Jaw direction adjustment mechanism of laparoscopic cutting stapler

Abstract

The invention discloses a jaw direction adjustment mechanism of an endoscopic cutting stapler, which comprises a joint knob, a rotating head and a two-way adjusting assembly, and the two-way adjusting assembly is rotatably arranged in the rotating head; , an outer ring, a plurality of elastic bodies, a plurality of rollers, an inner star wheel, 2 pin shafts and 2 joint push rods; the bottom surface of the main turntable is provided with transmission pins, clamping feet and claws; There are positioning columns and matching bosses; the outer ring is located between the main turntable and the inner star wheel, the yoke surface of the inner hole of the outer ring is matched with the positioning column, and the claws, rollers and elastic bodies are arranged at intervals in the inner hole of the outer ring The yoke surface is between the mating bosses, and the elastic body makes the rollers always stick to the working surface of the inner star wheel, forming a two-way override clutch locking structure, which satisfies the two-way adjustment function of the two-way adjustment assembly for the jaw direction of the stapler, effectively It solves the problem of jaw swing back, and the operation is easier and labor-saving, so that the operator can feel the change of jaw adjustment in time.

Description

technical field [0001] The invention relates to a jaw direction adjustment mechanism of an endoscopic cutting stapler capable of bidirectional locking at multiple positions, and belongs to the technical field of medical instruments. Background technique [0002] The application number of the Chinese invention patent "Cutting Stapler Suitable for Minimally Invasive Surgery" is CN201310263622.9, and the following is briefly described as Patent 1, which discloses a surgical instrument. The rotating joint knob drives the joint base to rotate synchronously, and the 2 A pin shaft drives two joint push rods to slide back and forth, so that the two joint connecting plates inside the executive component drive the jaws to rotate and adjust around the hinge pins, and the top ball of the positioning bead is embedded in the joint seat for corresponding positioning under the action of the spring force. In the groove, the positioning beads block the joint seat by means of friction and do n...

AI Technical Summary

Problems solved by technology

Patent 1 uses two wave beads whose axes are parallel to the axis of the joint knob. The pressure spring inside it has small elasticity. Although the operation feels light, the disadvantage is that the jaws in the turning state will swing back when the thick tissue is fired, and the joint knob will jump gears. Unable to position and lock the jaws of the stapler, which is not reliable enough

Moreover, if simply increasing the elastic force of the pressure spring inside the ball, it will be a big risk that the welding strength of the upper and lower covers of the rotary head will be separated for a long time

Patent 2 uses a plurality of wave springs on the same axis as the joint knob to superimpose and press the upper and lower chainrings, and relies on the triangular tooth groove meshing. Although the greater the spring force, the less likely it is to prevent the jaws from swinging back, the disadvantage is that the triangular The meshing area of ​​the tooth groove is large, the friction resistance is large, and the required operating force is also large, and the force of the wave spring pressing the upper tooth plate is directly felt by the operator, so the greater the wave spring pressing force, the more laborious it is to operate the joint knob

In view of the fact that the hand feeling of the surgeon operating the instrument is biased and difficult to quantify, its force value tends to be small, while the spring force value of the above-mentioned mechanism to ensure that the jaws do not swing back tends to be large, which is obviously a prominent contradiction.

c. Institutions are unable to prevent reverse delivery of the movement

The above-mentioned patent 1 uses a spherical positioning wave bead and the triangular cogging used in patent 2 does not have unidirectional movement. When the spring force is small or fails, it cannot effectively prevent the jaws from swinging back or preventing them from reversing. Drive the joint knob to rotate and jump gear

d. In view of the diameter of the top bead of the wave bead in patent 1 and the width of the alveolar distribution on the end face of patent 2, in order to ensure the effectiveness of the mechanism, the gear indexing of instrument adjustment is limited by the structure, and the flexibility of the jaws of the stapler is limited. Restricted, only 2-3 symmetrical gears can be controlled to adjust the movement

In the use of surgeons for endoscopic minimally invasive surgery, the operating space is narrow, and the jaws of the stapler are limited to 2-3 positions for gear adjustment, which limits the convenience of operation. Moreover, the jaws of the stapler are Larger spans of adjustment run the risk of causing unknown damage to the tissue

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