Digestive tract stent retrieval apparatus and sleeve for endoscope

Abstract

The present disclosure relates to the field of medical instruments, and provides a digestive tract stent retrieval apparatus and a sleeve for an endoscope. The digestive tract stent retrieval apparatus comprises a detachable handle, a tube body, a trumpet-shaped protective sleeve, and an endoscope retrieval cap configured to be mounted on a distal end of an endoscope. Two ends of the tube body are a first connection end and a second connection end, respectively. The first connection end is connected to the detachable handle, and the second connection end is connected to the trumpet-shaped protective sleeve. The inner diameter of the second connection end is greater than the inner diameter of the tube body. The endoscope retrieval cap is trumpet-shaped. The endoscope retrieval cap extends out of the tube body and, under a pulling force, carries a digestive tract stent into the tube body. The present disclosure can reduce the risk of upper digestive tract injury during stent removal, improve treatment safety, and allow separation of the stent and the retrieval apparatus using the detachable handle after stent removal.

Description

A digestive tract stent recovery device and an endoscope cannula

[0001] Cross-reference to Related Applications

[0002] The present disclosure claims the priority of the Chinese patent publication No. 2024106183086 entitled "A digestive tract stent recovery device and an endoscope cannula" filed on May 17, 2024 with the China Patent Office, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the field of medical devices, in particular, to a digestive tract stent recovery device and an endoscope cannula. BACKGROUND

[0004] With the development of society and the improvement of living standards, obesity and diabetes have become a growing health problem worldwide. Currently, the treatment methods for weight loss and diabetes mainly include drug therapy, diet control and surgery, etc. Among them, surgery is an effective treatment method, but the operation risk is large, and it causes irreversible damage to the physiological structure of the human body and postoperative complications. Therefore, it is of great significance to find a safe and effective non-surgical treatment method.

[0005] In recent years, the duodenojejunal endoscopic sleeve placement technology has achieved remarkable results in weight loss and diabetes treatment. This technology fixes the proximal end of the sleeve with a stent, and then places a sleeve between the duodenum and the jejunum to restrict food digestion and absorption, thereby achieving weight loss and reducing blood sugar. Since the stent needs to be fixed on the upper end of the duodenum to configure a fixed sleeve to prevent the sleeve from falling off, in order to better fix it, the stent is often designed with an anchor structure to prevent its own displacement. However, this structure poses a great challenge to the recovery of the stent.

[0006] In the current recovery method, the stent is usually pulled out of the digestive tract by physical force. Since the stent fixed by the duodenojejunal endoscopic sleeve placement often has a structure designed to prevent displacement, such as spikes and blades, this direct recovery operation relying on physical force can injure the digestive tract wall during the recovery process, causing bleeding, perforation and other serious complications. Currently, this technology has problems such as upper gastrointestinal tract injury during stent removal, which poses certain risks to patients. In addition, since this type of product is an implanted product, research on clinical removal is often needed to achieve continuous improvement and design upgrade of the product. However, the current recovery method is to discard it as waste, which cannot be separated and further studied.

[0007] In view of this, the present disclosure is proposed.

[0008] SUMMARY

[0009] The purposes of the present disclosure include, for example, providing a digestive tract stent recovery device and an endoscope cannula, which can reduce the risk of upper digestive tract injury during stent removal, improve treatment safety, and facilitate separation of the stent and the recovery device after the stent is removed.

[0010] Embodiments of the present disclosure can be implemented as follows:

[0011] In a first aspect, the present disclosure provides a digestive tract stent recovery device, comprising a detachable handle, a tube body, a horn-shaped protective sleeve, and an endoscope recovery cap configured to be mounted at the tip of an endoscope, wherein two ends of the tube body are a first connecting end and a second connecting end, respectively, the first connecting end is connected with the detachable handle, the second connecting end is connected with the horn-shaped protective sleeve, the inner diameter of the second connecting end is larger than the inner diameter of the tube body, the endoscope recovery cap is horn-shaped, the endoscope recovery cap extends out of the tube body and carries the digestive tract stent into the tube body under the action of tension.

