Internal cutting type fetching device for minimally invasive surgery

Abstract

The invention provides an internal cutting type fetching device for minimally invasive surgery, which relates to the field of medical equipment and comprises a sheathing canal and a fetching component. The object taking assembly comprises an object taking bag and an inner cutting mechanism. The object taking bag is provided with a containing cavity with an opening, and the inner cutting mechanism is installed in the object taking bag. The fetching assembly has an initial state and a working state which are switched, and when the fetching assembly is in the initial state, the fetching bag and the inner cutting mechanism are both located in the sheath tube; in a working state, the fetching bag and the inner cutting mechanism extend out of the sheath tube. The inner cutting mechanism is used for cutting the tissue located in the containing cavity when the fetching bag is in the state of stretching out of the sheathing canal. According to the structural design of the object taking device, the object taking device can be used for segmenting cut tissue in vivo, reducing the size of the tissue and conveniently taking out the tissue through a natural channel or an instrument channel, so that non-invasive object taking can be realized, surgical wounds are reduced, and the surgical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, in particular to an internal cutting type extractor for minimally invasive surgery. Background Art

[0002] The retrieval bag is a medical device mainly used to remove tissue resections during minimally invasive surgery to prevent contamination of other tissues and organs. It is suitable for minimally invasive surgeries such as laparoscopy. It can remove foreign bodies during surgery at one time, effectively preventing contact between diseased tissue and healthy tissue, reducing surgical difficulty, saving surgical time, improving surgical efficiency, and reducing the risk of postoperative infection.

[0003] The bag in the prior art has the following defects and deficiencies:

[0004] First, existing retrieval bags generally only have a single retrieval function, and due to their large size, they are generally only suitable for retrieval during invasive surgery.

[0005] Secondly, Chinese patent document CN202011063392.8, the patent name is: Multifunctional automatic peeling and aspirating tissue device for laparoscope. Disclosed is a multifunctional automatic peeling and aspirating tissue device for laparoscope, comprising a connecting box, the left side of the connecting box is connected to a collection tube, the inside of the collection tube is rotatably connected to a peeling head, the bottom of the connecting box is connected to a negative pressure tube, the surface of the connecting box is fixedly installed with a start switch, the top of the connecting box is fixedly installed with a forward and reverse switch, the left end of the collection tube is connected to a connecting tube, the connecting tube is threadedly connected to the collection tube, the left end of the connecting tube is connected to a specimen bag, and the specimen bag is bolted to the connecting tube; the present invention introduces the specimen bag into the incision, then uses the specimen bag to store tissue specimens under the laparoscope, uses the peeling head to automatically peel larger tissue specimens, and simultaneously uses the negative pressure tube to connect to the negative pressure generator to aspirate the specimen tissue into the storage bag, without expanding the surgical incision, thereby reducing the surgical infection rate.

[0006] In the aforementioned patent document, a retrieval bag is first used to store the surface tissue within a telescopic sleeve, and then the tissue is cut using a rotary cutting head within the telescopic sleeve. However, a problem exists: when the tissue enters the retrieval bag and needs to be cut into multiple pieces, the drawstring is pulled to close the opening of the retrieval bag. If the drawstring is pulled to close the opening, the retrieval bag and the tissue within it enter the sheath under the pullstring, this will affect the cutting of the tissue by the internal cutting mechanism, and there is a possibility that the tissue cannot be cut, thereby preventing the tissue in the retrieval bag from being cut into multiple small pieces, thereby affecting the subsequent process of removing the tissue from the body.

[0007] In summary, there is an urgent need for an endo-cutting device for minimally invasive surgery that can prevent pre-cut tissue from entering the sheath and can segment the resected tissue in vivo, reducing tissue volume and facilitating tissue removal through natural or instrumental channels. This device can achieve non-invasive retrieval, reduce surgical incisions, and improve surgical efficiency. However, no such device has been reported for minimally invasive surgery. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides an internal cutting device for minimally invasive surgery that prevents tissue before cutting from entering the sheath, can divide the resected tissue in the body, reduce the tissue volume, and facilitate the removal of the tissue through natural channels or instrument channels, thereby achieving non-invasive extraction, reducing surgical wounds, and improving surgical efficiency.

