Esophageal stent extractor

Abstract

The invention relates to the technical field of esophageal stent surgical instruments, in particular to an esophageal stent extractor which comprises a first sleeve, a core rod, a first claw assembly and a second claw assembly. Specifically, the first sleeve comprises a first in-vivo end and a first in-vitro end; the core rod penetrates through the first sleeve and comprises a second in-vivo end and a second in-vitro end; the second in-vivo end extends out of the first in-vivo end, and the second in-vitro end extends out of the first in-vitro end; the first claw assembly is connected with the first in-vivo end and used for hooking one end of the esophageal stent; the second claw assembly is connected with the second in-vivo end and used for hooking the other end of the esophageal stent. The esophageal stent taking-out device has the effects of improving the safety of the esophageal stent taking-out process and reducing damage to the esophagus.

Description

Technical Field

[0001] This application relates to the field of esophageal stent technology, and in particular to an esophageal stent removal device. Background Technology

[0002] Esophageal stents are medical devices used to treat benign or malignant esophageal strictures or obstructions, such as those caused by esophageal cancer or post-operative anastomotic stenosis. After placement, the stent can relieve obstruction and improve symptoms such as dysphagia. However, if the stent fails to reach its intended location due to improper placement, symptom relief after treatment, stent displacement, or stent impaction, it must be removed. Otherwise, prolonged stent retention can cause pain and irritation and may even induce cancer.

[0003] In related technologies, patent CN115969599A discloses an endoscopic esophageal stent remover, including a forceps head, an outer tube, and a handle. The front end of the outer tube is hinged to the forceps head, and the rear end is fixedly connected to the handle. Inside the outer tube is a guide rope for operating the opening and closing of the forceps head. A controller that can move back and forth is fitted on the handle. The controller is fixedly connected to the guide rope. It also includes an outer sheath, which is fitted outside the outer shell and can move forward to wrap around the forceps head and can move backward to expose the forceps head. An elastic retainer is installed on the handle so that the outer sheath always wraps around the forceps head in its natural state. The elastic retainer can move back and forth synchronously with the outer sheath, either partially or completely.

[0004] However, when using the esophageal stent remover in the aforementioned related technologies to remove the esophageal stent, it is necessary to drag the esophageal stent out of the esophagus from its installation position. During the entire process, the stent slides against the inner wall of the esophagus, which can easily scratch the esophagus or damage the esophageal mucosa. Summary of the Invention

[0005] To improve the safety of esophageal stent removal and reduce damage to the esophagus, this application provides an esophageal stent remover.

[0006] The esophageal stent removal device provided in this application adopts the following technical solution: An esophageal stent removal device, comprising: The first sleeve includes a first inner end and a first outer end; A core rod penetrates the first sleeve, the core rod including a second inner end and a second outer end; the second inner end extends out of the first inner end, and the second outer end extends out of the first outer end; The first hook assembly is connected to the inner end of the first body and is used to hook one end of the esophageal stent. The second hook assembly, connected to the inner end of the second body, is used to hook the other end of the esophageal stent.

[0007] By adopting the above technical solution, the safety of the esophageal stent removal process is improved, and damage to the esophagus is reduced. Specifically, during the esophageal stent removal surgery, the removal device is first inserted into the designated location in the patient's esophagus, bringing the first and second inner ends of the stent close to it. Then, one end of the stent is hooked by the first hook assembly, while the other end is hooked by the second hook assembly. This allows the operator to adjust the relative distance between the first and second inner ends by manipulating the mandrel to slide against the first cannula, applying axial tension to the stent. Under this axial tension, the stent undergoes axial stretching accompanied by radial contraction, causing the outer wall of the stent to actively detach or reduce pressure on the inner wall of the esophagus. This method of contraction followed by removal changes the traditional rigid dragging approach, improving the safety of the esophageal stent removal process and reducing mechanical damage to the esophagus.

[0008] Optionally, it also includes a second sheath, the second sheath comprising a third inner end and a third outer end, the first inner end extending into the second sheath via the third outer end; the first claw assembly has a first deployed state and a first folded state; in the first deployed state, the first claw assembly is capable of hooking the end of the esophageal stent away from the stomach; in the first folded state, the first claw assembly is capable of being housed within the second sheath; and when the first claw assembly is housed within the second sheath, the second sheath is capable of restricting the first claw assembly to the first folded state; after the first claw assembly is released from external restriction in the first folded state, it can automatically revert to the first deployed state; the second claw assembly has a second deployed state and a second folded state; in the second deployed state, the second claw assembly is capable of hooking the end of the esophageal stent near the stomach; in the second folded state, the second claw assembly is capable of being housed within the second sheath; and when the second claw assembly is housed within the second sheath, the second sheath is capable of restricting the second claw assembly to the second folded state; after the second claw assembly is released from external restriction in the second folded state, it can automatically revert to the second deployed state.

