Patent ID: 9248006
Filing Date: 2016-02-02
CPC Classification: A61C

Claim Text:
1. An extractor for removal of a metal fragment from a root canal of a tooth comprising: a first and second insulated metal electrodes made of a material same or similar in electric conductivity, heating capacity and melting temperature metal to a material of the metal fragment, the first and the second electrodes having a configuration suitable for insertion into the root canal and for contacting the metal fragment at contact points; a source for supplying an impulse of an electric current to a circuit formed by the first insulated metal electrode, the metal fragment and the second insulated metal electrode, the current and a duration of the impulse being sufficient for resistance welding of the metal fragment to the first and the second insulated metal electrodes at the contact points; wherein the first and the second electrodes are capable of being removed out of the root canal together with the metal fragment welded to the electrodes; and wherein the source for supplying the impulse further comprises a capacitor and a power supply unit to charge the capacitor to a pre-determined voltage, and a controlled switch which is pulsed-actuated during the discharge of the capacitor through the electrodes and the metal fragment.