Device for taking out foreign matters in body

Abstract

The invention discloses an in-vivo foreign body taking-out device, and relates to the technical field of medical instruments. The in-vivo foreign matter taking-out device comprises a fixing cylinder, a capturing net bag and a plurality of supporting pieces. The multiple supporting pieces are arranged at intervals in the circumferential direction of the fixing cylinder and connected to the far end of the fixing cylinder, a capturing channel allowing foreign matter to enter is defined between every two adjacent supporting pieces, and the circumferential distance between every two adjacent supporting pieces is adjustable; the catching net bag is connected to the far ends of the multiple supporting pieces and used for catching foreign matter entering through the catching channel. According to the foreign matter catching device, the catching channel allowing the foreign matter to enter is defined by the two adjacent supporting pieces, so that large foreign matter can enter conveniently, then the catching net bag is used for holding the foreign matter so that the foreign matter can be taken out conveniently, and in addition, the risk that the foreign matter breaks away from the catching channel can be reduced by adjusting the circumferential distance between the two supporting pieces.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a device for removing foreign bodies in vivo. Background Art

[0002] In order to remove foreign bodies such as stones in the human lumen or organ, in related technologies, a foreign body basket is transported in the lumen or organ, and the expansion and contraction of the foreign body basket are used to capture and remove the foreign body.

[0003] The foreign body basket in related technologies is woven from materials such as metal wires with a small diameter. In order to be able to expand smoothly after entering the lumen or organ and reduce the deformation of the foreign body basket after expansion, the foreign body basket in related technologies is usually designed with a large grid density and a small grid size to provide better support force. However, it is difficult for the foreign body basket in this structural form to capture larger foreign bodies. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, the present invention provides a device for removing foreign bodies in vivo.

[0005] An embodiment of the present invention provides a device for removing foreign bodies in vivo, including a fixed cylinder, a capture net pocket, and a plurality of support members; the plurality of support members are arranged at intervals along the circumference of the fixed cylinder and connected to the distal end of the fixed cylinder, and a capture channel for foreign bodies to enter is defined between adjacent two of the support members, and the circumferential distance between adjacent two of the support members is adjustable; the capture net pocket is connected to the distal ends of the plurality of support members and is used to hold the foreign bodies entering through the capture channel.

[0006] In some embodiments of the present invention, the capture net pocket includes connecting arms and a special-shaped member. A plurality of the connecting arms are provided at the distal ends of each of the support members, and the plurality of connecting arms of the plurality of support members are respectively connected to the special-shaped member. An adjacent two of the connecting arms on the same support member and the special-shaped member define a first capture hole, and the special-shaped member is provided with a second capture hole with an adjustable size. The special-shaped member is configured to adjust the distance between adjacent two of the connecting arms on the same support member to adjust the size of the second capture hole.

[0007] In some embodiments of the present invention, the special-shaped member includes a plurality of adjusting portions that are sequentially connected end to end along the circumference and define the second capture hole. The plurality of connecting arms of the plurality of support members are respectively connected to the plurality of adjusting portions in one-to-one correspondence. The adjusting portion is provided with an adjusting space communicating with the second capture hole. The special-shaped member is configured to adjust the distance between adjacent two of the connecting arms on the same support member to adjust the size of the adjusting space, so as to adjust the size of the second capture hole.

[0008] In some embodiments of the present invention, the adjustment portion includes a first part and a second part, the first part includes opposite first and second ends, the second part includes opposite third and fourth ends, the first end and the third end are connected and are respectively connected to the same connecting arm, the second end and the fourth end are spaced apart so that the first part and the second part enclose the adjustment space, the second end is used to connect the fourth end of the second part of the adjacent adjustment portion, and the fourth end is used to connect the second end of the first part of the adjacent adjustment portion.

[0009] In some embodiments of the present invention, the first end is a first arc end, the third end is a second arc end, the first arc end and the second arc end are integrally connected to enclose the third arc end, and the first part excluding the first arc end and the second part excluding the second arc end are arranged at an angle.

[0010] In some embodiments of the present invention, the circumferential spacing between two adjacent connecting arms of each support member gradually increases from the proximal end to the distal end of the support member, and the distal end of the connecting arm is a curved shape that is concave in the direction away from the second capture hole.

