Stone fixing device

Abstract

The invention provides a calculus fixing device, which relates to the technical field of medical instruments and specifically comprises a puncture sheath, a driving mechanism and a grabbing assembly, the puncture sheath is provided with a setting space, one end of the puncture sheath is a puncture end, and the puncture end is communicated with the setting space; the driving mechanism is arranged in the setting space, a first connecting end and a second connecting end are arranged on the side, close to the puncturing end, of the driving mechanism, and the driving mechanism can move in the extending direction of the puncturing sheath so that the first connecting end and the second connecting end can move out of the puncturing end and get away from each other or get close to each other and then be collected into the puncturing sheath; the two grabbing assemblies are connected with the first connecting end and the second connecting end correspondingly, and each grabbing assembly comprises a screen. According to the stone fixing device, the position of the stone can be fixed, alignment of a laser optical fiber is facilitated, so that the operation efficiency is improved, the crushed stone can be screened, it is guaranteed that the stone is crushed in place, and the phenomenon that large-size stone is left and needs to be crushed in an operation again is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a stone fixing device. Background Art

[0002] Data shows that the incidence of gallstones in my country is approximately 7%-10%. These stones are primarily composed of cholesterol, pigment, and mixed types. Conventional treatments for gallstones include general therapy, medication, and surgery. General therapy is typically indicated for patients with mild clinical symptoms, and regular follow-up visits are recommended. Medication therapy is typically indicated for patients with frequent clinical symptoms that can improve their condition. Surgical treatment is typically reserved for patients with frequent symptoms that significantly impact their daily lives.

[0003] Laser lithotripsy is a commonly used treatment for gallstones. An optical fiber is delivered through an endoscope to the surface of the gallstone, where the high energy of a holmium laser breaks up the gallstones, which are then expelled from the body through the digestive tract. Percutaneous laser lithotripsy can be considered for patients with biliary space-occupying lesions, biliary malformations, or bile duct strictures, where endoscopic access to the gallbladder is difficult.

[0004] Percutaneous laser lithotripsy is a procedure in which a laser fiber is delivered percutaneously into the gallbladder to perform stone crushing surgery. It can be performed under ultrasound guidance. However, during percutaneous laser lithotripsy, the operator needs to use ultrasound content to determine whether the laser fiber has been delivered to the right position. Observation and operation are relatively inconvenient, the operation efficiency is low, and the stone crushing situation cannot be seen intuitively. It is easy for stones to not be crushed properly, and large stones cannot be discharged with bile, requiring another operation. Summary of the Invention

[0005] The purpose of the present invention is to provide a stone fixing device to alleviate the technical problems in the prior art, such as the inconvenience of observation and operation for the surgeon, low surgical efficiency, and inadequate crushing of existing stones, necessitating further surgery.

[0006] The present invention provides a stone fixing device, comprising: a puncture sheath, a driving mechanism and a grabbing assembly; the puncture sheath has a setting space, one end of the puncture sheath is an insertion end, and the insertion end is connected to the setting space; the driving mechanism is arranged in the setting space, and a first connecting end and a second connecting end are provided on the side of the driving mechanism close to the insertion end, and the driving mechanism can move along the extension direction of the puncture sheath so that the first connecting end and the second connecting end move out of the insertion end and move away from each other, or make the first connecting end and the second connecting end approach each other and then be retracted into the puncture sheath; there are two grabbing assemblies and they are respectively connected to the first connecting end and the second connecting end, and the grabbing assembly includes a screen, and the two screens are surrounded outside the puncture sheath to form a limited space for fixing stones.

[0007] Furthermore, the driving mechanism includes: a telescopic component and an opening and closing component; the telescopic component is arranged in the setting space and can move along the extension direction of the puncture sheath; the opening and closing component is transmission-connected to one end of the telescopic component close to the insertion end, and the opening and closing component includes a first swing arm and a second swing arm, and the ends of the first swing arm and the second swing arm away from the telescopic component are the first connecting end and the second connecting end.

