Whatever happened to blood pressure sensing underpants?

Calvin Klein's for the
older generation?

Blood-pressure-sensing underpants?  This is a older piece from the New Scientist website.  Worth reading again though - I wonder if they are in development yet?  I will keep my eye out.

Blood pressure is not hard to measure, but the necessary equipment for clinically accurate measurements - a cuff, a pump, and stethoscope or electronics - is bulky and heavy.


However, researchers have recently found that a person's "pulse wave velocity" is closely linked to blood pressure. This is the rate at which the pulse pressure wave passes through the blood circulatory system.


Sensors sewn into the waistband of a person's underpants can measure the rate of this wave, consumer electronics company Philips has discovered, and could be used to calculate blood pressure for as long as the garment is worn.


Each sensor continually measures the electrical impedance of the tissue beneath it - a property that changes as the pulse wave passes by. A pair of such sensors can calculate the speed of the pulse wave by timing how long it takes to travel from one sensor to the other.


Once calibrated with a conventional blood-pressure reading, the electrodes can then give accurate blood-pressure readings, while the wearer enjoys the comfort of their own underpants.


Source: New Scientist 2008