A Batch-Patterned Self-Expanding Biliary Stent with Conformal Magnetic PDMS Layer and Topologically-Matched Wireless Magnetoelastic Sensor

Author

Green, Scott R. ; Gianchandani, Yogesh B.

Author_Institution

Univ. of Michigan, Ann Arbor, MI

fYear

2009

fDate

25-29 Jan. 2009

Firstpage

212

Lastpage

215

Abstract

This paper presents a system for wirelessly monitoring the accumulation of sludge within biliary stents. The system comprises a sensor and biasing permanent magnet layer that conform to the meshed topology and tubular curvature of a biliary stent. The sensors have an active area of 7.5 mm times 29 mm and a mass of 9.1 mg. Annealing the sensor at 375degC results in reducing the required biasing magnetic field from 6 Oe to 2 Oe. The integrated system shows a 38% decrease in resonant frequency (from 61.6 kHz to 38.2 kHz) after an applied mass load of 20.9 mg, or 2.3times the mass of the sensor. The system architecture allows the mechanical properties of the stent to be maintained while adding important monitoring capabilities to the implanted device.

Keywords

annealing; batch processing (industrial); biomedical materials; biosensors; magnetoelastic effects; permanent magnets; polymers; wireless sensor networks; annealing; batch patterning; magnetic PDMS layer; meshed topology; permanent magnet layer; self expanding biliary stent; sludge; temperature 375 degC; tubular curvature; wireless magnetoelastic sensor; wireless monitoring; Annealing; Magnetic sensors; Mechanical factors; Mechanical sensors; Monitoring; Permanent magnets; Resonant frequency; Sensor systems; Topology; Wireless sensor networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Micro Electro Mechanical Systems, 2009. MEMS 2009. IEEE 22nd International Conference on

Conference_Location

Sorrento

ISSN

1084-6999

Print_ISBN

978-1-4244-2977-6

Electronic_ISBN

1084-6999

Type

conf

DOI

10.1109/MEMSYS.2009.4805356

Filename

4805356