Flexible polymer sensors for in vivo intravascular shear stress analysis

Hongyu Yu, Lisong Ai, Mahsa Rouhanizadeh, Darhsin Patel, Eun Sok Kim, Tzung K. Hsiai

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Hemodynamic forces, specifically fluid shear stress, play an important role in the focal nature of arterial plaque formation known as atherosclerosis. We hereby developed biocompatible and flexible intravascular microelectromechanical systems sensor to measure real-time shear stress in the aortas of New Zealand White (NZW) rabbits. Titanium (Ti) and platinum (Pt) were deposited on silicon wafers and patterned to form the sensing elements. The polymer, parylene C, provided insulation to the electrode leads and flexibility to the sensors. Based on heat transfer principle, the heat dissipation from the sensors to the blood flow altered the resistance of the sensing elements, from which shear stress was calibrated. The resistance of the sensing element was measured at approximately 1.0 kω, and the temperature coefficient of resistance was at approximately 0.16%/°C. The individual sensors were packaged to the catheter for intravascular deployment in the aortas of NZW rabbits (n=5). The sensor was capable of resolving spatial- and time-varying components of shear stress in the abdominal aorta. Computational fluid dynamic code based on non-Newtonian fluid properties showed comparable results within an acceptable range of experimental errors (±5) for the maximal and minimal values in shear stress during one cardiac cycle. Therefore, we demonstrated the capability of biocompatible sensors for real-time shear stress measurement in vivo with a potential to advance the understanding between the blood flow and vascular disease.

Original languageEnglish (US)
Pages (from-to)1178-1186
Number of pages9
JournalJournal of Microelectromechanical Systems
Volume17
Issue number5
DOIs
StatePublished - 2008

Fingerprint

Stress analysis
Shear stress
Sensors
Polymers
Blood
Fluids
Catheters
Stress measurement
Hemodynamics
Heat losses
Silicon wafers
MEMS
Insulation
Platinum
Computational fluid dynamics
Titanium
Heat transfer
Electrodes
Temperature

Keywords

  • Microelectromechanical systems (MEMS) sensors
  • Polymer
  • Rabbit arterial circulation
  • Shear stress

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

Cite this

Flexible polymer sensors for in vivo intravascular shear stress analysis. / Yu, Hongyu; Ai, Lisong; Rouhanizadeh, Mahsa; Patel, Darhsin; Kim, Eun Sok; Hsiai, Tzung K.

In: Journal of Microelectromechanical Systems, Vol. 17, No. 5, 2008, p. 1178-1186.

Research output: Contribution to journalArticle

Yu, H, Ai, L, Rouhanizadeh, M, Patel, D, Kim, ES & Hsiai, TK 2008, 'Flexible polymer sensors for in vivo intravascular shear stress analysis', Journal of Microelectromechanical Systems, vol. 17, no. 5, pp. 1178-1186. https://doi.org/10.1109/JMEMS.2008.927749
Yu, Hongyu ; Ai, Lisong ; Rouhanizadeh, Mahsa ; Patel, Darhsin ; Kim, Eun Sok ; Hsiai, Tzung K. / Flexible polymer sensors for in vivo intravascular shear stress analysis. In: Journal of Microelectromechanical Systems. 2008 ; Vol. 17, No. 5. pp. 1178-1186.
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