Surgical Knife Safety Handle with Movable Guard
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Solution Overview
Problem
Existing surgical scalpels with movable guards are cumbersome, difficult to use, and may cause unwanted shielding or exposure of the blade, leading to accidental cuts or nicks during handling and disposal.
Innovation Solution
A surgical knife safety handle device with a solid handle body and a movable guard that can be easily extended or retracted using a one-handed push/pull mechanism, providing a secure and intuitive operation without rotational or transverse motion, and featuring a snap-on assembly for easy disassembly and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable guard is added to shield the blade, then safety against accidental cuts is improved, but device complexity increases
Solution Approach 1:
The surgical knife is divided into distinct functional segments: a fixed handle body, a movable guard component, and a blade. The guard is further segmented with a gripping portion and a shielding portion that can move independently. This segmentation allows the guard to be added as a separate safety component without redesigning the entire knife structure, thus improving safety while controlling complexity.
Solution Approach 2:
The guard acts as an intermediary component between the user's hand and the blade. It provides a safe interface for handling the knife during non-use periods while allowing direct access to the blade when needed. The guard mediates the interaction between the user and the dangerous cutting edge, enabling safety without requiring complex interlocking mechanisms.
2Ease of operation
If the guard is made movable for easy operation, then ease of operation is improved, but reliability decreases due to unwanted movement
Solution Approach 1:
The guard is designed with dynamic characteristics that allow it to be easily movable during intentional operation but stable during unintentional movement. A spring mechanism provides continuous contact force between the guard and the blade holder, ensuring the guard returns to its shielded position after use while requiring minimal force to activate. This dynamic design enables easy one-handed operation while maintaining reliable blade positioning through controlled mobility.
3Reliability
If the guard completely covers the blade when retracted, then safety is improved, but the handle outline is distorted making it difficult to hold
Solution Approach 1:
The guard is designed with non-uniform geometry where different portions serve different functions. The gripping portion has a contour designed for comfortable finger placement and thumb operation, while the shielding portion extends to fully cover the blade when retracted. This local differentiation allows the guard to provide complete blade protection without distorting the ergonomic characteristics of the handle grip area.
Data Source
AI summary
A surgical knife safety handle device comprises a handle body being essentially solid. A movable guard engages with the body for longitudinal movement between an extended position and a retracted position. The guard encloses a knife blade. The operation is an intuitive push/pull to extend or retract guard. The guard is formed of a clear material with a low profile that does not interfere with vision in use. The guard includes a leaf spring. The spring has a hemispherical protrusion on its underside that engages with a slot on the handle for positive engagement and an audible “click” when it seats.