Surgical Scalpel with Sliding Sheath and Interlocking Stops
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Solution Overview
Problem
Surgical scalpels pose a significant risk of accidental cuts and infections to healthcare workers due to the lack of effective mechanisms for safely covering and disposing of the blades, leading to potential exposure during handling and disposal.
Innovation Solution
A surgical safety scalpel design featuring a longitudinally moveable blade sheath that securely locks onto the handle, allowing for one-handed operation to cover the blade without risk of accidental exposure, and requires deliberate force to remove, ensuring safety during use and disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a retractable external sheath is used to cover the scalpel blade, then the safety against accidental cuts is improved, but the operation becomes complex and requires two hands
Solution Approach 1:
The sheath is divided into two independent parts: a fixed portion attached to the handle and a movable portion that slides over the blade. This segmentation allows the sheath to be operated with one hand while maintaining secure coverage of the blade, resolving the contradiction between safety and ease of operation.
Solution Approach 2:
A spring mechanism acts as an intermediary between the user's finger and the sheath, providing automatic return motion. When the user pushes the sheath forward to cover the blade, the spring automatically returns the sheath to its retracted position, enabling single-handed operation while maintaining safety.
2Object-affected harmful factors
If complex mechanical mechanisms are added to move the sheath, then the safety coverage is improved, but the device complexity increases and mechanical failure becomes more likely
Solution Approach 1:
The complex mechanical mechanisms are extracted and replaced with a simple sliding action and spring return system. The sheath moves along the handle with minimal resistance, and the spring provides the return motion, eliminating the need for complex actuators and reducing mechanical failure risk.
Solution Approach 2:
The spring mechanism provides self-service by automatically returning the sheath to its retracted position without requiring additional mechanical components or complex control systems. This self-returning feature reduces device complexity while maintaining effective blade coverage.
3Ease of operation
If the blade sheath is made detachable for disposal, then the ease of blade removal is improved, but the risk of accidental exposure and infection spread increases
Solution Approach 1:
The sheath is pre-designed with a detachable configuration that allows controlled separation from the handle. The detachment mechanism is prepared in advance with proper alignment features, enabling safe blade removal without accidental exposure while facilitating proper disposal to prevent infection spread.
Data Source
AI summary
A surgical safety scalpel having a handle, a blade fixed at one end of the handle, and a sheath slidably and inseparably attached to the handle. The sheath slides lengthways along the handle alternating between a blocking position in which the sheath covers the blade, and a ready position in which the blade is exposed and the sheath forms part of the grip. An aperture in the sheath and two stoppers on the handle form an interlocking mechanism for maintaining the sheath in the blocking position, and a third stopper on the handle prevents the sheath from sliding off the handle in the ready position.