A simply constructed system for mean blood flow measurement

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Device Calibration

Background:

• Accurate calibration of blood flow measuring equipment and cardiac bypass pumps is crucial.
• Existing single vessel timed collection systems present challenges including slow determinations, frothing, and surface instability.
• Filling vessels from the bottom can introduce inaccurate back pressure, affecting flow measurements.

Purpose of the Study:

• To present a semi-automated timed collection system that addresses the limitations of conventional methods.
• To provide a more accurate and reproducible means for calibrating blood flow devices.
• To enable direct measurement of coronary sinus flow in surgical preparations.

Main Methods:

• Development of a semi-automated timed collection system.
• Utilizing the system for calibration of electromagnetic flowmeters.
• Employing the system for calibration of heart bypass pumps.
• Direct measurement of coronary sinus flow in canine models.

Main Results:

• The semi-automated system overcomes disadvantages of previous methods, allowing rapid, accurate flow determinations.
• Successful calibration of electromagnetic flowmeters and heart bypass pumps achieved with 1% reproducibility or better.
• The system was effectively used for direct measurement of coronary sinus flow in canine preparations.

Conclusions:

• The presented semi-automated timed collection system offers a significant improvement for calibrating critical cardiovascular equipment.
• The enhanced accuracy and reproducibility facilitate more reliable performance of blood flow measurement devices and pumps.
• This system provides a valuable tool for both device calibration and direct physiological flow measurement in research settings.