Calculus capturing device and auxiliary device

Abstract

A stone capture device, which is of an elongated structure and can be used in conjunction with an endoscope, includes a proximal end, a distal end, and a negative pressure channel having openings in both the proximal end and the distal end and extending therebetween, and the proximal end can be hermetically and detachably connected to a tip of the endoscope, and the distal end can be hermetically and detachably connected to the tip of the endoscope. And an auxiliary device for mounting the capturing device to the tip of the endoscope, the auxiliary device comprising a main body portion, a protruding portion, and a guide rod, such that the working channel of the endoscope can be communicated with the negative pressure channel, and the auxiliary device comprising a main body portion, a protruding portion, and a guide rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a combination device for urology. More particularly, the utility model relates to a combination device for capturing stones, which comprises a negative pressure capturing basket and an auxiliary device that can be connected to the tip of an endoscope and uses the negative pressure of the working channel of the endoscope to capture stones. BACKGROUND

[0002] Urinary stones are a common urological disease, usually caused by excessive dissolved substances in urine or poor excretion. In recent years, stone capturing baskets have gradually attracted attention in the medical community as a new type of treatment tool. The stone capturing basket is a kind of net-like basket device made of soft material, which can enter the kidney through the urethra or other ways. Its design purpose is to capture and remove stones in the urinary tract and kidneys during surgery, so as to achieve the purpose of treatment.

[0003] The existing stone capturing basket has problems in treating urinary stones, mainly including:

[0004] 1. High technical requirements for operation: The operation of the stone capturing basket requires experienced doctors, and the operation technology and hand-eye coordination ability are required. Doctors lacking experience may make mistakes, resulting in failure to capture or damage to the urinary tract tissue.

[0005] 2. Limited capture efficiency: Due to the different size, shape and location of the stones in the kidney, the capture efficiency of the stone capturing basket has certain limitations. Especially for larger or harder stones, the basket may not be able to completely capture or capture incompletely, and other treatment methods need to be combined for processing.

[0006] 3. Complications: When using the stone capturing basket for treatment, some complications may occur, such as urinary tract infection, bleeding, urethral injury, etc. The occurrence of these complications is closely related to the operation technology, individual differences of patients and the design of the basket.

[0007] In summary, the stone capturing basket as a new type of urinary stone treatment technology, while solving the problems existing in traditional treatment methods, also faces a series of challenges and technical problems to be solved. UTILITY MODEL CONTENT

[0008] The utility model provides a kind of device for removing urinary stone by negative pressure and the auxiliary tool matched with it.

[0009] According to one aspect of the utility model, a stone capturing device is provided, which is basically an elongated structure and can be used with an endoscope, comprising a proximal end, a distal end, and a negative pressure channel, the negative pressure channel has openings at the proximal end and the distal end and extends between the two, and

[0010] The proximal end can be connected to the endoscope tip airtight and detachably, so that the working channel of the endoscope can be communicated with the negative pressure channel.

[0011] According to the stone capturing device, the negative pressure channel comprises an upper cavity near the distal end and a lower cavity near the proximal end, wherein the opening of the upper cavity at the distal end has a portion with gradually increasing inner diameter in the distal direction.

[0012] According to the stone capturing device, the lower cavity of the device can accommodate the tip of the endoscope, and the inner surface of the lower cavity and the outer surface of the tip are matched airtight.

[0013] According to the stone capturing device, the upper cavity is non-coaxial with the lower cavity, and the axis of the distal opening of the upper cavity is deviated from the axis of the lower cavity.

[0014] According to the stone capturing device, the upper cavity is non-coaxial with the lower cavity, and the angle between the axis of the distal opening of the upper cavity and the axis of the lower cavity is 10-60 degrees.

[0015] According to the stone capturing device, the wall of the upper cavity is thinner and softer than the wall of the lower cavity.

[0016] According to the stone capturing device, there is a transition part between the upper cavity and the lower cavity, and the cross-sectional area of the negative pressure channel of the transition part is smaller than that of the lower cavity.

[0017] According to the stone capturing device, the transition part is composed of two positioning parts which are oppositely arranged in the radial direction and are connected to the respective minor arcs of the inner wall of the transition part and together define a gap therebetween, wherein when the lower cavity of the capturing device is sleeved into the tip, the two positioning parts can block part of the end surface of the tip to limit the further movement of the tip in the distal direction, and the gap between the two positioning parts can expose the working channel, the lens and the illuminating lamp on the tip.

[0018] According to the stone capturing device, the outer wall of the negative pressure capturing basket is provided with an annular weak area, and the bending resistance at the weak area is relatively smaller than that of other parts of the outer wall of the negative pressure capturing basket.

[0019] According to the stone capturing device, the negative pressure channel can be provided with radial reinforcing supports.

[0020] According to the stone capturing device, the radial reinforcing supports are springs.

[0021] According to the calculus capturing device, the proximal end portion is made of elastic material and can be folded outwardly to cover the rest of the device; the distal end portion is made of elastic material and is transparent.

[0022] According to the calculus capturing device, a sieve plate is arranged between the upper cavity and the lower cavity.

[0023] According to the calculus capturing device, the sieve plate is 1-10 mm away from the distal end.

[0024] According to one aspect of the present application, an auxiliary device for installing the calculus capturing device to the distal end of an endoscope is provided, which comprises

[0025] a main body portion,

[0026] a protruding portion, one end of which is connected to the main body portion, the protruding portion further defines a hollow portion extending in the axial direction, the inner diameter of the hollow portion matches the outer diameter of the capturing device, the capturing device can be inserted into the hollow portion, and the hollow portion is coaxial with the capturing device; and

[0027] a guide rod comprising a front end and a rear end, the rear end of the guide rod is connected to the main body portion, the rest of the guide rod is located in the hollow portion and extends in the axial direction, wherein the front end of the guide rod can be inserted into the working channel of the endoscope.

[0028] According to the auxiliary device, when the capturing device is located in the hollow portion, the guide rod is inserted into the negative pressure channel of the capturing device.

[0029] According to the auxiliary device, when the capturing device is located in the hollow portion and the distal end of the endoscope is located in the lower cavity of the capturing device, the guide rod is inserted into the working channel of the distal end of the endoscope.

[0030] According to the auxiliary device, the diameter of the guide rod uniformly or stepwise increases from the front end to the rear end, so that the guide rod can be prevented from being further inserted after being inserted into the working channel of the endoscope for a certain distance.

[0031] According to the auxiliary device, the auxiliary device further comprises a basket folding plate, which is located at the front end of the protruding portion and extends in the axial direction, and which is discontinuous in the circumferential direction and can be composed of several parts with equal arc length, and the basket folding plate defines a hollow portion, the hollow portion is continuous with the hollow portion of the protruding portion in the inner wall, the guide rod also extends in the axial direction in the hollow portion defined by the basket folding plate, and the folding portion of the proximal end of the capturing device can be folded outwardly and covered on the basket folding plate.

