CN107684452B

CN107684452B - Catching device

Info

Publication number: CN107684452B
Application number: CN201610638920.5A
Authority: CN
Inventors: 陈卓; 罗洪兵
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2016-08-04
Filing date: 2016-08-04
Publication date: 2021-05-07
Anticipated expiration: 2036-08-04
Also published as: CN107684452A

Abstract

The invention provides a capturing device which comprises a capturing ring and a control lever, wherein the control lever comprises a control section and a soft section connected between the control section and the capturing ring, and the soft section is easier to deform than the control section under the action of the same external force. Compared with the capturing ferrule in the prior art, the control lever of the capturing device comprises the soft section which is easier to deform than the control section, when the pushing force of the pushing control lever is too large, the soft section can be pressed, bent and deformed to ensure that the capturing ring cannot continuously advance to compress the filter, the possibility that the capturing ring captures a fixed anchor or a supporting rod of the filter is reduced, and the safety of clinical operation is improved.

Description

Catching device

Technical Field

The invention relates to the field of medical instruments, in particular to a catcher.

Background

Pulmonary Embolism (PE) is a common disease with high mortality. According to data statistics, the death rate of untreated pulmonary embolism is 20% -30%, and the new cases account for about 0.2% of the population each year. China is calculated by 13.5 hundred million people, and about 270 million new patients are added each year. The vena cava filter (hereinafter referred to as filter) is clinically proved to be a safe and effective means for preventing pulmonary embolism, and can reduce the incidence rate of the pulmonary embolism. The filter is placed in the inferior vena cava to prevent emboli shed by the lower extremities from reaching the lungs along the bloodstream, thereby preventing pulmonary embolism.

Clinically, the risk of pulmonary embolism after a period of filter implantation into a patient is reduced or eliminated with treatment, and the filter needs to be removed from the patient to prevent the risk of long-term implantation, thus requiring a device for recovering the vena cava filter.

Referring to fig. 1, the vena cava filter 200 is currently recovered clinically using a capture device 400, where the capture device 400 includes a capture collar and a lever connected to the capture collar. However, in the case of the capture device 400 in clinical use, when the operator pushes the operating rod of the capture device 400 to make the capture collar sleeve the recovery hook of the filter, the capture collar may compress the filter in the circumferential direction and move along the filter due to the excessive pushing force, and the capture collar is guided to capture the fixed anchor or the support rod of the filter, thereby leading to the recovery failure of the filter, and increasing the risk of operation.

Disclosure of Invention

Based on this, there is a need to provide a catch which improves the safety of clinical operation.

The invention provides a catcher which comprises a catching ring and a control lever, wherein the control lever comprises a control section and a soft section connected between the control section and the catching ring, and the soft section is easier to deform than the control section under the action of the same external force.

In one embodiment, the flexible section is a spring tube.

In one embodiment, the operating rod further comprises a retaining member disposed at the proximal end of the operating section.

In one embodiment, the release preventing member is spherical.

In one embodiment, the catcher further comprises a clamping member arranged at the proximal end of the catcher, the clamping member comprises a main body section with an inner cavity and a hollow clamping section arranged at the distal end of the main body section and communicated with the inner cavity of the main body section, the side wall of the clamping member is provided with a plurality of grooves communicated with the inner cavity of the clamping section, each groove penetrates through the side wall of the clamping section and part of the side wall of the main body section, the anti-release member can move from the distal end of the inner cavity of the clamping section to the proximal end of the inner cavity of the clamping section in a natural state, the inner diameter of the clamping section is reduced under the action of radial external force, and the anti-release member is clamped by the clamping section and cannot be released from the distal end of the clamping section.

In one embodiment, the inner wall of the clamping member extends towards the inner cavity of the clamping member to form a hollow annular boss, the length of the annular boss along the axial direction of the clamping member is gradually reduced from outside to inside, and under the action of a radial external force, the anti-release member is clamped by the annular boss and cannot be separated from the annular boss.

In one embodiment, the capture ring has a circumscribing circle diameter of 8 mm to 30 mm.

