High efficiency tangential ligation device

Abstract

This utility model belongs to the field of medical device technology, specifically relating to a high-efficiency ligation device for cutting sutures. It includes an elastic wire assembly, a ligation assembly, and a firing assembly. The elastic wire assembly includes a coil and an elastic wire connected to the end of the coil to adjust its diameter. The ligation assembly includes a cutter that performs linear reciprocating motion. The firing assembly includes a central tube for mounting the coil and a pusher sleeve for pushing the coil on the central tube to the lesion site. The pusher sleeve includes a pushing part and a blade part forming a cutting channel. The elastic wire is located between the pushing part and the blade part, and the cutter can extend from the blade part towards the pushing part to cut the elastic wire. During cutting, the pushing part is placed under the elastic wire for support. This utility model places the elastic wire between the cutter and the pusher sleeve, and utilizes the pusher sleeve placed under the elastic wire to provide support for the cutter during the cutting process, thereby quickly cutting the elastic wire and improving operational accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a high-efficiency tangential ligation device. Background Technology

[0002] The ligation device is mainly used to treat internal hemorrhoids and for wound closure after polyp removal. Its basic principle is to push an elastic coil onto the target lesion, such as a hemorrhoid, using a pushing mechanism. Then, a tightening assembly pulls and tightens the elastic wire connected to the base of the coil, firmly binding the coil to the base of the lesion, blocking its blood supply, and ultimately causing the lesion to necrose and slough off. After ligation, excess elastic wire needs to be cut to allow the device to be removed or for the next ligation operation.

[0003] In existing technologies, a built-in cutting assembly is typically used for suture cutting. The operator pushes the cutting blade forward, using its sharp edge to cut the elastic wire in its path. However, the elastic wire used to tighten the coil itself has good elastic properties. When the cutting blade is pushed forward to contact and attempt to cut the elastic wire, due to the elasticity of the wire, the cutting edge does not immediately cut the wire. Instead, it first applies a positive compressive force to the elastic wire. Under this compressive force, the taut elastic wire undergoes significant elastic tensile deformation and elongation. This means that the cutting blade, with its fixed stroke, may only complete the stretching of the elastic wire without reaching or exceeding its breaking strength, meaning the elastic wire is not completely cut. This increases the complexity and uncertainty of the operation, resulting in reduced operational accuracy. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the problem that in the prior art, the cutter with a fixed stroke may only complete the stretching of the elastic line located on its forward path, but fails to reach or exceed its breaking strength, that is, the elastic line is not completely cut, which increases the complexity and uncertainty of the operation and reduces the accuracy of the operation, a high-efficiency cutting banding device is provided.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a high-efficiency tangential ligation device, comprising:

[0006] The elastic cord assembly includes a coil and an elastic cord connected to the end of the coil to pull the coil and adjust the coil diameter;

[0007] A tangent assembly, including a cutter that performs a linear reciprocating motion;

[0008] The firing assembly includes a central tube for mounting a coil and a push sleeve for pushing the coil on the central tube to the lesion site. The push sleeve includes a pushing part and a sleeve part with a cutting channel. The elastic wire is located between the pushing part and the sleeve part, and the cutter can extend out of the sleeve part in the direction of the pushing part to cut the elastic wire. During the cutting, the pushing part is placed at the bottom of the elastic wire for support.

[0009] Furthermore, it also includes a tensioning assembly, which includes a pull rod detachably connected to the proximal end of the elastic cord.

[0010] Furthermore, a window for the elastic wire to enter and exit is formed between the far end of the pushing part and the far end of the sheath part.

[0011] Furthermore, the elastic cord includes a cord body and a ball head protruding from one end of the cord body away from the coil. The portion of the pull rod facing the window has an insert groove for the ball head to be inserted and confined inside, and a groove communicating with the insert groove for the cord body to enter.

[0012] Furthermore, both the pushing part and the cutting tool part protrude towards each other to form a limiting part for restricting the sliding of the line.

[0013] Furthermore, the push sleeve includes two snap-fit ​​half-sleeves, with the window formed on the side of one of the half-sleeves.

[0014] Furthermore, the cutter includes a straight handle and a curved blade connected to the distal end of the handle, and the distal end of the cutter channel has an opening for the blade to extend out.

[0015] Furthermore, a deformation groove is provided at the connection between the blade and the handle.

[0016] The beneficial effects of this utility model are as follows: This utility model sets the elastic cord between the cutter and the push sleeve, and uses the push sleeve placed at the bottom of the elastic cord to provide support for the cutter during the cutting process, thereby quickly cutting the elastic cord and improving the operating accuracy. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention from a first-person perspective (after removing one half of the set);

[0019] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0020] Figure 3 This is a three-dimensional schematic diagram of the second perspective of this utility model (after removing the handle part and a half-sleeve).

[0021] Figure 4 yes Figure 3 A magnified view of part B in the middle section;

[0022] Figure 5 It is a partial main view;

[0023] Figure 6 This is a schematic diagram showing the connection between the pull rod and the elastic cord assembly;

[0024] Figure 7 This is a schematic diagram of the cutter's structure.