[0009] The embodiments of the present invention can be implemented as follows:

[0010] In a first aspect, the present invention provides an internal cutting type retrieval device, comprising a sheath tube and a retrieval assembly, wherein:

[0011] The retrieval assembly includes a retrieval bag and an internal cutting mechanism, wherein the retrieval bag is provided with a receiving cavity having an opening, and the internal cutting mechanism is installed in the retrieval bag; the retrieval assembly has a switchable initial state and a working state, wherein in the initial state, the retrieval bag and the internal cutting mechanism are both located in the sheath tube; in the working state, the retrieval bag and the internal cutting mechanism are both extended out of the sheath tube;

[0012] The inner cutting mechanism is used for cutting the tissue in the receiving cavity when the retrieval bag is in a state of extending out of the sheath.

[0013] In an optional embodiment, the retrieval bag includes a bag body and a closing piece, the bag body enclosing the storage cavity; the closing piece is installed on the bag body, and the closing piece is used to close the opening when the retrieval bag is in a state of extending out of the sheath.

[0014] Based on the above scheme, when the excised tissue enters the storage cavity from the opening of the retrieval bag, the opening is closed by a closing piece, and then the tissue in the retrieval bag is cut by an internal cutting mechanism to reduce the volume of the tissue. The chopped tissue is not easy to leak from the opening and is not easy to fall into the human body, thereby improving the safety of the operation.

[0015] In an optional embodiment, the closing member is configured as a drawstring, and the closing member is slidably engaged with the sheath tube.

[0016] Based on the above solution, the drawstring has a certain degree of deformation ability and a strong storage capacity. The opening size of the retrieval bag can be changed by sliding relative to the sheath tube, which is easy to operate.

[0017] In an optional embodiment, the internal cutting type retriever further includes an anti-return member, which is located inside the sheath tube and the two are slidably matched, and the anti-return member has an initial position and a working position for switching. When in the initial position, the anti-return member has a distance from the distal end of the sheath tube so that the sheath tube can accommodate the retrieval bag and the internal cutting mechanism; when in the working position, the anti-return member is restricted in its freedom to slide toward the proximal end of the sheath tube, and the anti-return member is used to contact the retrieval bag to restrict the retrieval bag from retreating into the sheath tube.

[0018] Based on the above scheme, when tissue enters the retrieval bag and needs to be cut into multiple pieces, the drawstring is pulled to close the opening of the retrieval bag. If, when the drawstring is pulled to close the opening, the retrieval bag and the tissue therein enter the sheath tube under the pull of the drawstring, this will affect the internal cutting mechanism's cutting of the tissue, and there is a possibility that the tissue cannot be cut, thereby preventing the tissue in the retrieval bag from being cut into multiple small pieces, thereby affecting the subsequent process of removing the tissue from the body. Therefore, an anti-return member is installed in the sheath tube. When the anti-return member is in the initial position, a portion of the space in the sheath tube is reserved for the retrieval bag to be stored, and it will not interfere with the retrieval bag. When the retrieval bag is extended from the sheath tube, the anti-return member also moves from the initial position to the working position, and the anti-return member is relatively fixed to the sheath tube. When the drawstring is pulled to close the opening, as the retrieval bag approaches the sheath tube along with the drawstring, the retrieval bag is blocked by the anti-return member and does not enter the sheath tube, thereby effectively preventing the retrieval bag from being pulled into the sheath tube along with the drawstring, making the operation safer and more reliable.

[0019] In an optional embodiment, the sheath is provided with a first clamping portion, and the anti-retraction member is provided with a second clamping portion, and the first clamping portion and the second clamping portion are used for clamping and fitting when the anti-retraction member is in the working position.

[0020] Based on the above solution, the first clamping part and the second clamping part cooperate to enable the anti-retraction part to be automatically locked when sliding to the working position. The locking structure of the anti-retraction part and the sheath is simple, flexible to operate, and structurally stable, with good anti-retraction effect.

[0021] In an optional embodiment, the bag body has a bag bottom opposite to the opening, and at least a portion of the bag bottom is configured as a foldable structure. The foldable structure surrounds a storage bin with adjustable length. The storage bin is used to store tissue located in the storage cavity, and the storage bin can adaptively lengthen under the squeezing of the tissue.

