MPXC2011DT1

Sensors

2

Freescale Semiconductor

Pressure

Freescale Semiconductor's MPXC2011DT1/

MPXC2012DT1 Pressure Sensor has been designed for

medical usage by combining the performance of Freescale

Semiconductor's shear stress pressure sensor design and

the use of biomedically approved materials. Materials with a

proven history in medical situations have been chosen to

provide a sensor that can be used with confidence in

applications, such as invasive blood pressure monitoring. It

can be sterilized using ethylene oxide. The portions of the

pressure sensor that are required to be biomedically

approved are the rigid housing and the gel coating.

The rigid housing is molded from a white, medical grade

polysulfone that has passed extensive biological testing

including: tissue culture test, rabbit implant, hemolysis,

intracutaneous test in rabbits, and system toxicity, USP.

The MPXC2011DT1 contains a silicone dielectric gel

which covers the silicon piezoresistive sensing element. The

gel is a nontoxic, nonallergenic elastomer system which

meets all USP XX Biological Testing Class V requirements.

The properties of the gel allow it to transmit pressure

uniformly to the diaphragm surface, while isolating the

internal electrical connections from the corrosive effects of

fluids, such as saline solution. The gel provides electrical

isolation sufficient to withstand defibrillation testing, as

specified in the proposed Association for the Advancement of

Medical Instrumentation (AAMI) Standard for blood pressure

transducers. A biomedically approved opaque filler in the gel

prevents bright operating room lights from affecting the

performance of the sensor.

The MPXC2012DT1 is a no-gel option.