CN110251202B - A braided ureteral stone blocking extractor - Google Patents

Abstract

Translated fromChinese

本发明涉及一种编丝式输尿管结石阻挡取出器，设有手柄、管柄、编织管网和内芯，所述的编织管网为若干根金属丝编织而成的管状网且远端覆有膜状结构，编织管网两端分别通过固定组件固定在管柄远端和内芯上；所述的编织管网在管柄的带动下做伸缩运动；所述编丝式输尿管结石阻挡取出器还设有一限位管，用于与所述固定组件相抵触进而限制所述编织管网的形状。本发明的封堵物形状更加合理并可精确控制，不易变形，更便于置入输尿管，更好地实现完全封堵，并可适时调整形状以解决结石嵌顿等问题，且其制作工艺是切实可行的。

The invention relates to a braided wire-type ureteral stone blocking extractor, which is provided with a handle, a pipe handle, a braided pipe net and an inner core. Membrane structure, the two ends of the braided tube net are respectively fixed on the distal end of the tube handle and the inner core through the fixing components; the braided tube network does telescopic motion under the drive of the tube handle; the braided ureteral stone blocking extractor A limiting tube is also provided, which is used to interfere with the fixing component to limit the shape of the braided tube network. The shape of the plugging object of the invention is more reasonable and can be precisely controlled, is not easily deformed, is more convenient to insert into the ureter, better achieves complete plugging, and can adjust the shape in time to solve problems such as stone incarceration, and the manufacturing process is practical feasible.

Description

Braided wire type ureteral calculus blocking extractor

Technical Field

The invention relates to the technical field of medical instruments, in particular to a braided ureteral calculus blocking extractor.

Background

The incidence rate of urinary calculus is up to 5% -10%, and the urinary calculus can be found in any part of kidney, bladder, ureter and urethra, and kidney and ureter calculus are common. Ureteroscope lithotripsy is performed through a natural cavity of a human body for lithotripsy, has the advantages of small wound and exact lithotripsy, and is one of the main treatment means of ureteral calculus at present. However, ureteroscopy also has certain deficiencies at present: 1. stones and stone fragments at the middle and upper sections of the ureter are easy to be flushed back into the kidney by the recoil force of a water flow or stone breaking tool; 2. residual stone debris within the ureteral lumen is not removed in a quick and efficient manner.

Blocking the upper part of the ureteral calculus through a tool is an important means for preventing the ureteral calculus from being backflushed back to the kidney, at present, some ureteral occluders are clinically used, and generally, the calculus blocking tool also has the function of taking out the calculus. However, these ureteral occluders still have certain disadvantages in practical use.

For example, chinese patent document CN 200920269281.5, published japanese 2010.08.25, discloses a compact body cavity occluder, which comprises a guide wire, a catheter, and an axially compressible occluding object, wherein the occluding object is composed of more than two flat membranes, the surfaces of the membranes are coated with hydrophilic coatings to make the membranes adhere to each other in a flat shape, at least one lumen capable of passing through the guide wire is arranged in the axial direction of the membranes, the distal end of the membranes is fixed with the guide wire, the proximal end of the guide wire is pulled, and the expanded occluding object is axially compressed to form plug-shaped occluding objects distributed in the radial direction in a circumferential direction. The utility model discloses a main advantage is for the plugging device that previous monolithic membrane constitutes, and its shutoff is more abundant, can effectively prevent that the barrier from escaping from the space of plugging device.