[0008] Furthermore, the telescopic assembly includes: a first driving member; the first driving member is arranged in the setting space and can move along the extension direction of the puncture sheath, and one end of the first driving member is connected to the expansion and contraction assembly.

[0009] Furthermore, the opening and closing assembly includes: a mounting seat and a second driving member; the mounting seat is arranged at one end of the first driving member close to the insertion end, and the first swing arm and the second swing arm are both hinged to the mounting seat; the second driving member is respectively connected to the first swing arm and the second swing arm, so that the first connecting end and the second connecting end are away from each other after being moved out of the puncture sheath.

[0010] Furthermore, the telescopic assembly also includes: a moving tube; the moving tube is arranged in the setting space and can move in the extension direction of the puncture sheath, the first moving tube has a moving space, and the first driving member is arranged in the moving space.

[0011] Furthermore, the second driving member is a pin shaft; guide grooves are provided on the first swing arm and the second swing arm, and the ends of the two guide grooves away from the second driving member extend upward and downward respectively; the pin shaft is inserted into the two guide grooves and both ends of the pin shaft are provided on the movable tube.

[0012] Furthermore, a guide groove is provided on the mounting seat, the guide groove is located at the end of the mounting seat, a rotating shaft is provided in the guide groove, and the first swing arm and the second swing arm are connected to the rotating shaft to achieve hinged connection with the mounting seat.

[0013] Furthermore, the grabbing assembly further includes: an elastic mounting ring; there are two elastic mounting rings respectively connected to the first connecting end and the second connecting end, and the two screens are respectively arranged on the elastic mounting rings in a one-to-one correspondence.

[0014] Furthermore, the mesh size of the sieve is less than or equal to 0.5 cm.

[0015] Furthermore, the screen is made of medical nylon.

[0016] Beneficial effects:

[0017] The stone fixation device provided by the present invention can achieve percutaneous puncture through the puncturing end of the puncture sheath and thus enter the position where the stone is located in the patient's body. Subsequently, the first connection end and the second connection end are extended out of the puncture sheath through the driving mechanism, and the two sieves of the grasping assembly form a limiting space. At this time, the stone fixation device is moved in combination with the content of the ultrasound, so that the two sieves wrap the stone in the limiting space. Subsequently, percutaneous laser lithotripsy is performed. The small stones generated after the stone is broken and that the patient can expel by himself / herself fall out of the limiting space through the sieve. The large-volume stones cannot pass through the sieve, and the stones in the limiting space can continue to be broken by the laser optical fiber until all the stones in the limiting space fall out through the sieve, thus achieving in-place fragmentation. After use, the first connection end and the second connection end can carry the sieve back into the setting space through the driving mechanism, and the puncture sheath is withdrawn from the patient's body to complete the removal of the stone fixation device.

[0018] The stone fixation device provided by the present invention can fix the position of the stone, facilitate the alignment of the laser optical fiber, thereby improving the surgical efficiency, and can perform sieving treatment on the broken stones to ensure that the stones are broken in place, avoiding the phenomenon that large-volume stones remain and need to be broken again surgically. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the stone fixation device provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the positional relationship among the puncture sheath, the driving mechanism and the opening and closing assembly in the stone fixation device provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the positional relationship between the puncture sheath and the telescopic assembly in the stone fixation device provided by an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the stone fixation device in the state where the first swing arm and the second swing arm are opened in the opposite direction provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of the stone fixation device in the state where the first swing arm and the second swing arm wrap the stone provided by an embodiment of the present invention;

[0025] Figure 6is Figure 5 the top view of

[0026] Figure 7 is Figure 6 the sectional view taken along line A - A in

[0027] Figure 8 the schematic diagram showing the positional relationship between the second driving member and the first swing arm and the second swing arm in the stone fixing device provided by the embodiment of the present invention.