[0025] In the picture:

[0026] 1. Elastic cord assembly; 101. Coil; 102. Elastic cord; 1021. Cord body; 1022. Ball head;

[0027] 2. Cutting blade; 201. Handle; 202. Blade; 2021. Deformation groove;

[0028] 3. Firing assembly; 301. Center tube; 302. Push sleeve; 3021. Pushing part; 3022. Blade sleeve part; 3022a. Cutting channel; 3023. Window; 3024. Limiting part; 3025. Slot; 3026. Positioning post;

[0029] 4. Tie rod; 401. Embedded groove; 402. Wire groove. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] like Figures 1-7 As shown, this utility model is a high-efficiency tangential ligation device, comprising:

[0032] The elastic cord assembly 1 includes a coil 101 and an elastic cord 102 connected to the end of the coil 101 to pull the coil 101 and adjust the coil diameter of the coil 101. After the coil 101 reaches the lesion site and is fitted around the lesion site, the coil 101 can be tightened by pulling the coil 101 towards the proximal end, which is the end closest to the operator.

[0033] The tangent assembly includes a cutter 2 that performs linear reciprocating motion;

[0034] The firing assembly 3 includes a central tube 301 for mounting the coil 101 and a push sleeve 302 for pushing the coil 101 on the central tube 301 to the lesion site. The push sleeve 302 is mounted on the outside of the central tube 301. In the initial state, the coil 101 is mounted on the far end of the central tube 301, which is the end away from the operator. When in use, a negative pressure is generated in the central tube 301 to attract the lesion site, and the push sleeve 302 moves to the far end to push the coil 101 to the lesion site.

[0035] The push sleeve 302 includes a pushing part 3021 and a sleeve part 3022 with a cutting channel 3022a. The pushing part 3021 is generally cylindrical and its diameter is approximately equal to the diameter of the coil 101 to achieve the pushing effect. The sleeve part 3022 is formed above the pushing part 3021. The cutting channel 3022a matches the shape of the cutter 2 and its width is slightly greater than the thickness of the cutter 2. The cutter 2 can reciprocate within the cutting channel 3022a. The elastic wire 102 is located between the pushing part 3021 and the sleeve part 3022, and the cutter 2 can extend the sleeve part 3022 towards the pushing part 3021 to cut the elastic wire 102. During cutting, the pushing part 3021 is placed at the bottom of the elastic wire 102 for support.

[0036] When cutting the line, the cutter 2 moves to the far end and extends downwards into the sleeve part 3022. The push part 3021 located at the bottom of the elastic line 102 can support the elastic line 102, which is equivalent to providing an anvil, thereby quickly cutting the elastic line 102 and improving the operation accuracy.

[0037] In some examples, a tensioning assembly is also included, which includes a pull rod 4 detachably connected to the proximal end of the elastic wire 102. The pull rod 4 can perform linear reciprocating motion to tighten the elastic wire 102 to tighten the lesion site. The detachable structure of the pull rod 4 and the elastic wire 102 allows for quick replacement of the elastic wire assembly 1, thereby enabling continuous firing of the coil 101.

[0038] In some examples, a window 3023 for the elastic wire 102 to enter and exit is formed between the distal end of the pusher 3021 and the distal end of the sheath 3022. When replacing the coil 101, the entire elastic wire assembly 1 is removed from the pull rod 4 and taken out through the window 3023. Then, the new elastic wire assembly 1 can be sent in through the window 3023 and connected to the pull rod 4.

[0039] In some examples, the elastic cord 102 includes a cord body 1021 and a ball head 1022 protruding from one end of the cord body 1021 away from the coil 101. The pull rod 4 has an insert groove 401 for the ball head 1022 to be inserted into and confined inside the window 3023, and a groove 402 communicating with the insert groove 401 for the cord body 1021 to enter. The window 3023 includes a large notch for the ball head 1022 to enter and exit and a small notch for the cord body 1021 to enter and exit.

[0040] Neither the embedding groove 401 nor the wire groove 402 is a radial through groove, and both have a groove opening and a groove bottom to form a semi-enclosed structure. Furthermore, the groove openings of both the embedding groove 401 and the wire groove 402 are constricted structures, which can improve the connection strength between the pull rod 4 and the elastic wire assembly 1.

[0041] The cross-sectional area of ​​the embedding groove 401 is larger than that of the wire groove 402 to form a limiting step between the two. The limiting step can limit the ball head 1022 from disengaging from the pull rod 4 at the far end, thereby axially limiting the ball head 1022 in the embedding groove 401. The embedding groove 401 with the constricted structure can radially limit the ball head 1022 in the embedding groove 401 (the "limiting" here is not absolutely fixed). The ball head 1022 can disengage from the embedding groove 401 under a certain external force to realize the replacement of the elastic wire assembly 1. Preferably, the end of the elastic wire 102 away from the coil 101 is sleeved with a sleeve. The sleeve includes a tube body and a protrusion formed at the end of the tube body. The ball head 1022 is limited in the protrusion body. The wire body 1021 is partially located in the tube body and partially extends out of the tube body. The hardness of the protrusion body is greater than that of the ball head 1022, which is conducive to entering or disengaging from the embedding groove 401.

