Cold snare

Abstract

The utility model relates to the technical field of medical instruments, in particular to a cold snare which comprises a handle body and a first flexible sheath with the near end connected to the handle body. An operating wire is arranged in the first flexible sheath in a penetrating manner, the far end of the operating wire is connected with a loop ring located at the far end of the first flexible sheath, the near end of the operating wire is connected to a first operating part on the handle main body, and the first operating part is matched with the first flexible sheath through the operating wire to control the loop ring to retract and release; the outer side of the first flexible sheath is further sleeved with a second flexible sheath, a cutter is arranged at the far end of the second flexible sheath, and the near end of the second flexible sheath is connected to a second operation part on the handle body. The second operation part is used for driving the second flexible sheath to move along the first flexible sheath, so that the cutter on the far end part can be close to or far away from the snare ring. According to the scheme, the cutter can move to cut tissue, the active cutter is adopted, and the cutting effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a cold snare. Background Art

[0002] A snare is a digestive endoscopy accessory primarily used to remove gastrointestinal polyps, including raised and flat lesions, and even early gastrointestinal cancers. It is categorized into two main types: hot snares and cold snares. Hot snares remove polyps through electrocoagulation, while cold snares rely on mechanical tightening to achieve removal.

[0003] The components of the snare mainly include an operating handle, a snare ring and an outer sheath. The snare ring is the core component that realizes the tightening and cutting functions, and is usually made of a steel wire material with good tension. The outer sheath plays an auxiliary role, which is especially important in the use of the cold snare. The snare has various shapes and can be selected according to different clinical needs, such as round, oval, semicircular, etc. However, when the tissue to be cut by the snare is relatively large, the existing cold snare has the problem of not being able to cut it. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a cold snare. The cutter in this solution is movable to cut tissue, and an active cutter is used, which has a better cutting effect.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A cold snare comprises a handle body and a first flexible sheath whose proximal end is connected to the handle body; an operating wire is passed through the first flexible sheath, the distal end of the operating wire is connected to a snare ring located at the distal end of the first flexible sheath, the proximal end of the operating wire is connected to a first operating part on the handle body, the first operating part controls the retraction and extension of the snare ring through the operating wire and in cooperation with the first flexible sheath; a second flexible sheath is further sheathed on the outside of the first flexible sheath, a cutter is provided on the distal end of the second flexible sheath, and the proximal end of the second flexible sheath is connected to a second operating part on the handle body; the second operating part is used to drive the second flexible sheath to move along the first flexible sheath so that the cutter on the distal end can approach or move away from the snare ring.

[0007] The utility model adopts the above-mentioned technical solution, which relates to a cold snare. An operating wire is provided in the first flexible sheath of the cold snare, and the distal end of the operating wire is connected to the snare ring located at the distal end of the first flexible sheath. When in use, the snare ring is controlled by the first operating part to make the snare ring cooperate with the first flexible sheath to be retracted and extended, thereby tightening and removing polyps.

[0008] On this basis, in order to avoid the situation where the cold snare is unable to cut continuously when the tissue to be cut is relatively large, the snare is used in a strangulation manner.

[0009] This solution also provides a cutter at the distal end of the cold snare to assist the snare ring in removing larger tissues. Specifically, a second flexible sheath is provided on the outside of the first flexible sheath in this solution, and the cutter is provided on the distal end of the second flexible sheath. During use, operating the second operating portion drives the second flexible sheath to move along the first flexible sheath, allowing the cutter on the distal end to move closer to or further away from the snare ring. In this way, the cutter in this solution can be moved to remove tissue. This solution uses an active cutter, which has the advantages of better excision effect and smoother cut surface.

[0010] Preferably, the cutter includes a blade provided on the distal end portion of the second flexible sheath and arranged continuously or discontinuously in a circumferential annular shape. The cutter may be a solution as given in the embodiment of this case.

[0011] Preferably, the handle body includes a main body portion, and the first operating portion and the second operating portion are both slidably disposed along the length of the main body portion. During operation, the first operating portion slides relative to the main body portion to control the operating wire and the snare ring, and the second operating portion slides relative to the main body portion to control the second flexible sheath and the cutting blade thereon.

[0012] In a specific embodiment, the first operating portion comprises a slider that slides longitudinally along the main body, with finger sleeves positioned on either side of the slider. The slider pulls an operating wire, which, in conjunction with the first flexible sheath, controls the retraction and extension of the snare loop. During use, the physician inserts their index and middle fingers into the finger sleeves of the first operating portion and their thumb into the finger sleeve of the main body. This single-handed operation allows for rapid advancement and retraction, as well as control of the snare loop's extension and retraction.