[0032] According to the auxiliary device, wherein the folded portion is a portion of the negative pressure capturing basket from the proximal end to the weak area.

[0033] According to the auxiliary device, further comprising a positioning seat connected to the rear end of the guide rod, the positioning seat being movable in the radial direction so as to drive the front end of the guide rod to move in the radial direction.

[0034] According to the auxiliary device, the main body portion comprises an upper cover and a lower cover, the upper cover and the lower cover being coaxial with the hollow portion of the protruding portion, and the upper cover and the lower cover being axially combined together, wherein the lower cover is connected to the protruding portion; the upper cover is provided with a positioning slot extending in the radial direction, and the positioning seat is movable along the positioning slot.

[0035] According to the auxiliary device, further comprising a base and a knob, the base being located at the rear end of the positioning seat and being internally threaded, and the base having an outer diameter greater than the width of the positioning slot; the front end of the knob is provided with an elongated portion having external threads, the elongated portion of the knob being capable of passing through the positioning slot and being inserted into the internal threads of the base, and the internal threads and the external threads being capable of being screwed together to fix the positioning seat at a certain position in the radial direction.

[0036] According to the auxiliary device, wherein

[0037] The inner wall of the upper cover is provided with two or more sets of guide plates, each set of guide plates being composed of two adjacent sub-plates, the guide plates extending in the axial and radial directions and defining a guide space between the two sub-plates, and the lower cover being provided with a guide strip, the guide strip being capable of sliding into the guide plates when the upper cover and the lower cover are close to each other, so that the upper cover and the lower cover are capable of being slidingly combined and axially relatively moved.

[0038] According to the auxiliary device, wherein the guide strip is provided with a cantilever at one end of the guide strip which first engages the upper cover in the axial direction, the cantilever having elasticity capable of being deformed in the radial direction, and the two sub-plates constituting the guide plates are provided with a clamping protrusion close to the inner wall of the upper cover, the cantilever being capable of being deformed to pass through the clamping protrusion when the guide strip enters the guide space.

[0039] According to the auxiliary device, wherein the upper cover and the lower cover are combined together by threads.

[0040] According to one aspect of the present application, a combined device for capturing stones by negative pressure is provided, comprising

[0041] A negative pressure capturing basket, which is an elongated structure, comprising

[0042] a proximal end,

[0043] a distal end, and

[0044] a negative pressure channel having openings at both the proximal end and the distal end and extending therebetween, and

[0045] the proximal end can be connected airtightly and detachably to the endoscope tip so that the working channel of the endoscope can be communicated with the negative pressure channel, and

[0046] an auxiliary device, the auxiliary device comprising

[0047] a main body portion,

[0048] a protruding portion connected at one end to the main body portion, the protruding portion further defining a hollow portion extending in the axial direction, the inner diameter of the hollow portion being matched with the outer diameter of the capturing device, and

[0049] a guide rod connected at the rear end to the main body portion, the rest of the guide rod being located in the hollow portion and extending in the axial direction, wherein the front end of the guide rod can be inserted into the working channel of the endoscope,

[0050] a basket folding plate located at the front end of the protruding portion and extending in the axial direction, and defining a hollow portion, the hollow portion being continuous with the inner wall of the hollow portion of the protruding portion, wherein

[0051] the rest of the negative pressure capturing basket, except the proximal end portion, is located in the hollow portion defined by the protruding portion and the basket folding plate, and is coaxial with the hollow portions of both, the guide rod is located in the negative pressure channel of the negative pressure capturing basket, and the proximal end portion of the capturing device is folded outwards and is sleeved on the basket folding plate.

[0052] According to the combination device, wherein the negative pressure channel of the negative pressure capturing basket comprises an upper cavity near the distal end, and a lower cavity near the proximal end, wherein the upper cavity has a portion with gradually increasing inner diameter in the distal direction at the opening of the distal end.

[0053] According to the combination device, wherein the lower cavity of the negative pressure capturing basket can accommodate the tip of the endoscope, wherein the inner surface of the lower cavity and the outer surface of the tip are matched to be airtight.

[0054] According to the combination device, the upper cavity and the lower cavity have a transition portion therebetween, the cross-sectional area of the negative pressure channel of the transition portion being smaller than that of the lower cavity.

[0055] According to the combination device, the transition part of the negative pressure capturing basket is composed of two positioning parts which are oppositely arranged in the radial direction and are connected to the two inferior arcs of the inner wall of the transition part and define a gap between them, wherein when the lower cavity of the capturing device is sleeved on the tip, the two positioning parts can block part of the end surface of the tip to limit the further movement of the tip to the distal end.

[0056] According to the combination device, the negative pressure channel of the negative pressure capturing basket is provided with radial reinforcing support.

[0057] According to the combination device, the radial reinforcing support is a spring, for example, the spring can be in the form of half-wrapping in the inner wall of the negative pressure channel.

[0058] According to the combination device, the folding parts of the upper cavity and the lower cavity are not provided with the radial support, for example, the spring.

[0059] According to the combination device, the proximal end part of the negative pressure capturing basket is made of elastic material.

[0060] According to the combination device, the distal end part of the negative pressure capturing basket is made of elastic material and is transparent.

[0061] According to the combination device, a sieve plate is arranged between the upper cavity and the lower cavity.

[0062] According to the combination device, the sieve plate is 1-10 mm away from the tip.

[0063] According to the combination device, the auxiliary device further comprises a positioning seat which is connected to the rear end of the guide rod and can move in the radial direction to drive the front end of the guide rod to move in the radial direction.

[0064] According to the combination device, the main body part of the auxiliary device comprises an upper cover and a lower cover which are coaxial with the hollow part of the protruding part and can be combined together in the axial direction, wherein the lower cover is connected to the protruding part; the upper cover is provided with a positioning groove which extends in the radial direction, and the positioning seat can move along the positioning groove.

[0065] According to the combination device, the auxiliary device further comprises a knob, the rear end of the positioning seat is provided with a threaded hole, the outer diameter of the positioning seat is greater than the width of the positioning groove; the front end of the knob is provided with an elongated part which is provided with external threads, the elongated part of the knob can pass through the positioning groove and be inserted into the threaded hole of the rear end of the positioning seat, and the internal threads and the external threads are matched and screwed to fix the positioning seat at a certain position in the radial direction by the knob and the base.

[0066] According to the combination device, the outer wall of the negative pressure capturing basket is provided with an annular weak area, and the bending resistance of the weak area is smaller than that of other parts of the outer wall of the negative pressure capturing basket.

[0067] According to the combination device, the diameter of the guide rod increases uniformly or in steps from the front end to the rear end, so that the further insertion of the guide rod can be prevented after the front end of the guide rod is inserted into the working channel of the endoscope by a certain distance.