[0009] By adopting the above technical solution, in the initial state, both the first and second hook assemblies are located within the second cannula. The second cannula restricts the first hook assembly to a first folded state and the second hook assembly to a second folded state. This reduces the possibility of esophageal damage from the first and second hook assemblies during the insertion of the entire extractor into the patient's esophagus, improving surgical safety. Once the extractor is in place, the first cannula and the mandrel slide together relative to the second cannula, causing the inner ends of the second and first internal organs to extend sequentially from the third internal organ. As the second internal organ extends from the third internal organ, it causes the second hook assembly to detach from the second cannula's restriction and transition to a second unfolded state to hook the end of the esophageal stent closest to the stomach. Conversely, as the first internal organ extends from the third internal organ, it causes the first hook assembly to detach from the second cannula's restriction and transition to a first unfolded state to hook the end of the esophageal stent furthest from the stomach. This achieves anchorage at both ends of the esophageal stent, improving the smoothness of the extractor insertion and stent retrieval process.

[0010] Optionally, the first hook assembly is provided with multiple hooks spaced apart in the circumferential direction along the axis of the first sleeve. The first hook assembly includes a first swing rod, a first hook tooth, and a first elastic element. One end of the first swing rod is rotatably connected to the inner end of the first sleeve, and the other end of the first swing rod extends away from the inner end of the first sleeve. The rotation axis of the first swing rod intersects with the central axis of the first sleeve. The first hook tooth is connected to the end of the first swing rod away from the inner end of the first sleeve and is used to hook the end of the esophageal stent away from the stomach. The first elastic element is used to make the end of the first swing rod away from the inner end of the first sleeve tend to move towards the outer end of the first sleeve.

[0011] By adopting the above technical solution, multiple first hook assemblies can simultaneously hook the end of the esophageal stent furthest from the stomach from multiple points, improving the circumferential uniformity of force on the esophageal stent and reducing the possibility of the esophageal stent tilting or the mesh breaking due to excessive local force during subsequent axial stretching. When the inner end of the first inner tube extends beyond the inner end of the third inner tube and the first hook assembly is released from the restriction of the second sleeve, the end of the first swing arm furthest from the inner end of the first inner tube can move towards the outer end of the first outer tube under the action of the first elastic element, causing multiple first swing arms to open radially along the first sleeve to drive multiple first hook teeth to hook the end of the esophageal stent furthest from the stomach. During axial stretching of the esophageal stent, the end of the first swing arm furthest from the inner end of the first inner tube will move away from the outer end of the first outer tube under the action of the radial contraction force of the esophageal stent, causing multiple first swing arms to converge radially along the first sleeve. This further reduces the possibility of the first hook teeth scratching the esophagus during the removal of the esophageal stent by the extractor, improving the safety of esophageal stent removal.

[0012] Optionally, the first hook includes a first connecting rod and a first ball. One end of the first connecting rod is connected to the end of the first swing rod away from the inner end of the first body, and the other end of the first connecting rod is connected to the first ball. The diameter of the first ball is larger than the diameter of the first connecting rod, and a first groove for accommodating the mesh wire of the esophageal stent is formed between the first ball and the end of the first swing rod away from the inner end of the first body.

[0013] By adopting the above technical solution, the first sphere, with its diameter larger than that of the first connecting rod, acts as a mechanical stop, ensuring that once the esophageal stent's mesh wires slide into the first groove, they are securely locked onto the first hook teeth. This reduces the risk of the mesh wires dislodging from the first hook teeth due to force fluctuations during axial tensioning of the esophageal stent. Furthermore, the blunt structure of the smooth first sphere, as it moves within the esophagus with the first cannula or searches for the engagement point with the esophageal stent, minimizes punctures or scratches to the esophagus, reducing surgical risks.

[0014] Optionally, the second hook assembly is provided with multiple hooks spaced apart along the circumferential direction of the axis of the core rod. The second hook assembly includes a second swing rod, a second hook tooth, and a second elastic element. One end of the second swing rod is rotatably connected to the inner end of the second body, and the other end of the second swing rod extends away from the inner end of the second body. The rotation axis of the second swing rod intersects with the central axis of the core rod. The second hook tooth connects to the end of the second swing rod away from the inner end of the second body and is used to hook the end of the esophageal stent near the stomach. The second elastic element is used to cause the end of the second swing rod away from the inner end of the second body to tend to move away from the outer end of the first body.

