Patent ID: 11944513
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An endodontic instrument for preparing an endodontic cavity space, the endodontic instrument comprising:
a shank configured for attachment to a motor to drive the endodontic instrument about a first axis; and
a body extending from the shank by a length, the body being solid and having a working surface between: (i) a shank end portion where the working surface and the shank meet and (ii) a tip end portion, at least a portion of the working surface being tapered such that the tip end portion has a diameter that is less than a diameter of the shank end portion,
the working surface comprising a plurality of transverse cross-sections, each transverse cross-section of the working surface having a center of mass, the working surface having a center of mass path defined by the centers of mass of the plurality of transverse cross-sections of the body, wherein at least a first transverse cross-sectional shape of the plurality of transverse cross-sections consists of:
a first convex portion;
a second convex portion that is separated from the first convex portion;
a first concave portion that extends along a first non-linear arcuate path from a first edge of the first convex portion to a first edge of the second convex portion; and
a second concave portion that is separated from the first concave portion and that extends along a second non-linear arcuate path from a second edge of the first convex portion to a second edge of the second convex portion,

wherein the endodontic instrument is configured to be radially compressible between: (i) an unconstrained configuration in which at least a portion of the center of mass path between the tip end portion and the shank end portion is offset from the first axis and spirals around the first axis along a length of the first axis, and (ii) a radially constrained configuration in which the portion of the center of mass path is more aligned with the first axis than in the unconstrained configuration,
wherein a cutting profile of the endodontic instrument is radially smaller in the radially constrained configuration than in the unconstrained configuration, and wherein the cutting profile of the endodontic instrument can radially expand during preparing the endodontic cavity space and
wherein the endodontic instrument is configured to cut in reciprocation and in pure rotation.