[0012] Optionally, the inner taper angle of the endoscope recovery cap is smaller than the inner taper angle of the horn-shaped protective sleeve.

[0013] Optionally, the inner taper angle of the endoscope recovery cap is 25°-40°.

[0014] Optionally, the inner taper angle of the horn-shaped protective sleeve is 30°-50°.

[0015] Optionally, the length of the endoscope recovery cap is 2mm-10mm shorter than the length of the horn-shaped protective sleeve.

[0016] Optionally, the minimum diameter of the endoscope recovery cap is 4mm-8mm smaller than the minimum diameter of the horn-shaped protective sleeve.

[0017] Optionally, the hardness of the endoscope recovery cap is 30-75A, and the thickness is 0.4-1.8mm.

[0018] Optionally, the inner diameter of the tube body is 10-19mm, and the outer diameter is 12-21mm, and when the second connecting end is connected with the tube body, the inner diameter of the second connecting end is 0.1-4mm larger than the inner diameter of the tube body.

[0019] Optionally, the materials of the horn-shaped protective sleeve and the endoscope recovery cap both include one of silicone and polyurethane.

[0020] Optionally, a first hydrophilic coating is arranged on the inner wall of the horn-shaped protective sleeve and the outer wall of the endoscope recovery cap, and the curing mode of the first hydrophilic coating is photocuring.

[0021] Optionally, the photocuring time is 1-15min.

[0022] Optionally, the material of the trumpet-shaped protective sleeve and the endoscope recovery cap respectively comprises one of silicone and polyurethane.

[0023] Optionally, a second hydrophilic coating is arranged on the inner wall of the tube body, and the curing mode of the second hydrophilic coating is thermal curing.

[0024] Optionally, the thermal curing temperature of the thermal curing is 50-70℃, and the curing time is 10-120min; preferably 40-80min.

[0025] Optionally, the detachable handle comprises a handle body, a handle cover and a sealing ring, one end of the handle body is detachably connected with the handle cover, the other end is fixedly connected with the tube body, and the sealing ring is arranged between the handle cover and the handle body.

[0026] Optionally, the recovery force for pulling the digestive tract stent into the endoscope recovery cap is not greater than 40N; preferably less than 30N.

[0027] In a second aspect, the disclosure provides a cannula for an endoscope, which comprises the digestive tract stent recovery device according to any one of the preceding embodiments.

[0028] The beneficial effects of the embodiments of the disclosure include, for example:

[0029] The disclosure provides a digestive tract stent recovery device, which protects the captured digestive tract stent by using an endoscope recovery cap, so that the captured digestive tract stent can cross the pylorus under protection, avoiding damage to the pylorus during recovery. After reaching the stomach, under the lubricating action of the hydrophilic coating, the endoscope recovery cap carrying the digestive tract stent enters the trumpet-shaped protective sleeve, the trumpet-shaped protective sleeve provides a second protection, greatly reduces the force value for pulling into the cannula, the recovery force is not greater than 40N, which can maximize the protection of the cardia (avoiding damage to the cardia), and the digestive tract stent can be pulled into the tube body under the protection of the tube body, avoiding damage to the esophagus during withdrawal from the body. In addition, the detachable handle can be separated after the digestive tract stent is withdrawn from the body, which is convenient for taking out the stent for subsequent research, continuous product upgrading and iteration to improve the adverse reactions of subsequent products. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a structural schematic view of the digestive tract stent recovery device provided by the disclosure when the endoscope recovery cap is not installed;

[0031] FIG. 2 is an exploded view of the digestive tract stent recovery device provided by the disclosure;

[0032] Fig. 3 is a structural schematic diagram of an endoscope recovery cap of the digestive tract stent recovery device provided by the present disclosure;

[0033] Fig. 4 is an assembly diagram of the digestive tract stent recovery device in a working state provided by the present disclosure;

[0034] Fig. 5 is a human model used when the digestive tract stent recovery device provided by the present disclosure is experimented.

