Linear Stapler Safety Block and Raised Stopper Mechanism
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Solution Overview
Problem
Existing linear surgical staplers lack a reliable safety mechanism to prevent accidental cutting without stapling, particularly when the staple cartridge is unloaded, which can lead to serious consequences during surgical operations.
Innovation Solution
A linear surgical stapler with a safety mechanism featuring a lower safety block with a raised stopper that blocks the movement path of the firing piece when the staple cartridge is unloaded, and a flexible beam that keeps the stopper pressed against the upper jaw, along with an upper safety block and a cutter advancer with a step that resets against the upper safety block, ensuring the firing piece cannot move unless the staple cartridge is loaded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety mechanism is added to prevent accidental cutting, then safety is improved, but device complexity increases
Solution Approach 1:
The safety mechanism is divided into separate functional components: a lower safety block with a raised stopper that blocks the firing piece path, an upper safety block that limits cutter advancer movement, and a flexible beam providing restoring force. This segmentation allows each component to perform its specific safety function independently, making the overall system manageable despite the added complexity.
Solution Approach 2:
The flexible beam acts as an intermediary element that provides a restoring force to the raised stopper, ensuring it returns to the blocking position after the staple cartridge is loaded. This intermediary component simplifies the safety mechanism by using elastic restoration rather than requiring active control systems.
2Reliability
If a raised stopper is used to block the firing piece, then safety is improved, but manufacturing complexity increases
Solution Approach 1:
The safety blocks and flexible beam are designed as simple, inexpensive components that can be easily manufactured and replaced if necessary. The raised stopper is a simple protrusion on the lower safety block, and the flexible beam is a simple elastic element, both of which can be produced using standard manufacturing processes without requiring complex tooling or assembly.
3Ease of operation
If the staple cartridge protrusion pushes away the raised stopper, then the firing piece can move, but the structure becomes more complex
Solution Approach 1:
The system is designed so that loading the staple cartridge automatically performs the action of pushing away the raised stopper through its protrusion. This preliminary action prepares the safety mechanism for operation without requiring additional steps or controls from the user, maintaining ease of operation while implementing the safety interlock.
Solution Approach 2:
The staple cartridge's own protrusion serves the dual function of both loading the cartridge and actuating the safety mechanism by pushing away the raised stopper. This self-service design eliminates the need for separate actuation mechanisms, reducing overall system complexity while maintaining operational simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The safety mechanism prevents accidental cutting by restricting the movement of the firing piece when the staple cartridge is unloaded, ensuring safe operation and reliable stapling, with a simple and easy-to-manufacture design that enhances safety and usability.
Implementation Method 1
a flexible beam that keeps the stopper pressed against the upper jaw
Data Source
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AI summary
A linear stitching and cutting apparatus comprising: upper and lower jaws, a staple cartridge arranged at a distal end of the lower jaw, a firing piece movably arranged relative to the staple cartridge, and a cutter advancer having a cutter. The firing piece and the cutter advancer are kept relatively still. The linear stitching and cutting apparatus also includes a lower safety block. The lower safety block includes a raised stopper. When the linear stitching and cutting apparatus is in an initial state without loading the staple cartridge, at least part of the raised stopper is located on the movement path of the firing piece. The safety mechanism of the linear stitching and cutting apparatus is structurally simple, convenient to process, also safe and reliable.