Reducing snare

Abstract

The utility model discloses a reducing snare which comprises an outer tube, a ferrule wire and an inhaul cable. The inhaul cable is arranged on the outer pipe and can move in a reciprocating mode in the length direction of the outer pipe. The ferrule wire is connected with an inhaul cable, and the inhaul cable can drive the ferrule wire to enter and exit from the outer pipe; the auxiliary wire is in sliding fit with the outer pipe, one end of the auxiliary wire is fixed to the ferrule wire, and the other end of the auxiliary wire is connected with the inhaul cable; the inhaul cable can drive the ferrule wire to enter and exit from the outer pipe through the auxiliary wire; the slidable length of the auxiliary wire is greater than that of the ferrule wire; after the ferrule wire abuts against the outer pipe, the inhaul cable can continue to push the auxiliary wire, so that the ferrule wire is further deformed. Through the arrangement, the shape of the ferrule wire can be further changed after the ferrule wire completely extends out, and then the scutching size of the ferrule wire is changed; therefore, the operation of medical staff is facilitated, the medical effect is improved, and the convenience and operability of an operation are improved.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a diameter-variable snare. Background Art

[0002] Currently, snares are mainly used to capture lesions in a patient's body and remove them from the body / move them to a different location to achieve the purpose of treatment.

[0003] The prior art with publication number CN110584749A discloses a snare for tissue resection, comprising a hollow outer tube with proximal and distal ends, a cable located in the outer tube and capable of reciprocating along its longitudinal axis, and a loop arranged at the distal end of the cable, wherein the loop is a single-strand flat wire structure, and the ratio of the cross-sectional thickness P to the height Q of the flat wire structure is 1:4 to 1:1.5, wherein the loop is axially symmetrical along the longitudinal axis, and strong bending portions are axially provided on both sides of the loop.

[0004] The opening size of the snare in the prior art is determined by the length and material of the snare loop. In order to meet the requirement of diameter change, two sets of handles need to be operated simultaneously, which is extremely inconvenient. Utility Model Content

[0005] In order to solve the problem of limited opening size of the snare in the prior art, the utility model aims to provide a variable diameter snare, which can change the opening size of the snare and improve the convenience and operability of the operation.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a variable diameter snare, comprising an outer tube, a loop wire and a cable; the cable is arranged on the outer tube, and the cable can move back and forth along the length direction of the outer tube; the loop wire is connected to the cable, and the cable can drive the loop wire in and out of the outer tube; it also includes an auxiliary wire, the auxiliary wire is slidably matched with the outer tube, one end of the auxiliary wire is fixed to the loop wire, and the other end of the auxiliary wire is connected to the cable; the cable can drive the loop wire in and out of the outer tube through the auxiliary wire; the sliding length of the auxiliary wire is greater than the sliding length of the loop wire; when the loop wire is pressed against the outer tube, the cable can continue to push the auxiliary wire to further deform the loop wire.

[0007] Preferably, the loop wire includes a first variable diameter section and a second variable diameter section; the first variable diameter section and the second variable diameter section are symmetrically arranged; the auxiliary wire includes a first auxiliary wire and a second auxiliary wire; the head of the first auxiliary wire is fixedly connected to the first variable diameter section, and the head of the second auxiliary wire is fixedly connected to the second variable diameter section; the tail of the first auxiliary wire and the tail of the second auxiliary wire are both connected to the pull cable; the auxiliary wire can drive the first variable diameter section and the second variable diameter section in and out of the outer tube, and the auxiliary wire can change the shape of the first variable diameter section and the second variable diameter section by pushing and pulling.

[0008] Preferably, the connection position between the first auxiliary wire and the first diameter-changing section is arranged near the middle position of the first diameter-changing section; the connection position between the second auxiliary wire and the second diameter-changing section is arranged near the middle position of the second diameter-changing section.

[0009] Preferably, the head of the first diameter-changing section and the head of the second diameter-changing section are fixedly connected via a bending portion; the tail of the first diameter-changing section and the tail of the second diameter-changing section are fixedly connected and slidably matched with the outer tube.

[0010] Preferably, the first auxiliary wire and the second auxiliary wire are arranged crosswise.

