Method for continuous nondisturbing monitoring of blood pressure by magnetoelastic skin curvature sensor and ECG

Eugenijus Kaniusas*, Helmut Pfützner, Lars Mehnen, Jurgen Kosel, Juan Carlos Téllez-Blanco, Giedrius Varoneckas, Audrius Alonderis, Turgut Meydan, Manuel Vázquez, Michael Rohn, Alberto M. Merlo, Bernd Marquardt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

This paper concerns continuous nondisturbing estimation of blood pressure using mechanical plethysmography in connection with standard electrocardiography (ECG). The plethysmography is given by a novel magnetoelastic skin curvature sensor (SC-sensor) applied on the neck over the carotid artery. The sensor consists of a magnetoelastic bilayer partly enclosed by a coil. Bending the bilayer causes large changes of magnetic permeability which can be measured by the coil. The SC-sensor signal and the ECG signal are adaptively processed in order to estimate blood pressure according to a specifically established theoretical model. The model uses estimated vessel radius changes and pulse transit time as parameters. The results show cross correlation coefficients in the range 0.8 up to 0.9 between reference and estimated values of systolic blood pressure, diastolic blood pressure, and systolic/diastolic blood pressure change, whereas the estimation error was below 4 +/- 7 mmHg at rest and increased with the stress level. Limitations of the model applicability are given by a hysteretic behavior of both model parameters due to inert changes in artery stiffness. The SC-sensor and the ECG electrodes cause minimal inconvenience to the patient and offer an approach for a continuous nondisturbing monitoring of blood pressure changes, as being relevant for sleep monitoring or biomechanic feedback.

Original languageEnglish (US)
Pages (from-to)819-828
Number of pages10
JournalIEEE Sensors Journal
Volume6
Issue number3
DOIs
StatePublished - Jun 1 2006

Keywords

  • Blood pressure
  • Electrocardiography
  • Magnetoelastic amorphous ribbons
  • Mechanical plethysmography
  • Physiological sensors
  • Skin curvature sensor

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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