Light Therapy System Melanopic Exposure Control
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Solution Overview
Problem
Current light therapy systems for patients in clinical settings, such as ICUs, lack the ability to create customized light therapy programs based on specific target melanopic luminous exposure, which is essential for effectively managing sleep disturbances and reducing delirium, and they do not adequately consider the biological impact of color temperature on circadian rhythms.
Innovation Solution
A light therapy system with a controller that adjusts illuminance and color temperature over time to deliver a targeted melanopic luminous exposure, using melanopic weighting factors to ensure accurate dosage, and includes features like eye status and presence sensors to optimize light delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current light therapy systems are used, then basic light therapy can be provided, but customized light therapy programs based on target melanopic luminous exposure cannot be created
Solution Approach 1:
The system enables customization by allowing dynamic adjustment of key parameters including illuminance levels, color temperature, and treatment duration. The controller calculates and delivers targeted melanopic luminous exposure by modifying these parameters according to patient-specific requirements, thereby achieving adaptability without requiring complete system redesign.
Solution Approach 2:
The lighting assembly operates dynamically by varying illuminance and color temperature over time according to a generated control schedule. This dynamic operation allows the system to adapt to different patient needs and delivery preferences while maintaining the core functionality of light therapy, thus improving versatility without proportionally increasing complexity.
2Reliability
If color temperature is not considered in light therapy, then simpler light delivery can be achieved, but biological impact on circadian rhythms is not adequately addressed
Solution Approach 1:
The system explicitly incorporates color temperature as a controllable parameter alongside illuminance. The controller calculates the melanopic luminous exposure by considering both parameters, ensuring that the biological impact on circadian rhythms is accurately addressed. This parameter change approach allows for reliable therapeutic effectiveness while maintaining manageable control complexity through automated calculations.
3Productivity
If manual creation of light therapy schedules is used, then system simplicity is maintained, but efficiency in management and delivery is reduced
Solution Approach 1:
The system performs self-service by automatically generating control schedules based on input parameters such as target melanopic luminous exposure, delivery preferences, and patient characteristics. The controller autonomously calculates illuminance levels, color temperature variations, and treatment timing without requiring manual schedule creation, thereby significantly improving productivity while keeping automation complexity manageable through algorithmic approaches.
Solution Approach 2:
The system performs preliminary calculations and schedule generation before actual light therapy delivery. The controller pre-computes the control schedule based on patient-specific parameters and delivery preferences, allowing for efficient and customized therapy delivery. This preliminary action eliminates the need for manual schedule creation during the treatment process, improving productivity without requiring complex real-time decision-making systems.
Data Source
AI summary
A light therapy system (12) for administering a controllable melanopic luminous exposure includes a lighting assembly (16) for producing a light output (68) having a configurable illuminance and color temperature. Based on a received target melanopic luminous exposure a controller (24) of the system constructs a suitable control schedule (71) for controlling parameter levels of the lighting assembly over time such that in total over a defined treatment period (78), the indicated target melanopic luminous exposure is delivered. In constructing the control schedule, the relative melanopic sensitivity of humans to light of different color temperatures is taken into account. The color temperature of the administered light is accordingly controlled such that after adjusting for color, the delivered luminous exposure conforms to the input exposure target.