| 摘要 |
Thin film polarographic gas sensors are described wherein the electrodes are deposited on a flexible substrate. A bilumen monopolar catheter-type sensor has a thin cathode layer (8) deposited on the wall of one lumen (4), the distal end of which is sealed by a polyurethane plug (10) such that only the outer edge surface of the cathode layer (8) is in contact with a dip-coated permeable membrane (14). The cathode layer (8) extends to the proximal end of the catheter (2) where electrical contact is made with a conductor wire (16) through electrically-conductive epoxy resin (18). When the sensor is employed umbilically or intravascularly, the second lumen (6) may be employed to withdraw samples from the patient or supply fluids thereto. The cathode layer (8) may be deposited on the catheter material in long lengths, which are then subsequently cut to the appropriate length for individual catheter-type sensors. |
