WO2021042803A1

WO2021042803A1 - Object removal net forceps

Info

Publication number: WO2021042803A1
Application number: PCT/CN2020/095865
Authority: WO
Inventors: 双建军; 冯明浩; 胡洁; 沈正华
Original assignee: 南微医学科技股份有限公司
Priority date: 2019-09-05
Filing date: 2020-06-12
Publication date: 2021-03-11
Also published as: CN112438759A

Abstract

Disclosed is a pair of object removal net forceps, comprising a handle (1), a catheter (2), a pull cable (3), and a plurality of object removal nets (4). The pull cable (3) is arranged inside the catheter (2), with a proximal end thereof being connected to the handle (1), and a distal end thereof being connected to the plurality of object removal nets (4). Each object removal net (4) comprises a net bag (41), and a loop steel wire (42) connected to an edge of an opening of the net bag (41), wherein the loop steel wire (42) is connected to the handle (1) via the pull cable (3), such that the loop steel wire (42) is controlled by the handle (1) to generate elastic deformation in order to open or close the net bag (41); and the loop steel wire (42) is shaped into a bent structure, such that the plurality of object removal nets (4) open with a preset angle therebetween. The object removal net forceps have an improved foreign matter holding capacity due to the plurality of net bags (41), can conveniently remove foreign matter from the patient's body, is flexible in operation, and can remove a large amount of small-volume foreign matter in one step, thereby effectively reducing the number of operations needed for object removal and shortening the operation time.

Description

Net pliers for fetching

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910835972.5, and the invention title is "a kind of fetching net pliers" on September 5, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of endoscopic medical equipment, and in particular to a net forceps for retrieval.

Background technique

Object extraction net forceps or sampling forceps are a common endoscopic surgical instrument, which is widely used to separate, recover and remove tissues or foreign objects from patients. For example, in endoscopic polypectomy, the snare can pass through the endoscopic channel, and then surround the polyp and cut off the polyp by tightening the snare or turning on an active device; while the net forceps can be released to the polyp through the endoscopic clamp channel Position, grab the cut polyp, and then withdraw the net bag to take out the polyp. Since the net-removing forceps have a strong capacity to accommodate foreign objects or tissues, compared to other retrieval devices, the net-removing forceps can take out larger foreign objects or tissues.

The existing fetching net pliers includes a handle, a pull cable, a catheter, and a fetching net. The handle connects the catheter and the pull cable in the catheter to control the fetching net to perform the fetching action. When grabbing a foreign body, the net of the netting forceps needs to be tightly attached to the wall of the esophagus or intestine where the foreign body needs to be pulled so that the foreign body can enter the net bag. However, the field of vision under the endoscope is limited, and the operating space is narrow, making it difficult to close the net clamp to the wall of the digestive tract. At the same time, because the capacity of a single net bag is limited and only small foreign objects can be grasped, it cannot be grasped at one time when facing large foreign objects, which will increase the number of grasping.

In addition, since the net forceps cannot enter the endoscope forceps after grasping foreign objects, the endoscope and net forceps need to be taken out at the same time. The existing net forceps need to be grasped several times, and the endoscope must go back and forth. Entering and exiting several times will cause secondary damage to the gastrointestinal mucosa of the patient, and will also cause discomfort to the patient during the operation. Large and small foreign objects need to be grasped in stages, and the application of the existing fetching net pliers has great limitations.

Summary of the invention

The present application provides a net-grabbing forceps to solve the problem that the existing net-grabbing forceps have a small amount of grasping foreign objects in the body at one time and need to be repeatedly grasped, thereby reducing the number of grasping.

The present application provides a fetching net pliers, including: a handle, a catheter, a pull cable, and a plurality of fetching nets. Wherein, the proximal end of the catheter is connected to the handle; the pull cable is arranged inside the catheter, and the proximal end of the pull cable is connected to the handle; and a plurality of fetching nets are connected to the distal end of the pull cable.