In one embodiment, a portion of the capture ring is recessed radially outward to form a capture groove.

In one embodiment, the capturing device further comprises at least one connecting rod, two ends of the connecting rod are connected with the capturing ring, and a connecting line of the two ends of the connecting rod is located in the capturing ring.

In one embodiment, the operating lever is connected to the middle of the connecting rod or to one end of the connecting rod.

In one embodiment, the catcher comprises a plurality of connecting rods, one end of each connecting rod is connected with the catching ring, and the other ends of all the connecting rods are gathered together.

In one embodiment, all the connecting rods are gathered together and then connected to the operating rod.

In one embodiment, the angle between the connecting line of the two ends of the connecting rod and the longitudinal central axis of the operating lever is in the range of 30-150 degrees.

In one embodiment, an included angle between a connecting line of two ends of the connecting rod and the longitudinal central axis of the operating lever is 90 degrees.

In one embodiment, the catcher comprises a plurality of connected catch rings, each catch ring comprises a connecting rod and a catching section connected with the connecting rod, the connecting rods of two adjacent catch rings are at least partially shared, and the plurality of catching sections form the catching ring of the catcher.

In one embodiment, the lever is connected to a connecting rod of the catch ring.

In one embodiment, the two ends of the connecting rod of the catcher are at an angle in the range of 30 to 150 degrees with the longitudinal central axis of the joystick.

In one embodiment, the line connecting the two ends of the connecting rod of the catcher forms an angle of 90 degrees with the longitudinal central axis of the operating rod.

Compared with the prior art, the control lever of the capturing device comprises the soft section which is easier to deform than the control section, when the pushing force of the control lever is too large, the soft section can be pressed, bent and deformed to ensure that the capturing ring cannot continuously advance to compress the filter, the possibility that the capturing ring captures a fixed anchor or a supporting rod of the filter is reduced, and the safety of clinical operation is improved.

Drawings

Fig. 1 is a schematic view of a prior art catch filter;

figure 2 is a schematic view of a grabber provided in accordance with one embodiment of the present invention;

figure 3 is a schematic view of another angle of the catch of figure 2;

figure 4 is a side view of the grabber at the angle shown in figure 3;

figure 5 is a schematic view of a catch ring of the catch in figure 3;

figure 6 is a schematic view of the catch filter of figure 3;

figure 7 is a schematic view of a catch according to another embodiment of the present invention;

figure 8 is a schematic view of a catch according to a further embodiment of the invention;

figure 9 is a side view of the catch of figure 8;

figure 10 is a schematic view of a catch according to a further embodiment of the present invention;

figure 11 is a side view of the catch of figure 10;

figure 12 is a schematic view of a catch provided in accordance with a further embodiment of the invention;

figure 13 is a schematic view of part of the construction of the catch of figure 12;

figure 14 is a schematic view of a capture filter of the capture of figure 12;

figure 15 is a schematic view of the handle of the catch of figure 12;

figure 16 is a cross-sectional view of the catch of figure 12.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

In the field of intervention, the end proximal to the operator is generally referred to as the proximal end, and the end distal to the operator is generally referred to as the distal end.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2 together, a trap 100 for a filter 200 according to an embodiment of the present invention includes a trap ring 11, a lever 13 connected to the trap ring 11, a plurality of connecting rods 15 connected between the trap ring 11 and the lever 13, and a handle 17 connected to a proximal end of the lever 13. The joystick 13 and handle 17 are used to steer the entire trap 100. The handle 17 is connected to the catch ring 11 via the lever 13.

