Patent ID: 7572229

Claim:
A probe for use in photoplethysmographic (PPG) measurement, comprising: a light source unit including a light source, the light source unit adapted to contact a predetermined site of an object and to emit light onto the predetermined site; a photodetector unit positioned facing the light source unit to receive the light emitted from the light source unit and transmitted through the object; a body having a space for receiving the object and in which the light source unit and the photodetector unit are positioned along a same vertical axis with respect to a surface of the body supporting the object; a pressure application unit coupled to the body for applying a pressure to the object via the light source unit, the pressure application unit being aligned in the same vertical axis above the light source unit; and a pressure application break button electrically connected to the probe for allowing the subject or an operator to cease the application of pressure by the pressure application unit.