[0011] In some embodiments of the present invention, along the circumference of the capture net bag, the connecting arm on each support member is connected to the connecting arm on another adjacent support member, and together with the special-shaped member, forms a third capture hole.

[0012] In some embodiments of the present invention, from the proximal end to the distal end of the support member, the radial distance between each support member and the axis of the fixing tube first gradually increases and then gradually decreases.

[0013] In some embodiments of the present invention, the support member and the capturing net bag are respectively made of elastic materials.

[0014] In some embodiments of the present invention, the support member and the capture net bag are an integral piece.

[0015] The device for removing foreign matter from the body provided by the present invention has the following beneficial effects: The in-vivo foreign body removal device is designed to include a fixed cylinder, a capture net pocket, and multiple support members; a capture channel for foreign bodies to enter is defined by two adjacent support members, facilitating the entry of larger foreign bodies. Then, the capture net pocket catches the foreign bodies that enter through the capture channel, and as the entire lumen foreign body moves outward, the larger foreign bodies are removed. In addition, the circumferential distance between the two support members can be adjusted to reduce the distance between the two support members, thereby reducing the risk of foreign bodies detaching from the capture channel. This not only enables the rapid capture of larger foreign bodies but also reduces the possibility of foreign bodies detaching from the foreign body removal device during the capture and foreign body removal processes. Description of the Drawings

[0016] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 is a schematic structural diagram of the first in-vivo foreign body removal device provided by an embodiment of the present application from one perspective; Figure 2 is a schematic structural diagram of the first in-vivo foreign body removal device provided by an embodiment of the present application from another perspective; Figure 3 is a schematic structural diagram of the first in-vivo foreign body removal device provided by an embodiment of the present application from yet another perspective; Figure 4 is a schematic structural diagram of the second in-vivo foreign body removal device provided by an embodiment of the present application from one perspective; Figure 5 is a schematic structural diagram of the second in-vivo foreign body removal device provided by an embodiment of the present application from another perspective; Figure 6 is a schematic structural diagram of the second in-vivo foreign body removal device provided by an embodiment of the present application from yet another perspective; Figure 7 is a schematic diagram of the in-vivo foreign body removal device provided by an embodiment of the present application in a contracted state and located within the lumen; Figure 8 is Figure 7 an enlarged view of part a; Figure 9 is a schematic diagram of the in-vivo foreign body removal device provided by an embodiment of the present application in a released state and during the process of capturing a foreign body; Figure 10 is Figure 9 an enlarged view of part b; Figure 11 is a schematic diagram of the in-vivo foreign body removal device provided by an embodiment of the present application after a foreign body enters the capture channel; Figure 12 is Figure 11 an enlarged view of part c; Figure 13 It is a schematic diagram of the state of the in-vivo foreign body removal device provided by the embodiment of the present application during contraction and foreign body removal; Figure 14 is Figure 13 an enlarged view of part d of; The reference numerals are as follows: 10 - fixed cylinder; 20 - capture net pocket; 21 - connecting arm; 22 - special-shaped part; 221 - adjustment part; 2211 - first part; 22111 - first end; 22112 - second end; 2212 - second part; 22121 - third end; 22122 - fourth end; 23 - first capture hole; 24 - second capture hole; 25 - adjustment space; 26 - third capture hole; 30 - support member; 31 - capture channel; 40 - conveying assembly; 41 - conveying pipe; 100 - lumen; 200 - foreign body. Detailed implementation manners

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe the acquisition modules, these acquisition modules should not be limited to these terms. These terms are only used to distinguish the acquisition modules from each other.

[0020] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0021] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of the present invention are described from the perspectives shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should be understood that when an element is referred to as being formed "on" or "under" another element, it can be formed not only directly "on" or "under" the other element, but also indirectly "on" or "under" the other element through an intermediate element.

[0022] In medical treatment, foreign bodies such as urinary stones, bile duct or gallbladder stones, and blood clots may pose a threat to human health. When these foreign bodies are large or difficult to pass naturally, minimally invasive interventional surgery is usually required to remove them.

