CN105852933B - A braided ureteral stone blocking extractor - Google Patents

Abstract

The invention relates to a braided wire type ureteral calculus blocking extractor which 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 braided by 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 components; the braided pipe network is driven by the pipe handle to do telescopic motion, and the braided pipe network is in a fusiform use state, the far end is in a half fusiform shape, and the near end is in an umbrella shape or umbrella shape. The shape of the plugging body is more reasonable and can be accurately controlled, the plugging body is not easy to deform, the ureter can be conveniently placed, complete plugging can be better realized, the shape can be timely adjusted to solve the problems of stone incarceration and the like, and the manufacturing process is feasible.

Description

A braided ureteral stone blocking extractor

technical field

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

Background technique

The incidence of urinary calculi is as high as 5%-10%, which can be found in any part of the kidney, bladder, ureter and urethra, and kidney and ureteral calculi are common. Ureteroscopic lithotripsy is one of the main treatment methods for ureteral calculi due to the advantages of small trauma and accurate lithotripsy through the natural orifice of the human body. However, the current ureteroscopic lithotripsy also has certain shortcomings: 1. The stones and stone fragments in the middle and upper ureter are easily flushed back into the kidney by the recoil force of the perfusion water or the lithotripsy tool; 2. The residual stone fragments in the ureteral lumen There is no quick and efficient way to take it out.

Blocking the upper part of ureteral calculi with tools is an important means to prevent ureteral calculi from being recoiled back to the kidney. At present, there are some ureteral occluders in clinical practice. Usually, such stone blocking tools also have the function of removing calculi. However, these ureteral occluders still have certain disadvantages in practical use.

For example, Chinese patent document CN 200920269281.5, published on 2010.08.25, discloses a compact body cavity occluder, comprising a guide wire, a catheter, and an axially compressible occluder, the occluder is composed of two The surface of the diaphragm is coated with a hydrophilic coating to make the diaphragms adhere to each other in a flat shape, and there is at least one lumen in the axial direction of the diaphragm that can pass through the guide wire, The distal end of the diaphragm is fixed with the guide wire, the proximal end of the guide wire is pulled, and the expanded plug is compressed axially to form a circumferentially distributed plug-like plug in the radial direction. The main advantage of the utility model is that compared with the previous occluder composed of a single-piece membrane, the occlusion is more sufficient, which can effectively prevent obstacles from escaping from the gap of the occluder.

However, the above-mentioned occluder still has the following defects: (1) Although the diaphragm is composed of more than two flat diaphragms, the occlusion effect is improved compared with a single diaphragm, however, the diaphragm is originally radial, Circumferentially distributed plug-like plugs are formed after compression, and there must still be voids in the plug-like plugs. During the process of removing stones, there is still the possibility of stones escaping; (2) The distal end of the diaphragm is connected to the guide. Wire fixation, and then a plug-like occlusion is formed under the pulling of the guide wire. The peripheral shape of the occlusion formed in this way is uncertain, and its effect is also uncertain whether it can fit well with the shape of the ureter to complete the occlusion; (3) ) The shape of the plug-shaped plug formed by the diaphragm is inconvenient to be precisely controlled by humans, and it cannot be adjusted in time according to the needs during the stone extraction process, or the adjustment effect is not good; (4) The surface of the diaphragm is coated with a hydrophilic coating to make each The diaphragms are glued to each other in a flat shape, so the adhesion between the diaphragms may be destroyed and dispersed before the diaphragms reach the upper end of the stone. The controllability is poor, and the stone is easily displaced or failed during placement. In addition, the manufacturing process of applying a hydrophilic coating on the surface of the membrane to make the membranes adhere to each other has higher requirements.

Therefore, there is an urgent need for a ureteral stone blocking extractor with a more reasonable and controllable shape of the plug, which is not easily deformed, so as to facilitate complete plugging, timely adjustment and convenient placement, and the manufacturing process is feasible. Not reported.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a braided ureteral calculus blocking extractor in view of the deficiencies in the prior art.

For realizing the above-mentioned purpose, the technical scheme that the present invention takes is:

A braided wire type ureteral stone blocking extractor is provided with a handle, a pipe handle, a braided pipe net and an inner core, wherein the braided pipe net is a tubular net woven by several metal wires and the distal end is covered with a membrane structure , the two ends of the braided pipe network are respectively fixed on the distal end of the pipe handle and the inner core through the fixing components; the braided pipe network is driven by the pipe handle to expand and contract, and the use state of the braided pipe network is shuttle-shaped, The distal end is semifusiform and the proximal end is umbrella-shaped, or umbrella-shaped.

