A bile duct stone removal device

Abstract

The present application discloses a bile duct stone removal device, including a sheath and a net basket, wherein a guide head is provided at the end of the net basket, and further comprising a connecting component fixed on the guide head and a guide ring sleeved on the connecting component and through which a guide wire can pass, wherein the guide ring is hinged to the connecting component. The bile duct stone removal device provided by the present application limits the guide ring on the guide head through the setting of the connecting component, and the guide ring is hinged to the connecting component, which can ensure that the guide ring can swing flexibly, so that the cooperation between the guide ring and the guide wire is smoother, and the net basket can be smoothly pushed into the common bile duct.

Description

Technical Field

[0001] The present application relates to the field of stone removal devices, and in particular to a biliary stone removal device. Background Art

[0002] The treatment method of common bile duct stones using duodenoscope has been purchased by more and more hospitals. For stones with a diameter of less than 10mm, a basket is often used for stone removal. For stones with a diameter of more than 10mm, a lithotripsy basket is often used for mechanical lithotripsy, and then a stone removal basket or balloon is used for stone removal. When intubation is difficult, the doctor will use a guide wire to assist in successfully inserting the basket into the common bile duct.

[0003] At present, due to the complex structure of the bile duct, the small diameter, softness and toughness of the guidewire, and its excellent pushing performance, during the ERCP procedure, a guidewire is often inserted into the common bile duct in advance, and then the basket is guided into the common bile duct through the guiding effect of the guidewire.

[0004] In the prior art, a guidewire structure is generally designed at one end of the outer side of the sheath at the front end of the basket, where the guidewire structure is a structure for the guidewire to pass through. Alternatively, a 2-lumen or 3-lumen sheath is used on the sheath at the front end of the basket, and the guidewire passes through an independent lumen of the sheath; or a section of plastic hose is glued to the end of the guide head of the metal head of the basket.

[0005] However, the solutions in the above prior art design a guidewire structure on the outside of the sheath, which will make the front end of the sheath thicker and harder. When the endoscope is bent at a large angle, the passability of the basket through the internal cavity of the endoscope body is poor; the sheath at the front end of the basket adopts a 2-lumen or 3-lumen sheath solution, which has difficult sheath processing technology and high cost; and the solution of gluing a section of plastic hose to the metal head end of the basket, because the hose is relatively thin or the bonding strength is insufficient, the hose will be cut by the guide wire or fall out of the metal head end during the process of pushing the basket along the guide wire.

[0006] Therefore, how to improve the pushing stability of the basket is a technical problem that technical personnel in this field currently need to solve.

[0007] Application Contents

[0008] The purpose of the present application is to provide a biliary stone removal device, which is used to ensure that the basket is smoothly pushed into the common bile duct, with smooth guidance and low cost.

[0009] To achieve the above objectives, this application provides the following technical solutions:

[0010] A bile duct stone removal device comprises a sheath and a net basket, wherein a guide head is provided at the end of the net basket, and further comprises a connecting component fixed on the guide head and a guide ring sleeved on the connecting component and through which a guide wire can pass, wherein the guide ring is hinged to the connecting component.

[0011] Preferably, the connecting component is provided with a limiting portion for limiting the movement limit position of the guide ring.

[0012] Preferably, the corners of the limiting portion are provided with arc chamfers.

[0013] Preferably, the connection component is formed by cutting to form the limiting portion, or the connection component is formed by metal injection molding to form the limiting portion.

[0014] Preferably, the connecting component and the guide head are connected by welding, snap-fitting or threading.

[0015] Preferably, the basket comprises a basket body and a cable, the guide head is located at an end of the basket body away from the cable, the cable runs through the inside of the sheath, and the cable can pull the basket body into or out of the sheath.

[0016] Preferably, the basket is a stone retrieval basket, a stone crushing basket, or an integrated stone retrieval and stone crushing basket.

[0017] Preferably, the basket comprises a basket body; the steel wires of the basket body may be curved, angular or spiral in shape after being unfolded, and the number of steel wires of the basket body is 4, 5, 6 or 8.

