59 results about "Dormia basket" patented technology

The invention relates to a covered basket type ureteral calculus blockage extractor provided with a catheter and a guide wire. The far end of the guide wire is provided with a basket wire made of shape memory and super elastic material, the far end of the basket wire is gathered to form a basket, and the basket is fixed to a blocking film in a scoop shape in a pre-shaped manner; during usage, the basket wire is in a curved shape, and the blocking film is unfolded through the basket wire; during idle, the basket wire and the blocking film are both accommodated in the catheter. The covered basket type ureteral calculus blockage extractor can be placed in the ureter easily, is prevented from pushing calculus to move reversely towards kidneys and damaging the wall of the ureter and is capable of blocking the ureter completely, the calculus and calculus pieces are prevented from returning to the kidney through injected water effectively, the covered basket type ureteral calculus blockage extractor is not prone to deformation during calculus drawing and extraction, is prevented from friction with the wall of the ureter and is capable of extracting all calculus once, and the purpose of extracting calculus effectively is achieved.

The invention discloses a thrombus breaking and collecting mechanism of a thrombus capturing and removing catheter device, and belongs to the field of vascular intervention medical instruments. The mechanism comprises a three-way suction connector, a suction inner tube, a two-way outer tube connector, an outer tube, a self-expansion net basket support, a tip cap, a guide wire guide tube and a separator; the far end of the three-way suction connector is in sealed connection with the near end of the suction inner tube, the far end of the two-way outer tube connector is in sealed connection withthe near end of the outer tube, and the inner tube is inserted into the outer tube. The mechanism further comprises a self-expansion net basket support, a tip cap, a guide wire guide pipe and a separator. The separator is arranged at the far end of the catheter device, thrombus can be split and guided into the suction catheter, and the risk that the thrombus blocks the suction opening is reduced;the self-expansion net basket support arranged near the suction opening can scrape wall-attached thrombus, and the thrombus taking-out rate is increased; meanwhile, the self-expansion net basket support can collect thrombus, the thrombus is prevented from escaping to the far end, and the occurrence rate of operative complications is reduced.

Catheter-delivered endovascular medical devices are described. The devices may include a pull wire attached to a deployable dual basket system. The deployable dual basket system may include a proximal basket and a distal basket that are connected by basket connector tether memory metal strips that rotate / twist relative to the longitudinal axes of the basket and form flex points of the system. The proximal basket and the distal basket may be comprised of a plurality of cells and the proximal basket may taper at its proximal end and the distal basket may be tapered at its distal end. Methods of using and making the devices are also described.

The invention relates to the technical field of medical instruments, and discloses a net basket type thrombus removing device. The device comprises a far-end filtering disc, a near-end recycling discand at least one middle thrombus taking disc; the far-end filtering disc can be elastically expanded in the radial direction, and is provided with a net-shaped structure; the far-end filtering disc, the middle thrombus taking disc and the near-end recycling disc are sequentially and coaxially connected; in a natural unfolding state, the middle thrombus taking disc is in a flat disc shape; and thediameter of the middle thrombus taking disc is larger than that of the far-end filtering disc. According to the embodiment of the invention, a rapid, safe and effective thrombus removing mode can be provided for embolism treatment of pulmonary artery embolism and other large-size and thrombus-amount embolism, so that the treatment effect of acute middle-high risk pulmonary embolism patients can beimproved.

The invention discloses an intravascular thrombus suction catheter device and a mesh basket assembly thereof, and belongs to the field of vascular intervention medical treatment. The device comprisesa three-way connecting base, a catheter, a connecting base and a conveying sheath tube, and further comprises an expandable guide head end and a self-expansion mesh basket assembly. The self-expansionmesh basket assembly consists of a mesh basket conveying pipe, a hammer-like guide cap, a mesh basket supporting pipe and a self-expansion mesh basket, wherein the mesh basket conveying pipe is inserted into the catheter, the hollow hammer-like guide cap is arranged at the far end of the mesh basket conveying pipe, the mesh basket supporting pipe is inserted into the mesh basket conveying pipe, and the self-expansion mesh basket is fixed to the far end of the mesh basket supporting pipe. The hammer-like guide cap serving as a thrombus breaking separator is arranged at the suction opening in the head end of the far side of the catheter and used for breaking and separating thrombus blocked at the suction opening of the suction catheter; and the self-expanding mesh basket is arranged at thefar end of the lesion thrombus and used for scraping and collecting thrombus tissue attached to the wall of a blood vessel, and besides, the collected thrombus tissue is pushed to the position near the suction opening in the near end of the suction catheter.