Referring also to fig. 3-5, a capture ring 11 is attached to the lever 13. The catching ring 11 is a closed ring structure and has elasticity, and the diameter of a circle enclosed by the catching ring ranges from 8 mm to 30 mm. When the diameter of the enclosing circle of the catching ring 11 is less than 8 mm, the catching ring 11 is not easy to catch the filter 200, so that the hand feeling of an operator for catching the filter is influenced, and the operation efficiency is reduced; when the diameter of the enclosing circle of the capturing ring 11 is larger than 30 mm, the circumference of the capturing ring 11 is difficult to be effectively reduced, and in the process of capturing the filter 200, the capturing ring 11 easily penetrates through the gap between the filter 200 and the vessel wall to capture a fixed anchor or a fixed rod of the filter 200, so that the difficulty of the filter entering a sheath tube is increased, the capturing efficiency is reduced, and the operation time is prolonged. In particular, the "enclosing circle" in the present invention means a circle (i.e., a circumscribed circle) intersecting each vertex of the capturing ring, and when there is no circle intersecting each vertex of the capturing ring, the "enclosing circle" in the present invention means a circle drawn by taking a connecting line of two points at the farthest distance on the capturing ring as a diameter and taking the center of the connecting line of the two points as a center of the circle. In the embodiment, the projection of the capture ring 11 on the section perpendicular to the length direction of the operating rod 13 surrounds the projection of the far end of the operating rod 13 on the same section; the catching ring 11 is a circular ring whose enclosing circle has a diameter equal to that of the catching ring 11 and whose enclosing circle has a diameter of 30 mm.

The number of connecting rods 15 ranges from 2 to 6. One end of each connecting rod 15 is connected with the catching ring 11, and the other ends of the connecting rods 15 are gathered together. The angle A between the connecting line of the two ends of each connecting rod 15 and the longitudinal central axis of the operating rod 13 is in the range of 30-150 degrees. In this embodiment, the number of the connecting rods 15 is 4, and the other ends of the connecting rods 15 are gathered together and then connected with the operating rod 13; each connecting rod 15 is a straight rod and has equal length; the connecting rods 15 and the catching ring 11 are positioned in the same plane, connecting lines at two ends of each connecting rod form the radius of the catching ring 11, and an included angle between the connecting lines at two ends of each connecting rod and the longitudinal central axis of the operating rod 13 is 90 degrees; the connecting rods 15 are arranged in a central symmetrical manner about the longitudinal center axis of the operating lever 13.

It will be appreciated that in other embodiments, the line connecting the two ends of each connecting rod 15 may be at an angle of 30 degrees or 150 degrees to the central longitudinal axis of the operating rod 13. It will also be appreciated that in other embodiments, the lever 13 may be attached to the capture ring 11 and may be attached to a connecting rod 15. It is also understood that in other embodiments, at least one of the plurality of connecting rods 15 may include a straight segment, a curved segment, or a broken segment. It is also understood that in other embodiments, at least one of the connecting rods 15 may be a curved rod or a broken-line rod. It is also understood that, in other embodiments, the lengths of the connecting lines at the two ends of at least two connecting rods 15 in the plurality of connecting rods 15 may not be equal. It can also be understood that in other embodiments, the connecting rods 15 and the capturing ring 11 are in the same plane, the capturing ring 11 may also be an elliptical ring, and a connecting line of two ends of at least one connecting rod 15 forms a long axis or a short axis of the elliptical capturing ring, so that the function of the connecting rod 15 for supporting the capturing ring 11 can also be realized.