[0028] Icon:

[0029] 100 - puncture sheath;

[0030] 200 - driving mechanism; 201 - first connection end; 202 - second connection end; 210 - telescopic assembly; 211 - first driving member; 212 - mounting seat; 213 - second driving member; 214 - moving tube; 220 - opening and closing assembly; 221 - first swing arm; 222 - second swing arm;

[0031] 300 - grasping assembly; 310 - screen; 320 - elastic mounting ring. Detailed Embodiments

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0036] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] The present invention will be further described in detail below through specific embodiments in conjunction with the drawings.

[0039] Refer to Figures 1 to 8 , the stone fixing device provided in this embodiment includes a puncture sheath 100, a driving mechanism 200, and a grasping assembly 300.

[0040] Among them, the puncture sheath 100 has a setting space. One end of the puncture sheath 100 is a piercing end, and the piercing end is in communication with the setting space. The driving mechanism 200 is arranged in the setting space. A first connection end 201 and a second connection end 202 are provided on one side of the driving mechanism 200 close to the piercing end. The driving mechanism 200 can move along the extension direction of the puncture sheath 100 so that the first connection end 201 and the second connection end 202 move out of the piercing end and move away from each other, or the first connection end 201 and the second connection end 202 move closer to each other and then are received into the puncture sheath 100. There are two grasping assemblies 300 which are respectively connected to the first connection end 201 and the second connection end 202. The grasping assembly 300 includes a screen 310. The two screens 310 enclose outside the puncture sheath 100 to form a limiting space for fixing the stone.

[0041] Specifically, for ease of understanding, this embodiment uses gallstones as an example. The stone fixation device can be inserted into the patient's body through the insertion end of the puncture sheath 100 to achieve skin puncture, reaching the gallbladder where the stone is located. Subsequently, the first connecting end 201 and the second connecting end 202 are extended out of the puncture sheath 100 by the driving mechanism 200, and the two screens 310 of the grasping assembly 300 form a confined space.

[0042] At this point, the stone-fixing device is moved in conjunction with the ultrasound, allowing the two screens 310 to enclose the stone within the confined space. Percutaneous laser lithotripsy is then performed. During percutaneous laser lithotripsy, small fragments of stone fragments, which the patient can excrete naturally, fall through the screens 310 and out of the confined space. Remember, the fragments can flow with bile into the digestive tract and ultimately be excreted from the body.

[0043] The large stones in the confined space cannot pass through the screen 310, thus achieving the goal of screening the stones. The laser fiber continues to crush the stones in the confined space until all the stones in the confined space fall through the screen 310, achieving the goal of crushing the stones.

[0044] After the stone is crushed into place, the first connecting end 201 and the second connecting end 202 carrying the screen 310 are retracted into the setting space through the driving mechanism 200. At this time, the puncture sheath 100 can be pulled out from the patient's body to achieve the removal of the stone fixing device.

[0045] The stone fixing device provided in this embodiment can fix the position of the stone so that the laser optical fiber can be aligned and reach the surface of the stone, thereby improving the efficiency of the operation. At the same time, it can also screen the crushed stones to ensure that the stones are crushed in place, avoiding the phenomenon of large-volume stones remaining and requiring re-operation to crush them.

[0046] In this embodiment, the drive mechanism 200 includes a telescopic assembly 210 and an opening and closing assembly 220. The telescopic assembly 210 is disposed within the installation space and is movable along the extension direction of the puncture sheath 100. The opening and closing assembly 220 is drivingly connected to the end of the telescopic assembly 210 that is closer to the insertion end. The opening and closing assembly 220 includes a first swing arm 221 and a second swing arm 222. The ends of the first and second swing arms 221 and 222 that are farther from the telescopic assembly 210 are the first and second connecting ends 201 and 202.

[0047] The telescopic assembly 210 is in transmission connection with the opening and closing assembly 220, so that the opening and closing assembly 220 can move along with the telescopic assembly 210. When the telescopic assembly 210 moves axially along the puncture sheath 100, the opening and closing assembly 220 can be driven to extend out of the puncture sheath 100 along the insertion end.

