Importance

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Abstract

A sensor mechanism-equipped catheter is easy to produce, suitable for a diameter reduction, and achieves a high sensing precision. In a catheter, a sensor assembly has a pressure-receiving piston, a pressure-transmitting silicon gel or oil and a pressure sensor chip, and is fitted to a distal end of a catheter tube. The sensor assembly detects a pressure change. The sensor assembly further has an outer tube that carries the piston at a distal end side thereof, and an inner tube carrying the sensor chip an end side thereof. A space formed in the outer tube, between the piston and the sensor chip, is filled with the silicone gel or oil. A pressure barrier wall is provided for blocking flow of the silicone gel toward the catheter tube. The sensor chip is fixed in the sensor assembly by a joining member which divides an interior space of the sensor assembly into a distal end-side region and a base end-side region. The joining member may also serve as the pressure barrier wall.

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First Claim