Foreign body removal device

Abstract

Disclosed is a foreign body removal device, relating to the field of medical instruments. The foreign body removal device comprises a foreign body removal part (100), an adjustment part (200), and an operation part (500). One end of the foreign body removal part (100) is weaved and gathered to form a gathered part (120), the operation part (500) is fixedly connected to the tail end of the gathered part (120), the adjustment part (200) is annularly arranged on the outer side of the gathered part (120), and one end of the adjustment part (200) is fixedly connected to the operation part (500). The overall diameter of the foreign body removal device is extremely small, which is reduced by 50% or more compared with the overall diameter of a traditional stone removal basket product, and the foreign body removal device can be directly fed into a smaller cavity. The positions such as the biliary tract and the intestine can be easily reached, and meanwhile, the effective rotation of the foreign body removal part (100) can be ensured under various bends, thereby greatly expanding the application range of stone removal and foreign body treatment.

Description

Foreign matter removing device TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, and in particular, to a foreign matter removing device. BACKGROUND

[0002] The existing foreign matter removing devices are mostly stone removing baskets or nets or foreign matter forceps. In a sub-laparoscope lithotripsy surgery, the instrument channel of the sub-laparoscope has a small diameter, and when used with the traditional foreign matter removing device, the sheath tube has a large diameter, so other instruments need to be withdrawn before the foreign matter removing device is introduced again. This affects the accuracy of the second entry position of the foreign matter removing device, and in the case of multiple instrument collaborative operation, the large diameter of the foreign matter removing device occupies the operation space of other instruments, resulting in the inability to work collaboratively with other instruments.

[0003] Especially when used for removing foreign matter in the pancreatic and biliary tract, the pancreatic and biliary tract is relatively narrow and has many small branches, and when entering through the duodenal papilla, the foreign matter removing device needs to have a long length and good bending performance, but the current net basket can only achieve the effects of easy bending, poor pushing or good pushing but not suitable for bending; due to the diameter and performance of the net basket cannot meet the requirements, the current foreign matter removing device cannot realize long-distance operation under a small diameter.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The purpose of the present application includes, for example, providing a foreign matter removing device with the characteristics of small diameter, long length, easy bending and good pushing, which is beneficial to operation in a small cavity under a long span.

[0006] The embodiments of the present application can be implemented as follows:

[0007] In a first aspect, the present application provides a foreign matter removing device, comprising a foreign matter removing part, an adjusting part and an operating part;

[0008] One end of the foreign matter removing part is formed into a convergence part by at least two wires being longitudinally staggered, and the operating part is fixedly combined at the end of the convergence part;

[0009] The adjusting part is configured to adjust the flexibility at the convergence part, and the adjusting part is annularly arranged outside the convergence part, one end of the adjusting part is fixedly connected with the operating part, and the adjusting part comprises an inner channel extending longitudinally therethrough;

[0010] An active gap is provided between the end of the adjusting part away from the operating part and the convergence part, and the active gap is configured to allow the end of the adjusting part away from the operating part to change the relative position and rotate relative to the foreign matter removing part.

[0011] The position relationship of one end of the foreign matter taking-out part, one end of the adjusting part and the operating part is relatively fixed.

[0012] In an optional embodiment, the adjusting part is tubular, and a groove for facilitating bending of the adjusting part is arranged on the adjusting part in a circumferential direction.

[0013] In an optional embodiment, the adjusting part is a spring tube.

[0014] In an optional embodiment, the outer diameters of the adjusting part and the operating part are substantially the same.

[0015] In an optional embodiment, the converging part is formed by weaving a plurality of wires.

[0016] In an optional embodiment, the adjusting part is further provided with a developing section, which is arranged at one end of the adjusting part away from the operating part.

[0017] In an optional embodiment, the developing section is fixedly connected with or integrally formed with the adjusting part; or the developing section is obtained by arranging a developing coating on the adjusting part.

[0018] In an optional embodiment, a smooth end part is arranged at one end of the developing section away from the operating part.

[0019] In an optional embodiment, a marking area is arranged at one end of the operating part away from the adjusting part.

[0020] In an optional embodiment, a smooth end part is arranged at one end of the operating part away from the adjusting part.