[0048] After the first swing arm 221 and the second swing arm 222 extend out of the puncture sheath 100, the ends of the first swing arm 221 and the second swing arm 222 away from the telescopic assembly 210 open in the opposite direction, that is, the first connection end 201 and the second connection end 202 move away from each other, thereby driving the screen 310 to unfold together to form a limiting space.

[0049] As an implementable manner, the first swing arm 221 and the second swing arm 222 can be made of shape memory alloy. When the first swing arm 221 and the second swing arm 222 are located in the setting space, the first swing arm 221 and the second swing arm 222 are in a compressed state under the constraint of the puncture sheath 100. After the first swing arm 221 and the second swing arm 222 move out of the puncture sheath 100, the first swing arm 221 and the second swing arm 222 lose the constraint and undergo a restorative deformation to open in the opposite direction, and at the same time drive the screen 310 to unfold to form a limiting space. After use, the first swing arm 221 and the second swing arm 222 are pulled by the telescopic assembly 210 to move towards the setting space, and the puncture sheath 100 compresses the first swing arm 221 and the second swing arm 222 so that the first swing arm 221 and the second swing arm 222 can be retracted into the puncture sheath 100.

[0050] In this embodiment, the telescopic assembly 210 includes a first driving member 211. The first driving member 211 is disposed in the setting space and can move along the extending direction of the puncture sheath 100, and one end of the first driving member 211 is connected to the opening and closing assembly 220.

[0051] Specifically, in this embodiment, the extending direction of the first driving member 211 is the same as the extending direction of the puncture sheath 100. One end of the first driving member 211 is located near the piercing end of the puncture sheath 100 and is used to install the opening and closing assembly 220, and the other end of the first driving member 211 is located outside the puncture sheath 100, so that the operator can hold and pull on the side of the puncture sheath 100 away from the piercing end, thereby realizing the movement and driving of the opening and closing assembly 220.

[0052] Among them, the first driving member 211 is disposed in the puncture sheath 100, which can ensure that the overall volume of the stone fixing device is small and convenient for use.

[0053] Moreover, the puncture sheath 100 can guide the first driving member 211 to ensure that the first driving member 211 can move along a preset track.

[0054] In this embodiment, the opening and closing assembly 220 includes a mounting seat 212 and a second driving member 213. The mounting seat 212 is disposed at one end of the first driving member 211 near the piercing end, and both the first swing arm 221 and the second swing arm 222 are hinged to the mounting seat 212. The second driving member 213 is respectively connected to the first swing arm 221 and the second swing arm 222, so that the first connection end 201 and the second connection end 202 move away from each other after moving out of the puncture sheath 100.

[0055] Specifically, in this embodiment, the first swing arm 221 and the second swing arm 222 are hingedly connected to the mounting base 212 to control the rotational direction of the first swing arm 221 and the second swing arm 222. The second driving member 213 can drive the first swing arm 221 and the second swing arm 222 to rotate along a predetermined trajectory.

[0056] As an operative method, the second driving member 213 can be an elastic member, such as a spring. The two ends of the spring are respectively in contact with the first swing arm 221 and the second swing arm 222. When the first swing arm 221 and the second swing arm 222 are unconstrained, the hinged ends of the first swing arm 221 and the second swing arm 222 with the mounting base 212 are stationary, and the other ends are away from each other, so that the first swing arm 221 and the second swing arm 222 are in a fan-shaped open state. Under this structure, the first swing arm 221 and the second swing arm 222 extend outside the setting space. The first swing arm 221 and the second swing arm 222 are opened under the action of the spring. After the screen 310 encloses the stone, the first driving member 211 is pulled a small amount toward the side away from the insertion end, so that the top end of the first swing arm 221 and the bottom end of the second swing arm 222 are blocked by the puncture sheath 100. The first swing arm 221 and the second swing arm 222 are forced to close, realizing the encirclement of the two screens 310.

[0057] In this embodiment, the telescopic assembly 210 further includes a moving tube 214. The moving tube 214 is disposed in the setting space and is movable in the extension direction of the puncture sheath 100. The first moving tube 214 has a moving space therein, and the first driving member 211 is disposed in the moving space.

