Bed Exit Lighting Control for Low-Light Injury Prevention
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Solution Overview
Problem
Individuals supported on person-support apparatuses, such as hospital beds, often exit unsupervised and risk injury or equipment damage, especially in low-light conditions, as existing systems are inadequate in providing timely and appropriate lighting assistance.
Innovation Solution
A control system integrated with the person-support apparatus that detects movement and exit conditions, activating light sources to illuminate the area when a person exits the bed or exceeds a predefined movement threshold, using sensors to determine the need for lighting and adjust intensity based on ambient light levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a person exits the person-support apparatus unsupervised, then the person gains mobility freedom, but the risk of injury and equipment damage increases
Solution Approach 1:
The system performs preliminary detection of exit conditions and activates lighting before the person fully exits, preparing the environment in advance to prevent injury. The control system monitors for exit conditions and preemptively illuminates the area, ensuring safety measures are in place before the harmful situation occurs.
2Object-affected harmful factors
If lighting is provided continuously, then the person can see clearly and avoid injury, but energy consumption increases
Solution Approach 1:
Instead of continuous lighting, the system uses periodic action by activating lights only when exit conditions are detected. The control system monitors for specific conditions (person exiting, movement threshold exceeded) and triggers lighting temporarily, creating a periodic on-demand illumination pattern that reduces energy waste while maintaining safety.
Solution Approach 2:
The system changes the parameter of lighting activation from a constant state to a variable state based on detected conditions. The control system adjusts the lighting parameter (on/off) according to the detected exit condition, transitioning from continuous operation to conditional operation, thereby reducing energy consumption while maintaining injury prevention capability.
3Reliability
If a control system with sensors is added, then lighting can be activated timely to prevent injury, but device complexity increases
Solution Approach 1:
The control system is designed with multi-functionality, serving both as a safety monitor and a lighting controller. The same control unit that detects exit conditions also manages the lighting activation, combining multiple functions into a single system component, thereby reducing overall device complexity while maintaining reliable safety monitoring.
4Illumination intensity
If light sources are activated immediately upon exit detection, then the person can see the path clearly, but the lighting may be excessive in already well-lit conditions
Solution Approach 1:
The system incorporates feedback by continuously monitoring exit conditions and adjusting lighting activation accordingly. The control system receives feedback from sensors about the person's position and movement, and uses this feedback to determine whether lighting activation is necessary, preventing unnecessary energy consumption in conditions where visibility is already adequate.
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 system effectively reduces the risk of injury and equipment damage by providing timely and adjustable lighting, enhancing safety during exits from the person-support apparatus, especially in low-light environments.
Implementation Method 1
A control system integrated with the person-support apparatus that detects movement and exit conditions
Data Source
AI summary
A person-support apparatus includes a frame, a plurality of sensors, and a controller. The plurality of sensors are configured to determine a person's position relative to the frame. The controller is operatively coupled to the sensors. The controller determines whether an exit condition has been met. A light source is operatively coupled to the controller. The light source is activated by the controller when the controller determines that the exit condition has been met.