Basket mechanism with transparent film

Abstract

The invention relates to a calculus removal basket mechanism with a transparent film, and solves the technical problems of frequent instrument blockage and low calculus removal efficiency in a flexible ureteroscope and negative pressure sheath lithotripsy. The mechanism comprises a framework composed of a plurality of metal wires, a high-transparency film wrapping the periphery of the framework, an outer sleeve, a central guide pipe and a push-pull control device. The framework is automatically opened to form an umbrella-shaped or cup-shaped structure when being pushed out of the outer sleeve, and can be contained in a gap between the outer sleeve and the central guide pipe when being folded. In an operation, small stones are sucked out through the meshes under negative pressure, and large stones are taken out along with a lens after being intercepted by the film, so that synchronous operation of stone crushing and stone removing is realized. The high transparency of the film ensures that the surgical field is clear, the intrarenal pressure is stabilized in a safe range, and the risk of postoperative complications is remarkably reduced. The calculus removing device is simple in structure, convenient to operate, suitable for calculus of different parts such as renal pelvis and renal calyx, and high in efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of endoscopic minimally invasive treatment technology for urinary stones, specifically to a stone retrieval basket mechanism for use in flexible ureteroscopy, particularly a stone retrieval basket structure with a highly transparent film, suitable for use with a negative pressure suction system to achieve efficient and safe stone fragmentation and removal. Background Technology

[0002] In the field of minimally invasive treatment of urinary stones, flexible ureteroscopy has become one of the core surgical procedures due to its advantages of operating through natural cavities and minimal trauma. In recent years, the synergistic application of disposable flexible ureteroscopes with negative pressure sheaths and intrarenal manometry has formed an integrated treatment model of "precise stone fragmentation - efficient stone removal - safe pressure control," significantly optimizing surgical efficacy. This combined technical approach retains the advantages of infection control from disposable flexible ureteroscopes while compensating for the shortcomings of individual instruments through equipment complementarity.

[0003] With the integrated development of minimally invasive technology, disposable flexible endoscopes have been upgraded from a single lithotripsy tool to the core of a combined treatment platform. Their combined application with negative pressure sheaths (with active suction function), fiber optic pressure measurement, or pressure-sensing catheters has achieved a leap from "breaking up stones" to "removing stones + controlling risks," expanding their indications to include some 2-3cm kidney stones and complex multiple stones, making them a preferred option that balances efficacy and safety.

[0004] The combination of a disposable flexible endoscope and a negative pressure sheath allows the sheath's active drainage function to reduce intrarenal pressure, enabling this combined approach to safely treat kidney stones with a diameter of 2-3 cm, overcoming the limitations of a single flexible endoscope for stones larger than 2 cm. For high-risk patients with hypertension or chronic kidney disease, the simultaneous application of intrarenal pressure monitoring technology (which activates an early warning when intrarenal pressure exceeds 40 cmH2O) can prevent renal parenchymal damage or urosepsis caused by excessive pressure, further narrowing the range of contraindications. Furthermore, this approach improves the success rate of treating complex cases such as residual stones after extracorporeal shock wave lithotripsy and horseshoe kidney with stones by 20%-30% compared to a single flexible endoscope.

[0005] This joint approach forms a closed-loop process of "flexible endoscopic lithotripsy - negative pressure stone removal": a disposable flexible endoscope is equipped with a holmium laser or thulium laser of more than 200um through the working channel to break the stone into 1-2mm particles under direct vision; the negative pressure sheath inserted at the same time actively sucks out the stone fragments from the body through a controllable negative pressure of 150-300mmHg, avoiding fragment residue or displacement.

[0006] However, this combined technology faces serious device clogging problems in clinical applications, which has become a key obstacle to its efficient implementation. Clogging mainly occurs in two locations:

[0007] The incidence of negative pressure sheath blockage is about 8%-12%, and the core causes include: (1) Stone fragment accumulation: 2-5 mm irregular particles generated during lithotripsy accumulate at the inlet or inner wall of the sheath under negative pressure, especially when the sheath tip is attached to the renal calyx wall, which is prone to forming "particle embolism"; (2) Blood clot formation: After the renal calyx mucosa is damaged and bleeds, the blood mixes with the stone fragments and adheres to the inner wall of the sheath under the negative pressure drainage and gradually coagulates into a clot, leading to stenosis or even complete blockage of the lumen.

