Development of a Phantom to Modulate the Maternal and Fetal Pulse Curve for Pulse Oximetry Measurements

Weyrich, Steven; Sprenger, S.; Böttrich, Marcel; Schmidt, P. H.; Laqua, Daniel; Ley, Sebastian; Husar, Peter

doi:10.1515/bmt-2012-4204

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…In previous studies it was established that this silicone tube is useable to generate the desired dilation by adjusting the pressure above 90 kP a. [15].…”

Section: B Experimental Modelmentioning

confidence: 99%

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A phantom with pulsating artificial vessels for non-invasive fetal pulse oximetry

Laqua

Pollnow

Fischer

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Arterial oxygen saturation of the fetus is an important parameter for monitoring its physical condition. During labor and delivery the transabdominal non-invasive fetal pulse oximetry could minimize the risk for mother and fetus, compared to other existing invasive examination methods. In this contribution, we developed a physical-like phantom to investigate new sensor circuits and algorithms of a non-invasive diagnostic method for fetal pulse oximetry. Hence, the developed artificial vascular system consists of two independent tube systems representing the maternal and fetal vessel system. The arterial blood pressure is reproduced with a pre-pressure and an artificial vascular system. Each pulse wave can be reproduced, by digital control of a proportional valve, adjustable viscoelastic elements, and resistances. The measurements are performed by pressure transducers, optical sensor units, and a coplanar capacitive sensor. Transmission and reflection measurements have shown that the fetal and maternal pulse waves can be reproduced qualitatively. The measured light represents the transabdominal modulated signal on an abdomen of a pregnant woman.

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“…In previous studies it was established that this silicone tube is useable to generate the desired dilation by adjusting the pressure above 90 kP a. [15].…”

Section: B Experimental Modelmentioning

confidence: 99%

“…For example, it is possible to generate pulsatile waveforms with a roller pump and a stepping motor. Due to the mechanical properties and function, the measured pressure and flow waveforms are limited [15]. With a digital controlled piston pump arterial flow can be reproduced more accurately.…”

Section: Introductionmentioning

confidence: 99%

A phantom with pulsating artificial vessels for non-invasive fetal pulse oximetry

Laqua

Pollnow

Fischer

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

View full text Add to dashboard Cite

show abstract

FPGA controlled artificial vascular system

Laqua

Brieskorn

Koch

et al. 2015

Current Directions in Biomedical Engineering

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Monitoring the oxygen saturation of an unborn child is an invasive procedure, so far. Transabdominal fetal pulse oximetry is a promising method under research, used to estimate the oxygen saturation of a fetus noninvasively. Due to the nature of the method, the fetal information needs to be extracted from a mixed signal. To properly evaluate signal processing algorithms, a phantom modeling fetal and maternal blood circuits and tissue layers is necessary. This paper presents an improved hardware concept for an artificial vascular system, utilizing an FPGA based CompactRIO System from National Instruments. The experimental model to simulate the maternal and fetal blood pressure curve consists of two identical hydraulic circuits. Each of these circuits consists of a pre-pressure system and an artificial vascular system. Pulse curves are generated by proportional valves, separating these two systems. The dilation of the fetal and maternal artificial vessels in tissue substitutes is measured by transmissive and reflective photoplethysmography. The measurement results from the pressure sensors and the transmissive optical sensors are visualized to show the functionality of the pulse generating systems. The trigger frequency for the maternal valve was set to 1 per second, the fetal valve was actuated at 0.7 per second for validation. The reflective curve, capturing pulsations of the fetal and maternal circuit, was obtained with a high power LED (905 nm) as light source. The results show that the system generates pulse curves, similar to its physiological equivalent. Further, the acquired reflective optical signal is modulated by the alternating diameter of the tubes of both circuits, allowing for tests of signal processing algorithms.

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Development of a Phantom to Modulate the Maternal and Fetal Pulse Curve for Pulse Oximetry Measurements

Cited by 2 publications

References 7 publications

A phantom with pulsating artificial vessels for non-invasive fetal pulse oximetry

A phantom with pulsating artificial vessels for non-invasive fetal pulse oximetry

FPGA controlled artificial vascular system

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