The metal wires are oblique cross-braided; or the metal wires on the proximal side are diagonal cross-braided, and some of the metal wires are stretched to the distal side and the adjacent metal wires are intertwined with each other, and finally the distal end of the metal wire is stretched to the distal side. come together.

The number of the metal wires is an integer between 4 and 200, and the braided pipe network can be made of metal wires of equal diameter or two or more diameter metal wires woven at intervals.

A limit tube is sleeved between the inner core and the tube handle, the middle section of the limit tube is fixed together with the proximal end of the braided tube network and the distal end of the tube handle through the fixing assembly, and the far end of the limit tube is fixed together. The end is the free end.

The handle is provided with a limit chute, and a push handle is assembled in the limit chute; the proximal end of the inner core is inserted into the installation lumen of the handle, and the inner core and the handle are fixed; the The pipe handle is sleeved on the outside of the inner core, and the proximal end of the pipe handle is inserted into the installation lumen of the handle and fixed with the push handle.

The push handle is provided with a push handle push block, a sliding bar is arranged below the push handle push block, and an arc-shaped push handle limiter is provided on each side edge below the sliding bar. The lower edge of the push handle limiter is respectively provided with push handle limit blocks; the proximal end of the pipe handle is provided with a limit groove; the push handle limit blocks are fitted into the limit grooves, and the push handle limit blocks are The handle limit part is attached to the back side of the pipe handle.

The end surface of the proximal end of the handle is provided with a limit cover; the limit cover is provided with a limit cover rear cover, and the inner wall of the limit cover rear cover is provided with an inner core fixing groove; the proximal end of the inner core The end is provided with an inner core fixing ball; 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 limit cover is provided with limit cover installation teeth, the proximal end of the handle is provided with a limit cover installation hole, and the limit cover installation teeth are inserted into the limit cover installation holes.

The covering range of the film-like structure is at least from the distal end of the braided tube network to the maximum diameter in the use state.

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

The inner core is a hollow tube.

In the working state, the maximum diameter of the braided pipe network is greater than or equal to 5 mm and less than or equal to 30 mm; the length of the maximum diameter section is greater than 0 mm and less than or equal to 10 mm.

The advantages of the present invention are:

1. The braided ureteral stone blocking extractor of the present invention, its blocker is a braided pipe network with a membranous structure, and its shape can be controlled to be tubular, fusiform, and the distal end is a semi-fusiform and the proximal end is Umbrella or umbrella shape, in the process of use, its shape is controllable, which is easy to insert into the ureter, and will not push the stone to retrograde to the kidney and cause damage to the ureteral wall; the braided tube network itself is not easy to deform, and the membranous structure is affected by the braided tube. The good support of the mesh is not easy to deform, and the outer diameter of the braided tube mesh can be adjusted according to the diameter of the patient's ureter, so as to achieve complete blockage and avoid damage to the ureteral wall; it can be solved in time for unexpected situations such as stone incarceration.

2. The braided ureteral stone blocking extractor of the present invention is provided with a limit tube, and the structural design of the limit cover, the push handle, the tube handle and the inner core ensures that the shape of the braided tube net can be artificially controlled accurately.

3. The braided ureteral stone blocking extractor of the present invention has a compact structure, and the design of each component is practical and feasible, and can effectively avoid the influence of the preparation process on the use effect.

Description of drawings

1 is a schematic structural diagram of the braided ureteral stone blocking extractor of Example 1.

FIG. 2 is a schematic structural diagram of the handle of Embodiment 1. FIG.

FIG. 3 is a schematic structural diagram of the push handle of Embodiment 1. FIG.

FIG. 4A is a front view of the limit cover of Embodiment 1. FIG.

FIG. 4B is a cross-sectional view taken along line C-C of FIG. 4A .

FIG. 4C is a right side view of the limiting cover of Embodiment 1. FIG.

FIG. 5 is an assembly diagram of the braided ureteral stone blocking extractor of Example 1. FIG.

FIG. 6 is a partial enlarged view of A in FIG. 5 .

