Closed-Loop Intravenous Drug Administration Using Photoplethysmography.

Area of Science:

• Biomedical Engineering
• Pharmacokinetics
• Medical Devices

Background:

• Clinical oncology drug delivery often lacks real-time monitoring of plasma concentration, leading to interpatient variability and suboptimal treatment outcomes.
• Interpatient variability in drug concentration can result in severe toxicity or ineffective treatments.

Purpose of the Study:

• To develop and evaluate a closed-loop, optically-based injection control system for precise intravenous drug delivery in preclinical settings.
• To integrate a pulse-photoplethysmograph with a real-time controller to manage injection rates based on measured plasma concentrations.

Main Methods:

• Development of a closed-loop injection system incorporating a pulse-photoplethysmograph for real-time monitoring of injected agent concentration.
• Utilizing a proportional-derivative (PD) controller to dynamically adjust injection rates.
• Employing a pharmacokinetic model, derived from Bayesian statistics, as the target function for the controller.

Main Results:

• The system successfully measured the concentration of an injected agent in circulating blood.
• A controlled set of eight injections demonstrated a 74.8% reduction in variance from the target injection phase concentration profile.
• The developed system achieved precise control over the injection rate in real-time.

Conclusions:

• The optically-based, closed-loop injection system offers a significant improvement in controlling intravenous drug delivery accuracy.
• This technology has the potential to mitigate toxicity and improve treatment efficacy by addressing interpatient variability in drug concentrations.
• The system represents a promising advancement for preclinical drug delivery applications, paving the way for more personalized and effective treatments.