[0068] According to the combination device,

[0069] The upper cover is provided with two or more groups of guide plates extending in the axial and radial directions on the inner wall of the upper cover, and the two or more groups of guide plates extend to the end surface where the upper cover starts to engage with the lower cover in the axial direction, each group of guide plates includes two sub-plates close to each other, and each two sub-plates define a guide space; and

[0070] The lower cover is provided with two or more guide strips extending in the axial and radial directions on the side of the lower cover facing the upper cover, and when the upper cover and the lower cover move coaxially and close to each other, the two or more guide strips can be inserted into the guide space of the upper cover, thereby stabilizing and guiding the sliding engagement between the upper cover and the lower cover in the axial direction.

[0071] According to the combination device, the guide strip is provided with a cantilever at one end of the guide strip that first engages with the upper cover, and the cantilever has elasticity that can be deformed in the radial direction; a clamping protrusion is arranged between the two plates of the guide plate and close to the inner wall of the upper cover, and the cantilever can be deformed to pass through the clamping protrusion when the guide strip enters the guide space.

[0072] According to the combination device, the upper cover and the lower cover are slidingly or threadedly engaged together.

[0073] Another aspect of the present application also separately provides the auxiliary device for helping to install the negative pressure capturing basket and the tip of the endoscope together.

[0074] According to the auxiliary device, the auxiliary device comprises a main body part, a protruding part, one end of the protruding part being connected to the main body part, the protruding part further defining a hollow part extending in the axial direction, the inner diameter of the hollow part matching the outer diameter of the capturing device, and a guide rod, the rear end of the guide rod being connected to the main body part, the remaining part of the guide rod being located in the hollow part and extending in the axial direction, wherein the front end of the guide rod can be inserted into the working channel of the endoscope.

[0075] According to the auxiliary device, further comprising a basket folding plate located at the front end of the protruding portion and extending in the axial direction, and the basket folding plate defines a hollow portion which is continuous with the hollow portion of the protruding portion on the inner wall, wherein

[0076] The negative pressure capturing basket is located in the hollow portion defined by the protruding portion and the basket folding plate except for the proximal end portion, and is coaxial with the hollow portions of both, the guide rod is located in the negative pressure channel of the negative pressure capturing basket, and the portion of the capturing device close to the proximal end is folded outwards from the inside and sleeved on the basket folding plate.

[0077] The utility model discloses still one aspect provides a kind of method for installing the negative pressure capturing basket to endoscope tip by the combined device, comprising the following steps:

[0078] (1) the capturing device is coaxially arranged with endoscope tip;

[0079] (2) the front end of the guide rod is inserted into the working channel of endoscope tip;

[0080] (3) continue to insert the guide rod into the working channel, while the tip is inserted into the negative pressure channel of the capturing device;And

[0081] (4) the proximal end of the capturing device is sleeved on the folded portion of the basket folding plate and folded back to the tip.

[0082] According to the method, further comprising adjusting the position of the positioning seat in the radial direction according to the position of the working channel of endoscope tip, so that the guide rod is aligned with the working channel of endoscope tip to facilitate insertion.

[0083] According to the method, further comprising folding the folded portion of the proximal end of the negative pressure capturing basket in advance and sleeving it on the basket folding plate.

[0084] These and other aspects of the utility model will become apparent from and will be elucidated with reference to the embodiments described hereinafter, which are described by way of example only. BRIEF DESCRIPTION OF DRAWINGS

[0085] Embodiments of the utility model will now be described, by way of example only, with reference to the accompanying drawings in which:

[0086] Figure 1 is a negative pressure capturing basket of the utility model.

[0087] Figure 2 is Figure 1 the axial sectional view of the negative pressure capturing basket.

[0088] Figure 3 isFigure 1 A view from the far end of the negative pressure capture basket.

[0089] Figure 4 yes Figure 1 Another axial cross-sectional view of the negative pressure capture basket.

[0090] Figure 5 This is a schematic diagram of a device for a negative pressure capture basket according to the present invention, including an upper cover and a lower cover.

[0091] Figure 6 yes Figure 5 Axial section view of the fixture.

[0092] Figure 7 This is a schematic diagram of the guide rod and positioning seat of the fixture of this utility model.

[0093] Figure 8 yes Figure 7 Axial section view.

[0094] Figure 9 This is a schematic diagram of the guide rod and positioning seat of the device of this utility model, wherein the knob is screwed onto the positioning seat.

[0095] Figure 10 This is an axial cross-sectional view of a fixture according to this utility model.

[0096] Figure 11 This is a schematic diagram of the top cover of a device according to this utility model.

[0097] Figure 12 This is a schematic diagram of a device according to the present invention, wherein the negative pressure capture basket of the present invention is inserted therein.

[0098] Figure 13 yes Figure 12 Cross-sectional view of the fixture and negative pressure capture basket shaft.

[0099] Figure 14 This is an assembly axial cross-sectional view of the negative pressure capture basket, fixture, and endoscope tip of this utility model.

[0100] Figure 15 This is an axial cross-sectional view of the fixture and negative pressure capture basket of this utility model, wherein the proximal end of the negative pressure capture basket is folded and fitted onto the folding plate of the net basket.

[0101] Figure 16 This is an axial cross-sectional view of the negative pressure capture basket with sieve plate of this utility model.

[0102] Figure 17 This is a schematic diagram of the negative pressure capture basket with a sieve plate of this utility model.

[0103] Figure 18 This is a schematic diagram of the negative pressure capture basket with a sieve plate of this utility model.

[0104] Figure 19 is a schematic view of another placement device of the utility model.

[0105] Figure 20 is Figure 19 the axial section view of the placement device upper cover.

[0106] Figure 21 is the axial section view of the placement device upper cover of the utility model Figure 19 .

[0107] Figure 22 is a schematic view of the placement device lower cover of the utility model Figure 19 .

[0108] Figure 23 is the top view of the placement device upper cover along the axial direction and exposing the positioning slot of the utility model Figure 19 .

[0109] Figure 24 is a schematic view of the placement device lower cover of the utility model Figure 19 .

[0110] Figure 25 is a schematic view of another implementation mode of the negative pressure capture basket of the utility model.

[0111] Figure 26 is the axial section view of another implementation mode of the negative pressure capture basket of the utility model.

[0112] Figure 27 is the axial section view of another implementation mode of the negative pressure capture basket of the utility model.

[0113] Figure 28 is the axial section view of the negative pressure capture basket with enhanced support of the utility model. DETAILED DESCRIPTION

[0114] The utility model installs the negative pressure capture basket at the lens port to suck out the calculus during operation. The negative pressure capture basket of the utility model is different from the traditional calculus capture basket which is inserted into the capture basket composed of metal filaments in the working channel to grab. The capture basket of the utility model only needs to be sleeved at the tip of the ureteroscope by the placement device to work. After the negative pressure capture basket is sent to the position needing to be sucked, the working channel is given negative pressure to suck, and water is given at the gap between the sheath. The distal end opening of the negative pressure capture basket is close to the calculus, and smaller calculus debris can be directly sucked out together with the water flow by the negative pressure in the negative pressure channel, and larger calculus is sucked, and then the operator can drag the mirror to suck out the calculus or drag it to the appropriate position for further disposal.

