Bendable snare device
By introducing a traction wire and a limiting structure into the snare device, the snare head and outer tube can be bent, solving the problem of the snare being unable to fit the root of the polyp, achieving complete resection of the lesion, and improving surgical efficiency and the service life of the snare head.
Patent Information
- Application Number
- CN202422660850.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The existing snare head cannot be bent, which makes it impossible to fit closely to the root of the polyp and completely remove the lesion in one go.
A flexible snare device is designed. By adding traction wires to the snare handle and the pulling handle, the traction wires are used to control the bending of the snare head, and the movement of the traction wires is restricted by a limiting structure. A cut is provided on the outer tube to facilitate bending, thereby achieving flexible deformation of the snare head and the outer tube.
The loop head and outer tube can better fit the root of the polyp, achieving complete resection of the lesion, improving the efficiency of the operation and the service life of the loop head.
Smart Images
Figure CN223392507U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a flexible snare device. Background Art
[0002] Endoscopic mucosal resection (EMR) involves injecting medication into the submucosal layer of lesions (such as sessile polyps, flat or shallowly depressed polyps, leiomyomas, and early-stage esophageal, gastric, and colon cancers) to create a fluid cushion, followed by removal of large sections of mucosal tissue. Its advantage is that lesions can be removed endoscopically without requiring surgical intervention.
[0003] A snare is a commonly used surgical instrument in EMR procedures, used in conjunction with an endoscope. It uses high-frequency electric current to remove polyps or excess tissue within the digestive tract. Polyps are classified by location as esophageal, gastric, small intestinal, and large intestinal (colon and rectum) polyps, with gastric and large intestinal polyps being the most common. Polyps are categorized as pedunculated, subpedunculated (sessile), and flat, depending on whether they are pedunculated or not. When dealing with large intestinal polyps, the snare's inflexible head prevents it from fitting snugly around the base of the polyp. This prevents the snare from effectively entrapping sessile or subpedunculated polyps, preventing complete capture and removal of the lesion. Utility Model Content
[0004] In order to solve the technical problem in the prior art that the snare head cannot be bent, resulting in the inability to closely fit the polyp root and the inability to completely remove the lesion in one go, the present utility model provides a flexible snare device to solve the above problem.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a flexible snare device, including a snare handle, a pulling handle, a snare assembly and an outer tube, the snare assembly including a snare head, a traction wire and a pull rope, the snare handle and the traction handle are both connected to the outer tube, the snare handle has a snare slip ring capable of reciprocating movement and an electrode seat located on the snare slip ring, the traction handle has a traction slip ring capable of reciprocating movement, one end of the pull rope is connected to the end of the snare head, and the other end of the pull rope passes through the outer tube and is connected to the snare slip ring; one end of the traction wire is connected to the snare assembly or the outer tube, and the other end passes through the outer tube and is connected to the traction slip ring, and the traction slip ring drives the snare head to bend to one side by pulling the traction wire.
[0006] Furthermore, the traction wire is connected to the middle part of the loop head, and the traction wire and the loop head are connected through at least two connection points located on both sides of the symmetry axis of the loop head, and each traction wire is located on the same side of the loop head.
[0007] Furthermore, two traction wires are symmetrically arranged, and each traction wire forms a connection point with the loop head.
[0008] Furthermore, a sliding tube is provided on the loop head, and the connection point between the traction wire and the loop head is located on the sliding tube. The loop head also has a limiting structure for inhibiting the traction wire from moving toward the end of the loop head.
[0009] Furthermore, the limiting structure is a limiting tube fixed to the ring head.
[0010] Furthermore, the ring head is a variable cross-section structure, and the limiting structure is a thickened section of the ring head.
[0011] Furthermore, the outer circumference of the outer tube is provided with a first incision connected to the interior of the outer tube. After the traction wire extends out of the first incision, it extends to one end of the outer tube connecting loop and is fixed to the outer tube, so that the outer tube part between the first incision and the loop can be bent.
[0012] Furthermore, the outer tube has a first cavity and a second cavity extending coaxially, the pull cable is located in the first cavity, the traction wire is located in the second cavity, and the incision is connected to the second cavity.
[0013] Furthermore, one end of the outer tube connecting ring head is cut with a second incision connected to the second cavity, and the traction wire is fixed at the second incision by pulling the fixing tube.