However, the above occluder still has the following drawbacks: (1) although the diaphragm is composed of more than two flat diaphragms, the plugging effect is improved compared with that of a single diaphragm, the diaphragm is originally radial, and is compressed to form a circumferential distribution bolt-shaped plugging object, gaps are still formed in the bolt-shaped plugging object, and the possibility of escaping of calculus is still existed in the process of taking out calculus; (2) the far end of the membrane is fixed with the guide wire, and then the plug-shaped plugging object is formed under the traction of the guide wire, the peripheral shape of the formed plugging object is uncertain, whether the plugging object is matched with the shape of the ureter well to realize complete plugging or not can be realized, and the effect is also uncertain; (3) the external shape of the plug-shaped plugging body formed by the membrane is inconvenient for manual accurate control, and the plug-shaped plugging body cannot be timely adjusted according to needs in the stone removing process or has poor effect after adjustment; (4) the hydrophilic coating is coated on the surfaces of the membranes to enable the membranes to be mutually bonded in a flat shape, so that the bonding between the membranes can be broken and dispersed when the membranes do not reach the upper end of the calculus, the controllability is poor, the calculus is easy to shift or fail to be placed in the placing process, and the hydrophilic coating is coated on the surfaces of the membranes to enable the manufacturing process of the mutual bonding of the membranes to have higher requirements.

Therefore, there is a need for a ureteral calculus blocking extractor which has a more reasonable and controllable shape of the blocking object, is not easy to deform, facilitates complete blocking, timely adjustment and convenient placement, and has a feasible manufacturing process, but no report is found about such devices at present.

Disclosure of Invention

The invention aims to provide a braided ureteral calculus blocking extractor aiming at the defects in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a braided wire type ureteral calculus blocking extractor is provided with a handle, a tube handle, a braided tube network and an inner core, wherein the braided tube network is a tubular network formed by braiding a plurality of metal wires, the far end of the braided tube network is covered with a membrane structure, and two ends of the braided tube network are respectively fixed on the far end of the tube handle and the inner core through fixing assemblies; the braided pipe network is driven by the pipe handle to do telescopic motion, and the braided ureteral calculus blocking extractor is also provided with a limiting pipe which is used for abutting against the fixed component to limit the shape of the braided pipe network.

The metal wires are obliquely and crossly woven; or the metal wires on the proximal side are obliquely and crossly woven, and a plurality of the metal wires are stretched to the distal side and adjacent metal wires are mutually wound, and finally the distal ends are gathered together.

The number of the metal wires is an integer between 4 and 200, and the woven pipe network can be formed by weaving equal-diameter metal wires or two or more than two kinds of metal wires at intervals.

The limiting pipe is fixed with the near end of the braided pipe network and the far end of the pipe handle, and the far end of the limiting pipe is a free end.

The inner core and the pipe handle are sleeved with a limiting pipe, and the middle section of the limiting pipe is fixed with the near end of the braided pipe network and the far end of the pipe handle through a fixing assembly.

The handle is provided with a limiting sliding chute, and a push handle is assembled in the limiting sliding chute; the proximal end of the inner core is inserted into the installation cavity of the handle, and the inner core is fixed with the handle; the tube handle is sleeved outside the inner core, and the near end of the tube handle is inserted into the installation tube cavity of the handle and fixed with the push handle.

The push handle is provided with a push handle push block, a sliding strip is arranged below the push handle push block, two side edges below the sliding strip are respectively provided with an arc-shaped push handle limiting part, and the lower edge of each push handle limiting part is provided with a push handle limiting block; the near end of the tube handle is provided with a limit groove; the push handle limiting block is embedded in the limiting groove, and the push handle limiting part is attached to the back side of the pipe handle.

A limit cover is arranged on the end surface of the near end of the handle; the inner core fixing groove is formed in the inner wall of the rear cover of the limiting cover; the inner core fixing ball is arranged at the tail end of the near end of the inner core; the inner core fixing ball is matched with the inner core fixing groove, so that the inner core is fixed with the handle.

The inner wall of the limiting cover is provided with limiting cover mounting teeth, the near end of the handle is provided with limiting cover mounting holes, and the limiting cover mounting teeth are inserted into the limiting cover mounting holes.

The range of coverage of the membranous structure is at least from the far end of the braided tubular network to the position of the largest diameter when in use.

The far end of the inner core is provided with a flexible tail end.

The inner core is a hollow tube.

When the device is in a working state, the maximum diameter of the braided pipe network is more than or equal to 5 mm and less than or equal to 30 mm; the length of the maximum diameter section is more than 0mm and less than or equal to 10 mm.