It is also understood that in other embodiments, the number of the connecting rods 15 of the capturing device 100 may also be one, both ends of the connecting rod 15 are connected to the capturing ring 11, and the connecting line of both ends of the connecting rod 15 is located in the capturing ring 11, so that the function of the connecting rod 15 for supporting the capturing ring 11 can also be realized, for example, the capturing ring 11 is a circular structure, the connecting rod 15 coincides with a certain diameter of the capturing ring 11, the connecting point of the connecting rod 15 and the capturing ring 11 is connected to the operating rod 13, or the operating rod 13 is connected to the middle of the connecting rod 15, or the operating rod 13 is connected to the capturing ring 11 and is far away from the connecting rod 15; for example, the catching ring 11 is square, oval or the like, the connecting rod 15 is overlapped with a certain symmetrical axis of the catching ring 11, the connecting rod 15 is connected with the operating rod 13 at the connecting part of the catching ring 11, the operating rod 13 is connected with the middle part of the connecting rod 15, or the operating rod 13 is connected with the catching ring 11 and is far away from the connecting rod 15. It is also understood that, in other embodiments, both ends of each connecting rod 15 in the plurality of connecting rods 15 may be connected to the capturing ring 11, and a connecting line between both ends of each connecting rod 15 is located in the capturing ring 11, which also can achieve the function of the connecting rod 15 supporting the capturing ring 11, for example, a plurality of ends of the plurality of connecting rods 15 are distributed on the capturing ring 11 at intervals, a position where a certain connecting rod 15 is connected to the capturing ring 11 is connected to the operating lever 13, or the operating lever 13 is connected to the middle of a certain connecting rod 15; for example, one end of at least two connecting rods 15 of the plurality of connecting rods 15 converges on the catching ring 11, and the connecting position of a certain connecting rod 15 and the catching ring 11 is connected with the operating rod 13, or the operating rod 13 is connected to the middle part of a certain connecting rod 15, or the operating rod 15 is connected to the converging position of at least two connecting rods 15, etc.

Two adjacent connecting rods 15 and the portion of the catching ring 11 located between the respective two adjacent connecting rods 15, i.e. the catching sections 113, enclose a catching sub-ring 111, i.e. each catching sub-ring 111 comprises two connecting rods 15 and a catching section 113 connected between the two connecting rods 15. It can be understood that each of the capturing sub-rings 111 may be formed by shaping a single wire of nickel titanium or stainless steel, a plurality of strands of nickel titanium or stainless steel, or a flat ribbon of nickel titanium or stainless steel, and two adjacent connecting rods 15 of two adjacent capturing sub-rings 111 of the plurality of separately formed capturing sub-rings 111 may be at least partially coterminous by welding, sewing, braiding, heat shrinking by heat shrink, binding, welding, and the like, so that the plurality of capturing sub-rings 111 are connected together, and the capturing sections 113 of the plurality of capturing sub-rings 111 together form the capturing ring 11. It is understood that in other embodiments, the capturing ring 11 and the connecting rod 15 may be integrally formed, for example, by cutting and shaping a nickel titanium tube or a stainless steel tube, or by cutting a nickel titanium sheet or a stainless steel sheet into the capturing ring 11 and the connecting rod 15 in the same plane or cutting and shaping the capturing ring 11 and the connecting rod 15 in different planes according to actual needs.

It is understood that in other embodiments, at least one of the plurality of capturing sub-rings of the capturing device may have only one connecting rod at least partially sharing the same side with the connecting rod of its adjacent capturing sub-ring, for example, the number of capturing sub-rings of the capturing device is three, the number of connecting rods of one capturing sub-ring of the three capturing sub-rings is one, two ends of the capturing section of one capturing sub-ring of the connecting rods are respectively connected with two ends of its connecting rod, when the three capturing sub-rings are connected into a whole, the capturing sub-ring of one connecting rod is located on the same side of the other two capturing sub-rings, and the connecting rod of one capturing sub-ring of the connecting rod shares at least partially sharing the same side with the connecting rods of the other two capturing sub-rings; for example, the number of the catching sub-rings of the catching device is two, the number of the connecting rods of each catching sub-ring in the two catching sub-rings is one, and the connecting rods of the two catching sub-rings with one connecting rod are at least partially shared. It will also be appreciated that in other embodiments, the connecting rods in the catch sub-ring may also comprise straight, curved or broken line segments. It will also be appreciated that in other embodiments, the shape of the catch ring may also be rectangular, trapezoidal or other irregular shapes.

Referring to fig. 6, the process of capturing the filter includes the steps of: firstly, the catching ring 11 of the catcher 100 is conveyed to the filter 200 to be caught through the sheath 300 and is changed from a contracted state to an expanded state during the conveying process; secondly, the catching sub-ring 111 of the catching ring 11 is sleeved on the recovery hook 21 of the filter 200; then, the catching ring 11 of the catcher 100 is pulled proximally, and the moving catching ring 11 drives the filter 200 to retract into the sheath 300; finally, the filter 200 is transplanted outside the body, completing the recovery of the filter 200.

