CN210056217U - Fixed gravel taking basket - Google Patents

Abstract

The utility model discloses a be used for fixed rubble of endoscopic surgery (like ureteroscope art) supplementary medical device to get stone basket, including basket (11), interior sheath pipe (12), sheath (13), action bars (14) and water seal (16), the one end of interior sheath pipe (12) with basket (11) link to each other, the main part of interior sheath pipe (12) is passed behind sheath (13), its other end with action bars (14) with water seal (16) link to each other, interior sheath pipe (12) quilt sheath (13) are wrapped, are provided with steel wire (18) that are used for controlling basket (11) between interior sheath pipe (12) and sheath (13). A guide wire or a lithotripsy device such as a laser fiber can be inserted through the water seal (16), and the device can be fixed. When in use, the stone breaking device can be arranged in the stone breaking device through the inner sheath tube (12) of the fixed stone breaking and taking basket to carry out the operations of stone breaking, stone taking and the like.

Description

Fixed gravel taking basket

Technical Field

The utility model belongs to the field of medical equipment, concretely relates to a novel fixed rubble basket of getting that is used for fixed, the rubble of calculus, gets stone in ureteroscope art, it is further, the basket can also be applied to other fields such as cholecystoscope of hepatobiliary surgery etc. like the rubble, get stone, biopsy and handle foreign matter etc..

Background

The incidence of kidney stones is rising and carries a huge economic burden (Massoudi, Metzner et al 2018). The aim of treating urinary lithiasis is to completely eliminate stones with minimal side effects and to prevent lithiasis complications (Perez Castro, Osther et al 2014, Tseng and primger 2015, Van Cleynenbreugel, Kilic et al 2017). The treatment of kidney stones has progressed from open surgery to minimally invasive surgery, such as percutaneous nephrolithotomy (PCNL) and ureteroscopy. Ureteroscopy is considered a first-line treatment for small to medium-sized stones and is finding increasing use (Lee, Bak et al 2016, Massoudi, Metzner et al 2018). Laser is currently considered to be the most safe and effective treatment, and can be used to pulverize or fragment the calculi (Kroczak, ghoculete et al 2018).

Ureteral stones, especially proximal stones, have been challenging to ureteroscopy treatments by migrating to the renal pelvis or calyx (dreg, von ruddstedt et al 2017, Kroczak, ghicule et al 2018). Since ureteral stone migration can occur during placement of the ureteroscope, irrigation of irrigation fluid, and lithotripsy (Elashry and Tawfik 2012). Retrograde displacement has been reported for 3-5% of distal ureteral stones (Hendrikx, Strijbos et al 1999, Pardalidis, Kosmaoglou et al 1999) and 28-48% of proximal ureteral stones (Robert, Bennani et al 1994, Knispel, Klan et al 1998, Chow, Patterson et al 2003, Osorio, Lima et al 2007, Tunc, Kupeli et al 2007, dreg, von Rundstedt et al 2017). The displacement rates for breaking up the upper stones with the bomb and the laser were up to 48(Dretler 2000) and 33% (Kroczak, Ghicule et al 2018), respectively. The migration of stones into the kidney clearly increases the operation time, the need for other therapeutic measures such as ureteroscopy, the increase in the number of operations, the decrease in the stone-free rate and the increase in the costs (dreg, von rundstdt et al 2017, Kroczak, ghicule et al 2018).