[0022] Based on the above scheme, by setting up a foldable structure, initially, the foldable structure is in a fully folded state, with a small size, which is convenient for being stored in the sheath. When the retrieval bag extends out of the sheath, the foldable structure is not constrained by the sheath and can adaptively deform. That is, the cut tissue is located in the storage cavity. When the tissue needs to be recovered, the sheath is operated to drive the retrieval bag and the internal cutting mechanism into the instrument channel (such as the endoscope channel). The open side of the retrieval bag enters the instrument channel first. As the volume of the retrieval bag and tissue entering the instrument channel increases, when the tissue and the retrieval bag are blocked by the port of the instrument channel, the tissue is cut into multiple pieces of smaller tissue. The fragmented tissue can enter the storage bin under the action of external force, and the storage bin can adaptively lengthen after the tissue enters, and can re-plan the distribution of the multiple pieces of fragmented tissue, so that the retrieval bag and the fragmented tissue can smoothly enter the instrument channel.

[0023] In an optional embodiment, the opening area of ​​the storage bin gradually decreases in a direction from the opening to the bag bottom.

[0024] Based on the above scheme, since the storage bin is set to a gradual type, when the storage bin is in a folded state, part of its folded position can be located in the storage cavity, which rationally utilizes the space of the storage cavity, reduces the height after folding, and reduces the volume after folding, which is conducive to operation in an environment with limited space.

[0025] In an optional embodiment, the internal cutting mechanism includes a cutting wire, which is slidably engaged with the retrieval bag and the sheath tube at the same time, and the cutting wire encloses a cutting area with an adjustable size.

[0026] Based on the above solution, the tissue is cut by pulling the cutting wire, which is convenient and flexible to operate. In addition, the cutting wire is small in size and can be adaptively deformed, which is conducive to maintaining the original shape and also convenient for storage in the sheath after cutting.

[0027] In an optional embodiment, the cutting wire is pre-fixed to the retrieval bag.

[0028] Based on the above solution, after the retrieval bag and the inner cutting mechanism extend out of the sheath, before the tissue is cut, the initial shape of the cutting wire is more stable, which is conducive to the tissue entering the cutting area, thereby facilitating the cutting of the tissue.

[0029] In an optional embodiment, there are multiple cutting wires, one ends of the multiple cutting wires are gathered and located in the receiving cavity, and the multiple cutting wires cooperate to form a plurality of cutting areas.

[0030] Based on the above solution, a larger amount of chopped tissue can be obtained by cooperating with multiple cutting wires. The volume of each chopped tissue is smaller, which is more convenient to remove from the body.

[0031] In an optional embodiment, the internal cutting mechanism further includes a pull cable, which is simultaneously connected to the other end of the plurality of cutting wires away from the receiving cavity, and the pull cable is slidably disposed in the sheath.

[0032] Based on the above solution, multiple cutting wires can be driven to move simultaneously by pulling the cable, and the multiple cutting wires cooperate to perform tissue cutting, which is convenient and quick to operate.

[0033] The beneficial effects of the embodiments of the present invention include, for example:

[0034] 1. An anti-return device is installed inside the sheath. When the anti-return device is in its initial position, it leaves space inside the sheath for the retrieval bag to be stored, preventing interference with the bag. When the retrieval bag is extended from the sheath, the anti-return device also moves from its initial position to its working position, and the anti-return device is relatively fixed to the sheath. When the drawstring is pulled to close the opening, the retrieval bag is blocked by the anti-return device as it approaches the sheath along with the drawstring, preventing it from entering the sheath. This effectively prevents the retrieval bag from being pulled into the sheath along with the drawstring, making operation safer and more reliable.

[0035] 2. Achieve double cutting of the target tissue (whereas the prior art can only achieve one cutting), that is: under the guidance of the endoscope, the multifunctional retrieval device enters the set position of the human body. After the target tissue is cut, the target tissue falls from the opening into the storage cavity and is collected by the retrieval bag. Then, the target tissue in the retrieval bag can be cut again in the body using the internal cutting mechanism, so that the target tissue is formed into multiple smaller pieces of minced tissue. In the natural channel (such as the urethra) or the instrument channel (such as the endoscope channel), it is convenient for the retrieval bag and the minced tissue to be removed through the natural channel or the instrument channel.

[0036] 3. An internal cutting mechanism is provided. Since the target tissue is cut inside the body, it is not exposed to the outside world, which improves surgical efficiency and reduces the risk of infection. After the large target tissue is cut into multiple small pieces, it can be applied to small-diameter natural channels of the human body, such as the urethra. After the target tissue is cut, it can be removed, reducing the surgical wound, achieving non-invasive surgery, improving surgical efficiency, reducing surgical risks, and shortening the patient's recovery time.