[0015] By adopting the above technical solution, multiple second hook assemblies can simultaneously hook the end of the esophageal stent near the stomach from multiple points, improving the circumferential uniformity of force on the esophageal stent and reducing the possibility of the esophageal stent tilting or the mesh breaking due to excessive local force during subsequent axial stretching. When the inner end of the second inner end extends beyond the inner end of the third inner end and the second hook assembly is released from the constraint of the second cannula, the end of the second swing arm away from the inner end of the second inner end can move away from the outer end of the second inner end under the action of the second elastic element, causing multiple second swing arms to open radially along the core rod, thereby driving multiple second hook teeth to hook the end of the esophageal stent away from the stomach. During axial stretching of the esophageal stent, the end of the second swing arm away from the inner end of the second inner end will move towards the outer end of the second inner end under the action of the radial contraction force of the esophageal stent, causing multiple second swing arms to converge radially along the core rod. This further reduces the possibility of the second hook teeth scratching the esophagus during the removal of the esophageal stent by the extractor, improving the safety of esophageal stent removal.

[0016] Optionally, the second hook includes a second connecting rod and a second ball. One end of the second connecting rod is connected to the end of the second swing rod away from the inner end of the second body, and the other end of the second connecting rod is connected to the second ball. The diameter of the second ball is larger than the diameter of the second connecting rod, and a second groove for accommodating the mesh wire of the esophageal stent is formed between the second ball and the end of the second swing rod away from the inner end of the second body.

[0017] By adopting the above technical solution, the second sphere, with its larger diameter than the second connecting rod, acts as a mechanical stop, ensuring that once the esophageal stent's mesh wires slide into the second groove, they are securely locked onto the second hook teeth. This reduces the risk of the mesh wires dislodging from the second hook teeth due to force fluctuations during axial tensioning of the esophageal stent. Furthermore, the blunt structure of the smooth second sphere, as it moves with the mandrel within the esophagus or searches for the engagement point with the esophageal stent, minimizes punctures or scratches to the esophagus, reducing surgical risks.

[0018] Optionally, the second hook assembly further includes a reset pull rope, one end of which is connected to the end of the second swing arm away from the inner end of the second body, and the other end of which extends from the outer end of the first body via the inner end of the first body.

[0019] By adopting the above technical solution, when operating the second hook assembly to retrieve the esophageal stent, the operator can only drive the end of the second swing arm away from the inner end of the second body to move closer to the outer end of the second body by pulling the reset rope, so as to change the retrieval posture of the second hook teeth. This allows for on-site adjustment and re-retrieval without removing the entire retrieval device, thereby improving the safety of the esophageal stent retrieval process.

[0020] Optionally, both the first sleeve and the second sleeve are flexible tubes, and the core rod is a steel wire.

[0021] By adopting the above technical solution, the entire extraction device possesses good bending ability and a certain axial stiffness. It can conform to the physiological curvature of the esophagus, reducing damage to the esophagus.

[0022] Optionally, a locking assembly is also included, comprising a threaded sleeve and a nut; the threaded sleeve is fitted onto the outside of the second outer end and connected to the second outer end, the nut is rotatably connected to the first outer end and threadedly connected to the threaded sleeve, and the rotation axis of the nut is parallel to the extension direction of the core rod.

[0023] By adopting the above technical solution, the operator can precisely control the stretching degree of the esophageal stent and fix the stretching position through the self-locking function of the threaded pair, avoiding axial retraction of the esophageal stent caused by unstable manual control, thus improving the precision and safety of the operation.

[0024] Optionally, a protective sleeve is connected to the inner end of the second body, the protective sleeve being made of rubber or silicone. By adopting the above technical solution, during the process of inserting the extractor into the esophagus or during the process of the second inner end extending out of the third inner end, the protective sleeve can first come into contact with the esophageal tissue, reducing the possibility of the second inner end of the core rod directly contacting the inner wall of the esophagus and causing esophageal damage.

[0025] In summary, this application includes the following beneficial technical effects: 1. During esophageal stent removal surgery, the removal device is first inserted into the designated location within the patient's esophagus, bringing the first and second inner ends of the stent close to the esophageal stent. Then, one end of the esophageal stent is hooked by the first hook assembly, while the other end is hooked by the second hook assembly. This allows the operator to adjust the relative distance between the first and second inner ends by manipulating the mandrel and sliding it against the first cannula, applying axial tension to the esophageal stent. Under this axial tension, the esophageal stent undergoes axial stretching accompanied by radial contraction, thereby actively detaching the outer wall of the stent or reducing pressure on the inner wall of the esophagus. This method of contraction followed by removal changes the traditional rigid dragging approach, improving the safety of the esophageal stent removal process and reducing mechanical damage to the esophagus. 2. In the initial state, both the first and second hook assemblies are located within the second cannula. The second cannula restricts the first hook assembly in a first folded state and the second hook assembly in a second folded state. This reduces the likelihood of esophageal damage from the first and second hook assemblies during insertion of the entire extractor into the patient's esophagus, improving surgical safety. Once the extractor is in place, the first cannula and the mandrel slide together relative to the second cannula, causing the inner ends of the second and first internal organs to extend sequentially from the inner end of the third internal organ. As the second internal organ extends from the third internal organ, it causes the second hook assembly to detach from the second cannula and transition to a second unfolded state, hooking the end of the esophageal stent closest to the stomach. Conversely, as the first internal organ extends from the third internal organ, it causes the first hook assembly to detach from the second cannula and transition to a first unfolded state, hooking the end of the esophageal stent furthest from the stomach. This anchors both ends of the esophageal stent, improving the smoothness of the extractor insertion and stent retrieval process. 3. The operator can precisely control the stretching degree of the esophageal stent and fix the stretching position through the self-locking function of the threaded pair, avoiding axial retraction of the esophageal stent caused by unstable manual control, thus improving the precision and safety of the operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the internal structure of an embodiment of this application.

