Stapler Handle Assembly Lockout Mechanism
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Solution Overview
Problem
The existing circular stapler's firing transmission mechanism, including a lockout mechanism, can lead to operator discomfort and risk of the casing being cracked if pressed vigorously, and does not allow for clear determination of readiness for firing.
Innovation Solution
A handle assembly with a first handle that can be moved regardless of firing readiness and a second handle that only fires the stapler when in a linked state, utilizing an indicator and elastic portion to ensure the stapler is ready before firing, preventing accidental firing and casing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockout mechanism is added to prevent accidental firing, then safety is improved, but operator comfort deteriorates and the casing may be cracked if pressed vigorously
Solution Approach 1:
The handle assembly is divided into a first handle and a second handle with independent functions. The first handle controls the locking mechanism while the second handle controls the firing mechanism. This segmentation allows the locking function to be implemented without interfering with the firing operation, eliminating the problem of casing cracking while maintaining safety through the interlock between the two handles.
2Reliability
If a lockout mechanism is added to prevent accidental firing, then safety is improved, but the device complexity increases
Solution Approach 1:
The first handle serves multiple functions: it controls the locking mechanism, indicates the ready state through its position, and enables the firing sequence. The second handle is dedicated to firing control. This multi-functionality approach implements a comprehensive safety lockout system without requiring separate components for each safety function, thereby limiting the increase in device complexity.
3Strength
If the handle is made rigid to prevent cracking, then structural strength is improved, but the ease of operation deteriorates
Solution Approach 1:
The handle assembly incorporates dynamic elements including springs that provide resilient biasing forces and allow controlled movement. The first handle can move between locked and unlocked positions with spring assistance, and the second handle can rotate to fire the stapler only when properly positioned. This dynamic design allows the structure to be sufficiently rigid to prevent cracking while remaining easy to operate through spring-assisted movement and controlled rotation.
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
Enables the stapler to be safely and easily operated by allowing the first handle to be pressed without firing when not ready, ensuring the stapler is prepared before firing, thus enhancing operator experience and preventing casing damage.
Implementation Method 1
an elastic portion (3), movable between a first state and a second state
Data Source
AI summary
A handle assembly and a stapler including the same are provided. The handle assembly includes a first handle and a second handle having an un-linked state and a linked state. When the first handle and the second handle are in the un-linked state, and the first handle is rotated in a first direction, the second handle is not rotated, thereby to fire the stapler. When the first handle is in the linked state, and the first handle is rotated in the first direction, the second handle is actuated to rotate in the first direction to fire the stapler. During operation, no matter the stapler is ready to be fired or not, the first handle can be pressed to move by the doctor. However, when the stapler is not ready to be fired, the second handle is not actuated by the first handle, thereby will not fire the stapler.