Cold and hot double-cutting snare

Abstract

The utility model discloses a cold and hot double-cutting snare which comprises a snare, an outer tube, an inhaul cable, a handle and a sliding seat. The near end of the outer tube is connected with the handle, the ring sleeve is arranged at the far end of the outer tube, the inhaul cable is arranged in the outer tube and the handle, the far end of the inhaul cable is fixedly connected with the ring sleeve through a butt joint tube, and the near end of the inhaul cable is fixedly connected with a sliding seat installed on the handle in a sliding mode; the inner pipe is arranged on the inhaul cable in a sleeving manner; wherein the outer pipe is made of a PE material, and the inner pipe is made of a PTFE material. According to the arrangement, the outer side of the inhaul cable is protected by adopting two pipes made of different materials, the PTFE material with the better insulating property is located on the inner side, and the PE material with the better mechanical property is located on the outer side, so that the insulating property of the snare is met, the pipes are prevented from being broken down by high voltage in the electric resection or electrocoagulation process, and the service life of the snare is prolonged. Meanwhile, the requirement of the cold cutting action on the mechanical property of the cold snare is met; instruments used in the operation process can be reduced, the operation time is shortened, and therefore the operation risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a cold and hot double-cutting snare device. Background Technology

[0002] Currently, most electrocautery snares on the market are made of PTFE tubing. PTFE tubing has excellent insulation properties, preventing the tubing from being punctured by high voltage during electrocautery or electrocoagulation. However, many hospitals now try to avoid electrocautery for polyps that can be cold-cut.

[0003] The prior art disclosed in CN203776982U is a snare device that integrates heating and cooling, including a snare, a cable connecting the snare, a wristband connecting the cable, the wristband being fixed to a core rod, a limiting block being provided at one end of the wristband near the snare, a positioning cap being provided at the front end of the core rod, and a conductive plug for electrically connecting the cable being provided on the positioning cap. The snare is woven from sharp metal wire, and a color layer for measuring the size of polyps is coated on the metal wire. An outer sheath is provided outside the cable.

[0004] In the existing technology, due to the poor mechanical properties of the PTFE outer sheath, the outer sheath is prone to wrinkling at the end due to excessive stretching of the cable during cold cutting. In order to avoid excessive stretching or wrinkling of the outer sheath during the use of the snare, doctors need to use a variety of instruments to assist in the operation. Utility Model Content

[0005] In order to solve the problems of the prior art, the purpose of this utility model is to provide a hot and cold dual-cutting snare that can prevent the pipe from being broken down by high pressure during the electric cutting or electrocoagulation process, and also meet the mechanical performance requirements of the snare during cold cutting, thus satisfying both electric cutting and cold cutting needs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hot and cold double-cutting snare, comprising a snare, an outer tube, a pull cable, a handle, and a sliding seat; the proximal end of the outer tube is connected to the handle, the snare is disposed at the distal end of the outer tube, the pull cable is disposed inside the outer tube and the handle, the distal end of the pull cable is fixedly connected to the snare through a connecting tube, and the proximal end of the pull cable is fixedly connected to the sliding seat slidably mounted on the handle; it also includes an inner tube, which is sleeved on the pull cable; wherein, the outer tube is made of PE material, and the inner tube is made of PTFE material.

[0007] Preferably, the wall thickness of the outer tube is greater than that of the inner tube.

[0008] Preferably, the inner tube and the outer tube are fitted with a clearance, and the clearance between the outer tube and the inner tube is greater than the clearance between the inner tube and the zipper.

[0009] Preferably, the outer diameter of the connecting pipe is larger than the inner diameter of the inner pipe, allowing the cable and the inner pipe to move relative to each other, and the connecting pipe to move into the outer pipe and abut against the far end of the inner pipe.

[0010] Preferably, the inner tube is fixedly connected to the cable.

[0011] Preferably, the inner hole of the outer tube is a through hole with a consistent inner diameter.

[0012] Preferably, the distal end of the inner tube is located inside the outer tube.

[0013] As a preferred option, the outer wall of the handle is provided with a scale.

[0014] Preferably, an electrode holder is provided on the sliding seat, and the electrode holder is electrically connected to the cable.

[0015] Preferably, the proximal end of the outer tube is covered with a sheath, and the outer tube is connected to the handle by a nut.

[0016] The beneficial effects of the technical solution of this utility model are as follows: the outer side of the cable is protected by two different materials, with PTFE material with better insulation performance on the inner side and PE material with better mechanical properties on the outer side. This satisfies the insulation performance of the snare and prevents the tube from being broken down by high voltage during electrocautery or electrocoagulation. It also meets the mechanical performance requirements of the cold snare for the cold cutting action. It can reduce the number of instruments used in the operation, shorten the operation time, and thus reduce the surgical risk. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a hot and cold dual-cutting ring device;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0019] Reference numerals: 1. Sleeve; 2. Outer tube; 3. Cable; 4. Connecting tube; 5. Handle; 6. Nut; 7. Sliding seat; 8. Electrode seat; 9. Sheath tube; 10. Inner tube. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the following embodiments, the location of the ring is considered the distal end, and the handle for handheld use is considered the proximal end. Example