[0011] Preferably, the tail of the first auxiliary wire and the tail of the second auxiliary wire are fixedly connected and slidably matched with the outer tube.

[0012] Preferably, it also includes a connecting tube and a butt joint tube; the connecting tube and the butt joint tube are both slidably matched with the outer tube; the tail of the first reducing section and the tail of the second reducing section are both fixedly connected to the connecting tube, the first auxiliary wire and the second auxiliary wire are fixedly connected to the butt joint tube after passing through the connecting tube, and the butt joint tube is fixedly connected to one end of the cable.

[0013] Preferably, four through holes are provided on the connecting tube; the tail of the first reducing section and the tail of the second reducing section are respectively inserted into two symmetrical through holes; the first auxiliary wire and the second auxiliary wire pass through the two through holes and slide in cooperation.

[0014] Preferably, the head of the outer tube is a closed portion, and the inner diameter of the closed portion is smaller than the diameter of its inner hole.

[0015] Preferably, a handle is fixed to the tail of the outer tube, a slidable control slider is mounted on the handle, and the tail of the cable is connected to the control slider.

[0016] The beneficial effects of the technical solution of the utility model are: the shape of the loop wire can be further changed after the loop wire is fully extended, thereby changing the opening size of the loop wire; thereby facilitating the operation of medical personnel, improving the medical effect, and improving the convenience and operability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the variable diameter snare when the ferrule wire is extended;

[0018] Figure 2 It is a schematic diagram of the structure of the variable diameter snare when the opening width of the ferrule wire changes;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 It is a schematic diagram of the structure of the connecting pipe.

[0021] Figure numerals: 1, outer tube; 11, closing part; 2, connecting tube; 21, through hole; 3, butt tube; 4, loop wire; 41, first diameter-reducing section; 42, second diameter-reducing section; 43, bending part; 5, first auxiliary wire; 6, second auxiliary wire; 7, pull rope; 8, handle; 9, control slider; 91, first finger hole; 92, second finger hole; 93, third finger hole. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] In the following embodiments, the opening width refers to the maximum distance between the first opening width section and the second opening width section on the loop wire. Example

[0028] like Figures 1 to 4 The illustrated variable diameter snare comprises an outer tube 1, a cable 7 and a ferrule wire 4; the cable 7 is arranged on the outer tube 1, and the cable 7 can reciprocate along the length direction of the outer tube 1; the ferrule wire 4 is connected to the cable 7, and the cable 7 can drive the ferrule wire 4 to enter and exit the outer tube 1;

[0029] It also includes an auxiliary wire, which is slidably matched with the outer tube 1, one end of the auxiliary wire is fixed to the loop wire 4, and the other end of the auxiliary wire is connected to the cable 7; the cable 7 can drive the loop wire 4 in and out of the outer tube 1 through the auxiliary wire; the slidable length of the auxiliary wire is greater than the slidable length of the loop wire 4; when the loop wire 4 is pressed against the outer tube 1, the cable 7 can continue to push and pull the auxiliary wire to change the opening width of the loop wire 4. With such a configuration, the shape of the loop wire 4 can be further changed after the loop wire 4 is fully extended, thereby changing the opening width of the loop wire 4; thereby facilitating the operation of medical staff and improving the medical effect.

[0030] like Figure 2 and Figure 3 As shown, in this embodiment, the loop wire 4 includes a first diameter-reducing section 41 and a second diameter-reducing section 42; the first diameter-reducing section 41 and the second diameter-reducing section 42 are symmetrically arranged; the auxiliary wire includes a first auxiliary wire 5 and a second auxiliary wire 6; the head of the first auxiliary wire 5 is fixedly connected to the first diameter-reducing section 41, and the head of the second auxiliary wire 6 is fixedly connected to the second diameter-reducing section 42; the tail of the first auxiliary wire 5 and the tail of the second auxiliary wire 6 are both connected to the cable 7; the auxiliary wire can drive the first diameter-reducing section 41 and the second diameter-reducing section 42 to enter and exit the outer tube 1, and the auxiliary wire can change the shape of the first diameter-reducing section 41 and the second diameter-reducing section 42 by pushing and pulling. Such an arrangement can improve the uniformity of the deformation degree of the loop wire 4.