[0008] The incidence of blockage in the working channel of flexible endoscopy is about 3%-5%. This is mainly because the pressure measuring catheter occupies 1 / 3-1 / 2 of the working channel space, which reduces the effective flow area of ​​the channel. Fine stone powder (<1mm) that falls off during lithotripsy accumulates in the gap between the catheter and the channel wall. In addition, the repeated movement of the laser fiber causes residual mucosal tissue and insufficient flow rate of the flushing fluid, which ultimately leads to channel blockage.

[0009] Blockage has multiple negative impacts on surgery: (1) Reduced efficiency: A single blockage clearance takes 5-15 minutes, and multiple blockages extend the total surgery time by 20%-40%; (2) Decreased efficacy: After the negative pressure sheath is blocked, the active drainage function fails, the stone clearance speed decreases by more than 50%, and the incidence of residual stones after surgery increases from the usual 5%-10% to 15%-25%; (3) Safety risks: The intrarenal pressure can suddenly rise from 20cmH2O to 40-60cmH2O during blockage. Sustained high pressure can lead to renal parenchymal ischemia, renal tubular damage, and even urine reflux into the perirenal space. If the pressure measurement pathway is blocked at the same time, the doctor cannot detect the pressure increase in time, and the risk of urosepsis can increase from <0.5% to 2%-3%.

[0010] Current clinical treatment measures have significant limitations: blockage of the negative pressure sheath requires either "sheath removal and cleaning + sheath replacement" or "high-pressure flushing to clear the tube." The former can easily lead to displacement of stone fragments, while the latter may instantly increase intrarenal pressure. Blockage of the flexible endoscope's working channel often requires replacement of the flexible endoscope, increasing medical costs and surgical time.

[0011] Although the stone removal device disclosed in the existing patent CN201610870004.4 has improved the stone removal efficiency to a certain extent, it still has technical defects such as obstructing the field of vision, affecting negative pressure suction, and being unable to effectively separate stones of different sizes. It is difficult to meet the requirements of modern minimally invasive lithotripsy surgery for simultaneous operation of "shredding and cleaning stones at the same time". Summary of the Invention

[0012] The purpose of this invention is to provide a stone-collecting basket mechanism with a transparent film to solve the problems mentioned in the background art above:

[0013] (1) Effectively intercept larger stone fragments without obstructing the surgical field of view, and prevent blockage of the working channel;

[0014] (2) The automatic separation of large and small stones is achieved by using negative pressure suction. Small particles are directly sucked out, while large stones are left in the basket and removed with the microscope.

[0015] (3) Supports simultaneous operation of "shock breaking and stone removal", which significantly improves surgical efficiency and safety.

[0016] To achieve the above objectives, the present invention provides the following technical solution:

[0017] A stone-collecting basket mechanism with a transparent film;

[0018] It includes an outer tube, a central conduit, a push-pull control tube, a skeleton with shape memory function, and several films;

[0019] The central catheter is fitted inside the push-pull control tube, which in turn is fitted inside the outer tube;

[0020] The rear end of the skeleton is fixedly connected to the front end face of the push-pull control tube, and several films are fixed on the skeleton;

[0021] The push-pull control tube can pull the skeleton in and out of the gap between the central guide tube and the outer tube. After the skeleton extends out of the front side of the outer tube, the skeleton unfolds outward in the circumferential direction of the outer tube. When the skeleton extends into the inner hole of the outer tube, the skeleton and the membrane fold into a bundle and can be accommodated in the annular gap between the outer tube and the central guide tube.

[0022] Based on the above technical solution, the present invention can be further improved as follows.

[0023] Furthermore, the skeleton includes several metal wires with shape memory function. The two ends of the metal wires are fixedly connected to the front end face of the push-pull control tube. The metal wires are wound into an arc shape on the front side of the push-pull control tube. Several metal wires are evenly distributed around the circumference of the outer tube axis. Any adjacent metal wires are fixedly connected to each other. Several films are fixed on several metal wires of the skeleton.

[0024] Furthermore, the metal wire has an outward bend near the front end of the push-pull control tube.

[0025] Furthermore, the metal wire is selected from nickel-titanium alloy wire or high-elasticity stainless steel wire.

[0026] Furthermore, the film has several mesh openings near the front end face of the push-pull control tube.

[0027] Furthermore, the film has a notch near the front end of the push-pull control tube.

[0028] Furthermore, the film is selected as a transparent film.