[0018] Preferably, the end surface of the connecting component away from the guide head is an arcuate surface, the arcuate surface is a cylindrical surface or a spherical surface, the connecting component is provided with a hollow part, and the guide ring is sleeved in the hollow part.

[0019] Preferably, the guide ring is in a circular or elliptical shape, so that it can pass through the hollow portion of the connecting component and can swing freely along the hollow portion, and the cross-section of the guide ring along its circumference is circular or elliptical.

[0020] Preferably, the hollow portion is sleeved with the guide ring, and the surface where the hollow portion and the guide ring are sleeved is a smooth curved surface.

[0021] The bile duct stone removal device provided by the present application includes a sheath and a mesh basket, wherein a guide head is provided at the end of the mesh basket, and further includes a connecting component fixed on the guide head and a guide ring sleeved on the connecting component and through which a guide wire can pass, wherein the guide ring is hinged to the connecting component. The bile duct stone removal device provided by the present application limits the guide ring on the guide head through the provision of the connecting component, and the guide ring is hinged to the connecting component, which can ensure that the guide ring can swing flexibly, so that the cooperation between the guide ring and the guide wire is smoother, and the angle between the connecting component and the guide ring can be freely adjusted, thereby adjusting the pushing direction, ensuring that the mesh basket is smoothly pushed into the common bile duct, and the connecting component is firmly and reliably connected to the metal guide head of the mesh basket, avoiding the risk of the guide ring falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1-A A schematic structural diagram of a specific implementation of the basket in the bile duct stone removal device provided in the present application;

[0024] Figure 1-B A schematic structural diagram of another specific implementation of the basket in the bile duct stone removal device provided in the present application;

[0025] Figure 2 A structural schematic diagram of a specific implementation of a connecting component in the bile duct stone removal device provided in the present application;

[0026] Figure 3 A schematic structural diagram of another specific implementation of the connecting component in the bile duct stone removal device provided in the present application;

[0027] Figure 4 A schematic diagram of the position structure of the guide wire and the common bile duct in the biliary stone removal device provided in this application;

[0028] Figure 5 A schematic diagram of the coordination structure of the guide ring and the guide wire in the bile duct stone removal device provided in the present application;

[0029] Figure 6 A schematic diagram of the structure of the bile duct stone removal device provided in this application when the basket body is opened;

[0030] Wherein: sheath (1), basket (2), guide head (2-1), basket body (2-2), cable (2-3), connecting component (3), limiting part (3-1), guide ring (4), guide wire (5), bile duct stone (6), common bile duct (7), duodenum (8), duodenoscope (9). DETAILED DESCRIPTION

[0031] The core of the present application is to provide a biliary stone removal device. By setting a guide ring and a connecting component, the flexibility of the guide ring can be effectively improved, the guide ring is not easy to fall off, and the coordination between the guide ring and the guide wire is smoother.

[0032] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Please refer to Figures 1 to Figure 6 , Figure 1-A A schematic structural diagram of a specific implementation of the basket in the bile duct stone removal device provided in the present application; Figure 1-B A schematic structural diagram of another specific implementation of the basket in the bile duct stone removal device provided in the present application; Figure 2 A structural schematic diagram of a specific implementation of a connecting component in the bile duct stone removal device provided in the present application; Figure 3 A schematic structural diagram of another specific implementation of the connecting component in the bile duct stone removal device provided in the present application; Figure 4 A schematic diagram of the position structure of the guide wire and the common bile duct in the biliary stone removal device provided in this application; Figure 5 A schematic diagram of the coordination structure of the guide ring and the guide wire in the bile duct stone removal device provided in the present application; Figure 6 This is a schematic diagram of the structure of the bile duct stone removal device provided in this application when the basket body is opened.

[0034] In this embodiment, the biliary stone removal device includes a sheath 1 , a basket 2 , a connecting component 3 and a guide ring 4 .

[0035] The basket 2 includes: a guide head 2-1, a basket body 2-2 and a cable 2-3. The guide head 2-1 is located at one end of the basket body 2-2 away from the cable 2-3. The cable 2-3 runs through the inside of the sheath 1. The cable 2-3 can pull the basket body 2-2 into or out of the sheath 1.