[0028] Figure 3 This mainly demonstrates the positional status of each component during the esophageal stent hooking and axial stretching of the extractor in the embodiments of this application.

[0029] Figure 4 yes Figure 2 A magnified view of part A in the middle.

[0030] Figure 5 yes Figure 2 A magnified view of part B in the middle section.

[0031] Figure 6 yes Figure 2 A magnified view of part C in the middle.

[0032] Explanation of reference numerals in the attached drawings: 1. First sleeve; 11. Inner end of the first body; 12. Outer end of the first body; 2. Core rod; 21. Inner end of the second body; 22. Outer end of the second body; 3. First hook assembly; 31. First swing rod; 32. First hook tooth; 320. First groove; 321. First connecting rod; 322. First ball; 33. First elastic element; 4. Second hook assembly; 41. Second swing rod; 42. Second hook tooth; 420. Second groove; 421. Second connecting rod; 422. Second ball; 43. Second elastic element; 44. Reset pull rope; 5. Second sleeve; 51. Inner end of the third body; 52. Outer end of the third body; 6. Locking assembly; 61. Threaded sleeve; 62. Nut; 7. Protective sleeve. Detailed Implementation

[0033] The following combination Figures 1-6 This application will be described in further detail.

[0034] This application discloses an esophageal stent removal device.

[0035] Reference Figure 1 and Figure 2 In this embodiment, the extractor includes a first sleeve 1, a core rod 2, a first hook assembly 3, a second hook assembly 4, a second sleeve 5, and a locking assembly 6.

[0036] The first cannula 1 includes a first inner end 11 and a first outer end 12; the core rod 2 penetrates the first cannula 1 and includes a second inner end 21 and a second outer end 22; the second inner end 21 extends out of the first inner end 11, and the second outer end 22 extends out of the first outer end 12. A first claw assembly 3 is connected to the first inner end 11 and is used to hook one end of the esophageal stent. A second claw assembly 4 is connected to the second inner end 21 and is used to hook the other end of the esophageal stent.

[0037] Specifically, the inner diameter of the first cannula 1 matches the outer diameter of the core rod 2, and the core rod 2 slides along its own central axis to connect with the first cannula 1. The first inner end 11 and the second inner end 21 are both used to penetrate into the esophagus so that the first hook assembly 3 and the second hook assembly 4 can hook the esophageal stent; the first outer end 12 and the second outer end 22 are both located outside the patient for the operator to operate on.

[0038] In this way, during the esophageal stent removal surgery, the removal device is first inserted into the designated position in the patient's esophagus, bringing the first inner end 11 and the second inner end 21 close to the esophageal stent. Then, one end of the esophageal stent is hooked by the first hook assembly 3, while the other end is hooked by the second hook assembly 4. This allows the operator to adjust the relative distance between the first inner end 11 and the second inner end 21 by manipulating the sliding of the core rod 2 and the first sleeve 1, applying axial tension to the esophageal stent. This causes the esophageal stent to stretch axially and contract radially, thereby actively detaching the outer wall of the esophageal stent or reducing the pressure on the inner wall of the esophagus, reducing mechanical damage to the esophagus during the esophageal stent removal process.

[0039] Reference Figure 2 and Figure 3 In this embodiment, the second sleeve 5 includes a third inner end 51 and a third outer end 52, and the first inner end 11 extends into the second sleeve 5 via the third outer end 52. The inner diameter of the second sleeve 5 matches the outer diameter of the first sleeve 1, and the first sleeve 1 is slidably connected to the second sleeve 5 along its own central axis.

[0040] The inner third end 51 is used to penetrate deep into the esophagus, while the outer third end 52 is located outside the patient for the operator to use.

