Tissue cutting assembly and fetching device

Abstract

A tissue cutting assembly and a fetching device relate to the field of medical devices, and comprise a sleeve, a first force transmission member and a plurality of cutting wires. The front ends of the multiple cutting wires are gathered, and the rear ends of the multiple cutting wires are all connected to the first force transmission piece. The first force transmission piece is slidably installed on the sleeve and used for driving the multiple cutting wires to stretch out of the front end of the sleeve or retract into the sleeve. And when the plurality of cutting wires extend out of the sleeve, the plurality of cutting wires are matched to define at least one cutting space. According to the structural design of the tissue cutting assembly, the tissue cutting assembly can be matched with an object taking bag, a target object can be cut up in the body, the size of the target object is reduced, the target object can be taken out through a natural channel of the human body, non-invasive surgery can be achieved, operation is convenient, and the infection risk is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical equipment, and particularly relates to a tissue cutting assembly and a taking equipment. BACKGROUND

[0002] In the clinical treatment process, in order to obtain in-vivo tissue samples or resected tissues, etc., generally, cutting equipment is used to cut the target object to separate it from the human body, such as commonly known snares and other instruments. The resected target object is taken out of the body with the aid of a net basket or a taking bag and other instruments. Due to the volume of the cut target object, invasive surgery is generally required to take out the target object, that is, the volume of the target object is too large to be taken out directly from the natural passageway of the human body (such as the urethra), and therefore, the surgical operation is inconvenient, and the risk of infection of the surgical incision is high. SUMMARY

[0003] The utility model aims to provide a tissue cutting assembly and a taking equipment, which can shred the target object in the body, reduce the volume of the target object, enable the target object to be taken out through the natural passageway of the human body, achieve non-invasive surgery, and be convenient to operate and have a low risk of infection.

[0004] The embodiments of the utility model can be implemented as follows:

[0005] In a first aspect, the utility model provides a tissue cutting assembly, comprising:

[0006] A sleeve, a first force transmission member, and a plurality of cutting wires, the front ends of the plurality of cutting wires converge, the rear ends of the plurality of cutting wires are connected to the first force transmission member, the first force transmission member is slidably installed in the sleeve, and the first force transmission member is used to drive the plurality of cutting wires to extend out of the front end of the sleeve or retract into the sleeve; and when the plurality of cutting wires extend out of the sleeve, the plurality of cutting wires cooperate to define at least one cutting space.

[0007] In an optional embodiment, each of the cutting wires has at least one bending section in the extension direction thereof.

[0008] Based on the above scheme, the bending cutting wire can form a larger cutting space in a limited space, which facilitates the target object to enter the cutting space and improves the cutting success rate. Moreover, the bending section is arranged to enable the cutting wire to be better combined with the pocket body, thereby improving the stability of the cutting wire.

[0009] In a second aspect, the utility model provides a taking equipment, comprising:

[0010] The pouch is slidably received in the sleeve, and forms a sampling cavity for receiving tissue when the pouch extends out of the front end of the sleeve; and a portion of the cutting wire is located in the sampling cavity for cutting tissue in the sampling cavity.

[0011] In an optional embodiment, the pouch comprises a pouch body and a second force transmission member, the second force transmission member is connected with the pouch body, and the pouch body and the second force transmission member are slidably installed in the sleeve.

[0012] The sampling cavity is formed when the pouch body extends out of the front end of the sleeve; and the second force transmission member is used to close the entrance of the sampling cavity when the pouch body extends out of the sleeve.

[0013] Based on the above scheme, when the pouch body receives the target object, the second force transmission member is used to pull the pouch body towards the sleeve, so that the entrance of the pouch body is closed, and the target object is in a relatively closed space. When the cutting wire is used to cut the target object in the pouch body, it is not easy to slip, and the cutting efficiency is high. At the same time, the fragmented tissue obtained after cutting is not easy to leak from the entrance and is not easy to remain in the body, thereby improving safety.

[0014] In an optional embodiment, the second force transmission member is connected with the edge of the pouch body surrounding the entrance.

