Aswad -> RE: Internal Water Sports? (12/3/2011 3:02:13 PM)
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ORIGINAL: Termyn8or you clean lenses with acid ? Sounds like that would screw up the coating Depends on the coating. You obviously have to take into account the surface chemistry of the lens. The ones I clean are titania dielectric coated ones and uncoated ones. Titania hardcoats are not dissolved by sulfuric acid in dilute form; in fact, they require concentrated sulfuric acid near boiling to be dissolved. Fused quartz is totally inert as far as sulfuric acid is concerned, and can even be subjected to a pirhana etch if you have the equipment to handle one (do not attempt this at home, ever). The more common magnesium fluoride antireflective coatings must never be exposed to sulfuric acid, even dilute, as that will form hydrofluoric acid (extremely toxic, corrosive, reacts with water, absorbed through skin) and etch the glass to form tetrafluorosilane (very toxic, corrosive, reacts with water) and fluorosilic acid (toxic, corrosive). These are, apart from damaging the lens, very likely to damage the person working with it. As I said, it is necessary to know how to do this safely to reap the benefits. quote:
Many people self catheterize. I know. I've had a urethal sphincter cramp as a drug side effect. Almost burst my bladder waiting in the ER, and had to do the self catheterization thing for a week after that. It was worth it, but I can't say it ranks as a pleasant memory. Regardless, self catheterizing is not quite the same as injecting fluids through the catheter. When self catheterizing, you use a sterile catheter that has been allowed to soak in sterile saline for a while and then been rinsed through with saline. You bypass the sphincter with it, and the pressure causes the fluid to drain. Then you remove it. You don't go filling up your bladder again. That's irrigation, which is not directly comparable to plain catheterization. quote:
He would catheterize himself every trip to the bathroom, but I'm not sure he went deep. By that I mean past the muscles (pubococcal or something like that) since he did it "on demand". He was not incontinent. It was just the most convenient way for him to use the beer recycler. Incontinence does not require catheterization. Being unable to void does. Using a catheter to direct urine wherever is convenient if you have reduced mobility. quote:
I have no idea how to tell you to sterilize a catheter enough. The ones you would use for irrigation I think would tend to be very difficult to sterilize. I would imagine boiling and then exposure to strong UV light might do it but don't bank on it. That sounds like a surefire way to sustain an injury. Almost every plastic out there degrades under UV light, and boiling affects a lot of them. Chances are you will end up with a catheter that is brittle and potentially sharp, both of which are desireable to avoid. I don't much care to elaborate, but you don't want the catheter to be rigid, brittle, sharp or even dry. quote:
I think UTIs are not a common cause of death so unless you screw up the procedure really badly you will live. The urinary tract is not necessarily where a catheter stops... And the fluid injected can be as much of an issue as the catheter itself (which is admittedly trivial to use, at least on oneself). Health, al-Aswad.
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