[0021] In an optional embodiment, a connecting tube is sleeved and fixed at the connection between the operating part and the converging part, and one end of the adjusting part is sleeved on the connecting tube and fixed with the connecting tube.

[0022] In an optional embodiment, the rigidity of the adjusting part is smaller than that of the operating part.

[0023] The beneficial effects of the embodiments of the present application include, for example:

[0024] The foreign matter taking-out device in the present application has an extremely thin overall diameter, and does not need to be provided with an outer sheath tube required by a traditional basket, and the overall diameter is reduced by more than 50% compared with a traditional stone taking basket product, which can be directly sent into a smaller cavity. Meanwhile, the adjusting part improves the axial rigidity and radial support of the front end of the foreign matter taking-out part, and has better pushing and supporting properties than a single nickel-titanium alloy wire woven basket, and can easily reach the positions of bile ducts, intestines and the like, and can also guarantee effective rotation of the foreign matter taking-out part under various bends, greatly expanding the application range of stone taking and foreign matter treatment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the structure of a foreign object removal device in one embodiment of this application;

[0027] Figure 2 is a schematic diagram of the foreign object removal device in another embodiment of this application;

[0028] Figure 3 is a schematic diagram of the structure of the first type of retrieval basket;

[0029] Figure 4 is a schematic diagram of the structure of the second type of retrieval basket;

[0030] Figure 5 is a schematic diagram of the third type of retrieval basket;

[0031] Figure 6 is a schematic diagram of the structure of the first type of convergence section;

[0032] Figure 7 is a schematic diagram of the structure of the second type of convergence section;

[0033] Figure 8 is a schematic diagram of an operating part;

[0034] Figure 9 is a partial structural schematic diagram of Figure 2;

[0035] Figure 10 is a schematic diagram of the foreign object removal device and the sub-lens working together;

[0036] Figure 11 is an enlarged view of part A of Figure 11;

[0037] Figure 12 is a structural diagram showing the connection position between the adjustment section and the operation section.

[0038] Icons: 100-Foreign object removal section; 110-Retrieval basket; 120-Gathering section; 200-Adjustment section; 400-Developing section; 500-Operating section; 510-Marking area; 520-Rounded end; 530-Core; 600-Connecting tube; 700-Sub-lens. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0041] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, only for the convenience of describing the application and simplifying the description, and it does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0043] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0045] Please refer to FIG. 1 and FIG. 2, the embodiment provides a foreign matter taking-out device, comprising a foreign matter taking-out part 100, an adjusting part 200 and an operating part 500;

[0046] One end of the foreign matter taking-out part 100 is formed into a converging part 120 by at least two wires arranged longitudinally staggered, and the operating part 500 is fixedly combined at the end of the converging part 120;

[0047] The adjusting part 200 is configured to adjust the softness at the converging part 120, the adjusting part 200 is annularly arranged outside the converging part 120, one end of the adjusting part 200 is fixedly connected with the operating part 500, and the adjusting part 200 comprises an inner passage extending longitudinally therethrough;

[0048] An active gap is arranged between the end of the adjusting part 200 away from the operating part 500 and the converging part 120, and the active gap is configured to allow the end of the adjusting part 200 away from the operating part 500 to have relative positional change and relative rotation with the foreign matter taking-out part 100;

[0049] The position relationship of one end of the foreign object extraction part 100, one end of the adjusting part 200, and the three of the operation part 500 is relatively fixed.

[0050] In some embodiments, the convergence part 120 is formed by weaving several wires.

[0051] In some embodiments, the foreign object extraction part 100 includes a foreign object basket 110 formed by winding two or more wires, and the ends of the two or more wires are woven together to form a convergence part 120.

[0052] The material of the foreign object basket 110 in the present application can be a memory alloy to prevent the foreign object basket 110 from loosening. The foreign object basket 110 is directly gathered by weaving wires, which is different from the traditional form of needing riveting pipes and other auxiliary gathering. After gathering, the weaving continues to form a convergence part 120, which increases the softness of the foreign object extraction part 100 and facilitates the entry into more complex bends.