[0015] Based on the above scheme, the second force transmission member directly drives the edge of the entrance to move, and the closing effect of the entrance is good.

[0016] In an optional embodiment, the bottom of the pouch body is provided with a foldable bin in communication with the sampling cavity.

[0017] Based on the above scheme, in the initial state, the foldable bin is in a completely folded state, and the volume is small, which is beneficial for storage. After the target object is cut, the target object can be taken out from the natural channel or instrument channel of the human body. At this time, the pouch body and the fragmented tissue in it enter the natural channel or instrument channel of the human body together. The fragmented tissue gradually enters the foldable bin under the extrusion of the channel wall. The foldable bin is self-adaptively lengthened. The design of the foldable bin realizes the rearrangement of the fragmented tissue in the pouch body, thereby facilitating the taking out of the fragmented tissue from the body.

[0018] In an optional embodiment, the cross-sectional area of the foldable bin gradually decreases in the direction from the bin opening to the bin bottom of the foldable bin, and the bin opening is in communication with the bottom of the sampling cavity.

[0019] Based on the above scheme, the thickness of the foldable bin in the folded state is small, and the structure is compact.

[0020] In an optional embodiment, the retrieval device further includes a limiting member that is slidably engaged with the sleeve, and the limiting member has a switchable first position and a second position. When in the first position, a channel for receiving the pocket body is formed between the limiting member and the front end of the sleeve; when in the second position, the degree of freedom of the limiting member in the direction from the front end of the sleeve to the rear end of the sleeve is constrained, so as to restrict the pocket body from retracting into the sleeve by the limiting member.

[0021] Based on the above scheme, when force is applied to the second force transmission component to drive the pocket body to move and close the inlet of the pocket body, the pocket body is pulled towards the sleeve, and the pocket body contacts the limiting component in the second position inside the sleeve. The limiting component prevents the pocket body from continuing to move into the sleeve, and the target object inside the pocket body will not enter the sleeve. It is not easy for the target object to separate from the cutting wire or for the target object to have a small volume in the cutting space due to entering the sleeve. The cutting wire can effectively cut the target object, which is conducive to the subsequent removal of fragmented tissue.

[0022] In an optional embodiment, a first stop portion is provided on the inner wall surface of the sleeve, and a second stop portion is provided on the limiting member. The first stop portion and the second stop portion are used to engage when the limiting member moves from the first position to the second position.

[0023] Based on the above scheme, when the limiting member switches from the first position to the second position, the first stop part and the second stop part automatically engage, which facilitates the control of the position of the limiting member relative to the sleeve.

[0024] In an optional embodiment, one of the first stop portion and the second stop portion is configured as a protrusion, and the other is configured as a groove that can engage with the protrusion.

[0025] Based on the above scheme, the protrusions and grooves have simple structures and fit together firmly and reliably.

[0026] In an optional embodiment, the cutting wire is pre-fixed to the inner wall surface of the pocket body.

[0027] Based on the above scheme, the cutting wire and the bag body are pre-fixed together, making the shape of the cutting wire more stable, which facilitates the target object to enter the cutting space enclosed by the cutting wire and improves the cutting quality.

[0028] The beneficial effects of this utility model embodiment include, for example:

[0029] In summary, the tissue cutting component provided in this embodiment can be used in conjunction with a retrieval pouch. The target object to be cut falls into the retrieval pouch, and the tissue cutting component shreds the target object within the pouch. This means the target object is cut inside the body, yielding multiple small tissue fragments. This reduces the requirements for the size of the surgical channel and makes it suitable for natural human passages such as the urethra. It is applicable to both invasive and non-invasive surgeries, exhibiting good versatility and adaptability. Because the cutting is completed inside the body, tissue exposure is avoided, improving surgical efficiency and reducing the risk of infection. Furthermore, since one end of multiple cutting wires converges and the other end is connected to a first force transmission component, pulling the first force transmission component can drive the multiple cutting wires to move together, making operation convenient and flexible. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the tissue cutting component according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the object retrieval device according to an embodiment of this application;

[0033] Figure 3 This is a partial cross-sectional schematic diagram of the object retrieval device according to an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the limiting member according to an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the retrieval bag according to an embodiment of this application.