[0013] In one embodiment, the second operating part is slidingly frictionally arranged on the main body; thus, the second flexible sheath and the cutter thereon can be controlled to advance and retreat by only pushing and pulling the second operating part, and the positions of the second operating part, the second flexible sheath and the cutter are positioned based on the friction force to avoid random sliding.

[0014] In another embodiment, a limiting mechanism for sliding positioning is provided between the second operating portion and the main body, and the limiting mechanism can position the second operating portion, the second flexible sheath and the cutter to prevent them from sliding randomly.

[0015] In another embodiment, the second operating portion is provided with sliding friction on the main body; thus, the second flexible sheath and the cutter thereon can be controlled to advance and retreat by simply pushing or pulling the second operating portion, and the second operating portion, the second flexible sheath, and the cutter are positioned based on the friction force to prevent them from sliding freely. Furthermore, a limiting mechanism for sliding positioning can be provided between the second operating portion and the main body. The limiting mechanism can position the second operating portion, the second flexible sheath, and the cutter to prevent them from sliding freely.

[0016] In a specific solution, the limiting mechanism includes a rack and a gear. A rack is provided along the length direction on one of the main body and the second operating part, and a gear meshing with the rack is rotatably provided on the other. Based on the meshing of the gear and the rack, the second operating part is slidably positioned relative to the main body to avoid arbitrary sliding.

[0017] In the above solution, the second operating part is driven by pushing or pulling it relative to the first operating part. In a further embodiment, the gear is further provided with a gear lever. Rotating the gear lever drives the gear meshing with the rack, thereby driving the second operating part to slide relative to the main body. In this solution, rotating the gear lever further drives the second operating part to slide, thus enabling stable forward and backward movement and precise operation.

[0018] In a specific embodiment, the second operating part is constructed as a sleeve, and the main body is constructed as a rod body that passes through the inner cavity of the sleeve; the rack is arranged on the side wall of the rod body, and a mounting seat is provided on the sleeve; the gear rod is rotated and arranged on the mounting seat, and the gear at the inner end is engaged with the rack in the inner cavity of the sleeve.

[0019] In a specific embodiment, the second operating portion is constructed as a sleeve, the main body is constructed as a rod inserted into the sleeve, and the second flexible sheath is fixedly connected to the distal end of the sleeve.

[0020] In a specific embodiment, the second flexible sheath is a spring tube, and the outer side of the spring tube is covered with a thin-walled tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the three-dimensional structure of the cold snare.

[0022] Figure 2 for Figure 1 Magnified view of part A.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the cold snare when the cutter is in use.

[0024] Figure 4 for Figure 3 Enlarged view of part B.

[0025] Figure 5This is an exploded diagram of the cold snare structure.

[0026] Figure 6 Side view of the cold snare with the sleeve omitted.

[0027] Figure 7 It is a schematic diagram of the structural connection between the first main body and the second main body. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention, examples of which 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 explain the present invention, and should not be construed as limiting the present invention.

[0029] 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 to indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] like Figures 1 to 7 As shown, this embodiment relates to a cold snare, comprising a handle body 1, and a first flexible sheath 2 connected to the handle body 1 at its proximal end. An operating wire 3 is passed through the first flexible sheath 2, the distal end of the operating wire 3 is connected to a snare ring 4 located at the distal end of the first flexible sheath 2, and the proximal end of the operating wire 3 is connected to a first operating portion 11 on the handle body 1. The first operating portion 11 controls the retraction and extension of the snare ring 4 through the operating wire 3 and in cooperation with the first flexible sheath 2. An operating wire is provided in the first flexible sheath in the cold snare, the distal end of the operating wire is connected to the snare ring located at the distal end of the first flexible sheath. When in use, the snare ring is controlled by the first operating portion so that the snare ring is retracted and extended in cooperation with the first flexible sheath, thereby tightening and removing polyps.

[0034] like Figure 1 、 3 As shown in Figures 5 and 6 , the handle body 1 includes a main body 12, a finger sleeve 17 is provided at the end of the main body 12, and a first operating portion 11 is slidably provided along the length direction of the main body 12. In a specific embodiment, the first operating portion 11 is constructed as a slider slidably provided on the main body 12 along the length direction, and finger sleeves 17 are located on both sides of the slider. The slider is operated to pull the operating wire 3 and cooperate with the first flexible sheath 2 to control the retraction and extension of the snare ring 4. During use, the doctor inserts the index and middle fingers into the finger sleeve 17 of the first operating portion 11 and the thumb into the finger sleeve 17 of the main body 12. Single-handed operation can achieve rapid advance and retreat and control the retraction and extension of the snare ring.

