定地将切断后的支架从输尿管中分段取出，整个过程操作相对简便，减少了手术难度和患者痛苦，有助于提高手术效率和安全性，为输尿管结石术后支架取出提供了更有效的解决方案。
Smart Images
Figure CN122498967A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ureteral stent removal instruments, specifically to a convenient device for removing stents after ureteral stone surgery. Background Technology
[0002] In the field of ureteral stone surgery, postoperative ureteral stent removal is a crucial procedure. Traditional removal methods have several drawbacks. Firstly, direct removal of the ureteral stent can easily damage the ureter due to adhesions between the stent and the ureteral wall, leading to complications such as ureteral tearing and bleeding, causing additional pain for the patient and increasing the difficulty and risk of postoperative recovery. Secondly, some existing removal devices are limited in function and lack an effective stent-cutting mechanism, making it difficult to remove long or heavily adhered stents smoothly. Furthermore, the lack of a stable and effective power transmission method during stent transport prevents the segmented, continuous, and stable removal of the stent from the ureter, resulting in complex and inefficient procedures that negatively impact overall treatment outcomes and patient prognosis. Therefore, based on the above-mentioned points, those skilled in the art propose a solution for a convenient stent removal device after ureteral stone surgery. Summary of the Invention
[0003] In view of the deficiencies mentioned above in the background art, a technical solution is provided for a convenient device for removing stents after ureteral stone surgery.
[0004] It includes a silicone outer tube, in which multiple sets of peristaltic transport components are fixed at equal intervals, and a cutting component is provided at the middle section of the inner cavity of the silicone outer tube. A tracheal assembly connected to the peristaltic transport components and the cutting component is provided through the outer surface of the silicone outer tube. The air tube assembly includes several first silicone air tubes that are connected to the peristaltic transport assembly, and a second silicone air tube that is connected to the cutting assembly. The ends of the first and second silicone air tubes that are away from the outer silicone tube are fixed with air nozzles. Each of the peristaltic transport components includes an annular airbag, with 8-12 comma-shaped airbags fixedly connected in a ring array to the front end face of the annular airbag. Each of the comma-shaped airbags has 2-3 memory metal strips fixed on its front arc surface. The cutting assembly includes an annular airbag, 16-24 grooves arranged in a ring array on the outer surface of the annular airbag, and 16-24 connecting blocks arranged in a ring array fixed on the inner wall of the silicone outer tube. A rotating shaft is rotatably connected to the rear side wall of each connecting block. A nickel-titanium blade is fixedly connected to the outer surface of the rotating shaft. A traction arm that is coupled and adapted to the groove is fixed to the rear end of each rotating shaft.
[0005] In the above technical solution, preferably: the front section of the silicone outer tube is inserted into the ureter, and the rear section of the silicone outer tube is located outside the ureter. The front section of the silicone outer tube is provided with multiple through holes for the first silicone air tube and the second silicone air tube to pass through. The internal gaps of the through holes are all filled with sealant.
[0006] In the above technical solution, preferably: the sections of the first silicone air tube and the second silicone air tube located outside the silicone outer tube are both tightly fixed to the outer ring surface of the silicone outer tube by adhesive, and the ends of the first silicone air tube and the second silicone air tube away from the air nozzle respectively penetrate into the inner cavity of the annular air bag and the ring-shaped air bag.
[0007] In the above technical solution, preferably: the ends of the air nozzles away from the first and second silicone air tubes are connected to a medical air pump, and the medical air pump has multiple ports, each of which is equipped with a solenoid valve for controlling the supply or degassing of air into the first or second silicone air tube. The air supply sequence of the first and second silicone air tubes is as follows: the first silicone air tube at the front is supplied with air for 1 second to expand the peristaltic transport component, and then degassing it to make it contract. After the first silicone air tube at the front is degassed, air is supplied to the first silicone air tube at the rear for 1 second, and then degassing is performed. This achieves the intermittent contraction and expansion of the peristaltic transport component, which drives the ureteral stent to move backward.
[0008] In the above technical solution, preferably: the interiors of the annular airbag and the comma-shaped airbag are both hollow, the cross-section of the comma-shaped airbag is comma-shaped, and the front end of the comma-shaped airbag is tilted forward. The comma-shaped airbag is kept tilted forward by a memory metal strip. After the first silicone tube inflates the annular airbag to make the comma-shaped airbag expand, the front end of the comma-shaped airbag contracts backward, thereby driving the ureteral stent inside the silicone outer tube to move backward.