Wherein, the fetching net includes a net bag, and a ferrule wire connected to the edge of the opening of the net bag; the ferrule wire is connected to the handle through the cable, so that the handle is used to control the production of the ferrule wire Elastically deforming, so that the opening of the net bag is opened or tightened; the ferrule wire is shaped into a curved structure, and the ferrule wire can be straightened into the duct under the traction of the cable, and Extend in the catheter and resume bending.

Optionally, the handle includes a handle body, and a control slider slidably connected to the handle body;

The handle body is a hollow tubular structure, and the handle body is fixed at the proximal end of the catheter; the control slider passes through the wall tube of the handle body, and the inside of the handle body is connected to the cable Near end.

Optionally, the handle body is provided with a plurality of the control sliders that are the same as the number of the fetching net; a plurality of pull cables are arranged inside the catheter; and the plurality of control sliders are connected to each by a pull cable. The ferrule wire is used to individually control the opening or tightening of the fetching net.

Optionally, the handle body is provided with one control slider; the ferrule wires in a plurality of fetching nets are jointly connected to the distal end of the pull cable, so that the single control slider is linked to control the The fetching net is opened or tightened.

Optionally, the handle further includes a positioning cap and a positioning block;

The handle body is connected to the catheter through the positioning cap; the positioning block has elasticity, can be clamped on the handle body, and can slide back and forth on the handle.

Optionally, the fetching net includes two sections of ferrule wires; the ferrule wire includes bending outwards relative to other fetching nets, and the two sections of ferrule steel wires of the same fetching net are mutually Separated bend.

Optionally, the outward bending angle of the ferrule wire relative to the other fetching nets is 30°-140°.

Optionally, the ferrule steel wire passes through the grid space at the edge of the opening of the net bag at intervals, and the distal end of the ferrule steel wire is fixedly connected to the net bag in a binding manner.

Optionally, the surface of the ferrule steel wire is covered with a hose, the hose can slide relative to the ferrule steel wire, and the opening edge of the net bag is fixedly connected to the pipe wall of the hose.

Optionally, the edge of the opening of the net bag is connected to the ferrule steel wire in a binding manner.

Optionally, the fetching net further includes a riveting tube, and the ferrule wire is connected to the distal end of the cable through the riveting tube.

Optionally, the fetching net pliers further includes an injection luer connector; the injection luer connector is arranged between the catheter and the handle, and the luer of the injection luer connector communicates with the catheter.

It can be seen from the above technical solutions that the present application provides an object retrieval net pliers including: a handle, a catheter, a pull cable and a plurality of retrieval nets. Wherein, the pull cable is arranged inside the catheter, the proximal end is connected with a handle, and the distal end is connected with multiple fetching nets. The fetching net further includes a net bag, and a ferrule wire connected to the edge of the opening of the net bag; the ferrule wire is connected to a handle through a cable, so that the handle controls the elastic deformation of the ferrule wire to open or tighten the opening of the net bag; The ferrule wire is shaped into a curved structure, so that a plurality of fetching nets are mutually opened at a preset angle. The retrieval net forceps provided by the present application increase the holding capacity of foreign objects through multiple net pockets, can conveniently retrieve foreign objects in a patient, have flexible operation, can grasp a large number of small-volume foreign objects at one time, effectively reduce the number of retrievals and reduce operation time.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of a net pliers for fetching objects in this application;

Fig. 2 is a schematic cross-sectional structure diagram of a net pliers for fetching objects according to the present application;

Fig. 3 is a schematic diagram of the structure of another netting pliers of the application;

Fig. 4 is a schematic cross-sectional structure diagram of another netting pliers according to the present application.

detailed description

The embodiments will be described in detail below, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements. The implementation manners described in the following examples do not represent all implementation manners consistent with this application. It is only an example of a system and method consistent with some aspects of the application as detailed in the claims.

In the technical solution provided in this application, for ease of description, the end of the entire device placed in the human body is called the distal end, and this end is mainly used to perform surgical actions on the tissue; the end outside the body is called the proximal end, and this end is mainly used Operate by the operator of the operation. Unless otherwise specified in the present application, the distal end of each component refers to the end close to the side inside the body, and the proximal end of each component refers to the end close to the side outside the body.

