Surgical cutting anastomat for stitching-then-cutting

Abstract

The invention discloses a surgical cutting anastomat for stitching-then-cutting. The surgical cutting anastomat has stable transmission, has no abrupt force upon percussion and has great percussion experience. A driving mechanism of the surgical cutting anastomat comprises a center rod capable of sliding back and forth; a first rack part is arranged on the center rod; the driving mechanism has a gear set and a push rod capable of sliding back and forth; the push rod is provided with a second rack part; the first and second rack parts are arranged on the same side of a gear or the gear set; the driving mechanism has a nail hitting state and a cutting state; when the driving mechanism is at the nail hitting state, the first and second rack parts are respectively engaged with the gear or the gear set to enable the push rod to slide with the center rod and further to drive a nail pushing member to push a stitching nail out of a nail cabin shell; a cutter is disposed in the nail cabin shell; and when the driving mechanism is at a cutting state, the second rack part is separated from the gear or the gear set and allows the center rod to continuously slide to push the cutter out of the nail cabin shell.

Description

technical field [0001] The invention belongs to the field of medical instruments, in particular to a surgical cutting stapler which sutures first and then cuts. Background technique [0002] The surgical cutter and stapler is a surgical instrument that has been widely used in general surgery, thoracic surgery, gynecology, and pediatric surgery. This product adopts the principle of a stapler, and closes and sutures organs or incisions during surgery through linearly staggered sewing needles. Surgical cutting stapler has the characteristics of neat suturing, reliable suture fastness, good hemostatic effect and good blood supply. But traditional surgical cutting and stapler sutures and cuts synchronously, and in actual operation, the cutter cuts off the tissue before the staples suture the tissue. In the case of the cut tissue and the vertical direction of the cut tissue being strong, it is easy to occur the medical accident that the tissue is cut off and is pulled away from ...

AI Technical Summary

Problems solved by technology

However, the key component that can realize suturing first and then cutting is an L-shaped chute formed by connecting the second chute and the third chute. This structure is simple and stable, but this structure cannot In the process, with the change of the position of the four-bar mechanism of the crank slider and the central rod in the L-shaped chute that pushes the push rod, the ratio of the thrust force of the central rod to the force of the push rod also changes non-curvilinearly. When the central rod pushes the four-bar Mechanism-driven staple forming process has force mutation point

When the push rod pushes the nail pusher to realize the forming of the staple, the position near the maximum deformation stress of the staple is also the position where the driving force of the L-shaped chute is the most laborious. At the most laborious point, the firing force changes greatly, and there is a force mutation point in the transmission process.

In addition, because the L-shaped groove is a sliding friction, the initial friction of the sliding friction is relatively large, and there is a sudden change in the initial firing force, which makes the firing experience poor when using this design.

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