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Sherlock Ohms

Batteries' Chargers Require a Little Muscle

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warren@fourward.com
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Platinum
Re: No solution for this one.
warren@fourward.com   5/24/2012 8:27:35 PM
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We were talking hospital plugs, weren't we?  I think you reverted to the lawn mower question.

 

warren@fourward.com
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Re: Alarming alarms
warren@fourward.com   5/24/2012 8:28:54 PM
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With 50 alarms going off at the same time, and the heart attacks created, it would be good for business. 

warren@fourward.com
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Re: Alarming alarms
warren@fourward.com   5/24/2012 8:28:55 PM
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With 50 alarms going off at the same time, and the heart attacks created, it would be good for business. 

TJ McDermott
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Blogger
Re: No solution for this one.
TJ McDermott   5/25/2012 1:18:54 AM
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Warren, a twist-lock plug and receptacle would fix this problem.  The important outlets in a hospital SHOULD be different from a conventional outlet, so mundane things like a fan or radio cannot be plugged into them.

Twist-locks would keep the receptacles dedicated to hospital equipment, be easy to use, prevent accidental unplugging.

It's a Hat-trick solution.

warren@fourward.com
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Platinum
Re: No solution for this one.
warren@fourward.com   5/25/2012 6:42:10 AM
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I like the twist lock suggestion.  Nice trick, Mr. Hat.

This may not be the only application where a critical circuit could come unplugged.  The twist-lock would solve those problems, as well.  And think of the electricians that could be put to work!

 

KMoffett
User Rank
Iron
Re: No solution for this one.
KMoffett   5/25/2012 8:09:51 AM
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TJ,

Twist-loc connectors might solve that particular problem, but would cause greater ones.

First, 120VAC medical equipment with attached cord sets (in the US) come with "standard" hospital-grade 3-prong plugs. And, all standard outlets accommodate these. The cost of switching all outlets where a device might be used and all device plugs to compensate for this one problem would be prohibitive.

Second, medical devices running in battery-mode frequently accompany transported patients.  That would mean that any area or vehicle where the patient might be held for any significant length of time would also have to accomodate these plugs for recharging to maintain operation. That would include ambulances, clinics, waiting rooms, hallways....even homes.

That problem, in that hospital was resolved economically through staff awareness.

As an aside, a large percentage of medical devices are now using wall-plug power supplies...for two reasons. The medical devices could be made smaller. And, maybe more practically, the UL approval is now entirely on the power supply manufacturer, not on the medical devise manufacturer. The "wall-warts" compounded our outlet problem. I'm sure you've experienced the situation of a wall-plug supply, plugged into one outlet of a duplex, blocking the second outlet. Each such device occupies two outlets.

Ken

EEMEDIC
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Silver
Lose Plugs...
EEMEDIC   5/25/2012 9:33:28 AM
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We have similar problems with loose charging plugs of battery operated equipment on ambulances...and of course the battery is always dead when you need it most. Maybe its time we created a new "standard" outlet for medical equipment....something easy to use but with better retention...and then create a simple adapter that allows the device to be used in a standard outlet, of course the adapter needs to be somehow mounted to the plug so its never lost...medical equipment typically doesn't have the same price pressures as consumer electronics...when you buy a $30,000 EKG monitor, you don't mind paying a few extra $ for a plug that works!  One simple solution that we have tried that seems to work is switching to plugs with small LED power indicators in them, with a quick look you can tell if there is power being supplied to the power cord.

Rob Spiegel
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Blogger
Re: Battery charging.
Rob Spiegel   5/25/2012 10:30:48 AM
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It sounds like staff training was the only reasonable solution, Ken. Why is this situation unique? Apparently this was not a problem in the older building.

bob from maine
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Platinum
Re: Lose Plugs...
bob from maine   5/25/2012 10:31:52 AM
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I'm guessing that a partially inserted plug with exposed metal could be considered a hazard, so what may seem to be the obvious solution is to require the plug to be fully inserted by moving the contacts deeper into the socket. Ditto with old worn-out plugs falling out indicating thicker contacts to prevent poor retention. Then the facilities team puts the plug up in the air so the cord can't touch the floor and will be easily seen. Adding the human element of nurses who have become accustomed the old non OSSHA, easy-plug, early wear-out, non facilities enhanced plugs and the expected outcome is exactly what we're seeing. The people designing the next hospital or laboratory unfortunately are not the ones who use all these newly deisgned products. They all look good in a catalog and once bought and installed, they'll last for years.

streetrodder
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Gold
Re: No solution for this one.
streetrodder   5/25/2012 10:43:21 AM
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To build on Ken's argument regarding twist-lock plugs:

Operating rooms used to require twist-lock plugs.  They don't any more.  It doesn't work. 

Reasons:  In the OR, it's not unusual for someone/something to snag a power cord.  with a regular plug, the device comes unplugged - not good, but better than what happened with twist lock plugs.  Those are - the clinician trips, dropping whatever they have, possibly hitting others, etc. etc.  The cord tears out of the plug, rendering the device useless, and depending on the case, causing a major hazard. 

In a NICU, or any critical clinical area, the solution of twist lock plugs/outlets or other specialized combo simply doesn't work.

Think of a hospital as an oversized piece of equipment - except it's always being redisigned on the fly, inputs and outputs randomly change, and a large part of the components (the people) are generally running just above the chaos threshold.

Regards,

Paul Sherman, CCE

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