High risk infusions--accuracy compromised by changes in patient venous pressure

Area of Science:

• Biomedical Engineering
• Medical Device Technology
• Pharmacokinetics

Background:

• Intensive care necessitates precise administration of potent, short-half-life intravenous drugs.
• Reported flow anomalies in infusion systems include bolus flow, delayed start-up, and fluid reflux.
• Existing infusion pump designs may compromise accurate drug delivery.

Purpose of the Study:

• To develop a mathematical model for understanding infusion pump system dynamics.
• To identify key factors contributing to flow errors in intravenous drug administration.
• To aid in the design of more accurate infusion devices.

Main Methods:

• Introduction of a simple mathematical model for infusion pump systems.
• Analysis of system mechanical compliance as a factor in flow error.
• Verification of the model by predicting flow variations due to pump height changes.

Main Results:

• System mechanical compliance is identified as a significant contributor to infusion flow errors.
• The mathematical model accurately predicts flow variations caused by changes in pump height.
• Current syringe infusion devices are susceptible to errors from patient venous pressure fluctuations.

Conclusions:

• Accurate low-flow rate delivery necessitates the use of small-volume, rigid components.
• Mathematical modeling can enhance the development of precise infusion devices.
• Improvements are needed to mitigate errors caused by patient venous pressure in current designs.