h a l f b a k e r yWhy not imagine it in a way that works?
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When the heart really gives in and can't be stimulated to pump, if you are lucky enough to be well insured or live in a country which cares about you, you'll be offered an artificial heart. This is basically an electric pump which gets plumbed into your existing vasculature.
Problems abound, particularly
regarding rejection and clot forming. The things calcify, clog and generally don't do too well. To be fair, they keep you alive, so all is not lost.
This idea is to take your original heart, leave it in place, not sever the arteries, give it a bit of a clean if required, strip back any excessive gristle and then construct a chamber around it. The non-heart section of the chamber is connected to a drive line in the same way as an artificial heart, providing the same kind of pulsating pressure which will force the heart to expand and contract within its chamber.
Because we've not connected new devices, surfaces etc. and we're using well optimised haemodynamic surfaces we will disturb the flow much less in this way. People will live longer safer and happier lives with fewer drugs.
Ventricular Assist Device
http://en.wikipedia...cular_assist_device
When your heart's only half-bad. [Spacecoyote, Dec 01 2007]
Dynamic Cardiomyoplasty
http://heart.bmj.co...nt/extract/82/3/263
[reensure, Dec 07 2007]
2-Stage Dynamic Cardiomyoplasty
http://www.freepate...ne.com/5603337.html
[reensure, Dec 07 2007]
[link]
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If it encases the heart, where will you put the motor? |
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Also the motor would have to be specially designed for the human body, but that's already baked with existing artificial hearts. |
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Another possibility is a jacket (worn externally) which compresses and releases the area in simulation of heartbeat. |
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There are some similarities functionally to a VAD. The motor can be external, we're pressurising the part of the container outside the heart and depressurising it. This takes over the entire functionality of the heart, just as with an artificial heart, and targets the same patients. The difference essentially is that instead of an artificial pumping chamber connected to the vasculature, the heart itself is used. |
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You know, Vincevincevince, that's not such
a stupid idea. |
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So you'd 'bag' certain outer sections of the heart and pulsatively pressurize them? That's an interesting one. Would the heart respond okay to being externally squeezed, or would it damage the tissue I wonder? |
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Really not a bad idea, and I love the word "vasculature" ! |
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I wonder if the rhythmic massage directly on the heart would do something to reduce/open cardiac blood vessels?
[+] |
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Is the idea sort of a "pressure bag" around
the heart, which can be pressurized to
compress the heart, and then
depressurized to allow it to expand again?
If so, it doesn't seem likely that it would do
much harm to the heart. I think this is an
ingenious idea. |
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Remember that there are
multiple chambers in the
heart, and you've got to get
your compression strokes &
valve timing properly
organized. How do you propose
to bag the heart so that the
left atrium gets compressed
before the left ventricle? |
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You can get away without an atrium - to
be honest, it's a bit of a nicety. That's why
cardiac massage works. |
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//You can get away without an atrium - to be honest, it's a bit of a nicety.// |
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I disagree. My first council house had its own atrium, and I immediately considered it essential. Now, every time I'm offered a council house, I turn it down due to the fact that it doesn't have an atrium. I'm currently homeless. |
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Ah yes, but did it contract rhythmically?
I'm pretty sure mine doesn't - at least the
one in the North Wing. I'll ask Fothergill to
check the others. |
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He says he doesn't recall any of the atria
contracting, but he's going to check with
Cook in the morning. I sympathise with
your homeless predicament - I was in the
same position last year. Had to live in the
bloody hunting lodge while they renovated
the panelling. It's no fun trying to manage
in a twelve-up, twelve-down - we were
practically tripping over the staff half the
time. |
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VinceVinceVince - this is a very innovative / original idea.
From my (very basic) understanding of the difficulties of making an artificial heart they have difficulties with: cloting (which would be largely solved by your idea I would think); hemolysis (also solved); fitting the device into the anatomical space available; powering the device; the device wearing out / reliability; heat dissipation and infection (if the device has tubes or wires which exit the body. |
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From the above list there are still a number of hurdles which this device may need to overcome, however I am wondering if it could be used as an adjunct for a weakly beating heart (ie cardiomyopathy), to increase the power of each 'beat'. |
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Also I am thinking it could squeeze the heart by using a memory metal muscle. |
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You SOB, thats MY IDEA! Anyway, its a great, who cares who came up with it first (ME! :) This is basicly like implanted permenent cardiac massage, the device would be placed around the heart, using computer control to pump the heart with, as brett-blob said, memory metal, and powered by a nuclear/recharageable battery placed in the open area left by removal of the spleen, no fuss, no muss, no clots! Ok so can we share the Nobel Prize? ;) |
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