The catching ring 11 of the catching device 100 is of an annular structure supported by the connecting rod 15, so that the catching device is high in stability, not easy to deform under the scouring of blood flow, convenient for a doctor to accurately position in clinical operation and capable of improving the recovery success rate. In addition, the capture ring 11 of the inventive capture device 100 comprises a plurality of capture sub-rings 111, each capture sub-ring 111 being individually usable for capturing the vena cava filter 200. Since the diameter of the circle enclosed by the capture ring 11 ranges from 8 mm to 30 mm, the single capture sub-ring 111 is more difficult to capture the anchor 23 or support rod 25 of the vena cava filter 200 than the capture collar 400 of the prior art due to the circumference of the single capture sub-ring 111, which improves the safety of clinical operation.

Referring to fig. 7, another embodiment of the invention provides a catch 100a, substantially identical to the catch 100, comprising a catch ring 11a, except that a portion of the catch ring 11a is recessed radially outwardly to form a catch groove 113 a. In catching the filter 200, the catching grooves 113a are positioned more accurately and the catching is more firm. In the present embodiment, the catching ring 11a has four catching grooves 111 a. It is understood that in other embodiments, the catching ring 11a may have only one catching groove 111a, and may be set according to actual needs.

Referring to fig. 8 and 9, a further embodiment of the invention provides a grabber 100B, which is substantially the same as the grabber 100 and comprises a connecting rod 15B and an operating lever 13B, except that an angle B between a line connecting both ends of the connecting rod 15a and a line connecting a longitudinal central axis of the operating lever 13B is 75 degrees.

Referring to fig. 10 and 11, a further embodiment of the invention provides a grabber 100C, which is substantially the same as the grabber 100 and comprises a connecting rod 15C and an operating lever 13C, except that an included angle C between a line connecting two ends of the connecting rod 15C and a line connecting a longitudinal central axis of the operating lever 13C is 115 degrees.

Referring to fig. 12, a further embodiment of the invention provides a trap 100d, substantially identical to the trap 100, comprising a catch ring 11d, a lever 13d, a connecting rod 15d and a handle 17 d. The diameter of the circle enclosed by the catching ring 11d ranges from 8 mm to 30 mm.

Referring to fig. 13, the operating lever 13d includes a flexible section 131d connected to the catching ring 11d, a manipulating section 132d connected to a proximal end of the flexible section 131d, and a retaining member 133d fixedly disposed at a proximal end of the manipulating section 132 d. The flexible section 131d is more easily deformed than the manipulation section 132d by the same external force. The separation preventing member 133d has a spherical shape. In this embodiment, the flexible segment 131d is a spring tube, and it is understood that the flexible segment 131d may also be made of a hypotube, a flexible plastic tube, a spring, or any other material that is more easily deformable than the manipulation segment 132 d. The soft section 131d and the capturing ring 11d, and the soft section 131d and the control section 132d can be directly connected or connected through a medium by welding, riveting, sewing, heat shrinking of a heat shrink tube, binding and other processes, and only the connection part can bear certain tensile force. In this embodiment, the flexible segment 131d is connected to the convergence portion of the connection rod 15d, and the flexible segment 131d is connected to the connection rod 15d by welding.

In the process of using the existing catcher to catch the filter, when an operator pushes the operating rod to enable the catching ring to be sleeved on the recovery hook of the filter, the catching ring is caused to circumferentially compress the filter and move along the filter due to the excessive pushing force, so that the catching ring catches on the fixed anchor or the supporting rod of the filter. In the catcher 100d of the present embodiment, referring to fig. 14, due to the soft segment 131d, when the pushing force of the pushing lever 13d is too large, the soft segment 131d is pressed and bent to deform so as to ensure that the catching ring 11d does not go forward to compress the filter 200d, thereby reducing the possibility that the catching ring 11d catches the fixed anchor 23d or the supporting rod 25d of the filter 200d, and improving the safety of clinical operation.

