A lateral wire loading tightener and its ligator

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, concretely relates to a lateral wire loading type tight wire mechanism and its ligator, including elastic line subassembly and pull rod, and the elastic line subassembly includes the elastic line for drawing the collar to adjust the collar diameter and the elastic line is protruded to form the lug at one end of the collar, the pull rod lateral wall is recessed to form the clamping groove for the lateral clamping of the lug and the lug is limited in its inside and the through slot is communicated with the clamping groove to supply the lateral entry of the elastic line, the cross section area of the clamping groove is greater than the through slot cross section area to form the first limit step for limiting the lug movement to the collar direction between both, the utility model utilizes the clamping groove formed in the pull rod lateral wall to limit the lug, and the tension of the elastic line to the lug is along the axial direction, the slot direction of the clamping groove is towards the side, the lug without lateral stress will not laterally come out of the clamping groove, and the first step can limit the axial displacement of the lug, thereby improving the connection strength of the lug and the pull rod.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a lateral suture tightening mechanism and its ligator. Background Technology

[0002] A ligation device typically consists of an elastic loop and a tensioning mechanism for tightening the loop. To enable continuous operation and improve surgical efficiency, the ligation device is designed to be reusable. Therefore, the elastic thread at the tail of the elastic loop needs to be quickly, reliably, and detachably connected to the front end of the tensioning mechanism's lever. This allows for easy installation of the next loop after the current loop is used and cut off, enabling the continuation of the surgery.

[0003] In existing technologies, the protrusion at the end of the elastic cord is aligned (i.e., along the axial direction of the pull rod) and pressed into the elastic jaw located at the end of the pull rod. Under the action of external force, the protrusion presses against the elastic arm of the jaw, causing it to open radially outward, allowing the protrusion to enter the inside of the jaw, and clamping the protrusion inside the jaw, thereby achieving the connection.

[0004] However, during the tightening process of the collar, the elastic cord is under high tension. At this time, the elastic cord exerts a strong pulling force on the jaws through the protrusion, and in order for the jaws to maintain their grip on the protrusion, their elastic arms must generate a radially inward clamping force to resist the tendency of the protrusion to disengage. The two forces are opposite in direction and counteract each other. Especially when used frequently or with large tightening forces, the elastic arms of the jaws are prone to permanent plastic deformation or even cracking due to material fatigue or exceeding their elastic limit, which is the so-called "bursting" phenomenon. The protrusion may then accidentally disengage from the damaged jaws. This not only interrupts the current surgery, causing the collar to fail to tighten or suddenly loosen, requiring the collar to be reinstalled, prolonging the operation time, increasing patient risks, but also poses a serious medical safety hazard. Utility Model Content

[0005] The technical problem to be solved by this utility model is: In order to solve the problem that in the prior art, the protrusion at the end of the elastic wire is usually aligned with the pull rod axis and pressed into the elastic claw at the end of the pull rod, the claw is prone to "bursting" when used frequently or with large tightening force, and the protrusion may accidentally fall out of the damaged claw. The present invention provides a side-mounted wire tightening mechanism and its sleeve.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a side-mounted wire tightening mechanism, including an elastic wire assembly and a pull rod detachably connected to the elastic wire assembly to tighten or loosen the elastic wire assembly;

[0007] The elastic cord assembly includes a collar and an elastic cord for pulling the collar to adjust the collar diameter, with a protruding head at one end of the elastic cord away from the collar.

[0008] The pull rod sidewall is recessed to form a groove for the protrusion to be laterally engaged and confined within it, and a through groove communicating with the groove for the elastic line to laterally enter. The cross-sectional area of ​​the groove is larger than the cross-sectional area of ​​the through groove to form a first limiting step between the two for limiting the movement of the protrusion in the direction of the collar, and the through groove penetrates through the end of the pull rod.

[0009] Furthermore, a sleeve is fitted around the end of the elastic cord away from the collar, the sleeve comprising a tube body and the aforementioned protrusion.

[0010] Furthermore, the sleeve has a tube hole extending axially to allow the elastic line to pass through. The end of the elastic line opposite to the collar protrudes to form a protrusion. The protrusion is recessed to form a receiving groove for accommodating the protrusion. A second limiting step is formed between the receiving groove and the tube hole to restrict the movement of the protrusion toward the tube body.

