Defibrillator Readiness Indicator Using Liquid Crystal Shutter
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Solution Overview
Problem
Existing defibrillator readiness indicators are suboptimal as they are not easily recognizable across all nationalities, lack fail-safety when power is lost, require power to function, and occupy excessive space on the device, failing to provide a clear and active indication of readiness for use.
Innovation Solution
A visual indicator using a liquid crystal shutter that overlays a graphic icon to indicate not-ready status and becomes transparent to show a check mark for ready status, with optional flashing, ensuring visibility and minimal space usage while being fail-safe and power-independent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a liquid crystal shutter is used to overlay a graphic icon for readiness indication, then the indicator becomes universally recognizable and space-efficient, but the indicator requires power to function and lacks fail-safety when power is lost
Solution Approach 1:
The patent inverts the traditional readiness indication approach by making the shutter transparent to indicate readiness and opaque to indicate un readiness. This inversion, combined with the fail-safe design, ensures that power loss automatically results in a transparent shutter displaying the checkmark, clearly indicating the device should not be used without proper power and testing.
Solution Approach 2:
The patent utilizes optical property changes of the liquid crystal shutter, transitioning between transparent and opaque states. This visual change provides universally recognizable indication without requiring complex color systems, achieving space efficiency while maintaining clear communication of device status.
2Use of energy by moving object
If a visual indicator uses a liquid crystal shutter that becomes transparent to show ready status, then power consumption is minimized, but the indicator is not visible when power is lost
Solution Approach 1:
The liquid crystal shutter serves itself by using the absence of power to automatically transition to the transparent state, displaying the checkmark without requiring additional power-consuming components. The system uses the power loss condition itself as the trigger for the visual indication, eliminating the need for separate backup power systems for the indicator.
3Ease of operation
If a readiness indicator provides clear and active indication with flashing feature, then user recognition is improved, but device complexity increases
Solution Approach 1:
The patent implements a flashing mode where the liquid crystal shutter alternates between transparent and opaque states to actively attract user attention and confirm readiness status. This periodic action provides clear, unambiguous indication without requiring complex display systems, multiple indicators, or sophisticated control circuits.
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
The solution provides a universally recognizable, fail-safe, and space-efficient visual indication of defibrillator readiness, ensuring quick user recognition and minimal power consumption, even in the absence of power, with an active flashing feature for added operability confirmation.
Implementation Method 1
A visual indicator includes a liquid crystal (LC) shutter which overlays a graphic icon
Data Source
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AI summary
A fail-safe visual indicator (62) for indicating the readiness status of a medical device is described. The visual indicator incorporates iconic status indications (67, 70) which are easier to understand for users of all nationalities and languages. The status indications are superimposed upon each other in order to reduce the space required on the medical device for the indicator.