Endodontic angle-piece
AssigneeAnthogyr, societe anonyme
InventorEric Lietaer
Life of this patent
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Abstract
A dental apparatus provided with a drive unit for operative dentistry instruments, specifically a powered system for performing the various phases of operative dentistry operations. This advanced dental apparatus is essentially characterized in that the working tool housed in a tool-holder sleeve, exhibits dampable, disengageable, reciprocating helical motion using a flexible cam. The cam is mounted on the rotational axis and its end is received in a hole in the sleeve. This device allows completely safe operative dentistry operations to be performed, while preventing false canals and instrument breakage, through the use of the flexible movement control device.
Claims11
An angle-piece for an endodontic instrument (2) comprising:
- a head (1),
- a transmission shaft (3) mounted so that it is guided and rotates in the head (1), the transmission shaft having a longitudinal axis,
- an instrument holder sleeve (5) that rotates about, and slides along, a transverse axis which is perpendicular to said longitudinal axis,
- a cam (10) that engages the instrument holder sleeve (5), said cam being driven by the transmission shaft (3), said cam being off-centred with respect to said longitudinal axis of the transmission shaft (3)
- wherein the angle-piece comprises a main transmission element the main transmission element being positioned between the cam and the transmission shaft (4), the main transmission element being made of a material having a modulus of elasticity, the main transmission element (4) being rotated by the transmission shaft (3) and being angularly and freely flexible in the head (1) with respect to said longitudinal axis of the transmission shaft (3), at its end,
- wherein, when forces (F) are applied to the instrument (2), bending of main transmission element (4) reduces an amplitude of movement of the instrument holder sleeve (5) and of the instrument (2).
An angle-piece for an endodontic instrument (2) comprising:
- a head (1),
- a transmission shaft (3) mounted for rotation in the head (1), the transmission shaft having a longitudinal axis,
- an instrument holder sleeve (5) that rotates about, and slides along, a transverse axis which is perpendicular to said longitudinal axis, and
- a transmission element (4), the transmission element having first and second ends, the first end being connected to the transmission shaft (3), the second end having a cam (10) which engages a hole (11) in the instrument holder sleeve, the cam (10) being off-centred with respect to said longitudinal axis,
- wherein the transmission element includes a flexible rod (7) which directly connects the first and second ends of the transmission element, wherein displacement of the cam (10) relative to said longitudinal axis causes displacement of the flexible rod (7) relative to said longitudinal axis.
In an angle-piece for an endodontic instrument (2), the angle-piece including a head (1), a transmission shaft (3) mounted for rotation in the head (1), the transmission shaft having a longitudinal axis, an instrument holder sleeve (5), and a transmission element (4), the transmission element having a first end connected to the transmission shaft (3) and a second end having a cam (10) which engages a hole (11) in the instrument holder sleeve (5), the cam (10) being off-centred with respect to said longitudinal axis,
- the improvement wherein the transmission element includes a flexible rod (7) which connects the first and second ends of the transmission element, wherein the cam is free to move with displacement of the flexible rod, and wherein displacement of the cam (10) relative to the longitudinal axis causes a corresponding displacement of the flexible rod (7) relative to the longitudinal axis.
Dependencies are inferred from the claim text.