The braided pipe network is in a fusiform use state, the far end of the braided pipe network is in a half fusiform state, and the near end of the braided pipe network is in an umbrella shape or umbrella shape.

The invention has the advantages that:

1. the invention relates to a braided wire ureteral calculus blocking extractor, wherein a plugging object is a braided pipe network with a membranous structure, the shape of the braided pipe network can be controlled to be tubular or fusiform, the far end of the braided wire ureteral calculus blocking extractor is half fusiform, and the near end of the braided wire ureteral calculus blocking extractor is umbrella-shaped or umbrella-shaped; the braided pipe network is not easy to deform, the membranous structure is well supported by the braided pipe network and is not easy to deform, the peripheral diameter of the braided pipe network can be adjusted in due time according to the diameter of the ureter of a patient, and complete plugging is always realized and the damage to the wall of the ureter is avoided; and the accidental situations of calculus incarceration and the like can be solved in time.

2. The braided wire type ureteral calculus blocking extractor is provided with the limiting pipe, and the structural design of the limiting cover, the pushing handle, the pipe handle and the inner core ensures that the shape of a braided pipe network can be manually and accurately controlled.

3. The braided wire ureteral calculus blocking extractor has a compact structure, and the design of each part has low requirements on the preparation process, so that the braided wire ureteral calculus blocking extractor is feasible and can effectively avoid the influence of the preparation process on the use effect.

Drawings

Fig. 1 is a schematic structural view of the braided ureteral stone blocking extractor of example 1.

Fig. 2 is a schematic structural view of the handle of embodiment 1.

Fig. 3 is a schematic structural view of the push lever of embodiment 1.

Fig. 4A is a front view of the position restricting cover of embodiment 1.

Fig. 4B is a cross-sectional view C-C of fig. 4A.

Fig. 4C is a right side view of the position restricting cover of embodiment 1.

Figure 5 is an assembly view of the braided ureteral stone block extractor of example 1.

Fig. 6 is a partially enlarged view of a in fig. 5.

Figure 7 is a schematic view of a first state of use of the braided ureteral stone occlusion extractor of example 1.

Figure 8 is a schematic view of a second state of use of the braided ureteral stone occlusion extractor of example 1.

Figure 9 is a schematic view of a third use of the braided ureteral stone occlusion extractor of example 1.

Fig. 10 is a schematic view of the core structure of example 2.

FIG. 11 is a schematic representation of the woven tubing network of example 3.

Figure 12 is a schematic view of a braided ureteral stone block extractor of example 4 in a first use configuration.

Figure 13 is a schematic view of a second state of use of the braided ureteral stone barrier extractor of example 4.

Detailed Description

The inventor of the present invention has made extensive research experience in the field, and can recognize the existence or possible occurrence of subtle defects in the surgical process and further effectively solve the problems.

The following detailed description of the present invention will be made with reference to the accompanying drawings.

The reference numerals and components referred to in the drawings are as follows:

1. the handle comprises a handle, 11 parts of a limit cover, 111 parts of a limit cover rear cover, 112 parts of an inner core fixing groove, 113 parts of a limit cover mounting tooth, 12 parts of a push handle mounting hole, 13 parts of a limit sliding chute, 14 parts of a mounting tube cavity, 15 parts of a limit cover mounting hole, 16 parts of a push handle, 161 parts of a push handle push block, 162 parts of a sliding strip, 163 parts of a push handle limiting part, 164 parts of a push handle limiting block

2. Pipe handle, 21, limiting groove

3. Braided tube net, 31, metal wire, 32, membrane structure, 33, fixing component, 34, limiting tube

4. Inner core, 41 inner core fixing ball, 42 flexible end

Example 1

Referring to fig. 1, fig. 1 is a schematic structural view of a braided ureteral stone blocking extractor of example 1. The braided wire type ureteral calculus blocking extractor is provided with a handle 1, apipe handle 2, abraided pipe network 3 and aninner core 4. And alimit cover 11 is arranged on the end surface of the near end of the handle 1.