[0035] Fig. 1 is a structural schematic diagram of a digestive tract stent recovery device provided by the present disclosure. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts are within the scope of protection of the present disclosure.

[0038] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present disclosure, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present disclosure.

[0040] In addition, if the terms "first", "second" and the like appear, they are only configured to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] It should be noted that the features in the embodiments of the present disclosure can be combined with each other without conflict.

[0042] Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the present disclosure provides a digestive tract stent recovery device 100, which comprises a detachable handle 110, a tube body 120, a horn-shaped protective sleeve 130 and an endoscope recovery cap 140 configured to be mounted on the tip of an endoscope.

[0043] In the present disclosure, the tube body 120 is a hollow tubular structure, and the two ends of the tube body 120 are respectively a first connecting end 121 and a second connecting end 122. The first connecting end 121 is connected with the detachable handle 110, and the second connecting end 122 is connected with the horn-shaped protective sleeve 130. The detachable handle 110 is detachable by itself, so that the digestive tract stent recovery device 100 is easy to disassemble after use, thereby facilitating the removal of the recovered digestive tract stent inside for subsequent research.

[0044] In the present embodiment, the inner diameter of the second connecting end 122 is larger than the inner diameter of the tube body 120. The inner diameter of the tube body 120 is 10-19 mm, and the outer diameter is 12-21 mm. When the second connecting end 122 is connected with the tube body 120, the inner diameter of the second connecting end 122 is 0.1-4 mm larger than the inner diameter of the tube body 120. In the present embodiment, the inner diameter of the second connecting end 122 is expanded, which facilitates the insertion of the horn-shaped protective sleeve 130 into the second connecting end 122. Specifically, the horn-shaped protective sleeve 130 comprises a connecting column 131 and a horn sleeve 132 connected with each other, and the connecting column 131 is bonded to the inner side of the second connecting end 122. Through the above design, there is no step between the end of the horn-shaped protective sleeve 130 (i.e. the position of the connecting column 131) and the tube body 120, which avoids the situation that the digestive tract stent is stuck.

[0045] The endoscope recovery cap 140 is horn-shaped. When the digestive tract stent recovery device 100 is installed, the endoscope 200 is first inserted into the tube body 120 until it passes through the horn-shaped protective sleeve 130, and then the endoscope recovery cap 140 is installed on the tip of the endoscope 200. When working, the endoscope grasps the digestive tract stent, and then pulls the digestive tract stent into the endoscope recovery cap 140. The endoscope recovery cap 140 can wrap the digestive tract stent to avoid its puncturing the wall of the digestive tract. After being wrapped by the endoscope recovery cap 140, the digestive tract stent is pulled out along the direction of the horn-shaped protective sleeve 130 to the detachable handle 110.

[0046] In the present disclosure, the endoscope recovery cap 140 protects the grasped digestive tract stent, so that the grasped digestive tract stent crosses the pylorus under protection, avoiding damage to the pylorus during the recovery process. At the same time, the opening of the horn-shaped protective sleeve 130 facilitates the entry of the endoscope recovery cap 140 carrying the digestive tract stent, thereby facilitating the pulling into the tube body 120.

[0047] In the present disclosure, the structure of the endoscope recovery cap 140 and the horn-shaped protective sleeve 130 is strictly controlled, wherein the inner taper angle of the endoscope recovery cap 140 is smaller than the inner taper angle of the horn-shaped protective sleeve 130; optionally, the inner taper angle of the endoscope recovery cap 140 is 25°-40°; the inner taper angle of the horn-shaped protective sleeve 130 is 30°-50°. By controlling the inner taper angles of the endoscope recovery cap 140 and the horn-shaped protective sleeve 130, the opening of the horn-shaped protective sleeve 130 is larger than the opening of the endoscope recovery cap 140, which facilitates the entry of the endoscope recovery cap 140 into the horn-shaped protective sleeve 130.