[0036] icon:

[0037] 100 - Tissue cutting assembly; 110 - Sleeve; 111 - First channel; 112 - Second channel; 113 - Annular stop surface; 114 - First stop part; 120 - First force transmission component; 130 - Cutting wire; 131 - Bending section; 132 - Cutting space; 200 - Retrieval pocket; 210 - Pocket body; 220 - Second force transmission component; 230 - Sampling chamber; 240 - Foldable compartment; 300 - Limiting component; 310 - Second stop part; 320 - First through hole; 330 - Second through hole; 400 - Handle assembly. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0044] In existing technologies, the target volume of the resected object is large, and it is generally only suitable for invasive surgery. As a result, the surgical efficiency is low and the risk of surgical wound infection is high.

[0045] In view of this, the designers have provided a tissue cutting component 100 that can be used in conjunction with a retrieval pouch 200 to cut the target object inside the retrieval pouch 200 into smaller pieces of tissue, reducing the requirements for the size of the channel, making it suitable for non-invasive surgery, with high surgical efficiency and low risk of infection.

[0046] Please refer to Figure 1This embodiment provides a tissue cutting assembly 100, including a sleeve 110, a first force transmission member 120, and multiple cutting wires 130. The front ends of the multiple cutting wires 130 converge, and the rear ends of the multiple cutting wires 130 are all connected to the first force transmission member 120. The first force transmission member 120 is slidably mounted on the sleeve 110 and is used to drive the multiple cutting wires 130 to extend out of the front end of the sleeve 110 or retract into the sleeve 110; and when the multiple cutting wires 130 extend out of the sleeve 110, the multiple cutting wires 130 cooperate to define at least one cutting space 132.

[0047] As described above, the working principle of the tissue cutting component 100 provided in this embodiment is as follows:

[0048] The tissue cutting component 100 can be used in conjunction with the retrieval bag 200. When the cut target falls into the retrieval bag 200, part of the target enters the cutting space 132 formed by the cutting wires 130. Force is applied to the first force transmission component 120, which drives all the cutting wires 130 to move. The cutting wires 130 are used to cut the target into multiple smaller pieces of tissue. The tissue fragments have good passability and low requirements for channel size. They can be taken out from the body's natural passages, making them suitable for non-invasive surgery, improving surgical efficiency and reducing the risk of infection.

[0049] It should be noted that the number of cutting wires 130 is designed as needed. For example, in this embodiment, there are three cutting wires 130. The three cutting wires 130 constitute three cutting spaces 132, which can cut the target object located in the retrieval pocket 200 into three pieces of tissue.

[0050] Optionally, each cutting wire 130 has at least one bent section 131 in its extending direction. By bending the cutting wire 130, a larger cutting space 132 can be formed within a limited space, which facilitates the entry of the target object into the cutting space 132 and improves the cutting success rate. Furthermore, by setting the bent section 131, the cutting wire 130 can better integrate with the cover body 210, thereby improving the stability of the cutting wire 130.

[0051] Optionally, the first force transmission component 120 can be a cable or rope, etc.

[0052] The tissue cutting assembly 100 provided in this embodiment uses multiple cutting wires 130 to form at least one cutting space 132, which can cut a target object located in the retrieval pocket 200 into at least two tissue fragments. Each tissue fragment is small in volume, has low requirements for channel size, and can be removed from the body's natural passages, achieving non-invasive surgery. Furthermore, one end of each cutting wire 130 converges, and the other end cooperates with the first force transmission member 120. By applying force to the first force transmission member 120, all cutting wires 130 can be moved, making operation convenient. The multiple cutting wires 130 form a mesh structure, providing high stability.

[0053] Please combine Figures 2-5 This embodiment also provides a retrieval device, including a retrieval pouch 200 and the tissue cutting assembly 100 described in the above embodiment. The retrieval pouch 200 is slidably housed within a sleeve 110, and when the retrieval pouch 200 extends beyond the front end of the sleeve 110, it forms a sampling cavity 230 for receiving tissue. A portion of the cutting wire 130 is located within the sampling cavity 230 and is used to cut the tissue within the sampling cavity 230.

