Electromagnetic Screening

You could also consider an plate (amulet like) made of MU metal. You can wear it under your clothes. It is light and thin. A Faraday cage is supposed to be grounded too, what seems very unpractical in your case. In my opinion it is more an electro magnetic shield that you need. (you might consider to become a knight in shiny armor too. Lol)

I don't know what level of protection is required, but here are some ready made garments...

http://www.lessemf.com/personal.html#250

If possible, you can make the de-fib device less susceptible to Electric fields by twisting the wires. Then use a shielded shirt.

Don't do welding, Stay away from working on microwave towers, don't take a rest against a 300 hP VFD motor.

Office work, surveying, tending a flock of sheep, working in a coffee shop, airline transport captain, fly fishing, sunning on the beach, golfing - should all be safe activities.

To be MOST effective, that 'Faraday Shield' vest should also be grounded!

However, that being said, most bioelectronic devices work on "differential" signals, so are pretty much immune to typical ac-induced signals...but NOT high-energy fields with overlaying RF or digital signals, such as MRI scanners, etc.

chainmail...

A quick search on google for e-fabrics came up with this:-

https://www.google.co.uk/#q=e-fabric&safe=active

There was one item on Amazon that doesn't seem to pricey (I know it's not that big a piece):-

http://www.amazon.co.uk/Conductive-Fabric-12-x13-MedTex180/dp/B004SQG704

Or maybe this:-

http://proto-pic.co.uk/conductive-fabric-12x13-ripstop/

You could have a go at making your own for the time being. Take a look at this site, I known it's a bit crude, but you could have a bit of fun refining it:-

http://www.instructables.com/id/Fused-Fabric-with-Conductive-Thread/

You could use carbon fibre instead of wires, which might make it a bit more flexible.

Graphene is a new product that could produce the sort of thing you're looking for. But it's a bit pricey at the moment and, I'm not sure if they've even started making fabrics from it yet.

I hope this is of some help to you and, I hope you find what you're looking for. That doesn't cramp your style. Smooooth.

All the Best

Excellent info, perusing the lesseremf.com site, reveals that upper chest shields are readily available and are suited for pacemaker wearers, but not only that, they carry, independent "pacemaker alert meters". The beauty of that is one can test the environment for EMF. Anyway thanks so much, this is definitely the way to proceed. Norm.

.

Birch, this man has heart problems. This type shield will keep him in bed for the

rest of his life.

It took a week to get the smile off his face

it turns out that depending of exact diagnosis the OP's "can do list" may vary a lot

as far as i got the heart conditions are to stay in common but there are ways to care yourself - speciffic diet , "lifstyle" , ? place to live - that may minimize the effects

consult your doc and local medicine men

Since you are thinking about EMF shielding using some type of a Faraday cage? Which to be effective, in itself has to be earthed to discharge any collected or accumulated energies.. Being in that condition, wearing a grounded electrically conductive material, you may actually appear like a lightning rod! In this kind of situation, I believe you should stay indoors, specially during thunderstorms!

On the other hand, defibrillators or AEDs by design are tested to be up to a certain degree non-sensitive to any EMF radiations. They are not readily susceptible to EMF radiations, so the farther you are physically away from RF radiators, the safer you are! The electrodes used to sense and pick up your ECG signals are supposed to be shielded as well. Any needed accessories must be from the OEM. Otherwise may come out to be of inferior quality or out of OEM specifications.

The weakest link where unwanted EMF may get into is at the entry point from your skin. This is where you make the actual electrical connections between those external lead wires coming from the unit will be patch to those imbeded wires that are coming from your heart!

Remember the square law on signal strengths... So the best solution is to stay away from any electrical devices!

OK Lads, Firstly, thank you one and all for your advice, interest, and comments, including the humerous ones...! The situation is that the device, pacemaker/defibrillator, is completely buried in my chest, there are no external wires, all that can be seen is a hard lump on the left hand side of my chest. My physician has advised that I stay away from electrical fields, such as that emanating from welders, electric motors, and the fields that exist beneath the bonnet of a motor vehicle etc. However, he said that he has patients who have constructed shields which allow them to not overcome these electrical fields but shield them from same. I am 72 years old and a retired electrician, so I am aware that what he is talking about is some form of Faraday screen. I am a bit of a handyman and I very often do a bit of welding in my workshop so it is not something I would be wearing on a constant basis. Apparently, normal power tools, such as hand held drills, grinders etc. aren't such a problem. A metal patch would obviously be ideal but forming it to suit the contours of my chest whilst not impossible may prove a challenge, (roman breast plates are in short supply here) and then of course there is the chicken wire solution. I thought that maybe there is a solution that I could wear, that whilst being very effective, I would not be aware of. Anyway lads, thanks again. Norm.

I have been looking for a picture bit could not find one.

Last time I was in Argentina and some guys made handbags out of the lids that come off aluminum cans of coke, sodas and beer. They wove a thin metal wire between the holes and made real beautiful creations with it. I am sure, when you find the lids (the rings that open the can), you might be able to assemble a very original shield and it will make you look "cool' too.

Those handbags had a really sophisticated look.

Usbport suggested twisting your wires. While you can't twist whatever wires are involved with your pacemaker, you can twist your two welding-cable wires, and connect the ground return close to your weld point. But the thing that bothers me about this whole scene is your mandated required choice of magnetic-field sensor to test the setup, your heart!

"But the thing that bothers me about this whole scene is your mandated required choice of magnetic-field sensor to test the setup, your heart!"

Mr Winfield,

I am not sure if this is what you have in mind?

There are implantable pacemakers (ICDs) that cardiac specialist (cardiologists) uses that I believe similar to what the OP described.. These ICDs are being calibrated, adjusted, and set while inside the patient's chest wall. The cardiologist can continuously monitor, tweak, fine tune or even re-program the ICD settings through the use of a computerized system via radio waves.. while worn by patient!

This knowledge was experience based while conducting inspections (functionality tests) on them about 15 years ago! Since they're basically a transmitter/ receiver set up, I'm sure its main weak point is also via unwanted or spurious RFs or EMF interference and radiations.. Its very possible a more robust design approach have been implemented for the past 15 years?

I see, you're thinking about the possibility of improperly reprogramming the pacemaker? Hopefully they're robust against that happening. No, I was imagining that the v = dB/dt voltages picked up on the leads to the heart would cause problems for the heart's electrical system. Understand, the reason behind the warnings is a topic I know next to nothing about!

That is true, as well as your dB/dt concerns is rightfully just since the intended application deals with only a very low output range of about 1 mV, at times even less! I believed this range & sensitivity part has been addressed early on in the design stages of the device. Beside having a very high CMRR, it is typical for the ICD units to come equipped with a very thin set of shielded lead wires as they come out of the ICD's. Aside from having shielded they are also in a pre-twisted form configuration, which I believe should addresses your concern as the wires get threaded thru the tissues.

Just a thought if I can remember correctly?

GW is so SO right!

...and having worked with Faraday cages, can I possibly recommend one to take EM levels inside the cage down to below an unknown level, without grounding the cage, and without the cage covering 360 degrees in all directions and having a mesh size of less than λ/4 when frequencies are unknown?

No, I cannot. IMHO a functional cage must be grounded and must have

mesh sizes < λ/4, and must provide 360 degree coverage.

Anything less is voodoo!