An ultraminiature MEMS pressure sensor with high sensitivity for measurement of intramuscular pressure (IMP) in patients with neuromuscular diseases

A. S. Sezen, R. Rajamani, D. Morrow, K. R. Kaufman, B. K. Gilbert

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

An ultraminiature micropressure sensor to accurately measure intramuscular pressure has been developed. The MEMS sensor is fabricated through surface micromachining and consists of a capacitive array of eight 150 μm diameter sensing membranes connected in parallel. The membranes have been vacuum-sealed via a subsequent deposition and patterning batch microfabrication step. A deep reactive ion etcher (DRIE) based postfabrication self-release has been utilized to fabricate individual devices. Each device has an outline that incorporates specially designed "anchor" structures that are utilized to attach on the muscle tissue during measurements to minimize the effect of muscle contractions on sensor readings. Electrical isolation of the wire bonds and bonding pads has been accomplished by utilizing glob-topping technique. The fabricated sensor performance has been experimentally validated inside a pressure chamber. The current sensors have 0.2 mm Hg pressure resolution in the ±19 mm Hg dynamic range with negligible hysteresis and show a flat frequency response in the 0-5.5 Hz experimental test range.

Original languageEnglish (US)
Article number031006
JournalJournal of Medical Devices, Transactions of the ASME
Volume3
Issue number3
DOIs
StatePublished - Sep 1 2009

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Keywords

  • High sensitivity capacitive sensing
  • Intramuscular pressure
  • MEMS pressure sensor

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Biomedical Engineering

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