Foreign object removal device

Abstract

An embodiment of the present invention provides a foreign body removal device, which relates to the field of medical devices and includes a foreign body removal part, an adjustment part and an operation part. One end of the foreign body removal part is woven and bundled to form a bundling part. The operation part is fixedly connected to the end of the bundling part. The adjustment part is arranged around the outside of the bundling part, and one end of the adjustment part is fixedly connected to the operation part. The overall diameter of the foreign body removal device in this application is extremely thin. Compared with traditional stone extraction basket products, the overall diameter is reduced by more than 50%, and it can be directly inserted into smaller channels. It can easily reach positions such as the biliary tract and intestine, and at the same time, it can ensure the effective rotation of the foreign body removal part under various bends, greatly expanding the application range of the treatment of foreign bodies for stone extraction.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a foreign body removal device. Background Art

[0002] Most of the existing foreign body removal devices are stone removal baskets or net bags or foreign body forceps, etc. In operations such as sub-mirror lithotripsy, the diameter of the instrument channel of the sub-mirror is relatively small. When used with a traditional foreign body removal device, due to the larger diameter of the sheath, it is often necessary to withdraw other instruments and then reintroduce the foreign body removal device. This affects the accuracy of the second entry position of the foreign body removal device, and on the other hand, in situations where multiple instruments need to be operated in coordination, the larger diameter of the foreign body removal device will occupy the operating space of other instruments, resulting in the inability to work in coordination with other instruments.

[0003] Especially when it is used to remove foreign bodies in the pancreaticobiliary tract, since the pancreaticobiliary tract is narrow and has many small branches, the foreign body removal device needs to be long and have good bending performance when entering through the duodenal papilla. However, the current net basket can only achieve the effect of easy bending, poor pushing performance, or good pushing performance but not easy to bend; since the diameter and performance of the net basket cannot meet the requirements, the current foreign body removal device cannot achieve long-distance operation under a thin diameter.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The purpose of the present invention includes, for example, providing a foreign body removal device, which has the characteristics of small diameter, long length, easy bending, and good pushing performance, which is conducive to operation in a small cavity with a longer span.

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

[0007] In a first aspect, the present invention provides a foreign body removal device, comprising a foreign body removal unit, an adjustment unit and an operation unit;

[0008] One end of the foreign body removal part is formed by at least two wires staggered in the longitudinal direction to form a gathering part, and the operating part is fixedly connected to the end of the gathering part;

[0009] The adjusting part is configured to adjust the softness of the contraction part, the adjusting part is disposed around the outside of the contraction part, one end of the adjusting part is fixedly connected to the operating part, and the adjusting part includes an inner channel extending longitudinally through the inner channel;

[0010] A movable gap is provided between the end of the adjusting portion away from the operating portion and the constricting portion, and the movable gap is configured to enable the end of the adjusting portion away from the operating portion and the foreign matter removing portion to change relative position and rotate relative to each other;

[0011] One end of the foreign object removal part, one end of the adjustment part, and the operation part have relatively fixed positional relationships.

[0012] In an alternative embodiment, the adjustment part is tubular, and a groove for facilitating the bending of the adjustment part is circumferentially provided on the adjustment part.

[0013] In an alternative embodiment, the adjustment part is a spring tube.

[0014] In an alternative embodiment, the outer diameters of the adjustment part and the operation part are substantially the same.

[0015] In an alternative embodiment, the constriction part is formed by braiding a plurality of wire materials.

[0016] In an alternative embodiment, a developing section is further provided on the adjustment part, and the developing section is provided at one end of the adjustment part away from the operation part.

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

[0018] In an alternative embodiment, a rounded end portion is provided at one end of the developing section away from the operation part.

[0019] In an alternative embodiment, a marking area is provided at one end of the operation part away from the adjustment part.

[0020] In an alternative embodiment, a rounded end portion is provided at one end of the operation part away from the adjustment part.