The invention relates to an internal extracting device for calculus cavities of urinary systems. The internal extracting device comprises a guide tube and a guide wire. A net basket is arranged at a far end of the guide wire, a calculus extracting pocket is fixed onto the net basket and is in the shape of an elongated pocket by means of pre-plasticizing, an opening is formed in a surface of a near end of the calculus extracting pocket, and tiny holes are further formed in the calculus extracting pocket. The internal extracting device for the calculus cavities of the urinary systems has the advantages that large quantities of broken calculi, blood clots and pus clots can be extracted by the internal extracting device at one step, the internal extracting device is free of constraints of the inner diameters of the lumens of the ureters or the inner diameters of operation channels, broken calculus missing in calculus extracting procedures can be prevented, and the broken calculi can be effectively prevented from being poured into the kidneys by water current; injury to the walls of the ureters due to the broken calculi can be prevented, and accordingly the internal extracting device is safe and reliable.

The invention relates to a three-wire variable-range calculus retrieval mesh basket device. The three-wire variable-range calculus retrieval mesh basket device comprises a control handle and a sheathtube arranged on the control handle, wherein a mesh basket is connected to the sheath tube; the mesh basket is unfolded or contracted through operation of the control handle; when the mesh basket is unfolded, the mesh basket is in a triangular cone shape, and the bottom face of the mesh basket is in an opening shape; and when the mesh basket is contracted, the calculus retrieval mesh basket is integrally contracted into the sheath tube. Compared with a four-wire mesh basket, the three-wire variable-range calculus retrieval mesh basket device has the advantages that calculi in a body can be more conveniently and accurately grasped without injuring blood vessels. On the basis of the three-wire structure, the applicant, namely, a company, abandons a mesh basket with a fixed specification andadopts a variable-range design, the calculus retrieval mesh basket does not need to be frequently replaced for calculi with different sizes and different structures in the operation process, the maximum unfolding degree of the mesh basket is directly adjusted and changed through the handle, and the calculi can be removed at a time, so that the operation efficiency is improved, and the pain of a patient is greatly relieved.

The invention discloses a three-mirror combined minimally invasive gallbladder-preserving stone removal operation, which relates to medical equipment and is used to solve the problem that the existing stone removal mesh basket will touch the inner wall of the gallbladder, and the operation process is prone to pain, trauma, bleeding, and cannot collect gallbladder stones. , flushing, imaging and expansion in one. It includes a stone extraction basket, a choledochoscope, a laparoscope, and a duodenoscope. The stone extraction basket includes a catheter, a hollow guide head positioned at the left end of the catheter, and a wire basket positioned on the guide head. The wire basket includes at least 2 first net baskets, at least 2 second net baskets, the conduit includes outer tubes, sliding tubes, inner tubes and sliding couplings arranged from outside to inside, the sliding couplings include first terminals, second The terminal is used to connect the coupling shaft of the first terminal and the second terminal. The retractable mesh basket design prevents the stone extraction mesh basket from touching the inner wall of the gallbladder. There is no pain, trauma, or bleeding during the operation, and it can integrate gallbladder stone extraction, washing, imaging, and expansion.

The invention discloses a controllable novel capsule endoscope. The capsule endoscope comprises a capsule endoscope body, a control device and a retractable net basket; the control device includes a connecting line and a connecting pipe, one end of the connecting line is connected with a three-way valve, the other two ends of the three-way valve are connected with an inflation device and a deflation valve respectively, the connecting pipe is arranged at the other end of the connecting line, the connecting pipe includes an internal pipe and an external pipe, an annular first clamping groove is formed in the inner side wall of the internal pipe, a first piston in the first clamping groove can slide in a vertical direction along the bottom of the first clamping groove, a first push rod is connected with the bottom surface of the first piston, and a flange is arranged on the outer wall of the internal pipe in a sleeving mode; the internal pipe is arranged in the external pipe in a sleeved mode through a through hole in the top surface of the external pipe, a spring is arranged on the outer side of the internal pipe in a sleeving mode, and the two ends of the spring are connected with the inside of the top surface of the external pipe and the top surface of the flange respectively; the retractable net basket is connected with the bottom surface of the external pipe, and the capsule endoscope body is pocketed in the retractable net basket. According to the controllable novel capsule endoscope, extra advancing power can be provided for the capsule endoscope body, and the position and time of the capsule endoscope body in a digestive system can be controlled.

