Stapler Handle Assembly with Sliding Lockout Mechanism
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Solution Overview
Problem
The existing circular stapler firing transmission mechanism has defects that negatively impact operator experience and can cause the stapler casing to crack if the handle is pressed vigorously, particularly due to the lockout mechanism's limitations.
Innovation Solution
A handle assembly with a first and second handle, where the first handle can be pressed regardless of the stapler's readiness, and the second handle is only actuated to fire the stapler, featuring a sliding slot mechanism and indicators that ensure smooth rotation without blocking, preventing accidental firing and reducing operator force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockout mechanism is added to prevent accidental firing, then safety is improved, but operator experience deteriorates and casing may crack under vigorous pressing
Solution Approach 1:
The handle assembly is segmented into a first handle for triggering and a second handle for firing, with a slider mechanism that can be in a first position (locked) or second position (unlocked). This segmentation allows the safety function to be separated from the firing action, improving operator experience while maintaining reliability.
Solution Approach 2:
The lockout mechanism transitions from a static blocked state to a dynamic selectable state through the slider. The slider can be manually positioned to either block or allow the connection between handles, providing adaptability that improves operator experience while maintaining safety when needed.
2Loss of information
If an indicator is added to show firing readiness, then information feedback is improved, but the indicator blocks handle rotation during normal operation
Solution Approach 1:
The indicator is nested within the handle assembly structure, specifically positioned to rotate with the second handle. This nesting allows the indicator to provide firing readiness information without occupying separate space that would block the first handle's rotation during normal operation.
Solution Approach 2:
The indicator is pre-configured to rotate in response to the position of the second handle, providing advance visual feedback about firing readiness before the actual firing action occurs. This preliminary indication allows operators to understand the system state without physical blocking.
3Productivity
If the first handle is always connected to the second handle, then firing response is improved, but accidental firing cannot be prevented
Solution Approach 1:
The slider acts as an intermediary element between the first handle and second handle. When in the first position, it blocks the transmission of motion, preventing accidental firing. When in the second position, it allows smooth transmission for rapid firing response. This intermediary provides conditional connectivity that resolves the contradiction.
Solution Approach 2:
The connection parameter between the two handles changes based on slider position. In the first position, the connection is blocked (parameter = disconnected). In the second position, the connection is enabled (parameter = connected). This parameter change allows the system to switch between safety mode and rapid response mode as needed.
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 sliding slot disposed on the first handle, a slider slidably disposed in the sliding slot, a second indicator and a first indicator connected to a first end of the second indicator; when the first indicator is rotated in a first direction, a second end of the second indicator is driven to rotate in the first direction and the slider is pushed to move from a first section of the sliding slot to a second section of the sliding slot; when the slider is pressed against the second handle due to rotation of the first handle in a second direction, the second handle is linked with the first handle and the second end of the second indicator is pushed by the slider to rotate in the second direction.