Refer to Fig. 1, which is a schematic diagram of the structure of a net pliers for fetching in this application. As can be seen from FIG. 1, the retrieval net pliers provided in the present application include: a handle 1, a catheter 2, a pull cable 3, and a plurality of retrieval nets 4. Wherein, the handle 1 is used for performing surgical actions, and may include a handle body 11 and a control slider 12 slidably connected to the handle body 11. The handle body 11 is a hollow tubular structure, and the handle body 11 is fixed at the proximal end of the catheter 2; the control slider 12 passes through the wall tube of the handle body 11 and is located inside the handle body 11 Connect the proximal end of the cable 3.

It should be noted that in the technical solution provided by this application, the net structure referred to in the fetching net 4 has a broad sense. As long as the fetching net 4 can prevent the penetration of foreign objects, it belongs to the protection scope of this application. That is, the fetching net 4 includes both a mesh hollow structure in the traditional sense and a polymer membrane structure. Among them, the polymer membrane structure can permeate some substances (such as liquid), or it can prevent any substance from permeating.

In practical applications, the inner core of the handle body 11 is provided with a cavity for introducing the proximal end of the cable 3. The control slider 12 can slide on the handle body 11, and pass through the chute on the handle body 11 to connect the proximal end of the cable 3 to pull the cable 3 to move, and the fetching net 4 completes the opening and closing. In order to facilitate the operation, the control slider 12 can also be provided with operating components. The operating components can be two circular rings provided on the slider, and a circular ring is also provided on the end of the handle body 11. In practical applications, the slider The two rings on the top can be used to insert two fingers, such as the index finger and the middle finger, respectively; the ring on the end is used to insert the thumb, and the control slider 12 can be moved by the force of the kneading of the fingers.

Further, the handle 1 further includes a positioning cap 13 and a positioning block 14; the handle body 11 is connected to the catheter 2 through the positioning cap 13; the positioning block 14 is elastic and can be clipped to the handle The main body 11 can be slid back and forth on the handle body 11. The positioning cap 13 can fix the catheter 2 and the handle body 11 through a threaded connection or a glued connection. The positioning block 14 can not only slide on the handle body 11, but also can be fixed at any position on the handle body 11, thereby limiting the position of the control slider 12 and facilitating the implementation of surgical operations. In addition, in order to facilitate positioning control, the implementation handle body 11 may also be provided with a scale mark to determine different positioning distances for different patient conditions, so as to adjust the position of the positioning block 14. In addition, in this embodiment, after a foreign object is covered in one net bag 41, the position of the net bag 41 can be fixed by the corresponding slider to prevent loosening and causing the foreign object to fall off; at this time, other sliders can be conveniently operated to control another The net bag 41 performs fetching.

The proximal end of the catheter 2 is connected to the handle 1. In practical applications, one end (proximal end) of the catheter 2 is located outside the patient's body, and the other end (distal end) extends into the patient's body. The catheter 2 may be a plastic hose, and optionally a spirally extending support spring is arranged inside it, so that the catheter 2 can still maintain a tubular state when being squeezed by the tissues of the sidewall of the digestive tract, so as to avoid affecting the actions of internal devices.

As shown in FIG. 2, the cable 3 is arranged inside the catheter 2, and the proximal end of the cable 3 is connected to the handle 1. The cable 3 serves as an action transmission component, which can transmit the force applied by the operator to the retrieval net 4 at the distal position. Therefore, the length of the cable 3 is greater than the length of the catheter 2. In practical applications, the cable 3 can be a stainless steel multi-strand wire or a single wire to be able to transmit thrust and tension.

A plurality of fetching nets 4 are connected to the distal end of the cable 3. In the technical solution provided by this application, the fetching net 4 includes a net bag 41 and a ferrule wire 42 connected to the edge of the opening of the net bag 41; the ferrule wire 42 is connected to the handle 1 through the cable 3 , In order to control the elastic deformation of the ferrule wire 42 through the handle 1 to open or tighten the opening of the net bag 41; the ferrule wire 42 is shaped into a curved structure, so that the ferrule wire 42 It can be straightened into the catheter 2 under the traction of the cable 3, and can be stretched out of the catheter 2 to resume bending.