7 is a schematic diagram of the first use state of the braided ureteral stone blocking extractor of Example 1.

8 is a schematic diagram of the second use state of the braided ureteral stone blocking extractor of Example 1.

9 is a schematic diagram of the third use state of the braided ureteral stone blocking extractor of Example 1.

FIG. 10 is a schematic diagram of the inner core structure of the second embodiment.

FIG. 11 is a schematic diagram of the structure of the braided pipe network in Example 3. FIG.

12 is a schematic diagram of the first use state of the braided ureteral stone blocking extractor of Example 4.

13 is a schematic diagram of the second use state of the braided ureteral stone blocking extractor of Example 4.

Detailed ways

The inventors of the present application have rich research experience in the field, and are able to realize the subtle defects that exist or may occur during the operation, and further effectively solve them. On this basis, the present invention has been completed.

The specific embodiments provided by the present invention will be described in detail below with reference to the accompanying drawings.

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

1. Handle, 11. Limit cover, 111. Limit cover back cover, 112. Inner core fixing groove, 113. Limit cover mounting teeth, 12. Push handle mounting hole, 13. Limit chute, 14. Installation lumen, 15. Limit cover mounting hole, 16. Push handle, 161. Push handle push block, 162. Slide bar, 163. Push handle limiter, 164. Push handle limit block

2. Pipe handle, 21. Limit groove

3. Braided pipe mesh, 31. Metal wire, 32. Membrane structure, 33. Fixed component, 34. Limit tube

4. Inner core, 41. Inner core fixing ball, 42. Flexible end

Example 1

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of the braided ureteral stone blocking extractor according to the first embodiment. The braided wire type ureteral stone blocking extractor is provided with a handle 1 , a pipe handle 2 , a braided pipe net 3 and an inner core 4 . The proximal end surface of the handle 1 is provided with a limiting cover 11 .

Please refer to FIG. 2 , which is a schematic structural diagram of the handle of the first embodiment. A push handle mounting hole 12 and a limit chute 13 are provided on the back side of the handle 1 , and the push handle mounting hole 12 is located at the proximal end of the limit chute 13 and the two are connected. The handle 1 is provided with a mounting lumen 14 communicating with the proximal end and the distal end. The back side of the proximal end of the handle 1 is provided with two limit cover mounting holes 15 , and the two limit cover mounting holes 15 are symmetrical with respect to the limit chute 13 in the axial direction.

Referring to FIG. 1 again, a push handle 16 is assembled in the limit chute 13 of the handle 1 . Please refer to FIG. 3 for details. FIG. 3 is a schematic structural diagram of the push handle according to the first embodiment. The push handle 16 is provided with a push handle push block 161 , a slide bar 162 is provided below the push handle push block 161 , and an arc-shaped push handle limiter is provided on both sides under the slide bar 162 . The lower edge of each push handle limiting portion 163 is respectively provided with a push handle stop block 164. The push handle stop block 164 is cylindrical, and its height direction is perpendicular to the belly of the push handle push block 161. The plane on which the side is located.

4A, FIG. 4B, FIG. 4C, FIG. 4A is a front view of the limiting cover of Embodiment 1, FIG. 4B is a C-C cross-sectional view of FIG. 4A, and FIG. 4C is a right side view of the limiting cover of Embodiment 1. The proximal end of the limit cover 11 is closed, and a limit cover rear cover 111 is provided. The inner wall of the limit cover rear cover 111 is provided with an inner core fixing groove 112 in the center. The inner wall on the back side of the limiting cover 11 is provided with two limiting cover mounting teeth 113 .

Please refer to FIG. 5 , which is an assembly diagram of the braided ureteral stone blocking extractor according to the first embodiment. The pipe handle 2 is a hollow pipe with an annular limiting groove 21 at its proximal end (refer to FIG. 6 , which is a partial enlarged view of A in FIG. 5 ). The proximal end of the inner core 4 is provided with an inner core fixing ball 41 (refer to FIG. 6 , which is a partial enlarged view of A in FIG. 5 ), and the distal end of the inner core 4 is provided with a flexible end 42. The tip 42 is a blunt flexible structure.

