Laparoscopic cutting stapler

Abstract

The invention discloses a laparoscopic cutting stapler, which comprises an executive assembly, a jaw direction adjustment mechanism and a stapler driving part; the jaw direction adjustment mechanism comprises a joint knob, a main turntable, a shrapnel assembly, a slave turntable, a ring gear, and a transmission shaft , pin shaft, swivel head, adjusting sleeve and 2 joint push rods; the main turntable is provided with a main boss; the slave turntable is provided with a mounting position, a slave boss and a pin hole; the shrapnel assembly includes two elastically set snaps The ring gear is fixed in the rotating head, and its inner ring is provided with evenly distributed teeth; when the joint knob is turned to adjust the jaws to turn, the shrapnel assembly is snapped into the ring gear in time, limiting the rotation from the turntable, effectively ensuring the operation For the problem of jaw swing back during the process, it is easier and labor-saving to operate the adjustment mechanism of the jaw direction; the sound from the beating of the shrapnel makes the jaw direction adjustment mechanism of the stapler have dual reminder effects of feeling and sound.

Description

technical field [0001] The invention relates to a surgical medical instrument, in particular to a laparoscopic cutting stapler capable of bidirectional locking in multiple positions, belonging 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 a...

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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