A sensor is disclosed, for implantation within a blood vessel to monitor a substance in or property of blood. In one embodiment, the sensor detects nitric oxide or a nitric oxide metabolite. In another embodiment, other substances such as glutamate, aspartate, arginine, citrulline, acetylcholine, calcium,...http://www.google.co.uk/patents/US7769420?utm_source=gb-gplus-sharePatent US7769420 - Sensors for detecting substances indicative of stroke, ischemia, or myocardial infarction