During assembly, the two limit cover mounting teeth 113 of the limit cover 11 are respectively inserted into the two limit cover installation holes 15 of the handle 1 , so that the limit cover rear cover 111 closes the handle 1 . The proximal end face; the proximal end of the inner core 4 is inserted into the installation lumen 14 of the handle 1, and the inner core fixing ball 41 is assembled in the inner core fixing groove 112 of the limit cover 11, so that the inner core 4 and the handle are 1 is relatively fixed; the pipe handle 2 is sleeved on the outside of the inner core 4, and the proximal end of the pipe handle 2 is inserted into the installation lumen 14 of the handle 1; the push handle 16 is assembled in the push handle installation hole 12 , the push handle limit block 164 of the push handle 16 is fitted into the limit groove 21 of the pipe handle 2 , so that the pipe handle 2 and the push handle 16 are relatively fixed, and the push handle limit portion 163 is attached to the back side of the pipe handle 2 , the sliding bar 162 can move in the limit chute 13 , and when the push handle 16 moves, it can drive the pipe handle 2 to slide relative to the inner core 4 .

The braided pipe mesh 3 is a tubular mesh formed by interlacing several metal wires 31 , and the braided pipe mesh 3 is covered with a membrane structure 32 . The two ends of the braided tube mesh 3 are respectively fixed on the distal end of the tube handle 2 and the flexible end 42 of the inner core 4 through the fixing components 33 . A limit tube 34 is sleeved between the inner core 4 and the tube handle 2. Specifically, the middle section of the limit tube 34 is fixed with the proximal end of the braided tube mesh 3 and the distal end of the tube handle 2 through the fixing assembly 33. Together, the distal end of the limiting tube 34 is a free end; the inner core 4 and the limiting tube 34 can slide relative to each other.

Based on the above structure, the relative sliding between the pipe handle 2 and the inner core 4 can be controlled by pushing and pulling the push handle 16 , thereby driving the braided pipe mesh 3 to perform telescopic motion. When the push handle 16 is pulled proximally, the braided tube mesh 3 can be pulled into a state with the smallest diameter and the longest length, which is the state of preparation for use of the instrument; when the push handle 16 is pushed distally, the braided tube mesh 3 can be pulled Pushed into the use state of the instrument, the first use state is a shuttle shape (refer to Figure 7, Figure 7 is a schematic diagram of the first use state of the braided ureteral stone blocking extractor of Example 1), such as continuing to push to the distal end Push the handle 16, then the shape of the braided pipe net 3 changes to the second state of use, that is, the distal end is semi-fusiform, the proximal end sinks to the distal direction to form an umbrella shape, and the part with the largest radial dimension is a section (Refer to Figure 8, Figure 8 is a schematic diagram of the second use state of the braided ureteral stone blocking extractor of Example 1), or the shape of the braided tube network 3 is changed to a third use state, that is, umbrella-shaped and The part with the largest radial dimension is only one point (see Fig. 9, Fig. 9 is a schematic diagram of the third use state of the braided ureteral stone blocking extractor of Example 1); when the push handle 16 is pushed to the distal end to a certain After the limit tube 34 collides with the fixing assembly 33, the movement of the push handle 16 is restricted, thereby restricting the shape of the braided tube network 3.

It should be noted that, in this article, the handle end of the instrument is defined as the proximal end, and the other end is the distal end. The "back side" refers to the side facing directly upward when the device is in use, and the "abdominal side" refers to the side facing directly downward when the device is in use.

The number of the metal wires 31 is an integer between 4 and 200. The braided pipe mesh 3 can be made of equal-diameter metal wires or two or more diameter metal wires woven at intervals, and there can be a variety of braids. form. The fixing component 33 can be an annular thin-walled metal tube, a tube formed by winding thin metal wires, or an adhesive, but not limited to this, as long as the corresponding components can be fixed. The film-like structure 32 can be placed on the outer surface, the inner surface of the braided tube mesh 3 or between the metal wires 31 . By setting the movement range of the push handle 16 , such as setting the length of the limiting tube 34 or the length of the limiting chute 13 , the braided pipe mesh 3 can be molded into different shapes. The pipe handle 2 is a hollow thin-walled pipe, and the material can be metal, plastic, polymer material, polymer and the like. The part of the inner core 4 other than the flexible end 42 may be in the form of a rigid metal rod or a hollow metal tube.