[0029] Furthermore, the film can be an optical-grade BOPET high-transparency film or a TPU high-transparency film with good light transmittance.

[0030] Furthermore, the central conduit has an inner hole through which a laser fiber can pass.

[0031] With this structure, the skeleton initially retracts into the outer sheath and ascends with the electronic endoscope through the urethra and ureter to the renal collecting system. Upon reaching the target location, the skeleton is pushed out of the outer sheath via a push-pull control tube, and the metal wires automatically open to form a stone retrieval basket structure, while the highly transparent membrane unfolds simultaneously.

[0032] At this point, negative pressure suction in the working channel allows small stone particles generated by laser lithotripsy to pass directly through the membrane mesh or scaffold gaps and be suctioned out of the body. Larger stone fragments are intercepted by the membrane within the basket, allowing the doctor to observe the stone accumulation and laser lithotripsy progress in real time through the transparent membrane. When the stones in the basket accumulate to a certain extent or when larger stones need to be removed, the push-pull control tube is pulled back while maintaining negative pressure, causing the scaffold to retract and securely capture the stones before withdrawing them from the body along with the endoscope, achieving simultaneous "stone fragmentation and removal."

[0033] If high-elasticity stainless steel wire is selected, the elasticity of the high-elasticity stainless steel wire itself is utilized. After the skeleton formed by the metal wire extends out of the outer tube, the skeleton expands outward in the circumferential direction of the outer tube. When the skeleton extends into the inner hole of the outer tube, the skeleton and the high-transparency film are squeezed and closed and folded, and the stone basket structure is completely closed. The skeleton and the high-transparency film are folded into a bundle that can be accommodated in the annular gap between the outer tube and the central guide tube. Furthermore, the skeleton has a tendency to expand outward in the circumferential direction of the outer tube.

[0034] If nickel-titanium alloy wire or other shape memory metal wire is selected, the expansion and contraction of the skeleton can be achieved by changing the temperature of the metal wire. The specific methods are: (1) By changing the water temperature in the negative pressure sheath, the shape memory metal wire can be deformed into an expanded state. Subsequently, the shape memory metal wire can be deformed into a contracted state by changing the water temperature. (2) The shape memory metal wire can also be energized. By controlling the current magnitude and energizing time, its temperature rise can be precisely controlled. Once the temperature exceeds its phase transition temperature (which depends on the alloy composition), the shape memory metal wire will trigger a shape change.

[0035] The beneficial effects of this stone-collecting basket mechanism with a transparent film are:

[0036] (1) Due to the large inner diameter of the flexible negative pressure sheath and the small gap between them, taking a 14 / 12Fr sheath and an 8.4Fr endoscope as an example, the maximum gap is 3.6Fr, or 1.2mm. At the same time, the contact area between the negative pressure sheath and the outer surface of the flexible endoscope is large, and blockage is more likely to occur during lithotripsy and stone removal. To prevent blockage, the method of inter-sheath irrigation and negative pressure in the working channel is adopted. While reducing the cross-sectional area between the sheaths, the cross-sectional area of ​​the working channel is increased, so that the cross-sectional areas of the two are equivalent. This can increase the working channel to about 2.1mm, which is conducive to the passage of stones.

[0037] (2) Under the infusion of the sheath and the negative pressure of the working channel, in order to ensure that the stone fragments do not block the working channel, the stone fragments need to be small enough. Enlarging the working channel can reduce the probability of stone fragment blockage and speed up the stone fragmentation process. In addition, in order to prevent larger stones from blocking the working channel, it is necessary to intercept at the opening of the working channel. On the one hand, small stones can be let go, and on the other hand, more and larger stones can be grabbed and removed along with the withdrawal process of the electronic endoscope, thus shortening the time for stone fragmentation and removal.

[0038] (3) The stone-collecting basket mechanism with a transparent film can not affect the negative pressure suction function of the working channel, can effectively isolate the influence of intersheath injection on negative pressure, can reduce the obstruction of the image by the interception structure, and does not affect the laser lithotripsy process. Attached Figure Description

[0039] Figure 1 This is a perspective view of Embodiment 1 of the stone-collecting basket mechanism with a transparent film in its unfolded state during use.

[0040] Figure 2 yes Figure 1 A three-dimensional view of the sectional view.

[0041] Figure 3 This is a three-dimensional longitudinal sectional view of the structure of Embodiment 1 of the stone retrieval basket mechanism with a transparent film in the unfolded state (the negative pressure sheath and electronic endoscope are not shown in the figure).