[0037] 4. The foldable structure allows for adjustable storage compartment length. The longer the compartment, the larger its volume, allowing it to accommodate more tissue. Because the foldable structure offers a certain degree of stability, in its initial state, it is fully folded, compact, and easily accommodated in the sheath.

[0038] In summary, the internal cutting type retriever provided in this embodiment, through the cooperation of the retrieval bag and the internal cutting mechanism, can utilize the internal cutting mechanism to re-cut the tissue in the retrieval bag in the body, so that the tissue forms multiple smaller pieces of broken tissue. Since the volume of each piece of broken tissue is small, when the retrieval bag is used to remove the tissue from the body, the broken tissue in the retrieval bag is easier to deform and is not easy to get blocked in the natural channel (such as the urethra) or the instrument channel (such as the endoscope channel), which facilitates the retrieval bag and the broken tissue to be removed through the natural channel or the instrument channel. Since the tissue is cut in the body, the exposure of the tissue is avoided, the surgical efficiency is improved and the risk of infection is reduced. After the larger piece of tissue is cut into multiple small pieces of broken tissue, it can be applied to small-diameter natural channels of the human body, such as the urethra, etc., and the tissue can be removed after cutting, reducing the surgical wound and achieving non-invasive surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is a schematic diagram of an internal cutting type extractor according to an embodiment of the present application;

[0041] Figure 2 This is a partial cross-sectional schematic diagram of the internal cutting type extractor according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram of a retrieval component according to an embodiment of the present application;

[0043] Figure 4 Schematic diagram of the internal cutting mechanism and anti-retraction component of an embodiment of the present application.

[0044] icon:

[0045] 100-sheath; 110-first lumen; 120-second lumen; 130-limiting surface; 140-first clamping part; 200-removal assembly; 210-removal bag; 211-bag body; 212-closing piece; 213-foldable structure; 214-storage cavity; 215-storage bin; 220-internal cutting mechanism; 221-cutting wire; 222-pull rope; 223-cutting area; 300-handle assembly; 400-anti-retraction piece; 410-second clamping part. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] 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 invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0049] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0051] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0052] In the prior art, when removing tissue using the retrieval bag 210 , due to the large volume of the tissue, generally only invasive surgery can be performed, resulting in low surgical efficiency and a long recovery period.

[0053] In view of this, the designer provides an internal cutting extractor, which can cut tissue in the body to form multiple small-volume fragments. The fragments have good permeability and can be directly removed from natural channels or instrument channels. It is not only suitable for minimally invasive surgery, but also for non-invasive surgery, and has a wide range of uses.

[0054] Please combine Figure 1-Figure 4In this embodiment, the internal cutting type retrieval device includes a sheath tube 100 and a retrieval assembly 200. The retrieval assembly 200 includes a retrieval bag 210 and an internal cutting mechanism 220. The retrieval bag 210 is provided with a storage cavity 214 with an opening, and the internal cutting mechanism 220 is installed in the retrieval bag 210. The retrieval assembly 200 has a switchable initial state and a working state. When in the initial state, the retrieval bag 210 and the internal cutting mechanism 220 are both located in the sheath tube 100; when in the working state, the retrieval bag 210 and the internal cutting mechanism 220 are both extended out of the sheath tube 100. The internal cutting mechanism 220 is used to cut the tissue located in the storage cavity 214 when the retrieval bag 210 is in a state of extending out of the sheath tube 100.

[0055] As described above, the internal cutting type extractor provided in this embodiment works as follows:

[0056] The internal cutting type retriever can be used in conjunction with surgical instruments such as an endoscope. Under the guidance of the endoscope, the internal cutting type retriever enters a set position in the human body. After the target tissue is cut, the target tissue falls from the opening into the storage cavity 214 and is stored in the retrieval bag 210. Then, the internal cutting mechanism 220 can be used to cut the target tissue in the retrieval bag 210 again in the body, so that the target tissue is formed into multiple smaller pieces of minced tissue. Since the volume of each piece of minced tissue is small, when the minced tissue is removed from the body using the retrieval bag 210, the minced tissue in the retrieval bag 210 is easier to deform and is not easy to be blocked in the natural channel (such as the urethra) or the instrument channel (such as the endoscope channel), thereby facilitating the retrieval bag 210 and the minced tissue to be removed through the natural channel or the instrument channel. Since the target tissue is cut in the body, the target tissue is avoided from being exposed, the surgical efficiency is improved and the risk of infection is reduced. After the larger target tissue is cut into multiple small pieces of broken tissue, it can be applied to small-diameter natural human channels, such as the urethra. The target tissue can be removed after cutting, reducing surgical wounds, achieving non-invasive surgery, improving surgical efficiency, reducing surgical risks, and shortening patient recovery time.