[0041] The first hook assembly 3 has a first unfolded state and a first folded state. In the first folded state, the outer diameter of the first hook assembly 3 matches the inner diameter of the first sleeve 1. In the first unfolded state, the first hook assembly 3 can hook the end of the esophageal stent furthest from the stomach. In the first folded state, the first hook assembly 3 can be housed within the second sleeve 5. When the first hook assembly 3 is housed within the second sleeve 5, the second sleeve 5 can confine the first hook assembly 3 to the first folded state. After being released from external confinement in the first folded state, the first hook assembly 3 can automatically revert to the first unfolded state.

[0042] The second hook assembly 4 has a second deployed state and a second folded state. In the second folded state, the outer diameter of the second hook assembly 4 matches the inner diameter of the first sleeve 1. In the second deployed state, the second hook assembly 4 can hook the end of the esophageal stent near the stomach; in the second folded state, the second hook assembly 4 can be housed within the second sleeve 5. When the second hook assembly 4 is housed within the second sleeve 5, the second sleeve 5 can confine the second hook assembly 4 to the second folded state; after being released from external confinement in the second folded state, the second hook assembly 4 can automatically revert to the second deployed state.

[0043] In this way, in the initial state, both the first hook assembly 3 and the second hook assembly 4 are located inside the second sleeve 5. The first hook assembly 3 is in a first folded state and the second hook assembly 4 is in a second folded state due to the restrictive effect of the second sleeve 5. This reduces the possibility of damage to the patient's esophagus by the first hook assembly 3 and the second hook assembly 4 during the process of inserting the entire extractor into the patient's esophagus.

[0044] Once the extractor is in place, the first sleeve 1 and the core rod 2 slide together relative to the second sleeve 5, causing the second inner end 21 and the first inner end 11 to extend sequentially out of the third inner end 51. As the second inner end 21 extends out of the third inner end 51, it causes the second hook assembly 4 to disengage from the second sleeve 5 and enter a second deployed state, thus hooking the end of the esophageal stent closest to the stomach. Conversely, as the first inner end 11 extends out of the third inner end 51, it causes the first hook assembly 3 to disengage from the second sleeve 5 and enter a first deployed state, thus hooking the end of the esophageal stent furthest from the stomach.

[0045] Preferably, both the first sleeve 1 and the second sleeve 5 are flexible tubes, which can be made of medical-grade plastic or rubber. The core rod 2 is made of steel wire, which can be made of medical-grade stainless steel. In this way, the entire extraction device can conform to the physiological curvature of the esophagus, reducing damage to the esophagus, while effectively transmitting the pulling force to achieve the action of hooking and circumferentially stretching the esophageal stent.

[0046] The inner end 21 of the second inner part of the core rod 2 is connected to a protective sleeve 7, which is made of rubber or silicone. In this way, during the process of inserting the extractor into the esophagus or during the process of the second inner inner part 21 extending out of the third inner inner part 51, the protective sleeve 7 can reduce the possibility of the second inner inner part 21 directly contacting the inner wall of the esophagus and causing esophageal damage.

[0047] Reference Figure 2 and Figure 4 In this embodiment, the first hook assembly 3 is arranged in a circumferential array along the axis of the first sleeve 1, and the specific number can be selected according to the requirements.

[0048] The first hook assembly 3 includes a first swing rod 31, a first hook tooth 32, and a first elastic element 33. The first swing rod 31 can be made of medical-grade stainless steel or plastic. One end of the first swing rod 31 is rotatably connected to the inner end 11 of the first inner tube, and the other end of the first swing rod 31 extends away from the inner end 11. The rotation axis of the first swing rod 31 is perpendicular to the central axis of the first sleeve 1.

[0049] The first hook tooth 32 is fixedly connected to the end of the first swing rod 31 away from the inner end 11 of the first body, and is used to hook the mesh wire of the esophageal stent away from the stomach. The first hook tooth 32 includes a first connecting rod 321 and a first ball 322, both of which can be made of the same material as the first swing rod 31. One end of the first connecting rod 321 is fixedly connected to the end of the first swing rod 31 away from the inner end 11 of the first body, and the other end of the first connecting rod 321 extends away from the first swing rod 31 and connects to the first ball 322.

[0050] The diameter of the first connecting rod 321 is smaller than the diameter of the first swing rod 31, and the diameter of the first ball 322 is larger than the diameter of the first connecting rod 321. A first groove 320 for accommodating the mesh wire of the esophageal stent is formed between the first ball 322, the end of the first swing rod 31 away from the inner end 11 of the first body, and the first connecting rod 321.

[0051] The first elastic element 33 can be a torsion spring. One end of the first elastic element 33 is connected to the inner end 11 of the first body, and the other end of the first elastic element 33 is connected to the first rocker arm 31, which is used to make the end of the first rocker arm 31 away from the inner end 11 tend to move closer to the outer end 12 of the first body.

