An auxiliary cutting device and a stone extraction basket and snare using the same

Abstract

The application relates to the technical field of medical devices, in particular to an auxiliary cutting device and a stone extraction basket and a snare applying the same. The auxiliary cutting device is applied to a surgical device with a material extraction part and a sheath tube. The auxiliary cutting device comprises an end cap, a cutting main body arranged at the distal end side of the end cap, and a cap body arranged at the proximal end side of the end cap. The cap body is open towards a direction away from the cutting main body and is used for matched cover connection and fixing with a distal end head part of the sheath tube of the surgical device. The cutting main body comprises a sharp part and at least one blade part located in the circumferential direction of the sharp part and connected with the sharp part. The sharp end of the sharp part and the blade edge of the blade part are arranged towards a direction away from the cap body. The technical problem that the existing stones with large volume and hard texture and foreign matters with hard texture are difficult to be effectively broken and cut is solved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an auxiliary cutting device and a stone retrieval basket and snare using the same. Background Technology

[0002] In endoscopic surgery for stones in the digestive and urinary systems, stone retrieval baskets are commonly used instruments. However, they are ineffective at breaking up large and hard stones. These stones have abnormal calcium content, resulting in a hard stone structure. Furthermore, in the biliary system, stones formed over a long period due to the excessive precipitation of cholesterol, bile pigments, and calcium salts from bile components also possess strong resistance to fragmentation. Similarly, foreign objects such as fish bones and bones that need to be broken up during gastrointestinal surgeries are also quite hard and difficult to break.

[0003] When using conventional stone retrieval baskets, these types of stones cannot be effectively broken down into smaller pieces. When these foreign objects are caught in the basket and pass through physiologically narrow areas of the body, they are prone to becoming lodged between the digestive tract wall and the basket. Once lodged, it not only hinders the stone removal process but may also cause direct pressure and damage to the patient's digestive tract wall, leading to serious consequences such as ureteral spasm, mucosal edema, or even ischemia. Similarly, in the biliary system, the anatomical structure of the bile duct also has narrow areas, such as the junction of the common hepatic duct and the cystic duct. If these stones become lodged in these areas, it can also cause bile duct obstruction, leading to a series of complications such as cholangitis. Furthermore, the use of instruments such as snares and forceps to remove these types of stones in the gastrointestinal tract or esophagus may also cause scratches to human tissue. Therefore, the fragmentation of these stones and foreign objects is particularly important.

[0004] When these types of stones or foreign objects become impacted during removal, or simply because the stones are large or heavy, the friction between the stones or foreign objects and the surrounding tissues is significant. Furthermore, the material and design of the stone retrieval basket itself can deform or tighten under heavy tension, increasing the resistance to pulling. This means that doctors need to expend considerable force when attempting to remove these stones or foreign objects using the stone retrieval basket. Some stone retrieval baskets use handles to increase the force applied to the stone, thus using elastic threads to cut it. However, this method relies on the elastic threads of the stone retrieval basket to cut the stone. This not only easily damages the elastic threads but may also result in the elastic threads being broken without the stone being cut. Moreover, doctors still need to apply considerable force when using this method.

[0005] Another method involves breaking the handle to insert a lithotripsy device for lithotripsy. However, this method requires a significant amount of time during the procedure to reinsert the laser fiber. This method has the problem that the laser may not be aligned with the stone in the retrieval basket, which can lead to poor lithotripsy results and may also cause the laser to hit the bile duct wall and damage the bile duct.

[0006] The snare device is also commonly used in digestive system surgery. The existing method is to cut the tissue by squeezing the snare and sheath at the front end. However, the cutting efficiency and effect are poor, and irregular incisions and tears are easily formed during the cutting process, which increases the risk of postoperative infection. Utility Model Content

[0007] The purpose of this application is to provide an auxiliary cutting device and a stone-retrieving basket and snare using the same, in order to solve the technical problem that it is difficult to effectively break and cut large and hard stones and hard foreign objects.

[0008] In a first aspect, this application provides an auxiliary cutting device for use in a surgical instrument with a retrieval part and a sheath. The auxiliary cutting device includes: an end cap, a cutting body is provided on the distal side of the end cap, and a cap body is provided on the proximal side of the end cap. The cap body opens in a direction away from the cutting body and is used to match, cover, connect and fix with the distal head of the sheath of the surgical instrument.

[0009] The cutting body includes a sharp part and at least one blade part located circumferentially on the sharp part and in transition with the sharp part, wherein the sharp end of the sharp part and the cutting edge of the blade part are arranged in a direction away from the cap body.

