An implantable time of flight flow sensor

Author

Yu, Lawrence ; Kim, Brian J. ; Meng, Ellis

Author_Institution

Dept. of Biomed. Eng., Univ. of Southern California, Los Angeles, CA, USA

fYear

2015

fDate

18-22 Jan. 2015

Firstpage

620

Lastpage

623

Abstract

A micro time of flight (TOF) electrochemical impedance (EI) flow sensor μEIFS suitable for implantation and integration with a catheter was developed. The transducer utilizes two pairs of electrodes to monitor using EI measurement the passage of a gas bubble generated upstream. High precision measurement of bubble TOF (SD <; 6% of mean) was achieved over the velocity range 0.83-83 μm/s. The volumetric flow rate was inversely proportional (linearized, r² = 0.99) to time of flight. Biocompatible construction (only Parylene C and platinum), low power consumption, and low profile thin film format make the μEIFS ideally suited for chronic in vivo monitoring with immediate application in tracking flow within hydrocephalus shunts.

Keywords

bioMEMS; biomedical electrodes; biomedical electronics; biomedical telemetry; brain; bubbles; catheters; electrochemical sensors; flow sensors; haemodynamics; low-power electronics; materials preparation; microfluidics; microsensors; neurophysiology; organic-inorganic hybrid materials; patient monitoring; platinum; polymers; prosthetics; μEIFS implantation; μEIFS integration; EI measurement; Pt; biocompatible construction; catheter; chronic in vivo monitoring; electrode pair; gas bubble generation; gas bubble passage; high precision bubble TOF measurement; hydrocephalus shunt; immediate flow tracking application; implantable time of flight flow sensor; low power consumption; low profile thin film format; micro TOF EI flow sensor development; micro TOF electrochemical impedance flow sensor; parylene C-platinum construction; platinum construction; transducer; velocity 0.83 mum/s to 83 mum/s; velocity range; volumetric flow rate; Biomedical measurement; Electrodes; Fluid flow measurement; Impedance; Impedance measurement; Sensors; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on

Conference_Location

Estoril

Type

conf

DOI

10.1109/MEMSYS.2015.7051032

Filename

7051032