Referring to fig. 2, fig. 2 is a schematic structural view of the handle of embodiment 1. The back side of the handle 1 is provided with a pushhandle mounting hole 12 and alimit sliding groove 13, wherein the pushhandle mounting hole 12 is positioned at the near end of thelimit sliding groove 13 and the push handle mounting hole and the limit sliding groove are communicated. The handle 1 is provided with a mountinglumen 14 running through the proximal and distal ends. Two limitingcover mounting holes 15 are formed in the back side of the near end of the handle 1, and the two limitingcover mounting holes 15 are symmetrical relative to the axial direction of the limiting slidinggroove 13.

Referring to fig. 1 again, the handle 1 is provided with apush handle 16 in the position-limiting slidinggroove 13. Referring to fig. 3, fig. 3 is a schematic structural view of the push handle in embodiment 1. The push handle 16 is provided with a push handle push block 161, a slidingbar 162 is arranged below the push handle push block 161, two side edges below the slidingbar 162 are respectively provided with an arc-shaped pushhandle limiting part 163, the lower edge of each push handle limitingpart 163 is respectively provided with a pushhandle limiting block 164, the pushhandle limiting blocks 164 are cylindrical, and the height direction of the pushhandle limiting blocks 164 is perpendicular to the plane where the ventral side of the push handle push block 161 is located.

Referring to fig. 4A, 4B and 4C, fig. 4A is a front view of the position-limiting cover of embodiment 1, fig. 4B is a cross-sectional view of C-C of fig. 4A, and fig. 4C is a right view of the position-limiting cover of embodiment 1. The near end of thelimit cover 11 is closed, a limit coverrear cover 111 is arranged, and an innercore fixing groove 112 is arranged in the center of the inner wall of the limit coverrear cover 111. The inner wall of the back side of the position-limitingcover 11 is provided with two position-limitingcover mounting teeth 113.

Referring to fig. 5, fig. 5 is an assembly view of the braided ureteral stone barrier extractor of example 1. Thehandle 2 is a hollow tube, and the proximal end of the handle is provided with an annular limiting groove 21 (see fig. 6, and fig. 6 is a partial enlarged view of a in fig. 5). Theinner core 4 is provided with an innercore fixing ball 41 at the proximal end (see fig. 6, fig. 6 is a partial enlarged view of a in fig. 5), and theinner core 4 is provided with aflexible end 42 at the distal end, wherein theflexible end 42 is of a blunt flexible structure.

During assembly, the two limitingcover mounting teeth 113 of the limitingcover 11 are respectively inserted into the two limitingcover mounting holes 15 of the handle 1, so that the limiting coverrear cover 111 seals the proximal end face of the handle 1; the proximal end of theinner core 4 is inserted into theinstallation tube cavity 14 of the handle 1, and the innercore fixing ball 41 is assembled in the innercore fixing groove 112 of the limitingcover 11, so that theinner core 4 and the handle 1 are relatively fixed; thetube handle 2 is sleeved outside theinner core 4, and the near end of thetube handle 2 is inserted into theinstallation tube cavity 14 of the handle 1; the push handle 16 is assembled in the pushhandle mounting hole 12, the push handle limiting block 164 of the push handle 16 is embedded in the limitinggroove 21 of thetube handle 2, so that thetube handle 2 and the push handle 16 are relatively fixed, the pushhandle limiting part 163 is attached to the back side of thetube handle 2, the slidingstrip 162 can move in the limiting slidinggroove 13, and the tube handle 2 can be driven to slide relative to theinner core 4 when the push handle 16 moves.

The wovenpipe network 3 is a tubular network formed by weaving a plurality ofmetal wires 31 in a crossed mode, and amembrane structure 32 is covered on the wovenpipe network 3. The two ends of thebraided pipe network 3 are respectively fixed on the far end of thepipe handle 2 and theflexible tail end 42 of theinner core 4 through the fixingcomponents 33. A limitingtube 34 is sleeved between theinner core 4 and thetube handle 2, specifically, the middle section of the limitingtube 34 is fixed with the near-end of thebraided tube network 3 and the far-end of the tube handle 2 through a fixingcomponent 33, and the far end of the limitingtube 34 is a free end; theinner core 4 and the limitingtube 34 can slide relatively.