[0115] Figure 1 andFigure 2 The utility model discloses a kind of negative pressure capture baskets. Negative pressure capture basket 10 is basically elongated structure, including proximal end 18 and distal end 15, with a negative pressure passage 19 in capture basket 10 inside extends in axial direction, respectively in proximal end 18 and distal end 15 form opening. Water groove 12 is opened in the inner side close to distal end 15, and protrusion 11 is provided on the outer side close to distal end 15. Thickened sealing ring 17 is provided close to proximal end 18. Weak area 16, for example, bending groove, is provided on the outer wall of negative pressure capture basket 10, which has smaller bending resistance.

[0116] In an embodiment of the utility model, negative pressure capture basket 10 is basically elongated cylinder, and the negative pressure passage 19 in its inside can be divided into two parts, lower cavity 192 close to proximal end 18 and upper cavity 191 close to distal end 15. The inner diameter of upper cavity 191 can be inconsistent, for example, in the shape of a trumpet mouth, that is, the inner diameter of upper cavity 191 gradually increases in the direction of distal end 15. Such design can increase the contact area with stones, and more conveniently adsorb stones by distal end 15; at the same time, the adsorption area is also expanded, which is more convenient for negative pressure to remove stone debris, blood clots and soft tissue fragments, etc. There is a transition part 13 between upper cavity 191 and lower cavity 192, and the inner diameter of the negative pressure passage 19 at the transition part 13 is smaller than that of upper cavity 191 and lower cavity 192. When the tip of the endoscope enters the lower cavity 192, the outer diameter of the tip is matched with the inner diameter of the lower cavity 192, for example, the material of the lower cavity 192 has a certain elasticity, and the two can be interference fit, so that the air tightness between the two can be achieved. At the same time, the transition part 13 can limit the position of the endoscope tip entering the lower cavity 192, so that it stops between the upper cavity 192 and the lower cavity 192. In an alternative, as shown in FIG. 2, the transition part 13 can be composed of two parts 131, 132 opposite in the radial direction, and each part 131, 132 is connected to the inner wall of the negative pressure passage 19 with a poor arc, defining a certain space in between. The space can be matched with the layout of the end face of the endoscope tip, exposing the working channel, lens and light source / illumination lamp, such as LED, of the endoscope tip end face, which can provide a path, field of view and illumination for subsequent negative pressure extraction of stone fragments. The tip working channel is communicated with the negative pressure passage 19, and when the endoscope rear end is connected to the negative pressure source, negative pressure can be generated in the negative pressure passage 19, so that small stone fragments, blood clots and tissue fragments can be sucked from the distal end 15. For larger stones, the distal end 15 can be used to adsorb the stones by negative pressure, so that the stones can be dragged out or moved to a suitable position. The transition part 13 can also support the inner wall of the negative pressure passage 19 to some extent, reducing the possibility of collapse under negative pressure. Figure 3

[0117] ​The distal end 15 is provided with a water passing groove 12 on the inner wall near the end face in the circumferential direction. The width and depth of the water passing groove 12 can be between 0.05-0.2mm. When the water flow is attracted by the negative pressure, the water flow slows down at the water passing groove 12, and the pressure at this position is greater than that at the front and rear positions in the radial direction, so that the distal end 15 can more tightly suck the stones.

[0118] The distal end 15 is provided with a water passing groove 12 on the inner wall near the end face in the circumferential direction. The width and depth of the water passing groove 12 can be between 0.05-0.2mm. When the water flow is attracted by the negative pressure, the water flow slows down at the water passing groove 12, and the pressure at this position is greater than that at the front and rear positions in the radial direction, so that the distal end 15 can more tightly suck the stones.

[0119] As shown in Figure 1 , Figure 2 and Figure 4 , a thickened sealing ring 17 can be provided near the proximal end 18 in the circumferential direction to better combine with the endoscope tip. The thickened sealing ring 17 can be a thickened support to better hold the endoscope tip inserted into the inferior vena cava. When provided on the inner wall near the proximal end, it is a portion extending from the proximal end to the distal end, and the inner diameter of this portion is smaller than the inner diameter of the inferior vena cava; when provided on the outer wall near the proximal end, it is a portion extending from the proximal end to the distal end on the outer wall, and the outer diameter of this portion is greater than the outer diameter of the proximal end portion. The thickened sealing ring 17 is preferably an elastic reinforced portion, and the length in the axial direction can be 0.5-8mm, and the wall thickness in the radial direction can be increased by 0.1-0.8mm inward or outward. Generally, the endoscope tip of a soft endoscope is located at the most front end of the endoscope insertion end, and the diameter of the tip is slightly larger than that of the insertion section connected thereto. After the endoscope tip is inserted into the inferior vena cava 192, the thickened sealing ring 17 near the proximal end 18 of the capture basket of the present application is tightly attached to the insertion section connected to the tip in the axial direction, so as to more stably hold the tip by using the stronger elasticity.

[0120] For easy installation of the device 10 to the endoscope tip, the negative pressure capture basket 10 can be folded inwards and outwards at the portion near the proximal end 18, and fitted over the remaining portion. In an alternative, the outer wall of the negative pressure capture basket 10 is provided with a weakened area 16, which can be, for example, a bending groove. The weakened area 16 is designed to extend in the circumferential direction in the form of a ring, and the bending resistance at this portion is smaller than that at other portions, for example, the wall thickness at this portion is slightly thinner than that at other portions, so that the portion between the weakened area 16 and the proximal end 18 can be folded inwards and outwards, and uniformly fitted over the portion between the weakened area 16 and the distal end 15, and the weakened area 16 is just the bending location. In an alternative, the portion between the weakened area 16 and the proximal end 18 is a folding portion 21, and the axial length of the folding portion 21 is less than or equal to the distance between the weakened area 16 and the distal end 15. In a specific operation, the folding portion 21 is first folded to be fitted over the portion between the weakened area 16 and the distal end 15, then the endoscope tip is arranged coaxially with the negative pressure capture basket and close to the weakened area 16, and then the folding portion 21 is folded back again so that the portion between the weakened area 16 and the proximal end 18 can be fitted over the tip.

[0121] For the convenience of fitting the negative pressure capture basket of the utility model to the endoscope tip, the utility model also designs an auxiliary device, namely a placing device. In an embodiment of the utility model, as shown in Figure 5 and Figure 6 , the auxiliary device 100 includes two coaxially aligned upper and lower portions, an upper cover 41 and a lower cover 51, which can be detachably combined together, for example, through threads (not shown in the figure). The lower cover 51 has a coaxial protruding portion 53, and the outer diameter of the protruding portion 53 should be smaller than that of the lower cover 51. Both the lower cover 51 and the protruding portion 53 define a hollow portion extending in the axial direction and communicating with each other, and the inner diameters of the hollow portions of the two can be the same or different. One end of the protruding portion 53 in the axial direction is connected to the main body portion of the lower cover 51, and the other end is connected to the basket folding plate 52. The basket folding plate 52 is located at the front end of the protruding portion 53 and extends in the axial direction. In a specific embodiment, the basket folding plate 52 is discontinuous in the circumferential direction and can be composed of several portions with equal arc length. The basket folding plate 52 defines a hollow portion, which is continuous with the hollow portion of the protruding portion 53 in the inner wall, and the inner diameters of the hollow portions of the two are matched with the outer diameter of the negative pressure capture basket 10, so that the negative pressure capture basket can be inserted therein.

