The new concept of “buckling force” in erectile dysfunction:
So Udelson developed a model that would predict the buckling force, based on penis length, circumference and the ease of expandability over a range of ICPs – it is a direct adaptation of 200-year-old column buckling research by Swiss mathematician Leonard Euler.Udelson tested the model against 57 men with erectile dysfunction. Each was measured by slowly injecting their penises with saline solution until erect. Udelson then applied a force to the tip of the penis until it started to bend, the first sign of buckling.
The model correctly predicted the buckling forces for 80% of patients – forces ranged from about 2 kilograms to just 0.3 kg given a pressure of 50 mmHg. But the buckling force during intercourse doesn’t just rely a man’s blood flow and penis shape, it also depends on his partner’s vagina.
(via kottke)
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{ 4 comments }
Isn’t this taking the concept of evidence based medicine just a little too far?
This is actually not a new copncept, but an old one, first popularized by Irwin Goldstein, a urologist, as early as the 1994.
Sleep labs used to perform nocturnal penile plethysmography (using strain gauges during polysomnography to measure nocturnal penile tumescence). The buckling force was also measured: the technician “…increases force gradually until either the penile shaft buckles or the meter reaches 1000 grams” (from Principles and Practice of Sleep Medicine, 3rd edition).
I am not aware of any sleep lab that is still doing this procedure.
In addition to the urologist’s talents in plumbing, we now add engineering !
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