[0054] With this design, when the retrieval pouch 200 receives the cut-off target object, the target object falls into the sampling chamber 230 and comes into contact with the cutting wire 130. Part of the target object is located in the cutting space 132. When force is applied to the first force transmission member 120, causing it to drive the multiple cutting wires 130 to move, the cutting space 132 gradually decreases, thereby cutting off the target object and forming multiple small pieces of tissue. The tissue fragments have good permeability and can be directly removed from the body's natural passages, achieving non-invasive surgery.

[0055] Please combine Figures 2-3 In this embodiment, optionally, the sleeve 110 can be configured as a flexible tube, which can adapt to the shape of the human body channel, thereby delivering the retrieval pouch 200 and the tissue cutting component 100 to a predetermined position inside the body. Simultaneously, the lumen of the sleeve 110 includes a first channel 111 and a second channel 112 that are connected. Both the first channel 111 and the second channel 112 are circular channels. The end of the first channel 111 away from the second channel 112 is the front end. Corresponding to the front end of the sleeve 110, the diameter of the first channel 111 is larger than the diameter of the second channel 112. A first stop portion 114 is provided on the inner wall surface of the first channel 111. The first stop portion 114 can be an annular groove. Since the diameter of the first channel 111 is larger than the diameter of the second channel 112, an annular stop surface 113 is formed at the connection between the first channel 111 and the second channel 112.

[0056] Optionally, a limiting member 300 is installed in the first channel 111. The limiting member 300 can be a cylindrical structure and is slidably installed in the first channel 111. A second stop portion 310 is provided on the outer peripheral surface of the limiting member 300. The second stop portion 310 can be an annular protrusion. The limiting member 300 can slide in the first channel 111 along the extending direction of the first channel 111, so that it has a switchable first position and a second position. When the limiting member 300 is in the first position, the rear end of the limiting member 300 contacts the annular stop surface 113. At this time, there is a gap between the limiting member 300 and the front end of the first channel 111. The limiting member 300 will not obstruct the retrieval pocket 200 from entering the sleeve 110. That is, when the limiting member 300 is in the first position, the retrieval pocket 200 can also be stored in the first channel 111 of the sleeve 110. When the limiting member 300 is in the second position, the second stop portion 310 of the limiting member 300 engages with the first stop portion 114 on the sleeve 110, and the degree of freedom of the limiting member 300 in the direction from the front end of the sleeve 110 to the rear end of the sleeve 110 is constrained. At this time, the limiting member 300 cannot slide backward relative to the sleeve 110.

[0057] It should be understood that when the first stop portion 114 is a protrusion, the second stop portion 310 can also be configured as a groove that mates with the protrusion.

[0058] Please combine Figure 4 Meanwhile, the limiting member 300 is provided with two first through holes 320 and one second through hole 330. The second through hole 330 is coaxial with the limiting member 300, and the two first through holes 320 are distributed on both sides of the second through hole 330. The first force transmission member 120 is slidably inserted into the second through hole 330.

