A bracket recovery device

Abstract

The present invention discloses a stent recovery device, comprising a handle assembly, a sleeve, an inner core assembly, a hook, a traction line, and an expansion loop; in this solution, an operating handle is used to sequentially drive the connecting traction line, the inner core assembly, the expansion loop and the hook to move axially in the sleeve until the end of the expansion loop extends out of the sleeve and expands into a trumpet shape, and the hook extends out of the expansion loop and hooks the stent; during the recovery process, the operating handle drives the traction line to drive the hook and the stent to move simultaneously toward the trumpet-shaped end of the expansion loop; after moving a certain stroke, the trumpet end of the expansion loop completely wraps the stent and the hook due to the compression of the sleeve and then enters the sleeve together, driving the expansion loop and the inner core assembly to continue moving toward the operating handle for recovery, thereby avoiding secondary injury to the patient.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, and in particular to a stent recovery device. Background Art

[0002] Biomedical stents are widely used in the diagnosis and treatment of diseases. For example, gastrointestinal stents can be used to treat conditions such as gastrointestinal stenosis, gastrointestinal rupture, and anastomosis after gastrointestinal resection. Respiratory stents can be used to treat conditions such as tracheal stenosis and bronchial rupture. Intravascular stents can be used to treat intravascular plaque, vascular obstruction, and vascular stenosis. Currently, stents are primarily made of non-degradable materials, particularly memory metals such as nickel-titanium alloys. Once the anastomosis heals or the disease improves, the stent's function is fulfilled and the stent needs to be retrieved. Alternatively, stents may be improperly positioned, fall off, or the patient experiences an adverse reaction. However, stent retrieval remains a challenge.

[0003] The traditional retrieval method is to use hooks, biopsy forceps, foreign body forceps, etc. to hook the stent and forcibly pull it out with the assistance of an endoscope. This method has the following problems: First, there may be adhesion between the surrounding tissue of the stent and the stent. These devices cannot guarantee that the stent is hooked firmly, and the removal process may fail due to adhesion to the cavity mucosa; second, the stent is usually designed to be close to the diameter of the cavity. If it is forcibly pulled out, it is likely to scratch the inner wall of the cavity during the pulling process, causing harm to the patient; third, these devices are difficult to grasp during use and can easily fall off after grasping.

[0004] Clinical data show that there are many cases of implanted stent recovery. In order to solve the high surgical difficulty requirements of conventional recovery methods and the secondary trauma caused by stent recovery during patient surgery, previous researchers have proposed solutions such as gathering and compressing stent recovery. However, these solutions are either difficult to operate or cannot completely gather and compress the stent, and cannot solve the problem efficiently and easily.

[0005] For example, publication number: CN211095014U discloses a medical stent that can be recovered in vitro and a stent implantation system using the same, which includes a stent body with a through hollow cavity and a grid-like cylindrical structure, and a recovery line radially wound along the stent body at one axial end of the stent body; wherein the recovery line includes a surrounding portion radially wound around the end of the stent body, and an extension portion connected to the surrounding portion and suitable for extending from the natural cavity of the human body to the outside of the human body after the stent body is placed in the natural cavity of the human body. Although this solution can facilitate the recovery of the stent from outside the body to a certain extent and avoid the problem of the difficulty in finding the recovery line in the prior art. However, such a solution also has problems in the actual operation process, such as the inability to completely gather and compress the stent and the difficulty in operation.

[0006] It can be seen that how to avoid the above technical problems when recovering the stent is an urgent problem to be solved in this field. Summary of the Invention

[0007] In view of the technical problem in the prior art that the stent cannot be safely recovered, the present invention provides a stent recovery device that effectively overcomes the above technical problem.

[0008] To achieve the above-mentioned purpose, the present invention provides a stent retrieval device, comprising a handle assembly, a sleeve, an inner core assembly, a hook, a traction wire, and an expansion collar; the handle assembly is arranged in cooperation with the sleeve, the inner core assembly is movably disposed in the sleeve, and the expansion collar is movably disposed in the sleeve and is located between the inner core assembly and the end of the sleeve; one end of the traction wire is connected to the handle assembly, and the other end passes through the inner core assembly and the expansion collar in sequence to connect to the hook;

[0009] The handle assembly can drive the pulling line to drive the hook to extend out of the end of the sleeve, and after a certain movement stroke, drive the inner core assembly to move toward the expansion ring until the inner core assembly drives the end of the expansion ring to extend out of the sleeve, and the end of the expansion ring extending out of the sleeve can automatically expand into a trumpet shape;

[0010] The handle assembly can drive the traction line to drive the hook to retract the end of the sleeve, and synchronously drive the expansion ring to retract the end of the sleeve after a certain movement stroke. The end of the expansion ring in the expanded state can be retracted and restored under the compression of the sleeve end.