[0122] As shown in Figure 7 , Figure 8 , Figure 9 , Figure 10The guide portion 30 is shown. The guide portion 30 includes a guide rod 32, the rear end of which is connected to a positioning seat 33, the rear end of which has an opening 34 with internal threads. The front end of the guide rod 32 is a tip insertion head 31, which can be a tapered head with a gradually decreasing outer diameter in the forward direction, thereby facilitating insertion into the working channel of the endoscope tip. The guide rod 32 extends in the axial direction within the inner wall space defined by the lower cover 51 and the protruding portion 53 tip insertion head. In one embodiment, the tip insertion head 31 can extend beyond the basket folding plate 52 in the axial direction. The guide portion 30 also includes a knob 35 and a threaded extension 36 connected thereto, which can be threadedly coupled to the opening 34 of the positioning seat 33.

[0123] As shown in Figure 10 and Figure 11 The upper cover 41 is provided with a positioning groove 42 in the radial direction. The positioning seat 33 is arranged on the side of the positioning groove 42 close to the front end, and the size of the positioning seat 33 is greater than the width of the positioning groove 42. The width of the positioning groove 42 refers to the size in the direction perpendicular to the radial direction of extension. The rear part of the positioning seat 33 has an opening 34 with internal threads on its inner wall. The knob 35 is larger in size than the width of the positioning groove 42 and is located on the other side of the positioning groove 42 close to the rear end. The knob 35 has a threaded extension 36 that can pass through the positioning groove 42 and be screwed into the internal threads of the opening 34, thereby fixing the positioning seat 33 together with the guide rod 32 and the tip insertion head 31 at a certain point in the radial direction of the positioning groove 42.

[0124] As shown in Figure 12 and Figure 13 When using the negative pressure capture basket 10, the negative pressure capture basket 10 can be coaxially arranged with the protruding portion 53, and then the distal end of the negative pressure capture basket 10 is inserted into the internal space defined by the protruding portion 53 and the basket folding plate 52, while the tip insertion head 31 and the guide rod 32 are also inserted into the negative pressure channel 19 of the negative pressure capture basket 10, and the tip insertion head 31 should be close to the position of the proximal end 18 of the negative pressure capture basket 10 or extend beyond the proximal end 18 of the negative pressure capture basket 10.

[0125] As shown in Figure 14As shown, the endoscope tip 60 of the endoscope insertion end 61 is set coaxial with the protruding portion 53, the position of the guide rod 32 in the radial direction is adjusted along the positioning groove 42, so that the guide rod 32 is coaxial with the working channel of the endoscope, the endoscope tip 60 is pushed forward into the proximal end 18 of the negative pressure capture basket, and the tip insertion head 31 is immediately followed by the guide rod 32 into the working channel of the endoscope tip 60, the endoscope tip 60 is continuously pushed into the negative pressure capture basket until a suitable position, for example, to the transition portion 13 between the superior vena cava 191 and the inferior vena cava 192, so that the entire inferior vena cava 192 (not indicated) contains the endoscope tip 60. In this way, the present application utilizes the guide rod 32 to guide the insertion of the endoscope tip into the negative pressure capture basket. At the same time, the positioning groove 42 can make the guide rod 32 more easily adjusted and inserted into the eccentrically designed working channel, so that the auxiliary device can be used with a variety of endoscope tips.

[0126] As shown in the drawings, Figure 15 In an embodiment of the present application, in order to more conveniently install the negative pressure capture basket to the endoscope tip, it is considered that the proximal end of the negative pressure capture basket is designed to be folded inwardly and outwardly, so that when the endoscope tip enters the negative pressure capture basket, the folded portion 21 can be folded back to fit on the endoscope tip. The folded portion 21 near the proximal end 18 of the negative pressure capture basket is pre-folded inwardly and outwardly, evenly fitted on the other part of the negative pressure capture basket or the mesh basket folding plate 52, at this time the tip insertion head 31 is exposed outside the negative pressure capture basket, the endoscope tip is set coaxial with the protruding portion 53, and the tip insertion head 31 is inserted into the working channel of the endoscope tip until it contacts the negative pressure capture basket, at this time the entire auxiliary device is pushed in the axial direction, the mesh basket folding plate 52 pushes the folded portion 21 of the negative pressure capture basket, so that the folded portion 21 folded on the mesh basket folding plate 52 gradually restores to its original state, thereby gradually fitting on the endoscope tip.

[0127] In order to facilitate folding, as shown in the drawings, Figure 1 and Figure 2 A weak area 16 can be provided on the outer wall of the negative pressure capture basket, which can be an annular groove formed on the outer wall, that is, the wall thickness at this position is thinner, so that the folded portion 21 from the proximal end 18 to the weak area 16 can be more easily folded inwardly and outwardly at the weak area 16. In an embodiment, the distance from the weak area 16 to the proximal end 18 is equal to or less than the distance from the weak area 16 to the distal end 15.

[0128] As shown in the drawings, Figure 16 , Figure 17 and Figure 18In order to better and more efficiently capture stones and debris of certain size, for example, 0.5-4 mm in diameter, a sieve plate 71 can be provided between the upper chamber 191 and the lower chamber 192. For example, it can be provided in place of the transition portion 13. In one embodiment, the sieve plate 71 is located about 0.1-3 mm from the endoscope tip. The sieve plate 71 can intercept stones and debris of certain size and can also serve as a support. The sieve plate 71 is a perforated plate having a plurality of holes 72 provided thereon. The holes can be of different sizes or of the same size, depending on the size of the particles to be intercepted. The holes can be uniformly distributed, and a hole 73 can be provided at the position of the working channel of the endoscope tip, which can be of the same size as the inner diameter of the working channel. The thickness of the sieve plate can be selected according to the specific application scenario and can generally be between 0.1-1 mm. The sieve plate can be made of any suitable material, and in one embodiment, it can be made of transparent material, such as resin or plastic.