To prevent dislodgement of stones, stone blocking devices are commonly used in the prior art. As in clinical practice, a ureteroscope enters the ureter with the aid of a guidewire. After the Stone is observed, the guidewire is withdrawn and an intercepting device (such as Ncage and Stone Cone) is placed over the Stone via the working sheath of the ureteroscope to prevent upward displacement of the Stone. In addition, the interception device can play a role in fixing, so that the physiological activity of the ureter along with respiration and the like is offset, and the lithotripsy is facilitated (Maislos, Volpeet al.2004). Several displacement prevention related devices have been developed and used to optimize ureteroscopy (Kroczak, Ghiculete et al 2018), such as suction devices (Delvecchio, Kuo et al 2000), balloon catheters (Dretler2000, Dellabella, Milanese et al 2007), Guidewire coiling techniques (guided wire-Coil-Technique) (dreg, von ruddstend et al 2017), Stone Cone (Desai, Patel et al 2002), glue-containing devices (Ali, Ali et al 2004, Mohseni, Arasteh et al 2006), and invasive percutaneous balloons, among others. For example, Kroczak et al (Kroczak, Ghicule et al 2018) report that stones are captured with a basket, then the stones are powdered with a laser, and the remaining small stones are removed with the basket. When the calculus is taken out after the calculus is broken, the calculus should be taken out smoothly all the time. However, when the basket is used, the calculus may be embedded in the ureter, or when the basket is used for displacing the calculus in the operation, the calculus is clamped in the ureter or the calyx neck, so that the basket is loosened and the calculus cannot be released. The most serious complication that can arise if the procedure is not performed properly during surgery is ureteral avulsion (Lee, Bak et al.2016). It may be difficult to reinsert the working channel into other lithotripsy devices such as laser fibers. These not only increase surgical time, but also increase surgical risk (Lee, Bak et al.2016). This situation requires continued lithotripsy to make the stones smaller or crushed. However, due to the restriction of the working channel, the laser fiber cannot pass through the soft lens and exits the ureteroscope with difficulty (Cornu, Herrmann et al.2016). At this point it is necessary to cut the basket, exit the ureteroscope, pass next to the basket again and enter the ureteroscope and break the basket with a holmium laser (Cornu, Herrmann et al.2016).

In order to reduce the effects of intraoperative instrument changes and repetitive manipulations on stones, certain improvements have been made to address the above problems. The existing stone breaking and taking basket is additionally provided with a channel beside a basket sheath. This facilitates placement of a guide wire and use of the guide wire to guide the basket into a more angularly oriented target lumen (e.g., from the duodenum into the common bile duct) to improve the success rate of passage and also reduce damage to the wall of the duct by the basket. It can also be crushed by a stone crushing device. As shown in figure 1, the double-channel stone breaking and taking basket (patent number: ZL02230606.4) disclosed in 2003 of Zeng Xianzhong, et al, comprises a push-pull handle 1, a sleeve 3, a conveying pipe 5 and a stone taking basket 7, wherein the sleeve 3 is provided with a side pipe 4, a steel wire 2 is arranged in the conveying pipe 5, one end of the steel wire 2 penetrates through the sleeve 3 to be connected with the push-pull handle 1, and the other end of the steel wire 2 is connected with the stone taking basket 7. Is characterized in that an inner tube 6 is arranged in the conveying pipe 5, one end of the inner tube 6 is communicated with the side tube 4, and the stone crushing equipment is inserted into the inner tube 6 through the side tube 4. As shown in fig. 2, the calculus breaking and removing integrated basket (patent number: ZL201220472932.2) with guide wires disclosed in 2012 of zhu shou liu et al includes a basket 1, guide wires 2, guide wire holes 3, a metal sheath tube 4, a plastic sheath tube 5 and side holes 6. Is characterized in that the top end of the basket 1 is provided with a thread guide hole 3, the thread guide cavity is divided into a metal outer sheath tube 4 and a plastic outer sheath tube 5, a thread guide 2 enters the metal outer sheath tube 6 from a side hole 6 on the wall of the metal outer sheath tube 4 at the position of 10mm of the front end of the thread guide cavity of the plastic outer sheath tube 5, and then enters the thread guide hole 3 through the basket 1. The prior art of the above improvements are all to lithotript by adding channels to accommodate lithotripter devices or guide wires to guide a lithotripter basket into a target location. The channel can only pass through one of a guide wire and a laser, wherein the guide wire guides the basket to advance, and the laser is used for carrying out lithotripsy. The added channels are in parallel relationship with either the original cannula 3 (fig. 1) or the metal sheath 4 (fig. 2). Especially, the added inner tube 6 and the delivery tube 5in FIG. 1 are always in parallel relationship, and the non-coaxial relationship is easy to shift the guide wire, can not point to the axial direction of the target duct accurately and even can be misguided, so that the surrounding tissues are easy to be damaged or the calculus is easy to be displaced, and the lithotripsy is also caused especially when the narrow lacuna, the incarceration calculus and the circuitous ureter are passed (patent No. ZL 201220472932.2). Although the additional plastic sheath 5 of fig. 2 communicates with the metal sheath through the side holes 6, this interposed design will certainly increase the friction between the devices inside the plastic sheath 5 and the metal sheath 4. Usually, when the calculus breaking and taking basket is difficult to pass through, such as large-angle and incarceration calculus, the soft-head ultra-smooth guide wire is firstly arranged, and the calculus breaking and taking basket can be guided to pass through after the guide wire passes through. Currently, a common guide wire is characterized in that a small section at the front part is soft while most parts at the back part are hard materials. When the hard guide wire at the back passes through the side hole 6, the resistance can be increased and even the basket at the front can be twisted, the smoothness between the devices can not be ensured in use, and the operation difficulty can be increased. In addition, the main body of the calculus and lithotripsy basket is also relatively soft, and if the front resistance is increased when the calculus and lithotripsy basket is pushed along the guide wire, the basket is difficult to advance and even deforms.