[0058] Specifically, the movable tube 214 in this embodiment is arranged in the puncture sheath 100, and the moving direction of the movable tube 214 and the first driving member 211 is the same. The outer wall of the movable tube 214 is in contact with and slides with the inner wall of the puncture sheath 100, and the first driving member 211, the opening and closing component 220, and the grasping component 300 are all located in the movable tube 214 in the contracted state.

[0059] When the stone fixing device provided in this embodiment is inserted into place, the movable tube 214 can be pushed toward the insertion end so that the end of the movable tube 214 close to the stone can extend out of the puncture sheath 100, and then the first driving member 211 is pulled to control the opening and closing component 220 and the grabbing component 300.

[0060] In this embodiment, the second driving member 213 is a pin. Guide slots are provided on both the first swing arm 221 and the second swing arm 222. The ends of the guide slots, away from the second driving member 213, extend upward and downward, respectively. The pin is inserted into the two guide slots, with both ends of the pin attached to the movable tube 214.

[0061] Specifically, in this embodiment, the pin shaft is fixed to one end of the moving tube 214 close to the stone. The guiding groove on the first swing arm 221 extends obliquely upward in the direction away from the first driving member 211. On the contrary, the guiding groove on the second swing arm 222 extends obliquely downward in the same direction. In this structure, the first swing arm 221 and the second swing arm 222 swing upward and downward respectively under the push of the first driving member 211, so as to realize the opening action of the first swing arm 221 and the second swing arm 222.

[0062] Similarly, by pulling the first driving member 211 in the reverse direction, the first swing arm 221 and the second swing arm 222 can be closed.

[0063] In this embodiment, a guiding groove is provided on the mounting seat 212. The guiding groove is located at the end of the mounting seat 212. A rotating shaft is provided in the guiding groove. The first swing arm 221 and the second swing arm 222 are connected to the rotating shaft to realize the hinge connection with the mounting seat 212.

[0064] Specifically, in this embodiment, the guiding groove extends in the vertical direction. The two ends of the rotating shaft are respectively inserted into the opposite two groove walls of the guiding groove. The rotating ends of the first swing arm 221 and the second swing arm 222 (i.e., the ends far from the first connection end 201 and the second connection end 202) are both sleeved on the rotating shaft, so that the first swing arm 221 and the second swing arm 222 can rotate around the rotating shaft.

[0065] The guiding groove can limit the first swing arm 221 and the second swing arm 222, avoiding the horizontal movement of the first swing arm 221 and the second swing arm 222, resulting in the dislocation of the screen 310 on the first swing arm 221 and the second swing arm 222, and the stone cannot be wrapped in the limiting space.

[0066] In this embodiment, the grasping assembly 300 further includes elastic mounting rings 320. There are two elastic mounting rings 320, which are respectively connected to the first connection end 201 and the second connection end 202. The two screens 310 are respectively arranged on the elastic mounting rings 320 in one-to-one correspondence.

[0067] Specifically, the two elastic mounting rings 320 in this embodiment are respectively fixed to the first connection end 201 of the first swing arm 221 and the second connection end 202 of the second swing arm 222. The two screens 310 are correspondingly installed in the elastic mounting rings 320. In this structure, when the first swing arm 221 and the second swing arm 222 move out of the setting space following the first driving member 211, the first swing arm 221 swings upward, the second swing arm 222 swings downward. At the same time, the elastic mounting rings 320 lose the restraint of the moving tube 214 and undergo a restorative deformation and open, so as to expand the two screens 310, and further form a limiting space between the two screens 310.

[0068] In this embodiment, the mesh aperture of the sieve 310 is less than or equal to 0.5 cm.

[0069] Specifically, the setting that the aperture of the sieve 310 is ≤ 0.5 cm is based on the natural anatomical characteristics of the human biliary tract (the diameter of the common bile duct is about 6 - 8 mm). In this structure, it can ensure that the size of the crushed stone fragments is smaller than the smallest physiological channel of the bile duct, and can be directly discharged naturally with bile without causing the risk of impaction.