[0010] Furthermore, the end cap also includes at least one through hole located circumferentially on the pointed portion and spaced apart from the blade portion, the first through hole being for the elastic thread of the retrieval portion of the surgical instrument to pass through.

[0011] Furthermore, the pointed portion protrudes higher than each of the blade portions.

[0012] Furthermore, the end cap is provided with a plurality of blade portions and a plurality of first through holes at even intervals;

[0013] A first through hole is provided between each two adjacent blade portions, and a plurality of first through holes and a plurality of blade portions are arranged alternately and at intervals along the circumferential direction;

[0014] Furthermore, the multiple first through holes are arranged to pass through the multiple elastic threads of the picking part of the surgical instrument in a one-to-one correspondence.

[0015] Furthermore, the pointed portion is located at the center of the distal end of the end cap;

[0016] Each of the blade portions extends in a direction that spreads outward from the sharp point, and the cutting edges of each blade portion intersect and converge at the sharp point.

[0017] Furthermore, the interval angle between the cutting edges of each of the said blade portions is the same; and / or

[0018] The cross-section of the middle part of the cutting edge of each of the blade portions is a single sharp bevel or a symmetrical double sharp bevel.

[0019] Furthermore, the sharp end face of the cutting edge of each of the aforementioned blade portions is straight, arched, or arc-shaped; and / or

[0020] The shape of each of the pointed parts is conical or triangular.

[0021] Furthermore, a limiting portion is provided on the outer periphery of the distal side of the end cap, and the limiting portion is located on the periphery of the cutting body. The limiting portion includes at least one protrusion, which covers and is connected to the outer side wall of the blade portion. The top of the protrusion is higher than the blade portion and the sharp portion, and the outer edge of the protrusion is rounded.

[0022] Furthermore, the limiting part also includes at least one recess, each of which is provided with a first through hole. The sidewall of the recess that is in contact with the bottom of the cutting edge of the blade is inclined downward and in a direction away from the cutting edge to form a deep cutting slope. Each of the recesses and each of the protrusions are arranged alternately and at intervals along the circumference of the end cap.

[0023] Furthermore, the auxiliary cutting device also includes an end head, the proximal side of which is provided as a cover portion for covering the sharp part and the blade portion of the cutting body;

[0024] The end is fixedly disposed at the distal end of the picking part of the surgical instrument. When the picking part of the surgical instrument is retracted, the end is simultaneously retracted and its covering part covers the sharp part and the blade part.

[0025] Furthermore, the distal end of the end is configured as an arc surface, and the outer contour of the end is rounded.

[0026] The outer periphery of the cover portion of the end can abut against the rounded outer periphery of the limiting portion provided on the outer periphery of the end cap.

[0027] Secondly, this application provides a stone retrieval basket that uses the auxiliary cutting device described in any of the preceding descriptions. The surgical instrument is the stone retrieval basket, which includes a retrieval section and a sheath. The retrieval section includes at least one elastic thread and an end and a sleeve respectively fixed to the distal and proximal ends of the elastic thread. The sleeve is disposed at the distal end of a connecting line inside the sheath, and the distal end of the sheath faces the retrieval section.

[0028] The cap of the auxiliary cutting device is matched and fixed to the distal end of the sheath. The sharp part of the cutting body is aligned with the center of the picking part. Each of the elastic lines passes through the first through hole of the end cap and is also limited by the sleeve.

[0029] Furthermore, the auxiliary cutting device is provided with a plurality of blade portions and a plurality of first through holes arranged alternately along the circumference of the end cap. The plurality of blade portions extend in a direction that spreads outward from the sharp point located at the center, and the cutting edges of the plurality of blade portions intersect and converge at the sharp point. The multiple elastic lines pass through the four first through holes respectively.

[0030] Thirdly, this application provides a snare that uses the auxiliary cutting device described in any of the preceding descriptions. The surgical instrument is the snare, and the snare includes a sheath and a retrieval part formed by at least two elastic threads.

[0031] The cap of the auxiliary cutting device is matched and fixed to the distal end of the sheath. The sharp part of the cutting body is aligned with the center of the picking part. Each of the elastic lines passes through the first through hole of the end cap.

[0032] Furthermore, the auxiliary cutting device is provided with at least two blade portions and at least two first through holes;

[0033] At least two of the blade portions are located on opposite sides of the sharp point, and are respectively extended from the sharp point located in the middle toward the opposite sides;

[0034] At least two first through holes are respectively disposed on opposite sides of the pointed portion, and each of the elastic threads passes through each of the first through holes in a corresponding manner.

