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A multisensor catheter for the intravascular measurement of blood parameters is presented. The catheter contains a set of silicon chips that can process the signals of a large nunber of sensors. This includes on-chip transducers and signal conditioning as well as signal amplification and analog-to-digital conversion. U O S techniques for sensor fabrication allow a monolithic realization. The chip size enables a catheter of 2 mm in diamete? to include two l d n a for infusion purposes.

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