[0053] Referring to FIGS. 3-5, as one of the weaving methods, one of the wires of the foreign object extraction part 100 includes a foreign object basket 110 at the head end and a convergence part 120 at the tail end, the foreign object basket 110 is in an overall elliptical shape, spiral shape, or triangular shape, and the ends of the two or more branch wires at the tail end are woven together to form the convergence part 120. Referring to FIGS. 6 and 7, as one of the weaving methods, the structure of the convergence part 120 can be arranged such that the first branch and the second branch extend in an overall spiral shape, and the first branch and the second branch are intertwined with each other. As another weaving method, the structure of the convergence part 120 can be arranged such that the first branch extends in an overall straight line, the second branch extends in an overall spiral shape, and the second branch is wound on the outer surface of the first branch.

[0054] In some embodiments, the length of the foreign object basket 110 along the axis of the convergence part 120 is greater than the length along the radial direction of the convergence part 120, which is conducive to causing the foreign object extraction part 100 to be gathered along the axis direction when being pressed. In some embodiments, the length of the convergence part 120 is greater than 20% of the total length of the foreign object extraction part 100, which is conducive to ensuring the softness of the foreign object extraction part 100 and facilitating the entry into more complex bends.

[0055] In the present application, the foreign object extraction part 100 is used to collect foreign objects to be extracted, the operation part 500 is used for an operator to control the movement and rotation of the foreign object extraction device, and the convergence part 120 of the foreign object extraction part 100 is directly connected to the operation part 500.

[0056] Specifically, referring to Fig. 8, as an embodiment, the operation part 500 is divided into a mandrel 530 part and a winding cable part, the winding cable part is wound around the mandrel 530 part, and the winding cable part is fixedly connected with the mandrel 530 part, the fixedly connected manner includes but is not limited to welding, bonding or other ways capable of realizing relative fixation of the two. The end of the winding cable part close to the convergence part 120 continues to extend after completely covering the mandrel 530 part, the extended part is arranged around the outside of the convergence part 120, and is fixedly connected with the convergence part 120, and the fixedly connected manner includes but is not limited to welding, bonding or other ways capable of realizing relative fixation of the two.

[0057] As another embodiment, the convergence part 120 and the operation part 500 as a whole can also adopt welding, bonding or other ways capable of realizing relative fixation of the two.

[0058] The adjustment part 200 is arranged around the outside of the convergence part 120, and can advance and retreat together with the foreign matter taking-out part 100 under the control of the operation part 500; when the operation part 500 is rotated, the foreign matter taking-out part 100 rotates together. The adjustment part 200 can enhance the radial support ability of the convergence part 120, and at the same time enhance the pushing property, so as to improve the ability of the foreign matter taking-out part 100 to pass through a complex cavity. It should be noted that if the material of each part of the foreign matter taking-out device of the present application is not particularly specified, a conventional material in medical instruments can be selected, such as nickel-titanium alloy, memory alloy, etc.

[0059] The existing sheath tube net basket has consistent overall strength and rigidity, and the present application is different from the existing sheath tube net basket in that the adjustment part 200 and the convergence part 120 are combined to form the front part of the foreign matter taking-out device, and the operation part 500 is the rear part of the foreign matter taking-out device; the rigidity of the adjustment part 200 is less than that of the operation part 500, and the rigidity of the front part is less than that of the rear part. The front part has the characteristics of good elasticity, relatively softness, easy passing through small bends and having certain support force, and the rear part has the characteristics of strong rigidity, good support force, certain elasticity, good pushing property.

[0060] Further, in actual use, as one of the instruments required for surgical operation, the foreign body removal device can be applied to the operation related to pancreatic and biliary ducts. The current sheath tube stone basket cannot be directly applied to the sub-scope 700 due to the defect of large diameter, and needs to be taken out first and then inserted into a larger channel. The foreign body removal device of the present application can be directly inserted into the sub-scope 700 of the pancreatic and biliary duct imaging catheter, as shown in Figures 10 and 11. Due to the characteristics of the pancreatic and biliary duct being relatively narrow and having many small branches, there may be a need for a small bend in the pancreatic and biliary duct imaging catheter. The front section of the foreign body removal device is used to pass through the small bend and plays a guiding role, and the rear section of the foreign body removal device is used to maintain the overall pushability and supportability.

