HAND-HELD INSTRUMENT FOR DENTAL OR SURGICAL USE

摘要

The invention relates to a hand-held instrument, for dental or surgical use, intended to rotate a rectilinear detachable tool (13). It comprises: a tubular sheath (1); a hollow shaft (3) mounted to rotate inside the sheath and constituted: - by an upstream part (5), and - by a downstream part (6) itself comprising an upstream part (11) partially clasping the upstream part (5) of the shaft and a downstream part (12) whereof the internal diameter substantially corresponds to the external diameter of the tool (13); a clamp (14) secured in rotation with the shaft (3) but movable along its axis and placed inside the upstream part (5) of the shaft, concentrically to it; and means for moving the clamp (14) longitudinally in such a way that the jaws thereof (17) penetrate under the upstream part (5) of the shaft (3) thereby gripping the tool.