[0059] Please combine Figure 5In this embodiment, optionally, the retrieval pouch 200 includes a pouch body 210 and a second force transmission member 220. The pouch body 210 is initially housed within the sleeve 110, and can slide out from the front end of the sleeve 110 to form a sampling chamber 230. One side of the sampling chamber 230 is configured as an inlet, allowing the target object to enter the sampling chamber 230. The second force transmission member 220 can be a pull rope or cable, and is slidably connected to the edge of the pouch body 210 forming the inlet. For example, a channel can be provided at the edge of the pouch body 210, and the second force transmission member 220 can slidably pass through the channel. Simultaneously, both ends of the second force transmission member 220 can respectively pass through two first through holes 320. Furthermore, the second force transmission member 220 can be pre-fixed with the limiting member 300; that is, in the initial state, the limiting member 300 is in the first position, and the pouch body 210 is located inside the sleeve 110. When the pocket body 210 needs to be pushed out, force is applied to the second force transmission member 220, causing it to push the pocket body 210 towards the front end of the sleeve 110. Since the second force transmission member 220 and the limiting member 300 are pre-fixed, the limiting member 300 can also move from the first position to the second position under the drive of the second force transmission member 220. When the limiting member 300 is in the second position, the pocket body 210 extends out of the sleeve 110 to form the sampling cavity 230, and the limiting member 300 is engaged with the sleeve 110. When force is continued to be applied to the second force transmission member 220 to pull the pocket body 210 back into the sleeve 110, the limiting member 300 is restricted by the sleeve 110 and cannot retract. At this time, the pre-fixation between the second force transmission member 220 and the limiting member 300 is broken, and the second force transmission member 220 can slide relative to the first through hole 320, thereby closing the opening of the pocket body 210. Since the pocket body 210 is in contact with the limiting member 300, it cannot enter the sleeve 110, and the target object inside the pocket body 210 will not enter the sleeve 110, thus not affecting the cutting wire 130's cutting of the target object.

[0060] Since the second force transmission component 220 is connected to the inlet position of the pocket body 210, pulling the second force transmission component 220 can cause it to move the pocket body 210 closer to the sleeve 110, thereby facilitating the closure of the inlet.

[0061] Optionally, a foldable compartment 240 is provided at the bottom of the pouch body 210 opposite to the inlet. The opening of the foldable compartment 240 is connected to the sampling chamber 230, and the bottom of the foldable compartment 240 is closed. In the initial state, the foldable compartment 240 is fully folded, small in size, and easy to store. After the target object is cut, in order to remove the target object, the retrieval instrument can be taken out from the body's natural passage or instrument passage. At this time, the pouch body 210 and the fragmented tissue inside it enter the body's natural passage or instrument passage together. Under the compression of the passage wall, the fragmented tissue gradually enters the foldable compartment 240. The foldable compartment 240 adapts to change length. The design of the foldable compartment 240 realizes the rearrangement of the fragmented tissue in the pouch body 210, thereby facilitating the removal of the fragmented tissue from the body.

[0062] Furthermore, the cross-sectional area of ​​the foldable compartment gradually decreases from the opening to the bottom of the foldable compartment, with the opening connecting to the bottom of the sampling chamber 230. The foldable compartment 240 is designed with a gradient structure, resulting in a small thickness, compact structure, and small space occupation when folded, making it easy to store in the sleeve 110 without increasing the length and diameter of the sleeve 110.

[0063] In this embodiment, it should be noted that the front end of the cutting wire 130 converges in the area enclosed by the compartment opening. Thus, multiple cutting wires 130 are located above the compartment opening, forming a grid structure, which can restrict the target object in the sampling chamber 230 from directly entering the folding compartment from the compartment opening, thereby improving the cutting effect of the cutting wire 130 on the target object.

[0064] Furthermore, each cutting wire 130 can be pre-fixed to the inner wall of the pocket body 210. The shape of the cutting wire 130 is more stable, making it easier for the target object to enter the cutting space 132 formed by the cutting wire 130, thereby improving the cutting quality. That is to say, in the initial state, the cutting wire 130 is connected to the pocket body 210. As the pocket body 210 extends out of the sleeve 110 to form the sampling cavity 230, the cutting wire 130 unfolds to form at least one cutting space 132. When the target object enters the sampling cavity 230 and comes into contact with the cutting wire 130, it is not easy for the cutting wire 130 to deform. The target object can smoothly enter the cutting space 132. When the first force transmission member 120 is pulled to drive the cutting wire 130 to move, the pre-fixation between the cutting wire 130 and the pocket body 210 is broken under the action of tension, and the cutting wire 130 can cut the target object.

[0065] It should be understood that the pre-fixation method between the cutting wire 130 and the pocket body 210 can be bonding, etc.

[0066] In other embodiments, optionally, the object retrieval device may also include a handle assembly 400, which may be installed on the sleeve 110. The handle assembly 400 may cooperate with the first force transmission member 120 and the second force transmission member 220 to control the first force transmission member 120 and the second force transmission member 220 respectively, making the operation flexible and convenient.