[0048] In addition, in the present disclosure, the length of the endoscope recovery cap 140 is 2-10 mm smaller than the length of the horn-shaped protective sleeve 130; the minimum diameter of the endoscope recovery cap 140 is 4-8 mm smaller than the minimum diameter of the horn-shaped protective sleeve 130. By controlling the lengths and minimum diameters of the endoscope recovery cap 140 and the horn-shaped protective sleeve 130, the endoscope recovery cap 140 can be completely wrapped by the horn-shaped protective sleeve 130, which facilitates the entry of the endoscope recovery cap 140 into the horn-shaped protective sleeve 130. Further, in the present disclosure, the hardness of the endoscope recovery cap 140 is 30-75A, and the thickness is 0.4-1.8 mm; the endoscope recovery cap 140 is prepared by selecting a material with moderate hardness and thickness, so that it has a certain elasticity and hardness, which facilitates the wrapping of the digestive tract stent to be recovered.

[0049] Further, in the present disclosure, the inner wall of the tube body 120, the inner wall of the horn-shaped protective sleeve 130, and the outer wall of the endoscope recovery cap 140 are all provided with a hydrophilic coating; the hydrophilic coating includes but is not limited to a PVP coating; optionally, the hydrophilic coating can select different curing methods according to the surface material it coats, such as thermal curing or photocuring; wherein the thermal curing temperature of thermal curing is 50-70℃, and the curing time is 10-120 min; preferably 40-80 min; the photocuring time is 1-15 min.

[0050] Specifically, the material of the tube body 120 includes but is not limited to one or more of polyvinyl chloride, silicone, polyurethane, nylon, and polyethylene; the curing method of the hydrophilic coating on the tube body 120 is thermal curing; the materials of the horn-shaped protective sleeve 130 and the endoscope recovery cap 140 respectively include but are not limited to one of silicone and polyurethane; the curing method of the hydrophilic coating on the horn-shaped protective sleeve 130 and the endoscope recovery cap 140 is photocuring.

[0051] The present disclosure can realize that the recovery force of the digestive tract stent pulled into the endoscope recovery cap 140 is not greater than 40N; preferably less than 30N, through the above-mentioned double-structure protection and the setting of the hydrophilic coating. The force value pulled into the sleeve is greatly reduced, which can maximize the protection of the cardiac part (avoiding cardiac injury).

[0052] In addition, the detachable handle 110 in the present disclosure comprises a handle body 111, a handle cover 112 and a sealing ring 113, one end of the handle body 111 is detachably connected with the handle cover 112, and the other end is fixedly connected with the tube body 120, and the sealing ring 113 is arranged between the handle cover 112 and the handle body 111. After the digestive tract stent is withdrawn from the body, the detachable structure design between the handle body 111 and the handle cover 112 is used to separate the detachable handle 110, so that the stent can be taken out for subsequent research, continuous product upgrading and iteration to improve the adverse reactions of subsequent products.

[0053] It should be understood that the detachable structure design in the present disclosure is not limited to the detachable handle 110 itself, as long as the recovered digestive tract stent can be taken out from the digestive tract stent recovery device 100, for example, the connection between the detachable handle 110 and the tube body 120 can also be designed to be detachable.

[0054] In addition, the present disclosure also provides a cannula for an endoscope, which comprises the above-mentioned digestive tract stent recovery device 100.

[0055] The technical solutions of the present disclosure are further described below in combination with specific embodiments.

[0056] Embodiment 1

[0057] The present embodiment provides a digestive tract stent recovery device 100, which comprises a detachable handle 110, a tube body 120, a horn-shaped protective sleeve 130 and an endoscope recovery cap 140 configured to be mounted on the front end of an endoscope 200.