Based on the structure, the push-pull handle 16 can control the relative sliding between thepipe handle 2 and theinner core 4, thereby driving thebraided pipe network 3 to do telescopic motion. When the push handle 16 is pulled to the near end, the braided pipe network 3 can be pulled to be in a state of minimum diameter and longest length, and the state is a state of preparing for using the device; when the push handle 16 is pushed to the far end, the braided tube network 3 can be pushed to the using state of the appliance, the first using state is a fusiform shape (see figure 7, figure 7 is a schematic diagram of the first using state of the braided ureteral calculus blocking extractor of the embodiment 1), if the push handle 16 is pushed further distally, the shape of the woven tubular network 3 changes to a second state of use, namely, the part with the distal end in the shape of a half fusiform and the radial maximum size in the shape of an umbrella sunk from the proximal end to the distal end is a section (see figure 8, figure 8 is a second using state diagram of the braided wire ureteral calculus blocking extractor of the embodiment 1), or the shape of the braided tube network 3 is changed into a third using state, namely the part which is umbrella-shaped and has the maximum radial size is only one point (see fig. 9, and fig. 9 is a third using state schematic diagram of the braided ureteral calculus blocking extractor of the embodiment 1); when the push handle 16 is pushed to a certain extent towards the far end, the movement of the push handle 16 is limited due to the contact between the limit tube 34 and the fixing component 33, and the shape of the braided pipe network 3 is further limited.

It is noted that, herein, it is defined that the handle end of the instrument is a proximal end and the other end is a distal end. The "dorsal side" is a side facing directly upward when the device is in use, and the "ventral side" is a side facing directly downward when the device is in use.

The number of themetal wires 31 is an integer between 4 and 200, and thewoven pipe network 3 can be formed by weaving metal wires with equal diameters or two or more than two metal wires with different diameters at intervals and can have various weaving forms. The fixingcomponent 33 may be a ring-shaped thin-walled metal tube, a tube formed by winding a thin metal wire, or an adhesive, but is not limited thereto as long as it can fix the corresponding component. Themembranous structures 32 can be placed on the outer surface, the inner surface of the woventubular network 3 or between thewires 31. By setting the movement range of the push handle 16, such as the length of thelimit pipe 34 or the length of thelimit chute 13, thebraided pipe network 3 can be molded into different shapes. The pipe handle 2 is a hollow thin-wall pipe made of metal, plastic, high polymer material, polymer and the like. The portion of theinner core 4 other than theflexible tip 42 may be of a rigid metal rod or hollow metal tube construction.

The assembly modes among the fixedcomponent 33, the limitingpipe 34, thepipe handle 2, thebraided pipe network 3 and theinner core 4 have extremely strong practical operability in the preparation process, and the using effect of the appliance cannot be obviously influenced by the quality of the preparation process. The braided pipe network 3 is a tubular network braided by a plurality of metal wires 31, the shape of the braided pipe network can be controlled by the push handle 16, and the braided pipe network has the advantages that: on the first hand, the placement of the instrument is convenient, the instrument cannot deform in the placement process, and the displacement of the calculus is not easy to cause; in the second aspect, the membranous structure 32 is supported by the woven pipe network 3, and cannot deform due to water flow perfusion and stone contact in the dragging process, so that stones are not easy to miss and stone incarceration are not easy to occur; in the third aspect, the braided pipe network 3 is always tubular, fusiform, semi-fusiform at the far end and umbrella-shaped or umbrella-shaped at the near end, and the periphery is always round in the use state and can be well matched with the shape of the ureter to realize complete plugging; wherein, the part of the braided pipe network 3 with the radial maximum size is a section in the second using state, so that the plugging effect is better; the braided pipe network 3 is in the second use state or the third use state, which is determined by the number, the length, the pushing distance and other factors of the metal wires 31, in a word, the shape of the braided pipe network is controllable, the radial maximum size of the braided pipe network is ensured to be within 5-30mm so as to be tightly attached to the ureter wall, and the length of the maximum diameter section of the braided pipe network 3 in the use state is preferably more than 0mm and less than or equal to 10 mm; in the fourth aspect, when an accident such as stone insertion occurs, the outer diameter of the braided pipe network 3 can be adjusted in time to quickly solve the problem, and the damage to the wall of the ureter can be prevented, and the braided pipe network can also be adjusted in time when the blockage is incomplete or the outer diameter of the braided pipe network 3 is too large. The coverage range of the membrane-shapedstructure 32 is at least from the far end of thebraided pipe network 3 to the maximum diameter position in a use state, namely the coverage range at least covers the upper half section of thebraided pipe network 3, so that when an instrument is in the use state in a ureter, when water is injected into the ureter, the water flows towards the lower part of the ureter under the resistance action after meeting the membrane-shapedstructure 32 on thebraided pipe network 3, namely the membrane-shapedstructure 32 has the function of changing the direction of water flow, so that the water flow can wrap stone fragments to be discharged into the bladder, and the shape of the membrane-shapedstructure 32 is controllable and difficult to deform under the support of thebraided pipe network 3 and is attached to the wall of the ureter, thereby realizing complete plugging and one-time stone extraction without missing the stone fragments. Theflexible end 42 of theinner core 4 improves the passage of the instrument into the ureter and reduces the chance of collateral damage.