[0011] Furthermore, the handle assembly includes a front handle and a rear handle; the end of the front handle is inserted into the rear handle, and the end is connected to the traction line; the outside of the rear handle is fixedly connected to the sleeve.

[0012] Furthermore, the handle assembly also includes a locking assembly, and the locking assembly is arranged between the front handle and the rear handle.

[0013] Furthermore, the inner core component is arranged in the sleeve; the inner core component is a hollow structure, and a first collision block is provided on the end facing the operating handle to protect the inner core component from collision and damage.

[0014] Furthermore, a limit assembly is provided between the expansion collar and the traction line, and the limit assembly can synchronously drive the expansion collar in the extended and expanded state to move back to the end of the sleeve after the traction line moves and retracts the end of the sleeve for a certain distance.

[0015] Furthermore, the limiting assembly comprises a first blocking block and a second blocking block; the first blocking block is arranged on the expansion ring; and the second blocking block is arranged on the traction line located in the expansion ring corresponding to the first blocking block.

[0016] Furthermore, a sheath is provided in the stent recovery device; one end of the sheath is connected to the front handle of the operating handle, and the other end is arranged facing the inner core assembly.

[0017] Furthermore, a second collision block is provided at the end of the sheath tube facing the inner core assembly for protecting the sheath tube from collision damage.

[0018] Furthermore, a protective layer is provided on the outer side of the end of the sleeve to reduce wear and tear of the sleeve.

[0019] Furthermore, a head assembly for sealing the external sleeve is provided at the end port of the sleeve.

[0020] The stent retrieval device provided by the present invention utilizes a hook to pull the stent for retrieval, and can store the stent in a device with a smaller diameter in the body, thereby avoiding unnecessary damage to the cavity mucosa caused by the stent being in an expanded state during retrieval in the body, reducing the patient's pain and achieving the purpose of painless stent retrieval. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the overall longitudinal section of the recovery device;

[0023] Figure 2 This is a schematic diagram of the handle assembly in this solution;

[0024] Figure 3 This is a schematic diagram of the structure of the middle section of the recovery bracket device in this solution;

[0025] Figure 4 This is a schematic diagram of the structure of the end portion of the recovery stent device in this solution;

[0026] Figure 5 This is a schematic diagram of the bracket recovery in this plan.

[0027] Figure 6 This is a schematic diagram of the bracket being fully stored in this solution.

[0028] In the picture:

[0029] 1-Front handle; 2-Locking nut; 3-Rear handle; 4-Sheath; 5-Casing; 6-Bumper / Blocking block; 7-Expansion ring; 8-Hook; 9-Head assembly; 10-Pull line; 11-Inner core assembly; 12-Protective layer; 13-Stent to be recovered; 14-Release auxiliary line. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0031] The present invention provides a stent recovery device, see Figure 1 , including a handle assembly, a sleeve 5, an inner core assembly 11, a hook 8, an expansion collar 7 and a head assembly 9. The various components complement each other to form a stent recovery device, which can compress the implanted stent in the human body and smoothly recover the stent from the human body, thereby improving the efficiency and safety of the operation.

[0032] For details, see Figure 2 The handle assembly is the main control part of the device and is directly operated by the operator. The handle assembly is divided into two parts, front and back, and is composed of a front handle 1, a rear handle 3 and a locking nut 2.

[0033] Furthermore, the end of the front handle 1 is inserted into the rear handle 3, and the front handle 1 and the rear handle 3 cooperate with each other and can slide freely.

[0034] The outer end of the rear handle 3 is connected to the front end of the sleeve 5, preferably bonded in this solution, and they cooperate with each other to form a fixing member. When the bracket is recovered, it is held by the operator without movement.

[0035] There is a liquid injection port at the 3rd position of the rear handle, which can realize the liquid injection operation during operation and can be used for lubrication, flushing, etc.

[0036] Secondly, this device is for one-time use. If it needs to be used multiple times, the connection mode between the sleeve 5 and the rear handle 3 can be changed to a rotational fixation, which can be disassembled, cleaned and disinfected, so as to achieve the effect of multiple uses.

[0037] The locking nut 2 is installed at the interface between the front handle 1 and the rear handle 3. The locking nut 2 is used to fix the front handle 1 and the rear handle 3. When the device is to be used, the locking nut 2 can be loosened, and the front handle 1 and the rear handle 3 can slide relative to each other; when the device is not to be used, the locking nut 2 can be tightened, and the front handle 1 and the rear handle 3 are in a fixed state, which is convenient for placement.

