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Joined: Jul 2009
Posts: 12
Novice
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OP
Novice
Joined: Jul 2009
Posts: 12 |
Hi everbody,In our Dermatology dept we have one of these machines.It is used for treatment of sweaty hands and feet.
It has a reverse polarity function.In one direction it increases the current supplied to the patient upto 27mA and then cuts back to 18 mA as a safety feature. However , in the reverse polarity mode it continues to rise to the max figure of 32mA with no safety foldback feature.Has anyone any expeience of this machine or its modes of operation?
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Joined: Feb 2004
Posts: 14,815 Likes: 72
Super Hero
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Super Hero
Joined: Feb 2004
Posts: 14,815 Likes: 72 |
My guess (and it is just a guess) is that the unit is faulty. That is, would you not expect it to operate in similar fashion at either polarity? There is a fair amount of general information on iontophoresis on line (Google, etc.) but nothing too specific on the unit mentioned. But if all else fails, perhaps you may be able to obtain information from these people. 
If you don't inspect ... don't expect.
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Joined: Jul 2001
Posts: 239
Master
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Master
Joined: Jul 2001
Posts: 239 |
Have you got the service manual for this? I just had a quick look and there is little apart from measure the current through a 2K2 4W or 1K 1W resistor. My guess, and it is a guess, would be one of the fibre optic channels is blocked. Best of luck speaking French!!
Dr Gazpacho Von Hovercraft is available for consultation
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Joined: Feb 2004
Posts: 14,815 Likes: 72
Super Hero
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Super Hero
Joined: Feb 2004
Posts: 14,815 Likes: 72 |
Aucune sueur!
If you don't inspect ... don't expect.
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Joined: Jul 2001
Posts: 239
Master
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Master
Joined: Jul 2001
Posts: 239 |
vite applez le medicin, j'ai mange les champignans venneneux
Dr Gazpacho Von Hovercraft is available for consultation
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Joined: Feb 2004
Posts: 14,815 Likes: 72
Super Hero
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Super Hero
Joined: Feb 2004
Posts: 14,815 Likes: 72 |
Magic!
If you don't inspect ... don't expect.
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Joined: Jul 2001
Posts: 239
Master
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Master
Joined: Jul 2001
Posts: 239 |
not sure but may have been, Parkside hospital in Macclesfield, an old asylum, had thousands in the grounds, i wonder if that was why there were so many psychotic patients????
Dr Gazpacho Von Hovercraft is available for consultation
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Joined: Feb 2004
Posts: 14,815 Likes: 72
Super Hero
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Super Hero
Joined: Feb 2004
Posts: 14,815 Likes: 72 |
I love those old "Victorian" sites. There's something about them that seems to be lacking in modern builds. Apart from the ... er, solid construction, it's probably the grounds, the spaciousness. Back in those days, patients were allowed time to convalesce, were they not? You know, leisurely strolls (staggers) around the grounds, gathering in the ... um, crop! Meanwhile ... back to the (topical) subject of sweaty palms (or feet ... there's a pleasant thought)!
If you don't inspect ... don't expect.
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Joined: Jun 2000
Posts: 2,412 Likes: 13
Hero
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Hero
Joined: Jun 2000
Posts: 2,412 Likes: 13 |
Has anyone any expeience of this machine or its modes of operation? Back to the topic please.
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Joined: Jul 2001
Posts: 239
Master
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Master
Joined: Jul 2001
Posts: 239 |
had a look at the circuit and to be honest there is very little in it at all. Looks like a class B amp output to the patient being driven by a common collector transistor. The fibre optics provide feedback into op-amp comparitors and then a differentiator/integrator (can't remember which is which, too long ago). should be easy enough to fault find on apart from the circuit diagram comes in 10 pages. All 1970's technology,CMOS and analogue, could have been a project in Everyday Electronics
Dr Gazpacho Von Hovercraft is available for consultation
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