[0061] When the front section of the foreign body removal device is too long, the front end is relatively soft, which will affect the overall pushability of the foreign body removal device, and the push-pull opening and closing performance and rotation performance of the foreign body removal device will be reduced. When the front section exceeds a certain range, the push resistance gradually increases with the growth of the soft section, and the rotation appears delayed or delayed response, resulting in a decrease in the overall performance of the foreign body removal device. In order to meet the actual use, through actual test, the length of the front section of the foreign body removal device is preferably 200-500mm, within this length range, the overall pushability of the foreign body removal device will not be affected, so that the foreign body removal device can meet the rigidity, pushability requirements, and also meet the bending degree requirements of the corresponding position.

[0062] The current technology generally uses a sheath tube basket, which has a large diameter and cannot meet the requirement of fine diameter. However, if the sheath tube of the sheath tube basket is removed, the product is directly applied to be easy to bend and poor in pushability, which leads to the fact that the sheath tube basket product cannot be obtained. If the overall strength of the basket is increased due to being too soft, the problem of being unable to pass through the bend will be caused. On the basis of the sheath tube fine diameter, the structure is changed to enhance the pushability without increasing the diameter. The overall diameter of the foreign body removal device in the present application is very fine, which can be as low as 0.8-1mm, which is more than 50% smaller than the overall diameter of the traditional stone basket product, and can be directly sent into a smaller cavity.

[0063] Compared with the basket part of the existing sheath tube basket, the structure of the convergence part 120 and the adjusting part 200 of the present application suspends the foreign body removal part 100 relative to the external cavity, which helps to ensure the effective rotation of the foreign body removal part 100 in various bends and expands the application range of stone removal treatment. The problem that the basket part of the existing sheath tube basket cannot be accurately operated in the endoscope channel without a sheath tube is solved, and the structure of the adjusting part 200 has good axial rigidity and radial support, so that the foreign body removal part 100 has better pushability and is beneficial to reach the positions of the biliary tract, intestinal tract, etc.

[0064] The structure matched by the converging portion 120 of the foreign matter taking-out portion 100 is different from the traditional form of relying on riveting to converge. The converging portion 120 relies on weaving to directly converge and lengthen, has the effect of controlling the diameter size and increasing the softness of the distal end, the design of the converging portion 120 makes the whole foreign matter taking-out portion 100 more slender, effectively reduces the friction with the cavity wall; realizes more softness, more easily bending and smoothly entering the complex cavity.

[0065] The segmented splicing form of the present application and the synchronous cooperation with the operating portion 500 increase the flexibility and action transmission of the foreign matter taking-out device, which can smoothly bend into a complex cavity.

[0066] The foreign matter taking-out device in the present application is applied to a pancreatic and biliary tract imaging catheter. There are two extreme bends in the use process of the catheter: ① duodenum entering the nipple (about 90°); ② pancreatic and bile duct mirror operation (about 180°). The foreign matter taking-out device in the present application is designed into two sections, the front end is flexible and soft and is suitable for bending, and plays a guiding role, and the tail end is harder and has better support, and plays a pushing role.

[0067] In some embodiments, the front end length can be 200-500mm. If the soft section of the front section is too long, it will cause performance degradation, which is specifically manifested in that the pushing resistance of the soft section gradually increases, and the rotation appears delay or delay response. Specifically, the front section length can be 30cm (calculation: 10+10+10=30cm; the gallbladder is pear-shaped, about 7-10cm long, the common bile duct is usually about 7-10cm long, and 10cm safety margin is reserved).

[0068] In some embodiments, the adjusting portion 200 is tubular, and a groove for facilitating bending of the adjusting portion is arranged on the adjusting portion 200 in a circumferential direction; preferably, the adjusting portion 200 is a spring tube.

[0069] The adjusting portion 200 can bend in any radial direction, and is not easy to compress in the axial direction, so as to ensure the supporting capacity of the converging portion 120 and strengthen the pushing capacity of the foreign matter taking-out portion 100.

[0070] The adjusting portion 200 can also be a structure similar to a snake bone tube, which ensures the strength of the reinforcing tube while enabling the reinforcing tube to be bent.

[0071] In some embodiments, an active gap is arranged between the end of the adjusting portion 200 away from the operating portion 500 and the converging portion 120.