[0042] Figure 4 yes Figure 3 Enlarged view of part A.

[0043] Figure 5 This is a cross-sectional view of the first embodiment of the stone-collecting basket mechanism with a transparent film in the retracted state.

[0044] Figure 6 This is one of the longitudinal sectional views of the structural schematic diagram of Embodiment 2 of the stone-collecting basket mechanism with a transparent film in the unfolded state.

[0045] Figure 7This is the second longitudinal sectional view of the structural schematic diagram of Embodiment 2 of the stone retrieval basket mechanism with a transparent film in the unfolded state (the negative pressure sheath and electronic endoscope are not shown in the figure).

[0046] Figure 8 This is a three-dimensional view of the structure of Embodiment 3 of the stone-collecting basket mechanism with a transparent film in the unfolded state.

[0047] Figure 9 This is a three-dimensional view of the structure of Embodiment 3 of the stone-collecting basket mechanism with a transparent film in the unfolded state.

[0048] Figure 10 This is a longitudinal sectional view of the structure of Embodiment 4 of the stone-collecting basket mechanism with a transparent film in the unfolded state.

[0049] Figure 11 This is one of the perspective views of Embodiment 5 of the stone-collecting basket mechanism with a transparent film in its unfolded state during use.

[0050] Explanation of the labels in the diagram:

[0051] Central catheter - 100; Outer cannula - 200; Skeleton - 300; Metal wire - 310; Bending - 311; High transparency film - 400; Notch - 410; Mesh - 420; Push-pull control tube - 500; Negative pressure sheath - 600; Electronic endoscope - 700; Working channel - 710; Camera module - 720; Fiber optic cable - 800; Lithotripsy - 900. Detailed Implementation

[0052] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0053] The terms “vertical,” “horizontal,” “left,” “right,” and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] Example 1

[0056] Please see Figures 1 to 5 .

[0057] This stone retrieval basket mechanism with transparent films includes an outer tube 200, a central conduit 100, a push-pull control tube 500, a metal frame 300, and several highly transparent films 400.

[0058] The central conduit 100 is fitted inside the push-pull control tube 500. The inner hole of the central conduit 100 allows the laser fiber 800 to pass through. The push-pull control tube 500 is fitted inside the outer tube 200. The push-pull control tube 500 can reciprocate relative to the central conduit 100 and the outer tube 200 along their axial direction.

[0059] The skeleton 300 includes several metal wires 310 with shape memory function. The metal wires 310 are made of high elastic stainless steel wire. The two ends of the metal wires 310 are fixedly connected to the front end face of the push-pull control tube 500. The metal wires 310 are wound into an arc shape on the front side of the push-pull control tube 500. Several metal wires 310 are evenly distributed around the circumference of the outer tube 200. Any adjacent metal wires 310 are fixedly connected. Several highly transparent films 400 are fixed on several metal wires 310 of the skeleton 300.

[0060] The push-pull control tube 500 can pull the skeleton 300 in and out of the gap between the central conduit 100 and the outer tube 200. The stone retrieval basket structure can be unfolded and retracted through the push-pull operation. After the skeleton 300 extends out of the front side of the outer tube 200, the skeleton 300 unfolds outward in the circumferential direction of the outer tube 200 to form an umbrella-shaped stone retrieval basket structure.

[0061] When the skeleton 300 extends into the inner hole of the outer tube 200, the skeleton 300 and the highly transparent film 400 are squeezed and folded, and the stone basket structure is completely closed. The skeleton 300 and the highly transparent film 400 are folded into a bundle that can be accommodated in the annular gap between the outer tube 200 and the central conduit 100, and the skeleton 300 has a tendency to expand outward in the circumferential direction of the outer tube 200.

[0062] The high-transparency film 400 is made of a material with high puncture resistance, high transparency, and fold resistance, such as optical-grade BOPET high-transparency film 400. The thickness is no more than 0.1mm, with a common minimum thickness of 4μm. The light transmittance reaches 94%, and it can withstand 20,000-30,000 folds. Its puncture resistance is sufficient to resist scratches from everyday sharp objects such as keys. It must meet the size requirements after folding. The high-transparency film 400 has a notch 410 near the front end of the push-pull control tube 500. The frame 300 at its bottom and the edge of the high-transparency film 400 form a radial umbrella-shaped stone-collecting basket structure. The purpose of setting the notch 410 is to divide the entrance to intercept larger stones 900 and allow smaller stones 900 to pass through without affecting the negative pressure suction, thus avoiding blockage of the working channel 710 hole.