[0023] Currently, commonly used foreign body retrieval devices consist of a wire basket. The basket's traction wire is connected to a retaining ring. During use, the basket is introduced into the target area via a delivery sheath. Upon release, the basket captures the foreign body and is retrieved through the sheath. To increase the basket's rigidity and expandability, existing designs typically utilize smaller mesh sizes to improve its ability to capture small foreign bodies.

[0024] However, due to the small mesh size, existing foreign body baskets have significant problems in capturing larger foreign objects. Not only is it difficult for larger foreign objects to enter the basket, but even if a foreign object enters, the larger number of traction wires can easily cause the foreign object to escape from the basket.

[0025] Therefore, how to improve the ability of the foreign body basket to capture and fix large-sized foreign objects remains an important challenge facing the existing technology.

[0026] In view of this, the present embodiment provides a device for removing foreign bodies from the body, which aims to form a capture channel that facilitates the entry of larger foreign bodies by utilizing two connected support members, use a capture net bag to catch the foreign bodies, and retract the support members to reduce the size of the capture channel when removing larger foreign bodies, thereby reducing the risk of foreign bodies detaching.

[0027] The following is combined with Figure 1-14 The foreign body removal device of this embodiment is introduced.

[0028] Combined with attachment Figure 1 and 2 As shown, the embodiment of the present application provides a device for removing foreign bodies from the body, which can be used with Figure 7-14 The delivery assembly 40 cooperates with the delivery tube 41 of the delivery assembly 40 to deliver the foreign body removal device into the lumen 100, and in some embodiments, the delivery tube 41 can also be used to release and retract the foreign body removal device.

[0029] In some embodiments, the delivery assembly 40 can be part of a device for removing foreign objects from the body. The delivery tube 41 can accommodate the device for removing foreign objects from the body, and the device for removing foreign objects from the body can be released or contracted by moving the device for removing foreign objects from the body axially along the delivery tube 41. The specific release and contraction processes are given below.

[0030] The device for removing foreign objects from the body in this embodiment includes a fixed cylinder 10, a capture net 20, and a plurality of support members 30. The capture net 20 and the support members 30 are made of metal braiding or laser etching. The fixed cylinder 10 can be installed on the above-mentioned delivery tube 41 and can move axially or in the length direction of the delivery tube 41.

[0031] A plurality of support members 30 are arranged at intervals along the circumferential direction of the fixed cylinder 10 and are connected to the distal end of the fixed cylinder 10. A capture channel 31 for foreign objects 200 to enter is defined between adjacent support members 30, and the circumferential spacing between adjacent support members 30 is adjustable.

[0032] The capture channel 31 for foreign objects 200 defined between adjacent support members 30 is more convenient for larger foreign objects 200 to enter compared with the grid-like structure in the related art. In addition, in this embodiment, the spacing between adjacent support members 30 is designed to be adjustable. Specifically, the spacing between the two support members 30 can be adjusted by adjusting the contraction and release of the device for removing foreign objects from the body.

[0033] The device for removing foreign objects from the body can be switched between a contracted state and a released state, and there are various means for specific contraction and release.

[0034] For example, during contraction, at least part of the support member 30 is constrained by the side wall of the delivery tube 41, such as the proximal end (the end close to the medical operator) of the support member 30, so as to reduce the spacing between adjacent support members 30. During expansion, the constraint of the delivery tube 41 on the support member 30 is released, and the support member 30 expands under its own elastic force, so as to increase the spacing between adjacent support members 30.

[0035] For another example, the support member 30 in this embodiment can be designed to be made of shape memory metal wire. When it reaches the lumen 100, the device for removing foreign objects from the body releases itself as the temperature rises, so as to increase the spacing between adjacent support members 30. When contraction is required, the delivery tube 41 can be used to constrain the plurality of support members 30 to shorten the spacing between adjacent support members 30.

[0036] The capture net 20 in this embodiment is connected to the distal ends of a plurality of support members 30 and is used to hold the foreign objects 200 that enter through the capture channel 31. The preferred structural form of the capture net 20 is given below.