The assembling method between the fixing assembly 33, the limiting tube 34 and the tube handle 2, the braided tube net 3, and the inner core 4 has a very strong practical operability in terms of the preparation process, and the preparation process is not good or bad. It will have a significant impact on the use of the device. The braided pipe mesh 3 itself is a tubular mesh woven from several metal wires 31, and its shape can be controlled by the push handle 16. The advantages are: first, it is convenient for the placement of the instrument and will not deform during the placement process. , it is not easy to cause stone displacement; secondly, under the support of the braided pipe network 3, the membrane structure 32 will not be deformed due to water perfusion and stone contact during the dragging process, and it is not easy to miss stones and cause stone incarceration. In the third aspect, the shape of the braided pipe net 3 is always tubular, fusiform, the distal end is semi-fusiform and the proximal end is umbrella-shaped or umbrella-shaped, and the outer periphery is always circular in the use state, which can be very good with the shape of the ureter. In the second use state, the part with the largest radial dimension of the braided pipe network 3 is a section, and the blocking effect is better; the braided pipe network 3 in the second use state is still in the second use state. The third use state is determined by factors such as the number, length, and pushing distance of the metal wires 31. In short, its shape is controllable, and its maximum radial dimension is guaranteed to be within 5-30mm to closely fit with the ureteral wall. Yes, the length of the maximum diameter section of the braided pipe network 3 in the use state is preferably greater than 0 mm and less than or equal to 10 mm; in the fourth aspect, when an accident occurs, such as stone incarceration, the outer diameter of the braided pipe network 3 can be adjusted in time to quickly solve the problem. , to prevent damage to the ureteral wall, such as incomplete plugging or the outer diameter of the braided tube network 3 is too large, it can also be adjusted in time. The covered range of the membrane-like structure 32 is at least from the distal end of the braided tube mesh 3 to the maximum diameter when in use, that is, the covered range covers at least the upper half of the braided tube mesh 3, so as to ensure that the device is in the ureter when the device is in the ureter. In the use state, when water is injected into the ureter, after the water encounters the membrane structure 32 on the braided pipe network 3, it flows to the bottom of the ureter due to the resistance effect, that is, the function of the membrane structure 32 is to change the direction of the water flow, so that The water flow can entrain the stone debris and be discharged into the bladder, and under the support of the braided tube network 3, the shape of the membrane-like structure 32 is also controllable and not easily deformed, and fits with the ureteral wall, thereby achieving complete sealing and sealing. One-time stone extraction, no gravel is missed. The flexible end 42 of the inner core 4 can improve the passing performance of the instrument when it is inserted into the ureter, and reduce the probability of collateral damage.

The structural design of the limit cover 11 and the limit cover mounting hole 15 ensures that the two can be stably fixed. The structural design of the inner core fixing groove 112 and the inner core fixing ball 41 ensures that the handle 1 and the inner core 4 can be stably fixed. The push handle limit portion 163 and the push handle limit block 164 of the push handle 16 are matched with the back side of the pipe handle 2 and the limit groove 21, and the structure is simple and can ensure the stability of the pipe handle 2 and the push handle 16. fixed. The limit tube 34 can define the shape of the braided tube net 3, and the proximal end of the braided tube net 3 and the distal end of the tube handle 2 are fixed to the middle position of the limit tube 34, and the "middle section" refers to the limit. The proximal end and the distal end of the position tube 34 are removed, preferably the middle 1/3 of the limit tube 34, so that the limit tube 34 can be kept in translation during the pushing process, avoiding slight deviation. The above structural designs all make the structure of the device of the present invention compact, and further ensure that the shape of the braided tube mesh 3 can be artificially and precisely controlled.