[0063] The bonding between adjacent high-transparency films 400 can be achieved using hot melt adhesive or UV adhesive under pressure, depending on the material of the high-transparency film 400. Folding can be done by pre-pressing creases into the high-transparency film 400 (without affecting transparency), or by rounding the corners at the central conduit 100. Since it is for single use only, the high-transparency film 400 does not need to be completely retracted for reuse; therefore, after folding, it only needs to pass through the working channel 710 of the electronic endoscope 700.

[0064] In use, the stone retrieval basket mechanism with transparent film of this embodiment is folded up, with the skeleton 300 and the highly transparent film 400 folded completely within the annular gap between the outer tube 200 and the central conduit 100. Then, the stone retrieval basket mechanism with transparent film is inserted into the working channel 710 of the electronic endoscope 700. The electronic endoscope 700, together with the stone retrieval basket mechanism with transparent film, is inserted into the negative pressure sheath 600. Furthermore, the inner hole of the central conduit 100 of the stone retrieval basket mechanism with transparent film of this embodiment can be penetrated by a 272μm laser fiber 800.

[0065] During operation, the stone retrieval basket mechanism with a transparent film is positioned within the working channel 710 of the electronic endoscope 700. The edge of the skeleton 300 contacts and adheres tightly to the working channel 710 of the electronic endoscope 700. Irrigation is performed using the gap between the electronic endoscope 700 and the negative pressure sheath 600 during the lithotripsy 900 procedure. Negative pressure suction is achieved using the working channel 710. The negative pressure environment of the working channel 710 of the electronic endoscope 700 is utilized during the laser lithotripsy 900 process. The fragments of stone (900 pieces) or detached tissue are drawn into the unfolded stone retrieval basket mechanism with a transparent membrane. Smaller fragments (900 pieces) or powdery particles are directly sucked into the negative pressure container through the central mesh and working channel 710. Larger fragments (900 pieces) accumulate in the stone retrieval basket as the surgery progresses. When the video image shows that the fragments (900 pieces) in the stone retrieval basket have reached a certain level, the transparent membrane stone retrieval basket mechanism and the fragments (900 pieces) can be removed together by withdrawing the electronic endoscope 700. Because of the umbrella-shaped stone-retrieving basket structure formed by the highly transparent thin film 400, the fragments 900 attracted by the negative pressure can accumulate inside the basket. Simultaneously, due to the high transparency (>92%) and ultra-thin wall thickness of the highly transparent film 400, the refraction and attenuation of light are minimal. Video images captured by the camera module 720 of the electronic endoscope 700 clearly show the accumulation of fragments 900 and the laser stone-retrieving process, enabling a simultaneous stone-retrieving and suction process. Larger stones can also be retrieved through continuous negative pressure. The combined pressure suction and endoscope withdrawal methods reduce lithotripsy time and improve lithotripsy efficiency. Furthermore, the transparent and highly transparent membrane 400 protects the intersheath perfusion water flow from affecting the negative pressure adsorption during endoscope withdrawal, enhancing the lithotripsy's ability to remove stones. Additionally, the relatively localized space created by the opening of the framework 300 allows the opening to be pressed against the renal calyx or covered during lithotripsy, forming a relatively enclosed space and reducing stone escape.

[0066] Example 2

[0067] Please see Figures 6 to 7 .

[0068] The only difference between this embodiment and Embodiment 1 is that the high-transparency film 400 is made of TPU high-transparency film 400 with high light transmittance (there are other similar materials that can be considered). The high-transparency film 400 has multiple mesh holes 420 near the front end face of the push-pull control tube 500. Because the radially distributed skeleton 300 divides the working channel 710 opening of the electronic endoscope 700, it can block larger stones 900 from entering and reduce channel blockage.

[0069] Example 3

[0070] Please see Figure 8 .

[0071] The only difference between this embodiment and Embodiment 1 is that the metal wire 310 is made of nickel-titanium alloy. Furthermore, the metal wire 310 has an outward bend 311 near the front end of the push-pull control tube 500, causing the metal frame 300 to unfold into a cup shape after the outward bend 311.

[0072] Example 4

[0073] Please see Figure 9 .

