title: A pharmacokinetic model of a tissue implantable insulin sensor.
abstract: While implantable sensors such as the continuous glucose monitoring system have been widely studied, both experimentally and mathematically, relatively little attention has been applied to the potential of insulin sensors. Such sensors can provide feedback control for insulin infusion systems and pumps and provide platforms for the monitoring of other biomarkers in vivo. In this work, the first pharmacokinetic model of an affinity sensor is developed for insulin operating subcutaneously in the limit of where mass transfer across biological membranes reaches a steady state. Using a physiological, compartmental model for glucose, insulin, and glucagon metabolism, the maximum sensor response and its delay time relative to plasma insulin concentration, are calculated based on sensor geometry, placement, and insulin binding parameters for a sensor localized within adipose tissue. A design relation is derived linking sensor dynamics to insulin time lag and placement within human tissue. The model should find utility in understanding dynamic insulin responses and forms the basis of model predictive control algorithms that incorporate sensor dynamics.
authors: Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
authors: Gili
authors: G
authors: Bisker
authors: Nicole M
authors: NM
authors: Iverson
authors: Jiyoung
authors: J
authors: Ahn
authors: Michael S
authors: MS
authors: Strano
mesh_terms: D015374:Biosensing Techniques; D004567:Electrodes, Implanted; D006801:Humans; D007328:Insulin / Q000032:analysis / Q000493:pharmacokinetics / Q000494:pharmacology; D008954:Models, Biological
chemical_list: D007328:Insulin
keywords: insulin sensors; single-walled carbon nanotubes