[0026] like Figure 1 and Figure 2The hot and cold double-cut snare shown includes a snare 1, an outer tube 2, a pull cable 3, a handle 5, and a sliding seat 7. The proximal end of the outer tube 2 is connected to the handle 5, the snare 1 is located at the distal end of the outer tube 2, the pull cable 3 is located inside the outer tube 2 and the handle 5, the distal end of the pull cable 3 is fixedly connected to the snare 1 through a connecting pipe 4, and the proximal end of the pull cable 3 is fixedly connected to the sliding seat 7 slidably mounted on the handle 5. It also includes an inner tube 10, which is sleeved on the pull cable 3 and located between the connecting pipe 4 and the sliding seat 7. The outer tube 2 is made of PE material, and the inner tube 10 is made of PTFE material. The wall thickness of the outer tube 2 is greater than the wall thickness of the inner tube 10, the gap between the outer tube 2 and the inner tube 10 is greater than the gap between the inner tube 10 and the pull cable 3, and the outer diameter of the connecting pipe 4 is smaller than the outer diameter of the inner tube 10.

[0027] With this design, the outer side of the cable is protected by two different materials: PTFE, which has better insulation properties, is located on the inner side, and PE, which has better mechanical properties, is located on the outer side. This satisfies the insulation performance of the snare, preventing the tube from being punctured by high voltage during electrocautery or electrocoagulation, while also meeting the mechanical performance requirements of the cold snare for the cold cutting action. This reduces the number of instruments used during the operation, shortens the operation time, and thus reduces the surgical risk.

[0028] In this embodiment, the outer diameter of the connecting tube 4 is larger than the inner diameter of the inner tube 10, allowing the cable 3 and the inner tube 10 to move relative to each other. The connecting tube 3 can move into the outer tube 2 and abut against the distal end of the inner tube 10. This arrangement facilitates instrument manufacturing, ensures the effectiveness of the snare, and confines the inner tube to the cable.

[0029] In this embodiment, the distal end of the inner tube 10 is located inside the outer tube.

[0030] In this embodiment, the cable 3 and the loop 1 are fixedly connected by the connecting pipe 4, which can extend into the outer tube 2 and abut against the end of the inner tube 10.

[0031] In this embodiment, the outer wall of the handle 5 is provided with a scale. This design makes it easier for the user to control the movement distance of the cable 3.

[0032] In this embodiment, an electrode seat 8 is provided on the sliding seat 7, and the electrode seat 8 is electrically connected to the cable 3.

[0033] In this embodiment, finger holes are provided near the sliding seat 7 and the handle 5.

[0034] In this embodiment, the outer tube 2 is covered with a protective sleeve 9 at the end facing the handle 5, and the protective sleeve 9 is installed on the handle by a nut 6. Example

[0035] Unlike Example 1, the inner tube is fixed to the cable by means of thermoplasticizing, applying adhesive, or heat fitting. Everything else is the same as in Example 1.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A cold and hot double cutting snare, comprising a snare (1), an outer tube (2), a pull cable (3), a handle (5) and a sliding seat (7); the proximal end of the outer tube (2) is connected with the handle (5), the snare (1) is arranged at the distal end of the outer tube (2), the pull cable (3) is arranged in the outer tube (2) and the handle (5), the distal end of the pull cable (3) is fixedly connected with the snare (1) through a butt joint tube (4), and the proximal end of the pull cable (3) is fixedly connected with the sliding seat (7) which is slidingly installed on the handle (5); characterized in that: The utility model also comprises an inner tube (10), the inner tube (10) is sleeved on the cable (3), and the inner tube (10) is located between the butt joint pipe (4) and the sliding seat (7); wherein the material of the outer tube (2) is PE material, and the material of the inner tube (10) is PTFE material. ​ 2. The cold-hot double snare according to claim 1, characterized in that: The wall thickness of the outer tube (2) is greater than the wall thickness of the inner tube (10).

3. The cold-hot double snare according to claim 1, characterized in that: The inner tube (10) is in clearance fit with the outer tube (2), and the clearance between the outer tube (2) and the inner tube (10) is greater than the clearance between the inner tube (10) and the cable (3).

4. The cold-hot double snare according to claim 3, characterized in that: The outer diameter of the butt joint pipe (4) is greater than the inner diameter of the inner tube (10), the cable (3) and the inner tube (10) can relatively move, and the butt joint pipe (4) can move into the outer tube (2) and abut against the distal end of the inner tube (10).

5. The cold-hot double snare according to claim 1, characterized in that: The inner tube (10) is fixedly connected with the cable (3).

6. The cold-hot double snare according to claim 1, characterized in that: The inner hole of the outer tube (2) is a through hole with consistent inner diameter.

7. The cold-hot double snare according to claim 1, characterized in that: The distal end of the inner tube (10) is located in the outer tube (2).

8. The cold and hot double snare according to claim 1, characterized in that: The outer wall of the handle (5) is provided with a scale.

9. The cold and hot double snare according to claim 1, characterized in that: The sliding seat (7) is provided with an electrode seat (8), and the electrode seat (8) is electrically connected with the cable (3).

10. The cold-hot double snare according to claim 1, characterized in that: The proximal end of the outer tube (2) is covered with a sheath pipe (9), and the outer tube (2) is connected with the handle (5) through a screw cap (6).

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