[0021] In an alternative embodiment, a connecting pipe is sleeved and fixed at the connection between the operation part and the constriction part, and one end of the adjustment part is sleeved on the connecting pipe and fixed to the connecting pipe.

[0022] In an alternative embodiment, the rigidity of the adjustment part is less than that of the operation part.

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

[0024] The overall diameter of the foreign object removal device in the present application is extremely thin, and there is no need to provide an outer sheath tube required for traditional wire baskets. Compared with traditional stone retrieval wire basket products, the overall diameter is reduced by more than 50%, and it can be directly inserted into smaller channels. At the same time, the adjustment part of the present invention improves the axial stiffness and radial support of the front end of the foreign object removal part, has better pushability and support than a wire basket woven from a single nitinol wire, can easily reach positions such as the biliary tract and intestine, and can ensure the effective rotation of the foreign object removal part under various bends, greatly expanding the application range of foreign object removal treatment. Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 Structural schematic diagram of the foreign object extraction device in an embodiment of the present invention;

[0027] Figure 2 Structural schematic diagram of the foreign object extraction device in another embodiment of the present invention;

[0028] Figure 3 Structural schematic diagram of the first type of retrieval basket;

[0029] Figure 4 Structural schematic diagram of the second type of retrieval basket;

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

[0031] Figure 6 Structural schematic diagram of the first type of constriction part;

[0032] Figure 7 Structural schematic diagram of the second type of constriction part;

[0033] Figure 8 Structural schematic diagram of an operation part;

[0034] Figure 9 For Figure 2 Partial structural schematic diagram;

[0035] Figure 10 Schematic diagram of the cooperation between the foreign object extraction device and the sub - mirror;

[0036] Figure 11 For Figure 10 Enlarged view of part A;

[0037] Figure 12 Structural schematic diagram of the connection position between the adjustment part and the operation part.

[0038] Icons: 100 - foreign object extraction part; 110 - retrieval basket; 120 - constriction part; 200 - adjustment part; 400 - developing section; 500 - operation part; 510 - marking area; 520 - rounded end; 530 - mandrel; 600 - connecting tube; 700 - sub - mirror. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0040] 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 present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

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

[0042] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. 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 present invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] In addition, terms such as "first" and "second" are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

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

[0045] Please refer to Figure 1 and Figure 2 , this embodiment provides a foreign object removal device, including a foreign object removal part 100, an adjustment part 200, and an operation part 500;

[0046] One end of the foreign object removal part 100 is formed with a converging part 120 by at least two wire materials arranged longitudinally in a staggered manner, and the operation part 500 is fixedly coupled to the end of the converging part 120;

[0047] The adjustment part 200 is configured to adjust the softness at the converging part 120. The adjustment part 200 is disposed around the outside of the converging part 120. One end of the adjustment part 200 is fixedly connected to the operation part 500. The adjustment part 200 includes an inner channel extending longitudinally therethrough;

[0048] An active gap is provided between the end of the adjusting portion 200 away from the operating portion 500 and the converging portion 120, and the active gap is configured to enable the end of the adjusting portion 200 away from the operating portion 500 and the foreign matter removing portion 100 to change their relative position and rotate relative to each other;

[0049] The positional relationship among one end of the foreign matter removal portion 100 , one end of the adjustment portion 200 , and the operation portion 500 is relatively fixed.

[0050] In some embodiments, the constricting portion 120 is formed by weaving a plurality of wires.

[0051] In some embodiments, the foreign body removal portion 100 includes a removal basket 110 formed by winding two or more wires, and the ends of the two or more wires are woven together to form a gathering portion 120 .

[0052] The material of the object retrieval basket 110 in the present application can be memory alloy to prevent the retrieval basket 110 from being loose. The retrieval basket 110 is directly folded by weaving wire, and compared with the traditional form, it does not need to be riveted or other auxiliary folding. After folding, it continues to extend and weave to form a gathering part 120, which increases the softness of the foreign body retrieval part 100 and facilitates the bending and entry of more complex bends.

