Stapler Handle Assembly Slider Mechanism for Safe Firing
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Solution Overview
Problem
The existing circular staplers have a lockout mechanism that negatively impacts the operator's experience and can cause the casing to crack if the handle is pressed vigorously, and there is no clear indication of whether the stapler is ready to be fired.
Innovation Solution
A handle assembly with a first handle and a second handle, where the first handle can be pressed regardless of the stapler's readiness, but only the second handle can fire the stapler when ready, using a slider mechanism and indicator to ensure proper firing and prevent casing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockout mechanism is added to prevent accidental firing, then the safety and reliability are improved, but the ease of operation deteriorates and the casing may crack if the handle is pressed vigorously
Solution Approach 1:
The handle is divided into a first handle and a second handle, with the first handle serving as a pressure-sensitive trigger and the second handle serving as a rotational actuator. This segmentation allows the system to distinguish between accidental pressure (first handle only) and intentional firing (both handles engaged), thereby maintaining safety while improving operational ease.
Solution Approach 2:
A slider mechanism acts as an intermediary between the first handle and the second handle. The slider translates the rotational motion of the second handle into linear motion that engages the first handle, creating a mechanical interlock that prevents firing unless both handles are properly positioned, thus preventing casing damage while ensuring safe operation.
2Reliability
If a lockout mechanism is added to prevent accidental firing, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The locking and unlocking functions are merged into a single rotational motion of the second handle. As the second handle rotates, it simultaneously controls the engagement of the slider with the first handle, eliminating the need for separate locking mechanisms and reducing overall structural complexity while maintaining safety.
3Ease of operation
If no indicator is provided to show firing readiness, then the device complexity is reduced, but the ease of operation deteriorates as operators cannot intuitively determine if the stapler is ready to be fired
Solution Approach 1:
The handle assembly serves itself by using the relative positioning and engagement state of the first and second handles as the indicator of firing readiness. When the slider engages the first handle through rotational motion of the second handle, the system automatically provides tactile feedback indicating readiness to fire, eliminating the need for separate visual indicators.
Data Source
AI summary
A handle assembly and a stapler including the same are provided. The handle assembly includes a first handle, a second handle, a slot provided in the second handle and a slider slidably located in the slot. When the slider is in the first section of the slot, the first handle and the second handle are not linked; when the slider is in the second section of the slot, the first handle is linked to the second handle and actuates the second handle to move from an insurance position to a firing position. Therefore, only the movement of the second handle can fire the stapler. No matter whether the stapler is ready to be fired or not, the first handle can be pressed by the doctor, while the stapler cannot be fired when the stapler is not ready to be fired.