Knob assembly and circular tube type stapler

By designing the knob assembly in the round tube stapler, using the clutch and spring mechanism, the failure mode is entered when the knob resistance reaches the preset value, solving the problem of excessive pressing of the tissue of the anvil assembly and the nail cartridge, realizing the protection of the tissue.

CN111329547BActive Publication Date: 2025-07-22TOUCHSTONE INTERNATIONAL MEDICAL SCIENCE CO LTD
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Patent Information

Application Number
CN201811553059.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2018-12-18
Publication Date
2025-07-22
Estimated Expiration
2038-12-18

AI Technical Summary

Technical Problem

When the existing round tube stapler rotates the knob, the tissue may be over-pressed between the anvil assembly and the staple cartridge, resulting in the tissue being crushed.

Method used

A knob assembly is designed, including a knob body, a clutch member and a knob back cover. By setting the first and second mating parts and a compression spring, when the resistance of the knob reaches a preset value, the clutch member cannot drive the knob body to rotate and enter the failure mode to prevent excessive pressing between the anvil assembly and the nail cartridge.

Benefits of technology

Effectively prevent tissue from being over-pressed, ensure that the gap between the anvil assembly of the stapler and the nail cartridge remains unchanged, and avoid tissue damage.

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Abstract

The present invention provides a knob assembly and a circular tube type stapler. The knob assembly includes a knob body, a clutch member, and a knob rear cover. A first mating portion is provided on the knob body. When the knob body rotates, it drives a lead screw to move axially along the stapler. A second mating portion is provided on the clutch member, and a compression spring is provided between the knob rear cover and the clutch member. In the present invention, the knob assembly is divided into a knob body and a clutch member. Before the resistance received by the knob body reaches a preset value, rotating the clutch member can drive the knob body to rotate together. The knob body can drive the anvil assembly to move axially along the stapler to approach the cartridge. After the resistance received by the knob reaches the preset value, the clutch member cannot drive the knob body to rotate. At this time, the knob assembly enters a failure mode, and the gap between the anvil assembly and the cartridge remains unchanged, without over-pressing the tissue.
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