Introduction
The VenoScreen® is a non-invasive, automated, and compact device designed for venous and arterial vascular diagnostics using Light-Reflection-Rheography (LRR) and Photo-Plethysmography (PPG). It is intuitive, self-calibrating, and time-efficient.

Measuring Methods
Light-Reflection-Rheography (LRR / D-PPG): This method measures venous pump volume and refilling time after a muscle pump test to assess venous valve function and muscle pump efficiency. It uses non-visible infrared light on the lower legs to reflect changes in venous blood volume.
Photo-Plethysmography (PPG): This method measures arterial pulse waves in fingers and toes to diagnose peripheral circulatory disturbances. It evaluates changes in infrared light absorption due to arterial pulsation.

Device Configuration
The VenoScreen® is a USB-driven device operated via a computer or laptop with installed measurement software. The software controls examinations, evaluates results, and includes a patient database. The device is configurable with optional LRR and/or PPG modules.

Technical Data
Light-Reflection-Rheography (LRR / D-PPG):

• Channels: 2
• Wavelength: 950 nm
• Frequency range: 0 – 10 Hz
• Accuracy: ± 1 s (refilling time)
• Application: calf

Photo-Plethysmography (PPG):

• Channels: 2
• Wavelength: 900 nm
• Frequency range: 0.2 – 25 Hz
• Accuracy: ± 1% (blood volume change)
• Application: fingers, toes

General Information

• Power supply: USB driven device
• Dimensions: 93 x 34 x 153 mm
• Weight: approx. 210 g

Classification and Standards

• Device class (EU): class IIa
• Insulation class: II, type BF, 4 kV
• Standards: EN 60 601-1, EN 60 601-1-2
• Notified body: CE 0197