UNLABELLED This clinical trial aimed at comparing the intensity of pain and bruising by subcutaneous and intramuscular injections using and retractable fixed syringes and needles and syringes with no needles combined, at a public hospital in Sao Paulo, for six months. We evaluated the perception of pain in case of intramuscular (n=1000) and subcutaneous injections (n=240). In subcutaneous appli...

A retractable electron emitter has been constructed for the creation of unperturbed pure electron plasmas on magnetic surfaces in the Columbia Non-neutral Torus stellarator. The previous method of electron emission using emitters mounted on stationary rods limited the confinement time to 20 ms. A pneumatically driven system that can retract from the magnetic axis to the last closed flux surface...

This paper describes the design of a retractable intramedullary nail for the humerus that does not require inter-locking screws. The developed nail has a series of fins which open out from the casing to grip the medullary canal of the bone, thus securing it in position. Prototypes of the nail have been mechanically tested using static compression, dynamic compression and static torsion tests. D...