title: A GENERIC PACKAGING TECHNIQUE USING FLUIDIC ISOLATION FOR LOW-DRIFT IMPLANTABLE PRESSURE SENSORS.
abstract: This paper reports on a generic packaging method for reducing drift in implantable pressure sensors. The described technique uses fluidic isolation by encasing the pressure sensor in a liquid-filled medical-grade polyurethane balloon; thus, isolating it from surrounding aqueous environment that is the major source of baseline drift.In-vitrotests using commercial micromachined piezoresistive pressure sensors show an average baseline drift of 0.006 cmH2O/day (0.13 mmHg/month) for over 100 days of saline soak test, as compared to 0.101 cmH2O/day (2.23 mmHg/month) for a non-fluidic-isolated one soaked for 18 days. To our knowledge, this is the lowest reported drift for an implantable pressure sensor.
authors.affiliation: Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kim
authors.affiliation: Indiana University School of Medicine, Indianapolis, IN, USA.
authors.forename: C R
authors.initials: CR
authors.lastname: Powell
authors.affiliation: Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
authors.forename: B
authors.initials: B
authors.lastname: Ziaie
keywords: Baseline-drift; Implantable Sensor; Pressure Sensor