[0053] Reference Figures 3 - 5 As one of the weaving methods, one of the wires of the foreign body retrieval part 100 includes two parts: a retrieval basket 110 at the head end and a constriction part 120 at the tail end. The retrieval basket 110 is elliptical, spiral or triangular in shape as a whole, and the ends of two or more branch wires at the tail end are woven together to form the constriction part 120. Figure 6 and Figure 7 As one weaving method, the structure of the constricting portion 120 can be set as the first branch and the second branch extending in a spiral shape as a whole, and the first branch and the second branch are intertwined with each other. As another weaving method, the structure of the constricting portion 120 can be set as the first branch extending in a straight line as a whole, the second branch extending in a spiral shape as a whole, and the second branch is wound around the outer surface of the first branch.

[0054] In some embodiments, the length of the basket 110 along the axial direction of the convergence portion 120 is greater than the length along the radial direction of the convergence portion 120, which is conducive to causing the foreign body retrieval portion 100 to be preferentially folded along the axial direction when being squeezed. In some embodiments, the length of the convergence portion 120 is greater than 20% of the total length of the foreign body retrieval portion 100, which is conducive to ensuring the softness of the foreign body retrieval portion 100 and facilitating the entry of more complex bends.

[0055] In this 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 converging part 120 of the foreign object extraction part 100 is directly connected to the operation part 500.

[0056] Specifically, referring to Figure 8 , as an implementation manner, 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 to the mandrel 530 part. The ways of fixed connection include but are not limited to welding, bonding or other ways that can achieve relative fixation between the two. One end of the winding cable part close to the converging part 120 continues to extend after completely covering the mandrel 530 part. The extended part is disposed around the outside of the converging part 120 and is fixedly connected to the converging part 120 and the extended part. Similarly, the ways of fixed connection include but are not limited to welding, bonding or other ways that can achieve relative fixation between the two.

[0057] As another implementation manner, the converging part 120 and the operation part 500 as a whole can also adopt ways such as welding, bonding or other ways that can achieve relative fixation between the two.

[0058] The adjusting part 200 is disposed around the outside of the converging part 120. The adjusting part 200 can move forward and backward together with the foreign object extraction part 100 under the control of the operation part 500; when the operation part 500 is rotated, the foreign object extraction part 100 rotates along with it. The adjusting part 200 can enhance the radial support ability of the converging part 120 and at the same time enhance the pushing property to improve the ability of the foreign object extraction part 100 to pass through complex channels. It should be noted that if the materials of each part of the foreign object extraction device in this application are not specifically stated, conventional materials in medical devices can be selected, such as nitinol, memory alloy, etc.

[0059] The overall strength and rigidity of the existing sheath network basket are consistent. The difference between the present invention and the existing sheath network basket is that the adjusting part 200 and the converging part 120 are combined to form the front part of the foreign object extraction device, and the operation part 500 is the rear part of the foreign object extraction device; the rigidity of the adjusting 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, being convenient for passing through small bends and having a certain supporting force, and the rear part has the characteristics of strong rigidity, good supporting force, certain elasticity and good pushing property.

[0060] Furthermore, in the actual use process, as one of the instruments required for surgical work, the foreign body removal device will be applied to surgeries related to the pancreaticobiliary tract. Currently, the existing sheath stone extraction basket cannot be directly applied to the subscope 700 during the surgery due to its relatively large diameter. It is necessary to first remove the subscope 700 and then insert it into a larger channel. The foreign body removal device of the present invention can be directly inserted into the subscope 700 of the pancreaticobiliary tract imaging catheter, as shown in Figure 10 and Figure 11 . Due to the characteristics of the pancreaticobiliary tract being relatively narrow and having many fine branches, there will be a situation where small bends need to be passed through within the pancreaticobiliary tract imaging catheter. The front part of the foreign body removal device is used to pass through small bends and play a guiding role, and the rear part of the foreign body removal device is used to maintain the overall pushing performance and support performance.