[0014] Furthermore, the snare handle includes a snare core rod and a snare nut, the pulling handle includes a pulling core rod and a pulling nut, the snare handle, the pulling handle and the outer tube are connected through a tee, the snare slip ring is slidably set on the snare core rod, the pulling slip ring is slidably set on the pulling core rod, the snare core rod and the tee are connected through the snare nut, and the pulling core rod and the tee are connected through the pulling nut.
[0015] The beneficial effects of the utility model are:
[0016] (1) The present invention adds a pulling handle to the snare handle, and uses a pulling wire to control the bending of the snare head, so that the snare head fits more closely to the root of the polyp, facilitating the complete removal of the lesion.
[0017] (2) The utility model connects the traction wire to the loop head, directly pulls the loop head to bend, and uses a limiting tube to limit the movement of the traction wire.
[0018] (3) The utility model provides a first incision on the outer tube, and extends one end of the traction wire out of the outer tube and connects to the outside of the outer tube. When the traction wire is pulled, the traction wire can pull the end of the outer tube from the outside, causing the outer tube to bend, thereby driving the loop head to tilt. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] Figure 1This is a front view of the first embodiment of the flexible snare device of the present invention;
[0021] Figure 2 yes Figure 1 an axial cross-sectional view of the flexible snare device shown;
[0022] Figure 3 yes Figure 1 Enlarged view of point a in the middle;
[0023] Figure 4 yes Figure 1 A three-dimensional view of the middle trap assembly in a flat-lay state;
[0024] Figure 5 yes Figure 1 A front view of the snare assembly in a bent state;
[0025] Figure 6 is a three-dimensional diagram of the snare assembly in 1 when it is in a bent state;
[0026] Figure 7 This is a front view of a second embodiment of the flexible snare device of the present invention;
[0027] Figure 8 yes Figure 7 Enlarged view of point b in the middle;
[0028] Figure 9 This is a schematic diagram of the connection of the traction wire at the tee pipe in the utility model;
[0029] Figure 10 yes Figure 7 A schematic end view of the outer tube of the flexible snare device shown;
[0030] Figure 11 yes Figure 7 A three-dimensional view of the middle trap assembly in a flat-lay state;
[0031] Figure 12 yes Figure 7 A three-dimensional diagram of the snare assembly in a bent state;
[0032] Figure 13 yes Figure 7 Front view of the snare assembly in a bent state.
[0033] In the figure, 1. snare handle, 101. snare slip ring, 102. snare core rod, 103. snare nut, 104. electrode holder, 2. pulling handle, 201. pulling slip ring, 202. pulling core rod, 203. pulling nut, 3. snare assembly, 301. snare head, 302. traction wire, 303. pull rope, 304. sliding tube, 305. limiting tube, 4. outer tube, 401. third incision, 402. first incision, 403. bending section, 404. first cavity, 405. second cavity, 406. second incision, 5. butt joint tube, 6. sheath tube, 7. tee tube, 8. connection point, 9. pulling fixing tube, 10. electrode plug. DETAILED DESCRIPTION
[0034] The following describes embodiments of the present invention in detail. 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 only to explain the present invention and are not to be construed as limiting the present invention.
[0035] like Figure 1-Figure 3 As shown, a flexible snare device includes a snare handle 1, a pulling handle 2, a snare assembly 3 and an outer tube 4. One end of the outer tube 4 is connected to the snare assembly 3, and the other end is connected to the snare handle 1 and the pulling handle 2. The snare assembly 3 directly acts on the diseased tissue. The snare handle 1 and the pulling handle 2 are operating ends. The snare assembly 3 includes a snare head 301, a traction wire 302, and a pull rope 303. The snare head 301 is a circular structure formed by bending a metal wire. After the two ends of the snare head 301 are butt-jointed, the end of the snare head 301 is connected to the pull rope 303. A butt-jointed tube 5 can also be provided between the snare head 301 and the pull rope 303 to facilitate the fixation of the snare head 301 and the pull rope 303.