The invention provides a medical handle and a calculus taking mesh basket system. The handle comprises a first lateral part, a body, a second lateral part, a core shaft and a push mechanism; the core shaft is arranged in the body; the first lateral part is located at one side of the body, and is connected with the core shaft, and the second lateral part is located at the other side of the body, and is connected with the body; the first lateral part, the core shaft, the body and the second lateral part are provided with cavities which are communicated with one another and coaxial and used for accommodating the apparatus catheter; the medical handle further comprises a first fastening piece and a second fastening piece; the first lateral part and the core shaft have a first connecting state and a second connecting state; the second lateral part and the body have a third connecting part and a fourth connecting state; the push mechanism is connected with the core shaft, and is used for driving the core shaft to move relative to the body. The calculus taking mesh basket handle overcomes the problem in the prior art that since an operation handle cannot completely exit an endoscope, two or more apparatuses cannot be used simultaneously, which generates great inconvenience to surgery.

The invention discloses cancer embolus taking apparatus. The apparatus includes an external sheath tube, an internal sheath tube, a moving unit and an embolus taking device; the internal sheath tube is movably arranged in the external sheath tube; the moving unit is movably arranged in the internal sheath tube; the embolus taking device is arranged at the end part, located on the same side with the front end of the external sheath tube, of the moving unit; the embolus taking device is made of a memory material which can deform, so that the embolus taking device can have an initial unfolding state of a basket-liked structure when the embolus taking device is located at the external of the internal sheath tube, and have a contraction state when the embolus taking device is located in the internal sheath tube; and a catcher is also arranged into a device that, at the initial unfolding state, the opening of the basket-liked structure faces toward the moving unit, so that the front end of cancer embolus can be caught. As the external diameter of the apparatus is small when the embolus taking device is located in the internal sheath tube, the performing of an operation can be avoided, percutaneous transhepatic minimally invasive surgery can be adopted, and the apparatus can be adopted to take out the cancer embolus under the circumstance of locating the cancer embolus through B-ultrasound or X-ray.

The invention discloses a high-stability mesh basket for taking out calculus, and belongs to the technical field of medical instruments, the high-stability mesh basket comprises a sleeve, the side end face of the sleeve is fixedly connected with the end face of the close side of a connecting shaft through a mesh basket guide core, and a side plate seat is arranged at the position, corresponding to the connecting shaft, of the inner side of the mesh basket guide core. According to the invention, under the mutual cooperation of the designed structures such as the mesh basket guide core, the connecting shaft, the piston disc, the second sliding sleeve and the elastic supporting device, the problem of difficult conveying at a corner in a pipeline tissue can be avoided, and meanwhile, the mesh basket guide core can conveniently cover the inner stone and conveniently wrap the inner stone, The high-stability mesh basket is good in effect, convenient to use and high in practicability, more internal calculi can be extracted in one-time operation, operation procedures of medical staff are simplified, side effects of treatment of a patient are reduced, the high-stability mesh basket is high in practicability and beneficial to popularization and application, and meanwhile, overlarge compression force on the interior of a pipeline tissue can be avoided.

The invention discloses orthopedic instrument cleaning and disinfection equipment. The equipment comprises a box body; a cleaning tank is installed on the box body; a mesh basket used for containing orthopedic instruments is arranged in the cleaning tank; an adjusting mechanism is installed in the cleaning tank; the mesh basket is connected to the adjusting mechanism in a hung mode; and the adjusting mechanism is used for driving the mesh basket to swing to clean the instruments in the mesh basket. The equipment is simple in structure, reasonable in layout, diverse in function, capable of rapidly cleaning, drying and disinfecting the orthopedic postoperative instruments, high in efficiency and good in effect, and meets the current use requirements.

The present disclosure relates to catheter systems including balloons and infusion baskets designed to be deployable in complex tubing systems for optimal treatment of blood and arterial diseases, such as blood clots, thrombus and deep vein thrombosis. The basket may include a rod having a plurality of cutouts along a portion of its length to form a plurality of bifurcations that provide support to a plurality of perforated tubes, thereby forming branches of the basket. When the longitudinal length of the basket decreases, the branches of the basket expand radially away from the longitudinal axis of the basket. The branches may also be connected to a drug delivery system such that the basket of the present disclosure allows for both mechanical and drug thrombolysis.

