Snare

Abstract

The utility model discloses a snare which comprises a ferrule, an inhaul cable, an outer sheath tube and an operating handle, and a sliding part is arranged on the operating handle. The near end of the ferrule is provided with an extension part formed by extending the ferrule wire; the inhaul cable comprises a first inhaul cable and a second inhaul cable which are arranged in the outer sheath tube in a penetrating mode, the far end of the first inhaul cable is fixedly connected with the extension part of the ferrule through a first butt joint pipe, the near end of the first inhaul cable is fixedly connected with the far end of the second inhaul cable through a second butt joint pipe, and the near end of the second inhaul cable is fixedly connected with the sliding part; the outer diameter of the first inhaul cable is smaller than that of the second inhaul cable, and the outer diameter of the first butt joint pipe is smaller than that of the second butt joint pipe. And the lengths of the extension part, the first butt-joint pipe and the second butt-joint pipe are respectively 5-10mm. According to the scheme, the turning performance of the snare in the extreme bending state of the far end of the endoscope is enhanced, 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 snare. Background Art

[0002] The snare is a medical surgical instrument that uses an absorbable or synthetic line to tighten a slip knot to ligate blood vessels, polyps or other pipeline structures. It is easy to operate and has been used in a variety of laparoscopic abdominal surgeries. The snare generally includes an outer sheath tube with an inner cable, a loop that can be extended is set at the distal end of the outer sheath tube, the proximal end of the outer sheath tube is connected to an operating handle, the distal end of the cable is connected to the loop, and the proximal end of the cable is connected to the sliding part on the operating handle, so that the loop can be pushed and pulled through the cable to extend and open the loop or contract and tighten the loop, or even rotate the loop to adjust its surgical posture. Most snares are inserted into the human body cavity through an endoscope to remove polyps or excess mucosal tissue. However, in some human body cavity surgeries (such as removing polyps in special parts such as the fundus of the stomach), the distal end of the endoscope will make some extreme bends with large bending angles. The existing snares are blocked or even unable to pass through the clamp channels of these curved parts of the endoscope, which is inconvenient to operate and increases the difficulty of the operation. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a snare, which enhances the bending performance of the snare under the extreme bending state of the distal end of the endoscope, and improves the convenience and operability of the operation.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A snare comprises a ferrule, a cable, an outer sheath and an operating handle, wherein a sliding portion is arranged on the operating handle; an extension portion formed by extending the ferrule wire is arranged at the proximal end of the ferrule; the cable comprises a first cable and a second cable which are passed through the outer sheath, the distal end of the first cable is fixedly connected to the extension portion of the ferrule via a first butt joint tube, the proximal end of the first cable is fixedly connected to the distal end of the second cable via a second butt joint tube, and the proximal end of the second cable is fixedly connected to the sliding portion; wherein the outer diameter of the first cable is smaller than the outer diameter of the second cable, and the outer diameter of the first butt joint tube is smaller than the outer diameter of the second butt joint tube; the lengths of the extension portion, the first butt joint tube and the second butt joint tube are 5 to 10 mm respectively.

[0006] Preferably, the extension portion is formed by two parallel loop wires, and when the loop is freely opened, the two loop wires of the extension portion are parallel and not stretched.

[0007] Preferably, the proximal ends of the two ferrule wires of the extension portion are inserted into the first butt joint tube and crimped and fixed.

[0008] Preferably, the length of the extension portion is 6 to 8 mm.

[0009] Preferably, the length of the first cable is 100-200 mm, and the outer diameter of the first cable is two-fifths to four-fifths of the outer diameter of the second cable.

[0010] Preferably, the length of the first pair of pipes is 5 to 7 mm, and the outer diameter of the first pair of pipes is two-fifths to four-fifths of the outer diameter of the second pair of pipes.

[0011] Preferably, the ferrule is a circular, half-moon, polygonal or elliptical ferrule, and the ferrule wire of the ferrule is made of a single-strand metal wire or multiple-strand metal wire.

[0012] Preferably, the first butt joint pipe is fixed to the extension portion by crimping, the first butt joint pipe is fixed to the first cable by welding, and the second butt joint pipe is fixed to the first cable and the second cable by welding.

[0013] Preferably, an electrode is provided on the sliding part, the proximal end of the second cable is fixedly connected to the sliding part through a metal connecting tube, and the ring is electrically connected to an external power source through the first butt joint tube, the first cable, the second butt joint tube, the second cable, the metal connecting tube and the electrode.