[0052] In other embodiments, the rotation axis of the first rocker arm 31 may also be inclined to the central axis of the first sleeve 1; the first elastic element 33 may also be a spiral spring or a tension spring.

[0053] In this way, multiple first hook assemblies 3 can simultaneously hook the end of the esophageal stent away from the stomach from multiple points, improving the circumferential uniformity of the force on the esophageal stent and reducing the possibility of the esophageal stent tilting or the wire breaking due to excessive local force during subsequent axial stretching.

[0054] The first swing arm 31, together with the first elastic element 33, forms a mechanical hooking structure with "elastic memory". When the first inner end 11 extends out of the third inner end 51 and the first hook assembly 3 is released from the restriction of the second sleeve 5, the end of the first swing arm 31 away from the first inner end 11 can move closer to the first outer end 12 under the action of the first elastic element 33, so that multiple first swing arms 31 open radially along the first sleeve 1, thereby driving multiple first hook teeth 32 to hook the end of the esophageal stent away from the stomach.

[0055] When the esophageal stent is stretched axially, the end of the first rocker arm 31 furthest from the inner end 11 of the first body will move away from the outer end 12 of the first body under the radial contraction force of the esophageal stent, causing multiple first rocker arms 31 to converge radially along the first sleeve 1. This reduces the possibility of the first hook teeth 32 scratching the esophagus during the process of the extractor moving the esophageal stent out of the esophagus.

[0056] The structural design of the first claw tooth ensures that once the mesh of the esophageal stent slides into the first groove 320, it can be securely locked onto the first hook tooth 32. Furthermore, as the smooth first ball 322 moves within the esophagus with the first sleeve 1 or searches for a point of contact with the esophageal stent, even if the first ball head accidentally touches or abuts against the inner wall of the esophagus, its blunt structure minimizes any puncture or scratching to the esophagus.

[0057] Reference Figure 2 and Figure 5 In this embodiment, the second hook claw assembly 4 is arranged in a circumferential array along the axis of the core rod 2, and the specific number can be selected according to the requirements.

[0058] The second hook assembly 4 includes a second swing rod 41, a second hook tooth 42, and a second elastic element 43. The second swing rod 41 can be made of medical-grade stainless steel or plastic. One end of the second swing rod 41 is rotatably connected to the inner end 21 of the second inner tube, and the other end of the second swing rod 41 extends away from the inner end 21 of the second inner tube. The rotation axis of the second swing rod 41 is perpendicular to the central axis of the second sleeve 5.

[0059] The second hook 42 is fixedly connected to the end of the second swing rod 41 away from the inner end 21 of the second body, and is used to hook the mesh wire of the esophageal stent near the stomach. The second hook 42 includes a second connecting rod 421 and a second ball 422, both of which can be made of the same material as the second swing rod 41. One end of the second connecting rod 421 is fixedly connected to the end of the second swing rod 41 away from the inner end 21 of the second body, and the other end of the second connecting rod 421 extends away from the second swing rod 41 and connects to the second ball 422.

[0060] The diameter of the second connecting rod 421 is smaller than the diameter of the second swing rod 41, and the diameter of the second ball 422 is larger than the diameter of the second connecting rod 421. A second groove 420 for accommodating the mesh wire of the esophageal stent is formed between the second ball 422, the end of the second swing rod 41 away from the inner end 21 of the second body, and the second connecting rod 421.

[0061] The second elastic element 43 can be a torsion spring. One end of the second elastic element 43 is connected to the inner end 21 of the second body, and the other end of the second elastic element 43 is connected to the second rocker arm 41. It is used to make the end of the second rocker arm 41 away from the inner end 21 tend to move away from the outer end 22 of the second body.

[0062] In other embodiments, the rotation axis of the second rocker arm 41 may also be inclined to the central axis of the second sleeve 5; the second elastic element 43 may also be a spiral spring or a tension spring.

[0063] In this way, multiple second hook assemblies 4 can simultaneously hook the end of the esophageal stent near the stomach from multiple points, improving the circumferential uniformity of the force on the esophageal stent and reducing the possibility of the esophageal stent tilting or the wire breaking due to excessive local force during subsequent axial stretching.

[0064] The second swing arm 41, together with the second elastic element 43, forms a mechanical hooking structure with "elastic memory". When the inner end 21 of the second inner body extends out of the inner end 51 of the third inner body and the second hook assembly 4 is released from the restriction of the second sleeve 5, the end of the second swing arm 41 away from the inner end 21 can move away from the outer end 22 of the second outer body under the action of the second elastic element 43, so that multiple second swing arms 41 open radially along the second sleeve 5, thereby driving multiple second hook teeth 42 to hook the end of the esophageal stent near the stomach.

