| 摘要 |
<p>A thin, lightweight optical source/receiver unit (12) adapted for application to the human forehead, for use in a cerebral oximeter, has a source of electromagnetic radiation of selected wavelengths (36) (e.g., light in the near infrared range) at a first position and a pair of sensors located at particular and differing distances from the source. The source may comprise light-emitting diodes (36a-36b) and the detectors may comprise photosensors (32, 34), all of which are preferably mounted on a small and flexible printed circuit strip (30). Electromagnetic shielding (42) substantially surrounds the source and detectors as well as the adjacent electrical conductors associated with each. The shielded printed circuit (30) and components are housed within layers of thin flexible material, of which the layer that contacts the patient preferably comprises soft, light-absorbing open-celled foam material (26) which is transmissible by water vapor, to dissipate moisture at the patient-sensor interface.</p> |