A transverse calculus removing mesh basket belongs to the technical field of medical instrument manufacturing. The device comprises an outer sheath tube, a net basket and a traction part. The outer sheath tube is a double-channel tube and comprises a channel 4 and a channel 5; a handle is arranged at the tail of the outer sheath tube; the channel 5 is L-shaped and is connected with a radiography connector on the handle; and threads are arranged on the surface of the connector. The net basket comprises a head, a body and a handle; the head is composed of four steel wires; two ends of the head are connected to form a rhombus shape, an arc shape, a water drop shape or a spiral shape; the body is a steel wire connecting rod and is connected with the four steel wires of the head through the channel 4; the handle is a single-channel metal pipe and is internally provided with a channel 11; and the outer wall of the metal pipe is connected with the steel wire connecting rod. The traction partcomprises a head, a connecting rod and a handle, and the head is a single steel wire. The transverse calculus removing mesh basket has the advantages that formation of the mesh basket can be changed through the traction part, and calculus can be extracted more easily.

The invention relates to a vena cava filter, which comprises recovery hooks at two ends. The recovery hooks are connected with mesh baskets respectively, the two mesh baskets in opposite are connectedthrough ribs, each rib comprises non-degradable sections at two ends and a degradable section, the non-degradable sections are connected with the mesh baskets, and each degradable section is arrangedbetween the corresponding non-degradable section and connected with the same. By a combination structure of each rib with the middle degradable section and the non-degradable section at two ends, thedegradable sections can be completely degraded after the filter is imbedded into a blood vessel; after the degradable sections are completely degraded, the filter is converted into two independent filters, the combination length of the non-degradable sections of the ribs with a blood vessel wall is reduced while the contact area is reduced as well, the residual filters at two ends can be conveniently recovered along the direction of the ribs, and accordingly stability, safety and reliability of the filter can be kept while the residual filters can be recovered simply and conveniently at any time. In addition, the vena cava filter is reasonable in structure, safety, steady, reliable in performance and convenient to operate and use, thereby being an ideal convertible vena cava filter.

The invention relates to the technical field of medical instruments, in particular to a percutaneous transhepatic sinus calculus removing device based on hepatobiliary surgery and a using method thereof. The percutaneous transhepatic sinus calculus removing device comprises a handle, a flushing and sucking device, a storage device and a seepage adsorption device. The flushing and sucking device isarranged on the inner side of the handle, and a sleeve is fixedly connected to the top of the right end of the handle; an inner pipe is slidably connected to the inner side of the sleeve, a push rodis slidably connected to the left end of the outer side of the inner pipe, the push rod is slidably connected with the sleeve, a storage device is arranged at the right end of the sleeve, a seepage adsorption device is arranged on the outer side of the sleeve, a shielding cover is hinged to the left side of the top end of the sleeve, and a net basket is fixedly connected to the right end of the inner pipe. In the invention, through the arrangement of the silica gel sleeve and the auxiliary sleeve, the arrangement is matched with the fixed connection of the silica gel sleeve and the auxiliary sleeve, the trumpet-shaped arrangement of the auxiliary sleeve and the spiral connection of the connecting sleeve and the threaded sleeve, when the device is used, a plurality of stones can be taken out at a time, so that the stone removal efficiency is guaranteed and the stone removal difficulty is reduced. In addition, the device can effectively adsorb flushing water leaking through the sinus tract in the calculus removing operation process, so that pollution to an operation area is reduced. Moreover, the main components in the device can be detached, cleaned and disinfected, and can be repeatedly used, so that the cost is reduced, and the economic burden of a patient is reduced.

The invention provides a lithotripsy basket catheter with a lithotripsy balloon. The lithotripsy basket catheter comprises a catheter e and a connecting rod type basket arranged in the catheter. The catheter comprises a first catheter section, a second catheter section and a third catheter section which are sequentially communicated; a balloon is arranged outside the second catheter section; and aballoon inflation channel and a basket connecting rod channel for displacement are arranged in the catheter. After calculi are taken by the basket, the basket is tightened, and the calculi can be fixed and tightly attached to the lithotripsy electrode at the head end of the catheter. After the balloon is filled, broken calculi can be prevented from entering an intrahepatic bile duct in the calculi breaking process. After the common bile duct calculi are crushed, the broken calculi can be dragged into the common bile duct by using the balloon, or after the common bile duct calculi are crushed,the broken calculi are dragged into the duodenum by using the balloon or the basket. By arranging the lithotripsy electrode, large common bile duct calculi can be subjected to plasma lithotripsy, microelectrode lithotripsy and laser lithotripsy under X-ray, choledochoscope assistance is not needed, and the lithotripsy basket catheter is more suitable for primary hospitals.