[0070] In this embodiment, the sieve 310 is made of medical nylon material.

[0071] Medical nylon has a relatively excellent elastic modulus and can produce buffer deformation under the impact of lithotripsy, which can avoid tissue scratches caused by hard materials. And it can avoid the micro-burr defects of the traditional wire-woven sieve 310.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calculus fixation device, characterized in that, include: A puncture sheath (100) has a setting space, one end of the puncture sheath (100) is a puncture end, and the puncture end is connected to the setting space; A driving mechanism (200) is provided in the setting space. A first connecting end (201) and a second connecting end (202) are provided on a side of the driving mechanism (200) close to the puncture end. The driving mechanism (200) can move along the extension direction of the puncture sheath (100) so that the first connecting end (201) and the second connecting end (202) move out of the puncture end and away from each other, or the first connecting end (201) and the second connecting end (202) move closer to each other and then are retracted into the puncture sheath (100). There are two grasping components (300) connected to the first connecting end (201) and the second connecting end (202) respectively. The grasping components (300) include a screen (310). The two screens (310) are surrounded outside the puncture sheath (100) to form a limited space for fixing stones.

2. The stone fixing device according to claim 1, wherein The driving mechanism (200) comprises: a telescopic assembly (210), disposed in the installation space and capable of moving along the extension direction of the puncture sheath (100); The opening and closing assembly (220) is transmission-connected to the end of the telescopic assembly (210) close to the piercing end. The opening and closing assembly (220) comprises a first swing arm (221) and a second swing arm (222). The ends of the first swing arm (221) and the second swing arm (222) away from the telescopic assembly (210) are the first connecting end (201) and the second connecting end (202).

3. The stone fixing device according to claim 2, characterized in that, The telescopic assembly (210) comprises: The first driving member (211) is arranged in the setting space and can move along the extension direction of the puncture sheath (100), and one end of the first driving member (211) is connected to the opening and closing assembly (220).

4. The stone fixation device according to claim 3, characterized in that, The opening and closing assembly (220) comprises: A mounting seat (212) is provided at one end of the first driving member (211) close to the piercing end, and the first swing arm (221) and the second swing arm (222) are both hinged to the mounting seat (212); The second driving member (213) is connected to the first swing arm (221) and the second swing arm (222) respectively, so that the first connecting end (201) and the second connecting end (202) are moved away from each other after being moved out of the puncture sheath (100).

5. The stone fixation device according to claim 4, characterized in that, The telescopic assembly (210) further includes: The movable tube (214) is arranged in the setting space and can move in the extension direction of the puncture sheath (100). The movable tube (214) has a movable space therein, and the first driving member (211) is arranged in the movable space.

6. The stone fixation device according to claim 5, wherein The second driving member (213) is a pin; The first swing arm (221) and the second swing arm (222) are both provided with guide grooves, and ends of the two guide grooves away from the second driving member (213) extend upward and downward respectively; The pin shaft is inserted into the two guiding grooves, and both ends of the pin shaft are arranged on the moving pipe (214).

7. The stone fixing device according to claim 4, wherein The mounting base (212) is provided with: Guiding grooves, located at the end of the mounting base (212). A rotating shaft is arranged in the guiding grooves. The first swing arm (221) and the second swing arm (222) are connected to the rotating shaft to realize the hinge connection with the mounting base (212).

8. The stone fixation device according to claim 1, characterized in that, The grasping assembly (300) further includes: Elastic mounting rings (320), there are two and they are respectively connected to the first connection end (201) and the second connection end (202). The two screen meshes (310) are respectively arranged on the elastic mounting rings (320) in a one-to-one correspondence.

9. The stone fixation device according to claim 1, characterized in that, The mesh aperture of the screen mesh (310) is less than or equal to 0.5 cm.

10. The stone fixation device according to any one of claims 1-9, characterized in that, The screen mesh (310) is made of medical nylon material.

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