[0031] like Figure 3As shown, in this embodiment, the connection position between the first auxiliary wire 5 and the first diameter-changing section 41 is set near the middle position of the first diameter-changing section 41; the connection position between the second auxiliary wire 6 and the second diameter-changing section 42 is set near the middle position of the second diameter-changing section 42.

[0032] like Figure 2 and Figure 3 As shown, in this embodiment, the head of the first diameter-reducing section 41 and the head of the second diameter-reducing section 42 are fixedly connected by a bending section 43; the tail of the first diameter-reducing section 41 and the tail of the second diameter-reducing section 42 are fixedly connected and slidably matched with the outer tube 1. Further, the bending section 43 is U-shaped, and the opening of the bending section 43 is arranged toward the outer tube 1. The first auxiliary wire 5 and the second auxiliary wire 6 have the same length, and the first diameter-reducing section 41 and the second diameter-reducing section 42 have the same length.

[0033] like Figure 3 As shown, in this embodiment, the first auxiliary wire 5 and the second auxiliary wire 6 are arranged crosswise; when the loop wire 4 extends out of the outer tube 1, the auxiliary wire continues to push the loop wire 4 to deform, and the auxiliary wire extending from the outer tube 1 breaks away from the restriction of the outer tube 1 and then bends. Such an arrangement can not only improve the supporting effect of the loop wire 4.

[0034] In this embodiment, the tail of the first auxiliary wire 5 and the tail of the second auxiliary wire 6 are fixedly connected and slidably matched with the outer tube 1; the head of the cable 7 is fixedly connected to the auxiliary wire. Such an arrangement enables the first auxiliary wire 5 and the second auxiliary wire 6 to move synchronously, thereby improving the stability of the deformation of the loop wire 4.

[0035] In this embodiment, it also includes a connecting tube 2 and a butt-joint tube 3; the connecting tube 2 and the butt-joint tube 3 are both slidably matched with the outer tube 1; the tail of the first diameter-reducing section 41 and the tail of the second diameter-reducing section 42 are both fixedly connected to the connecting tube 2, the first auxiliary wire 5 and the second auxiliary wire 6 are fixedly connected to the butt-joint tube 3 after passing through the connecting tube 2, and the butt-joint tube 3 is fixedly connected to one end of the cable 7. Further preferably, four through holes 21 are provided on the connecting tube 2; the tail of the first diameter-reducing section 41 and the tail of the second diameter-reducing section 42 are respectively inserted into two symmetrical through holes 21; the first auxiliary wire 5 and the second auxiliary wire 6 pass through the two through holes 21 and slide in match. Further preferably, the head of the outer tube 1 is a closing portion 11, and the inner diameter of the closing portion 11 is smaller than the diameter of its inner hole. With such a configuration, the stability and synchronization of the movement of the first auxiliary wire 5, the second auxiliary wire 6, the first diameter-reducing section 41 and the second diameter-reducing section 42 are improved.

[0036] like Figure 1 and Figure 2As shown, in this embodiment, a handle 8 is fixed to the tail of the outer tube 1, a slidable control slider 9 is installed on the handle 8, and the tail of the cable 7 is connected to the control slider 9. The handle 8 is provided with a scale for judging the moving distance of the control slider 9. The control slider 9 is provided with a first finger hole 91 and a second finger hole 92, which are respectively arranged at both ends of the control slider 9, and a third finger hole 93 is provided at the tail of the handle 8.