The invention provides a projectile type cleaning net basket which comprises a handle assembly, a net basket sheathing canal and a net basket body, the handle assembly is fixedly connected with the net basket sheathing canal, a traction wire is contained in the net basket sheathing canal, the tail end of the traction wire is connected with the front end of the net basket body through a hook lock, and a green coating is arranged on the surface of the hook lock; the handle assembly comprises a hand ring and an extension tube handle, the hand ring is connected with the front end of the net basket body through a traction wire, and the extension tube handle is connected with the hook lock through a coil. By separating the handle from the mesh basket, a plurality of foreign matters in an endoscopic surgery can be packed, and loose and complete masses can be conveniently taken out of the body after being packed, so that the number of times of entering and exiting from the body of a patient is reduced, the pain of the patient is relieved, and the success rate of the endoscopic surgery is improved.

The invention relates to a thrombus taking-out device, which comprises a capturing net basket and a hose fixed to the near end of the capturing net basket, a core wire coaxial with the hose is arranged in the hose, and the core wire is in sliding fit with the hose in the length direction of the hose. The end, facing the catching net basket, of the core wire penetrates through the catching net basket and is in sliding fit with the near end of the catching net basket, the core wire is fixed to the far end of the catching net basket, the catching net basket is made of metal wires with good elasticity, and when the core wire moves towards the far end of the catching net basket, the catching net basket is stressed to be in a funnel shape. The thrombus taking-out device has the advantages that the radial size of the catching net basket after deformation can be changed, so that the thrombus taking-out device adapts to blood vessel environments with different thicknesses, discrete small thrombus in blood vessels can be removed, broken small thrombus blocks are prevented from escaping outwards to other parts of the blood vessels along with blood flow, and damage to the blood vessels is reduced.

The invention provides a calculus fetching mesh basket suitable for the urinary system, and specifically comprises a device body, wherein a connecting device is mounted on the outer side of the device body; a calculus fetching device is slidably arranged on the outer side of the device body, and an auxiliary mechanism is fixedly arranged on the front side of the device body; an adjusting mechanism is fixedly arranged at the bottom of the connecting device; a fixing device is fixedly arranged at the bottom of the adjusting mechanism; a mesh basket device is slidably arranged in the auxiliary mechanism; and an adsorption mechanism is fixedly arranged in the mesh basket device. According to the calculus fetching mesh basket suitable for the urinary system, an adjusting gear is matched with a toothed plate to realize the purpose that a transverse column drives connecting frames to move front and back, the effect of effectively controlling the moving speed of a catheter is achieved, and the effect of preventing a mesh basket piece from moving too fast is achieved.

A medical device used to capture stone fragments. A medical device for capturing one or more stone fragments is disclosed, the medical device comprising a sheath having a proximal end and a distal end, a handle at the proximal end of the sheath, and a device operable with the handle. Net basket. The basket includes a plurality of wires that capture stone fragments and has a contracted configuration when the basket is positioned within the sheath and an expanded configuration when the basket is positioned beyond the distal end of the sheath. The medical device also includes an indicator for communicating the size of the stone fragments beyond a predetermined limit to an operator of the medical device, and a release mechanism for releasing the stone fragments from the plurality of wires when the size of the stone fragments exceeds the predetermined limit. The plurality of wires can be reset to an operable position after release of the stone fragments.

The invention discloses a stone removal basket with a threaded guide head and relates to the field of medical instruments. The stone removal basket comprises a handle, an outer tube fixed at the frontend of the handle and an inner tube arranged in the outer tube, a guide rod is arranged in the inner tube, the front end of the guide rod is connected with a basket, and a driving member used for driving the guide rod to rotate is arranged on the handle; the guide head is arranged at the front end of the basket, and the outer wall of the guide head is provided with a screw thread; a sliding switch connected to the rear end of the inner tube is arranged on the handle. According to the invention, the outer wall of the guide head at the front end of the basket is provided with a screw thread, the guide rod is driven to rotate by the driving member, the guide rod is linked with the guide head to rotate and penetrate stones, the screw thread on the outer wall of the guide head enables the guide head to penetrate the stones more easily when the guide head rotates, and the stones are broken, so that it is convenient for the basket to remove the stones by enclosing.

