CN220213027U

CN220213027U - Tension limiting device for surgical forceps

Info

Publication number: CN220213027U
Application number: CN202320906731.7U
Authority: CN
Inventors: 姚伦; 申屠康源
Original assignee: Hangzhou Kangya Medical Instrument Co ltd
Current assignee: Hangzhou Kangya Medical Instrument Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-12-22
Anticipated expiration: 2033-04-19

Abstract

The utility model discloses a tension limiting device of surgical forceps, which comprises a fixed handle, a movable handle, a forceps head component, a limiting pull rod and a compression spring, wherein the fixed handle is connected with the movable handle; the front and the back of the limit pull rod are respectively connected with the clamp head assembly and the movable handle; the fixed handle is internally provided with a step channel with a large front part and a small rear part, and the front part of the limiting pull rod is provided with a corresponding limiting convex ring; the diameter of the limiting convex ring is positioned between the diameters of the step channels. According to the utility model, the step channel with large front and small rear is arranged in the fixed handle, and the limiting convex ring is correspondingly arranged on the limiting pull rod, so that the diameter of the limiting convex ring is between the front section and the rear section of the step channel, the limiting convex ring can move in the front section of the step channel and cannot enter the rear end of the step channel, the limiting convex ring and the step channel are abutted and locked to be blocked to be unable to continue moving after the movable handle is opened to a certain extent, the movable handle is unable to be opened continuously, and the clamp head assembly is prevented from being damaged by excessive pulling. The utility model has the advantage of not damaging the clamp head due to excessive opening.

Description

Tension limiting device for surgical forceps

Technical Field

The utility model relates to an operation tool, in particular to a tension limiting device for forceps.

Background

Surgical forceps are surgical instruments commonly used in the surgical process, are provided with various models and sizes according to functions and specifications, and are generally composed of forceps handles, forceps rods and forceps heads.

The sizes and the forms of the surgical forceps are different according to the application scenes. In the current minimally invasive surgery process, the operation needs to be carried out through a natural cavity channel of a human body or an operation channel is established, the surgical forceps are used as necessary instruments for minimally invasive surgery and are used together with an endoscope and a sheath (or other operation channels), so that the size of the surgical forceps is influenced by the sheath or the operation channel, and the size (particularly the diameter) of the surgical forceps is relatively fine. For example, forceps used during ureteroscopic procedures are required to access human surgical procedures through at least 5FR (about 1.66MM diameter) instrument channels. The diameters of the clamp head and the clamp rod are generally below 1.66mm, and the sizes of parts such as the clamp head connecting rod, the rivet and the like are smaller than the sizes, so that the structural strength is weaker. In addition, under the lever action of the handle, the grip force conduction acting on the handle causes the forceps head to generate a very large closing force, and the very high requirements are imposed on the use of operators and the production and manufacturing process of the forceps. In the actual use process, excessive force of doctors or misoperation in emergency often occurs, so that the handles exert excessive force, the easy-damaged parts such as rivets and connecting rods in the forceps heads are damaged due to the fact that pulling force is transmitted through the forceps rods, the risk that the parts such as the rivets fall off in a human body is increased, the operation time is delayed, and even serious adverse events are caused.

Therefore, the utility model aims to provide a tension limiting device for the surgical forceps, which is used for limiting the damage of forceps heads caused by overlarge tension of the existing miniature surgical forceps in the market. The utility model has the advantage that overload in tension does not cause damage to the clamp head.

Disclosure of Invention

The technical scheme of the utility model is as follows: a tension limiting device of surgical forceps comprises a fixed handle, a movable handle rotationally connected with the fixed handle, a forceps head assembly provided with the front end of the fixed handle, a limiting pull rod penetrating through the fixed handle and a compression spring sleeved on the limiting pull rod; the front end of the limiting pull rod is connected with the clamp head assembly, and the rear end of the limiting pull rod is clamped in the movable handle through the limiting convex ball; the fixed handle is internally provided with a step channel with a large front part and a small rear part, the limiting pull rod is arranged in the step channel in a penetrating way, and the front part of the limiting pull rod is provided with a limiting convex ring corresponding to the front section of the step channel; the diameter of the limiting convex ring is larger than that of the rear section of the step channel and smaller than that of the front section of the step channel.

In the tension limiting device of the forceps, the front section of the fixed handle is provided with a detachable nut; the movable handle is movably connected with the fixed handle through a cheek shaft screw.

In the tension limiting device for the surgical forceps, the rear section of the fixed handle is provided with the spring limiting groove, the front end of the compression spring is arranged in the spring limiting groove, and the rear end of the compression spring is in butt joint with the movable handle.