The above analysis of the prior art can find that the technical problems of the methods also include the following aspects:

(1) current arresting devices such as arresting baskets or Stone con require replacement of the instruments in the working channel in preparation for entry through the endoscope working channel into the ureter above the Stone. Since the ureteroscope is usually guided by a guide wire during the ureter entry process, the guide wire is withdrawn from the working channel before the blocking device is inserted when the ureteroscope is found and is ready to be inserted, i.e. the limited working channel space usually can only accommodate one device, and the interference of the above operations on the calculus can cause the calculus to be displaced and the optimal time for inserting the blocking device is missed. The harder arresting device tends to push the stone back into the kidney.

(2) After the existing intercepting device such as the intercepting basket and Stone Cone catches or intercepts the stones, a lithotripsy device such as a laser fiber needs to be placed in the limited working channel of the ureteroscope again, so that the perfusion is difficult, the visual field is difficult to clean, and at the moment, good perfusion is needed to maintain a clear visual field (Maislos, Volpe et al 2004, Kroczak, Ghicule et al 2018, Wang, Sun et al 2019).

(3) The space between the ureteroscope working channel and the basket is limited, the thinnest optical fiber such as a 200um optical fiber needs to be arranged, but the 200um optical fiber is not popularized, the requirement on laser equipment is high, and the actual use difficulty is large and the application is not wide.

(4) For the ureter with a small working channel, the lithotripsy device cannot be placed again after the basket is placed.

(5) The angle between the implanted lithotripsy device such as the laser fiber and the basket, and the distortion of the ureter and the like make the lithotripsy difficult and easily damage the basket, so that the calculus is displaced again and the operation fails.

(6) Because the angle between the stone breaking device and the basket can not be used for breaking stone accurately, the angle between the stone breaking device and the basket needs to be adjusted ceaselessly so that the operation is complicated, the ureter is easily damaged, and even the basket is damaged to cause stone displacement. (Elashry and Tawfik2012, dreg, von Rundstedt et al 2017, Wang, Sun et al 2019).

(7) In the prior art improvements there is also the disadvantage that the rock breaking device and basket are in a side-by-side relationship or the resistance is increased.

In view of the above, in view of the problems in the prior art, it is particularly important to design a device capable of safely preventing stone displacement to improve the success rate of ureteroscopy for treating upper urinary tract stones.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that exists among the prior art, the utility model provides a stone basket is got to fixed rubble, including basket, interior sheath pipe, epitheca, action handle and water seal, the one end of interior sheath pipe with the basket links to each other, the main part of interior sheath pipe is passed behind the epitheca, its other end with the action handle with the water seal links to each other, interior sheath pipe quilt the epitheca wraps, is provided with the steel wire that is used for controlling the basket between interior sheath pipe and the epitheca.

The net basket is composed of four or two metal wires, and can be a grabbing basket with an open front, a net basket or a spiral shape.

The metal wire is uniformly fixed on the periphery of the inner sheath tube and is connected with the steel wire parallel to the inner sheath tube, the metal wire can be a nickel-titanium alloy wire, and the steel wire can be a stainless steel wire.

The rear end of the steel wire is connected with a push handle of the operating handle, and the opening and closing of the basket can be controlled and the grabbing of the calculus can be realized through the sliding of the push handle.

The basket can be tightened by the push handle of the operating handle, and the calculus can be continuously collected in front of the inner sheath tube to complete the calculus crushing process.

And a guide wire or a laser optical fiber for breaking stones is arranged in the water seal.

