Endodontic instrument having reversed helix
OwnerMichael J. Scianambloinventor
Life of this patent
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Abstract
Methods and apparatus providing an endodontic instrument having a reversed helix. An endodontic instrument in accordance with the invention includes a shaft that includes an end, a tip, one or more flutes, and a longitudinal axis. At least one flute includes a cutting edge configured to cut when the shaft is rotated in a first direction of rotation about the longitudinal axis. The at least one flute spirals around the shaft in an end-to-tip longitudinal direction and in a second direction of rotation that is opposite from the first direction of rotation.
Claims20
An endodontic instrument, comprising:
- a shaft that includes an end, a tip, one or more flutes, and a longitudinal axis, wherein at least one flute includes a cutting edge that is the leading edge of the flute when the instrument is rotated in a first direction of rotation about the longitudinal axis so that the instrument is configured to cut, without requiring force to be applied to the instrument in an end-to-tip longitudinal direction, when the shaft is rotated in the first direction of rotation about the longitudinal axis, and wherein the at least one flute spirals around the shaft in the end-to-tip longitudinal direction and in a second direction of rotation that is opposite from the first direction of rotation.
An endodontic instrument, comprising:
- a shaft that includes an end, a tip, one or more flutes, and a longitudinal axis, wherein at least one flute includes a cutting edge that is the leading edge of the flute when the instrument is rotated in a first direction of rotation about the longitudinal axis so that the instrument is configured to cut, without requiring the instrument to be threaded into a material to be cut, when the shaft is rotated in the first direction of rotation about the longitudinal axis, and wherein the at least one flute is situated to wrap around the shaft in an end-to-tip longitudinal direction and in a second direction of rotation that is opposite from the first direction of rotation.
An endodontic instrument, comprising:
- a shaft that includes an end, a tip, one or more flutes, and a longitudinal axis, wherein the instrument is a rotary type instrument and at least one flute includes a cutting edge that is the leading edge of the flute when the instrument is rotated in a first direction of rotation about the longitudinal axis so that the instrument is configured to cut when the shaft is rotated in the first direction of rotation about the longitudinal axis, wherein the instrument is not required to be rotated in a reciprocating manner in order to cut, and wherein the at least one flute is situated to wrap around the shaft in an end-to-tip longitudinal direction and in a second direction of rotation that is opposite from the first direction of rotation.
Dependencies are inferred from the claim text.