[0072] When the adjusting part 200 is blocked from rotating, because an active gap is provided between the distal end of the adjusting part 200 away from the operating part 500 (the end close to the operating part 500 is the proximal end, and the end close to the zone extraction part is the distal end) and the converging part 120, the foreign matter extraction part 100 can be smoothly rotated under the control of the operating part 500, and the phenomenon that the foreign matter extraction part 100 cannot rotate when blocked can be reduced. In specific operation, the foreign matter extraction part 100 is used in combination with an endoscope or a catheter, the relative position of the foreign matter extraction part 100 and the endoscope or the catheter is controlled, the foreign matter extraction part 100 is pulled or pushed, and the opening and tightening of the head of the foreign matter extraction part 100 are realized by extrusion through the channel wall of the endoscope or the catheter, so that the foreign matter is collected into the foreign matter extraction part 100 and removed out of the body together with the endoscope or the catheter.

[0073] More specifically, in this embodiment, when the operating part 500 rotates, because the adjusting part 200 uses a spring tube as a component element, the torsion characteristics of the spring determine that there is a difference in the number of rotations between the two ends, so when one end is constrained, the other end can still rotate to a certain extent. The foreign matter extraction part 100 passes through the inside of the adjusting part 200, and the foreign matter extraction part 100 can better synchronously transmit the rotating action of the operating part 500; because the distal end of the adjusting part 200 and the foreign matter extraction part 100 of the present application are not in contact and constrained, the rotation of the distal end of the foreign matter extraction part 100 is directly controlled by the operating part 500, and does not affect the action of the adjusting part 200, and vice versa, when the motion of the adjusting part 200 is limited, it also does not affect the rotation of the foreign matter extraction part 100. Therefore, the motion state of the adjusting part 200 does not affect the foreign matter extraction part 100, and does not affect the rotation of the foreign matter extraction part 100.

[0074] In actual use, because the channel of the parent mirror and the child mirror 700 is relatively rough, the friction between the instrument and the inner wall of the channel is large, so that the relatively soft product cannot rotate in the channel; the conventional stone extraction product is covered with an outer sheath tube, and a lubricating means is provided in the outer sheath tube, so as to facilitate the rotation of the product. The active gap provided between the distal end of the adjusting part 200 away from the operating part 500 and the converging part 120 of the present foreign matter extraction device makes the adjusting part 200 unable to rotate due to the influence of the inner wall of the channel, but does not affect the rotation of the foreign matter extraction part 100, thereby meeting the requirements of the foreign matter extraction device being soft enough and having good pushability and operability.

[0075] In some embodiments, the outer diameters of the adjusting part 200 and the operating part 500 are substantially the same.

[0076] The proximal end of the adjusting part 200 is connected to the operating part 500 as a whole, and the overall diameter is substantially the same, as shown in FIG. 12, so that the damage to the inner wall of the cavity caused by the change in diameter of the in-vivo foreign matter removal device can be avoided.

[0077] In some embodiments, the convergence section 120 is further provided with a developing section 400, which is arranged at the end of the adjusting section 200 away from the operating section 500.

[0078] The developing section 400 can be provided with a material having developing effect, such as platinum-iridium alloy, so that the developing section 400 has developing effect, so as to track the position of the foreign body removal device in the body.

[0079] In some embodiments, the developing section 400 is fixedly connected with or integrally formed with the adjusting section 200; or, the developing section 400 is obtained by providing a developing coating on the adjusting section 200.

[0080] In some embodiments, the operating section 500 is provided with a marking area 510 at the end away from the adjusting section 200.

[0081] In some embodiments, the operating section 500 can be a wire material, or can be woven by a plurality of wire materials, for example, obtained by winding and welding a plurality of wire materials on a core shaft 530 wire material, so as to guarantee the synchronism of motion transmission. The operating section 500 is provided with a marking area 510 at the end away from the adjusting section 200, which can be marked with color or mark, so as to assist the doctor to determine the internal depth, as shown in FIG. 9. The foreign body removal device of the present application can be directly controlled to move and rotate by the operating section 500 during use, without the need of additional handle.

[0082] In some embodiments, the operating section 500 is provided with a smooth end portion 520 at the end away from the adjusting section 200, so as to prevent scratching the operator during use.

[0083] In some embodiments, the developing section 400 is provided with a smooth end portion 520 at the end away from the operating section 500, so as to reduce the damage to the cavity wall.

