subdermal temperature sensor - short term
Hey all,
so I've been stalking this forum for a couple months now but haven't made an account until now, figured it was time to interact with you.
An idea has been floating around my head for a while, and I started to flesh it out just recently. Wanted some constructive criticism or just a 'that won't work', either is cool.
So high blood pressure runs in my family, and I was envisioning a subdermal device that sits on your lower forearm and just logs data, transmitting over Bluetooth LE for alerts (VERY similar to the circada, but ideally a good bit smaller). I'm not planning on actually implanting it anytime soon, just running prototypes (although if anyone knows of an implanter in the Pittsburgh area, please let me know). Due to the difficulty in actually measuring blood pressure, as a proof of concept i'd just like a temp sensor, reasonably accurate, to work over the course of a couple of weeks/ a month.
My vestigial parts list so far is:
ATtiny85 - possibly with a breakout board like the Trinket
an ultrathin 45 mAh battery (3*11*16) or similar
a temperature sensor (along the lines of the Sparkfun TMP36
Qi compliant wireless charging reciever, maybe like the one on DFrobot, or TI's interpretation (25.0 * 15.6 * 1.0 mm and 1mm radially respectivly)
an LED, just for basic interfacing.
The goal here is to just create a proof of concept, and maybe display it in my biomedical engineering class.
If anyone has suggestions, comments, gaping holes in my plan, please let me know
*// I'll discuss power issues and coatings in a later post //*
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Comments
thanks for saving me the redundancy of 2 temp sensors, that's super helpful.
rfid power delivery is a fantastic idea, but I don't understand how that could translate to always-on logging? wouldn't I just touch my phone to my arm to take a reading then? or am I missing something
essentially, my two (initial) prototypes will probably consist of an uLP module with purely RFID power and the onboard temp logger, and a larger one with a Bluetooth LE- enabled chip and some other charging solution. you say qi is overkill?
I'll order some parts, start playing with ideas.
Ideally, the run time would be ~1 day/12 hours with readings every minute or so, but less is fine, this is purely prototyping. Bluetooth would also be nice, just for the 'mainstream adoption' use case of presenting numbers and readings as more than just a text file, but I think for v. 0.1 not having a battery in the implant might take precedence.
do you have any links you could pass me in reference to the custom wound induction charging? I'm not super familiar with the concept (besides just 'put the coils together and voila')
thanks for the help :)
Side note, what kind of surgical skill/implanter/tattoo artist would it take to implant something like this ? (1.6*1*5mm)
:P