[0009] In the above technical solution, preferably, the front surface of the comma-shaped airbag is provided with folds that allow it to tilt forward.
[0010] In the above technical solution, preferably: a circular hole is provided on the rear end face of the annular airbag for the first silicone air tube to pass through, and the internal gap of the circular hole is filled with sealant.
[0011] In the above technical solution, preferably, the cutting edge of the nickel-titanium blade faces inward and is used to cut the ureteral stent by rotating and closing together, thereby facilitating the peristaltic transport component to transport and remove the cut ureteral stent, reducing the ureteral traction damage caused by direct removal.
[0012] In the above technical solution, preferably: a circular hole is provided on the rear end face of the annular airbag for the second silicone air tube to pass through, and the internal gap of the circular hole is filled with sealant.
[0013] In the above technical solution, preferably: the groove has a larger opening space than the size of the traction arm, and expands outward after the annular airbag is inflated and uses the groove to push the traction arm to rotate, thereby driving the nickel-titanium blades to rotate and close together to cut the ureteral stent, so that the stent can be removed in segments.
[0014] As can be seen from the above technical solution, the present invention provides a convenient stent removal device after ureteral stone surgery. Compared with the prior art, the present invention has the following beneficial effects: In this convenient ureteral stent removal device, the silicone outer tube is inserted into the ureter to ensure external operation. The first and second silicone air tubes are connected to the air nozzle and medical air pump, enabling multiple functions through controlled air supply and aspiration. When the annular balloon inflates, the groove pushes the traction arm to rotate the nickel-titanium blade, which can cut the ureteral stent, reducing the risk of ureteral traction damage from direct removal. The peristaltic transport component, composed of the annular and comma-shaped air tubes, uses the medical air pump to sequentially supply and aspirate air to different positions of the first silicone air tube, achieving intermittent contraction and expansion. This allows for the continuous and stable segmented removal of the cut stent from the ureter. The entire process is relatively simple, reducing surgical difficulty and patient discomfort, and helping to improve surgical efficiency and safety, providing a more effective solution for stent removal after ureteral stone surgery. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced and explained below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 A schematic diagram of the overall structure of a device for easy removal of a ureteral stent; Figure 2 Internal diagram of a device for easy removal of a ureteral stent; Figure 3 This is a schematic diagram of the tracheal assembly; Figure 4 This is a schematic diagram of a truncated component; Figure 5 This is a schematic diagram of a peristaltic transport component.
[0017] Appendix Figure 1 - Appendix Figure 5 The correspondence between the components is as follows: 1. Silicone outer tube; 2. Tracheal assembly; 2-1. First silicone tracheal tube; 2-2. Second silicone tracheal tube; 2-3. Air nozzle; 3. Peristaltic transport assembly; 3-1. Annular airbag; 3-2. Comma-shaped airbag; 3-3. Memory metal strip; 4. Cut-off assembly; 4-1. Annular airbag; 4-2. Groove; 4-3. Traction arm; 4-4. Rotating shaft; 4-5. Connecting block; 4-6. Nickel-titanium blade. Detailed Implementation
[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In order to provide a clearer explanation and description of the technical solutions and implementation methods of the present invention, the following describes specific embodiments that implement the preferred technical solutions of the present invention.
[0019] Example 1: In practical application, the front section of the silicone outer tube 1 is first inserted into the ureter, ensuring that the rear section of the silicone outer tube 1 is located outside the ureter. The gap inside the through hole on the front section of the silicone outer tube 1 has been filled with sealant. The sections of the first silicone air tube 2-1 and the second silicone air tube 2-2 located outside the silicone outer tube 1 are tightly fixed to the outer surface of the silicone outer tube 1 with adhesive. The ends of the first silicone air tube 2-1 and the second silicone air tube 2-2 away from the air nozzle 2-3 respectively penetrate into the inner cavity of the annular air bag 3-1 and the ring-shaped air bag 4-1. The end of the air nozzle 2-3 away from the first silicone air tube 2-1 and the second silicone air tube 2-2 is connected to a medical air pump. The medical air pump has multiple ports, and each air supply port is equipped with a solenoid valve.
