| 摘要 |
<p>PURPOSE:To enable accurate detection of a pressure by arranging a flexible electric lead extending in a direction as should be through a flexible tube connected to first and second pressure sensors. CONSTITUTION:A pair of openings 2a and 2b facing each other is made on a side circumferential surface closer to a tip of a flexible tube 1 of a catheter. A sensor base 3 is arranged and fixed with a tip sealing material 6. Then, for example, when the tip of the catheter 1 makes an oscillatory vibration in a direction connecting the openings 2a and 2b, changes in acceleration and opening pressure as caused by the vibration work on one pressure sensor 8a at the same time in a direction (positive) to raise a detection level and on another pressure sensor 8b in a direction (negative) to lower the detection level. Thus, level changing portions due to the vibration are canceled therebetween and an output level of an addition amplifier 31 is as indicated by a pressure in the perimeter of the tip of the catheter 1 without effect of vibration.</p> |