[0035] Compared with the prior art, the auxiliary cutting device and the stone retrieval basket and snare using the auxiliary cutting device provided in this application are surgical instruments with a retrieval part and a sheath. The sheath is connected to the retrieval part, and the distal end of the sheath is set towards the retrieval part. The auxiliary cutting device includes an end cap, a cutting body is provided on the distal side of the end cap, and a cap body is provided on the proximal side of the end cap. The cap body opens in a direction away from the cutting body and is used to match and cover the distal head of the sheath of the surgical instrument (such as a stone retrieval basket or snare) for connection and fixation. The cutting body includes a sharp part and at least one blade part located circumferentially on the sharp part and in transition with the sharp part. The sharp surface of the sharp part and the cutting edge of the blade part are set in a direction away from the cap body, that is, in a direction towards the retrieval part of the surgical instrument.

[0036] With this configuration, when the elastic thread of the retrieval section of surgical instruments such as the stone retrieval basket and snare equipped with this auxiliary cutting device opens and grasps the stones or foreign objects that are large and hard to break, the sharp part of the cutting body of the auxiliary cutting device, located at the distal end of the sheath, can directly break the stones at the tip, while the blade part cuts the stones or foreign objects. This solves the problem of the difficulty in breaking large and hard stones. Furthermore, when this auxiliary cutting device is used with the snare, the sharp part can penetrate the tissue for fixation, and together with the blade part and elastic thread, the cut surface of the foreign object is smoother, reducing the possibility of wound inflammation, while avoiding damage to other tissues, improving the success rate of the operation, and reducing the workload of the doctor during the operation. Furthermore, this auxiliary cutting device requires minimal modification to existing surgical instruments with retrieval parts and sheaths, such as stone retrieval baskets or snares. It does not alter the internal structure of the original surgical instruments; only the size of the distal end of the sheath needs to be adjusted to assemble with the cap of the auxiliary cutting device. Assembly is simple, convenient, and highly operable, with few limitations on assembly conditions. The device is easy to use and can be widely applied to various surgical instruments with retrieval parts and sheaths, assisting them in effectively breaking and cutting the stones. Since the auxiliary cutting device is integrated with the surgical instrument it is attached to, the two are essentially a single unit. Therefore, after the stones are broken into smaller pieces, there is no need to repeatedly replace the cutting structure used for breaking them, reducing the complexity of the surgery and, to some extent, the difficulty of the surgeon's operation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the auxiliary cutting device provided in the embodiments of this application;

[0039] Figure 2 This is a schematic diagram of the auxiliary cutting device provided in the embodiment of this application assembled on the distal head of the sheath of a surgical instrument.

[0040] Figure 3 This is a cross-sectional schematic diagram of the auxiliary cutting device provided in the embodiments of this application after it is assembled with surgical instruments;

[0041] Figure 4 A schematic diagram of a stone retrieval basket without an auxiliary cutting device;

[0042] Figure 5 This is a schematic diagram of the structure of the stone-retrieving basket equipped with an auxiliary cutting device provided in an embodiment of this application;

[0043] Figure 6 for Figure 5 Enlarged detail image of section A;

[0044] Figure 7 This is a schematic diagram of the snare equipped with an auxiliary cutting device provided in an embodiment of this application.

[0045] Figure label:

[0046] 100 - Auxiliary cutting device;

[0047] 10-End cap;

[0048] 11-Cap body;

[0049] 12-Sharp point;

[0050] 121 - Sharp end;

[0051] 122-Cross-front;

[0052] 13-Blade edge;

[0053] 131 - Cutting edge;

[0054] 1311 - Sharp end face;

[0055] 1312 - Sharp bevel;

[0056] 14 - First through hole;

[0057] 15-Limiting part;

[0058] 151-convex part;

[0059] 1511 - Top of the convex part;

[0060] 152-concave;

[0061] 1521 - Deep cutting bevel;

[0062] 20-End;

[0063] 21-Industrial part;

[0064] 22-Elastic wire fixing hole;

[0065] 201-Sheath;

[0066] 202-Retrieval Department;

[0067] 2021 - Flexible Line;

[0068] 300-Stone Retrieval Basket;

[0069] 301 - Sleeve;

[0070] 302-Connector Cable;

[0071] 303 - Operations Section;

[0072] 400-Lasso. Detailed Implementation

[0073] 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.

