45results about How to "Quick and efficient extraction" patented technology

The method and extractor relate to dentistry and are intended for extraction of metal instruments fragments from a root canal of the tooth, as these instruments may be broken and may get stuck here, for example, during endodontic treatment. According to the invention, two insulated metal electrodes assembled as a cylinder are inserted into the root canal until electric contact with the fragment to be extracted. Then electric current impulse is ran through the circuit formed by the first electrode, metal fragment and second electrode; the intensity and duration of the electric impulse shall be sufficient for welding of the fragment to the electrodes by means of heating at the contact points; this time a heating of the surrounding tissues remains at the physiologically acceptable level; afterwards the electrodes are extracted from the root canal together with the fragment. Depending on a clinical situation, electrodes of various size and configuration are used. Electric impulse is generated by the unit comprising a capacitor chargeable by a battery and dischargeable in pulsed mode via controlled electronic switch. The unit also has an indicator of contact resistance between the fragment and the electrodes for a better alignment of their relative positions.

The invention discloses a swinging combing corn-ear-picking device. The swinging combing corn-ear-picking device comprises a machine frame with a left machine wall and a right machine wall, at least one rotating combination crankshaft is horizontally installed between the left machine wall and the right machine wall, at least one end of the combination crankshaft is connected with another crankshaft through a connecting rod to form a four-bar linkage mechanism, the upper end of another crankshaft is hinged to the machine walls through a pin shaft, the position of the pin shaft is higher than the position of the top end of the combination crankshaft, and comb teeth evenly distributed at intervals are horizontally installed on the combination crankshaft. The comb teeth are driven by the combination crankshaft to enable free ends of the comb teeth to swing vertically. The swinging combing corn-ear-picking device is simple and reasonable in structure, light in gravity and small in energy consumption, corn ears can be picked off rapidly and effectively, and the picked corn ears have few lagging covers and do not need peeling.

The invention discloses a concrete pile head crushing device. The device comprises a machine body, a movable base and supporting arms, wherein the movable base is arranged at the bottom of the machinebody, rolling wheels are installed at four corners of the bottom of the movable base, and the supporting arms are welded on the two sides of the upper surface of the movable base; a rotating shaft ishorizontally arranged at the upper part of the machine body, and the machine body is characterized in that the left end of the rotating shaft is rotationally connected with the supporting arms on theleft side, and the right end of the rotating shaft penetrates through the supporting arms on the right side and extends to the right side of the machine body; and a first servo motor is arranged on the right upper portion of the machine body, the right end of the rotating shaft is welded with an output shaft of the first servo motor, the rotating shaft is provided with two first bevel gears withthe same size, an inner threaded pipe is vertically arranged below the rotating shaft, and the lower end of the inner threaded pipe is connected with a screw rod in a rotating mode. According to the device, the design is reasonable, the pile head which can be crushed is quickly realized, time and labor are saved, the construction difficulty is lowered, the life safety of constructors is guaranteed, and the device is suitable for popularization.