Optical Blood Volume Pulse Monitoring for Multi-Night Sleep Diagnosis

The patent extracts the essential function of sleep event detection from the complex polysomnography system by focusing solely on peripheral arterial tone monitoring. This isolation of the critical measurement function enables accurate sleep event detection without requiring the full array of EEG, EOG, EMG, and ECG sensors that characterize traditional PSG systems.

The patent replaces the mechanical and electrical complexity of polysomnography with optical measurement technology. By using photoplethysmography to monitor peripheral arterial tone, the system substitutes multiple mechanical sensors and complex wiring with a non-contact optical approach, maintaining measurement precision while dramatically reducing device complexity.

The patent implements self-service by enabling the monitoring system to automatically detect and analyze sleep events without requiring manual intervention. The peripheral arterial tone data is processed algorithmically to identify apnoeic events, snoring, and limb movements, allowing the system to serve itself in the analysis function that traditionally required sleep technicians.

The patent incorporates feedback mechanisms where the monitored peripheral arterial tone continuously provides information about sleep events, which are then automatically processed and fed back into the diagnostic system. This closed-loop approach enables automated real-time detection and classification of sleep events without manual analysis.

The patent inverts the traditional hospitalization model by enabling sleep diagnosis to be performed in the patient's home environment. Instead of bringing the patient to a controlled hospital setting, the system brings diagnostic capability to the patient's natural sleep environment, eliminating travel time and hospitalization requirements while maintaining measurement precision.

The patent enables preliminary action by allowing sleep monitoring to begin immediately in the patient's home without requiring prior hospitalization or extensive setup by healthcare professionals. The simplified apparatus can be deployed quickly and begin collecting data from the first night, eliminating the time loss associated with traditional PSG scheduling and setup.

The patent extracts only the essential component needed for sleep diagnosis - the optical sensor for peripheral arterial tone monitoring - from complex portable solutions. By removing unnecessary components such as multiple sensors, complex wiring, and heavy power supplies, the system achieves portability without being cumbersome.

The patent applies local quality by concentrating the monitoring function in a minimal, lightweight apparatus that can be easily worn on the finger. Rather than distributing multiple heavy components throughout the body, the system localizes the sensing function to a single small optical sensor at the distal digit, maximizing portability while maintaining diagnostic capability.

The patent adopts a disposable approach by using inexpensive optical sensors and single-use components for the portable monitoring apparatus. Rather than investing in expensive, reusable equipment that requires maintenance and calibration, the system uses affordable components that can be easily manufactured and discarded after use, significantly reducing manufacturing costs while maintaining portability.

The patent replaces expensive mechanical and electrical components with cost-effective optical technology. By using photoplethysmography with simple light-emitting diodes and photodetectors, the system eliminates the need for costly sensors, amplifiers, and signal processing hardware found in traditional portable solutions, achieving portability at a fraction of the cost.