[0020] When it is necessary to remove the ureteral stent, first start the medical air pump to supply air to the second silicone air tube 2-2, so that the annular air balloon 4-1 expands. Since the opening space of the groove 4-2 is larger than the size of the traction arm 4-3, the annular air balloon 4-1 expands outward after inflation. The groove 4-2 pushes the traction arm 4-3 to rotate, which in turn drives the nickel-titanium blade 4-6 to rotate. The cutting edge of the nickel-titanium blade 4-6 faces inward. After rotation, they close together to cut the ureteral stent. After the rupture, following the gas supply sequence, the medical air pump first supplies air to the foremost first silicone endotracheal tube 2-1 for 1 second. The gas enters the annular airbag 3-1, causing the annular airbag 3-1 and the comma-shaped airbag 3-2 to inflate. The cross-section of the comma-shaped airbag 3-2 is comma-shaped, with its front end tilted forward and maintained in this position by the memory metal strip 3-3. The front surface is provided with pleats to allow it to tilt forward. After inflation, the front end of the comma-shaped airbag 3-2 contracts backward, causing the severed ureteral stent inside the silicone outer tube 1 to move backward. After 1 second, air is drawn from the foremost first silicone endotracheal tube 2-1 to cause it to contract. After the first silicone endotracheal tube 2-1 is drawn from the foremost side, air is supplied to the rear first silicone endotracheal tube 2-1 and then drawn from the rear side for 1 second. This achieves the intermittent contraction and expansion of the peristaltic transport component 3, causing the ureteral stent to move continuously backward, and finally the stent is removed.
[0021] Example 2: After the device for convenient removal of the ureteral stent after ureteral stone surgery is ready, i.e., the silicone outer tube 1 is inserted into the ureter and all components are connected and fixed, the ureteral stent removal operation begins. First, air is supplied to the second silicone air tube 2-2 through a medical air pump, the annular balloon 4-1 inflates, pushes the groove 4-2 to make the traction arm 4-3 rotate around the pivot 4-4, and drives the nickel-titanium blade 4-6 to close and cut the ureteral stent. Next, the transport operation is carried out, starting with the peristaltic transport component 3 closest to the cut-off component 4. The medical air pump supplies air to the first silicone tube 2-1 corresponding to this component. The air enters the annular balloon 3-1 through the first silicone tube 2-1. The annular balloon 3-1 and the comma-shaped balloon 3-2 inflate. The front end of the comma-shaped balloon 3-2 contracts backward to grasp the cut ureteral stent. After 1 second, air is aspirated from the first silicone tube 2-1 to cause the component to contract. Then, after 1 second interval, the same air supply and aspiration operation is performed on the first silicone tube 2-1 corresponding to the adjacent peristaltic transport component 3. Each peristaltic transport component 3 contracts and expands intermittently in sequence, gradually transporting the ureteral stent backward until it is completely removed.
[0022] Example 3: When the device is in usable condition, the silicone outer tube 1 is properly positioned inside the ureter, and all air tubes and the air pump are properly connected, the ureteral stent is removed. First, the medical air pump is used to inflate the annular balloon 4-1 through the second silicone air tube 2-2. The annular balloon 4-1 expands, and the groove 4-2 pushes the traction arm 4-3, causing the nickel-titanium blade 4-6 to rotate and close, cutting the ureteral stent. The transport process then proceeds in a front-to-back sequence. The medical air pump operates on the first silicone tube 2-1 corresponding to each peristaltic transport component 3 sequentially. First, air is supplied to the first silicone tube 2-1 of the first peristaltic transport component 3 for 1 second, causing the annular airbag 3-1 and the comma-shaped airbag 3-2 to inflate. The front end of the comma-shaped airbag 3-2 contracts to grasp the stent. After 1 second, air is aspirated to cause the component to contract. After an interval of 1 second, the same air supply and aspiration operation is performed on the first silicone tube 2-1 of the second peristaltic transport component 3. This process continues in this manner, with each peristaltic transport component 3 working intermittently to gradually transport the severed ureteral stent backward, ultimately completing the stent removal.