[0014] Preferably, the inner diameter of the outer sheath tube is 1.55 mm, the length of the first cable is 150 mm, the outer diameter of the first cable is 0.6 mm, the length of the first butt tube is 6 mm, the outer diameter of the first butt tube is 0.9 mm, and the length of the extension portion is 7.5 mm.

[0015] The utility model adopts the above technical solution, which enhances the bending performance of the snare in the extreme bending state of the distal end of the endoscope, and improves the convenience and operability of the operation. In this way, when the snare is used to remove polyps in special parts such as the fundus of the stomach, when the distal end of the endoscope is turned to the extreme state, the snare can still freely expand and contract in the outer sheath; and the rotation flexibility of the snare is increased, which is more convenient for the doctor's operation and more convenient for removing polyps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 Enlarged view of point I in the middle.

[0018] Figure numerals: 1, ferrule; 11, extension portion; 2, first butt joint tube; 3, first pull cable; 4, second butt joint tube; 5, second pull cable; 6, outer sheath; 7, electrode; 8, sliding portion; 9, operating handle; 91, thumb ring. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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. Example

[0024] like Figure 1 and Figure 2 A snare as shown includes a loop 1, a cable, an outer sheath 6 and an operating handle 9, wherein a sliding portion 8 is provided on the operating handle 9, and an extension portion 11 formed by extending the loop wire is provided at the proximal end of the loop 1; the cable includes a first cable 3 and a second cable 5 which are inserted into the outer sheath 6, the distal end of the first cable 3 is fixedly connected to the extension portion 11 of the loop 1 through a first butt joint tube 2, the proximal end of the first cable 3 is fixedly connected to the distal end of the second cable 5 through a second butt joint tube 4, and the proximal end of the second cable 5 is fixedly connected to the sliding portion 8; wherein the outer diameter of the first cable 3 is smaller than the outer diameter of the second cable 5, and the outer diameter of the first butt joint tube 2 is smaller than the outer diameter of the second butt joint tube 4; the lengths of the extension portion 11, the first butt joint tube 2 and the second butt joint tube 4 are 5 to 10 mm, respectively.

[0025] In the prior art, the cable and the loop are fixed by welding through a butt joint, which causes the connection between the loop and the butt joint to be too thick and too long, and cannot pass through the large bending position of the endoscope. In the present invention, two cables and two butt joints of different thicknesses are provided, and the outer diameter of the first butt joint and the first cable passing through the extreme bending position of the distal end of the endoscope during the extension and retraction of the snare is reduced to increase the gap between them and the outer sheath to avoid blocking and jamming. At the same time, a ferrule extension is provided to increase the distance between the ferrule and the first butt joint, shorten the length of the first butt joint, and enhance the extreme bending performance of the ferrule and the first butt joint. In this way, when the snare is used to remove polyps in special parts such as the fundus of the stomach, when the front section of the endoscope is turned to the extreme state, the ferrule can still freely extend and retract in the outer sheath; and the rotation flexibility of the snare is increased, which is more convenient for the doctor's operation and more convenient for removing polyps.

[0026] In this embodiment, the extension part 11 is formed by two parallel ferrule wires. When the ferrule 1 is freely opened, the two ferrule wires of the extension part 11 are parallel and not stretched. This is not only convenient for passing through the extreme bending, but also convenient for adjusting the posture of the ferrule, and the rotation adjustment of the ferrule is more flexible and convenient.

[0027] In this embodiment, the proximal ends of the two ferrule wires of the extension portion 11 are inserted into the first butt joint tube 2 and crimped and fixed. The ferrule 1 is a circular, half-moon, polygonal or elliptical ferrule, and the ferrule wire of the ferrule 1 is made of a single-strand metal wire or a multi-strand metal wire. The first butt joint tube 2 is crimped and fixed to the extension portion 11, the first butt joint tube 2 is welded and fixed to the first cable 3, and the second butt joint tube 4 is welded and fixed to the first cable 3 and the second cable 5. The sliding portion 8 is provided with an electrode 7, and the proximal end of the second cable 5 is fixedly connected to the sliding portion 8 through a metal connecting tube, and the ferrule 1 is electrically connected to an external power source through the first butt joint tube 2, the first cable 3, the second butt joint tube 4, the second cable 5, the metal connecting tube and the electrode 7.

