Open image in new window Fig. 2 The 'Defensive Antibacterial Coating' (DAC®) hydrogel coating is spread onto a plate and a screw for osteosynthesis in an ankle fracture.
The proximal femoral nail antirotation (PFNA®), designed by AO, is an intramedullary device with a helical blade rather than a screw for better purchase in the femoral head and was tested in a clinical study.
Ever since Archimedes invented a screw for drawing it up from wells, water has plagued mankind.
Let's take this to an extreme: prostitutes and porn stars screw for a living.
This greatly increases the amount of torque you can put on the screw for a given amount of hand pressure.
"Any time you find a hole that's too big for a screw, put a toothpick or wooden match into it and then try the screw," he said.
When the drill had gone through the bone, Xhumari pulled it out; the result looked like the hole for a screw in a piece of plastic furniture.
The outstanding feature of Maudslay's lathe was a lead screw for driving the carriage.
It's even got a tripod screw for serious stuff.
Purchase a hook screw for your ceiling.
