Abstract:
A dental abutment system permitting to limit the steps and time required for a dental implant procedure. The dental abutment system (10) comprises a cap (12) coupled to a retentive member (14) that is coupled to a sheath (16). The cap (12) has a shaft (18) for coupling with a bore (24) of a dental implant (20) and the sheath (16) is coupled to the bore (24) of a dental prosthesis (26) such that the dental prosthesis (26) is frictionally retained to and removable from the cap (12). The retentive member (14) may include an area-of-weakness permitting it to break-away from the cap (12) to avoid the transmission of excessive forces to the implant (20).
Abstract:
An inverter for diagnostic X-ray equipment, comprising a thyristor bridge with an input diagonal connected in series with two commutating inductances across a DC power supply, is provided with a start-stop circuit which includes an ancillary thyristor connected in series with a diode and a current-limiting impedance across one of the bridge arms. On start-up, the ancillary thyristor is triggered simultaneously with the diagonally opposite bridge thyristor in order to connect the current-limiting impedance in series with the AC output diagonal of the bridge during the first half-period; for a quick cutoff, the ancillary thyristor and the associated bridge thyristor are turned on together whereby two previously charged quenching capacitors, one of them included in the start-stop circuit, are discharged through the commutating inductance in series with the associated bridge arm to terminate conduction in another bridge arm fed through the same commutating inductance. A protective unit connected across the input diagonal of the bridge includes a further capacitor, charged from an auxiliary voltage source, which reverse-biases the bridge thyristors by way of another thyristor fired upon detection of a short circuit or overload.
Abstract:
An intra-uterine contraceptive device of the inflatable type provided with a plurality of protrusions for providing an unimpeded passage of the menstrual flow, such protrusions in one embodiment are wave-like configurations and in other embodiments they are arm-like extensions for providing also a plurality of contact regions with the inner wall of the uterus.
Abstract:
The invention relates to an apparatus for the removal of ferromagnetic materials from liquids, organic or inorganic compounds and mixtures, respectively, mainly fuels, for treating with a magnetic field and reduction of surface tension.The apparatus according to the invention contains a plurality -at least two- coaxial magnets having a hole therein and being in the direction of flow of the liquid and being separated by a disc, as well as housing made of a non-magnetizable material closed at both ends with end-closing means and provided with a bore for passing through the liquid to be treated.
Abstract:
An intra-uterine contraceptive device of the inflatable type provided with a plurality of protrusions for providing an unimpeded passage of the menstrual flow, such protrusions in one embodiment are wave-like configurations and in other embodiments they are arm-like extensions for providing also a plurality of contact regions with the inner wall of the uterus. Also devices are disclosed for the insertion of the contraceptive device.