In practical applications, the ferrule wire 42 can be gathered in the catheter 2 before performing the operation, and under the restriction of the wall of the catheter 2, it can be in a straight state. When foreign objects need to be stored, the sliding block on the handle 2 can be pushed to the distal end to push the ferrule wire 42 out of the catheter 2. Since the catheter 2 no longer restricts the ferrule wire 42, the ferrule wire 42 will be restored to a fixed curved shape under the action of elastic force. The shaped and curved shape can expand the opening of the retrieval net 4 to increase the retrieval area and facilitate retrieval.

It can be seen that in the present application, by shaping the ferrule wire 42 into a curved structure, the retrieval net 4 can be folded in the catheter 2, so as to facilitate the catheter 2 to walk in the forceps of the endoscope and facilitate the retrieval of the retrieval net. The forceps are inserted into the human body through an endoscope to perform the operation. It is also possible to expand the opening of the fetching net through a shaped curved structure, and to form a structure in which a plurality of fetching nets are open to each other, which is convenient for fetching and reduces the operation difficulty of the operation.

In some embodiments of the present application, the fetching net 4 includes two sections of ferrule steel wire 42; the bending structure of the ferrule steel wire 42 includes the outward bending relative to the other fetching nets 4, and the same The two sections of the ferrule wire 42 of the material net 4 are bent apart from each other. Wherein, the angle between the fetching nets 4 outwardly bends, so that an open opening can be formed between the fetching nets 4, so that foreign objects can be collected between the two fetching nets 4 through the opened opening. Obviously, in this embodiment, the outward bending angle of the ferrule wire 42 with respect to the other fetching nets 4 should not be too small, so that the fetching net 4 can collect larger foreign matter. Further, the ferrule wire 42 The outward bending angle of the fetching net 4 should not be too large to ensure that the fetching steel wire 42 can be completely retracted into the catheter 2.

Taking two fetching nets 4 as an example, the outward bending angle of the ferrule wire 42 of one fetching net 4 relative to the ferrule wire 42 of the other fetching net 4 is 30°-140°. That is, the outward bending angle of the ferrule wire 42 of each fetching net 4 is 15°-70°. Such an angle can not only meet the fetching requirements of most foreign objects, but also make the ferrule wire 42 fully maintain elasticity. Can be straightened, tightened and restored to bend.

It should be noted that in this application, the retrieval net 4 includes two sections of ferrule wires 42 means that in actual application, each retrieval net 4 can be composed of two ferrule wires 42, and The distal end of the ferrule wire 42 is connected by components such as a head end cap, or two ferrule wires 42 are directly welded to form at the distal end. It can also be formed by bending a ferrule wire 42, that is, by bending the middle part of a ferrule wire 42 to maintain the distal bending structure, so that the two ferrule wires 42 on both sides of the distal end can produce It is elastically deformed, so that the opening of the fetching net 4 is folded and opened.

Further, in order to achieve control of the fetching net 4, the fetching net 4 further includes a riveting tube 43, and the ferrule wire 42 is connected to the distal end of the cable 3 through the riveting tube 43.

It can be seen from the above technical solutions that in actual work, the distal end of the retrieval net pliers is first extended into the clamp channel of the endoscope, and then the distal end of the retrieval net pliers is placed at the target position. , Position the positioning block 14 to the required scale, and the positioning block 14 can act as a stop for the control slider 12. Then slowly push out the control slider 12, the booster tube fixed on the control slider 12 can push the cable 3, so that the cable 3 pushes the ferrule wire 42 riveted to it, and the ferrule wire 42 drives the net pocket 41 compressed in the duct 2 , The entire fetching net 4 is pushed out of the catheter 2, and is fully expanded by the elastic force of the ferrule wire 42.