[0042] The wire groove 402 axially penetrates one end of the pull rod 4, so that the wire 1021 enters the wire groove 402 and is partially located in the wire groove 402 to connect with the ball head 1022. The part of the wire 102 extends out of the pull rod 4 to connect with the coil 101. At the same time, the wire groove 402 penetrating the end of the pull rod 4 allows the embedding groove 401 to undergo a certain deformation during the process of the ball head 1022 being pressed into the embedding groove 401 to allow the ball head 1022 to enter. When the pull rod 4 is pulled towards the proximal end, the force applied to the ball head 1022 through the embedding groove 401 is along its axial direction, and the ball head 1022 is not subjected to radial force.

[0043] In some examples, the pushing part 3021 and the sheath part 3022 both protrude toward each other to form a limiting part 3024 for restricting the sliding of the line 1021. The limiting part 3024 partially blocks the part of the window 3023 facing the line 1021, allowing the line 1021 to enter and restricting its sliding to a certain extent.

[0044] In some examples, the push sleeve 302 includes two snap-fit ​​half-sleeves, and the window 3023 is formed on the side of one of the half-sleeves;

[0045] Two halves of the assembly are provided with a number of spaced hooks and slots 3025 for the hooks to be inserted along their axial direction. The hooks and slots 3025 correspond one-to-one, and each hook is inserted into its corresponding slot 3025. The distal ends of the two halves of the assembly are provided with positioning posts 3026 and positioning grooves for the positioning posts 3026 to be inserted. The number of positioning posts 3026 corresponds to the number of positioning grooves, which can be, but is not limited to, one, two, or three. Each positioning post 3026 is inserted into its corresponding positioning groove. First, the positioning posts 3026 and the positioning grooves cooperate to guide the assembly process of the two halves of the assembly. Then, the hooks are inserted into the slots 3025 to lock the two halves of the assembly.

[0046] In some examples, the cutter 2 includes a straight handle 201 and a curved blade 202 connected to the distal end of the handle 201 and having a cutting edge. The handle 201 and the blade 202 are integrally formed and have an arc transition. The distal end of the cutter channel 3022a has an opening for the blade 202 to extend out. As the blade 202 moves toward the distal end, it can deform under the pressure of the cutter channel 3022a to extend out of the opening.

[0047] In some examples, a deformation groove 2021 is provided at the connection between the blade 202 and the handle 201. The deformation groove 2021 is an elongated oval groove structure, which makes it easier for the blade 202 to deform and extend out of the cutting channel 3022a.

[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-efficiency tangential ligation device, characterized in that: include: The elastic cord assembly (1) includes a coil (101) and an elastic cord (102) connected to the end of the coil (101) to pull the coil (101) and adjust the diameter of the coil (101). The tangent assembly includes a cutter (2) that makes a linear reciprocating motion; The firing assembly (3) includes a central tube (301) for mounting the coil (101) and a push sleeve (302) for pushing the coil (101) on the central tube (301) to the lesion site. The push sleeve (302) includes a pushing part (3021) and a sleeve part (3022) with a cutting channel (3022a). The elastic wire (102) is located between the pushing part (3021) and the sleeve part (3022), and the cutter (2) can extend the sleeve part (3022) toward the pushing part (3021) to cut the elastic wire (102). During the cutting, the pushing part (3021) is placed at the bottom of the elastic wire (102) for support.

2. The high-efficiency tangential ligation device according to claim 1, characterized in that: It also includes a tensioning assembly, which includes a pull rod (4) detachably connected to the proximal end of the elastic cord (102).

3. The high-efficiency tangential ligation device according to claim 2, characterized in that: A window (3023) for the elastic line (102) to enter and exit is formed between the far end of the pushing part (3021) and the far end of the sheath part (3022).

4. The high-efficiency tangential ligation device according to claim 3, characterized in that: The elastic cord (102) includes a cord body (1021) and a ball head (1022) protruding from one end of the cord body (1021) away from the coil (101). The pull rod (4) has an insert groove (401) for the ball head (1022) to be inserted and confined inside, and a groove (402) communicating with the insert groove (401) for the cord body (1021) to enter.

5. The high-efficiency tangential ligation device according to claim 4, characterized in that: Both the pushing part (3021) and the sheath part (3022) protrude toward each other to form a limiting part (3024) for restricting the sliding of the line body (1021).

6. The high-efficiency tangential ligation device according to claim 3, characterized in that: The push sleeve (302) includes two snap-fit ​​half sleeves, and the window (3023) is formed on the side of one of the half sleeves.

7. The high-efficiency tangential ligation device according to claim 1, characterized in that: The cutter (2) includes a straight handle (201) and a curved blade (202) connected to the distal end of the handle (201), and the distal end of the cutter channel (3022a) has an opening for the blade (202) to extend out.

8. The high-efficiency tangential ligation device according to claim 7, characterized in that: A deformation groove (2021) is provided at the connection between the blade (202) and the handle (201).

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