[0061] When the front part of the foreign body removal device is too long, since the front part is relatively soft, it will affect the overall pushing performance of the foreign body removal device, resulting in a decrease in the push-pull opening and closing performance and rotation performance of the foreign body removal device. After the front part exceeds a certain range, at this time, as the length of the soft section increases, the pushing resistance gradually increases, and the rotation shows a delay or delayed response, leading to a decrease in the overall performance of the foreign body removal device. To meet the actual use situation, through actual tests, the length of the front part of the foreign body removal device is preferably 200 - 500 mm. Within this length range, the overall pushing performance of the foreign body removal device will not be affected, enabling the foreign body removal device to meet the requirements of rigidity and pushing performance while also meeting the bending degree requirements of the corresponding position.

[0062] Currently, the commonly used technology is the sheath basket, which has a relatively large diameter and cannot meet the requirement of a fine diameter. However, after removing the sheath of the sheath basket, the product is easily bendable and has poor pushing performance when directly applied, resulting in the inability to obtain a sheathless basket product in this way. If the overall strength of the basket is enhanced due to being too soft, the problem of inability to pass through bends will occur. Based on the sheathless fine diameter, the present application achieves the effect of enhancing the pushing performance without increasing the diameter by changing the structure. The overall diameter of the foreign body removal device in the present application can be extremely fine, as low as 0.8 - 1 mm, which is more than 50% smaller than the overall diameter of traditional stone extraction basket products, and can be directly inserted into smaller cavities.

[0063] Compared with the existing basket part with a sheath network basket, the structure of the present invention in which the constriction part 120 and the adjustment part 200 cooperate 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 under various bends, and expands the application range of the treatment of removing foreign bodies in stones. It solves the problem that the basket part of the existing basket with a sheath cannot be accurately operated in the endoscopic channel without the sheath. At the same time, the structure of the adjustment 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 positions such as the biliary tract and the intestine.

[0064] The structure of the constriction part 120 of the foreign body removal part 100 of the present invention, which is different from the form in which the traditional basket head relies on riveting to close, the constriction part 120 directly closes and lengthens by weaving, which has the effect of controlling the diameter size and increasing the softness at the distal end. The design of the constriction part 120 makes the foreign body removal part 100 as a whole more slender, effectively reducing the friction with the cavity wall; achieving greater softness and being more easily bent to smoothly enter the complex cavity.

[0065] The segmented splicing form of the present invention and the synchronous cooperation with the operation part 500 increase the flexibility and action transmission of the foreign body removal device, and can be smoothly bent and enter the complex cavity.

[0066] The foreign body removal device in this application is applied to the pancreaticobiliary imaging catheter. There are two extreme bends during the use of the catheter: ① at the entrance of the duodenum into the papilla (about 90°); ② retrograde endoscopy operation in the pancreatic and bile ducts (about 180°). The foreign body removal device in this application is designed in two sections, the front end has good elasticity and softness and is suitable for bending, playing a guiding role, and the end is harder and has better supporting force for pushing.

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

[0068] In some embodiments, the adjustment part 200 is tubular, and a groove for facilitating the bending of the adjustment part is provided on the adjustment part 200 along the circumferential direction; preferably, the adjustment part 200 is a spring tube.

[0069] The adjustment part 200 can be bent in any radial direction and is not easily compressed axially to ensure the supporting ability for the constriction part 120 and strengthen the pushing ability of the foreign body removal part 100.

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

[0071] In some embodiments, there is an active gap between one end of the adjusting part 200 away from the operating part 500 and the bundling part 120.