The laser can adopt holmium laser, the water seal can be a rubber small cap to prevent flushing liquid from flowing out, and can also be a rotary water seal with an O-shaped rubber pad, and the rotary water seal can play a role in preventing water and fixing a device in an inner sheath tube when being screwed down.

One section of the inner sheath may be made of nitinol and the other section may be made of stainless steel.

The baskets may have a length of about 0.95 to 1.05cm, preferably about 1cm, and a diameter of about 0.95 to 1.05cm, preferably about 1cm, when open, i.e., the baskets are substantially uniform in length and diameter when open.

The wires forming the basket are attached foremost to a circular opening having a diameter corresponding to or equal to the diameter of the inner sheath, and when tightened, the basket opening is positioned in front of the inner sheath opening, which allows the passage of the device inside the inner sheath without affecting the opening and closing of the basket.

The length of the outer sheath can be 100-120cm, preferably about 110cm, the diameter can be 0.90-1.10mm, preferably about 1mm, the circumference can be about 3Fr, the diameter of the lumen of the inner sheath can be 0.89-0.95mm, preferably about 0.90mm, and the inner circumference can be about 2.7 Fr.

The front part of the sheath is about 3cm made of nickel-titanium alloy, and the rear part of the sheath is made of at least one of fluorinated ethylene-propylene copolymer, polyimide or polytetrafluoroethylene.

The technical effects of the utility model include following several aspects:

(1) can fix and intercept the calculus more quickly and effectively. The utility model discloses can pass through the seal wire in the inner sheath pipe of device to can get into ureteroscope in the lump with the seal wire. Because the soft head in front of the guide wire can cross the calculus or the bent ureter without damaging the ureter, the guide wire can be used for crossing the calculus, and then the novel fixed calculus breaking and taking basket is coaxially pushed along the guide wire along the same trend to prevent the calculus from being displaced without withdrawing the guide wire and then placing the calculus into the basket. Especially in cases with ureters above the stones distended and prone to dislodgement, the reduction procedure is an important step in preventing dislodgement of stones.

(2) Can reduce the risk of ureteral injury. When the soft-head guide wire is firstly used for crossing over the calculus, particularly when the calculus is incarceration, the gap between the calculus and the ureter is small, and the guide wire can safely pass through the calculus without damaging the ureter such as ureter perforation and the like. And is coaxially arranged along the guide wire, the utility model can avoid or obviously reduce the damage of the ureter. This avoids the possibility of ureteral trauma such as perforation, etc. that would occur if the guidewire was withdrawn before the retention device was inserted, i.e. the basket was inserted after the guidewire. Although the blocking device can be placed after a gap between the calculus and the ureter is exposed after partial calculus breaking, calculus displacement is easy to occur in the calculus breaking process, and the ureter is thermally damaged due to heat generated by laser. The utility model discloses can allow the guide wire to pass through in the inner sheath of device, cross behind the calculus safely along the coaxial advance of guide wire again, can reduce ureter damage risk.

(3) Can improve the operation safety. Laser fiber warp the utility model discloses the coaxial entering of the inner sheath pipe of device, rubble in-process laser is difficult for damaging ureter and basket all the time in the "basket" that the basket wire encloses. Especially when the basket is embedded with the stone, the surrounding tissues are easy to damage the surrounding tissues and the equipment if the prior equipment such as the basket of Boston Scientific and the basket shown in figure 1 is used, and the utility model can avoid the defects and reduce the operation complications.

(4) The stone breaking efficiency can be improved. The laser fiber is passed through the utility model discloses the inner sheath pipe of device carries out the rubble. In the stone breaking process, the stone is always fixed in front of the inner sheath tube by tightening the basket. In addition, the optical fiber does not need to be stretched out too much during laser stone breaking, and the limitation of the inner sheath tube on the swing amplitude of the laser optical fiber enables the optical fiber stone breaking to be more stable and better in controllability. Therefore, repeated operation, angle adjustment and the like can be reduced during stone breaking, the operation time can be saved, and the stone-free rate can be improved.