The invention discloses a calculus removing mesh basket for a choledochoscope, and relates to the technical field of medical auxiliary equipment. The calculus removing mesh basket comprises a supportbase and a calculus removing mesh basket body, wherein the calculus removing mesh basket body is connected with a traction wire, a mesh basket output end is arranged at the tail end of one side, closeto the calculus removing mesh basket body, of a sheath, an adjusting box is arranged on the upper surface of the supporting base, a screw rod is arranged in the adjusting box, a nut is arranged on the surface of the screw rod, a first driving motor is arranged on the surface of the right side wall of the adjusting box, a second driving motor is arranged on the lower surface of the supporting base, one end of the calculus removing mesh basket body is fed into a human body, and an operator controls a control handle to unfold the calculus removing mesh basket and controls the control handle to contract the calculus removing mesh basket to complete calculus removing, the nut drives a right disinfection box to move up and down in the vertical direction, a main gear drives the upper adjusting box and the disinfection box to rotate through an auxiliary gear, a pressure pump conveys a disinfectant to a spray head through a liquid conveying pipe, disinfection of tools is achieved, and the calculus removing mesh basket is more convenient to use and adjust.

The invention discloses a ureter calculus removing device. The device comprises a sheathing canal, an endoscope, an accessory group, a net basket and a handle part, the endoscope is provided with a lens and a cable which are arranged in the sheathing canal; the accessory group is provided with a lens accessory and a cable accessory; the lens accessory is configured to be sleeved on the lens, and the cable accessory is configured to be sleeved on the cable and can relatively move along the cable; the lens accessory interferes with the cable accessory at the far end of the cable; the handle part is provided with an executing mechanism; and the executing mechanism is configured to push the cable accessory towards the near end of the sheathing canal and pull the cable towards the far end of the sheathing canal. The net basket is constructed to be partially pushed into the sheathing canal to be closed when the lens accessory and the cable accessory interfere with each other. According to the calculus removing device, the net basket and the endoscope can be combined, and the necessary distribution space of instruments in the sheathing canal is effectively reduced.

The invention discloses a hepatobiliary surgery calculus taking-out device. The hepatobiliary surgery calculus taking-out device comprises a sheathing canal, a net rope is arranged in the sheathing canal, the two ends of the net rope extend to the outer side of the sheathing canal, and a handle mechanism connected with the net rope is arranged at the tail of the sheathing canal; a basket net is arranged at the front end of the net rope, and a pressing part used for assisting the basket net in crushing calculus is arranged at the end, close to the basket net, of the net rope. Different from the prior art, the hepatobiliary surgery calculus taking-out device has the advantages that in the actual taking-out process of the calculus in the hepatobiliary surgery, especially for large and hard calculus, the pressurizing part can be ejected out of the sheathing canal and is in contact with the calculus by utilizing the net rope, so that a pressurizing mechanism is used for pressurizing to assist calculus crushing in the calculus crushing process of the net basket, the calculus crushing capacity of the calculus taking net basket is effectively improved, and efficient taking and use of the hepatobiliary calculus are guaranteed.

The invention discloses a layered fetching catheter, and relates to the field of medical instruments, and the layered fetching catheter is characterized by comprising a telescopic mechanism, a sleeve and an extraction mechanism which is communicated with the sleeve to control the telescopic mechanism to expand and retract in the radial direction; the telescopic mechanism comprises a plurality of metal wires, each metal wire is of a double-layer structure, and each metal wire is divided into an outer-layer metal wire and an inner-layer metal wire; the telescopic mechanism further comprises a supporting rod for supporting the metal wire to form a claw structure, grooves extending from the top end to one side of the root are formed in the opposite side faces of the supporting rod, and a clamping ring capable of moving up and down is arranged on the inner wall of the supporting rod. The inner-layer metal wire penetrates through the clamping ring and extends outwards to form a claw part structure; the extraction mechanism controls the outer-layer metal wires and the inner-layer metal wires to be linked or independently stretch and expand in a segmented mode, and the clamping ring moves up and down along with movement of the inner-layer metal wires. The invention has the technical effects that the double-mesh basket structure is included, so that small stones can be prevented from falling off.