Blood Pressure Sensor

What smart watch is it exactly and what sensors is it provided with?

We are developing our own watch. We need to program it to send data to our cloud server. development platform is TI. Features

· Features AFE4400 for measuring pulse from veins in wrists

· MSP430F5528 MCU for holding algorithm and motion cancellation calibration data

· BLE module connection featuring TI's CC2541

· This design is tested and provides everything you need to complete your design including Schematics, Layout and Gerber files, and BOM

• and BOM

So you are developing a product that will be for sale, and you want some FREE engineering help???

We just had an articulate high school student come here and ask for some help with a project. He was forthright in his request for guidance.

It was/is a pleasure to help him.

You, on the other hand, want someone to do your work for you.

Good luck with that.

You need an instrument engineer to do the research for you. With some specific requirements.

Merry Christmas.

i prefer you make one for you, amplify it 1000x so that you'll be aware. Is it you or just the nature you? Merry Xmas!!!

Just make me sick

Something with an embedded Sphygmomanometer based on pressure or sound.

But why reinvent the wheel?

Should be without cuff for continuous monitoring and optical.

I have the feeling that you don't understand what you are trying to measure. In your post #5 you suggest measuring the pulse from a vein, when it should be from an artery.

Secondly, the non-invasive continuous blood pressure measurement technique you are aiming for is not particularly accurate and needs an ECG channel. The ECG trace requires 2 electrodes, which cannot both be at the wrist. The required measurement is of the pulse transit time, based on the time interval between the ECG R wave and the arrival of the pulse at the wrist. As discussed in this paper

http://somnomedics.eu/fileadmin/SOMNOmedics/Dokumente/article_Gesche_et_al_-_Continuous_BP_Measurement_by_using_the_PTT_Comparison_to_cuff_based_method.pdf

there are disparities of up to 20mmHg between the PTT and sphygmomanometric BP measurements.

Consult your witch doctor.

Which doctor is that?

Ask these guys....but you need a smartphone or tablet too.....

https://www.indiegogo.com/projects/infrav-no-blood-glucose-vital-signs-monitor-watch

http://www.technologyreview.com/news/524376/this-fitness-wristband-wants-to-play-doctor/

"An optical sensor on the wristband's back shines light onto your wrist and measures selective light absorption as a means of determining your heart rate, while an accelerometer measures the tiny body movements that result. Respiration and blood pressure signals are extracted from this data."

This is cool too....

http://www.wfs.org/aggregator/sources/4

I want one! Santa still knows where I live, and I have been (sort of ) a good boy, so please, please, please, Dear Santa, if you get CR4 there at the North Pole, can I have one?

You have the sensor, you have the MCU,...what's the problem? Why can't you code a routine to store in memory? It's up to you to set the interval and how many points you want to store, if you need more storage, add more memory, or add a fingernail sized 30 gigabyte serial memory card.

It may also not be much of a stretch to add an O2 saturation measure. If the little clamp can read it from a finger tip, it could likely get it from a wrist.

Speaking as someone who takes people's blood pressure all day long, do you even know what you are asking? Is this watch going to have a built in inflatable cuff? if not, then you aren't going to get very far in your quest.

How about a microphone and a "chirper" to measure signals, then find some way to correlate this to bp? At least you will have pulse rate, and maybe, just maybe there will be some sort of change in the temporal characteristics of the signal that correlates with bp. After you are done with that, you could add the things about oxygen % saturation, and blood glucose (non-intrusive).

If the acoustic method has no chance of working, then it is back to using an applied pressure, which means the "watch" needs a pretty substantial gas pump to inflate a wristband cuff, then listen for pulsations as the pressure is released. A tough assignment at best.

I don't think you are going to get very far with the microphone and chirper. Although the pulse can be felt when one applies pressure at the wrist, the actual movement at the skin without pressing is invisible. If your plan is to scan below the surface with ultrasound, that is not going to work unless you couple the transducer to the skin with gel.