[0074] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0075] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0076] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0077] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0078] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0079] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0080] like Figures 1 to 7 As shown, this application embodiment provides an auxiliary cutting device 100, which can be applied to various surgical instruments with a retrieval part 202 and a sheath 201, such as a stone retrieval basket 300 and a snare 400. The sheath 201 is connected to the retrieval part 202, and the distal end of the sheath 201 is positioned towards the retrieval part 202. The sheath 201 can drive the elastic cord 2021 of the retrieval part 202 to open and retract. Specifically, this application embodiment also provides a stone retrieval basket 300 and a snare 400 using this auxiliary cutting device 100.

[0081] Firstly, such as Figures 1 to 3As shown, the auxiliary cutting device 100 provided in this embodiment of the application may specifically include an end cap 10. A cutting body is provided at the distal end of the end cap 10, and a cap body 11 is provided at the proximal end of the end cap 10. The cap body 11 opens in a direction away from the cutting body. The opening of the cap body 11 is used to match and connect with the distal head of the sheath 201 of the aforementioned surgical instruments (such as a stone retrieval basket 300 or a snare 400), specifically through a threaded connection, etc., forming an integral structure with the surgical instruments. The cutting body specifically includes a sharp portion 12 and at least one blade portion 13 located circumferentially around and transitionally connected to the sharp portion 12. The sharp end 121 of the sharp portion 12 and the cutting edge 131 of the blade portion 13 are arranged in a direction away from the cap body 11, that is, towards the retrieval part 202 of the surgical instrument.

[0082] Compared with the prior art, the auxiliary cutting device 100 and the stone retrieval basket 300 and snare 400 using the auxiliary cutting device 100 provided in this application embodiment, when the elastic thread 2021 of the retrieval part 202 of the surgical instruments such as the stone retrieval basket 300 and snare 400 equipped with the auxiliary cutting device 100 opens and grasps the stones or foreign objects that are large and hard in texture to be broken, the sharp part 12 of the cutting body of the auxiliary cutting device 100, which is located at the distal end of the sheath 201, can directly break the stones with its tip, and the blade part 13 cuts the stones or foreign objects, thus solving the problem of difficulty in breaking large and hard stones in the existing technology; and when the auxiliary cutting device 100 is applied to the snare 400, the sharp part 12 can penetrate the tissue for fixation, and together with the blade part 13 and the elastic thread 2021, the end face of the cut part of the foreign object is smoother, reducing the possibility of wound inflammation, and avoiding This auxiliary cutting device 100 reduces damage to other tissues, improves surgical success rates, and decreases the workload of surgeons. Furthermore, it requires minimal modification to existing surgical instruments such as stone retrieval baskets 300 or snares 400, which have a retrieval section 202 and a sheath 201. It does not alter the internal structure of the original surgical instruments; only the size of the distal end of the sheath 201 needs to be compatible with the cap 11 of the end cap 10 of the auxiliary cutting device 100. Assembly is simple, convenient, and highly operable, with minimal limitations on assembly conditions. The device is easy to use and can be widely applied to various surgical instruments with a retrieval section 202 and a sheath 201, assisting them in effectively breaking and cutting the stones. Since the auxiliary cutting device 100 is integrated with the surgical instrument it is attached to, the two are essentially a single unit. Therefore, after the stone is broken into small pieces, there is no need to repeatedly replace the cutting structure used for breaking, reducing surgical complexity and, to some extent, the difficulty of the surgeon's operation.

[0083] A further embodiment is, as follows: Figures 1 to 3As shown, the end cap 10 of the aforementioned auxiliary cutting device 100 may further include at least one through-hole 14 located circumferentially on the pointed portion 12 and separated from the blade portion 13. This first through-hole 14 allows the elastic thread 2021 of the retrieval portion 202 of the surgical instrument to pass through. This arrangement allows for better integration with the structure of the surgical instrument, enabling the elastic thread 2021 of the retrieval portion 202 to pass directly through the first through-hole 14, facilitating the opening and closing of the retrieval portion 202. The overall integration of the two is stronger, making it more convenient to use and more operable. Furthermore, the retrieval portion 202 typically has multiple strands of elastic thread 2021, and preferably has multiple first through-holes 14, with each of the multiple first through-holes 14 corresponding to one of the multiple strands of elastic thread 2021.

[0084] In a preferred embodiment, the sharp part 12 of the cutting body of the aforementioned auxiliary cutting device 100 protrudes higher than each blade part 13. This ensures that when contacting the stone or foreign object to be broken, the most prominent sharp part 12 contacts and breaks the stone or foreign object first, and then the blade parts 13 further contact and cut the stone or foreign object, improving the stone-breaking effect and the foreign object-cutting effect.