[0129] The material of the negative pressure capturing basket can be selected from elastic materials, such as silicone or plastic, particularly for the proximal and distal portions. In one embodiment, the distal portion of the negative pressure capturing basket is designed in the shape of a trumpet, which can prevent the tube wall from collapsing inward during negative pressure suction. In one embodiment, the wall material of the upper chamber of the negative pressure capturing basket is thinner and softer than that of the lower chamber, particularly the material at the trumpet portion needs to be thinner and softer, so as to be more easily attached to the surface of the stone. In addition, when a slightly larger stone is suctioned, the distal portion can be slightly deformed, thereby increasing the contact area with the stone and more firmly suctioning the stone. The proximal portion needs to be matched with the size of the endoscope tip, for example, by interference fit, so as to achieve air tightness. Figure 25 Another embodiment is shown in which the axis A of the distal opening of the upper chamber 191 (i.e., the center line perpendicular to the distal end 15) does not coincide with the axis B of the lower chamber 192. For example, the upper chamber and the lower chamber of the negative pressure capturing basket are not coaxial, i.e., if the center axis A of the upper chamber 191 coincides with the center axis B of the lower chamber 192, the angle is set to 0, when they do not coincide, the two axes can form an angle, for example, as shown in the α angle in Figure 25 The angle can be between 10°-60°. The upper chamber can be pre-bent, or placed in a pre-bent lining body, or intentionally bent, for example, by a supporting spring. In this way, the distal opening of the negative pressure capturing basket does not face the distal direction of the axial direction of the tip head directly, but is biased to one side. This is beneficial for attaching to stones with complex surface shapes and stones not located on the axial extension line of the tip head.

[0130] In one embodiment, the material of the negative pressure capturing basket can be selected from transparent elastic materials, such as silicone, so that during the operation, illumination and observation can be performed through the side wall, which is more beneficial for suctioning, suctioning and moving stones and other debris.

[0131] To enhance support for the sidewalls of the negative pressure capture basket, reinforcing sections can be incorporated into its inner wall. These can be multiple reinforcing ribs arranged circumferentially, or they can be transparent rigid tubes or elastic rings, such as springs. The reinforcing sections should primarily be positioned in the upper cavity of the basket along the axial direction. The absence of support in the lower cavity allows for bending of the distal portion of the basket, facilitating stone alignment.

[0132] Figure 19 , Figure 20 , Figure 21 and Figure 22 This illustrates another embodiment of the device of the present invention. The device includes an upper cover 41 and a lower cover 51. The interior of the upper cover 41 has radially arranged... Figure 11 Positioning slot 42 and such Figure 10 The positioning seat 33 and the knob 35 having an extension 36 with external threads. The guide rod 32 is similarly connected to the positioning seat 33 by threads, so that the guide rod can be positioned at a point in the radial direction.

[0133] Unlike other designs, the portion where the upper cover 41 and the lower cover 51 engage is a sliding engagement, meaning the lower cover 51 can move axially relative to the upper cover 41 and the guide rod 32. In one embodiment, the upper cover 41 has two sets of guide plates 431 and 432 facing each other on the inner wall of the portion engaging with the lower cover 51, extending simultaneously in both the axial and radial directions. The guide plates 431 and 432 should extend axially to the end face 44 where they begin to engage with the lower cover 51. The guide plate 431 includes two adjacent sub-plates 431a and 431b, which define a guide space 431A; the guide plate 432 includes two adjacent sub-plates 432a and 432b, which define a guide space 432A.

[0134] The lower cover 51 has a base 54 that is substantially perpendicular to the axial direction. A circular hole 55 is provided near the center of this base for the guide rod 32 to pass through. On the side of the base 54 facing the upper cover, guide strips 56 and 57 extending in the axial and radial directions are arranged opposite each other. When the upper cover 41 and lower cover 51 are coaxially arranged and move closer to each other, the guide strips 56 and 57 can be inserted into the guide spaces 431A and 432A of the upper cover 41, respectively, thereby stabilizing and guiding the relative axial displacement between the upper cover 41 and lower cover 51. In another embodiment of this invention, one or more protrusions 561 and 571 can be further provided on both sides of the guide strips 56 and 57, such as the two protrusions shown in the figure. When inserted into the guide spaces 431A and 432A, the protrusions on both sides can slide in contact with each sub-plate, thereby reducing sliding resistance.

[0135] In a specific use, the upper cover 41 and the lower cover 51 are first relatively slidably connected together, then the negative pressure capturing basket is folded on the net basket folding plate 52 of the lower cover 51, then the guide rod 32 is radially positioned, then the endoscope tip is coaxially close to the guide rod 32, the guide rod 32 is inserted into the tip working channel, according to the guide of the guide rod 32, the tip enters the lower cavity 192 of the negative pressure capturing basket, then the lower cover 51 is moved relative to the upper cover 41 in the axial direction to the opposite separation direction, so that the end surface 52A at the farthest end of the net basket folding plate 52 or the outer side boss 52B connected with the protruding part 53 of the net basket folding plate 52 will gradually push the folded part of the negative pressure capturing basket to be folded back on the tip, and the installation of the negative pressure capturing basket on the tip is completed.

[0136] In another embodiment of the present application, a similar design is adopted, the guide strip can be arranged in the upper cover 41, and the guide plate can be arranged in the lower cover 51.

[0137] In another embodiment of the present application, the diameter of the guide rod 32 between the front end and the rear end is not consistent, and the diameter uniformly or stepwise increases from the front end to the rear end, so that after the tip insertion head 31 enters the tip working channel by a certain distance, the diameter of the guide rod 32 will be larger than the inner mirror of the working channel, so as to prevent the guide rod 32 from being further inserted into the working channel, which can better limit the axial position of the tip inserted into the negative pressure capturing basket. For example, the insertion distance can be equal to the axial length of the upper cavity 191 of the negative pressure capturing basket. In one embodiment, a step 321 is arranged between the front end and the rear end of the guide rod 32, and the diameter of the front end to the step 321 is smaller than the diameter of the step 321 to the rear end, so that the step 321 will contact the distal end surface of the tip to prevent the guide rod 32 from being further inserted into the working channel.

[0138] In another embodiment of the present application, a clamping protrusion 431B is arranged on the inner wall between the two sub-plates 431a and 431b, and a clamping protrusion 432B is arranged between the two sub-plates 432a and 432b. The extension length of the clamping protrusions in the radial direction should be smaller than the extension length of the adjacent two sub-plates, and in the axial direction, the clamping protrusions should be closer to the end surface 44 and be provided with inclined surfaces 431C and 432C between the clamping protrusions and the end surface 44. Meanwhile, cantilever arms 562 and 572 are arranged on the guiding strips 56 and 57 of the lower cover 51 and first engage one end of the upper cover 41. The cantilever arms 562 and 572 are elastic and can be deformed / moved in the axial direction when subjected to pressure, and return to the original position after the pressure is removed. Thus, when the upper cover 41 and the lower cover 51 are engaged with each other, the cantilever arms 562 and 572 move along the inclined surfaces 431C and 432C and are deformed through the clamping protrusions 431B and 432B, respectively, so as to complete the engagement between the upper cover and the lower cover. When the upper cover and the lower cover are moved in the separation direction, the cantilever arms 562 and 572 can be clamped by the clamping protrusions 431B and 432B and cannot pass through, so as to limit the relative displacement distance between the upper and lower covers, facilitating the operation.