It will be appreciated that the flexible segment 131d may also be connected to the connecting rod 15d or to the capture ring 11d by a rigid segment, said flexible segment 131d being more deformable than said rigid segment under the same external force.

Referring to fig. 15 and 16, the handle 17d includes a screw member 171d, a clamping member 172d, and a holding member 173 d. The screw member 171d is hollow and has a generally stepped interior including a threaded interior section 1712d adjacent the proximal end and having internal threads and a frusto-conical interior section 1711d adjacent the distal end and having a decreasing interior diameter from the proximal end to the distal end, the connection of the threaded interior section 1712d and the frusto-conical interior section 1711d forming a step in the interior, i.e., the threaded interior section 1712d is in communication with the frusto-conical interior section 1711d, and the distal interior diameter of the threaded interior section 1712d is greater than the proximal interior diameter of the frusto-conical interior section 1711 d. The outer diameter of the retaining member 133d of the operating lever 13d is smaller than the minimum inner diameter of the screw member 171 d.

The holding member 173d has a hollow structure, and includes a holding portion 1731d, a threaded portion 1732d and a holding portion 1733d connected in sequence from the proximal end to the distal end, wherein the threaded portion 1732d is provided with an external thread matching with the internal thread of the screw member 171 d.

Clamping member 172d is a hollow structure, and includes a main body segment 1721d and a clamping segment 1722d disposed at a distal end of main body segment 1721d, wherein an outer diameter of clamping segment 1722d is greater than an outer diameter of main body segment 1721d, so that a connection between clamping segment 1722d and main body segment 1721d forms a step. The inner wall of the retention section 1722d extends inwardly of the cavity to form a hollow annular boss 1723 d. The thickness of the annular boss 1723d in the axial direction of the clamping piece 172d gradually decreases from the outside to the inside so that the clamping section 1722d has a minimum inner diameter. The clamping section 1722d and the main body section 1721d have a plurality of slots 1724d extending along the length direction of the clamping member 172d through the inner cavity, so that the inner diameter of the clamping section 1722d can be reduced when being squeezed by an external force. When the clamping member 172d is in a natural state, the minimum inner diameter of the clamping section 1722d and the inner diameter of the main body section 1721d are both larger than the outer diameter of the anti-disengaging member 133d, and the anti-disengaging member 133d can move from the distal end of the clamping section 1722d to the inner cavity of the main body section 1721 d; when the clamping member 172d is pressed by an external force, the inner diameter of the clamping section 1722d is reduced, and the minimum inner diameter of the clamping section 1722d is smaller than the outer diameter of the anti-release member 133d, at this time, the anti-release member 133d cannot pass through the annular boss 1723d of the clamping section 1722d in the process of moving from the inner cavity of the main body section 1721d to the distal end of the clamping section 1722 d.

Referring again to fig. 16, when the trap 100d is assembled, first, the anti-release member 133d of the operating rod 13d is inserted into the lumen of the screw member 171d from the distal end of the screw member 171d, and then into the clamping member 172 d; then, the main body segment 1721d of the clamping member 172d is inserted into the abutting portion 1733d of the holding member 173d, and the proximal end of the clamping segment 1722d of the clamping member 172d abuts against the distal end of the abutting portion 1733d of the holding member 173 d; then, the screw member 171d and the holding member 173d are screwed together by the screw thread, and the truncated conical inner cavity section 1711d of the screw member 171d presses the holding section 1722d of the clamping member 172d, so that the inner diameter of the holding section 1722d is reduced, thereby fixing the detachment prevention member 133d in the clamping member 172d via the annular boss 1723 d.

The operating lever 13d and the handle 17d of the catcher 100d of the embodiment are connected through the anti-slip member 133d and the clamping member 172d, so that the operating lever 13d and the handle 17d are prevented from sliding with each other when the recovery force is too large, and even the operating lever 13d and the handle 17d are prevented from being disengaged, thereby improving the recovery success rate.

It will be appreciated that the retaining member 133d may be square, bar, triangular or any other shape that cooperates with the clamping member 172d to provide a retaining function.

