Body Position Sensors for PSG Systems – Triaxial Accelerometer Technology

Body position sensors for sleep diagnostics. Accurate sleep posture monitoring is essential for understanding the correlation between patient position and respiratory events in sleep apnea. Our sensors use triaxial accelerometer technology to precisely detect and output five standard sleep postures: supine, prone, left lateral, right lateral, and sitting.

Why Body Position Monitoring Matters in Sleep Studies

Positional sleep apnea is common, with many patients experiencing more frequent events when sleeping on their back. A reliable sleep position sensor allows clinicians to:

• Identify position-dependent OSA and tailor treatment recommendations
• Correlate apnea and hypopnea events with patient posture
• Track treatment efficacy, especially for positional therapy devices
• Enhance the comprehensiveness of PSG and HSAT reports

How Our Body Position Sensors Work

Each sensor incorporates a high-sensitivity MEMS accelerometer that detects orientation relative to gravity. The sensor translates the patient’s position into a unique, stable DC voltage level for each of the five postures. This straightforward analog output interfaces directly with your PSG system’s auxiliary input, requiring no additional software or calibration.
Body Position Sensors by Compatible System
For Philips Alice Systems
Body position sensor for Alice 6: Features a dedicated keyhole connector designed specifically for the Alice 6 auxiliary input. Ensures secure, plug-and-play connection and stable signal transmission throughout overnight studies.
For Compumedics Grael Systems
Body position sensor for Grael PSG: Engineered with a proprietary connector for seamless integration with Grael systems. Provides accurate 5-posture detection with minimal signal drift.
For Natus & Cadwell Systems
Body position sensor for Natus Xltek and Cadwell Easy III: Features a standard 1.5mm DIN connector for direct compatibility with these widely used PSG platforms. Reliable, plug-and-play solution for adding posture monitoring.
For Nihon Kohden Systems
Body position sensor for PSG-1100: Equipped with a 2.5mm audio jack for direct connection to the Nihon Kohden PSG-1100 auxiliary input. Specifically configured to meet the system’s input specifications.
Key Features of Our Body Position Sensors

• Triaxial accelerometer technology for precise posture detection
• Five-posture output: supine, prone, left lateral, right lateral, sitting
• Unique DC voltage level for each posture, compatible with standard PSG software
• System-specific connectors: keyhole, proprietary, 1.5mm DIN, or 2.5mm audio jack
• Minimal signal drift for all-night reliability
• Compact, lightweight design for patient comfort

How to Choose the Right Body Position Sensor

When selecting a sleep position sensor for your lab, consider:

1. Your PSG system: The sensor must have the correct connector for your amplifier (keyhole for Alice 6, proprietary for Grael, 1.5mm DIN for Natus/Cadwell, or 2.5mm audio for PSG-1100).
2. Integration needs: All our sensors provide direct DC voltage output, compatible with standard PSG auxiliary inputs.
3. Patient comfort: Our compact sensors can be easily integrated with respiratory effort belts for a comfortable, all-in-one setup.   
4. Need help finding the replacement position sensor for Alice 6 or another system? Contact our team for expert guidance. We’ll help you select the right sensor based on your equipment and clinical needs.