[0058] The detachable handle 110 comprises a handle body 111, a handle cover 112 and a sealing ring 113, one end of the handle body 111 is detachably connected with the handle cover 112, and the other end is fixedly connected with the tube body 120, and the sealing ring 113 is arranged between the handle cover 112 and the handle body 111.

[0059] The inner diameter of the tube body 120 is 14 mm, the outer diameter is 16 mm, the outer diameter of the second connecting end 122 is 16 mm, and the inner diameter of the second connecting end 122 after being connected with the horn-shaped protective sleeve 130 is 14 mm.

[0060] The horn-shaped protective sleeve 130 is horn-shaped, the length is 38 mm, the inner diameter at the minimum diameter of the horn-shaped protective sleeve 130 is 14 mm, and the inner taper angle of the horn-shaped protective sleeve 130 is 37°.

[0061] The endoscope recovery cap 140 is horn-shaped, the length is 28 mm, the outer diameter at the minimum outer diameter of the endoscope recovery cap 140 is 12 mm, the inner taper angle of the endoscope recovery cap 140 is 32°, the hardness of the silicone of the endoscope recovery cap 140 is 35A, and the wall thickness is 1.2 mm.

[0062] The material of the pipe body 120 is polyvinyl chloride, the materials of the sealing ring 113, the trumpet-shaped protective sleeve 130 and the endoscope recovery cap 140 are silica gel, a hydrophilic coating (PVP coating) is arranged on the inner wall of the pipe body 120, the inner wall of the trumpet-shaped protective sleeve 130 and the outer wall of the endoscope recovery cap 140, the internal hydrophilic coating of the pipe body 120 is cured by heat curing, the heat curing temperature is 60°C, and the curing time is 50 min; the endoscope recovery cap 140 and the trumpet-shaped protective sleeve 130 are cured by light curing, and the light curing time is 5 min.

[0063] Example 2

[0064] The present example is basically the same as example 1, the difference is that in the present example, the wall thickness of the endoscope recovery cap 140 is 0.4 mm.

[0065] Example 3

[0066] The present example is basically the same as example 1, the difference is that in the present example, the silica gel hardness of the endoscope recovery cap 140 is 60A, and the wall thickness is 1 mm.

[0067] Example 4

[0068] The present example is basically the same as example 1, the difference is that in the present example, the trumpet-shaped protective sleeve 130 is trumpet-shaped, the length is 38 mm, the inner diameter at the minimum diameter of the trumpet-shaped protective sleeve 130 is 14 mm, and the inner taper angle of the trumpet-shaped protective sleeve 130 is 40°. The endoscope recovery cap 140 is trumpet-shaped, the length is 32 mm, the outer diameter at the minimum outer diameter of the endoscope recovery cap 140 is 12 mm, and the inner taper angle of the endoscope recovery cap 140 is 35°.

[0069] Example 5

[0070] The present example is basically the same as example 1, the difference is that in the present example, the trumpet-shaped protective sleeve 130 is trumpet-shaped, the length is 38 mm, the inner diameter at the minimum diameter of the trumpet-shaped protective sleeve 130 is 14 mm, and the inner taper angle of the trumpet-shaped protective sleeve 130 is 40°. The endoscope recovery cap 140 is trumpet-shaped, the length is 35 mm, the outer diameter at the minimum outer diameter of the endoscope recovery cap 140 is 10 mm, and the inner taper angle of the endoscope recovery cap 140 is 35°.

[0071] Comparative Example 1

[0072] The comparative example is basically the same as example 1, the only difference is that in the comparative example, the inner diameter of the second connecting end 122 after being connected with the trumpet-shaped protective sleeve 130 is consistent with the inner diameter of the tube body 120. Specifically, in the comparative example, the inner diameter of the tube body 120 is 12 mm, the outer diameter is 14 mm, the diameter of the second connecting end 122 is 16 mm, and the inner diameter of the second connecting end 122 after being connected with the trumpet-shaped protective sleeve 130 is 12 mm.