[0028] In this embodiment, the length of the extension portion 11 is preferably 6 to 8 mm; the length of the first cable 3 is 100 to 200 mm, and the outer diameter of the first cable 3 is two-fifths to four-fifths of the outer diameter of the second cable 5; the length of the first butt joint 2 is 5 to 7 mm, and the outer diameter of the first butt joint 2 is two-fifths to four-fifths of the outer diameter of the second butt joint 4. In this way, when snares of various specifications pass through the extreme turning angle of the endoscope freely and reliably, the snare can still be freely extended and retracted in the outer sheath to perform surgery.

[0029] like Figure 2 As shown, the most preferred embodiment is: the inner diameter of the outer sheath tube 6 is 1.55 mm, the length b of the first cable 3 is 150 mm, the outer diameter of the first cable 3 is 0.6 mm, the length c of the first butt joint tube 2 is 6 mm, the outer diameter of the first butt joint tube 2 is 0.9 mm, the length a of the extension 11 is 7.5 mm, and the length d of the second butt joint tube 4 is 8 mm. In this way, by docking a thinner first cable 150 mm near the end of the loop and reducing and shortening the outer diameter of the first butt joint tube; at the same time, the length of the loop is increased, and the tail is increased by 7.5 mm, so that the snare reaches the bending performance under the extreme state of the endoscope, and the convenience and operability of the operation are improved.

[0030] 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.

[0031] 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 snare, comprising a ferrule (1), a cable, an outer sheath (6) and an operating handle (9), wherein the operating handle (9) is provided with a sliding portion (8), characterized in that: The proximal end of the ferrule (1) is provided with an extension portion (11) formed by extending the ferrule wire; The cable comprises a first cable (3) and a second cable (5) which are inserted into an outer sheath tube (6); the distal end of the first cable (3) is fixedly connected to an extension portion (11) of the ferrule (1) via a first butt joint tube (2); the proximal end of the first cable (3) is fixedly connected to a distal end of the second cable (5) via a second butt joint tube (4); and the proximal end of the second cable (5) is fixedly connected to the sliding portion (8); The outer diameter of the first cable (3) is smaller than the outer diameter of the second cable (5), and the outer diameter of the first butt joint (2) is smaller than the outer diameter of the second butt joint (4); the lengths of the extension portion (11), the first butt joint (2) and the second butt joint (4) are respectively 5 to 10 millimeters.

2. A snare according to claim 1, characterized in that: The extension portion (11) is formed by two parallel ferrule wires. When the ferrule (1) is freely opened, the two ferrule wires of the extension portion (11) are parallel and not opened.

3. A snare according to claim 2, characterized in that: The proximal ends of the two ferrule wires of the extension portion (11) are inserted into the first butt joint tube (2) and crimped and fixed.

4. A snare according to claim 3, characterized in that: The length of the extension portion (11) is 6 to 8 mm.

5. A snare according to claim 1, characterized in that: The length of the first cable (3) is 100 to 200 millimeters, and the outer diameter of the first cable (3) is two-fifths to four-fifths of the outer diameter of the second cable (5).

6. A snare according to claim 1, characterized in that: The length of the first butt joint (2) is 5 to 7 millimeters, and the outer diameter of the first butt joint (2) is two-fifths to four-fifths of the outer diameter of the second butt joint (4).

7. A snare according to claim 1, characterized in that: The ferrule (1) is a circular, half-moon, polygonal or elliptical ferrule, and the ferrule wire of the ferrule (1) is made of a single-strand metal wire or multiple-strand metal wire.

8. The snare according to claim 1, characterized in that: The first butt-jointed tube (2) is fixed to the extension portion (11) by crimping, the first butt-jointed tube (2) is fixed to the first cable (3) by welding, and the second butt-jointed tube (4) is fixed to the first cable (3) and the second cable (5) by welding.

9. The snare according to claim 1, characterized in that: The sliding part (8) is provided with an electrode (7), the proximal end of the second cable (5) is fixedly connected to the sliding part (8) via a metal connecting tube, and the ferrule (1) is electrically connected to an external power source via a first butt joint tube (2), a first cable (3), a second butt joint tube (4), a second cable (5), a metal connecting tube and the electrode (7).

10. The snare according to claim 1, characterized in that: The inner diameter of the outer sheath tube (6) is 1.55 mm, the length of the first cable (3) is 150 mm, the outer diameter of the first cable (3) is 0.6 mm, the length of the first butt joint tube (2) is 6 mm, the outer diameter of the first butt joint tube (2) is 0.9 mm, and the length of the extension portion (11) is 7.5 mm.

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