# US 2008/0187883 A1 · Wireless Recharger of Complete Melting Type For Encoding Treatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0187883 A1 - Document ID: US20080187883A1 - Status: Published application - Kind: A1 - Application number: 11/909,935 - Filed: 2006-02-27 - Published: 2008-08-07 - Earliest claimed: 2005-03-28 - Assignees: B&L Biotech, Inc. - Inventors: In-Whan Lee; Cheol-Su Kim; Seung-Ho Baek - Web page: https://patentgrep.com/patent/US20080187883A1 ## CPC - A61C 5/50: Implements for filling root canals; Methods or instruments for medication of tooth nerve channels - A61C 5/55: with heating means, e.g. for heating gutta percha - A61C 2204/002: using batteries - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) ## Abstract A complete melting type cordless filling instrument for endodontic treatment is disclosed which uses a switching circuit, to be operable using a miniature dry battery for supplying DC power. The filling instrument includes a body with a battery for supplying DC power, a heater at a front end of the body to heat and melt gutta-percha, an injector mounted to the body in front of the heater to discharge the melted gutta-percha, a charging part provided at the body to charge the gutta-percha in the body, a feeding member which feeds the gutta-percha charged in the body, a filling switch which turns on the heater, and a control circuit installed in the body, to control a temperature of the heating core and an operation of the heating core. The control circuit includes the filling switch, and a switching circuit adapted to efficiently maintain electrical energy supplied from the battery. ## Claims ### Claim 1 A complete melting type cordless filling instrument for endodontic treatment comprising: a body in which a battery for supplying DC power is arranged; a heater which is arranged at a front end of the body, to heat and melt gutta-percha; an injector which is mounted to the body in front of the heater, to discharge the melted gutta-percha; a charging part which is provided at the body, to charge the gutta-percha in the body; a feeding member which feeds the gutta-percha charged in the body at the charging part to the injector; a filling switch which turns on the heater; and a control circuit which is installed in the body, to control a temperature of the heating core and an operation of the heating core, the control circuit including the filling switch, and a switching circuit adapted to very efficiently maintain electrical energy supplied from the battery. ### Claim 2 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein the injector includes: an injector body which includes a gutta-percha inlet formed through the injector body, and a threaded coupling portion formed on an outer peripheral surface of the injector body; a needle which is rotatably mounted to the injector body, and is made of a bendable material; and a seal member which is mounted between the injector body and the body, to prevent the gutta-percha from being leaked. ### Claim 3 (depends on 2) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 2, wherein the needle includes: a cylindrical pipe; an annular protrusion formed at one end of the cylindrical pipe such that the annular protrusion has a diameter larger than a diameter of the cylindrical pipe, to enable the cylindrical pipe to be rotatably mounted to the injector body; and a tapered end formed at the other end of the cylindrical pipe. ### Claim 4 (depends on 2) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 2, wherein: the needle includes a pipe which is made of silver alloy coupled with one of copper alloy and SUS; the needle has a diameter of about 0.9 mm at one end of the needle at which the needle is mounted to the injector body; and the needle has a tapered end at the other end of the needle, the tapered end having a diameter varying from about 0.5 to about 0.9 mm. ### Claim 5 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein: the body is provided with a grip which extends downwardly such that an operator can grasp the grip; and the filling switch is mounted to the body in front of the grip, to enable the operator to easily operate the filling switch by the fingers. ### Claim 6 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein: the charging part includes a charging hole formed at a top portion of the body; and the feeding member includes a piston which has a front end arranged at the rear of the charging hole, and is forwardly moved through the charging hole when the filling switch is pressed, to cause the front end of the piston to push the gutta-percha. ### Claim 7 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, further comprising: an operation condition setting button and a display which are integrally installed on the body, to set an operation condition. ### Claim 8 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein the heater includes: heater bases which are different metals, respectively; a heating coil which is wound around one of the heater bases, and is made of a metal different from the metals of the heater bases; and a temperature measurer which measures a temperature of the heating coil. ### Claim 9 (depends on 8) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 8, wherein the temperature measurer includes: a thermally-isolated temperature detector; electric wires which connect the temperature detector and the heating coil; and a circuit which measures a thermal electromotive force generated at the electric wires, and calculates the temperature of the heating coil, based on the measured thermal electromotive force. ### Claim 10 (depends on 9) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 9, wherein: the electric wires include a first electric wire connected to one end of the heating coil, and a second electric wire connected to the other end of the heating coil; and the first electric wire is made of a metal identical to the metal of the heating coil, and the second electric wire is made of a metal different from the metal of the heating coil. ### Claim 11 (depends on 10) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 10, wherein the first electric wire has an electric resistance considerably lower than an electric resistance of the heating coil. ### Claim 12 (depends on 10) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 10, wherein the metal of the second electric wire generates a thermal electromotive force lower than a thermal electromotive force generated by the metal of the first electric wire. ### Claim 13 (depends on 10) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 10, wherein: the heating coil and the first electric wire are made of nickel; and the second electric wire is made of copper. ### Claim 14 (depends on 8) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 8, wherein the heating coil has a resistance of 0.2 to 1.0Ω. ### Claim 15 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein the body is made of an insulator, to prevent heat from being transferred to a grip which is mounted to the body such that an operator can grasp the grip. ### Claim 16 (depends on 15) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 15, wherein the body is provided with an insulating hole, to provide an insulating effect to the body. ### Claim 17 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein the switching circuit is a synchronous type buck converter switching circuit which includes two switches controlled to be alternately opened and closed, an inductor connected to one of the switches in parallel, and a resistor connected to the inductor in series. ### Claim 18 (depends on 17) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 17, wherein the resistor includes an element having a positive temperature coefficient. ### Claim 19 (depends on 1) The complete melting type cordless filling instrument for endodontic treatment as set forth in claim 1, wherein the battery is a rechargeable battery.