[0057] The following embodiments illustrate the details of the internal cutting extractor of the present application by way of examples.

[0058] Please combine Figure 1-Figure 4In this embodiment, optionally, the internal cutting type retriever includes a sheath tube 100, a retrieval assembly 200 and a handle assembly 300. The retrieval assembly 200 is installed on the sheath tube 100, and the handle assembly 300 is installed on the sheath tube 100 and connected to the retrieval assembly 200, and can adjust the position of the retrieval assembly 200 relative to the sheath tube 100. For example, initially, the retrieval assembly 200 is located inside the sheath tube 100, which makes it convenient to transport the internal cutting type retriever to a set position on the human body. When it is necessary to use the retrieval assembly 200 to collect tissue, the handle assembly 300 is operated to push the retrieval assembly 200 out of the sheath tube 100 so that the retrieval assembly 200 extends out of the distal end of the sheath tube 100.

[0059] Please combine Figure 1-Figure 2 In this embodiment, the sheath 100 can optionally be configured as a flexible tube to adapt to the shape of a natural passage or an instrument passage in the human body, facilitating the sheath 100's entry and exit from the natural passage or instrument passage. The sheath 100 has opposing proximal and distal ends, the proximal end being the end closest to the operator and the distal end being the end that enters the patient. The lumen of the sheath 100 includes a first lumen 110 and a second lumen 120 that are connected. The end of the first lumen 110 that is distal to the second lumen 120 is the distal end. Both the first lumen 110 and the second lumen 120 can be circular channels, with the diameter of the first lumen 110 being larger than the diameter of the second lumen 120. An annular limiting surface 130 is formed at the connection between the first lumen 110 and the second lumen 120. Furthermore, a first clamping portion 140 is provided on the inner wall surface of the sheath 100 corresponding to the first lumen 110. The first clamping portion 140 can be a clamping groove, which can be an annular groove disposed around the axis of the sheath 100.

[0060] Please combine Figure 1-Figure 4 In this embodiment, the retrieval assembly 200 optionally includes a retrieval bag 210 and an internal cutting mechanism 220. The internal cutting mechanism 220 is mounted on the retrieval bag 210, and the retrieval bag and the internal cutting mechanism 220 can be simultaneously accommodated in the sheath tube 100. The retrieval bag and the internal cutting mechanism 220 can also move relative to each other when located outside the sheath tube 100, thereby utilizing the internal cutting mechanism 220 to cut the target tissue located in the retrieval bag 210.

[0061] Please combine Figure 2 and Figure 4Optionally, the taking bag 210 comprises a bag body 211 and a closing member 212. One side of the bag body 211 is provided as an opening, and at least part of the bag bottom opposite to the opening of the bag body 211 is provided as a foldable structure 213. For example, in the embodiment, the middle part of the bag bottom is provided as the foldable structure 213. The foldable structure 213 has a plurality of annular folds. The foldable structure 213 can be folded at the annular folds, so as to realize adjustment of the overall length. That is, when the foldable structure 213 has more folding positions, the height of the foldable structure 213 is small, and when the foldable structure 213 has fewer folding positions, the foldable structure 213 is unfolded, and at this time, the height of the foldable structure 213 is higher. Meanwhile, the foldable structure 213 is a hollow structure. The hollow area of the foldable structure 213 is a storage bin 215. The storage bin 215 is connected to the storage cavity 214, and can accommodate the tissues in the storage cavity 214. Due to the design of the foldable structure 213, the length of the storage bin 215 can be adjusted. The longer the length of the storage bin 215 is, the larger the volume is, and more tissues can be accommodated. Due to the stability of the foldable structure 213, in the initial state, the foldable structure 213 is in a completely folded state, the volume is small, and it is beneficial to be accommodated in the sheath tube 100.

[0062] It should be understood that in some embodiments, the bag bottom can be entirely provided as the foldable structure 213.