[0037] Combined with the above structural description, in this embodiment, two adjacent support members 30 enclose a capture channel 31 for foreign objects 200 to enter, facilitating the entry of larger foreign objects 200. Then, the capture net 20 catches the foreign objects 200 entering through the capture channel 31, and as the foreign objects 200 in the entire lumen 100 move outward, the larger foreign objects 200 can be removed. In addition, the circumferential distance between the two support members 30 can be adjusted to reduce the distance between the two support members 30, thereby reducing the risk of the foreign objects 200 detaching from the capture channel 31. This not only enables the rapid capture of larger foreign objects 200 but also reduces the possibility of the foreign objects 200 detaching from the in-vivo foreign object removal device during the capture and removal process of the foreign objects 200. Moreover, compared with a more complex grid structure, the method of enclosing the capture channel 31 by two support members 30 is simpler in structure and also facilitates the contraction operation of medical staff.

[0038] Again referring to the attached Figure 1 and 2 shown, in some examples, optionally, the capture net 20 includes connecting arms 21 and a special-shaped member 22. A plurality of connecting arms 21 are provided at the distal ends of each support member 30. The connecting arms 21 can be integrally formed or integrally connected with the support member 30. In some embodiments, the connecting arms 21 can be regarded as part of the support member 30 or part of the capture net 20.

[0039] The plurality of connecting arms 21 of the plurality of support members 30 are respectively connected to the special-shaped member 22. Two adjacent connecting arms 21 and the special-shaped member 22 enclose a first capture hole 23. Specifically, it can be Figure 1 as shown in

[0040] where the two adjacent connecting arms 21 on the same support member 30 and the special-shaped member 22 enclose the first capture hole 23. Figure 1 Taking the example that each support member 30 in

[0041] has two connecting arms 21, the two connecting arms 21 and the support member 30 form a structure similar to a Y shape. After the distal ends of the two connecting arms 21 are respectively butted against the special-shaped member 22, a closed-shaped first capture hole 23 is enclosed, or a first capture sleeve with the first capture hole 23 is enclosed.

[0042] The special-shaped member 22 can be regarded as a second capture sleeve structure. The special-shaped member 22 is provided with a second capture hole 24 with an adjustable size. By utilizing the characteristic that the space of the second capture hole 24 is smaller than the size of a general foreign object 200, the capture net pocket 20 can hold the foreign object 200 at the bottom.

[0043] Furthermore, in this embodiment, the special-shaped member 22 is further configured to: when adjusting the circumferential distance between two adjacent connecting arms 21 located on the same support member 30, the size of the second capture hole 24 can be adjusted.

[0044] Under this structure, the special-shaped member 22 does not need to be configured with a separate structure for adjusting the size. By adjusting the distance between the connecting arms 21, the size of the second capture hole 24 is adaptively changed. Thus, when the second capture hole 24 is used to hold a smaller foreign object 200, it can be reduced to a certain range, reducing the risk of the smaller foreign object 200 escaping from the capture net pocket 20, and further improving the reliability of capturing the foreign object 200.

[0045] The distance between two adjacent connecting arms 21 on the same support member 30 can be adjusted by the restraint of the inner wall of the above-mentioned delivery tube 41. For example, in the released state of the in-vivo foreign object removal device, the distance between two adjacent connecting arms 21 is larger. After the support member 30 is restrained by the inner wall of the delivery tube 41, the distance between two adjacent support members 30 becomes smaller, and at the same time, the distance between two connecting arms 21 located on the same support member 30 becomes smaller. At this time, two adjacent connecting arms 21 simultaneously drive a part of the special-shaped member 22 to contract inward, thereby adjusting the size of the second capture hole 24. The special-shaped member 22, the connecting arms 21, and the support member 30 in this state can have a certain elastic restoring force. After the restraint of the inner wall of the delivery tube 41 is released, the in-vivo foreign object removal device can be released again, and this adjustment method can simultaneously adjust the distance between all adjacent support members 30 and the distance between adjacent connecting arms 21, so that the size of the second capture hole 24 can be scaled along its own center without causing the entire in-vivo foreign object removal device to shift in the lumen 100.