[0065] When the esophageal stent is stretched axially, the end of the second rocker arm 41 furthest from the inner end 21 of the second inner stent will move closer to the outer end 22 of the second outer stent under the radial contraction force of the esophageal stent, causing multiple second rocker arms 41 to converge radially along the core rod 2. This reduces the possibility of the second hook teeth 42 scratching the esophagus during the removal of the esophageal stent by the extractor.

[0066] The design of the second claw teeth ensures that once the esophageal stent's mesh wires slide into the second groove 420, they can be securely locked onto the second hook teeth 42. Furthermore, the smooth second ball 422, during its movement within the esophagus with the second sleeve 5 or in search of a point of contact with the esophageal stent, minimizes puncture or scratching of the esophagus due to its blunt structure, even if the second ball head accidentally touches or abuts against the esophageal wall.

[0067] Reference Figure 2 and Figure 5 In this embodiment, the second hook assembly 4 also includes a reset pull rope 44. The reset pull rope 44 can be a high-strength thin rope such as nylon rope. One end of the reset pull rope 44 is connected to the end of the second swing rod 41 away from the inner end 21 of the second body, and the other end of the reset pull rope 44 extends from the outer end 12 of the first body via the inner end 11 of the first body.

[0068] In this way, when the second hook assembly 4 is used to retrieve the esophageal stent, if the second hook tooth 42 fails to hook the mesh, the operator only needs to pull the reset pull rope 44 to overcome the force of the second elastic element 43 and drive the end of the second swing rod 41 away from the inner end 21 to move closer to the outer end 22 of the second body to change the retrieval posture of the second hook tooth 42. This allows for on-site adjustment and re-retrieval without removing the entire retrieval device, thus improving the safety of the esophageal stent retrieval process.

[0069] Furthermore, when operating the first hook assembly 3 to hook the esophageal stent, if the first hook tooth 32 fails to hook the mesh, the operator only needs to operate the first sleeve 1 to slide relative to the second sleeve 5, so that the inner end 51 of the third body abuts against the first swing rod 31, which can overcome the force of the first elastic element 33 and drive the end of the first swing rod 31 away from the inner end 11 to move away from the outer end 12 of the first body to change the hooking posture of the first hook tooth 32. This also realizes the adjustment and re-hooking operation in place without removing the entire extractor.

[0070] Reference Figure 2 and Figure 6 In this embodiment, the locking assembly 6 includes a threaded sleeve 61 and a nut 62. The threaded sleeve 61 is coaxially sleeved on the outside of the second outer end 22 and fixedly connected to the second outer end 22. The nut 62 is rotatably connected to the first outer end 12 and threadedly connected to the threaded sleeve 61, and the rotation axis of the nut 62 is parallel to the extension direction of the core rod 2.

[0071] In this way, the relative displacement between the core rod 2 and the first sleeve 1 is converted into threaded advancement through the cooperation of the threaded sleeve 61 and the nut 62. The operator can precisely control the stretching degree of the esophageal stent and fix the stretching position through the self-locking function of the threaded pair, avoiding axial retraction of the esophageal stent caused by unstable manual control.

[0072] The implementation principle of this application embodiment is as follows: During esophageal stent removal surgery, the removal device is first inserted into a designated position in the patient's esophagus, bringing the first inner end 11 and the second inner end 21 close to the esophageal stent. Then, one end of the esophageal stent is hooked by the first hook assembly 3, and the other end of the esophageal stent is hooked by the second hook assembly 4. This allows the operator to adjust the relative distance between the first inner end 11 and the second inner end 21 by manipulating the core rod 2 to slide against the first sleeve 1, applying axial tension to the esophageal stent, causing axial stretching and radial contraction of the esophageal stent. This allows the outer wall of the esophageal stent to actively detach or reduce pressure on the inner wall of the esophagus, reducing mechanical damage to the esophagus during the esophageal stent removal process.

[0073] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An esophageal stent removal device, characterized in that, include: The first cannula (1) includes a first inner end (11) and a first outer end (12). The core rod (2) penetrates the first sleeve (1). The core rod (2) includes a second inner end (21) and a second outer end (22). The second inner end (21) extends out of the first inner end (11), and the second outer end (22) extends out of the first outer end (12). The first hook assembly (3) is connected to the first internal end (11) and is used to hook one end of the esophageal stent. The second hook assembly (4) is connected to the second internal end (21) and is used to hook the other end of the esophageal stent.