[0074] The only difference between this embodiment and Embodiment 1 is that the stone retrieval basket mechanism with a transparent film includes an outer tube 200 and a push-pull control tube 500, but does not have a central conduit 100, and the highly transparent film 400 completely wraps the metal frame 300, with no mesh 420 on the surface of the highly transparent film 400.

[0075] Example 5

[0076] Depending on the application scenario and the location of the stones, different stone retrieval basket mechanisms with transparent films can be selected, as detailed below:

[0077] like Figure 10 As shown in Scenario 1: A cup-shaped metal frame 300 is selected. The metal frame 300 can be composed of a few metal wires 310 (such as 4 wires). A highly transparent film 400 has a notch 410 near the front end of the push-pull control tube 500. The unfolded metal frame 300 has an opening diameter of 12mm and a depth of 10mm, which fits the renal pelvis space and can collect multiple stone fragments at one time.

[0078] like Figure 11 As shown in Scenario 2: A cup-shaped metal frame 300 is selected. The metal frame 300 can be composed of multiple metal wires 310 (such as 12 wires). The cup-shaped metal frame 300 has a tip angle of 60°, which facilitates its deep penetration into the lower calyx of the kidney. The umbrella-shaped metal frame 300 can intercept small stones in the lower calyx.

[0079] like Figure 9 As shown in Scenario 3: For large stones (stone diameter > 3cm), a central conduit 100 without a central hole (the stone retrieval basket mechanism with a transparent film in Example 3) is used. The highly transparent film 400 completely wraps the meshless 420, mainly for collection and isolation. During the lithotripsy 900 process, the laser fiber 800 operates outside the metal frame 300. After lithotripsy 900, the entire stone retrieval basket is withdrawn, and the large stones are removed together. Then, the perforated stone retrieval basket is switched on to clean up the small particles.

[0080] The above descriptions are merely five embodiments of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the principles of the present invention, and these should also be considered to fall within the scope of protection of the present invention.

Claims

1. A stone-collecting basket mechanism with a transparent film, characterized in that: It includes an outer tube (200), a central conduit (100), a push-pull control tube (500), a skeleton with shape memory function (300), and several films (400); The central catheter (100) is fitted inside the push-pull control tube (500), which in turn is fitted inside the outer tube (200); The rear end of the skeleton (300) is fixedly connected to the front end face of the push-pull control tube (500), and several films (400) are fixed on the skeleton (300); The push-pull control tube (500) can pull the skeleton (300) in and out of the gap between the central conduit (100) and the outer tube (200). After the skeleton (300) extends out of the front side of the outer tube (200), the skeleton (300) unfolds outward in the circumferential direction of the outer tube (200). When the skeleton (300) extends into the inner hole of the outer tube (200), the skeleton (300) and the membrane (400) fold into a bundle and can be accommodated in the annular gap between the outer tube (200) and the central conduit (100).

2. The stone-collecting basket mechanism with a transparent film according to claim 1, characterized in that: The skeleton (300) includes several metal wires (310) with shape memory function. The two ends of the metal wires (310) are fixedly connected to the front end face of the push-pull control tube (500). The metal wires (310) are wound into an arc shape on the front side of the push-pull control tube (500). The several metal wires (310) are evenly distributed around the circumference of the outer tube (200). Any adjacent metal wires (310) are fixedly connected to each other. Several films (400) are fixed on the several metal wires (310) of the skeleton (300).

3. The stone-collecting basket mechanism with a transparent film according to claim 2, characterized in that: The metal wire (310) has an outward bend (311) near the front end face of the push-pull control tube (500).

4. The stone-collecting basket mechanism with a transparent film according to claim 2, characterized in that: The metal wire (310) is selected from nickel-titanium alloy wire or high-elasticity stainless steel wire.

5. The stone-collecting basket mechanism with a transparent film according to claim 1, characterized in that: The film (400) has several mesh holes (420) near the front end face of the push-pull control tube (500).

6. The stone-collecting basket mechanism with a transparent film according to claim 1, characterized in that: The film (400) has a notch (410) near the front end face of the push-pull control tube (500).

7. The stone-collecting basket mechanism with a transparent film according to claim 1, characterized in that: The film (400) is a transparent film.

8. The stone-collecting basket mechanism with a transparent film according to claim 7, characterized in that: The film (400) can be an optical-grade BOPET high-transparency film or a TPU high-transparency film with good light transmittance.

9. The stone-collecting basket mechanism with a transparent film according to claim 1, characterized in that: The central conduit (100) has an inner hole through which the laser fiber (800) can pass.

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