The structural design of the limitingcover 11 and the limitingcover mounting hole 15 ensures that the limitingcover 11 and the limiting cover mounting hole can be stably fixed. The structural design of the innercore fixing groove 112 and the innercore fixing ball 41 ensures that the handle 1 and theinner core 4 can be stably fixed. The pushhandle limiting part 163 and the push handle limiting block 164 of the push handle 16 are matched with the back side of thepipe handle 2 and the limitinggroove 21, the structure is simple, and thepipe handle 2 and the push handle 16 can be stably fixed. Theposition limiting tube 34 can limit the shape of thebraided tube network 3, and the proximal end of thebraided tube network 3 and the distal end of thetube handle 2 are fixed at the middle position of theposition limiting tube 34, the middle position refers to a section of theposition limiting tube 34 excluding the proximal end and the distal end, preferably a section in the middle 1/3 of theposition limiting tube 34, so that theposition limiting tube 34 can be ensured to be translated during pushing, and slight deviation is avoided. The structural design makes the device compact in structure and further ensures that the shape of thebraided pipe network 3 can be accurately controlled artificially.

The use method of the braided ureteral calculus blocking extractor comprises the following steps: during ureteroscope lithotripsy, an endoscope is firstly placed to find out calculus, if the calculus is incarceration calculus, a laser optical fiber can be firstly introduced to crush part of the calculus until the calculus can be broken by the instrument, and if the calculus is non-incarceration calculus, the instrument can be introduced; firstly, taking apart the factory package of the braided wire type ureteral calculus blocking extractor, holding the handle 1 by hand, pulling the push handle 16 towards the near end, and pulling the braided pipe network 3 to be in a state of minimum diameter and longest length, namely an appliance preparation use state; the flexible tail end 42 of the inner core 4 is inserted into the endoscope working channel, under the direct vision guidance of the endoscope, the instrument bypasses the calculus and reaches the position above the calculus, and then the push handle 16 is pushed towards the far end to push the braided pipe network 3 to be in the using state of the instrument; if the diameter of the stone fragments is suitable to be discharged from the ureter into the bladder, water can be injected into the ureter through the endoscope working channel, the braided ureter stone blocking extractor is dragged to the near end, the injected water flow continuously impacts the membrane structure 32 in the braided pipe network 3, the stone fragments are intercepted and backwashed downwards, and the stone fragments are dragged by the water flow and finally are moved into the bladder; if the size of the stone fragments is larger, laser is required to be introduced for crushing, the limiting cover 11 and the push handle 16 on the handle can be disassembled in sequence, so that the body of the handle 1 is separated from the inner core 4 and the tube handle 2, an assistant assists in fixing the position of the instrument in the body and does not move, an operator withdraws the ureteroscope out of the body, then sequentially inserts the inner core 4 and the tube handle 2 into the handle, installs the push handle 16, finally installs the limiting cover 11, pushes the push handle 16 on the handle 1 until the woven tube network 3 is in a blocking state after the instrument is assembled, then places the ureteroscope in the body, introduces optical fibers for lithotripsy operation, withdraws the laser optical fibers after the stones are completely crushed, repeats the operations of water injection and downward dragging of the blocking instrument until the stones are completely flushed out of the bladder. In the operation process, if an accident of stone incarceration occurs, the push handle 16 can be adjusted in time to adjust the shape of thebraided pipe network 3 so as to relieve the problem, and the peripheral diameter of thebraided pipe network 3 can be adjusted in time according to the circumference of the ureter of a patient so as to realize tight fit without damaging the wall of the ureter.