2. The esophageal stent remover according to claim 1, characterized in that: It also includes a second sleeve (5), the second sleeve (5) including a third inner end (51) and a third outer end (52), the first inner end (11) extending into the second sleeve (5) via the third outer end (52); the first hook assembly (3) has a first unfolded state and a first folded state; In the first unfolded state, the first hook assembly (3) can hook the end of the esophageal stent away from the stomach; in the first folded state, the first hook assembly (3) can be housed in the second sleeve (5); and when the first hook assembly (3) is housed in the second sleeve (5), the second sleeve (5) can restrict the first hook assembly (3) to the first folded state; after the first hook assembly (3) is freed from external restriction in the first folded state, it can automatically change back to the first unfolded state; the second hook assembly (4) has a second unfolded state and a second folded state; In the second unfolded state, the second hook assembly (4) can hook the end of the esophageal stent near the stomach; in the second folded state, the second hook assembly (4) can be housed in the second sleeve (5); and when the second hook assembly (4) is housed in the second sleeve (5), the second sleeve (5) can restrict the second hook assembly (4) to the second folded state; after the second hook assembly (4) is freed from external restriction in the second folded state, it can automatically transform into the second unfolded state.

3. The esophageal stent remover according to claim 2, characterized in that: The first hook assembly (3) is provided with multiple hooks spaced apart in the circumferential direction along the axis of the first sleeve (1). The first hook assembly (3) includes a first rocker arm (31), a first hook tooth (32), and a first elastic element (33). One end of the first rocker arm (31) is rotatably connected to the inner end of the first sleeve (11), and the other end of the first rocker arm (31) extends away from the inner end of the first sleeve (11). The rotation axis of the first rocker arm (31) intersects with the central axis of the first sleeve (1). The first hook tooth (32) is connected to the end of the first rocker arm (31) away from the inner end of the first sleeve (11) and is used to hook the end of the esophageal stent away from the stomach. The first elastic element (33) is used to make the end of the first rocker arm (31) away from the inner end of the first sleeve (11) tend to move closer to the outer end of the first sleeve (12).

4. The esophageal stent removal device according to claim 3, characterized in that: The first hook tooth (32) includes a first connecting rod (321) and a first ball (322). One end of the first connecting rod (321) is connected to the end of the first swing rod (31) away from the inner end (11) of the first body, and the other end of the first connecting rod (321) is connected to the first ball (322). The diameter of the first ball (322) is larger than the diameter of the first connecting rod (321). A first groove (320) for accommodating the mesh wire of the esophageal stent is formed between the first ball (322) and the end of the first swing rod (31) away from the inner end (11) of the first body.

5. The esophageal stent remover according to claim 3, characterized in that: The second hook assembly (4) is provided with multiple hooks spaced apart in the circumferential direction along the axis of the core rod (2). The second hook assembly (4) includes a second swing rod (41), a second hook tooth (42), and a second elastic member (43). One end of the second swing rod (41) is rotatably connected to the inner end of the second body (21), and the other end of the second swing rod (41) extends away from the inner end of the second body (21). The rotation axis of the second swing rod (41) intersects with the central axis of the core rod (2). The second hook tooth (42) is connected to the end of the second swing rod (41) away from the inner end of the second body (21) and is used to hook the end of the esophageal stent near the stomach. The second elastic member (43) is used to make the end of the second swing rod (41) away from the inner end of the second body (21) tend to move away from the first outer end (12).

6. The esophageal stent removal device according to claim 5, characterized in that: The second hook tooth (42) includes a second connecting rod (421) and a second ball (422). One end of the second connecting rod (421) is connected to the end of the second swing rod (41) away from the inner end (21) of the second body, and the other end of the second connecting rod (421) is connected to the second ball (422). The diameter of the second ball (422) is larger than the diameter of the second connecting rod (421). A second groove (420) for accommodating the mesh wire of the esophageal stent is formed between the second ball (422) and the end of the second swing rod (41) away from the inner end (21) of the second body.

7. The esophageal stent remover according to claim 5, characterized in that: The second hook assembly (4) also includes a reset pull rope (44), one end of which is connected to the end of the second swing rod (41) away from the second inner end (21), and the other end of which extends out of the first outer end (12) via the first inner end (11).

8. An esophageal stent remover according to claim 2, characterized in that: Both the first sleeve (1) and the second sleeve (5) are flexible tubes, and the core rod (2) is a steel wire.

9. An esophageal stent remover according to claim 1, characterized in that: It also includes a locking assembly (6), which includes a threaded sleeve (61) and a nut (62); the threaded sleeve (61) is sleeved on the outside of the second outer end (22) and connected to the second outer end (22); the nut (62) is rotatably connected to the first outer end (12) and threadedly connected to the threaded sleeve (61); the rotation axis of the nut (62) is parallel to the extension direction of the core rod (2).

10. An esophageal stent remover according to claim 1, characterized in that: The inner end (21) of the second body is connected to a protective sleeve (7), which is made of rubber or silicone.

Images