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#21
05-24-2019, 11:44 AM
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Most of the time, for fatigue tests you'd read that range as the minimum load was 135N and maximum was 1350N and that each cycle went from minimum to maximum. They didn't specify that, but that's the way I report fatigue test parameter when I perform them on the product (non-medical stuff) that I test. If that's the way to read it, picking a 135N minimum load was the right thing to do as that's way too low for a normal disk to really see except in unusual circumstances; thus the test would be conservative on that end.
On the other hand, I only glanced over the report and saw a few bone-headed mistakes that makes me wonder about the report. Fournier transform is called out in the spectroscopy section when the correct term is Fourier Transform or commonly FT by those who use it frequently. Might be a simple misspelling or it might be that the report was written by someone who's compiling data that they don't understand. If it's the latter, there might be hidden assumptions throughout that aren't necessarily the way an expert in that field might have reported it.
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Laura - L5S1 Charitee C5/6 and 6/7 Prodisc C Facet problems L4-S1 Knee, Shoulder, Toe, Finger, Elbow Problems Jim - no spine problem but lots of other fun medical challenges "There are many Annapurnas in the lives of men" Maurice Herzog 
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#22
05-24-2019, 04:46 PM
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Thank you Anna. Good point that I hadn't considered was that the disc was always under compressive stress and just that it cycled up to 1350N at 4Hz... Which I agree would be a pretty good stress test if they did 40 million cycles.
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L4-L5 Broad Diffuse Bulge, mildly contacting left L5 nerve root L5-S1 Broad Central Disc Protrusion mildly impinging left S1 nerve root "Mild scoliosis of lumbar spine". Does not feel mild to me. C5-C6, C6-C7 bulging, bone spurs. Imaging not looking good. Surgery scheduled with Dr. Desai in mid-late October.
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#23
08-10-2019, 06:44 PM
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I find it interesting that the studies on the LP-ESP state that it passes a number of biocompatibility tests.
But it also mentions that after 10 million cycles in a saline solution... "The tests looking for salted out or released matter showed the emission of\1 mg/kg methylene diphenyl 4-4 diisocyanate and of 64.9 mg/kg of 4-4 methylene diamine. These results are consistent with the data in the literature " Wikipedia suggests that MDA is a suspected carcinogen. And: "The Occupational Safety and Health Administration has set a permissible exposure limit at 0.01 ppm over an eight-hour time-weighted average, and a short-term exposure limit at 0.10 ppm" So to me - 64.9 mg per kg of saline... That seems like a lot.
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L4-L5 Broad Diffuse Bulge, mildly contacting left L5 nerve root L5-S1 Broad Central Disc Protrusion mildly impinging left S1 nerve root "Mild scoliosis of lumbar spine". Does not feel mild to me. C5-C6, C6-C7 bulging, bone spurs. Imaging not looking good. Surgery scheduled with Dr. Desai in mid-late October.
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