The shape of the braided wire type ureteral calculus blocking extractor can be manually and accurately controlled, the braided wire type ureteral calculus blocking extractor is easy to place in a ureter, calculus can not be pushed to move backwards to the kidney and cause damage to the ureter wall, the shape can be timely adjusted to completely block the ureter, calculus and calculus fragments are effectively prevented from being flushed back into the kidney by pouring water flow, the condition of calculus incarceration is not easy to occur, the calculus extracting process is not easy to deform and rub the ureter wall, all calculus can be extracted at one time, and the purpose of efficiently removing calculus is achieved.

The braided ureteral calculus blocking extractor can be used for plugging and removing ureteral calculus, and can also be used for plugging other body cavities and removing foreign matters, including but not limited to the following applications: the product can be used for blocking and removing kidney stone, blood vessel thrombosis, blood vessel puncture hole, hemostasis, and foreign body in body cavity such as trachea and intestinal tract.

Example 2

The braided ureteral stone block extractor of this example is substantially the same as the braided ureteral stone block extractor described in example 1, except that (see fig. 10, fig. 10 is a schematic view of the inner core structure of example 2): theinner core 4 is a homogeneous hollow tube, namely, an innercore fixing ball 41 starting from the far end of theinner core 4 to the near end of theinner core 4, and a through cavity is arranged in the center of the inner core fixing ball. When the scheme is used, an additional guide wire is required to be matched as a guide instrument, the guide wire can be inserted from one side of the innercore fixing ball 41, and the guide wire is preferably exposed out of the distal end of theinner core 4.

Example 3

The braided ureteral stone block extractor of this example is substantially the same as the braided ureteral stone block extractor described in example 1, except that (see fig. 11, fig. 11 is a schematic view of the braided tube network structure of example 3): thewoven pipe network 3 is in a first use state in the form of a long shuttle, i.e. the central section is a cylinder with the largest outer diameter. Thebraided pipe network 3 in the shape has a longer section with the largest diameter, can be better tightly attached to the wall of the ureter, and has better effects of intercepting broken stones and preventing stone incarceration.

Example 4

Referring to fig. 12 and 13, fig. 12 is a schematic view showing a first usage state of the braided ureteral stone block extractor of example 4, and fig. 13 is a schematic view showing a second usage state of the braided ureteral stone block extractor of example 4. The braided ureteral stone block extractor of this example is substantially the same as the braided ureteral stone block extractor described in example 1, except that: themetal wires 31 on the near end side of thebraided pipe network 3 are obliquely and crossly braided, and a plurality ofmetal wires 31 extend to the far end side, and theadjacent metal wires 31 are mutually intertwined, and finally the far ends of thebraided pipe network 3 are gathered together, namely themetal wires 31 of thebraided pipe network 3 are transited from the oblique crossly braided near end to the state that more than twometal wires 31 are intertwined and supported at the far end. Themembrane structure 32 covers the distal side of the woventubular network 3. In the using state, when the handle is pushed, the wholebraided pipe network 3 can be in a fusiform, namely the first using state, one side of the near end of thebraided pipe network 3 can be further pushed into the inside of one side of the far end, and the braided pipe network is in a half fusiform at the far end and in an umbrella-shaped form at the near end. The advantage of this embodiment is that the braidedtubular network 3 on the distal end side has a stronger distraction force because itswires 31 are intertwined, thereby being more favorable to maintaining the shape of the occlusion in the ureter and achieving a better occlusion effect.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.

