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A blood pressure sensor for long-term implantation.
E Bullister1, S Reich, P D'Entremont
1APEX Medical, Inc; and EDG, Inc., East Walpole, Massachusetts 02032, USA.
Artificial Organs
|June 14, 2001
Summary
A novel implantable blood pressure sensor for left ventricular assist devices (LVADs) shows accurate readings and long-term stability. This device minimizes thrombus formation, offering a promising advancement for heart failure management.
Area of Science:
- Biomedical Engineering
- Cardiovascular Devices
- Implantable Sensors
Background:
- Left ventricular assist devices (LVADs) are crucial for managing advanced heart failure.
- Accurate and stable blood pressure monitoring is essential for optimizing LVAD performance and patient outcomes.
- Existing pressure monitoring solutions may face challenges with biocompatibility and long-term stability in flow paths.
Purpose of the Study:
- To develop and evaluate an implantable flow-through blood pressure sensor prototype for integration with LVADs.
- To assess the sensor's accuracy, linearity, hysteresis, non-repeatability, and long-term stability.
- To compare the sensor's performance and biocompatibility against a commercial pressure catheter in an acute animal model.
Main Methods:
- A novel flow-through blood pressure sensor with a flat diaphragm integrated into a titanium tube was designed.
- The sensor's internal flow path geometry was optimized to prevent flow separation.
- Bench testing characterized sensor performance (nonlinearity, hysteresis, non-repeatability), and long-term drift studies were conducted.
- In vivo evaluation involved acute calf experiments comparing the sensor with Millar pressure catheters.
Main Results:
- Bench testing demonstrated excellent sensor performance with low nonlinearity (≤0.64 mm Hg), hysteresis (≤0.87 mm Hg), and non-repeatability (≤0.87 mm Hg).
- Projected annual drift rates were low, at 1.4 and 2.0 mm Hg.
- In vivo calf experiments showed comparable pressure tracings to Millar catheters, with no observed thrombus formation on the APEX sensor.
- The Millar catheter exhibited thrombus formation at the flow path entrance.
Conclusions:
- The developed implantable blood pressure sensor prototype is accurate and exhibits long-term stability for LVAD applications.
- The sensor's design minimizes flow separation and shows superior biocompatibility by preventing thrombus formation compared to existing methods.
- This technology holds significant potential for improving hemodynamic management and patient care in individuals with LVADs.