[0036] The snare handle 1 has a snare slip ring 101 capable of reciprocating movement and an electrode seat 104 located on the snare slip ring 101. The pulling handle 2 has a pulling slip ring 201 capable of reciprocating movement. One end of the pull cable 303 is connected to the end of the loop head 301, and the other end of the pull cable 303 passes through the outer tube 4 and is connected to the snare slip ring 101. When the snare slip ring 101 is slid, the loop head 301 can be driven to extend or retract into the outer tube 4 by the pull cable 303; one end of the traction wire 302 is connected to the snare assembly 3 or the outer tube 4, and the other end passes through the outer tube 4 and is connected to the pulling slip ring 201. The traction slip ring 201 drives the loop head 301 to bend to one side by pulling the traction wire 302. The bending to one side refers to the side perpendicular to the circle surface formed by the loop head 301, that is, the entire loop head 301 is tilted and is not in the same plane as the snare handle 1 and the pulling handle 2.
[0037] Example 1
[0038] like Figure 1-Figure 3 As shown, a flexible snare device includes a snare handle 1, a pulling handle 2, a snare assembly 3 and an outer tube 4. The snare handle 1 includes a snare core rod 102, a snare nut 103 and a snare slip ring 101. The snare slip ring 101 is slidably arranged on the snare core rod 102. The snare slip ring 101 is provided with an electrode seat 104 for connecting an electrode plug 10. The electrode plug 10 is connected to a high-frequency electric knife for power supply, and the high-frequency current is transmitted to the snare head 301 through the pull rope 303 to achieve the effect of electric cutting of the lesion site.
[0039] The pulling handle 2 includes a pulling core rod 202, a pulling slip ring 201 and a pulling nut 203. The snare handle 1, the pulling handle 2 and the outer tube 4 are connected through a tee tube 7. The pulling slip ring 201 is slidably set on the pulling core rod 202. The snare core rod 102 is connected to the interface of one end of the tee tube 7 and is locked on the outside with a snare nut 103. The pulling core rod 202 is connected to the interface of the other end of the tee tube 7 and is locked on the outside with a pulling nut 203. The third interface of the tee tube 7 is connected to the sheath tube 6, and the outer tube 4 is connected to the tee tube 7 through the sheath tube 6.
[0040] The outer tube 4 extends along the axis of the snare handle 1. A third incision 401 can be provided on the outer tube 4 at the intersection of the tee tube 7. The traction wire 302 passes through the third incision 401 and enters the branch where the traction handle 2 is located (such as Figure 9 shown).
[0041] In the present embodiment, traction wire 302 is connected with the middle part of loop head 301, and traction wire 302 is connected with loop head 301 by at least two connection points 8 on both sides of the axis of symmetry of loop head 301, and each traction wire 302 is located at the same side of loop head 301. Connection points 8 are distributed on both sides of loop head 301 axis of symmetry in order to be able to drive loop head 301 overall bending. Each traction wire 302 is located at the same side of loop head 301 and refers to that each traction wire 302 is located at the same side of the plane where loop head 301 is located, can drive loop head 301 to tilt towards the same direction. Each connection point 8 extends a traction wire 302 to outer tube 4 direction, so the quantity of traction wire 302 is identical with the quantity of connection points 8, each traction wire 302 can extend into outer tube 4 after the end of loop head 301 is gathered, also can each traction wire 302 extend respectively in outer tube 4.
[0042] When the movement of all traction wires 302 is controlled by the same pulling slip ring 201, if multiple connection points 8 are set on the same side of the symmetry axis of the loop head 301, the plane of the loop head 301 may be distorted due to the different pulling lengths of each connection point 8, thereby failing to fit well with the surface of the lesion tissue. For this reason, in this embodiment, two traction wires 302 are symmetrically arranged, and each traction wire 302 forms a connection point 8 with the loop head 301 (such as Figure 3 shown).
[0043] Regarding the connection between the traction wire 302 and the loop head 301, the traction wire 302 can be directly fixed on the loop head 301. However, after frequent pulling, the connection point 8 of the loop head 301 is subjected to greater stress and wear, resulting in a reduced service life of the loop head 301. For this reason, a sliding tube 304 is sleeved on the loop head 301, and the connection point 8 between the traction wire 302 and the loop head 301 is located on the sliding tube 304. The loop head 301 also has a limiting structure that inhibits the traction wire 302 from moving toward the end of the loop head 301. When the pulling slip ring 201 slides backward to pull the traction wire 302, the traction wire 302 will drive the sliding tube 304 to slide in the direction of the limiting structure until the sliding tube 304 reaches the limiting structure. At this time, the traction wire 302 can drive the loop head 301 to bend, such as Figure 5 and Figure 6 As shown, when the pulling slip ring 201 slides forward to release the traction wire 302, the loop head 301 gradually returns to its original position. At the same time, the traction wire 302 drives the sliding tube 304 to slide along the loop head 301, thereby reducing the stress on the bending part of the loop head 301 (located on the side of the limiting structure) and improving the service life of the loop head 301.