Claims (11)

1. A braided wire type ureteral calculus blocking extractor is characterized by comprising a handle, a pipe handle, a braided pipe network and an inner core, wherein the braided pipe network is a tubular network formed by braiding a plurality of metal wires, the far end of the braided pipe network is covered with a membrane structure, and two ends of the braided pipe network are fixed on the far end of the pipe handle and the inner core through fixing assemblies respectively; the braided pipe network is driven by the pipe handle to do telescopic motion, and when the pipe handle moves from the near end to the far end, the braided pipe network sequentially forms a fusiform shape, a semi-fusiform shape at the far end, an umbrella shape at the near end and an umbrella shape; the braided wire type ureteral calculus blocking extractor is further provided with a limiting pipe, the limiting pipe is abutted to the fixing assembly to limit the braided pipe network when the braided pipe network forms an umbrella shape, the braided pipe network is kept to be umbrella-shaped, the limiting pipe is sleeved between the inner core and the pipe handle, the middle section of the limiting pipe is fixed with the near end of the braided pipe network and the far end of the pipe handle through the fixing assembly, and the inner core can slide relative to the limiting pipe and the pipe handle.

2. The braided ureteral stone barrier extractor of claim 1, wherein said wire is cross-woven in a diagonal pattern; or the metal wires on the proximal side are obliquely and crossly woven, and a plurality of the metal wires are stretched to the distal side and adjacent metal wires are mutually wound, and finally the distal ends are gathered together.

3. The braided ureteral calculus blockage extractor of claim 1, wherein the number of the metal wires is an integer between 4 and 200, and the braided tube network can be braided from equal diameter metal wires or from two or more than two metal wires with different diameters.

4. The braided ureteral calculus blocking extractor of claim 1, wherein the handle is provided with a limiting chute, and a push handle is assembled in the limiting chute; the proximal end of the inner core is inserted into the installation cavity of the handle, and the inner core is fixed with the handle; the tube handle is sleeved outside the inner core, and the near end of the tube handle is inserted into the installation tube cavity of the handle and fixed with the push handle.

5. The braided wire ureteral calculus blockage extractor of claim 4, wherein the push handle is provided with a push handle push block, a sliding strip is arranged below the push handle push block, two side edges below the sliding strip are respectively provided with an arc-shaped push handle limiting part, and the lower edge of each push handle limiting part is respectively provided with a push handle limiting block; the near end of the tube handle is provided with a limit groove; the push handle limiting block is embedded in the limiting groove, and the push handle limiting part is attached to the back side of the pipe handle.

6. The braided ureteral calculus blocking extractor of claim 1, wherein a stop cap is provided on the proximal end face of the handle; the inner core fixing groove is formed in the inner wall of the rear cover of the limiting cover; the inner core fixing ball is arranged at the tail end of the near end of the inner core; the inner core fixing ball is matched with the inner core fixing groove, so that the inner core is fixed with the handle.

7. The braided ureteral calculus blocking extractor of claim 6, wherein the inner wall of the limiting cover is provided with limiting cover mounting teeth, the proximal end of the handle is provided with limiting cover mounting holes, and the limiting cover mounting teeth are inserted into the limiting cover mounting holes.

8. The braided ureteral stone barrier extractor of claim 1, wherein said membrane-like structure covers at least the distal end of the braided tubular network to the maximum diameter in use.

9. The braided ureteral stone barrier extractor of claim 1, wherein said inner core has a flexible tip at a distal end.

10. The braided ureteral stone barrier extractor of claim 1, wherein said inner core is a hollow tube.

11. The braided ureteral stone barrier extractor of claim 1, wherein in an operational state, the maximum diameter of said braided mesh is greater than or equal to 5 mm and less than or equal to 30 mm; the length of the maximum diameter section is more than 0mm and less than or equal to 10 mm.

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