[0085] Another preferred embodiment is that the end cap 10 of the preferred auxiliary cutting device 100 is provided with a plurality of blade portions 13 and a plurality of first through holes 14 evenly spaced, with a first through hole 14 provided between each two adjacent blade portions 13, and the plurality of first through holes 14 and the plurality of blade portions 13 are arranged alternately in the circumferential direction.

[0086] This configuration ensures that when the elastic lines 2021 of the retrieval section 202 contract, the cutting edge 131 of each blade section 13 is positioned between two elastic lines 2021, with the side of the blade section 13 blocked by the elastic lines 2021. When the retrieval section 202 opens, the side of the blade section 13 is still blocked by the elastic lines 2021, but at this time, the cutting edge 131 and the sharp point 12 of the blade section 13 are exposed. The stone or foreign object is surrounded and encased by each elastic line 2021, directly facing the sharp point 12 and the front end of the cutting edge 131, ensuring effective contact between the sharp point 12 and the cutting edge 131 of each blade section 13 and the stone or foreign object, thus guaranteeing safety and effectiveness during use.

[0087] Based on the aforementioned embodiments, preferably, the sharp part 12 is located at the center of the distal end of the end cap 10. On the one hand, when the picking part 202 is opened, the sharp part 12 is directly opposite the center of the picking part, resulting in the best breaking effect; on the other hand, being located at the center of the end cap 10 is most advantageous for being protected by the end cap 10 and by the end 20.

[0088] More preferably, each blade portion 13 extends in a direction that spreads outward from the sharp portion 12 to the periphery. Specifically, the sharp end face 1311 of the cutting edge 131 of each blade portion 13 can be extended into a straight line, an arch, or a circular arc shape, which is conducive to cutting.

[0089] like Figure 2 As shown, preferably, the cutting edges 131 of each blade portion 13 converge at the pointed portion 12, and preferably, the outer periphery of the pointed portion forms a cross-cutting surface 122. The pointed portion 12 then includes a central and most prominent pointed end 121 and cross-cutting surfaces 122 surrounding and connecting to the pointed end 121, further improving the cutting effect. Furthermore, preferably, each pointed portion 12 is cone-shaped or triangular, ensuring that it can first pierce the stone or foreign object, and then cooperate with each cutting edge 131 to make the stone or foreign object easier to break.

[0090] Furthermore, in an optional embodiment, the cutting edges 131 of each of the aforementioned blade portions 13 are spaced at the same angle. The uniform angle distribution makes the force when the stone or foreign object comes into contact with the cutting edge 131 more even, which facilitates the breaking of the stone or foreign object and can increase the depth to which the cutting edge 131 cuts into the stone or foreign object.

[0091] Another alternative embodiment is, as follows: Figure 2 As shown, the cross-section of the middle part of the cutting edge 131 of each blade 13 can be a single sharp bevel 1312 or a double sharp bevel 1312 that are symmetrical on both sides, which is a sharp shape that makes it easier for the cutting edge 131 to cut into the stone and make the stone easier to break.

[0092] like Figure 1 and Figure 2 As shown, further, the outer periphery of the distal end of the end cap 10 of the auxiliary cutting device 100 provided in this application embodiment may be provided with a limiting part 15, and the limiting part 15 is provided on the periphery of the cutting body, and the limiting part 15 includes at least one protrusion 151, the protrusion 151 covers and is connected to the outer side wall of the blade part 13, the number of protrusions 151 is the same as the number of blade parts 13, and the two are arranged in a one-to-one correspondence, the top of the protrusion 151 (i.e. the top of the protrusion 151) is higher than the blade part 13 and the sharp part 12, so that when the picking part is opened, the cutting edge 131 and the sharp part 12 of the blade part 13 are exposed and are not covered by the protrusion 151 of the limiting part 15, and the outer edge of the protrusion 151 is rounded, and the outer edge of the limiting part 15 is rounded.

[0093] This design ensures that the outer contour of the end cap 10 is rounded. When it comes into contact with internal tissues, the front end of the protrusion 151 (i.e., the top of the protrusion 1511) is higher than the sharp part 12 and the blade edge 131. This allows the protrusion 151 to contact the tissue first and slide off directly due to its rounded edges. Since there are no sharp points on the outside, it will not cause damage to the tissue it contacts. When the retrieval part 202 is closed, the sharp part 12 and the blade edge 131 in the middle of the end cap 10 are covered by the limiting part 15 of the end cap 10, which provides a certain degree of protection and improves safety. When the retrieval part 202 is opened, the side of the blade edge 131 is blocked by the elastic line 2021, while the blade edge 131 and the sharp part 12 are exposed. After the retrieval part 202 grabs the stone or foreign object, the sharp part 12 and the blade edge 131 are directly facing the lower end of the stone or foreign object, ensuring safety and effectiveness during use.