[0044] The limiting structure can be a limiting tube 305 fixed to the ring head 301, such as Figure 3 As shown, the limiting tube 305 is located on the right side of the sliding tube 304 and is relatively close to the sliding tube 304 .
[0045] In other optional embodiments, the ring head 301 can be designed as a variable cross-section structure. In this case, the limiting structure is a thickened section of the ring head 301. Figure 3 The diameter of the ring head 301 on the right side of the middle sliding tube 304 is thickened. When the sliding tube 304 slides to the right, the sliding tube 304 cannot continue to slide to the right due to the thickening of the diameter of the ring head 301.
[0046] Usage process: put the front end of the device through the endoscope channel hole to the lesion position, rotate the snare core rod 102 to drive the snare head 301 to rotate through the cable 303, so that the snare head 301 is facing the lesion. Figure 4 In the state shown, pull the traction slip ring 201, drive the traction wire 302 to bend the loop head 301 until the loop head 301 fits the root of the lesion. At this time, the loop head 301 is in Figure 6 In the state shown, pull the snare slip ring 101, tighten the loop head 301, connect the electrode plug 10 to the high-frequency electric knife and power it on, and continue to pull the snare slip ring 101 until the lesion is completely removed.
[0047] Example 2
[0048] The difference between this embodiment and the first embodiment is that the traction wire 302 is not connected to the loop head 301, but is connected to the outer tube 4. The specific connection method is as follows: Figure 7 and Figure 8 As shown, the outer circumference of the outer tube 4 is provided with a first incision 402 communicating with the interior of the outer tube 4. The traction wire 302 extends out of the first incision 402 and then extends to one end of the outer tube 4 connected to the loop head 301 and is fixed to the outer tube 4, so that the outer tube 4 portion between the first incision 402 and the loop head 301 can be bent. Figure 8 As shown, the left end of the outer tube 4 is connected to the loop head 301, and a curved section 403 is provided at the left end of the outer tube 4. The first incision 402 is located at the right end of the curved section 403. The left end of the curved section 403 is the fixed end of the traction wire 302 and the outer tube 4. On the curved section 403, the traction wire 302 is located outside the outer tube 4. After passing through the first incision 402, the traction wire 302 enters the outer tube 4 and extends to the right. When the pulling slip ring 201 slides backward to pull the traction wire 302, the traction wire 302 will pull the left end of the curved section 403, causing the curved section 403 to bend, thereby driving the loop head 301 connected thereto to tilt, as shown in FIG. Figure 12 and Figure 13 shown.
[0049] In this embodiment, the traction wire 302 and the pull rope 303 can be located together in the inner cavity of the outer tube 4, or the outer tube 4 can be set as a double-lumen tube, that is, the outer tube 4 has a first cavity 404 and a second cavity 405 extending coaxially, such as Figure 10 As shown, the first cavity 404 has a larger diameter and is the main cavity. The pull rope 303 is passed through the first cavity 404. The second cavity 405 has a smaller diameter and the traction wire 302 is passed through the second cavity 405. At this time, the first incision 402 only needs to be connected to the second cavity 405, and the first cavity 404 can still maintain its complete structure, which can improve the safety during electric surgery.
[0050] One end of the traction wire 302 extending out of the outer tube 4 can be fixed to the outer tube 4 by a pulling and fixing tube 9. The pulling and fixing tube 9 is covered on the outside of the outer tube 4. In order to make the overall structure of the tube body smoother, it is preferred to cut a second incision 406 connected to the second cavity 405 at one end of the outer tube 4 connecting ring head 301. The traction wire 302 is fixed at the second incision 406 through the pulling and fixing tube 9. The setting of the second incision 406 can make the end of the traction wire 302 re-enter the second cavity 405, and the pulling and fixing tube 9 can be flush with the outer wall of the outer tube 4. After the two are connected, a tubular structure with the same cross-section as the outer tube 4 is formed.