[0067] The tissue cutting component 100 provided in this embodiment, by configuring a cutting wire 130 inside the retrieval pouch 200, can cut the target object inside the retrieval pouch 200 using the cutting wire 130. The resulting multiple small tissue fragments are easy to remove, effectively improving the difficulty of handling large tissue volumes with traditional retrieval bags. Simultaneously, because the target object is cut into multiple small tissue fragments after being inside the body, the requirements for channel size are low, making it suitable for natural passages such as the urethra. It possesses good versatility and adaptability, enabling non-invasive surgery, improving efficiency, and reducing the risk of infection.

[0068] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A tissue cutting assembly comprising: The tissue cutting assembly comprises: a sleeve (110), a first force transmitting member (120), and a plurality of cutting wires (130), the front ends of the plurality of cutting wires (130) being gathered, the rear ends of the plurality of cutting wires (130) being connected to the first force transmitting member (120), the first force transmitting member (120) being slidably mounted in the sleeve (110), the first force transmitting member (120) being used to drive the plurality of cutting wires (130) to extend out of the front end of the sleeve (110) or to retract into the sleeve (110), and at least one cutting space (132) being defined by the plurality of cutting wires (130) when the plurality of cutting wires (130) extend out of the sleeve (110).

2. The tissue cutting assembly according to claim 1, wherein: each of the cutting wires (130) has at least one bending section (131) in the extension direction thereof.

3. A retrieval apparatus, characterized in that, The tissue sampling device comprises: a tissue sampling bag (200) and the tissue cutting assembly (100) according to claim 1 or 2, the tissue sampling bag (200) being slidably received in the sleeve (110), the tissue sampling bag (200) forming a sampling cavity (230) for receiving tissue when the tissue sampling bag (200) extends out of the front end of the sleeve (110), and the cutting wires (130) being partially located in the sampling cavity (230) for cutting tissue in the sampling cavity (230).

4. The tissue sampling device according to claim 3, wherein: the tissue sampling bag (200) comprises a bag body (210) and a second force transmitting member (220), the second force transmitting member (220) being connected to the bag body (210), and the bag body (210) and the second force transmitting member (220) being slidably mounted in the sleeve (110); the sampling cavity (230) is formed when the bag body (210) extends out of the front end of the sleeve (110), and the second force transmitting member (220) is used to close the entrance of the sampling cavity (230) when the bag body (210) extends out of the front end of the sleeve (110).

5. The tissue sampling device according to claim 4, wherein: the second force transmitting member (220) is connected to the edge of the bag body (210) surrounding the entrance.

6. The tissue sampling device according to claim 4, wherein: a foldable pocket (240) is provided at the bottom of the bag body (210) and is in communication with the sampling cavity (230).

7. The tissue sampling device according to claim 6, wherein: the cross-sectional area of the foldable pocket gradually decreases in the direction from the pocket opening to the pocket bottom of the foldable pocket, and the pocket opening is in communication with the bottom of the sampling cavity (230).

8. The tissue sampling device according to claim 4, wherein: The taking device further comprises a limiting member (300) slidably matched with the sleeve (110), and the limiting member (300) has a switched first position and a second position; when in the first position, the limiting member (300) and the front end of the sleeve (110) form a channel for accommodating the pocket body (210); when in the second position, the freedom of the limiting member (300) in the direction from the front end of the sleeve (110) to the rear end of the sleeve (110) is constrained to limit the pocket body (210) from retreating into the sleeve (110) through the limiting member (300).

9. The taking device according to claim 8, characterized in that: A first stop portion (114) is arranged on the inner wall surface of the sleeve (110), and a second stop portion (310) is arranged on the limiting member (300), and the first stop portion (114) and the second stop portion (310) are used for clamping matching when the limiting member (300) moves from the first position to the second position.

10. The taking device according to claim 4, characterized in that: The cutting wire (130) is pre-fixedly matched with the inner wall surface of the pocket body (210).

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