[0011] Furthermore, the protrusion has a spherical structure.

[0012] Furthermore, the tie rod has a rod hole extending along its axial direction to form a hollow structure.

[0013] Furthermore, the slot opening is chamfered.

[0014] A tying device includes the aforementioned lateral wire-loading tensioning mechanism.

[0015] The beneficial effects of this utility model are as follows: This utility model uses a groove formed on the side wall of the pull rod to limit the protrusion. The tension of the elastic line on the protrusion is along the axial direction. The groove opening faces to the side. The protrusion that is not subjected to lateral force will not come out of the groove. Furthermore, the first step can limit the axial displacement of the protrusion, thereby improving the connection strength between the protrusion and the pull rod. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a structural schematic diagram of the elastic wire assembly in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the banding device after part of the housing has been removed;

[0021] In the picture:

[0022] 1. Elastic cord assembly; 101. Loop; 102. Elastic cord; 103. Protrusion; 104. Sleeve; 105. Tube hole; 106. Protrusion; 107. Receiving groove; 108. Second limiting step;

[0023] 2. Pull rod; 201. Slot; 202. Through slot; 203. First limit step;

[0024] 3. Outer shell;

[0025] 4. Negative pressure pipe;

[0026] 5. Cutting knife. Detailed Implementation

[0027] 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.

[0028] like Figures 1-4 As shown, this utility model is a lateral thread tightening mechanism, including an elastic thread assembly 1 and a pull rod 2 detachably connected to the elastic thread assembly 1 to tighten or loosen the elastic thread assembly 1. The pull rod 2 can be driven to make linear reciprocating motion by electric or manual means. When the pull rod 2 moves to the distal end (away from the lesion tissue), the pull rod 2 tightens the elastic thread assembly 1 to tighten the lesion area. When the pull rod 2 moves to the proximal end (closer to the lesion tissue), the elastic thread assembly 1 is in a relaxed state.

[0029] The elastic cord assembly 1 includes a collar 101 and an elastic cord 102 for pulling the collar 101 to adjust the diameter of the collar 101. The end of the elastic cord 102 opposite to the collar 101 has a protruding head 103.

[0030] The side wall of the pull rod 2 is recessed to form a slot 201 for the protrusion 103 to be laterally inserted and confined within it, and a through groove 202 communicating with the slot 201 for the elastic line 102 to enter laterally. Both the slot 201 and the through groove 202 have a groove opening and a groove bottom, forming a semi-enclosed structure. That is, the slot 201 and the through groove 202 are not radially through grooves, and the groove openings are both constricted structures.

[0031] The cross-sectional area of ​​the slot 201 is larger than that of the through slot 202, so that a first limiting step 203 is formed between the two to limit the movement of the protrusion 103 toward the collar 101. This allows the protrusion 103 to be axially limited within the slot 201. The through slot 202 passes through the end of the pull rod 2, so that the elastic cord 102 enters the through slot 202 and is partially located inside the through slot 202 and connected to the protrusion 103, and partially located outside the through slot 202 and connected to the collar 101. At the same time, the through slot 202 passing through the end of the pull rod 2 allows the slot 201 to undergo a certain deformation during the process of the protrusion 103 being pressed into the slot 201 to allow the protrusion 103 to enter. When the elastic cord 102 is tightened, the force applied to the protrusion 103 is along the axial direction. The protrusion 103 is not subjected to lateral force. Therefore, the slot 201 only needs to deform slightly. That is, the clamping force of the slot 201 on the protrusion 103 does not need to be too large, only enough to ensure that it will not slip out accidentally.

[0032] When installing the elastic cord assembly 1, the protrusion 103 is first pressed laterally into the slot 201, and the elastic cord 102 is inserted laterally into the through slot 202. The first limiting step 203 can limit the axial displacement of the protrusion 103, so that the pull rod 2 is fixed to the elastic cord assembly 1. In this embodiment, the slot 201 formed on the side wall of the pull rod 2 is used to limit the protrusion 103. The tension of the elastic cord 102 on the protrusion 103 is along the axial direction. The slot opening of the slot 201 faces to the side (i.e., radially perpendicular to the axial direction). The protrusion 103 will not radially dislodge from the slot 201. Furthermore, the first step can limit the axial displacement of the protrusion 103, thereby improving the connection strength between the protrusion 103 and the pull rod 2.