[0073] Comparative Example 2

[0074] The comparative example is basically the same as example 1, the only difference is that in the comparative example, the inner wall of the tube body 120, the inner wall of the trumpet-shaped protective sleeve 130, and the outer wall of the endoscope recovery cap 140 are not provided with a hydrophilic coating.

[0075] Comparative Example 3

[0076] The comparative example is basically the same as example 1, the only difference is that in the comparative example, the trumpet-shaped protective sleeve is not provided.

[0077] Comparative Example 4

[0078] The comparative example is basically the same as example 1, the only difference is that in the comparative example, the endoscope recovery cap is not provided.

[0079] Experimental Example

[0080] The digestive tract stent recovery device 100 of examples 1-5 and comparative examples 1-4 is used, the endoscope 200 is first inserted into the tube body 120 to pass through the trumpet-shaped protective sleeve 130 completely, and then the endoscope recovery cap 140 is installed at the tip of the endoscope 200 (in the comparative example 4, the endoscope recovery cap 140 is not provided, i.e. the endoscope recovery cap 140 does not need to be installed), a human body model is used, as shown in FIG. 5, and the endoscope is inserted into the stomach through the human body model mouth, then the tube body 120 and the detachable handle 110 reserved outside the body are fixed, and the endoscope is pushed to the pylorus. The recovery grabber for endoscope is inserted into the mirror forceps channel of the endoscope, the digestive tract stent to be recovered is reduced and pulled into the protection range of the endoscope recovery cap 140, and then the endoscope is withdrawn to the vicinity of the trumpet-shaped protective sleeve 130 in the stomach. Then the digestive tract stent to be recovered is pulled into the tube body 120, and the maximum force value F of pulling into the tube body 120 is recorded. Through repeated tests for 15 times, the success rate of each time is calculated, and whether there is a scratch in the esophagus / intestine is observed.

[0081] From the above table, it can be seen that during the simulation of use, examples 1-5 can all form good protection for the esophagus and intestines, and the recovery force is less than 20N. When the second end of the tube is connected and the diameter of the tube is the same (comparative example 1), the recovery force will increase significantly due to the inability to form a good guide. When there is no hydrophilic coating, the surface friction increases, resulting in a significant increase in the recovery force. At the same time, when there is no horn-shaped protective sleeve, although the recovery force is not large, due to the lack of the guiding effect of the horn-shaped protective sleeve, the recovery cap with the stent cannot be pulled into the recovery tube at one time. In addition, when there is no recovery cap, it will cause a certain degree of damage to the intestines.

[0082] In summary, the disclosed embodiment provides a digestive tract stent recovery device 100, which uses an endoscope recovery cap 140 to protect the captured digestive tract stent, allowing the captured digestive tract stent to pass through the pylorus under protection, avoiding damage to the pylorus during the recovery process, and then reaching the stomach. Under the lubricating effect of the hydrophilic coating, the second connecting end 122 and the horn-shaped protective sleeve 130 are specially designed to facilitate the entry of the endoscope recovery cap 140 carrying the digestive tract stent into the horn-shaped protective sleeve 130, which realizes the second protection of the horn-shaped protective sleeve 130, greatly reduces the force value of pulling into the sleeve, and the recovery force is not greater than 40N, which can maximize the protection of the cardia (avoiding damage to the cardia), and the cardia is pulled into the tube body 120, which can avoid damage to the esophagus during the withdrawal of the digestive tract stent from the body. In addition, the disclosed embodiment has a detachable handle 110 that can be detached, which can be separated after the digestive tract stent is withdrawn from the body, facilitating the removal of the stent for subsequent research, continuous product upgrading and iteration to improve the adverse reactions of subsequent products.

