See P.4 of the second link. Blood pressure is measured by listening to the blood flow and noting the pressure at which the flow stops and then releasing the pressure and listening for the flow to start again. So you need a cuff and controllable air pumps. . . The electronics is the easy bit.
Frank
hi, i have seen P.4 of the second link, its good, but its abit complicated for me to build it because i dunno which component model to use, eg like air pump, sensor,air valve, etc.
do u think its possible for me to build my blood pressure device by just using (MPS-2000-006GR DIP Pressure Sensor) in the first link provided by @ckshivaram. however, i got no idea on how to design it. im thinking tat it's just connect with some resistor and then connect the output to the PIC and analys the pressure in PC. i really need some help in designing this device.
i would prefer the 1st link because it looks simple and measure blood pressure with touching i guess. And 2nd also good, but its look complication for me.
my knowledge is limited, tats why i need a detail schematic diagram which indicate and guide me in buiding this device.
thanks!:grin:
---------- Post added at 09:25 ---------- Previous post was at 08:58 ----------
@chuckey, That is not quite how it is done usually. The most common method is to inflate the cuff until all flow stops, then deflate it slowly until the first pulse sounds are heard. That is the systolic pressure. Finally, the cuff is deflated further until the pulse sound disappears. That is the diastolic pressure. One can estimate one or both measures during inflation, but that is not standard procedure in the US and can give different results. Let me add that in fact, most people experienced in taking blood pressure can get a reasonable estimate (e.g., normal, high, very high, or low) of systolic pressure just by feeling the pulse at the wrist. High diastolic pressure can also be estimated that way too.
@signup, A cuff is by far the most common method of non-invasively measuring blood pressure. My question is whether you just want to measure blood pressure or do you want to do the research needed to try to invent a method that doesn't use a cuff? If it is the former, use a cuff.
If it is the latter, you could look at ways to apply a controlled pressure to various pulse points (e.g., the wrist or ankle). Then correlate that pressure for the appearance and disappearance of a pulse with simultaneous, conventional blood pressure measurements. For example, with a little pressure, you can see the blood pulsing in a fingernail bed. The appearance and disappearance of the pulsations would be your indicator -- or use IR to detect beginning and ending of pulsatile of blood flow
Here is a lead I found on a non-cuff instrument that might give you some other ideas:
John
@chuckey, That is not quite how it is done usually. The most common method is to inflate the cuff until all flow stops, then deflate it slowly until the first pulse sounds are heard. That is the systolic pressure. Finally, the cuff is deflated further until the pulse sound disappears. That is the diastolic pressure. One can estimate one or both measures during inflation, but that is not standard procedure in the US and can give different results. Let me add that in fact, most people experienced in taking blood pressure can get a reasonable estimate (e.g., normal, high, very high, or low) of systolic pressure just by feeling the pulse at the wrist. High diastolic pressure can also be estimated that way too.
@signup, A cuff is by far the most common method of non-invasively measuring blood pressure. My question is whether you just want to measure blood pressure or do you want to do the research needed to try to invent a method that doesn't use a cuff? If it is the former, use a cuff.
If it is the latter, you could look at ways to apply a controlled pressure to various pulse points (e.g., the wrist or ankle). Then correlate that pressure for the appearance and disappearance of a pulse with simultaneous, conventional blood pressure measurements. For example, with a little pressure, you can see the blood pulsing in a fingernail bed. The appearance and disappearance of the pulsations would be your indicator -- or use IR to detect beginning and ending of pulsatile of blood flow
Here is a lead I found on a non-cuff instrument that might give you some other ideas:
John
Hello jpanhalt,
My answer is, actually i just want to take blood pressure reading/signal and connect it to PIC, then connect it PC, after PC receives the signal/data, my program will interpret whether im underpressure/normal/highpressure. If its highpressure, my program will display im highpressure and my health condition is bad....
my problem is, i dont know which method is easier for me to construct
(index finger reading blood pressure? OR by implemeting the cuff method?)
the purpose i do research about finger blood pressure is because i guess it would be much easy to contruct compared to cuff method.
actually, it doesnt matter for me by using which method, i need a full guide and detail of the circuit design and if possible with program of PIC.
i need some schematic diagram which clearly drawn with details and component model used.
thanks!