[0094] Based on the aforementioned embodiments, the limiting portion 15 may further include at least one recess 152, each of which is correspondingly provided with the aforementioned first through hole 14. The sidewall of the recess 152 that connects to the bottom of the cutting edge 131 of the blade portion 13 is inclined downwards and in a direction away from the cutting edge 131, forming a deep cutting bevel 1521. Each recess 152 and each protrusion 151 is alternately and spaced along the circumference of the end cap 10. Preferably, the outer ends of each first through hole 14 are inclined outwards and downwards, so that the overall shape of the limiting portion 15 is converging inwards.

[0095] The recesses 152 increase the depth of the blade 13 and the sharp point 12 into the stone or foreign object, thereby increasing the cutting depth. This reduces the likelihood that the blade 13 and the sharp point 12 will penetrate the stone or foreign object without breaking it, thus improving the success rate of stone fragmentation.

[0096] like Figure 1As shown, the auxiliary cutting device 100 provided in this application embodiment may further include an end head 20. The proximal side of the end head 20 is configured as a cover portion 21, which is used to cover and cover the sharp part 12 and the blade part 13 of the cutting body. The end head 20 is used to fix the distal end of the retrieval part 202 of the surgical instrument (such as the stone retrieval basket 300 or the snare 400). When the retrieval part 202 is retracted, that is, when the elastic line 2021 of the retrieval part 202 is retracted through the first through hole 14, the end head 20 at the distal end of the elastic line 2021 is simultaneously retracted to the end head 20. At the cutting body position of the end cap 10 of the auxiliary cutting device 100, the limiting part 15 of the auxiliary cutting device 100 can limit the end 20. The outer periphery of the cover part 21 of the end 20 can abut against the rounded outer periphery of the limiting part 15. At this time, the cover part 21 of the end 20 covers the sharp part 12 and the blade part 13. That is, when the end 20 is tightened by the elastic line 2021, it can cover the sharp part 12 and the blade part 13, which can protect the patient and doctor from being injured or damaged by the sharp part 12 and the blade part 13.

[0097] Furthermore, the outer contour of the end 20 is preferably rounded, with the distal end of the end 20 being an arc surface. When the end 20 and the elastic line 2021 are tightened, only the rounded outer end 20 and the limiting part 15 are exposed, further ensuring the safety of both the doctor and the patient. Moreover, when entering a human cavity, the auxiliary cutting device 100 can only contact the rounded outer contour of the limiting part 15 and the end 20. Furthermore, when a stone is grasped and removed from the body, the tightened retrieval part 202 and the stone or foreign object will not expose the sharp part 12 or the blade part 13, ensuring the safe use of the cutting instrument.

[0098] Secondly, such as Figures 2 to 6As shown, this application embodiment also provides a stone retrieval basket 300, which applies the auxiliary cutting device 100 of any of the aforementioned embodiments. The aforementioned surgical instrument is specifically the stone retrieval basket 300. The stone retrieval basket 300 may specifically include a retrieval part 202, a sheath 201, and an operating part 303. The retrieval part 202 includes at least one elastic wire 2021 and an end 20 and a sleeve 301 respectively fixedly disposed at the distal and proximal ends of the elastic wire 2021. The end 20 may have an elastic wire fixing hole 22 in the cover part 21 for fixing the elastic wire 2021. The sleeve 301 is disposed in the sheath 201. The distal end of the connecting line 302 inside the sheath 201 is positioned towards the object-retrieving part 202. The operating part 303 is connected to the connecting line and can drive the object-retrieving part 202 to open or retract. Correspondingly, the cap body 11 of the end cap 10 of the auxiliary cutting device 100 matches and covers the distal head of the sheath 201 and is fixed. The sharp part 12 of the cutting body of the auxiliary cutting device 100 is aligned with the center of the object-retrieving part 202. Each elastic thread 2021 of the object-retrieving part 202 passes through each of the first through holes 14 of the end cap 10 and is also limited by the sleeve 301.