[0023] Based on the above-described preferred technical solution, the workflow of this technical solution is explained as follows: The front section of the silicone outer tube 1 is inserted into the ureter, ensuring that the rear section of the silicone outer tube 1 is located outside the ureter. The through hole opened on the front section of the silicone outer tube 1 for the first silicone air tube 2-1 and the second silicone air tube 2-2 to pass through is filled with sealant. The sections of the first silicone air tube 2-1 and the second silicone air tube 2-2 located outside the silicone outer tube 1 are tightly fixed to the outer surface of the silicone outer tube 1 with adhesive. The ends of the first silicone air tube 2-1 and the second silicone air tube 2-2 away from the air nozzle 2-3 are respectively inserted into the inner cavities of the annular air bag 3-1 and the ring-shaped air bag 4-1. The end of the air nozzle 2-3 away from the first silicone air tube 2-1 and the second silicone air tube 2-2 is connected to a medical air pump. The medical air pump has multiple ports, and each air supply port is equipped with a solenoid valve for controlling air supply or aspiration. When the ureteral stent needs to be removed, the medical air pump is first activated to supply air to the second silicone air tube 2-2. The air enters the annular balloon 4-1 through the second silicone air tube 2-2. The annular balloon 4-1 inflates. Since the space of the 16-24 grooves 4-2 arranged in a ring on the outer surface of the annular balloon 4-1 is larger than the size of the traction arm 4-3 at the end of the rotating shaft 4-4 behind the connecting block 4-5 fixed on the inner wall of the silicone outer tube 1, when the annular balloon 4-1 inflates and expands outward, the grooves 4-2 push the traction arm 4-3 to rotate around the rotating shaft 4-4, which in turn drives the nickel-titanium blade 4-6 fixed on the outer surface of the rotating shaft 4-4 to rotate. The cutting edge of the nickel-titanium blade 4-6 faces inward. After rotation, they close together to cut the ureteral stent, so that it can be removed in segments later, reducing the risk of ureteral traction damage caused by direct removal.
[0024] After the ureteral stent is cut, the stent is transported. Following the air supply sequence, the medical air pump first supplies air to the foremost silicone tube 2-1 for 1 second. The air then enters the annular balloon 3-1 through the first silicone tube 2-1. The annular balloon 3-1 and 8-12 comma-shaped balloons 3-2, arranged in a ring array and fixedly connected to the front end face of the annular balloon 3-1, inflate. The comma-shaped balloons 3-2 are hollow inside, with a comma-shaped cross-section. The front end curves forward and is maintained in this position by 2-3 shape-memory metal strips 3-3 fixed to the front arc surface of the comma-shaped balloons 3-2. The front surface of the comma-shaped balloons 3-2 has folds to allow it to curve forward. After inflation, the comma-shaped balloons 3-2... The front end contracts backward, thereby moving the severed ureteral stent inside the silicone outer tube 1 backward. After 1 second, the medical air pump evacuates the first silicone trachea 2-1 at the front, causing the annular balloon 3-1 and the comma-shaped balloon 3-2 to contract. After 1 second of evacuation from the first silicone trachea 2-1 at the front, the medical air pump supplies air to the first silicone trachea 2-1 at the rear for 1 second, causing the corresponding peristaltic transport component 3 to expand, moving the stent backward. After 1 second, air is evacuated again to cause it to contract. This achieves intermittent contraction and expansion of the peristaltic transport component 3. Each peristaltic transport component 3 works in sequence, continuously moving the ureteral stent backward, and finally removing the stent from the ureter.
[0025] This invention is not limited to the preferred embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Finally, it should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this application, should still fall within the scope of the technical content disclosed in this application.