[0063] Further, the opening area of the storage bin 215 surrounded by the foldable structure 213 gradually decreases in the direction from the opening of the bag body 211 to the bag bottom. That is, the storage bin 215 is provided as a gradient structure. When the storage bin 215 is in the folded state, part of the folding position of the storage bin 215 can be located in the storage cavity 214, the space of the storage cavity 214 is reasonably utilized, the overall height of the foldable structure 213 after folding is reduced, the volume after folding is reduced, it is beneficial to be accommodated in the sheath tube 100, and it is also beneficial to work in an environment with limited space.

[0064] It should be noted that during the operation, the target tissue is cut into a plurality of small-volume fragmented tissues, and the fragmented tissues are located in the storage cavity 214. When the fragmented tissues need to be recovered, the bag body 211 and the inner cutting mechanism 220 are kept stationary relative to the sheath tube 100, and the sheath tube 100 is operated to drive the bag body 211 and the inner cutting mechanism 220 to enter the instrument channel together. The opening side of the bag body 211 is in a closed state and enters the instrument channel first. As the volume of the bag body 211 and the fragmented tissues entering the instrument channel increases, when the fragmented tissues and the bag body 211 are blocked by the port of the instrument channel, due to the small volume of the fragmented tissues, the fragmented tissues have strong deformation ability and can enter the storage bin 215 under the action of external force. After the fragmented tissues enter, the storage bin 215 can adaptively lengthen, and the distribution of the plurality of fragmented tissues can be re-planned, so that the bag body 211 and the fragmented tissues can smoothly enter the instrument channel.

[0065] Optionally, the closing member 212 is configured as a drawstring, which is slidably connected to the edge of the bag body 211 that forms the opening. Both ends of the drawstring are inserted into the sheath 100 and connected to the handle assembly 300. The handle assembly 300 can drive the drawstring to move, thereby closing the opening. In other words, when the retrieval bag 210 extends out of the sheath 100, the opening is in an open state, and the target tissue can easily enter the storage chamber 214 through the opening. When the internal cutting mechanism 220 is needed to cut the target tissue, the drawstring is first pulled to drive the bag body 211 to move and close the opening. The internal cutting mechanism 220 is then used to cut the target tissue in the retrieval bag 210. The shredded tissue formed after cutting is not easy to leak from the opening and is not easy to fall into the human body, thereby improving the safety of the operation. The drawstring has strong deformation ability and good adaptability, which is convenient for storage and operation.

[0066] It should be understood that the drawstring can be passed through a channel provided at the edge of the opening of the bag body 211 .

[0067] Please combine Figure 1 、 Figure 3 and Figure 4 Optionally, the internal cutting mechanism 220 includes a cutting wire 221 and a pull cable 222. The cutting wire 221 encloses a cutting area 223 of adjustable size. The cutting wire 221 is installed in the bag body 211. The cutting wire 221 can be pre-fixed to the inner wall surface of the bag body 211 to maintain a set shape. When the target tissue enters the storage cavity 214 and contacts the cutting wire 221, the target tissue is not likely to destroy the shape of the cutting wire 221, making it easy for the target tissue to enter the cutting area 223, thereby facilitating the use of the cutting wire 221 to cut the target tissue. At the same time, the cutting wire 221 is inserted into the sheath tube 100 and is connected to the pull cable 222. The pull cable 222 is connected to the handle assembly 300. Both the cutting wire 221 and the pull cable 222 can slide relative to the sheath tube 100. During operation, force can be applied to the handle assembly 300 to drive the cutting wire 221 to move through the rope 222. The cutting wire 221 is first separated from the bag body 211 at a pre-fixed position, and then the cutting wire 221 moves relative to the target tissue. The cutting area 223 surrounded by the cutting wire 221 gradually decreases until the target tissue is cut, so that the target tissue is cut into multiple smaller pieces of tissue in the bag body 211. The operation is convenient and flexible.

[0068] It should be understood that the cutting wire 221 and the bag body 211 may be pre-fixed by bonding or the like.

[0069] In addition, it should be noted that the number of cutting wires 221 can be one or more. When there is only one cutting wire 221, one cutting wire 221 can enclose a cutting area 223; when there are multiple cutting wires 221, multiple cutting wires 221 can cooperate to form multiple cutting areas 223, thereby cutting the target tissue into multiple pieces. Specifically, when there are multiple cutting wires 221, the distal ends of the multiple cutting wires 221 are gathered and located in the storage cavity 214, and the proximal ends of the multiple cutting wires 221 are connected to the pull rope 222. By pulling the pull rope 222, the multiple cutting wires 221 can be driven to move simultaneously, which is convenient and quick to operate.

