Annular Switch Actuation for Medical Instrument Handles
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Solution Overview
Problem
Video endoscopes require users to change their grip position or use both hands to actuate switches when rotating, making operation awkward due to changing switch positions relative to the user.
Innovation Solution
A medical instrument with a handle featuring an annular mechanical actuation unit that forms a peripheral grip surface, allowing switches to be actuated independently of the handle's rotational position, either as push or rotary switches with radial or rotational movement, and incorporating sensors for indirect actuation, enabling easy operation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If switches are arranged on the housing of the endoscope, then electrical control functions are provided, but the switch position changes with rotation requiring grip position changes or two-handed operation
Solution Approach 1:
The switch actuation surface is extended from a single point or flat surface to a three-dimensional annular shape that wraps around the handle. This allows the user to actuate the switch from any rotational position by applying force radially inward from any point on the annular grip surface, effectively adding a rotational dimension to the actuation interface and eliminating the need to adjust grip position when rotating the handle.
2Ease of manufacture
If switches are integrated into the handle, then compact design is achieved, but disassembly for cleaning or maintenance becomes complex
Solution Approach 1:
The switch assembly is segmented into modular components: the annular actuation unit with grip surface, the electrical switch mechanism, and the handle body. The actuation unit can be designed as a separate removable component that interfaces with the handle through simple mechanical or magnetic coupling, allowing easy detachment for cleaning or replacement without complex disassembly of the entire handle assembly.
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
Enhances user-friendliness and ergonomics by allowing switches to be actuated from any grip position, simplifying operation and maintenance, and allowing for easy cleaning by separating mechanical and electrical components.
Implementation Method 1
the mechanical actuating unit is hereby elastically mounted in the radial direction on an elastomer mounting or on spring elements, in order after an actuation of the switch, to be able to return again into a normal position
Implementation Method 2
via a mechanical coupling element or via a suitable sensor in the electrical part of the switch
Data Source
AI summary
A medical instrument includes a handle, on which at least one electric switch is arranged. The switch has an annular mechanical actuation unit whose outer side forms a grip surface running peripherally of the handle.