[0046] In some examples, optionally, the special-shaped member 22 includes a plurality of adjusting portions 221 that are sequentially connected end to end in the circumferential direction and enclose the second capture hole 24. The plurality of adjusting portions 221 enclose a special-shaped structure that is generally similar to a ring sleeve.

[0047] Two adjacent adjusting portions 221 can be integrally connected or integrally formed. The special-shaped member 22 can also be integrally connected or integrally formed with the support member 30.

[0048] The plurality of connecting arms 21 of the plurality of support members 30 are connected to the plurality of adjusting portions 221 in one-to-one correspondence, so as to Figure 1 and 2Taking the three support members 30 in [[]] as an example, with two connecting arms 21 provided on each support member 30, the number of the adjusting portions 221 is six at this time, and the six adjusting portions 221 are connected to six connecting members in one-to-one correspondence.

[0049] The adjusting portion 221 is provided with an adjusting space 25 communicating with the second capture hole 24. The special-shaped member 22 is configured to adjust the interval between two adjacent connecting arms 21 on the same support member 30 to adjust the size of the adjusting space 25, so as to adjust the size of the second capture hole 24.

[0050] The adjusting space 25 of the adjusting portion 221 is the largest in the released state of the in-vivo foreign object removal device. When multiple adjusting portions 221 approach circumferentially under the drive of their respective connecting arms 21, the adjusting space 25 shrinks, and at the same time drives the second capture hole 24 to contract. In this way, the adjustment of the first capture hole 23 is realized, and the synchronous adjustment of the second capture hole 24 is also realized. The structure is ingenious and there is no need to separately configure an adjustment structure for the second capture hole 24.

[0051] It should be noted that Figure 1 the number of the support members 30 in [[]] is three, two connecting arms 21 are provided on each support member 30, the number of the adjusting portions 221 is six, and the six connecting arms 21 are connected to the six adjusting portions 221 in one-to-one correspondence. Of course, the number and layout manner of the connecting arms 21 and the connecting arms 21 in this embodiment may not be limited to this.

[0052] In some examples, optionally, the adjusting portion 221 includes a first portion 2211 and a second portion 2212. The first portion 2211 includes an opposite first end 22111 and a second end 22112, and the second portion 2212 includes an opposite third end 22121 and a fourth end 22122. The first end 22111 and the third end 22121 are connected and are respectively connected to the same connecting arm 21. The first end 22111, the third end 22121, and the connecting arm 21 may be an integrally formed structure.

[0053] The second end 22112 and the fourth end 22122 are arranged at intervals. The second end 22112 is used to connect the fourth end 22122 of the second portion 2212 of the adjacent adjusting portion 221, and the fourth end 22122 is used to connect the second end 22112 of the first portion 2211 of the adjacent adjusting portion 221.

[0054] This structure encloses the above-mentioned adjustment space 25 through the first part 2211 and the second part 2212. At this time, the adjustment part 221 is approximately V-shaped or gate-shaped, and the adjustment space 25 is the space inside the V-shaped or gate-shaped structure. The adjustment space 25 communicates with the second capture hole 24 through the interval between the second end 22112 and the fourth end 22122 (the opening of the V-shaped or gate-shaped structure). When the second end 22112 and the fourth end 22122 approach each other, the adjustment space 25 decreases, and at the same time, it can drive the second capture hole 24 to decrease, realizing the synchronous adjustment of the sizes of the first capture hole 23, the adjustment space 25, and the second capture hole 24.

[0055] In order to make the distance adjustment stroke between the second end 22112 and the fourth end 22122 controllable, so that greater elastic potential energy is generated when the second end 22112 and the fourth end 22122 approach to a certain position, and then it is convenient to expand the adjustment space 25 again. In this embodiment, the structure of the adjustment part 221 is further improved.

[0056] As Figure 1 and 2 shown, in some examples, in this embodiment, the first end 22111 is designed as the first arc end, the third end 22121 is designed as the second arc end, the first arc end and the second arc end are integrally connected to enclose the third arc end, and the parts of the first part 2211 except the first arc end and the parts of the second part 2212 except the second arc end are arranged at an angle.