[0099] With this configuration, when the elastic line 2021 of the retrieval section 202 of the stone retrieval basket 300 opens and grasps the large and hard stones to be broken, the sharp part 12 of the cutting body of the auxiliary cutting device 100 can directly break the stones at the tip, and the blade part 13 can cut the stones, solving the problem of the difficulty in breaking large and hard stones. Furthermore, since the auxiliary cutting device 100 and the stone retrieval basket 300 are integrated into a single structure, there is no need to repeatedly replace the cutting structure used for breaking after the stones are broken into small pieces, reducing the complexity of the surgery and reducing the difficulty of operation for doctors to a certain extent.

[0100] like Figures 2 to 6 As shown, a specific embodiment is provided in this application. The stone retrieval basket 300 is illustrated by example with four elastic wires 2021. It should be understood that the actual number of elastic wires 2021 in the stone retrieval basket 300 is set according to actual needs. It can be set not only four, but also any number of two or more, if it is actually allowed.

[0101] Specifically, the auxiliary cutting device 100 may be provided with a plurality (e.g., four) blade portions 13 and a plurality (e.g., four) first through holes 14 arranged alternately in the circumference of the end cap 10. The plurality (e.g., four) blade portions 13 extend in a direction that spreads outward from the sharp portion 12 located at the center, and the cutting edges 131 of the plurality (e.g., four) blade portions 13 intersect and converge at the sharp portion 12. Multiple (e.g., four) elastic wires 2021 pass through the plurality (e.g., four) first through holes 14 one by one.

[0102] Thirdly, such as Figure 7 As shown, this application embodiment also provides a snare 400, which applies the auxiliary cutting device 100 of any of the aforementioned embodiments. The aforementioned surgical instrument is specifically the snare 400. The snare 400 may specifically include a sheath 201 and a retrieval part 202 formed by at least two elastic threads 2021. The cap body 11 of the end cap 10 of the auxiliary cutting device 100 matches and is connected and fixed to the distal end of the sheath 201. The sharp part 12 of the cutting body of the auxiliary cutting device 100 is aligned with the center of the retrieval part 202. Each elastic thread 2021 is respectively arranged through each first through hole 14 of the end cap 10.

[0103] With this configuration, when the auxiliary cutting device 100 is applied to the snare 400, its sharp part 12 can penetrate the tissue for fixation. Together with the blade part 13 and the elastic line 2021, it can make the end face of the cut part of the foreign object smoother, reduce the possibility of wound inflammation, and avoid damage to other tissues, thereby improving the success rate of the operation and reducing the workload of the doctor during the operation. Furthermore, since the auxiliary cutting device 100 and the snare 400 are configured as an integral structure, there is no need to repeatedly replace the cutting structure used for breaking down stones after they are broken into small pieces, which reduces the complexity of the operation and reduces the difficulty of the doctor's operation to a certain extent.

[0104] One specific embodiment is, as follows: Figure 6 As shown in the figure, this application embodiment takes the snare 400 symmetrically provided with two elastic lines 2021 as an example for specific explanation. In fact, the number of elastic lines provided in the snare 400 depends on the specific needs and is not limited to two lines.

[0105] Specifically, the auxiliary cutting device 100 has at least two blade portions 13 and at least two first through holes 14. The at least two blade portions 13 are located on opposite sides of the sharp portion 12 and extend from the sharp portion 12 located in the middle to the opposite sides. The at least two first through holes 14 are respectively located on opposite sides of the sharp portion 12, and the at least two elastic threads 2021 pass through the at least two first through holes 14 one by one. When applied to the snare device 400 with a two-hole structure, the sharp portion 12 pierces the tissue to play a fixing role, and the outer snare (such as being composed of two elastic threads 2021) tightens to cooperate with the sharp portion 12 and the blade portions 13 to cut, making the wound surface smaller.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An auxiliary cutting device, used in surgical instruments with a retrieval section and a sheath, characterized in that, The auxiliary cutting device includes: an end cap, a cutting body is provided on the distal side of the end cap, a cap body is provided on the proximal side of the end cap, and the cap body is open in a direction away from the cutting body for matching, covering and connecting with the distal head of the sheath of the surgical instrument for fixation. The cutting body includes a sharp part and at least one blade part located circumferentially on the sharp part and in transition with the sharp part, wherein the sharp end of the sharp part and the cutting edge of the blade part are arranged in a direction away from the cap body.

2. The auxiliary cutting device according to claim 1, characterized in that, The end cap further includes: at least one through hole located circumferentially on the pointed portion and spaced apart from the blade portion, the first through hole being for the elastic thread of the retrieval portion of the surgical instrument to pass through.

3. The auxiliary cutting device according to claim 2, characterized in that, The pointed portion protrudes higher than each of the blade portions.