Claims
1. A device for convenient removal of a stent after ureteral stone surgery, comprising a silicone outer tube (1), characterized in that: The inner cavity of the silicone outer tube (1) is fixed with multiple sets of peristaltic transport components (3) arranged at equal distances. A cutting component (4) is provided in the middle section of the inner cavity of the silicone outer tube (1). A tracheal assembly (2) connected to the peristaltic transport components (3) and the cutting component (4) is provided through the outer surface of the silicone outer tube (1). The tracheal assembly (2) includes several first silicone tracheals (2-1) that are connected to the peristaltic transport assembly (3) and a second silicone tracheal tube (2-2) that is connected to the cutting assembly (4). The ends of the first silicone tracheal tube (2-1) and the second silicone tracheal tube (2-2) that are away from the silicone outer tube (1) are both fixed with air nozzles (2-3). Each of the peristaltic transport components (3) includes an annular airbag (3-1), and 8-12 comma-shaped airbags (3-2) are fixedly connected in an annular array to the front end face of the annular airbag (3-1). Each of the comma-shaped airbags (3-2) has 2-3 memory metal strips (3-3) fixed on the front arc surface. The cutting component (4) includes an annular airbag (4-1), 16-24 grooves (4-2) arranged in an annular array on the outer surface of the annular airbag (4-1), and 16-24 connecting blocks (4-5) arranged in an annular array fixed on the inner wall of the silicone outer tube (1). A rotating shaft (4-4) is rotatably connected to the rear side wall of each connecting block (4-5). A nickel-titanium blade (4-6) is fixedly connected to the outer surface of the rotating shaft (4-4). A traction arm (4-3) that is coupled and adapted to the groove (4-2) is fixed to the rear end of each rotating shaft (4-4).
2. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The front section of the silicone outer tube (1) is inserted into the ureter, and the rear section of the silicone outer tube (1) is located outside the ureter. The front section of the silicone outer tube (1) has multiple through holes for the first silicone air tube (2-1) and the second silicone air tube (2-2) to pass through. The gaps inside the through holes are filled with sealant.
3. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The sections of the first silicone tube (2-1) and the second silicone tube (2-2) located outside the silicone outer tube (1) are both tightly fixed to the outer ring surface of the silicone outer tube (1) with adhesive. The ends of the first silicone tube (2-1) and the second silicone tube (2-2) away from the air nozzle (2-3) respectively penetrate into the inner cavity of the annular airbag (3-1) and the ring-shaped airbag (4-1).
4. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The ends of the air nozzles (2-3) that are far from the first silicone air tube (2-1) and the second silicone air tube (2-2) are connected to a medical air pump. The medical air pump has multiple ports, and each air supply port is equipped with a solenoid valve to control the supply or suction of air into the first silicone air tube (2-1) or the second silicone air tube (2-2). The air supply sequence of the first silicone air tube (2-1) and the second silicone air tube (2-2) is as follows: the first silicone air tube (2-1) at the front is supplied with air for 1 second to expand the peristaltic transport component (3) and then is suctioned to make it contract. After the suction of the first silicone air tube (2-1) at the front is completed, air is supplied to the first silicone air tube (2-1) at the rear for 1 second and then suctioned, thereby realizing the intermittent contraction and expansion of the peristaltic transport component (3) to drive the ureteral stent to move backward.
5. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: Both the annular airbag (3-1) and the comma-shaped airbag (3-2) are hollow inside. The cross-section of the comma-shaped airbag (3-2) is comma-shaped, and the front end of the comma-shaped airbag (3-2) is tilted forward. The comma-shaped airbag (3-2) is kept tilted forward by the memory metal strip (3-3). After the annular airbag (3-1) is inflated by the first silicone air tube (2-1) to make the comma-shaped airbag (3-2) expand, the front end of the comma-shaped airbag (3-2) contracts backward, thereby driving the ureteral stent inside the silicone outer tube (1) to move backward.
6. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The comma-shaped airbag (3-2) has folds on its front surface that allow it to tilt forward.
7. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The annular airbag (3-1) has a circular hole on its rear end face for the first silicone air tube (2-1) to pass through, and the gap inside the circular hole is filled with sealant.
8. The device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The cutting edges of the nickel-titanium blades (4-6) face inward and are used to cut the ureteral stent by rotating and closing together, thereby facilitating the peristaltic transport assembly (3) to transport and remove the cut ureteral stent, reducing the ureteral pulling damage caused by direct removal.
9. A convenient stent removal device after ureteral stone surgery according to claim 1, characterized in that: The annular airbag (4-1) has a circular hole on its rear end face for the second silicone air tube (2-2) to pass through, and the gap inside the circular hole is filled with sealant.
10. A device for convenient removal of a stent after ureteral stone surgery according to claim 1, characterized in that: The groove (4-2) has a larger opening space than the traction arm (4-3). After the annular airbag (4-1) is inflated, it expands outward and uses the groove (4-2) to push the traction arm (4-3) to rotate, thereby driving the nickel-titanium blade (4-6) to rotate and close together to cut the ureteral stent, so that the stent can be removed in segments.