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Building a DIY defibrillator in an emergency,

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SiliconWizard:

--- Quote from: Wallace Gasiewicz on September 29, 2023, 11:02:15 pm ---The silliest thing I have repeatedly seen in Movies and TV shows in the past is the application of a common AC wall outlet jolt to a victim. This is likely to produce more trouble than it can possibly alleviate.

--- End quote ---

Mr. Bean illustrates it brilliantly by making a parody of this. :)

johansen:
Is it 2000v or 300v needed to dump enough current?


4kv from a fully charged microwave oven cap is 4 to 8 joules assuming you can ensure you dont make a 500ma constant current source that does more than you want it to. The internal 10M ohm bleeder resistor means you have half a second to apply the pads or you lose half the charge.

340 from a dumb pwrsup or 400 volts from a pfc corrected supply is probably a bad idea


antenna:
CPR will not correct fibrilation (afaik), but the Modified Valsalva Maneuver might.  By sitting up with legs extended and blowing into something to increase chest pressure, blood is forced out of the heart.  After 10 seconds of this, you lay the patient on their back quickly while riasing their legs in the air.  That causes the blood to rush back in and the pressure stimulates a nerve (in the aorta i believe) and resets the heart rhythm.  It has a high sucess rate for SVT but, but from my understanding, only about 50% sucess for vfib. I have SVT, which for those that dont know is terrifying,  and that trick fixed it twice.  Scary sensation though, both SVT and when the Valsalva maneuver corrects it.

AVGresponding:
My point about finding an actual defib machine rather than trying to ghetto-fab one, is that a proper one will give you verbal instructions on how to use it, and knows whether and when to deliver a shock. You just can't know if a patient is in VF or the heart is stopped unless you're a medical professional with the correct tools. It's pretty easy to miss a weak pulse, even if you're a medical professional without tools, and giving a shock to someone in that situation is going to kill them.

There are lots of these things in public places nowadays, in the UK anyway, and the number keeps going up.

https://www.nddb.uk/

In short, go do a PROPER first aid course, and get a defib locator app on your phone. If you work in or near a public building in the UK, there will be one nearby; take the time to learn where it is.

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