[0036] The guide head 2-1 is arranged at the head end of the net basket 2, and the connecting component 3 is fixed on the guide head 2-1. The connecting component 3 is located at the end of the guide head 2-1 away from the cable 2-3. A hollow part is provided in the middle of the connecting component 3 for the guide ring 4 to be placed in. The guide ring 4 is sleeved in the hollow part of the connecting component 3 and can swing around the connecting component 3. The guide wire 5 can pass through the middle of the guide ring 4 and guide the net basket 2 to be pushed forward along the guide wire 5; the guide head 2-1 is preferably a metal guide head, and is not limited to a plastic guide head or a ceramic guide head.

[0037] The connecting surface between the guide head 2-1 and the connecting component 3 is a plane, which is preferably a circular plane; since welding has high connection strength and the connection is firm and reliable, the connection method between the guide head 2-1 and the connecting component 3 is preferably welding, but the connection method is not limited to welding, threaded connection or snap connection, etc.; the welding method between the connecting component 3 and the guide head 2-1 is not limited to laser welding, brazing or resistance welding, etc.

[0038] The specific assembly and processing method of the connecting component 3 is as follows: a hollow part for placing the guide ring 4 is provided on the connecting component 3. Before the connecting component 3 is fixed on the guide head 2-1, the guide ring 4 is first sleeved on the connecting component 3 so that a certain circumferential position of the guide ring 4 is in the hollow part, and then the connecting component 3 is fixedly connected to the guide head 2-1.

[0039] The biliary stone removal device provided in the present application limits the guide ring 4 on the guide head 2-1 through the setting of the connecting component 3, and the guide ring 4 is hinged to the connecting component 3 to ensure that the guide ring 4 can swing flexibly, so that the cooperation between the guide ring 4 and the guide wire 5 is smoother, and the angle between the connecting component 3 and the guide ring 4 can be freely adjusted to adjust the pushing direction, thereby ensuring that the basket 2 is smoothly pushed into the common bile duct 7, and the connection between the connecting component 3 and the metal guide head 2-1 of the basket 2 is firmly and reliably connected, avoiding the risk of the guide ring 4 falling off.

[0040] In some specific implementation schemes, the connecting component 3 may also be provided with a limiting portion 3-1 for limiting the swing angle limit position of the guide ring 4, such as Figure 3 As shown, near the fixed connection position between the connecting component 3 and the guide head 2-1, a limiting portion 3-1 is provided on both sides of the outer circumference of the annular connecting component 3 as the symmetry axis. When the guide ring 4 swings along the hollow part of the connecting component 3, the limiting portion 3-1 can limit the swing limit angle of the guide ring 4. Specifically, the limiting portion 3-1 abuts against the guide ring 4 to limit the swing limit angle. Therefore, the range of the swing angle can be adjusted by adjusting the setting position and height of the limiting portion 3-1. For example, Figure 2 In the structure shown, when there is no limiter 3-1, the swing angle of the guide ring 4 is 180°. Figure 3In the structure shown, when the limiting portion 3-1 is set, the swing angle of the guide ring 4 is 120-150°. Of course, the setting position and height of the limiting portion 3-1 can be set as needed, and the swing angle range of the guide ring 4 is not limited to the angle range given in this embodiment.

[0041] Furthermore, a sloped surface may be provided on the limit portion 3-1, and the limit portion 3-1 and the guide ring 4 are abutted through the sloped surface, and the surface of the limit portion 3-1 is consistent with the surface shape of the guide ring 4, and the range of the swing angle of the guide ring 4 can be adjusted by adjusting the plane angle between the limit surface and the guide head 2-1; through the sloped surface structure, the surface of the limit portion 3-1 can be more closely fitted with the surface of the guide ring 4, thereby reducing the wear on the guide ring 4.

[0042] Furthermore, one, two, three or four limiting portions 3-1 may be provided near the fixed connection position between the connecting component 3 and the guide head 2-1; arc chamfers may be provided at the corners of the limiting portion 3-1 to improve smoothness and reduce damage to the patient; the limiting portion 3-1 may be an integral structure with the connecting component 3 or a split structure fixedly connected as one.