[0038] A protective layer 12 is provided on the outside of the end of the sleeve 5 , which can reduce wear and tear of the sleeve 5 caused by friction.

[0039] The configuration of the protective layer 12 is not limited here, and it can be a metal ring or a coating, etc., and can be determined according to actual conditions.

[0040] The head assembly 9 is an independent assembly. When the device is stored under normal conditions, the head assembly 9 is used to seal the other end of the external sleeve 5 to prevent contamination.

[0041] The head assembly 9, the sleeve 5 and the rear handle 3 form the primary sterile barrier of the device, which is located at the two end ports of the sleeve 5, thereby effectively protecting the device from contamination.

[0042] The configuration of the head assembly 9 is not limited here, and it can be a plug or a pipe cap, etc., which can be determined according to actual conditions.

[0043] The traction line 10 is used to pull the hook to move. One end of the traction line 10 is connected to the end of the front handle 1, and the other end passes through the sleeve 5 and is connected to the metal hook 8.

[0044] The metal hook 8 is a rigid metal part, which is connected to the traction line 10. The traction line 10 drives the hook 8 to retract and retract under the drive of the operating handle and can adjust the position of the hook 8 relative to the release auxiliary line 14 accordingly, thereby ensuring the efficiency of the bracket 13 to be recovered.

[0045] Here, the release auxiliary line 14 is a component on the bracket, which is well known to those skilled in the art and will not be described in detail here.

[0046] The inner core assembly 11 is a hollow structure that is used for motion transmission and is located within the sleeve 5. A first impact block 62 is provided on the end of the inner core assembly 11 facing the operating handle to protect the inner core assembly 11 from damage caused by collision. The other end of the inner core assembly 11 is drivingly connected to the expansion ring 7, and the inner core assembly 11 can push the expansion ring 7 to move axially within the sleeve 5.

[0047] See also Figure 4 The expansion ring 7 is located in the sleeve 5, and the end facing the inner core component 11 is connected to the inner core component 11 by structural design.

[0048] The expansion ring 7 cooperates with the inner core component 11. The inner core component 11 can push one end of the expansion ring 7 out of the sleeve 5 by pushing the operating handle. At this time, the end of the expansion ring 7 extending out of the sleeve 5 is expanded.

[0049] The expanded state can be regarded as an extension of the sleeve 5 , and the diameter becomes larger, becoming a trumpet-shaped mouth 15 , which can facilitate the extension of the internal hook 8 and the recovery of the stent 13 to be recovered into the expansion ring 7 .

[0050] When retrieval is required, the handle assembly drives the traction line to move the expansion collar 7, hook 8, and the stent to be retrieved 13 slowly toward the cannula 5. After a certain movement, the hook 8 and the stent to be retrieved 13 are completely inserted into the expansion collar 7, and the bell-shaped end 15 of the expansion collar 7 completely wraps the stent to be retrieved 13 and the hook 8 due to the compression of the cannula 5. Then, the handle assembly is operated, and the traction line drives the already wrapped expansion collar 7 and the inner core assembly 11 to move and retract within the cannula 5. This design prevents secondary damage to the patient when the stent to be retrieved 13 is removed from the patient's body.

[0051] The expansion snare 7 here is preferably made of nickel-titanium alloy with memory properties and can be deformed.

[0052] During the aforementioned recovery, a specific travel distance can be achieved by providing a limiting assembly within the expansion collar 7. The limiting assembly comprises a first blocking block 64 and a second blocking block 63. The first blocking block 64 is located at the end of the expansion collar 7 facing the inner core assembly 11; the second blocking block 63 is located on the pull line 10 within the expansion collar 7, corresponding to the first blocking block 64. The collision between the first blocking block 64 and the second blocking block 63 causes the expansion collar 7 and the inner core assembly 11 to retract together.

[0053] Secondly, see Figure 3 A sheath 4 may also be provided in the stent recovery device. The sheath 4 is used to increase the proximal extent of the device and is a hollow structure. The sheath 4 is located in the sleeve 5. One end of the sheath 4 is connected to the front handle 1 of the operating handle, and the other end is arranged facing the inner core component 11.

[0054] In addition, a second collision block 61 is provided at the end of the sheath tube 4 facing the inner core assembly 11 to protect the sheath tube 4 from damage caused by collision.

[0055] In this solution, the sheath tube 4 is a hollow tube made of metal or low elastic polymer material. The sheath tube 4 is an optional accessory and can be selected without processing according to actual conditions.

[0056] In addition, there are some auxiliary components in this device, which are used to connect the various components, realize transmission and increase the durability of the device, such as nut components or protective films, etc. There is no limitation here and it can be determined according to actual conditions.

