Medical diagnostic system

Hello community, I'm a new member and a new Arduino user. I have to develop a medical diagnostic system in the following 3 months and I have a general idea of how to do it. I'm going to explain what I want to do and I'd like you to give me some advices about my approach.

I'll have a heart rate monitor, a body temperature monitor and a blood pressure monitor connected to the Arduino (I haven't buy the arduino yet, maybe you can suggest a model based on my project). Having these data, I plan to have an ARM mini2440 with a friendly user interface, so the person using the device can choose the symptoms it feels. So, of course, the mini2440 must be connected to the arduino. Next I plan to have a libelium gprs shield to send all that information to a web server where I have the principal application, there I'll have a program that will process the info and give me a string with the medical diagnostic. I want to send back to the device that string and show it on the mini2440.

Basically this is all. What do you think about my approach? Is it possible to do all the things I wrote here? Thank you so much in advance, I'd appreciate any help you can give. Oh, and btw, sorry for any misspelling, I'm not a native speaker.

EM

You haven't said what function you intend the Aduino to perform.

Why bother with the Arduino? The Mini2440 already has 34 GPIO available.

Reading between the lines the Arduino is collecting the data (fulltime?) and the ARM is for diagnosis later?

We need to know the actual sensors to get a feel for how complex they will be to interface too, power requirements, etc.