Scalpel Locking Slide Mechanism for Safe Blade Exchange
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Solution Overview
Problem
Existing scalpels require manual force to mount or dismount the blade, posing a risk of injury and complicating cleaning, especially after surgical use when the blade is contaminated.
Innovation Solution
A scalpel design featuring a safety slide that fixes the blade on the handle without manual force exertion, allowing for easy installation and removal, and a cleaning position with reduced grip strength to facilitate thorough cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking mechanism is added to fix the blade without manual force, then safety and ease of operation improve, but device complexity increases
Solution Approach 1:
The locking slide is designed to be displaceable between a locking position (where it encompasses the handle and fixes the blade) and a cleaning position (where it moves away to allow cleaning access). This dynamic movement allows the same component to serve dual purposes: securing the blade during use and allowing cleaning when repositioned.
Solution Approach 2:
The locking slide serves multiple functions: it locks the blade to the handle during surgery, it can be displaced to allow cleaning of the handle, and its presence on the handle provides structural support. This multi-functionality reduces the need for additional separate components.
2Reliability
If the locking slide completely surrounds the handle, then blade fixation reliability improves, but cleanability worsens due to blocked access
Solution Approach 1:
The locking slide transitions from a static surrounding structure to a dynamic component that can be displaced. In the cleaning position, it moves away from the handle, creating access pathways for cleaning fluids and tools to reach all surfaces of the handle, including areas that would otherwise be blocked.
3Device complexity
If manual force is applied to the blade for mounting/dismounting, then device complexity is reduced, but safety worsens due to risk of injury
Solution Approach 1:
The locking slide acts as an intermediary mechanism between the user and the blade. Instead of the user directly manipulating the blade with their hands (which risks injury), they manipulate the locking slide, which then secures or releases the blade. This intermediate component protects the user from direct contact with the sharp blade edge during attachment and detachment operations.
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 safe and efficient blade exchange without manual force on the blade, ensuring proper cleanability and reducing the risk of injury during handling.
Implementation Method 1
a locking slide (4) that is displaceable in a longitudinal direction relative to the handle and at least partially encompasses the handle, wherein the locking slide places the tool directly and springily against the handle in a fixing position and fixes it on the handle and releases it in a cleaning position
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
The medical hand-held instrument (1) has a preferably single-piece handle (2) that has a handle-side positioning element (6), preferably a positioning protrusion, on the distal end section of the handle, a replaceable tool, preferably a blade (3), that is arranged on the handle (2) and has a second positioning element (7), preferably a positioning recess, into which the handle-side positioning element (6) engages in a substantially accurately fitting manner, and a securing slide (4) that can be moved relative to the handle (2) in a longitudinal direction thereof and at least partly surrounds the handle (2), wherein the securing slide (4) presses the blade (3) against the tool (3) directly and in a spring-elastic manner and fixes the blade on the handle (2) in a fixing position and releases same in a cleaning position.