[0084] In some embodiments, the connection between the operating section 500 and the convergence section 120 is sleeved and fixed with a connecting pipe 600, and one end of the adjusting section 200 is sleeved on the connecting pipe 600 and fixed with the connecting pipe 600.

[0085] In the present embodiment, the operating section 500 and the convergence section 120 are directly connected, and the connecting pipe 600 is sleeved at the connection between the two, which is beneficial to improve the connection strength. The connecting pipe 600 and the operating section 500, the convergence section 120 and the adjusting section 200 can be connected in any form, such as welding, riveting, cementing, etc.

[0086] Experimental Example 1:

[0087] The foreign matter removing device shown in Fig. 2 of the present application is inserted into the pancreatic and biliary duct, wherein the total length of the foreign matter removing device (the length of the foreign matter removing basket 110 and the developing section 400 is smaller, and the total length of the foreign matter removing device is about the total length of the spring tube and the operating part 500) is 2 m, the spring tube is riveted at one end with the operating part 500 through the connecting tube 600, the length L1 of the spring tube and the distance L2 from the riveting point to the end of the spring tube close to the foreign matter removing part 100 are shown in Table 1, and the lengths of L1 and L2 are shown in Fig. 9. The rotation of the foreign matter removing device is studied, and the results are shown in Table 1.

[0088] Table 1

[0089] Experimental Example 2

[0090] The difference from Experimental Example 1 is that the end of the spring tube close to the foreign matter removing part 100 is also fixed with the mandrel 530, and the rotation of the foreign matter removing device is studied, and the results are shown in Table 2.

[0091] Table 2

[0092] When the foreign matter removing device of the present application is bent, the rotating operating part 500, and the foreign matter removing part 100 can still rotate synchronously. When entering the complex cavity of the human body organs, the stone foreign matter removing device can have multiple bends, and the foreign matter removing part 100 of the present application can still work normally. If the end of the spring tube close to the foreign matter removing part 100 is fixed with the converging part 120, synchronous rotation cannot be achieved.

[0093] The adjusting part 200 of the present application is a spring tube, and the torsional characteristics of the spring tube determine that there is a difference in the number of turns at both ends, so when one end is constrained, the other end can still rotate to a certain extent. The sleeve passes through the converging part 120 inside, and the converging part 120 can better synchronously transmit rotation, and the distal end of the adjusting part 200 of the present application and the converging part 120 are not in contact with the constraint, and the rotation of the converging part 120 is directly controlled by the operating part 500, and is not related to the rotation of the adjusting part 200. However, if both ends of the adjusting part 200 are fixed with the mandrel 530, the synchronous rotation of the mandrel 530 will constrain the synchronous rotation of the sleeve, and in this case, if the rotation of the adjusting part 200 is hindered, the movement of the converging part 120 will be hindered. The adjusting part 200 of the present application is fixed with the operating part 500, and the other end is not fixed with the converging part 120 but is only sleeved on the converging part 120, so the movement state of the adjusting part 200 does not affect the converging part 120, and further does not affect the rotation of the foreign matter removing part 100.

[0094] In the curved state, the object passing through the cavity will squeeze the cavity to generate friction force. The harder the object is, the greater the squeezing force is, and the greater the friction resistance is. The convergence part 120 of the foreign matter extraction part 100 of the present application is different from the hard wire rope. It is more flexible and slender, and the pressure on the pipe wall when bending is small, the resistance is also small, and the motion transmission is more smooth. When the adjusting part 200 is fixed at both ends of the convergence part 120, the rotation of the convergence part 120 mainly depends on the rotation of the adjusting part 200. The hardness of the spring tube is much higher than that of the woven wire, which will increase the friction of the adjusting part 200 on the cavity wall, and the adjusting part 200 cannot rotate, so that the internal convergence part 120 cannot move independently.

[0095] In the straight state, the convergence part 120 is suspended relative to the adjusting part 200, and the end of the convergence part 120 close to the foreign matter extraction part 100 is not connected and constrained with the adjusting part 200, and is in an equivalent state of no resistance. Therefore, the rotation of the foreign matter extraction part 100 is independent of the movement state of the adjusting part 200. When the adjusting part 200 is fixed at both ends of the convergence part 120, the movement of the adjusting part 200 is closely related to the convergence part 120. Once the adjusting part 200 cannot rotate, the convergence part 120 is difficult to rotate.