[0072] When the adjusting part 200 is blocked and cannot rotate, since there is an active gap 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 extraction part in area one is the distal end) and the bundling part 120, it is beneficial for the foreign body extraction part 100 to rotate smoothly under the control of the operating part 500, and can reduce the phenomenon that the foreign body extraction part 100 cannot rotate when being blocked. During specific operation, the foreign body extraction part 100 is used in combination with an endoscope or a catheter. By controlling the relative position of the foreign body extraction part 100 and the endoscope or the catheter, pulling or pushing the foreign body extraction part 100, and squeezing through the inner wall of the endoscope or catheter channel, the head of the foreign body extraction part 100 is opened and tightened, so as to collect the foreign body into the foreign body extraction part 100 and remove it from the body together with the endoscope or the catheter.

[0073] More specifically, in this embodiment, when the operating part 500 rotates, since the adjusting part 200 uses a spring tube as a component element, the torsional characteristics of the spring determine that there is a difference in the number of revolutions at both ends. Therefore, when one end is restricted, the other end can still rotate to a certain extent. The foreign body extraction part 100 passes through the adjusting part 200, and the foreign body extraction part 100 can preferably synchronously transmit the rotation action of the operating part 500; since there is no contact constraint between the distal end of the adjusting part 200 of the present invention and the foreign body extraction part 100, the rotation of the distal end of the foreign body extraction part 100 is directly controlled by the operating part 500 and does not affect the action of the adjusting part 200. On the contrary, when the movement of the adjusting part 200 is limited, it does not affect the rotation of the foreign body extraction part 100 either. Therefore, the movement state of the adjusting part 200 does not affect the foreign body extraction part 100 or its rotation.

[0074] During the actual use process, since the channels of the mother endoscope and the son endoscope 700 are relatively rough, the friction between the instrument and the inner wall of the channel is large, making it impossible for a softer product to rotate in the channel; the conventional stone extraction product is coated with an outer sheath tube, and a lubricating means is provided inside the outer sheath tube to facilitate the rotation of the product. The active gap provided between one end of the adjusting part 200 of the present foreign body extraction device away from the operating part 500 and the bundling part 120 enables the adjusting part 200 not to rotate although affected by the inner wall of the channel, but does not affect the rotation of the foreign body extraction part 100, thus meeting the requirements that the foreign body extraction device is soft enough and has 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 integrally connected to the operating part 500, and the overall diameter is substantially the same. As Figure 12 shown, it can prevent the inner wall of the cavity from being damaged due to the change in diameter of the device for removing foreign objects in the body.

[0077] In some embodiments, a developing section 400 is further provided on the converging part 120, and the developing section 400 is provided at one end of the adjusting part 200 away from the operating part 500.

[0078] The developing section 400 can be made of a material with a developing function such as platinum-iridium alloy, so that the developing section 400 has a developing function to facilitate tracking the position of the device for removing foreign objects in the body.

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

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

[0081] In some embodiments, the operating part 500 can be a single wire or can be woven from multiple wires. For example, it is obtained by winding and welding multiple wires on a mandrel 530, which can ensure the synchronism of motion transmission. A marking area 510 is provided at one end of the operating part 500 away from the adjusting part 200, which can be marked with colors or marks to assist the doctor in determining the internal penetration length. As Figure 9 shown. When the device for removing foreign objects in this application is used, the movement and rotation of the device for removing foreign objects can be directly controlled through the operating part 500 without additional configuration of a handle.

[0082] In some embodiments, a rounded end 520 is provided at one end of the operating part 500 away from the adjusting part 200 to prevent scratching the operator during use.

[0083] In some embodiments, a rounded end 520 is provided at one end of the developing section 400 away from the operating part 500 to reduce damage to the cavity wall.

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

[0085] In this embodiment, the operation part 500 and the converging part 120 are directly connected, and the connecting pipe 600 is sleeved at the connection part between the two, which is beneficial to improving the connection strength. Among them, any form capable of realizing connection, such as welding, riveting, cementing, etc., can be adopted between the connecting pipe 600 and the operation part 500, the converging part 120, and the adjusting part 200.

