초록 ▼

A nozzle head (5) for a powder jet device (1), for use in applying dental material, comprises a first fluid flow path (8) for delivering a powder/fluid mixture to a first discharge nozzle (8A). A second fluid flow path (6) is provided for delivering a liquid to a second discharge nozzle (6A) located

A nozzle head (5) for a powder jet device (1), for use in applying dental material, comprises a first fluid flow path (8) for delivering a powder/fluid mixture to a first discharge nozzle (8A). A second fluid flow path (6) is provided for delivering a liquid to a second discharge nozzle (6A) located adjacent the first discharge nozzle (8A), so that the materials discharged by the first and second discharge nozzles combine at a desired location to form a dental composition. A nozzle-clearing member (10) is located inside the nozzle head and is movable to remove powder material from the first discharge nozzle when the flow of powder/fluid mixture to the nozzle ceases.

대표청구항 ▼

1. A nozzle head for a powder jet device for use in applying dental material, the nozzle head comprising: a first fluid flow path for delivery, to a first discharge nozzle, of a powder material carried by a fluid; anda nozzle-clearing member located inside the nozzle head and movable into or within

1. A nozzle head for a powder jet device for use in applying dental material, the nozzle head comprising: a first fluid flow path for delivery, to a first discharge nozzle, of a powder material carried by a fluid; anda nozzle-clearing member located inside the nozzle head and movable into or within the first discharge nozzle to remove powder material from the first discharge nozzle when the flow of powder-carrying fluid to the nozzle ceases, wherein the nozzle-clearing member is movable between a closed position in which the clearing member extends into the first discharge nozzle, and an open position in which the clearing member is removed from the first discharge nozzle. 2. A nozzle head as claimed in claim 1, further comprising a second fluid flow path to a second discharge nozzle located adjacent the first discharge nozzle. 3. A nozzle head as claimed in claim 2, in which the second discharge nozzle surrounds the first discharge nozzle. 4. A powder jet device comprising a nozzle head as claimed in claim 1, in which the first fluid flow path is connected to a source of fluid carrying the powder material. 5. A device as claimed in claim 4, in which the fluid is a gas. 6. A powder jet device comprising a nozzle head as claimed in claim 2, in which the second fluid flow path is connected to a source of liquid. 7. A device as claimed in claim 6, in which the liquid and the powder material are components of a dental composition. 8. A device as claimed in claim 4, in the form of a hand-piece on which the nozzle head is mounted. 9. A device as claimed in claim 8, in which the hand-piece comprises a reservoir for containing the powder material. 10. A method of using a device as claimed in claim 7 to form a dental composition at a desired location, comprising the step of positioning the nozzle head so that the materials discharged by the first and second discharge nozzles combine at the desired location. 11. A device as claimed in claim 1, wherein the first discharge nozzle is an outlet of the first fluid flow path. 12. A nozzle head as claimed in claim 1, in which the nozzle-clearing member comprises a plunger that is resiliently-biased towards a position corresponding to the closed position of the nozzle-clearing member, the plunger being movable by fluid pressure in the first flow path into a position corresponding to the open position of the nozzle-clearing member. 13. A nozzle head as claimed in claim 12, in which the nozzle-clearing member comprises an elongate nozzle-clearing portion that extends from the plunger to move into the first discharge nozzle when the nozzle-clearing member moves into the closed position.