(5) Can improve the stone-free rate after operation. Holmium laser can pulverize the stones to <1mm and even to powder. Stones smaller than 4mm are usually able to be expelled by themselves, so stones smaller than 4mm are called clinically insignificant stones. Because the calculus is continuously tightened in the basket for the basket, the calculus in the basket is powdered by the laser fiber, the broken small calculus is washed away by water flow, and when the calculus in the basket is smaller than the diameter of the ureter, the basket is continuously tightened and is withdrawn together with the endoscope body, namely the calculus is taken out. The process of searching for larger residual calculus is omitted, the condition of omission of the larger calculus is avoided, and the stone-free rate can be obviously improved.

(6) Other potential technical effects include shorter procedure time, lower stone displacement rate, ultimately higher procedure success rate, lower cost, reduced risk of infection, etc. due to ureteral injury, reduced bleeding, clearer vision, higher lithotripsy efficiency.

Drawings

FIG. 1 is a schematic view of a dual port rock breaking and retrieving basket of the prior art;

FIG. 2 is a schematic view of another dual port rock breaking and retrieving basket of the prior art;

fig. 3 is a schematic view of a fixed stone breaking and taking basket according to an embodiment of the present invention;

fig. 4 is a schematic view of a basket to which a stone breaking and taking basket is fixed according to an embodiment of the present invention;

fig. 5 is a schematic view of the basket for fixing the stone breaking and taking basket according to the embodiment of the present invention after being opened.

Detailed Description

As shown in fig. 3, the structure of the fixed gravel basket according to the present invention is schematically illustrated. The fixed gravel and stone taking basket comprises a basket 11 at the front end, an inner sheath pipe 12, an outer sheath 13, an operating handle 14 and a water seal 16. The inner sheath tube 12 is connected to the basket 11 at the front end, and the main body of the inner sheath tube 12 passes through the entire outer sheath 13 and is connected to the operating handle 14 at the rear end. The sheath 13 has a length of 110cm, a diameter of 1mm and a circumference of 3Fr (3 Fr: 1 mm). The inner sheath tube 12 had an inner diameter of 0.90mm and an inner circumference of 2.7 Fr. The anterior segment, e.g., 3cm forward, of the inner sheath 12 can be made of nitinol (e.g., nitinol mesh or nitinol wire coiled into a cylinder) whose flexible and non-deformable characteristics do not affect the bending of the ureteroscope and the passage of the device. The inner sheath 12 may be a long cylinder shape having a circular cross section. The rear section of the inner sheath tube 12 may be made of stainless steel mesh, stainless steel wire, or the like to maintain its cylindrical shape which is not easily deformed. The first 3cm of the sheath 13 may also be made of nitinol, and the rear made of Fluorinated ethylene propylene copolymer (FEP), polyimide, or teflon, to maintain the strength and flexibility of the sheath, to maintain smooth operation, and to reduce tissue damage.

Between the inner sheath 12 and the outer sheath 13, a steel wire 18 for controlling the basket 11 passes through, and a groove for accommodating the steel wire 18 is arranged inside the outer sheath 13. The inner sheath 12 and the outer sheath 13 may be flexible, rigid, or a combination of flexible and rigid for use with different instruments. Commonly used guidewires have diameters of 0.035in and 0.038 in. The diameter of the 0.035in guidewire is 0.89mm (1in 25.4 mm). The inner sheath 12 can accommodate a 0.035in guidewire. The current commercially available stone extraction baskets and intercepting nets are also 110cm in length, the working channel of hard ureteroscopes is usually around 5Fr (e.g. Karl Storz, Germany) (dreg, von rundstedt et al 2017), and the working channel of most ureteroscopes is 3.6Fr (1.2mm) (Bagley 2002). The utility model discloses a fixed rubble stone basket can be applied to most half hard ureteroscope and the soft mirror of ureter.