[0043] On the basis of the above-mentioned embodiments, the end face of the connecting component 3 away from the guide head 2-1 is an arc-shaped surface. By setting the arc-shaped surface, the damage to the patient can be reduced; the arc-shaped surface of the connecting component 3 can be the curved surface of a cylinder, and a hollow part is provided on the connecting component 3, and the hollow part is sleeved with the guide ring 4, and the surface where the hollow part and the guide ring 4 are sleeved is a smooth surface, so that the guide ring 4 can swing freely around the connecting component 3; the arc-shaped surface of the connecting component 3 can also be the curved surface of a sphere, and a hollow part is provided at the center position of the sphere of the connecting component 3, and the guide ring 4 is sleeved in the hollow part of the connecting component 3 and can swing freely around the connecting component 3; The size of the hollow part should be larger than the ring width of the guide ring 4 so that the guide ring 4 can be hung on the connecting component 3. The ring width is the outer diameter of the surface of the guide ring 4 minus the inner diameter of the surface of the guide ring 4. Furthermore, while opening the hollow part, the limiting part 3-1 can also be processed together. The surface of the limiting part 3-1 is preferably an arc-shaped surface, which cooperates with the arc-shaped surface of the guide ring 4 to improve the limiting effect of the limiting part 3-1 on the guide ring 4. The end face where the guide head 2-1 is connected to the connecting component 3 is preferably a circular plane, and the diameter of the circular plane of the connecting component 3 is preferably the same as the outer diameter of the guide head 2-1, so as to facilitate welding connection.

[0044] On the basis of the above-mentioned embodiments, the guide ring 4 may be in a circular shape. The use of a circular guide ring 4 can ensure that the relative angle between the guide ring 4 and the guide wire 5 is automatically adjusted and applicable, and the guidance is smoother. The guide ring 4 may also be circular or elliptical in cross-section along its circumference, so that the guide ring 4 is naturally smooth, the friction between the guide ring 4 and the guide wire 5 is small, and the advancement of the basket 2 is smoother.

[0045] On the basis of the above embodiments, the basket body 2-2 includes a plurality of elastic steel wires. Before the basket body 2-2 is pushed out of the sheath tube 1, it is confined inside the sheath tube 1. When the basket body 2-2 is pushed out of the sheath tube 1, it naturally expands to form a basket shape. Figure 1-A and Figure 1-B As shown, the shape of the steel wires of the basket body 2-2 after unfolding can be curved, angular or spiral, wherein the angular shape is a broken line shape with bent edges. The number of steel wires of the basket body 2-2 is not limited, and can be 4 wires, 5 wires, 6 wires or 8 wires.

[0046] On the basis of the above-mentioned embodiments, the basket 2 provided in this embodiment can be a stone-removing basket, a stone-crushing basket, or an integrated basket for stone-removing and stone-crushing, and can be a disposable basket or a reusable basket. The stone-crushing basket can be matched with a stone-crushing handle, and can be used to crush stones with a diameter of more than 10 mm. After the stones are crushed into stones with a diameter of less than 10 mm, they can be removed with a stone-removing basket or a balloon. The guide ring 4 is movably arranged on the metal guide head 2-1, and the connecting component 3 movably fixes the guide ring 4 on the metal guide head 2-1, and the guide ring 4 can swing along the axial direction of the connecting component 3.

[0047] The method of using the biliary stone removal device is as follows:

[0048] like Figures 4 to 6 As shown, the guide wire 5 is passed through the duodenoscope 9 into the cholangiography to understand the position, size and number of the stones 6, and then the lower papilla of the duodenum 8 is cut off, and one end of the guide wire 5 is inserted into the common bile duct 7 to exceed the position of the stones 6. The guide ring 4 is sleeved on the other end of the guide wire 5, and the guide ring 4 is swung to a suitable angle along the metal guide head 2-1, and the sheath 1 is pushed to make the net basket 2 and the metal guide head 2-1 move forward along the guide wire 5; when the net basket 2 extends from the clamp opening of the lifting forceps, the guide ring 4 continues to move along the guide wire 5 moves forward, and the basket 2 as a whole passes through the duodenal papilla 8 and enters the common bile duct 7 under the guidance of the guide wire 5; when the guide head 2-1 moves to a position beyond the stone 6, the pull rope 2-3 is pushed to make the basket body 2-2 move along the axial direction of the sheath 1 to be separated from the sheath 1, and the basket body 2-2 opens under the action of its own elastic force, and then wraps the stone 6 to perform the stone removal or lithotripsy operation, and then the pull rope 2-3 is pulled to pull the basket body 2-2 out of the common bile duct 7 to complete the stone removal or lithotripsy.