[0035] like Figure 2 、 4 As shown in FIG5 , the outer side of the first flexible sheath 2 is also covered with a second flexible sheath 5. The second flexible sheath 5 is a spring tube. The outer side of the spring tube can be covered with a thin-walled tube. A cutter 6 is provided on the distal end of the second flexible sheath 5. The cutter 6 includes a circumferentially continuous blade provided on the distal end of the second flexible sheath 5. Figure 2 and 4 The annular blade solution shown can also be a solution using a circular annular blade; it can also be a solution using a blade with a circumferential annular discontinuous arrangement, such as a serrated annular blade.

[0036] The proximal end of the second flexible sheath 5 is connected to the second operating part 13 on the handle body 1. The second operating part 13 is used to drive the second flexible sheath 5 to move along the first flexible sheath 2, so that the cutter 6 on the distal end can move closer to or away from the snare ring 4. In order to avoid the situation where the cold snare adopts a strangulation method to cut when the tissue to be cut is relatively large. This solution also provides a cutter at the distal end of the cold snare to assist the snare ring in removing larger tissues. Specifically, the outer side of the first flexible sheath in this solution is also provided with a second flexible sheath, and the cutter is provided on the distal end of the second flexible sheath. When in use, operating the second operating part can drive the second flexible sheath to move along the first flexible sheath, so that the cutter on the distal end can move closer to or away from the snare ring. In this way, the cutter in this solution can move to cut tissue. This solution adopts an active cutter, which has a better cutting effect.

[0037] In a specific embodiment, the first operating portion 11 and the second operating portion 13 are slidably arranged along the length of the main body 12. During operation, the first operating portion 11 slides relative to the main body 12 to control the operating wire 3 and the snare ring 4, and the second operating portion 13 slides relative to the main body 12 to control the second flexible sheath 5 and the cutter 6 thereon.

[0038] In one embodiment, the second operating portion 13 is frictionally mounted on the main body 12. Thus, the second flexible sheath 5 and the cutter 6 thereon can be controlled to advance and retreat by simply pushing or pulling the second operating portion 13. The second operating portion 13, the second flexible sheath 5, and the cutter 6 are positioned based on friction, preventing the second operating portion 13 from sliding freely relative to the main body 12.

[0039] exist Figure 1 、 3 In another embodiment shown in Figures 5 and 6 , the second operating portion 13 is provided on the main body 12 by sliding friction, and a limiting mechanism for sliding positioning is provided between the second operating portion 13 and the main body 12. The limiting mechanism can position the second operating portion 13, the second flexible sheath 5 and the cutter 6 to prevent them from sliding at will. In this way, pushing and pulling the second operating portion 13 can control the advance and retreat of the second flexible sheath 5 and the cutter 6 thereon, and based on the friction force, the positions of the second operating portion 13, the second flexible sheath 5 and the cutter 6 are positioned to prevent the second operating portion 13 from sliding at will relative to the main body 12, thereby preventing the second operating portion 13 from sliding at will relative to the first operating portion 11. At the same time, a limiting mechanism for sliding positioning is provided between the second operating portion 13 and the main body 12, further preventing the second operating portion 13 from sliding at will relative to the main body 12.

[0040] exist Figure 1 、 3In another embodiment shown in Figures 5 and 6, a limiting mechanism for sliding positioning is provided between the second operating portion 13 and the main body 12. The limiting mechanism can position the second operating portion 13, the second flexible sheath 5, and the cutter 6, preventing the second operating portion 13 from sliding freely relative to the main body 12. In a specific embodiment, the limiting mechanism includes a rack 14 and a gear 18. One of the main body 12 and the second operating portion 13 is provided with a rack 14 arranged along the length direction, and the other is provided with a gear 18 that is rotatably engaged with the rack 14. Based on the engagement of the gear 18 with the rack 14, the second operating portion 13 is slidably positioned relative to the main body 12, preventing the second operating portion 13 from sliding freely relative to the main body 12.

[0041] The above solution uses direct push-pull motion for the second operating portion 13. In a further embodiment, a gear lever 15 is further provided on the gear 18. Rotating the gear lever 15 drives the gear meshing with the rack 14, thereby driving the second operating portion 13 to slide relative to the main body 12. This solution can also rotate the gear lever 15 to further drive the second operating portion 13 to slide, thus ensuring stable forward and backward movement and precise operation.

[0042] like Figure 5 In the illustrated embodiment, the second operating portion 13 is constructed as a sleeve, and the main body 12 is constructed as a rod 121 that extends through the sleeve's inner cavity 131. The second flexible sheath 5 is affixed to the sleeve's distal end, while the first flexible sheath 2 extends through the sleeve's distal end and affixes to the inner portion 12. A rack 14 is mounted on the sidewall of the rod 121, and a mounting seat 16 is provided on the sleeve. A gear lever 15 rotates on the mounting seat 16, and a gear 18 at its inner end engages with the rack 14 in the sleeve's inner cavity 131.