[0057] This structure makes the adjustment part 221 form an arc structure at the position away from the second capture hole 24. The arc structure has better elastic deformation and recovery ability compared with the V-shaped angle structure when being compressed, which is beneficial to the rapid expansion of the adjustment space 25 when the device is released from the contracted state, and then it is convenient to drive the above-mentioned first capture hole 23 and the second capture hole 24 to expand rapidly.

[0058] Combined with the attached Figure 1 shown again, in some examples, optionally, in the direction from the proximal end to the distal end of the support member 30, the circumferential spacing between adjacent two connecting arms 21 of each support member 30 gradually increases, and the distal end of the connecting arm 21 is a curved shape concave in the direction away from the second capture hole 24.

[0059] This structure makes the adjacent two connecting arms 21 and the special-shaped member 22 enclose a structure approximately in the shape of a water droplet. From the proximal end to the distal end of the connecting arm 21, the distance between the two connecting arms 21 gradually increases, so that the first capture hole 23 can better limit the foreign object 200 at the proximal end, reducing the possibility of the foreign object 200 escaping from the device.

[0060] The distal end of the connecting arm 21 is a curved shape that is recessed in a direction away from the second capture hole 24, so that the distal end of the connecting arm 21 has better deformation recovery force, facilitating the rapid expansion of the distance between two adjacent connecting arms 21 located on the same support member 30 when the device is released from the contracted state.

[0061] Combined with the attached Figure 4-6 As shown, in order to further reduce the possibility of a relatively large foreign object 200 detaching from the capture channel 31, in some examples, optionally, along the circumferential direction of the capture net 20, the connecting arms 21 on each support member 30 are connected to the connecting arms 21 on another adjacent support member 30, and together with the special-shaped member 22, a third capture hole 26 is defined.

[0062] Specifically, the middle part of the connecting arm 21 on one of the support members 30 approaches another support member 30. Similarly, the connecting arm 21 of another support member 30 adjacent to this support member 30 also approaches this support member 30, so that the middle parts of two adjacent connecting arms 21 on the two support members 30 are connected at a certain point. The connecting arms 21 connected by these two middle parts and the special-shaped member 22 together define the above-mentioned third capture hole 26.

[0063] This structure makes the distal end of the foreign object 200 extraction device in the lumen 100 form a more complex grid-like structure, thereby enabling better capture of the foreign object 200, reducing the possibility of the foreign object 200 detaching from the device during the extraction process, and the size of the third capture hole 26 can be adjusted by contracting the foreign object 200 extraction device in the lumen 100, facilitating the entry of the foreign object 200.

[0064] Combined with the attached Figure 1 As shown, in some examples, optionally, the support member 30 is curved. In the direction from the proximal end to the distal end of the support member 30, the radial distance between each support member 30 and the axis of the fixed cylinder 10 first gradually increases and then gradually decreases.

[0065] For ease of understanding, in this embodiment Figure 1 the axis of the fixed cylinder 10 is shown as a dotted line, and in this embodiment, the radial distance between the support member 30 and the axis of the fixed cylinder 10 is labeled as L.

[0066] Combined with the attached Figure 1 [[ID=

[0067] In some examples, optionally, the support member 30 and the capture net bag 20 are respectively made of elastic materials. The elastic material can be a metal material, specifically, a memory metal, etc., which will not be listed in detail in this embodiment.

[0068] The following is combined with Figure 7-14 The working state of the foreign body removal device provided in the embodiment of the present application is introduced as follows: Combined with attachment Figure 7 and 8 As shown, at this time, the foreign body removal device is in a contracted state and is delivered into the lumen 100 through the delivery tube 41 .

[0069] Then, the foreign body removal device is released, so that the size of the capture channel 31, the first capture hole 23 and the second capture hole 24 are expanded to Figure 9 and 10 In the state of the body foreign body removal device, the foreign body removal device can be realized by the memory deformation of the support member 30 and the capture net bag 20 itself, or by using the delivery tube 41 or other auxiliary structures.

[0070] Then the capture channel 31 is brought close to the foreign matter 200 so that the foreign matter 200 enters the capture channel 31 to form a Figure 11 and Figure 12 Status in.