The method of using the braided ureteral stone blocking extractor of the present invention is as follows: during ureteroscopic lithotripsy, an endoscope is first inserted to find the stone; if it is an incarcerated stone, a laser fiber can be introduced first to break the stone to It is advisable to pass the device of the present invention. If it is a non-incarcerated stone, the device of the present invention can be introduced; first, unpack the factory packaging of the braided ureteral stone blocking extractor of the present invention, hold the handle 1, and pull it toward the proximal end. The handle 16 is used to pull the braided tube mesh 3 into a state with the smallest diameter and the longest length, that is, the device is ready for use; insert the flexible end 42 of the inner core 4 into the working channel of the endoscope, and under the guidance of the endoscope, make The instrument bypasses the stone and reaches the top of the stone, and then pushes the push handle 16 to the distal end to push the braided tube mesh 3 into the state of use of the instrument; if the diameter of the stone fragments is suitable to be discharged from the ureter to the bladder, the endoscope can be used to work The channel injects water into the ureter, and drags the braided ureteral stone blocking extractor of the present invention to the proximal end, the perfusion water flow continuously impacts the membrane structure 32 in the braided pipe network 3, and the stone fragments are intercepted and flushed downward, At this time, the water flow envelops the stone fragments and is eventually dragged into the bladder; if the stone fragments are large in size and need to be further broken by introducing a laser, the limit cover 11 and the push handle 16 on the handle can be disassembled in turn. In order to realize the separation of the main body of the handle 1 from the inner core 4 and the tube handle 2, the position of the device of the present invention in the body is assisted by an assistant to fix the position of the device in the body without moving, and the operator withdraws the ureteroscope from the body and then sequentially connects the inner core 4 and the tube. The handle 2 is inserted into the handle, the push handle 16 is installed, and finally the upper limit cover 11 is installed. After the instrument is assembled, push the push handle 16 on the handle 1 until the braided mesh tube 3 is in a blocked state, and then insert the ureteroscope and introduce the optical fiber. In the lithotripsy operation, after the calculus is completely broken, the laser fiber is withdrawn, and the above operations of water injection and downward dragging of the blocking device are repeated until the calculus is completely flushed out into the bladder. During the operation, if there is an accident of stone incarceration, the push handle 16 can be adjusted in time to adjust the shape of the braided tube network 3 to alleviate the problem, and the outer diameter of the braided tube network 3 can be adjusted in time according to the circumference of the patient’s ureter to achieve tightness. Fits well without causing damage to the ureteral wall.

The shape of the braided ureteral stone blocking extractor can be controlled artificially and accurately, and it is easy to insert into the ureter, does not push the stone to retrograde to the kidney and cause damage to the ureteral wall, and can adjust the shape in time to completely block the ureter, effectively preventing Stones and stone fragments are flushed back into the kidneys by the perfusion water flow, and it is not easy to cause stone incarceration. During the process of dragging and removing stones, it is not easy to deform and rub against the ureteral wall, and all stones can be taken out at one time to achieve the purpose of efficient stone removal.

The braided ureteral stone blocking extractor of the present invention can be used not only for the blocking and removal of ureteral stones, but also for the blocking and foreign body removal of other body cavities, including but not limited to the following applications: sealing and removing kidney stones Blocking and removal, blocking and removal of vascular thrombus, blocking and hemostasis of vascular puncture hole, blocking and removal of foreign bodies in body cavity, such as treatment of foreign bodies in trachea and intestinal tract.

Example 2

The braided ureteral stone blocking extractor of this embodiment is basically the same as the braided ureteral stone blocking extractor described in Example 1, except that (see FIG. 10 , FIG. 10 is a schematic diagram of the inner core structure of Example 2 ): The inner core 4 is a homogeneous hollow tube, that is, the inner core fixing ball 41 from the distal end of the inner core 4 to the proximal end of the inner core 4, and a through cavity is provided in the center thereof. This solution needs to be used with another guide wire as a guiding instrument. The guide wire can be inserted from the side of the inner core fixing ball 41 , and the guide wire is preferably exposed to the distal end of the inner core 4 .

Example 3

The braided ureteral stone blocking extractor of this embodiment is basically the same as the braided ureteral stone blocking extractor described in Example 1, except that (see FIG. 11 , FIG. 11 is the braided pipe network structure of Example 3 Schematic diagram): in the first use state, the braided pipe net 3 has a long fusiform structure, that is, the central section is a cylinder, and the outer diameter of the cylinder is the largest. The braided tube mesh 3 of this shape has a longer maximum diameter section, which can better fit closely with the ureteral wall, and achieve better stone retention and stone incarceration prevention effects.