[0043] The cross-sectional shape of the sleeve inner cavity 131 is non-circular. On the one hand, it facilitates installation and helps to determine the relative position of the main body 12 and the second operating part 13. On the other hand, it prevents the second operating part 13 of the rack 14 from rotating circumferentially relative to the main body 12 and prevents the rack 14 from disengaging from the gear 18, thereby ensuring that the limiting mechanism can effectively limit the second operating part 13 relative to the main body 12.

[0044] The cold snare can be used in conjunction with an endoscope. The insertion portion of the endoscope can be considered a protective shell for the cutter 6 in this embodiment, thereby preventing the cutter 6 from causing damage to the human body during insertion. During use, the cold snare is passed through the insertion portion of the endoscope until the snare ring 4 of the cold snare reaches the polyp. The handle is then used to adjust the snare ring 4 to be directly above the polyp, which is then pulled downward to encircle the base of the polyp. The slider is then operated to gradually tighten the snare ring 4 around the polyp. The snare ring is then pulled back, shrinking the snare ring to achieve incision. When it is necessary to cooperate with the cutter 6 for excision, the gear lever 15 can be further operated to drive the second flexible sheath 5 and the cutter 6 thereon toward the polyp until the polyp is removed.

[0045] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0046] 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 this 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 cold snare, comprising a handle body (1), and a first flexible sheath (2) connected to the handle body (1) at its proximal end; an operating wire (3) is passed through the first flexible sheath (2), the distal end of the operating wire (3) is connected to a snare ring (4) located at the distal end of the first flexible sheath (2), the proximal end of the operating wire (3) is connected to a first operating portion (11) on the handle body (1), the first operating portion (11) controls the retraction and extension of the snare ring (4) through the operating wire (3) and in cooperation with the first flexible sheath (2); characterized in that: A second flexible sheath (5) is also provided on the outer side of the first flexible sheath (2), a cutter (6) is provided on the distal end of the second flexible sheath (5), and the proximal end of the second flexible sheath (5) is connected to a second operating portion (13) on the handle body (1); the second operating portion (13) is used to drive the second flexible sheath (5) to move along the first flexible sheath (2), so that the cutter (6) on the distal end can approach or move away from the snare ring (4).

2. A cold snare according to claim 1, characterized in that: The cutter (6) comprises a blade which is provided on the distal end portion of the second flexible sheath (5) and is arranged continuously or discontinuously in a circumferential annular shape.

3. A cold snare according to claim 1, characterized in that: The handle body (1) comprises a main body portion (12), and the first operating portion (11) and the second operating portion (13) are both slidably arranged along the length direction of the main body portion (12).

4. A cold snare according to claim 3, characterized in that: The first operating portion (11) is constructed as a slider slidably arranged on the main body (12) along the length direction, and finger sleeves (17) located on both sides of the slider; the slider is operated to pull the operating wire (3) to cooperate with the first flexible sheath (2) to control the retraction and extension of the snare ring (4).

5. A cold snare according to claim 3, characterized in that: The second operating part (13) is slidingly frictionally arranged on the main body (12), and / or a limiting mechanism for sliding positioning is arranged between the second operating part (13) and the main body (12).

6. A cold snare according to claim 5, characterized in that: The limiting mechanism comprises a rack (14) and a gear (18); one of the main body (12) and the second operating part (13) is provided with a rack (14) arranged along the length direction, and the other is rotatably provided with a gear (18) meshing with the rack (14); based on the meshing of the gear (18) and the rack (14), the second operating part (13) is slidably positioned relative to the main body (12).

7. A cold snare according to claim 6, characterized in that: The gear (18) is also provided with a gear rotating rod (15). The gear rotating rod (15) is rotated to drive the gear (18) meshed with the rack (14) to rotate, thereby driving the second operating part (13) to slide relative to the main body (12).

8. A cold snare according to claim 7, characterized in that: The second operating portion (13) is constructed as a sleeve, and the main body (12) is constructed as a rod body (121) that is inserted into the inner cavity (131) of the sleeve; the rack (14) is arranged on the side wall of the rod body (121), and a mounting seat (16) is provided on the sleeve; the gear rod (15) is rotated and arranged on the mounting seat (16), and the gear (18) at the inner end is engaged with the rack (14) in the inner cavity (131) of the sleeve.

9. The cold snare according to claim 5, characterized in that: The second operating portion (13) is constructed as a sleeve, and the main body (12) is constructed as a rod (121) passing through the interior of the sleeve; the second flexible sheath (5) is fixedly connected to the distal end of the sleeve.

10. The cold snare according to claim 1, characterized in that: The second flexible sheath (5) is a spring tube, and the outer side of the spring tube is covered with a thin-walled tube.

Images