4. The auxiliary cutting device according to claim 3, characterized in that, The end cap is provided with a plurality of blade portions and a plurality of first through holes at even intervals; A first through hole is provided between each two adjacent blade portions, and a plurality of first through holes and a plurality of blade portions are arranged alternately and at intervals along the circumferential direction; Furthermore, the multiple first through holes are arranged to pass through the multiple elastic threads of the picking part of the surgical instrument in a one-to-one correspondence.

5. The auxiliary cutting device according to claim 4, characterized in that, The pointed portion is located at the center of the distal end of the end cap; Each of the blade portions extends in a direction that spreads outward from the sharp point, and the cutting edges of each blade portion intersect and converge at the sharp point.

6. The auxiliary cutting device according to claim 5, characterized in that, The cutting edges of each of the aforementioned blade portions are spaced at the same angle; and / or The cross-section of the middle part of the cutting edge of each of the blade portions is a single sharp bevel or a symmetrical double sharp bevel.

7. The auxiliary cutting device according to claim 6, characterized in that, The sharp end face of the cutting edge of each of the aforementioned blade portions is straight, arched, or arc-shaped; and / or The shape of each of the pointed parts is conical or triangular.

8. The auxiliary cutting device according to any one of claims 2 to 7, characterized in that, A limiting portion is provided on the outer periphery of the distal side of the end cap, and the limiting portion is located on the periphery of the cutting body. The limiting portion includes at least one protrusion, which covers and is connected to the outer wall of the blade portion. The top of the protrusion is higher than the blade portion and the sharp portion, and the outer edge of the protrusion is rounded.

9. The auxiliary cutting device according to claim 8, characterized in that, The limiting part further includes at least one recess, and each recess is provided with the first through hole. The side wall of the recess that is in contact with the bottom of the cutting edge of the blade part is inclined downward and in a direction away from the cutting edge to form a deep cutting slope. Each recess and each protrusion is arranged alternately and at intervals along the circumference of the end cap.

10. The auxiliary cutting device according to any one of claims 2 to 7, characterized in that, It also includes an end cap, the proximal side of which is provided as a cover portion for covering the sharp portion and the blade portion of the cutting body; The end is fixedly disposed at the distal end of the picking part of the surgical instrument. When the picking part of the surgical instrument is retracted, the end is simultaneously retracted and its covering part covers the sharp part and the blade part.

11. The auxiliary cutting device according to claim 10, characterized in that, The distal end of the end is provided as an arc surface, and the outer contour of the end is rounded. The outer periphery of the cover portion of the end can abut against the rounded outer periphery of the limiting portion provided on the outer periphery of the end cap.

12. A stone-collecting basket, characterized in that, The auxiliary cutting device according to any one of claims 2 to 11, wherein the surgical instrument is the stone retrieval basket, the stone retrieval basket includes a retrieval part and a sheath, the retrieval part includes at least one elastic wire and an end and a sleeve respectively fixedly disposed at the distal end and proximal end of the elastic wire, the sleeve is disposed at the distal end of the connecting wire inside the sheath, and the distal end of the sheath is disposed toward the retrieval part; The cap of the auxiliary cutting device is matched and fixed to the distal end of the sheath. The sharp part of the cutting body is aligned with the center of the picking part. Each of the elastic lines passes through the first through hole of the end cap and is also limited by the sleeve.

13. The stone-collecting basket according to claim 12, characterized in that, The auxiliary cutting device is provided with a plurality of blade portions and a plurality of first through holes arranged alternately along the circumference of the end cap. The plurality of blade portions extend in a direction that spreads outward from the sharp point located at the center, and the cutting edges of the plurality of blade portions intersect and converge at the sharp point. The plurality of elastic lines pass through the plurality of first through holes respectively.

14. A snare, characterized in that, The surgical instrument is the snare, which includes a sheath and a retrieval part formed by at least two elastic threads, and is used in any one of claims 2 to 9. The cap of the auxiliary cutting device is matched and fixed to the distal end of the sheath. The sharp part of the cutting body is aligned with the center of the picking part. Each of the elastic lines passes through the first through hole of the end cap.

15. The snare device according to claim 14, characterized in that, The auxiliary cutting device is provided with at least two blade portions and at least two first through holes; At least two of the blade portions are located on opposite sides of the sharp point, and are respectively extended from the sharp point located in the middle toward the opposite sides; At least two first through holes are respectively disposed on opposite sides of the pointed portion, and each of the elastic threads passes through each of the first through holes in a corresponding manner.

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