[0086] Experimental Example 1:

[0087] Insert the foreign object removal device shown in this application Figure 2 into the pancreaticobiliary tract. The total length of the foreign object removal device (the lengths of the object retrieval basket 110 and the imaging section 400 are relatively small, and the total length of the foreign object removal device is approximately the total length of the spring tube and the operation part 500) is 2 m. One end of the spring tube is riveted to the operation part 500 through the connecting pipe 600. The length L1 of the spring tube and the distance L2 from the riveting point to the spring tube near the foreign object removal part 100 are shown in Table 1. The lengths of L1 and L2 are as Figure 9 shown, and the rotation situation of the foreign object removal device is studied. The results are shown in Table 1.

[0088] Table 1

[0089]

[0090] Experimental Example 2:

[0091] The difference from Experimental Example 1 is only that one end of the spring tube near the foreign object removal part 100 is also fixed to the mandrel 530, and the rotation situation of the foreign object removal device is studied. The results are shown in Table 2.

[0092] Table 2

[0093]

[0094] When the foreign object removal device of this application is bent, rotate the operation part 500, and the foreign object removal part 100 can still rotate synchronously. When entering the complex cavities of human organs, there are multiple bends in the stone-removing foreign object device. The foreign object removal part 100 of the present invention can still rotate and work normally. If one end of the spring tube near the foreign object removal part 100 is fixed to the converging part 120, synchronous rotation cannot be achieved.

[0095] The adjusting part 200 of the present invention is a bourdon tube. The torsional characteristics of the bourdon tube determine that there is a difference in the number of revolutions at both ends. Therefore, when one end is constrained, the other end can still rotate to a certain extent. The converging part 120 passes through the inside of the sleeve. The converging part 120 can synchronously transmit rotation well. The distal end of the adjusting part 200 of the present invention is in non-contact constraint with the converging part 120. The rotation of the converging part 120 is directly controlled by the operating part 500 and has nothing to do with the rotation of the adjusting part 200. However, if both ends of the adjusting part 200 are fixed to the mandrel 530, then the synchronous rotation of the mandrel 530 will constrain the synchronous rotation of the sleeve. In this case, if the rotation of the adjusting part 200 is blocked, the movement of the converging part 120 will be blocked. The adjusting part 200 of the present invention is fixed to the operating part 500, and the other end is not fixed to the converging part 120 but only sleeved on the converging part 120. Therefore, the movement state of the adjusting part 200 does not affect the converging part 120, and thus does not affect the rotation of the foreign object extraction part 100.

[0096] In the bent state, the object passing through the inside of the channel will squeeze the channel to generate frictional force. The harder the object, the greater the squeezing force and the greater the frictional resistance. The converging part 120 of the foreign object extraction part 100 of the present invention is different from a rigid wire rope. It is softer and thinner, exerts less pressure on the tube wall when bent, has less resistance, and the movement transmission is smoother. When both ends of the adjusting part 200 and the converging part 120 are fixed, the rotation of the converging part 120 is mainly achieved by the rotation of the adjusting part 200. The hardness of the bourdon tube is much higher than that of the braided wire material, which will increase the friction between the adjusting part 200 and the channel wall, and the adjusting part 200 cannot rotate, resulting in the inability of the internal converging part 120 to move independently.

[0097] In the straight state, a part of the converging part 120 is suspended relative to the adjusting part 200. The end of the converging part 120 close to the foreign object extraction part 100 has no connection constraint with the adjusting part 200, which is equivalent to a state without resistance. Therefore, the rotation of the foreign object extraction part 100 has nothing to do with the movement state of the adjusting part 200. When both ends of the adjusting part 200 and the converging part 120 are fixed, the movement of the adjusting part 200 is closely related to the converging part 120. Once the adjusting part 200 cannot rotate, it is difficult for the converging part 120 to rotate.