Example 4

Please refer to FIGS. 12 and 13 , FIG. 12 is a schematic diagram of the first use state of the braided ureteral stone blocking extractor of Example 4, and FIG. 13 is a second use of the braided ureteral stone blocking extractor of Example 4 Status diagram. The braided wire type ureteral stone blocking extractor in this embodiment is basically the same as the braided wire type ureteral stone blocking extractor described in Embodiment 1, the difference is: the metal wire 31 on the proximal side of the braided tube network 3 It is oblique cross-braided, and some of the metal wires 31 are stretched to the distal side and the adjacent metal wires 31 are intertwined with each other, and finally their distal ends converge together, that is, the metal wires 31 of the braided pipe mesh 3 are The oblique cross-braided at the proximal end transitions to the form in which two or more metal wires 31 are intertwined and supported at the distal end. The membrane-like structure 32 is covered on the distal side of the braided tube mesh 3 . In the use state, when the handle is pushed, the entire braided tube mesh 3 can be in a shuttle shape, that is, the first use state, and the proximal side of the braided tube mesh 3 can also be further pushed into the interior of the distal side, The distal end is semifusiform and the proximal end is umbrella-shaped. The advantage of this embodiment is that the braided tube mesh 3 on the distal side has stronger distraction force because the metal wires 31 are intertwined with each other, which is more conducive to maintaining the blocked shape in the ureter, and achieves a better blocking effect.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the method of the present invention, several improvements and supplements can be made, and these improvements and supplements should also be regarded as It is the protection scope of the present invention.

Claims (11)

1. a kind of lacing formula ureteral calculi stops extractor, it is used to from the ureter of patient take out calculus, feature exists In equipped with handle, Guan Bing, braiding pipe network and inner core, the braiding pipe network is tubular reticulum made of the braiding of several one metal wires And distal end is covered with membrane structure, braiding pipe network both ends pass through fixation kit respectively and are fixed on pipe handle distal end and inner core；Described Braiding pipe network does stretching motion under the drive of pipe handle, and the use state of the braiding pipe network is shuttle shape, is distally half shuttle shape And proximal end is umbrella or umbrella, wherein the wire of proximal end side is that skew crossing weaves, and several metals therein Silk elongation is to distal end side and adjacent wire is mutually wound, its final distal end is gathered together.

2. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the wire Radical is the integer between 4~200, and the braiding pipe network can be by equal diameter wire or two kinds and two or more straight Diameter wire interval weaves.

3. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the inner core and pipe Position-limiting tube is arranged between handle, the middle section of the position-limiting tube is solid by fixation kit and braiding pipe network proximal end and pipe handle distal end It is scheduled on together, the distal end of the position-limiting tube is free end.

4. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the handle is equipped with Limit sliding chutes are equipped with push handle in the limit sliding chutes；The installing pipe that the inner core proximal end is inserted in handle is intracavitary and interior Core is mutually fixed with handle；The pipe sleeve is connected to the outside of inner core, and pipe handle proximal end be inserted in handle installing pipe it is intracavitary simultaneously It is mutually fixed with push handle.

5. lacing formula ureteral calculi according to claim 4 stops extractor, which is characterized in that the push handle is equipped with Push handle pushing block, the push handle pushing block lower section are equipped with slider bar, and the both side edges below the slider bar are respectively provided with an arc Push handle limiting section, the lower edge of each push handle limiting section is respectively equipped with push handle limited block again；The pipe handle proximal end is equipped with limit Slot；The push handle limited block is embedded in limiting slot, and the push handle limiting section is attached at the back side of pipe handle.

6. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the handle proximate end End face is equipped with limited cover；The limited cover is equipped with limited cover rear cover, and the limited cover rear cover inner wall is fixed equipped with inner core Groove；The inner core proximal end is equipped with the fixed ball of inner core；The fixed ball of the inner core and inner core fixed groove, which match, to be made Inner core is obtained mutually to fix with handle.

7. lacing formula ureteral calculi according to claim 6 stops extractor, which is characterized in that in the limited cover Wall is equipped with limited cover and installs tooth, and the handle proximate end is equipped with limited cover mounting hole, and the limited cover installation tooth is inserted in limit In the lid mounting hole of position.

8. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the membrane structure Coverage area is at least from maximum gauge when weaving pipe network distal end to use state.

9. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the inner core distal end Equipped with flexible end.

10. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that the inner core is One hollow tube.

11. lacing formula ureteral calculi according to claim 1 stops extractor, which is characterized in that when working condition, institute The maximum gauge for stating braiding pipe network is to be less than or equal to 30mm more than or equal to 5 millimeters；The length of maximum gauge section be greater than 0 millimeter, Less than or equal to 10mm.