[0139] In the above embodiment, the guiding plates and the guiding strips are both two groups and are arranged at an angle of 180 degrees with respect to the circumference. Other arrangement modes can also be considered, for example, more groups of design schemes, such as three groups arranged at an angle of 120 degrees with respect to the circumference, or four groups arranged at an angle of 90 degrees with respect to the circumference, etc. In addition, a cylinder 58 is arranged on the bottom disc 54 at a position closer to the axis with respect to the guiding strips and is arranged along the circumference. The cylinder 58 extends in the axial direction and is fixedly connected with the guiding strips, so as to enhance the support for the guiding strips. The internal space of the cylinder 58 is communicated with the internal space of the protruding portion 53 and can allow the guiding rod 32 to pass through.

[0140] Figure 26 Another embodiment of the negative pressure capturing basket of the present application is shown, that is, the distal end is separated from the sieve plate by a distance. Considering that the upper cavity contains the stone debris 81 and blocks the field of view of the surrounding tissue, the end surface of the distal end 60 can be separated from the sieve plate 71 by a distance d. The distance is related to the field of view angle, diameter, position on the end surface of the endoscope camera lens, and the diameter of the inner wall of the negative pressure capturing basket. As shown in the figure, when the distal end 60 is inserted into the transition portion 13, the field of view range of the camera lens is the area between XL and XR. In the figure, the right field of view is blocked because XR is close to the edge of the sieve plate 71 (and the stone debris 81). The area b between the left field of view line XL and XM (the line connecting the lens and the left edge of the sieve plate) is the range of the tissue that can be observed. Of course, the observable field of view is actually an eccentric annular ring, in which the left field of view has the maximum width and the right field of view has zero width. Figure 26

[0141] ​Figure 27 The figure shows another embodiment of the utility model, and shows that the tip head is combined with the negative pressure capturing basket of the utility model and is placed in the human tissue together. The sieve plate 71 is in the shape of protruding towards the proximal end, the distance between the tip head 60 and the nearest end of the protruding shape is d, the field of view of the camera lens of the tip head 60, that is, the area between YL and YR, because the sieve plate 71 contains the stone debris 81, so the field of view is the area m between YL and ZL (the connecting line between the lens and the left edge of the sieve plate) and the area n between YR and ZR (the connecting line between the lens and the right edge of the sieve plate). The protruding shape of the sieve plate 71 can be just arranged between ZL and ZR, and the sieve plate in this shape can contain more stone debris without additional blocking the field of view.

[0142] In the case that the tip head is separated from the sieve plate by a distance, the end surface position of the tip head can be the transition part 13 of the negative pressure capturing basket, so that the position of the tip head can be better positioned, and the preset distance d between the tip head and the sieve plate can be ensured. The preset distance d can generally be 1-10 mm, for example, 3-6 mm. In this way, the tissue condition can be observed during the stone extraction process, and the visualization of the lens pushing process can also be realized.

[0143] In an optional solution, the inner wall of the negative pressure channel can be provided with enhanced support to prevent the collapse of the inner wall under negative pressure, for example, reinforcing ribs arranged in the radial direction. The reinforcing ribs can be springs, which can be made of metal and are attached to the inner wall of the negative pressure channel, embedded therein, or completely wrapped by the side wall of the negative pressure capturing basket. In an optional solution, the enhanced support arranged in the axial direction can be located at a position close to the middle of the negative pressure capturing basket in the axial direction, and there is no such enhanced support at positions close to the proximal end and the distal end. Such a design can facilitate the insertion of the endoscope tip head into the capturing basket channel, and also facilitate the deformation of the distal end of the capturing basket when the stone is sucked under negative pressure, so as to increase the area of contact with the stone. For example, as shown in the figure, the negative pressure capturing basket has an upper cavity 191 and a lower cavity 192. The spring 193 is arranged in the part of the inner wall of the lower cavity 192 close to the upper cavity 191, and the spring 193 extends in the axial direction. There is no spring at the part of the inner wall of the upper cavity 191 and the lower cavity 192 close to the proximal end, including the corresponding inner wall of the folding part 21 and the weak area 16. Figure 28

[0144] The utility model directly installs the negative pressure capturing basket of the endoscope tip head to perform negative pressure suction / adsorption operation, and has the following technical advantages compared with the traditional stone capturing basket composed of metal filaments alone:

[0145]

[0146] ​​(1) Reduced operational difficulty. Compared to traditional stone capture baskets, negative pressure capture baskets are much easier to operate. Under visualization, we only need to attach the distal end of the capture basket to the stone surface. After simple training, one can quickly get started with practical operation, requiring very little technical skill from the doctor.

[0147] (2) Wider applicability. The channel in the middle of the negative pressure capture basket can be pre-installed with a guide wire or optical fiber, or installed during surgery, depending on the situation. During fiber optic lithotripsy, stone removal, etc., the negative pressure capture basket, made of highly transparent silicone, will not affect the field of vision. It will also not significantly interfere with other surgical procedures.

[0148] (3) Low production cost. The negative pressure capture basket is injection molded from high-transparency silicone. Compared with traditional stone capture baskets, the negative pressure capture basket of this invention can achieve a lower manufacturing cost, thereby reducing the procurement pressure on hospitals and the medical costs for patients.

[0149] (4) Applicable to removing stones and debris of various sizes. Smaller debris can generally be directly aspirated through the sieve plate and the working channel of the endoscope. Slightly larger debris can accumulate between the sieve plate and the distal end of the negative pressure capture basket, and can be removed in one go by withdrawing it towards the proximal end. Larger stones, such as those larger than 4 mm, can be moved to a suitable position by being sucked onto their surface by the negative pressure capture basket for further processing.

[0150] (5) It can remove blood clots. Blood clots easily adhere to the surface of mucous membranes, and are difficult to remove with traditional stone retrieval baskets. They are not easy to rinse off and can easily cause infection. However, the negative pressure capture basket of this utility model can scrape off blood clots and is suitable for removing blood clots by negative pressure.

[0151] (6) The negative pressure capture basket of this invention also has great advantages over the negative pressure sheath. The negative pressure capture basket of this invention can get close to certain areas inside the kidney, such as the renal pelvis or renal calyx, while the negative pressure sheath cannot; the negative pressure capture basket of this invention can be flexibly tilted together with the endoscope, while the negative pressure sheath generally has a smaller bending angle.

[0152] The "proximal end" refers to the end closer to the operator during operation, while the "distal end" refers to the end closer to the patient or experimental tissue. The "axial direction" refers to the direction of the line between one end of a substantially elongated object to the other end, such as the direction of the line between the "proximal end" and the "distal end". When the cross section of such an object is circular, the direction of the line is the center of the circle. The "radial direction" or "radial" refers to the direction along the radius / diameter of the circle when the cross section perpendicular to the axial direction is circular. The "circumferential direction" refers to the direction of the circumference of the circle when the cross section perpendicular to the axial direction is circular. The "minor arc" refers to the arc of the circumference direction, and its length is less than half of the circumference. "Left" and "right" are understood according to the relative positions in the figure.