[0096] The main function of the outer sheath tube is to establish a working channel so that the working part and the working channel can cooperate with each other to realize the product function. The working channel of the sub-scope 700 and the working channel established by the outer sheath tube have the same effect. The structure protected by the present application can be without an outer sheath tube, only with a reinforcing part of a tubular part with a groove structure. After the outer sheath tube is removed, the channel of the sub-scope 700 can also achieve the same purpose, but at the same time, the present application needs to be used in cooperation with an endoscope. After the disposable sheath tube is discarded, the product has more space to strengthen the strength of the photo itself, so that the product has better push performance. The sheathless basket and the sub-scope 700 basket are both working under the pancreatic and biliary tract imaging catheter (referred to as: sub-scope 700). They both need to reach the designated position for operation and stone removal by means of the working channel of the sub-scope 700. The main difference between the two is that the sheathless basket in the present application uses the channel of the sub-scope 700 as its own sheath channel, and uses the channel of the sub-scope 700 to realize the opening and closing and rotation operation of the basket. The existing sub-scope 700 basket has its own sheath tube and can independently complete the opening and closing operation.

[0097] The sheath tube of the basket is equivalent to one that is assembled outside the body and one that is assembled during the operation. Repeated pushing or even the inability to push the basket during the operation can cause serious consequences, so there is a higher demand for the success rate of basket pushing. The sheathless basket in the application can be opened and closed and rotated by means of the sub-mirror 700. The channel of the sub-mirror 700 can be understood as the outer sheath of the sheathless basket, and the sub-mirror 700 has its own handle, which can be understood as the outer sheath tube being fixed. In this way, we can operate the basket outer sheath tube at will without losing the position, and the success rate of basket pushing is higher. However, the conventional basket itself has a sheath tube, and the handle is used to constrain the interaction between the working part and the outer sheath tube. If the handle is lost at this time, the outer sheath tube will lose its constraint and become uncontrollable, thereby making it impossible to operate, and thus reducing the success rate of basket pushing.

[0098] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A foreign object extraction device, characterized by, The foreign matter removing part, the adjusting part and the operating part are included; One end of the foreign matter removing part is formed into a converging part by at least two wires arranged in longitudinal staggered manner; The adjusting part is configured to adjust the softness at the converging part, and is annularly arranged outside the converging part, one end of the adjusting part is fixedly connected with the operating part, and the adjusting part includes an inner channel extending in longitudinal direction; An active gap is arranged between the end of the adjusting part away from the operating part and the converging part, and the active gap is configured to allow the end of the adjusting part away from the operating part to change the relative position and rotate with the foreign matter removing part; The position relationship among the one end of the foreign matter removing part, the one end of the adjusting part and the operating part is relatively fixed.

2. The foreign object extraction device of claim 1, wherein, The adjusting part is in tubular shape, and a groove is arranged on the adjusting part in circumferential direction to facilitate the bending of the adjusting part.

3. The foreign object extraction device of claim 2, wherein, The adjusting part is a spring tube.

4. The foreign object extraction device of claim 1, wherein, The outer diameters of the adjusting part and the operating part are substantially the same.

5. The foreign object extraction device of claim 1, wherein, The converging part is formed by weaving a plurality of wires.

6. The foreign object extraction device of claim 1, wherein, An imaging section is further arranged on the adjusting part, and the imaging section is arranged at the end of the adjusting part away from the operating part.

7. The foreign object extraction device of claim 6, wherein, The imaging section is fixedly connected with the adjusting part or integrally formed with the adjusting part, or the imaging section is obtained by arranging an imaging coating on the adjusting part.

8. The foreign object extraction device of claim 6, wherein, A smooth end is arranged at the end of the imaging section away from the operating part.

9. The foreign object extraction device of claim 1, wherein, A mark area is arranged at the end of the operating part away from the adjusting part.

10. The foreign object extraction device of claim 1, wherein, A smooth end is arranged at the end of the operating part away from the adjusting part.

11. The foreign object extraction device of claim 1, wherein, A connecting tube is sleeved and fixed at the connection between the operating part and the converging part, and one end of the adjusting part is sleeved on the connecting tube and fixed with the connecting tube.

12. The foreign object extraction device of claim 1, wherein, The rigidity of the adjusting part is smaller than that of the operating part.

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