[0051] Usage process: put the front end of the device through the endoscope channel hole to the lesion position, rotate the snare core rod 102 to drive the snare head 301 to rotate through the cable 303, so that the snare head 301 is facing the lesion. Figure 11 In the state shown, pull the pulling slip ring 201, drive the traction wire 302 to bend the curved portion of the outer tube 4, and the outer tube 4 drives the loop head 301 to bend until the loop head 301 fits the root of the lesion. At this time, the loop head 301 is in Figure 12 In the state shown, pull the snare slip ring 101, tighten the loop head 301, connect the electrode plug 10 to the high-frequency electric knife and power it on, and continue to pull the snare slip ring 101 until the lesion is completely removed.
[0052] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", etc., indicating directions or positional relationships, are 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, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0053] Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the term "connected" should be understood broadly. For example, it can mean 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 an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.
[0054] In this specification, the schematic representations of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments.
[0055] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.
Claims
1. A flexible snare device, characterized in that: The invention comprises a snare handle (1), a pulling handle (2), a snare assembly (3) and an outer tube (4), wherein the snare assembly (3) comprises a snare head (301), a pulling wire (302) and a pulling cable (303), wherein the snare handle (1) and the pulling handle (2) are both connected to the outer tube (4), the snare handle (1) comprises a snare slip ring (101) capable of reciprocating movement and an electrode holder (104) located on the snare slip ring (101), and the pulling handle (2) comprises a pulling slip ring (201) capable of reciprocating movement, one end of the pulling cable (303) is connected to the end of the snare head (301), and the other end of the pulling cable (303) passes through the outer tube (4) and is connected to the snare slip ring (101); One end of the traction wire (302) is connected to the snare assembly (3) or the outer tube (4), and the other end passes through the outer tube (4) and is connected to the pulling slip ring (201). The pulling slip ring (201) drives the loop head (301) to bend to one side by pulling the traction wire (302).
2. The flexible snare device according to claim 1, wherein: The traction wire (302) is connected to the middle part of the loop head (301), and the traction wire (302) and the loop head (301) are connected through at least two connection points (8) located on both sides of the symmetry axis of the loop head (301), and each traction wire (302) is located on the same side of the loop head (301).
3. The flexible snare device according to claim 2, wherein: Two traction wires (302) are symmetrically arranged, and each traction wire (302) forms a connection point (8) with the loop head (301).
4. The flexible snare device according to claim 2, wherein: The loop head (301) is sleeved with a sliding tube (304), the connection point (8) between the traction wire (302) and the loop head (301) is located on the sliding tube (304), and the loop head (301) also has a limiting structure for inhibiting the traction wire (302) from moving toward the end of the loop head (301).
5. The flexible snare device according to claim 4, wherein: The limiting structure is a limiting tube (305) fixed to the ring head (301).
6. The flexible snare device according to claim 4, wherein: The ring head (301) is a variable cross-section structure, and the limiting structure is a thickened section of the ring head (301).
7. The flexible snare device according to claim 1, wherein: The outer circumference of the outer tube (4) is provided with a first incision (402) communicating with the interior of the outer tube (4); the traction wire (302) extends from the first incision (402) to one end of the outer tube (4) connecting the loop head (301) and is fixed to the outer tube (4), so that the portion of the outer tube (4) between the first incision (402) and the loop head (301) can be bent.
8. The flexible snare device according to claim 7, wherein: The outer tube (4) has a first cavity (404) and a second cavity (405) extending coaxially, the pull cable (303) is located in the first cavity (404), the traction wire (302) is located in the second cavity (405), and the incision is connected to the second cavity (405).
9. The flexible snare device according to claim 7, wherein: One end of the outer tube (4) connected to the ring head (301) is cut with a second incision (406) communicating with the second cavity (405), and the traction wire (302) is fixed to the second incision (406) by pulling the fixing tube (9).
10. The flexible snare device according to claim 1, wherein: The snare handle (1) includes a snare core rod (102) and a snare nut (103), and the pulling handle (2) includes a pulling core rod (202) and a pulling nut (203). The snare handle (1), the pulling handle (2) and the outer tube (4) are connected via a three-way pipe (7). The snare slip ring (101) is slidably arranged on the snare core rod (102), and the pulling slip ring (201) is slidably arranged on the pulling core rod (202). The snare core rod (102) and the three-way pipe (7) are connected via the snare nut (103), and the pulling core rod (202) and the three-way pipe (7) are connected via the pulling nut (203).