A GENERIC PACKAGING TECHNIQUE USING FLUIDIC ISOLATION FOR LOW-DRIFT IMPLANTABLE PRESSURE SENSORS

A Kim; C R Powell; B Ziaie

doi:10.1109/TRANSDUCERS.2015.7180964

A GENERIC PACKAGING TECHNIQUE USING FLUIDIC ISOLATION FOR LOW-DRIFT IMPLANTABLE PRESSURE SENSORS

Int Solid State Sens Actuators Microsyst Conf. 2015 Jun:2015:476-479. doi: 10.1109/TRANSDUCERS.2015.7180964. Epub 2015 Aug 6.

Authors

A Kim¹, C R Powell², B Ziaie¹

Affiliations

¹ Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
² Indiana University School of Medicine, Indianapolis, IN, USA.

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-vitro tests 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.

Keywords: Baseline-drift; Implantable Sensor; Pressure Sensor.

Abstract

Grants and funding