[0070] For example, in this embodiment, the number of cutting wires 221 is three, and the three cutting wires 221 form two cutting areas 223, which can cut the target tissue into three pieces of minced tissue. Obviously, in other embodiments, the number of cutting wires 221 can be selected as needed.

[0071] In addition, part of the cutting wire 221 is located at the upper opening of the storage bin 215 , which can limit the target tissue from directly entering the storage bin 215 from the storage cavity 214 .

[0072] Please combine Figure 2 In this embodiment, the internal cutting type retriever optionally further includes an anti-return member 400, which is located inside the sheath tube 100 and the two are slidably matched. The anti-return member 400 has a switchable initial position and a working position. When in the initial position, the anti-return member 400 is spaced apart from the distal end of the sheath tube 100 so that the sheath tube 100 can accommodate the retrieval bag 210 and the internal cutting mechanism 220; when in the working position, the anti-return member 400 is restricted from sliding toward the proximal end of the sheath tube 100. The anti-return member 400 is used to contact the retrieval bag 210 to restrict the retrieval bag 210 from retracting into the sheath tube 100. It should be understood that when the anti-return member 400 is in the initial position, part of the space inside the sheath tube 100 is reserved for storing the bag body 211, and will not interfere with the bag body 211. When the bag 211 is extended from the sheath 100, the anti-return member 400 also moves from the initial position to the working position, and the anti-return member 400 is fixed relative to the sheath 100. During the operation, when the drawstring is pulled to close the opening, the bag 211 is blocked by the anti-return member 400 as it approaches the sheath 100 along with the drawstring, and the bag 211 does not enter the sheath 100, thereby effectively preventing the bag 211 from being pulled into the sheath 100 along with the drawstring. The cutting wire 221 can smoothly cut the target tissue, thereby improving the success rate of the operation.

[0073] Optionally, the anti-return member 400 can be set as a cylinder, and a second clamping portion 410 is provided on the outer peripheral surface of the anti-return member 400, and the second clamping portion 410 can be set as an annular protrusion. The anti-return member 400 can be slidably arranged in the first lumen of the sheath tube 100. When the anti-return member 400 is in the initial position, the proximal end of the anti-return member 400 contacts the limiting surface 130, thereby positioning the position of the bag body 211 in the sheath tube 100. When the anti-return member 400 is in the working position, the second clamping portion 410 is engaged with the first clamping portion 140, and the freedom of the anti-return member 400 and the sheath tube 100 in the extension direction of the sheath tube 100 is limited. The combination of the anti-return member 400 and the sheath tube 100 is stable and reliable, and can effectively prevent the bag body 211 from retreating into the sheath tube 100 under the pull of the pull rope. When the anti-retraction member 400 slides from the initial position to the working position, the first clamping portion 140 and the second clamping portion 410 are automatically clamped and matched, which is convenient for operation.

[0074] It should be understood that in some embodiments, the first clamping portion 140 may be a protrusion, and correspondingly, the second clamping portion 410 may be a groove that cooperates with the protrusion.

[0075] Furthermore, the pull cord and the cable 222 are both inserted into the anti-return member 400 and can be pre-fixed with the anti-return member 400. Thus, when the handle assembly 300 is used to drive the pull cord and the cable 222 to move, causing the bag body 211 and the inner cutting mechanism 220 to move from an initial position to an operating position, the pull cord and the cable 222 can transmit external force to the anti-return member 400, causing the anti-return member 400 to move from an initial position to an operating position. This eliminates the need for an additional structure for adjusting the position of the anti-return member 400, resulting in a simple structure and low cost. For example, the pull cord and the cable 222 can be pre-fixed with the anti-return member 400 by bonding or other means.

[0076] It should be noted that the handle assembly 300 can be provided with a separate sliding handle that cooperates with the pull rope and the cable 222, so that the pull rope or the cable 222 can be independently adjusted for ease of operation. Obviously, in some embodiments, the pull rope and the cable 222 can also be adjusted simultaneously by a single operating handle. When the single operating handle is used for adjustment, when the pull rope is pulled to close the opening, the cable 222 does not perform the cutting action. After the pull rope closes the opening, the operating handle is continuously applied to drive the cable 222 to move and perform the cutting action.