Then adjust the opening of the fully opened net bag 41 to an appropriate position to ensure that the foreign matter has been between the openings of the net bag 41. Pull back the control slider 12 slowly. At this time, the booster tube drives the cable 3, and the cable 3 drives the ferrule wire 42 to shrink the opening of the net bag 41. The foreign matter is pushed into the inside of the retrieval net 4 by the edge of the ferrule wire 42, and then is tightly wrapped in the retrieval net 4. The retrieval net 4 wrapped with the foreign body will be clamped to the distal end of the catheter 2, and at this time, the entire retrieval net forceps and the endoscope are pulled out together. After pulling it out, put the net bag 41 wrapped with foreign objects into a specimen bottle or other collection container, and then slowly push out the control slider 12, and the fetching net 4 is opened again to make the removed foreign objects fall into the container, and the operation ends. If you need to take out the foreign body again, you can first put the retrieval net 4 into the catheter 2, and then extend the retrieval net forceps into the endoscope forceps to repeat the above operation, if not needed, complete retrieval.

In the technical solution provided by the present application, two or more fetching nets 4 can be arranged at the distal end of the cable 3 to increase the amount of foreign bodies captured each time and increase the ability to capture large-volume foreign bodies. . Taking the case of two fetching nets 4 as an example, this application uses the following embodiments to illustrate the control form of the pull cable 3 on the two fetching nets 4, that is, the fetching net 4 can be controlled by a single handle and a single control slider. Two net pockets 41 enter and exit the duct 2 at the same time; two control sliders 12 can also be used to control the two fetch nets 4 respectively, so that the operation of the entire fetch net pliers is flexible and has good adaptability.

That is, in an embodiment of the present application, as shown in Figures 1 and 2, the handle body 11 is provided with a control slider 12; the ferrule wires 42 in the plurality of fetching nets 4 are commonly connected to each other. The distal end of the cable 3 is linked to control the opening or tightening of the fetching net 4 through a single control slider 12.

In actual application, the ferrule wire 42 is riveted with the cable 3 through the riveting tube 43, the cable 3 is wrapped in the pipe 2, and the pipe 2 is glued to the nut, and is threaded to the positioning cap 13 through the nut, and the positioning cap 13 is connected to the handle. The main body 11 is fixed by a groove. The positioning block 14 has certain elasticity, can be clamped on the handle body 11, and can slide relatively. The control slider 12 cooperates with the handle body 11 to control the fetching action. The control slider 12 can also slide back and forth on the handle body 11. The control slider 12 can be riveted with the booster tube inside the handle body 11 to realize the connection with the cable 3 and complete the assembly.

During the operation, the size of the foreign body can be initially determined through an endoscope or imaging equipment, and then the retrieval net 4 can be contracted in the catheter 2 by pulling back the control slider 12, and then the retrieval net 4 can be removed through the endoscope clamp channel. Place it in the target location. Then push the control slider 12 to the position of the positioning block 14 to fully open the fetching net. Then slowly pull back the control slider 12 to shrink the fetching net 4 to wrap the foreign objects, and then push the positioning block 14 to the target scale for positioning to prevent the control slider 12 from sliding when the finger is released. The net 4 will be stuck at the distal end of the catheter 2. Finally, slowly pull out the entire net forceps and the endoscope to remove the foreign body outside the body. If necessary, the retrieval net 4 can be retracted into the catheter 2 first, and then the retrieval net forceps can be extended into the endoscope forceps channel to retrieve the object.

In another embodiment of the present application, as shown in FIGS. 3 and 4, the handle body 11 is provided with a plurality of the control sliders 12 in the same number as the fetching net 4; A plurality of pull cables 3; a plurality of the control sliders 12 are respectively connected to each ferrule wire 42 through the pull cables 3 to individually control the opening or tightening of the fetching net 4.

During the actual operation, first determine the size of the foreign body through the endoscope or imaging equipment, and then select the opening angle of the two retrieval nets 4 according to the needs, and then pull back the two control sliders 12 to determine the contraction of the retrieval net Inside the catheter 2. Place it to the target location through the endoscope clamp channel. Push the control slider 12 to the preset scale position to fully open the fetching net, and then slowly pull back the control slider 12 to shrink the fetching net 4 to wrap the foreign objects. Similarly, the positioning block 14 needs to be pushed to the target scale to prevent the control slider 12 from sliding when the finger is released. At this time, the retrieval net 4 containing foreign objects will be stuck at the distal end of the catheter 2, and finally the entire equipment and endoscope of the retrieval net bag are slowly pulled out, and the retrieval is completed.