[0049] The stone removal device provided in this embodiment provides a guide ring 4 on the metal guide head 2-1 of the basket 2, without the need to add a tube on the outside of the sheath 1 or to use a multi-lumen sheath; secondly, the connecting component 3 and the guide head 2-1 of the basket 2 are fixed with reliable strength through welding, and the guide ring 4 is located between the connecting component 3 and the guide head 2-1 of the basket 2, and can be rotated or swung along the connecting component 3, thereby automatically adjusting the relative angle between the guide wire 5 and the basket 2, and making the guidance smoother.

[0050] The above is a detailed introduction to the bile duct stone removal device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A biliary stone removal device, comprising a sheath tube (1) and a net basket (2), wherein the end of the net basket (2) is provided with a guide head (2-1), characterized in that: It also comprises a connecting component (3) fixedly mounted on the guide head (2-1) and a guide ring (4) sleeved on the connecting component (3) and allowing a guide wire (5) to pass through, wherein the guide ring (4) is hingedly connected to the connecting component (3); The connecting component (3) is provided with a hollow portion, and the guide ring (4) is sleeved in the hollow portion and can swing freely around the connecting component (3); the size of the hollow portion is larger than the ring width of the guide ring (4).

2. The biliary stone removal device according to claim 1, characterized in that: The connecting component (3) is provided with a limiting portion (3-1) for limiting the movement limit position of the guide ring (4).

3. The biliary stone removal device according to claim 2, characterized in that: The corners of the limiting portion (3-1) are provided with circular arc chamfers.

4. The biliary stone removal device according to claim 2, characterized in that: The connection component (3) is formed into the limiting portion (3-1) by cutting, or the connection component (3) is formed into the limiting portion (3-1) by metal injection molding.

5. The biliary stone removal device according to claim 1, characterized in that: The connecting component (3) and the guide head (2-1) are connected by welding, snap-fitting or threading.

6. The biliary stone removal device according to claim 1, characterized in that: The net basket (2) comprises a net basket body (2-2) and a cable (2-3); the guide head (2-1) is located at an end of the net basket body (2-2) away from the cable (2-3); the cable (2-3) runs through the inside of the sheath tube (1); and the cable (2-3) can pull the net basket body (2-2) into or out of the sheath tube (1).

7. The biliary stone removal device according to claim 1, characterized in that: The net basket (2) is a stone-removing net basket, a stone-crushing net basket, or an integrated stone-removing and stone-crushing net basket.

8. The biliary stone removal device according to claim 1, characterized in that: The net basket comprises a net basket body (2-2); the shape of the steel wires of the net basket body (2-2) after being unfolded can be curved, angular or spiral, and the number of steel wires of the net basket body (2-2) is 4, 5, 6 or 8.

9. The biliary stone removal device according to any one of claims 1 to 8, characterized in that: An end surface of the connecting component (3) away from the guide head (2-1) is an arc-shaped curved surface, and the arc-shaped curved surface is a cylindrical curved surface or a spherical curved surface.

10. The biliary stone removal device according to claim 9, characterized in that: The guide ring (4) is in the shape of a circular ring or an elliptical ring, so that it can penetrate the hollow portion of the connecting component (3) and can swing freely along the hollow portion. The cross-section of the guide ring (4) along its circumference is circular or elliptical.

11. The biliary stone removal device according to claim 9, characterized in that: The hollow portion is sleeved with the guide ring (3), and the sleeved surface of the hollow portion and the guide ring (3) is a smooth curved surface.

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