The basket 11 can be composed of four metal wires such as four nickel-titanium alloy wires, the four nickel-titanium alloy wires are respectively and uniformly fixed on the periphery of the inner sheath tube 12 and are connected with four steel wires 18 parallel to the inner sheath tube 12, the rear ends of the four steel wires 18 are connected with a push handle 15 of the operation handle 14, the opening and closing of the basket 11 can be controlled through the sliding of the push handle 15, and the grabbing of the calculus can be realized. The inner sheath tube 12 is surrounded by the outer sheath 13, and the rear end of the inner sheath tube 12 is communicated with a water seal 16. A guide wire, a laser fiber and other lithotripsy devices can be arranged in the water seal 16. The laser may be a holmium laser. The water seal 16 may be a rubber cap to prevent the flushing liquid from flowing out, or a rotary water seal with an O-shaped rubber pad, which can be screwed tightly to prevent water and fix the device inside the inner sheath tube 12. When the calculus removing device is used, if the calculus is to be grabbed and fixed, the position in front of the guide wire is kept unchanged when the guide wire passes over the calculus, the rear end of the guide wire penetrates through the opening 17 of the closed basket 11 to enter the inner sheath 12, then the guide wire is coaxially pushed along the guide wire, penetrates through the whole inner sheath 12 and penetrates out through the water seal 16, and the guide wire is continuously pushed until the closed basket 11 passes over and reaches the position above the calculus. The guide wire can be withdrawn or completely withdrawn, and the basket 11 is opened and closed by sliding the push handle 15 to complete the grabbing of the concretion. Thus, not only can the displacement or escape of the calculus be prevented, but also the influence of human body physiological movement such as respiratory movement can be resisted, and the 'fixation' of the calculus is completed; if the stone is crushed and taken, when the basket 11 successfully grabs the stone and completely withdraws from the guide wire, the stone crushing equipment such as a laser fiber is placed through the water seal 16, and the stone is crushed from the inner sheath tube 12 to the basket 11. The basket 11 can be tightened by the push handle 15 of the operating handle 14, and the calculus can be continuously collected in front of the inner sheath tube 12 to complete the calculus crushing process. Because the laser can crush or dust calculus, the crushed calculus is continuously washed away by water flow, and when the diameter of the calculus in the basket 11 is smaller than that of the ureter, the calculus can be directly taken out of the body through the basket 11. Other residual calculi can be discharged automatically after the operation.

As shown in fig. 4, the front schematic view of the basket of the stone breaking and taking basket according to the present invention. Wherein, the four alloy wires of the basket 11 are connected with a round opening 17 at the forefront, and the diameter of the opening 17 is equal to or equal to that of the inner sheath 12. When tightened, the openings 17 of the basket 11 are positioned in front of the openings of the inner sheath 12, and the openings 17 allow the passage of devices such as guidewires and the like through the inner sheath 12 without affecting the opening and closing of the basket 11. Optionally, the basket 11 is not limited to the composition mode of four alloy wires, and may also be in other numbers and forms, for example, the rear end of the basket 11 is provided with two alloy wires, the front of each of the two alloy wires is divided into 2 pieces, that is, the front half of the basket 11 is provided with four alloy wires, and the rear half is provided with two alloy wires. Accordingly, the number of wires 18 parallel to the inner sheath tube 12 may be four, two, etc. The basket 11 may also be other shapes such as open-front grab baskets, baskets or even spiral shapes. The baskets 11 may have a length of 1cm and a diameter of about 1cm when open.

As shown in fig. 5, the net basket for fixing the gravel basket according to the embodiment of the present invention is opened. Wherein, the steel wire 18 for controlling the opening and closing of the net basket 11 is positioned between the inner sheath 12 and the outer sheath 13 instead of being positioned in the inner sheath 12. The basket 11 and the distal end of the inner sheath tube 12 are in a "wrapped" relationship. The four nitinol wires of the basket 11 are connected to four steel wires 18, respectively, and the steel wires 18 run between the inner sheath tube 12 and the outer sheath 13. Optionally, the four nitinol wires may be connected to the four steel wires 18, or may be in other forms, such as four nitinol wires connected to two steel wires. The steel wire may be a stainless steel wire.

The utility model discloses a stone basket is got to fixed rubble mainly is applied to ureteroscope rubble, nevertheless not only limits to this, and he still is applicable to other scope operations, such as scope operations such as cholecystoscope, bronchoscope like tissue biopsy, foreign matter take out etc..

The utility model discloses a fixed rubble stone basket, for prior art's main improvement include following several aspects:

(1) the inner sheath pipe in the basket main part of prior art holds the steel wire that the control basket opened and shut and is dedicated, and the utility model provides a basket moves the steel wire of control basket to inner sheath pipe all around, and inner sheath pipe is used like seal wire and laser fiber for other equipment.

(2) The utility model discloses an operating handle at middle main part and rear is run through to interior sheath pipe, and basket the place ahead has the opening the same with interior sheath pipe diameter, and the activity of the intraductal device of interior sheath, change etc. are more smooth and easy, do not receive ureteroscope working channel's restriction.