In the technical solution provided by the present application, the ferrule wire 42 can be elastically deformed under the pulling force of the cable 3, thereby controlling the opening and closing of the net bag 41. Therefore, the ferrule wire 42 and the opening edge of the net bag 41 must be able to produce a certain amount of relative sliding to ensure the flexibility of the opening and closing process of the net bag 41. Therefore, the ferrule wire 42 and the net bag 41 41 The connection mode of the edge of the opening includes but not limited to the following three forms:

That is, in an embodiment of the present application, the ferrule wires 42 pass through the grid space at the edge of the opening of the net bag 41 at intervals, and the distal end of the ferrule wires 42 is fixedly connected to the net bag 41 by means of tying. That is, in this embodiment, the ferrule wire 42 passes through the grid space at intervals to connect the opening edges of the entire net bag 41 in series. At this time, it is necessary to fix the net bag 41 and the ferrule wire 42 at the foremost end of the ferrule wire 42. The specific fixing method can be a wire binding method. Furthermore, the net bag 41 is opened when the ferrule wire 42 is elastically deformed, and the net bag 41 is tightened after the ferrule wire 42 recovers its shape.

In an embodiment of the present application, the surface of the ferrule steel wire 42 is covered with a hose, and the opening edge of the net bag 41 is fixedly connected to the pipe wall of the hose. The hose covered on the ferrule wire 42 may be a polymer tube made of plastic material, which can be flexibly controlled with a lower tube body hardness, and then the net bag 41 and the polymer tube are heat-melted and fixed on the ferrule wire 42. When the ferrule wire 42 is elastically deformed and bent, the opening edge of the net bag 41, the hose, and the ferrule wire 42 are thermally fused together, so that the ferrule wire 42 can support the polymer tube, and the polymer tube is also deformed. The net bag 41 is driven to open, and after the ferrule wire 42 returns to its shape, the polymer tube also returns to its shape, so that the net bag 41 is tightened.

In an embodiment of the present application, the edge of the opening of the net bag 41 is connected to the ferrule wire 42 in a binding manner. The net bag 41 and the ring wire 42 are fixed by a binding method, and the net bag 41 can be tied up along the edge of the ring wire 42 with a thin nylon rope. Similarly, the net bag 41 can be opened when the ferrule wire 42 is elastically deformed, and the net bag 41 can be tightened after the loop wire 42 is restored to its shape.

It should be noted that, in the technical solution provided in this application, if a separate control method is adopted between multiple fetching nets 4, the control slider 12 can be set on one handle 1, or they can be set on two or two respectively. More than two handles 1. In practical applications, it is preferably made on a handle 1 to achieve the purpose of simplifying the structure and convenient operation.

Further, in some embodiments of the present application, the fetching net pliers further includes an injection luer connector 5; the injection luer connector 5 is arranged on the catheter 2, and the inner part of the injection luer connector 5 The cavity communicates with the conduit 2. In actual application, the ferrule wire 42 is riveted with the cable 3 through the riveting tube 43, the cable 3 is wrapped in the pipe 2, the pipe 2 is glued to the nut, the nut is glued to the injection luer connector 5, and the injection luer connector 5 Then it is fixed with the handle body 11 through the groove, and the assembly is completed. During the whole extraction process, injection can be carried out through the injection luer connector 5, so that multiple net pockets 41 can be pushed out of the catheter 2 to reduce the friction of the contact part, and the corresponding medical solution, physiological saline or other can be delivered when the operation requires liquid.