[0098] The main function of the outer sheath 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, and the working channel of the sub-mirror 700 has the same function as the working channel established by the outer sheath. The structure protected by this application can be provided without an outer sheath, and only with a reinforcing part of a tubular part with a groove structure. After the outer sheath is removed, the sub-mirror 700 channel can also achieve the same purpose, but at the same time, this application needs to be used in conjunction with an endoscope, etc. After the sheath is discarded, the product has more space to strengthen the strength of the photo itself, so that the product has better pushing performance. Both the sheathless basket and the sub-mirror 700 basket work under the pancreaticobiliary imaging catheter (referred to as: sub-mirror 700), and they both need to reach the designated position with the help of the working channel of the sub-mirror 700 to operate the stone removal and foreign body removal. The main difference between the two is that the sheathless basket in this application uses the sub-mirror 700 channel as its own sheath channel, and uses the sub-mirror 700 channel to realize the opening and closing and rotation operations of the basket, while the existing sub-mirror 700 basket has its own sheath and can independently complete the opening and closing operations.

[0099] The basket with an outer sheath and the basket without a sheath are equivalent to assembling an outer sheath in vitro and assembling an outer sheath during surgery. Repeatedly pushing or even failing to push the basket during surgery will cause serious consequences, so there is a higher demand for the success rate of basket pushing. The basket without a sheath in this application is opened and closed and rotated with the help of a sub-mirror 700. The sub-mirror 700 channel can be understood as the outer sheath of the basket without a sheath, and the sub-mirror 700 has its own handle, which can be understood as the outer sheath has been fixed, so that we can operate the basket outer sheath arbitrarily and it will not be out of position, and the success rate of basket pushing is higher. However, the conventional basket itself has a sheath, and the handle is to constrain the interactive operation between the working part and the outer sheath. If the support of the handle is lost at this time, the outer sheath will lose the constraint and become uncontrollable and then unable to operate, thereby reducing the success rate of basket pushing.

[0100] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A foreign body removal device, characterized in that, It includes a foreign object extraction part, an adjustment part and an operation part; One end of the foreign object extraction part forms a converging part by at least two wire materials arranged longitudinally in a staggered manner, and the operation part is fixedly connected to the end of the converging part; The adjustment part is configured to adjust the softness at the converging part. The adjustment part is looped outside the converging part. One end of the adjustment part is fixedly connected to the operation part, and the adjustment part includes an inner channel extending longitudinally through it; There is an activity gap between the end of the adjustment part away from the operation part and the converging part. The activity gap is configured to enable a relative position change and relative rotation between the end of the adjustment part away from the operation part and the foreign object extraction part; The positional relationship among one end of the foreign object extraction part, one end of the adjustment part, and the operation part is relatively fixed; The adjustment part is tubular, and there are grooves arranged circumferentially on the adjustment part to facilitate the bending of the adjustment part; the adjustment part is a spring tube.

2. The foreign body removal device according to claim 1, wherein The outer diameters of the adjustment part and the operation part are substantially the same.

3. The foreign object removal device according to claim 1, characterized in that The converging part is formed by braiding a number of wire materials.

4. The foreign object removal device according to claim 1, characterized in that, A developing section is also provided on the adjustment part, and the developing section is arranged at the end of the adjustment part away from the operation part.

5. The foreign object removal device according to claim 4, wherein, The developing section is fixedly connected or integrally formed with the adjustment part; or, the developing section is obtained by setting a developing coating on the adjustment part.

6. The foreign object removal device according to claim 4, characterized in that, The end of the developing section away from the operation part is provided with a smooth end.

7. The foreign body removal device according to claim 1, characterized in that, A marking area is provided at the end of the operation part away from the adjustment part.

8. The foreign object removal device according to claim 1, wherein, The end of the operation part away from the adjustment part is provided with a smooth end.

9. The foreign body removal device according to claim 1, characterized in that, A connecting pipe is sleeved and fixed at the connection between the operation part and the converging part, and one end of the adjustment part is sleeved on the connecting pipe and fixed to the connecting pipe.

10. The foreign body removal device according to claim 1, characterized in that, The rigidity of the adjustment part is less than that of the operation part.

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