[0033] In some examples, a sleeve 104 is fitted around the end of the elastic cord 102 away from the collar 101. The sleeve 104 includes a tube body and the aforementioned protrusion 103. The protrusion 103 is formed at the end of the tube body and enters the slot 201 laterally. The tube body enters the through slot 202 laterally. The sleeve 104 has a larger diameter and higher hardness than the elastic cord 102. The cut elastic cord 102 and the sleeve 104 form an assembly. Pulling the sleeve 104 makes it easy to remove the assembly to replace the next elastic cord assembly 1.

[0034] In some examples, the sleeve 104 has a tube hole 105 extending axially to allow the elastic cord 102 to pass through. The end of the elastic cord 102 opposite to the collar 101 protrudes to form a protrusion 106. The protrusion 103 is recessed to form a receiving groove 107 for accommodating the protrusion 106. The cross-sectional area of ​​the receiving groove 107 is larger than the cross-sectional area of ​​the tube hole 105 to form a second limiting step 108 between them to restrict the movement of the protrusion 106 toward the tube body. The elastic cord 102 passes through the tube hole 105. The collar 101 formed at one end of the elastic cord 102 can restrict the degree of freedom of the elastic cord 102 to move distally. The protrusion 106 formed at the other end of the elastic cord 102 abuts against the second limiting step 108 to restrict the degree of freedom of the elastic cord 102 to move proximally.

[0035] In some examples, the protrusion 103 and the protrusion 106 are both spherical structures, and correspondingly, the slot 201 and the receiving slot 107 are also spherical structures.

[0036] In some examples, the pull rod 2 has a rod hole extending along its axial direction to form a hollow structure, thereby reducing weight and minimizing operator fatigue. The rod hole communicates with the slot 201.

[0037] In some examples, the openings of the slots 201 and 202 are chamfered to facilitate the insertion of the protrusion 103 and reduce the pressing force.

[0038] In some examples, a ligator is also provided, including a housing 3, a negative pressure tube 4 for facing and adsorbing the lesion site, a cutter 5 for cutting the elastic thread 102, and the aforementioned lateral suture tightening mechanism.

[0039] 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 lateral wire-loading tensioning mechanism, characterized in that: Includes an elastic cord assembly (1) and a pull rod (2) detachably connected to the elastic cord assembly (1) to tighten or loosen the elastic cord assembly (1); The elastic cord assembly (1) includes a collar (101) and an elastic cord (102) for pulling the collar (101) to adjust the diameter of the collar (101). The elastic cord (102) has a protruding head (103) at one end away from the collar (101). The pull rod (2) has a recessed side wall forming a groove (201) for the protrusion (103) to be laterally engaged and for the protrusion (103) to be confined within it, and a through groove (202) communicating with the groove (201) for the elastic line (102) to be laterally entered. The cross-sectional area of ​​the groove (201) is larger than the cross-sectional area of ​​the through groove (202) so that a first limiting step (203) is formed between the two to limit the movement of the protrusion (103) toward the collar (101), and the through groove (202) penetrates the end of the pull rod (2).

2. The lateral wire-loading tensioning mechanism according to claim 1, characterized in that: The elastic line (102) is fitted with a sleeve (104) at one end away from the collar (101). The sleeve (104) includes a tube body and the aforementioned protrusion (103) located at the end of the tube body.

3. A lateral wire-loading tensioning mechanism according to claim 2, characterized in that: The sleeve (104) has a tube hole (105) extending axially to allow the elastic line (102) to pass through. The end of the elastic line (102) away from the collar (101) protrudes to form a protrusion (106). The protrusion (103) is recessed to form a receiving groove (107) for accommodating the protrusion (106). A second limiting step (108) is formed between the receiving groove (107) and the tube hole (105) to restrict the movement of the protrusion (106) toward the tube body.

4. A lateral wire-loading tensioning mechanism according to claim 1, characterized in that: The protrusion (103) has a spherical structure.

5. A lateral wire-loading tensioning mechanism according to claim 4, characterized in that: The tie rod (2) has a rod hole extending along its axial direction to form a hollow structure.

6. A lateral wire-loading tensioning mechanism according to claim 1, characterized in that: The slot (201) has a chamfered opening.

7. A ligation device, characterized in that: Includes the lateral wire-loading tensioning mechanism as described in any one of claims 1-6.

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