(3) All devices in basket and the inner sheath are coaxial parallel, impel along the seal wire the utility model discloses a can reduce the damage to the tissue on every side and the interference to the knot stone during device.

(4) When the stone is broken, the basket continuously receives the stone to the front of the inner sheath tube, the arms of the basket are distributed around the stone, the laser is positioned in the basket, the stone can be broken more accurately, the step of continuously adjusting the angle of the laser optical fiber is reduced, and the risk of peripheral damage and basket damage is reduced.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (12)

1. A fixed gravel and stone taking basket comprises a basket body (11), an inner sheath pipe (12), an outer sheath (13), an operating handle (14) and a water seal (16), wherein one end of the inner sheath pipe (12) is connected with the basket body (11), after a main body of the inner sheath pipe (12) penetrates through the outer sheath (13), the other end of the inner sheath pipe is connected with the operating handle (14) and the water seal (16),

the inner sheath (12) is surrounded by the outer sheath (13), and a steel wire (18) for controlling the basket (11) is arranged between the inner sheath (12) and the outer sheath (13).

2. The stone basket of claim 1,

the net basket (11) is composed of four or two metal wires, the rear of each metal wire is connected with the steel wire (18), and the net basket (11) is a grabbing basket, a net basket or a spiral shape with the front opened.

3. The stone basket of claim 2,

the metal wires of the basket (11) are connected with the steel wires (18) parallel to the inner sheath tube (12), the metal wires of the basket (11) are nickel-titanium alloy wires, and the steel wires (18) are stainless steel wires.

4. The stone basket of claim 3,

the front end of the steel wire (18) is connected with the rear end of the metal wire of the basket (11);

the inner side of the outer sheath (13) is provided with a groove capable of accommodating the steel wire (18), and the steel wire (18) runs between the outer side of the inner sheath tube (12) and the groove of the outer sheath (13);

the rear end of the steel wire (18) is connected with a push handle (15) of the operating handle (14), and the steel wire (18) is driven to slide back and forth by the sliding of the push handle (15) so as to control the opening and closing of the basket (11) and realize the grabbing of the calculus.

5. The stone basket of claim 4,

the basket (11) can be tightened through the push handle (15) of the operating handle (14), and the calculus is continuously collected in front of the inner sheath tube (12) to complete the calculus breaking and removing process.

6. Basket according to one of claims 1 to 5,

the water seal (16) can be used for placing a guide wire or lithotripsy equipment for guiding the endoscope and the lithotripsy basket to advance, and the lithotripsy equipment is a laser optical fiber.

7. The stone basket of claim 6,

the guide wire is soft-headed and provided with a hydrophilic coating,

the laser adopts holmium laser, and the water seal (16) is a small rubber cap to prevent flushing liquid from flowing out, or is a rotary water seal with an O-shaped rubber pad, and can play the roles of preventing water and fixing instruments in the inner sheath tube (12) when being screwed down.

8. Basket according to one of claims 1 to 5,

one section of the inner sheath (12) is made of nitinol and the other section is made of stainless steel wire or mesh.

9. Basket according to one of claims 1 to 5,

the length of the net basket (11) is 1cm, and the diameter of the net basket is 1cm when the net basket is opened.

10. Stone basket according to one of claims 2 to 5,

the wires forming the basket (11) are connected to a circular opening (17) at the forefront, the diameter of the opening (17) is equal to or equal to the diameter of the inner sheath (12), and when the basket (11) is tightened, the opening (17) is close to the front of the opening of the inner sheath (12), and the opening (17) allows devices in the inner sheath (12) to pass through without influencing the opening and closing of the basket (11).

11. Stone basket according to one of claims 2 to 5,

the outer sheath (13) has a length of 110cm, a diameter of 1mm and a circumference of 3Fr, wherein 1mm is 3Fr, the inner sheath (12) has an inner diameter of 0.90mm and an inner circumference of 2.7 Fr.

12. Basket according to one of claims 1 to 5,

the front 3cm of the sheath (13) is made of nickel-titanium alloy, and the rear part of the sheath is made of fluorinated ethylene propylene copolymer or polyimide or polytetrafluoroethylene.

Images