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Implantable electrolyte conductance-based pressure sensing catheter, I. Modeling
Robert Tan1, Peter Schulam, Jacob J Schmidt
1Department of Bioengineering, University of California Los Angeles, Los Angeles, CA, 90095, USA.
Biomedical Microdevices
|July 23, 2013
Summary
This study introduces a novel, low-cost blood pressure sensor using an electrolyte-filled elastic tube. Changes in electrical resistance due to tube deformation accurately measure arterial blood pressure, avoiding common artifacts.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Sensor Technology
Background:
- Traditional arterial blood pressure monitoring relies on external equipment prone to sensing artifacts.
- Existing in situ sensors are often costly and difficult to miniaturize.
Purpose of the Study:
- To develop an alternative, cost-effective method for measuring arterial blood pressure.
- To create a sensor based on the electrical resistance changes in a deforming elastic tube.
Main Methods:
- Developed an analytical model for a fluid-filled elastic tube subjected to external pressure.
- Modeled the relationship between pressure-induced dimensional changes and electrical resistance.
- Investigated sensor performance based on material and dimensional parameters.
Main Results:
- The model predicts measurable changes in electrical resistance correlating with applied pressure.
- Fractional resistance change is predictable based on device design and material properties.
Conclusions:
- The proposed elastic tube sensor offers a promising, artifact-free approach to blood pressure measurement.
- This technology has the potential for lower-cost, miniaturized in situ blood pressure monitoring.