[0057] The following examples illustrate its working process in specific applications.

[0058] See also Figure 5First, when the device is used, remove the head assembly 9, loosen the locking nut 2, fix the rear handle 3, and then push the front handle 1 to sequentially drive the traction line 10, the inner core assembly 11, and the expansion ring 7 to move axially within the casing 5 until there is no longer any movement distance between the front handle 1 and the rear handle 3. At this time, one end of the expansion ring 7 will be pushed out of the casing 5 and the end will expand into a bell mouth 15. At this time, the hook 8 will be extended from the expansion ring 7 due to the push of the traction line 10. By turning the operating handle and the real-time transmission of the traction line 10, the hook 8 is rotated to adjust the position of the hook 8 and the release auxiliary line 14 to facilitate hooking the bracket 13 to be recovered.

[0059] During the process of stent recovery, the operating handle is retracted, and the traction line 10 is driven to drive the hook 5 and the stent to be recovered 13 to move toward the trumpet 15 end of the expansion ring 7 at the same time; until the second obstacle block 64 on the traction line 10 collides with the first obstacle block 63 on the expansion ring 7, the hook 8 and the stent to be recovered 13 are completely entered into the expansion ring 7 and the trumpet end 15 of the expansion ring 7 is completely wrapped around the stent to be recovered 13 and the hook 8 due to the compression of the sleeve 5; then the operating handle assembly is operated, the traction line 10 will drive the already wrapped expansion ring 7, and the inner core assembly 11 moves together toward the operating handle to realize the function of painless recovery of the stent in the body.

[0060] A stent recovery device constructed by the above-mentioned scheme utilizes a hook to pull the stent for recovery, and can store the stent into a device with a smaller diameter in the body, thereby avoiding unnecessary damage to the cavity mucosa caused by the stent being in an expanded state during recovery in the body, reducing the patient's pain, simplifying the operation difficulty of medical staff, and achieving the purpose of painless stent recovery; in addition, this device adopts a deformable opening design, which has a simple structure, is easy to process, and has high feasibility.

[0061] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A stent recovery device, characterized in that: It includes a handle assembly, a sleeve, an inner core assembly, a hook, a traction line, and an expansion ring; the handle assembly is arranged in conjunction with the sleeve, and the handle assembly includes a front handle and a rear handle; the end of the front handle is inserted into the interior of the rear handle, and the end is connected to the traction line; the outside of the rear handle is fixedly connected to the sleeve; The inner core assembly is movably arranged in the sleeve, and the expansion collar is movably arranged in the sleeve and is located between the inner core assembly and the end of the sleeve; a limit assembly is provided between the expansion collar and the traction line, and the limit assembly can synchronously drive the expansion collar in the extended and expanded state to move and retract the end of the sleeve after the traction line moves and retracts the end of the sleeve for a certain distance; the limit assembly comprises a first blocking block and a second blocking block; the first blocking block is provided on the expansion collar; the second blocking block is provided on the traction line located in the expansion collar corresponding to the first blocking block; One end of the traction line is connected to the handle assembly, and the other end passes through the inner core assembly and the expansion ring in sequence to connect the hook; The handle assembly can drive the pulling line to drive the hook to extend out of the end of the sleeve, and after a certain movement stroke, drive the inner core assembly to move toward the expansion ring until the inner core assembly drives the end of the expansion ring to extend out of the sleeve, and the end of the expansion ring extending out of the sleeve can automatically expand into a trumpet shape; The handle assembly can drive the traction line to drive the hook to retract the end of the sleeve, and after a certain movement stroke, synchronously drive the expansion ring to retract the end of the sleeve. The end of the expansion ring in the expanded state can be retracted and restored under the compression of the sleeve end.

2. A stent recovery device according to claim 1, characterized in that: The handle assembly also includes a locking assembly, which is arranged between the front handle and the rear handle.

3. The stent recovery device according to claim 1, characterized in that: The inner core component is a hollow structure, and a first collision block is provided on the end facing the operating handle to protect the inner core component from collision and damage.

4. The stent recovery device according to claim 1, characterized in that: A sheath is also provided in the stent recovery device; one end of the sheath is connected to the front handle of the operating handle, and the other end is arranged facing the inner core component.

5. The stent recovery device according to claim 4, characterized in that: The end of the sheath tube facing the inner core assembly is provided with a second collision block for protecting the sheath tube from collision damage.

6. The stent recovery device according to claim 1, characterized in that: A protective layer is provided on the outer side of the distal end of the sleeve for reducing wear and tear of the sleeve.

7. The stent recovery device according to claim 1, characterized in that: The end port of the cannula is provided with a head assembly for sealing the outer cannula.

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