[0083] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed by the present disclosure can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims. Industrial applicability

[0084] The digestive tract stent recovery device provided by the disclosure utilizes an endoscope recovery cap to protect the grasped digestive tract stent, so that the grasped digestive tract stent crosses the pylorus under protection, avoids damage to the pylorus during recovery, and after reaching the stomach, under the lubricating action of a hydrophilic coating, the endoscope recovery cap carrying the digestive tract stent enters a horn-shaped protective sleeve by virtue of the special design of the second connecting end and the horn-shaped protective sleeve, the horn-shaped protective sleeve realizes second protection, greatly reduces the force value of pulling into the sleeve, the recovery force is not greater than 40 N, the cardia part can be protected to the greatest extent (avoiding damage to the cardia), and the digestive tract stent is pulled into the tube body, and under the protection of the tube body, the esophagus can be prevented from being damaged during withdrawal from the body.

Claims

1. A digestive tract stent retrieval device, characterized by, The device comprises a detachable handle, a tube body, a trumpet-shaped protective sleeve and an endoscope recovery cap configured to be mounted on the tip of an endoscope, two ends of the tube body are respectively a first connecting end and a second connecting end, the first connecting end is connected with the detachable handle, the second connecting end is connected with the trumpet-shaped protective sleeve, the inner diameter of the second connecting end is larger than the inner diameter of the tube body, the endoscope recovery cap is trumpet-shaped, the endoscope recovery cap extends out of the tube body and carries a digestive tract stent into the tube body under the action of tension.

2. The digestive tract stent retrieval device of claim 1, wherein, The inner taper angle of the endoscope recovery cap is smaller than the inner taper angle of the trumpet-shaped protective sleeve. Optionally, the inner taper angle of the endoscope recovery cap is 25°-40°. Optionally, the inner taper angle of the trumpet-shaped protective sleeve is 30°-50°.

3. The digestive tract stent-retrieving device according to claim 1, wherein The length of the endoscope recovery cap is 2mm-10mm shorter than the length of the trumpet-shaped protective sleeve. Optionally, the minimum diameter of the endoscope recovery cap is 4mm-8mm smaller than the minimum diameter of the trumpet-shaped protective sleeve.

4. The digestive tract stent-retrieving device according to claim 1, wherein The hardness of the endoscope recovery cap is 30-75A and the thickness is 0.4-1.8mm.

5. The digestive tract stent-retrieving device according to claim 1, wherein The inner diameter of the tube body is 10-19mm and the outer diameter is 12-21mm, and when the second connecting end is connected with the tube body, the inner diameter of the second connecting end is 0.1-4mm larger than the inner diameter of the tube body.

6. The digestive tract stent-retrieving device according to claim 1, wherein The material of the tube body comprises one or more of polyvinyl chloride, silicone, polyurethane, nylon and polyethylene. Optionally, a first hydrophilic coating is provided on the inner wall of the trumpet-shaped protective sleeve and the outer wall of the endoscope recovery cap, and the solidification mode of the first hydrophilic coating is photocuring. Optionally, the photocuring time is 1-15min.

7. The device of claim 6, wherein the device is configured to be inserted into the patient's body through the patient's mouth. The materials of the trumpet-shaped protective sleeve and the endoscope recovery cap respectively comprise one of silicone and polyurethane. Optionally, a second hydrophilic coating is provided on the inner wall of the tube body, and the solidification mode of the second hydrophilic coating is thermal curing. Optionally, the thermal curing temperature of the thermal curing is 50-70℃, and the curing time is 10-120min; preferably 40-80min.

8. The digestive tract stent-retrieving device according to claim 1, wherein The detachable handle comprises a handle body, a handle cover and a sealing ring, one end of the handle body is detachably connected with the handle cover, the other end is fixedly connected with the tube body, and the sealing ring is arranged between the handle cover and the handle body.

9. The digestive tract stent-retrieving device according to claim 1, wherein The recovery force for pulling the digestive tract stent into the endoscope recovery cap is not greater than 40N; preferably less than 30N.

10. A cannula for an endoscope, characterized by The device comprises the digestive tract stent recovery device according to any one of claims 1-9.

Images