Humphrey ADE wanted!

RE: Humphrey ADE wanted!

Kay Abbott — Fri, 27 Oct 2017 17:27:04 GMT

[quote user="Gillian Mostyn"]

Yes, from anaequip. They're just not cheap...maybe the OP is trying to reduce the cost?

http://www.anaequip.com/ade

[/quote]absolutely! They are a bit pricey...but great. I expect i'll have to bite the bullet and buy one at full price.

RE: Humphrey ADE wanted!

David Mills — Mon, 23 Oct 2017 17:55:51 GMT

[quote user="Anthony Todd"]

[quote user="David Mills"]All the more reason not to use it.[/quote]

Yet none given??

[/quote]

https://en.wikipedia.org/wiki/Timeline_of_Australian_inventions

Not exactly an innovative people. Bank notes and spray on skin...

RE: Humphrey ADE wanted!

Anthony Todd — Mon, 23 Oct 2017 17:53:08 GMT

[quote user="David Mills"]All the more reason not to use it.[/quote]

Yet none given??

RE: Humphrey ADE wanted!

David Mills — Mon, 23 Oct 2017 17:40:27 GMT

[quote user="Anthony Todd"]"Stephens" was a human anaesthetist in Sydney.[/quote]

All the more reason not to use it.

RE: Humphrey ADE wanted!

Anthony Todd — Mon, 23 Oct 2017 17:37:22 GMT

[quote user="Edward Jones"]I've never been particularly impressed with the theory[/quote]

Sorry, but this is the usual cry of those fixated on a percentage value printed on the side of a vapouriser which has one, so obvious, embarrassing misunderstanding.

It depends on the minute volume of the patient and not what it says on the dial which was exactly why the %age is not put on the vapouriser!!

My analogy of my drinking overproof vodka, but only a sip an hour, and my mate drinking 5 pints of lager is apt. He'll be *issed first, it's the alcohol [or anaesthetic] intake over time that is the important thing!

Trouble is the "experts" who condemn the system can't seem to grasp this...

Oh, BTW, circuit resistance is 2cc water and O2 consumption is what the patient uses, in theory, so no need to run high flows or even a spill.

I've forgotten the %age of exhaled iso, but it isn't 0%, but, with clever design, the exhaled iso [minus the CO2], plus the added O2 plus the iso from the vapouriser at "maintenance" will nicely keep an animal at S3 for as long as you like.

The more potent the agent the lower level to fill the jar....

This is why you have them on full 'til S3 then on 3/8, with a Stephens, and is the principle behind 3/8 instead of 2% or whatever 'cos the percentage means nothing if the animal is not breathing, and nothing if it is hyperventilating.

And the vapouriser never needs calibrating. BTW "Stephens" was a human anaesthetist in Sydney.

RE: Humphrey ADE wanted!

Bob Russell — Mon, 23 Oct 2017 16:30:30 GMT

We monitor the iso levels but have found making any adjustments during induction (other than filling up the bag) unnecessary.

Induce, tube, put onto circuit whilst filling up the bag, turn down once bag full. Job done!

We have had uneventful anesthesia for nearly 17 years with our ADE! one recovery problem but that turned out to have a shunt!

We could turn the flow levels a bit lower than we do especially as we can monitor CO2, O2 and anaesthetic concentrations.

RE: Humphrey ADE wanted!

Edward Jones — Mon, 23 Oct 2017 16:04:17 GMT

I've never been particularly impressed with the theory behind the Humphrey ADE. The low flow aspect obviously means that the gas within the circuit is significantly diluted by recently exhaled gas. This has a massive impact during the transition from induction to maintenance - when the patient's exhaled gas has low levels of anaesthetic.

The fudge of using higher flow rates and higher percentages of anaesthetic during the transition from induction to maintenance means you don't really know exactly the percentage of anaesthetic gas that the patient is inhaling, and apnoea magnifies this issue.

In contrast, I saw a similar low flow re-breathing system for sale at LVS last year which was specifically designed such the inhaled gas came preferentially directly from the vaporiser (and therefore at a more exactly known percentage of anaesthetic), and was said not to require a higher flow rate or higher anaesthetic percentage during the transition to maintenance. I can try to track down it's name if anyone is interested.

Humphrey ADE circuits are okay - I've used them for years and know them inside out, but there's more to them than meets the eye, I believe.

RE: Humphrey ADE wanted!

Anthony Todd — Fri, 20 Oct 2017 20:58:22 GMT

Yes Martin, Medivet has a load of spares and my eight or more and I await someone's reply. Will chase them up.

RE: Humphrey ADE wanted!

Lindsey Edwards — Fri, 20 Oct 2017 20:43:45 GMT

I would not trade my mini lack for gold dust - very happy with it but am impressed by the versatility of the humphrey ADE. I do have 2 oxygen/anaesthesia locations and would improve versatility but not at full cost maybe for an added extra!

RE: Humphrey ADE wanted!

Rob Loxley — Fri, 20 Oct 2017 17:51:08 GMT

[quote user="Kay Abbott"]Does anyone have a Humphrey ADE sat gathering dust in a corner somewhere? We would love a second one if you feel like selling it...[/quote]

We have 2, really like them. But I do wonder if we wanted a 3rd and to spend less whether we might not buy a mini-lack and a separate circle?

RE: Humphrey ADE wanted!

Martin Atkinson — Fri, 20 Oct 2017 17:29:38 GMT

[quote user="Anthony Todd"]There are still Stephens around, discarded, denigrated, and unloved,by the academics but still used by some of the most exacting vets on here.[/quote]On which note: any advance on the ones your were talking about for me Tony?

RE: Humphrey ADE wanted!

Anthony Todd — Fri, 20 Oct 2017 17:03:20 GMT

There are still Stephens around, discarded, denigrated, and unloved,by the academics but still used by some of the most exacting vets on here.

I had 8 for years.

Better on all counts IMHO, let alone far cheaper to run.

RE: Humphrey ADE wanted!

Gillian Mostyn — Fri, 20 Oct 2017 16:22:17 GMT

Yes, from anaequip. They're just not cheap...maybe the OP is trying to reduce the cost?

http://www.anaequip.com/ade

RE: Humphrey ADE wanted!

Malcolm Ness — Fri, 20 Oct 2017 16:01:11 GMT

Are they no longer available to buy??

RE: Humphrey ADE wanted!

Bob Russell — Fri, 20 Oct 2017 15:54:59 GMT

And us!

Only a fool would have such a good bit of kit gathering dust IMO!

RE: Humphrey ADE wanted!

Lindsey Edwards — Fri, 20 Oct 2017 11:50:57 GMT

IF any ore spares I would love one also!