Blood Pressure Project

[Newbiesss]

hi everybdoy,

Anyone can give me some ideas on how to create blood pressure with PIC.
Do I need to buy a cuff or is there any other way of measuring blood pressure with some kind of finger print pressure component?
Can someone show me some website/circuit diagram/code which is related to blood pressure project with the use of PIC. Pls give me some advises and solutions. I would be much appreciated.


thanks!

[arunb]

You need to get a sensor for doing this. Try searching on google.

Such sensors could be expensive.

thanks
a

[Ttelmah]

The standard measuring system is the same in all normal cases.

You measure the presence of the pulse. and increase the pressure in a cuff. By detecting the 'pump', and 'return' parts of the pulse, and when each is affected, you have a direct measure or the two components required.
You have to remember that the value depends on where the sensor is in height, relative to the heart.

It is possible to detect the pressure now, without a cuff, but not with a 'fingertip' device. The normal ones of these detect the pulse only, not the actual pressure involved (normally infrared sensors).

Without a cuff, you have to measure the actual blood flow velocity. The nearest to a fingertip device, was one developed at MIT a couple of years ago:-

<http://www.ideaconnection.com/new-inventions/measuring-blood-pressure-without-a-cuff-02342.html>

There are a few others in use, some quite specialised (head sensors!), but most require calibration using a cuff, for the patient involved, since the actual pressure depends on the elasticity of the blood vessel, it's diameter, and the flow velocity.

So not really suitable for basic testing.

Basic pulse sensors, are cheap now.

Best Wishes