Compared with the prior art, the utility model has the advantages that the step channels with large front and small back are arranged in the fixed handle, the limiting convex rings are correspondingly arranged on the limiting pull rods, the diameter of each limiting convex ring is between the front section and the rear section of the step channel, the limiting convex rings can move in the front section of the step channel and cannot enter the rear end of the step channel, the movable handle is opened to a certain degree, the limiting convex rings and the step channel are abutted and locked to be blocked to be unable to continue moving, the movable handle is unable to continue closing, the handle closing force is unable to be conducted to the clamp head through the clamp rod, and the clamp head component cannot be damaged due to excessive pulling force of the clamp rod before the limiting convex rings and the step channel are not worn or damaged.

Therefore, the utility model has the advantage that overload of the pulling force can not cause damage to the clamp head.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an enlarged view at B in FIG. 1;

fig. 3 is an enlarged view at a in fig. 1.

The marks in the drawings are: the clamp comprises a 1-clamp head assembly, a 2-nut, a 3-limit pull rod, a 31-limit convex ring, a 4-fixed handle, a 5-compression spring, a 6-cheek shaft screw, a 7-movable handle and an 8-step channel.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.

Examples. The tension limiting device of the surgical forceps comprises a fixed handle 4, a movable handle 7 rotationally connected with the fixed handle 4, a forceps head assembly 1 provided with the front end of the fixed handle 4, a limiting pull rod 3 penetrating through the fixed handle 4 and a compression spring 5 sleeved on the limiting pull rod 3, wherein the limiting pull rod 3 is provided with a plurality of elastic members; the front end of the limiting pull rod 3 is connected with the clamp head assembly 1, and the rear end of the limiting pull rod is clamped in the movable handle 7 through a limiting convex ball; the fixed handle 4 is internally provided with a step channel 8 with a large front part and a small rear part, the limit pull rod 3 is arranged in the step channel 8 in a penetrating way, and the front part of the limit pull rod 3 is provided with a limit convex ring 31 corresponding to the front section of the step channel 8; the diameter of the limiting convex ring 31 is larger than that of the rear section of the step channel 8 and smaller than that of the front section of the step channel 8.

The specification and the position of the step channel 8 are set according to the actual condition of the surgical forceps, so that the forceps head assembly 1 is in a safe opening range when the limiting convex ring 31 is abutted with the step channel 8.

The front section of the fixed handle 4 is provided with a detachable nut 2; the movable handle 7 is movably connected with the fixed handle 4 through a cheek shaft screw 6.

The rear section of the fixed handle 4 is provided with a spring limiting groove, the front end of the compression spring 5 is arranged in the spring limiting groove, and the rear end of the compression spring is abutted with the movable handle 7.

Working principle:

when the movable handle 7 is closed, the clamp head assembly 1 is driven to be closed through the linkage of the limiting pull rod 3, and when the movable handle 7 is closed to a certain extent, the limiting convex ring 31 on the limiting pull rod 3 is locked by abutting against the step channel 8, so that the movable handle 7 cannot be continuously closed, the limiting pull rod 3 cannot be continuously pulled open, and the safety of the clamp head assembly 1 is effectively ensured.

Claims

1. The utility model provides a pincers pulling force stop device which characterized in that: comprises a fixed handle (4), a movable handle (7) rotationally connected with the fixed handle (4), a clamp head assembly (1) provided with the front end of the fixed handle (4), a limit pull rod (3) penetrating through the fixed handle (4) and a compression spring (5) sleeved on the limit pull rod (3); the front end of the limiting pull rod (3) is connected with the clamp head assembly (1), and the rear end of the limiting pull rod is clamped in the movable handle (7) through a limiting convex ball; a step channel (8) with a large front part and a small rear part is arranged in the fixed handle (4), the limiting pull rod (3) is penetrated in the step channel (8), and a limiting convex ring (31) corresponding to the front section of the step channel (8) is arranged at the front part of the limiting pull rod (3); the diameter of the limiting convex ring (31) is larger than that of the rear section of the step channel (8) and smaller than that of the front section of the step channel (8).

2. A forceps pull limiting device according to claim 1, wherein: the front section of the fixed handle (4) is provided with a detachable nut (2); the movable handle (7) is movably connected with the fixed handle (4) through a cheek shaft screw (6).

3. A forceps pull limiting device according to claim 1, wherein: the rear section of the fixed handle (4) is provided with a spring limiting groove, the front end of the compression spring (5) is arranged in the spring limiting groove, and the rear end of the compression spring is in butt joint with the movable handle (7).