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SMT accelerometer targets implantable medical apps

Posted: 10 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:SMT acceleration sensors? implantable medical devices? 40366 SMT accelerometer?

Endevco's model 40366

Endevco Corp. has announced the latest addition to its miniature sensing product portfolio, the model 40366 SMT accelerometer. The variable capacitance, silicon MEMS device is claimed to be suitable for implantable medical device applications, such as rate responsive heart pacemakers and defibrillators.

"With patient health and well-being in the balance, manufacturers of implantable medical devices demand the highest levels of performance and reliability," said Jesse Bonfeld, Endevco's medical market segment manager. "Our new model 40366 is the latest addition to the Endevco family of miniature sensors for critical healthcare applications."

Hermetically sealed with a shear bond strength of 1kg, the model 40366 delivers repeatability of less than 0.035pF in an SMT footprint of only 2.05-by-2.90mm configured as a three-terminal half-bridge. Acceleration through the oblate axis causes one capacitor to increase in value as the other decreases, while air damping creates an inertial system that is over damped.

Additional features of the model 40366 include frequency response of 40Hz, linearity of less than 1 percent, transverse sensitivity of less than 1 percent, a 2g full scale for measurement of fractional-g accelerations in the presence of earth's gravity and over-range stops with provisions to eliminate electrostatic sticking when the accelerometer is over-ranged. The resulting design provides excellent stability, low hysteresis and ruggedness, said the company.

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