MPXC12DT1

Sensors

2

Freescale Semiconductor

Pressure

Freescale Semiconductor's Bio-compatible Pressure

Sensors have 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: 10993-5:1999, 10993-10:2002, and 10993-

11:1993.

These sensors contain 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 MPXC12DT1 is a no-gel option.