[0077] The internal cutting retrieval device provided in this embodiment employs a cutting wire 221 disposed within a retrieval bag 210. Pulling a cable 222 drives the cutting wire 221 to cut the target tissue within the retrieval bag 210. The resulting fragments are small in size, making them easier to retrieve, effectively alleviating the difficulty traditional retrieval bags 210 have in handling large tissue volumes. Furthermore, since the target tissue is cut into multiple fragments within the body, the fragments are small in size, requiring less channel size, making them suitable for natural channels such as the urethra, and demonstrating excellent versatility and adaptability.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An internal cutting device for minimally invasive surgery, characterized in that: It comprises a sheath tube (100) and a collection assembly (200), wherein: The retrieval assembly (200) comprises a retrieval bag (210) and an internal cutting mechanism (220), wherein the retrieval bag (210) is provided with a receiving cavity (214) having an opening, and the internal cutting mechanism (220) is installed on the retrieval bag (210); the retrieval assembly (200) has a switchable initial state and a working state, wherein in the initial state, the retrieval bag (210) and the internal cutting mechanism (220) are both located in the sheath tube (100); and in the working state, the retrieval bag (210) and the internal cutting mechanism (220) are both extended out of the sheath tube (100); The internal cutting mechanism (220) is used to cut tissue located in the receiving cavity (214) when the retrieval bag (210) is in a state of extending out of the sheath tube (100).

2. The internal cutting type extractor according to claim 1, characterized in that: The retrieval bag (210) comprises a bag body (211) and a closing piece (212), wherein the bag body (211) encloses the receiving cavity (214); the closing piece (212) is mounted on the bag body (211), and is used to close the opening when the retrieval bag (210) is in a state of extending out of the sheath tube (100).

3. The internal cutting type extractor according to claim 2, characterized in that: The closing member (212) is configured as a drawstring, and the closing member (212) is slidably matched with the sheath tube (100).

4. The internal cutting type extractor according to claim 3, characterized in that: The internal cutting type retriever also includes an anti-return part (400), which is located in the sheath tube (100) and the two are slidably matched. The anti-return part (400) has an initial position and a working position for switching. When in the initial position, the anti-return part (400) has a distance from the distal end of the sheath tube (100) so that the sheath tube (100) can accommodate the retrieval bag (210) and the internal cutting mechanism (220); when in the working position, the freedom of the anti-return part (400) to slide toward the proximal end of the sheath tube (100) is restricted, and the anti-return part (400) is used to contact the retrieval bag (210) to restrict the retrieval bag (210) from retreating into the sheath tube (100).

5. The internal cutting type extractor according to claim 4, characterized in that: The sheath tube (100) is provided with a first clamping portion (140), and the anti-retraction member (400) is provided with a second clamping portion (410). The first clamping portion (140) and the second clamping portion (410) are used for clamping and matching when the anti-retraction member (400) is in the working position.

6. The internal cutting type extractor according to any one of claims 2 to 5, characterized in that: The bag body (211) has a bag bottom opposite to the opening, at least a portion of the bag bottom is configured as a foldable structure (213), the foldable structure (213) surrounds a storage bin (215) with adjustable length, the storage bin (215) is used to store tissue located in the storage cavity (214), and the storage bin (215) can adaptively lengthen under the squeezing of the tissue.

7. The internal cutting type extractor according to claim 6, characterized in that: The opening area of ​​the storage bin (215) gradually decreases in the direction from the opening to the bag bottom.

8. The internal cutting type extractor according to any one of claims 1 to 5, characterized in that: The internal cutting mechanism (220) includes a cutting wire (221), which is slidably matched with the retrieval bag (210) and the sheath (100) at the same time, and the cutting wire (221) encloses a cutting area (223) of adjustable size; the cutting wire (221) is pre-fixed to the retrieval bag (210).

9. The internal cutting type extractor according to claim 8, characterized in that: The inner cutting mechanism (220) further comprises a cable (222), the cable (222) being simultaneously connected to the other end of the plurality of cutting wires (221) away from the receiving cavity (214), and the cable (222) being slidably disposed in the sheath tube (100).

10. The internal cutting type extractor according to claim 8, characterized in that: There are multiple cutting wires (221), one end of each of the multiple cutting wires (221) is gathered together and located in the receiving cavity, and the multiple cutting wires (221) cooperate to form multiple cutting areas (223).

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