It will be appreciated that the operating rod 13d may also not include the anti-slip means 133d, and the operating section 132d may be directly threaded into the lumen of the screw member 171d and clamped by the annular boss 1723 d.

It is understood that the handle 17d may not include the screw member 171d and the holding member 173d, that is, the handle 17d may include only the clamping member 172d, and only when the handle 17d is operated, the clamping member 172d is pressed by a radial external force, so that the inner diameter of the clamping section 1722d is reduced, and the operating rod 13d is clamped.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The grabber comprises an grabber ring and a control lever, and is characterized in that the grabber ring is elastic, the control lever comprises an operation section and a soft section connected between the operation section and the grabber ring, and the soft section is easier to deform than the operation section under the same external force action.

2. A catcher comprises a catching ring and a control lever, and is characterized in that the catching ring has elasticity, the control lever comprises a control section and a soft section connected between the control section and the catching ring, and the soft section is easier to deform than the control section under the action of the same external force;

the operating rod further comprises an anti-falling part arranged at the near end of the operating section;

the catcher is characterized by further comprising a clamping piece arranged at the near end of the catcher, the clamping piece comprises a main body section with an inner cavity and a hollow clamping section arranged at the far end of the main body section and communicated with the inner cavity of the main body section, the side wall of the clamping section is provided with a plurality of grooves communicated with the inner cavity of the clamping section, each groove penetrates through the side wall of the clamping section and penetrates through part of the side wall of the main body section, the anti-release piece can move from the far end of the inner cavity of the clamping section to the near end of the inner cavity of the clamping section in a natural state, the inner diameter of the clamping section is reduced under the action of radial external force, and the anti-release piece is clamped by the clamping section and cannot be separated from the far end of the clamping section.

3. The trap of claim 1 or 2, wherein the flexible section is a spring tube.

4. The trap of claim 2 wherein the anti-release member is spherical.

5. The catcher as claimed in claim 2, wherein the inner wall of said holding section extends toward the inner cavity of said holding section to form a hollow annular projection, the length of said annular projection in the axial direction of said holding section decreases from outside to inside, and said anti-slip member is held by said annular projection and cannot slip off from said annular projection by the action of a radially external force.

6. The catch according to claim 1 or 2, characterized in that the enveloping circle of the catch ring has a diameter of 8 mm to 30 mm.

7. The catch according to claim 1 or 2, wherein a portion of the catch ring is recessed radially outwardly forming a catch groove.

8. The trap according to claim 1 or 2 further comprising at least one connecting rod, wherein both ends of the connecting rod are connected to the trapping ring, and the connecting line of both ends of the connecting rod is located in the trapping ring.

9. The trap of claim 8, wherein the lever is connected to a middle portion of the connecting rod or to one end of the connecting rod.

10. The trap of claim 1 or 2, wherein the trap comprises a plurality of connecting rods, each connecting rod having one end connected to the trap ring and the other ends of all the connecting rods converging together.

11. The trap of claim 10, wherein all of the connecting rods are joined together and then connected to the operating rod.

12. The catch of claim 11, wherein a line connecting the ends of the connecting rod makes an angle with the central longitudinal axis of the lever in the range of 30 to 150 degrees.

13. The trap of claim 12, wherein a line connecting the ends of the connecting rod makes an angle of 90 degrees with the central longitudinal axis of the joystick.

14. A trap according to claim 1 or 2, wherein the trap comprises a plurality of connected trap rings, each of which comprises a connecting rod and a trapping segment connected to the connecting rod, the connecting rods of two adjacent trap rings being at least partially coterminous, the plurality of trapping segments constituting the trapping rings of the trap.

15. The trap of claim 14, wherein the lever is connected to a connecting rod of the trap ring.

16. The trap of claim 15, wherein the trap is characterized by a connecting rod having ends angled from the central longitudinal axis of the joystick in the range of 30 degrees to 150 degrees.

17. The trap of claim 16 wherein a line connecting the ends of the connecting rod of the trap makes an angle of 90 degrees with the central longitudinal axis of the joystick.