Method and apparatus for measuring blood oxygen saturation
Patent 09065/TUB

The method uses electromagnetic radiation to determine oxygen saturation in the blood more accurately than conventional methods.

  1. very insensitive to movement influences
  2. artifact-free indication of oxygen saturation
  3. Measurement of transmitted or reflected radiation possible
Possible Applications

This innovative software-based method makes it possible to calculate an exact reconstruction of the plethysmographic signal for a change in blood volume and the correct values of oxygen saturation.


Pulse oximetry is a diagnostic method which allows continuous non-invasive measurement of the blood oxygen content. The method is based on the light absorption behaviour of hemoglobin, which depends on the oxygen content, and is implemented by measuring the light transmitted by the organ. In general, the problem arises that arterial pulsation and mechanical movement lead to movement artifacts that strongly impair an accurate determination of the blood oxygen content.

Technical Description

The invention requires a measuring device and a signal processing method to compensate motion artifacts in the determination of oxygen saturation and plethysmogram in pulse oximetry. To measure the oxygen saturation of the blood flowing in a peripheral part of the body, electromagnetic radiation is radiated into or through this part of the body in two different wavelength ranges. The reflected or transmitted radiation is then measured to form two measurement signals, which are evaluated using a software method that has also been developed and the oxygen saturation of the blood is determined.

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Ina Krüger

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+49 (0)30 314-75916

Technology Readiness Level

Experimental proof of concept

Property Rights

approved: DE, US

Patent Holder

Technische Universität Berlin

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