It can be seen from the above technical solutions that the present application provides a netting pliers including: a handle 1, a catheter 2, a pull cable 3, and a plurality of nets 4 for retrieval. Wherein, the cable 3 is arranged inside the catheter 2, the proximal end is connected to the handle 1, and the distal end is connected to a plurality of fetching nets 4. The fetching net 4 further includes a net bag 41 and a ferrule wire 42 connected to the edge of the opening of the net bag 41; the ferrule wire 42 is connected to the handle 1 through the cable 3, so that the handle 1 controls the ferrule wire 42 to produce elastic deformation, and The opening of the net bag 41 is opened or tightened; the ferrule steel wire 42 is shaped into a curved structure, so that a plurality of fetching nets are mutually opened at a predetermined angle. The retrieval net forceps provided by the present application increase the holding capacity of foreign objects through multiple net pockets, can conveniently retrieve foreign objects in a patient, have flexible operation, can grasp a large number of small-volume foreign objects at one time, effectively reduce the number of retrievals and reduce operation time.

The similar parts between the embodiments provided in this application can be referred to each other. The specific implementations provided above are only a few examples under the general concept of this application, and do not constitute a limitation of the protection scope of this application. For those skilled in the art, any other implementation manners expanded according to the scheme of this application without creative work shall fall within the protection scope of this application.

Claims

An object fetching net pliers, characterized in that it comprises:

Handle(1);

A catheter (2), the proximal end of which is connected to the handle (1);

The pull cable (3) is arranged inside the catheter (2), and the proximal end of the pull cable (3) is connected to the handle (1);

A plurality of fetching nets (4) connected to the distal end of the pulling cable (3);

Wherein, the fetching net (4) includes a net bag (41), and a ferrule wire (42) connected to the edge of the opening of the net bag (41); the ferrule wire (42) passes through the cable (3) ) Connect the handle (1) to control the ferrule wire (42) to produce elastic deformation through the handle (1) to open or tighten the opening of the net bag (41); the ferrule wire (42) Shaped into a curved structure, the ferrule wire (42) can be straightened into the duct (2) under the traction of the cable (3), and stretched in the duct (2) Out of recovery bend.
The net pliers according to claim 1, wherein the handle (1) comprises a handle body (11), and a control slider (12) slidably connected to the handle body (11);

The handle body (11) is a hollow tubular structure, and the handle body (11) is fixed at the proximal end of the catheter (2); the control slider (12) passes through the wall of the handle body (11) A tube is connected to the proximal end of the cable (3) inside the handle body (11).
The fetching net pliers according to claim 2, characterized in that, the handle body (11) is provided with a plurality of the control sliders (12) that are the same in number as the fetching net (4); the catheter ( 2) Multiple cables (3) are provided inside; multiple control sliders (12) are respectively connected to each ferrule wire (42) through cables (3) to individually control the fetching net (4) ) Open or tighten.
The fetching net pliers according to claim 2, characterized in that, the handle body (11) is provided with a control slider (12); a plurality of fetching nets (4) in the ferrule wire ( 42) The distal ends of the pull cables (3) are jointly connected to control the opening or tightening of the fetching net (4) through a single control slider (12).
The fetching net pliers according to claim 1, characterized in that, the fetching net (4) includes two sections of ferrule steel wire (42); The outward bending of the net (4) and the separation of the two ferrule steel wires (42) of the same fetching net (4).
The fetching net pliers according to claim 5, characterized in that the outward bending angle of the ferrule wire (42) relative to the other fetching nets (4) is 30°-140°.
The netting pliers according to claim 1, wherein the ferrule wires (42) pass through the grid space at the edge of the opening of the net bag (41) at intervals, and the ferrule wires (42) The distal end of the net bag (41) is fixedly connected to the net bag (41) by means of strapping.
The fetching net pliers according to claim 1, wherein the surface of the ferrule wire (42) is covered with a hose, and the opening edge of the net bag (41) is fixedly connected to the pipe wall of the hose .
The netting pliers according to claim 1, characterized in that the opening edge of the net bag (41) is connected to the ferrule wire (42) by means of binding.
The fetching net pliers according to claim 1, wherein the fetching net (4) further comprises a riveting tube (43), and the ferrule steel wire (42) is connected to the riveting tube (43) through the riveting tube (43). The distal end of the cable (3).