[0037] When using the above-mentioned reducing snare, the control slider 9 is used to drive the cable 7 to move, the cable 7 pushes the connecting tube 3 to move, the connecting tube 3 pushes the auxiliary wire, the auxiliary wire pushes the loop wire 4 to extend from the outer tube 1, and the loop wire 4 drives the connecting tube 2 to slide in the outer tube 1; when the connecting tube 2 and the closing part 11 of the outer tube 1 are abutted, the connecting tube 2 stops moving. If the opening size of the loop wire 4 needs to be increased, it is necessary to continue to push the control slider 9 to move. The control slider 9 pushes the reducing section of the loop wire 4 through the auxiliary wire, so that the reducing section continues to deform, and the auxiliary wire is also bent.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A variable diameter snare, comprising an outer tube (1), a ferrule wire (4) and a cable (7); the cable (7) is arranged on the outer tube (1), and the cable (7) can reciprocate along the length direction of the outer tube (1); the ferrule wire (4) is connected to the cable (7), and the cable (7) can drive the ferrule wire (4) to enter and exit the outer tube (1); Features: It also includes an auxiliary wire, which is slidably matched with the outer tube (1), one end of the auxiliary wire is fixed to the loop wire (4), and the other end of the auxiliary wire is connected to the cable (7); the cable (7) can drive the loop wire (4) in and out of the outer tube (1) through the auxiliary wire; The slidable length of the auxiliary wire is greater than the slidable length of the loop wire (4); when the loop wire (4) is pressed against the outer tube (1), the pull cable (7) can continue to push the auxiliary wire, causing the loop wire (4) to further deform.

2. A variable diameter snare according to claim 1, characterized in that: The ferrule wire (4) comprises a first diameter-reducing section (41) and a second diameter-reducing section (42); the first diameter-reducing section (41) and the second diameter-reducing section (42) are symmetrically arranged; The auxiliary wire comprises a first auxiliary wire (5) and a second auxiliary wire (6); the head of the first auxiliary wire (5) is fixedly connected to the first diameter-reducing section (41), and the head of the second auxiliary wire (6) is fixedly connected to the second diameter-reducing section (42); the tail of the first auxiliary wire (5) and the tail of the second auxiliary wire (6) are both connected to the cable (7); The auxiliary wire can drive the first diameter-changing section (41) and the second diameter-changing section (42) to enter and exit the outer tube (1), and the auxiliary wire can change the shapes of the first diameter-changing section (41) and the second diameter-changing section (42) by pushing and pulling.

3. A variable diameter snare according to claim 2, characterized in that: The connection position between the first auxiliary wire (5) and the first diameter-changing section (41) is arranged near the middle position of the first diameter-changing section (41); and the connection position between the second auxiliary wire (6) and the second diameter-changing section (42) is arranged near the middle position of the second diameter-changing section (42).

4. A variable diameter snare according to claim 2, characterized in that: The head of the first diameter-reducing section (41) and the head of the second diameter-reducing section (42) are fixedly connected via a bent portion (43); the tail of the first diameter-reducing section (41) and the tail of the second diameter-reducing section (42) are fixedly connected and slidably matched with the outer tube (1).

5. The variable diameter snare according to claim 2, characterized in that: The first auxiliary wire (5) and the second auxiliary wire (6) are arranged crosswise.

6. A variable diameter snare according to claim 2, characterized in that: The tail of the first auxiliary wire (5) and the tail of the second auxiliary wire (6) are fixedly connected and slidably matched with the outer tube (1).

7. The variable diameter snare according to claim 2, characterized in that: It also includes a connecting pipe (2) and a butt-jointing pipe (3); the connecting pipe (2) and the butt-jointing pipe (3) are both slidably matched with the outer pipe (1); The tail of the first diameter-reducing section (41) and the tail of the second diameter-reducing section (42) are both fixedly connected to the connecting tube (2); the first auxiliary thread (5) and the second auxiliary thread (6) are fixedly connected to the butt-jointing tube (3) after passing through the connecting tube (2); and the butt-jointing tube (3) is fixedly connected to one end of the cable (7).

8. The variable diameter snare according to claim 7, characterized in that: Four through holes (21) are provided on the connecting tube (2); the tail of the first diameter-reducing section (41) and the tail of the second diameter-reducing section (42) are respectively inserted into two symmetrical through holes (21); the first auxiliary wire (5) and the second auxiliary wire (6) pass through the two through holes (21) and are slidably fitted therein.

9. The variable diameter snare according to claim 1, characterized in that: The head of the outer tube (1) is a closing portion (11), and the inner diameter of the closing portion (11) is smaller than the diameter of its inner hole.

10. The variable diameter snare according to claim 1, characterized in that: A handle (8) is fixed to the tail of the outer tube (1), a slidable control slider (9) is mounted on the handle (8), and the tail of the cable (7) is connected to the control slider (9).

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