Medical Switching Device with Capacitive Detection for Fault Safety
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Solution Overview
Problem
Medical apparatuses face challenges in preventing unintentional operation and detecting faults in switching devices, particularly due to spatial separation of electro-mechanical switches, which can lead to difficulty in operation and risk of simultaneous damage from mechanical issues or liquid exposure.
Innovation Solution
A switching device with at least one first switching member and one second switching member based on different principles, where the second member includes a detection space for an operating object, allowing for ergonomic operation while providing fault safety through a combination of electro-mechanical and proximity switching principles, including a capacitive sensor for error detection and recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two electro-mechanical switches are spatially separated to prevent unintentional operation, then safety is improved, but ease of operation deteriorates when high operating force is required
Solution Approach 1:
The patent combines two previously separate switches into a single integrated switching device with a common actuator. The first and second switching members are mechanically coupled through a shared actuating mechanism, allowing both switching functions to be performed by a single hand motion. This merging maintains safety through the dual-switching-principle design while dramatically improving ease of operation.
Solution Approach 2:
The patent implements a nested structure where the second switching member is positioned within the detection space of the first switching member, and both are integrated into a single compact housing. The actuator mechanism is nested within the switching members, creating a space-efficient design that accommodates multiple switching functions in a reduced spatial footprint.
2Ease of manufacture
If two switches of similar type with similar switching principles are used, then ease of manufacture is improved, but reliability deteriorates due to risk of simultaneous damage from mechanical issues or liquid exposure
Solution Approach 1:
The patent applies different switching principles to the first and second switching members - the first uses an electro-mechanical principle while the second uses a capacitive sensing principle. This differentiation in local quality ensures that a mechanical fault or liquid exposure affecting one switching principle will not necessarily affect the other, thereby improving fault safety while maintaining manufacturing feasibility through the use of standard component types.
Solution Approach 2:
The switching device employs a composite architecture combining two fundamentally different switching technologies (electro-mechanical and capacitive) within a single integrated unit. This composite approach ensures that faults affecting one principle do not propagate to the other, providing inherent fault tolerance while allowing manufacturing using established processes for each switching type.
3Device complexity
If a fault in a switch is not detected immediately when released, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The patent incorporates a feedback mechanism where the control unit continuously monitors the state of both switching members and compares their outputs. When a fault condition is detected (such as both switches remaining closed when they should open), the system immediately provides feedback through an error output signal, enabling real-time fault detection without significantly increasing device complexity.
Solution Approach 2:
The patent implements preliminary detection capability where the control unit is pre-configured to monitor for fault conditions and immediately detect them when they occur. The system is designed with built-in fault detection logic that activates as soon as a fault condition arises, eliminating delays in fault identification while maintaining relatively simple device architecture.
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 ergonomic and safe operation of medical apparatuses by preventing unintended switching and immediately detecting faults, ensuring reliable performance even in challenging environments like those with high electrical radiation.
Implementation Method 1
the second switching member includes a detection space in which a presence of an operating object is detected
Data Source
AI summary
In some aspects, a switching device for a medical apparatus includes a first switching member adapted to select an assigned operating function of the medical apparatus; and a second switching member adapted to permit the selecting of the assigned operating function of the first switching member. The second switching member is adapted such that it has a detection space in which it detects a presence of an operating object; and the first switching member is arranged in the detection space of the second switching member.