[0153] Those skilled in the art will appreciate that modifications (additions and / or removals) of various components / elements of the products, formulations, devices, methods, systems and implementations described herein can be made, without departing from the full and fair scope and spirit of the present inventive subject matter.

Claims

1. A stone capturing device, which is an elongated structure and can be used in cooperation with an endoscope, characterized in that comprising a proximal end, a distal end, and a negative pressure channel having openings at both the proximal end and the distal end and extending therebetween, and the proximal end can be connected airtightly and detachably with an endoscope tip, so that the working channel of the endoscope can be communicated with the negative pressure channel.

2. The stone capture device of claim 1, wherein the negative pressure channel comprises an upper cavity near the distal end and a lower cavity near the proximal end, wherein the upper cavity has a portion with gradually increasing inner diameter in the distal direction at the opening of the distal end.

3. The stone capture device of claim 2, wherein the lower cavity of the device can accommodate the endoscope tip, wherein the inner surface of the lower cavity and the outer surface of the endoscope tip are airtightly matched.

4. The stone capture device of claim 3, wherein the upper cavity is non-coaxial with the lower cavity, and the angle between the axis of the distal end opening of the upper cavity and the axis of the lower cavity is 10-60 degrees.

5. The stone capture device of claim 3, wherein the wall of the upper cavity is thinner and softer than the wall of the lower cavity.

6. The stone capture device of claim 3, wherein there is a transition portion between the upper cavity and the lower cavity, and the cross-sectional area of the negative pressure channel of the transition portion is smaller than that of the lower cavity.

7. The stone capture device of claim 6, wherein the transition portion is composed of two positioning portions, which are oppositely arranged in the radial direction, each connected to the minor arc of the inner wall circumference of the transition portion and together defining a gap therebetween, wherein when the lower cavity of the capturing device is sleeved into the endoscope tip, the two positioning portions can block part of the end surface of the endoscope tip to limit the further movement of the endoscope tip in the distal direction, and the gap between the two positioning portions can expose the working channel, lens and illuminating lamp on the endoscope tip.

8. The stone capture device of claim 1, wherein the stone capturing device has an outer wall, and an annular weak area is arranged on the outer wall, and the bending resistance at the weak area is smaller than that of other parts of the outer wall of the stone capturing device.

9. The stone capture device of claim 1, wherein the negative pressure channel can be provided with radial reinforcing support.

10. The stone capture device of claim 1, wherein the proximal end portion is made of elastic material and can be folded outwardly from inside to cover the rest of the device; the distal end portion is made of elastic material and is transparent.

11. The stone capture device of claim 2, wherein it is characterized by a sieve plate is arranged between the upper cavity and the lower cavity.

12. The stone capture device of claim 11, wherein the sieve plate is 1-10 mm away from the endoscope tip.

13. An auxiliary device by which the stone capturing device according to any one of claims 1 to 12 can be attached to the tip of an endoscope, characterized by comprising a main portion, a protruding portion, one end of which is connected to the main portion, the protruding portion further defining a hollow portion extending in the axial direction, the inner diameter of the hollow portion being matched with the outer diameter of the capturing device, the capturing device being inserted into the hollow portion, and the hollow portion being coaxial with the capturing device; and a guide rod comprising a front end and a rear end, the rear end of the guide rod being connected to the main portion, the rest of the guide rod being located in the hollow portion and extending in the axial direction, wherein the front end of the guide rod can be inserted into the working channel of the endoscope.

14. The supplemental device of claim 13, wherein when the capturing device is located in the hollow portion, the guide rod is inserted into the negative pressure channel of the capturing device.

15. The supplemental device of claim 13, wherein the negative pressure channel of the stone capturing device comprises an upper cavity near the distal end and a lower cavity near the proximal end, wherein the upper cavity has a portion with gradually increasing inner diameter in the distal direction at the opening of the distal end and the lower cavity can accommodate the endoscope tip, and when the stone capturing device is located in the hollow portion of the auxiliary device and the endoscope tip is located in the lower cavity of the stone capturing device, the guide rod is inserted into the working channel of the endoscope tip.

16. The supplemental device of claim 13, wherein The diameter of the guide rod is uniform or stepped from the front end to the rear end, so that the guide rod can be prevented from being inserted further after being inserted into the working channel of the endoscope by a certain distance.

17. The supplemental device of claim 13, wherein The stone capturing device has an outer wall, and an annular weak area is arranged on the outer wall, the bending resistance at the weak area is relatively smaller than that of other parts of the outer wall of the stone capturing device, and the stone capturing device has a folding part, which is a part of the stone capturing device from the proximal end to the weak area.

18. The supplemental device of claim 17, wherein The basket folding plate is located at the front end of the protruding part and extends in the axial direction, and is discontinuous in the circumferential direction and can be composed of several parts with equal arc lengths, and the basket folding plate defines a hollow part that is continuous with the hollow part of the protruding part in the inner wall, and the guide rod also extends in the axial direction in the hollow part defined by the basket folding plate, and the folding part of the proximal end of the stone capturing device can be folded outward from the inside and sleeved on the basket folding plate.

19. The supplemental device of claim 13, wherein The positioning seat is connected to the rear end of the guide rod, and the positioning seat can move in the radial direction to drive the front end of the guide rod to move in the radial direction.

20. The supplemental device of claim 19, wherein The main body part includes an upper cover and a lower cover, the upper cover and the lower cover are coaxial with the hollow part of the protruding part, and the upper cover and the lower cover can be combined together in the axial direction, and the lower cover is connected to the protruding part; the upper cover is provided with a positioning groove extending in the radial direction, and the positioning seat can move in the positioning groove.

21. The supplemental device of claim 20, wherein The base is located at the rear end of the positioning seat and has an internal thread, and the outer diameter of the base is greater than the width of the positioning groove; the front end of the knob has an elongated part with an external thread, the elongated part of the knob can pass through the positioning groove and be inserted into the internal thread of the base, and the internal thread and the external thread are matched and screwed to fix the positioning seat at a certain position in the radial direction.

22. The auxiliary device according to claim 20, characterized in that Two or more sets of guide plates are arranged on the inner wall of the upper cover, each guide plate is composed of two adjacent sub-plates, the guide plates extend in the axial and radial directions and define a guide space between the two sub-plates, and the lower cover is provided with a guide strip, when the upper cover and the lower cover are close to each other, the guide strip can slide into the guide plates, so that the upper cover and the lower cover can be slidably combined and relatively moved in the axial direction.

23. The supplemental device of claim 22, wherein The guide strip is provided with a cantilever at one end of the guide strip which first engages the upper cover in the axial direction, and the cantilever has elasticity which can be deformed in the radial direction; a clamping protrusion is arranged between the two plates of the guide plate and close to the inner wall of the upper cover, and the cantilever can be deformed to pass through the clamping protrusion when the guide strip enters the guide space.

24. The supplemental device of claim 20, wherein The upper cover and the lower cover are combined together by threads.

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