[0071] Finally, Figure 13 and 14 As shown, the foreign body removal device is driven to move along the length direction of the delivery tube 41, and the foreign body removal device is contracted, so that the foreign body removal device can drive the foreign body 200 out of the lumen 100. The contraction of the foreign body removal device can be achieved by squeezing the delivery tube 41 or other auxiliary structures.

[0072] The entire process can be assisted by visualization equipment, for example, the support member 30 and / or the capture net bag 20 can be designed with a developing ring (not shown in the figure), so that medical staff can easily know the specific status and position of the foreign body removal device.

[0073] The above description is merely a preferred embodiment of the present invention. Those skilled in the art should understand that the scope of the present invention is not limited to technical solutions formed by specific combinations of the above-mentioned technical features. It also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents, without departing from the above-mentioned disclosure. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. An in-vivo foreign object removal device, characterized in that, Comprising: Fixed cylinder; A plurality of support members, which are arranged at intervals along the circumferential direction of the fixed cylinder and are connected to the distal end of the fixed cylinder. A capture channel for foreign objects to enter is defined between two adjacent support members, and the circumferential spacing between two adjacent support members is adjustable; and A capture net bag, which is connected to the distal ends of the plurality of support members and is used to hold the foreign objects entering through the capture channel.

2. The in-vivo foreign object removal device according to claim 1, characterized in that, The capture net bag includes connecting arms and a special-shaped member. A plurality of the connecting arms are provided at the distal ends of each of the support members. The plurality of connecting arms of the plurality of support members are respectively connected to the special-shaped member. A first capture hole is defined between two adjacent connecting arms on the same support member and the special-shaped member. The special-shaped member is provided with a second capture hole with an adjustable size. The special-shaped member is configured to adjust the size of the second capture hole by adjusting the spacing between two adjacent connecting arms on the same support member.

3. The in-vivo foreign body removal device according to claim 2, characterized in that, The special-shaped member includes a plurality of adjusting portions that are sequentially connected end to end along the circumferential direction to define the second capture hole. The plurality of connecting arms of the plurality of support members are connected to the plurality of adjusting portions in one-to-one correspondence. The adjusting portion is provided with an adjusting space communicating with the second capture hole. The special-shaped member is configured to adjust the size of the adjusting space by adjusting the spacing between two adjacent connecting arms on the same support member, so as to adjust the size of the second capture hole.

4. The in-vivo foreign body removal device according to claim 3, characterized in that, The adjusting portion includes a first part and a second part. The first part includes opposite first and second ends. The second part includes opposite third and fourth ends. The first end and the third end are connected and are respectively connected to the same connecting arm. The second end and the fourth end are arranged at intervals, so that the first part and the second part define the adjusting space. The second end is used to connect the fourth end of the second part of the adjacent adjusting portion. The fourth end is used to connect the second end of the first part of the adjacent adjusting portion.

5. The in-vivo foreign body removal device according to claim 4, characterized in that, The first end is a first arc end, the third end is a second arc end, the first arc end and the second arc end are integrally connected to define a third arc end. The part of the first part except the first arc end and the part of the second part except the second arc end are arranged at an angle.

6. The in-vivo foreign body removal device according to claim 2, characterized in that, In the direction from the proximal end to the distal end of the support member, the circumferential spacing between two adjacent connecting arms of each support member gradually increases, and the distal end of the connecting arm is a curved shape that is recessed in the direction away from the second capture hole.

7. The in-vivo foreign object removal device according to claim 2, characterized in that, Along the circumferential direction of the capture net bag, the connecting arms on each support member are connected to the connecting arms on another adjacent support member and define a third capture hole with the special-shaped member.

8. A device for removing foreign objects in the body according to any one of claims 1-6, characterized in that, In the direction from the proximal end to the distal end of the support member, the radial distance between each support member and the axis of the fixed cylinder first gradually increases and then gradually decreases.

9. A device for removing foreign bodies in vivo according to any one of claims 1-6, characterized in that, The support member and the capture net bag are respectively made of elastic materials.

10. A device for removing foreign objects in the body according to any one of claims 1-6, characterized in that, The support member and the capture net bag are an integral part.

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