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Method of deflection corrected tonometry with phantom vessel experiments.

G Drzewiecki1, G Krishna1, H Katta1

  • 1Department of Biomedical Engineering, Rutgers-the State University of New Jersey, New Brunswick, NJ, USA.

Computers in Biology and Medicine
|November 23, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to correct errors in continuous non-invasive blood pressure measurements using arterial tonometry. The technique reduces measurement inaccuracies caused by imprecise device positioning, simplifying operation.

Keywords:
Arterial tonometryBlood pressure measurementContinuous noninvasive blood pressure measurement (CNIBP)Force derived arterial pressure

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Physiological Monitoring

Background:

  • Continuous non-invasive blood pressure (CNIBP) monitoring is crucial for patient care.
  • Arterial tonometry offers CNIBP but requires precise operator skill and ideal vessel positioning for accuracy.
  • Deviations from optimal arterial wall applanation are a primary source of measurement error.

Purpose of the Study:

  • To develop and evaluate a method for correcting tonometry deflection errors in CNIBP measurement.
  • To reduce the reliance on highly skilled operators for accurate arterial pressure readings.
  • To maintain pressure accuracy despite less-than-ideal tonometer positioning.

Main Methods:

  • Derived a geometric model to calculate vessel contact area based on tonometer deflection.
  • Developed a formula to correct contact stress for variable vessel deflection, enabling pressure calculation.
  • Evaluated the model's accuracy using a phantom latex vessel with known internal pressures and varying deflections.

Main Results:

  • A model-derived formula accurately determined contact pressure corresponding to internal vessel pressure across various deflections.
  • Applying the deflection correction significantly reduced the average error in pressure measurements.
  • The variability of measurement error was also decreased, approaching accuracy levels of ideal tonometry.

Conclusions:

  • The developed modeling method effectively corrects tonometry deflection errors, improving CNIBP accuracy.
  • This correction method alleviates the need for precise position control, simplifying tonometer use.
  • The findings are expected to lower design requirements and enhance the practical application of arterial tonometry.