Docket No: PK3454668
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`PCT/KR2018/016796
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`1. A surgical drill for dental implant comprising:
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`CLAIMS
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`a cutting part having a plurality of cutting blades that comprise saw teeth and are
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`aligned in a circular shape so as to perforate the alveolar bone; and a connecting part
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`interposed between the handpieceand the cutting part, wherein the cutting part 10 includes:
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`the saw teeth 11 aligned in a circular shape at the upper end thereof; a cutting upper
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`part 12 extending downward from the saw teeth; a cutting lower part 13 protruding
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`downwardfrom the cutting upper part with an expanded diameter; and a coupling part 16
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`at least one or more protruding downwardly from the bottom surface of the cutting lower
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`10
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`part,
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`the connecting part includes:
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`a coupling protrusion inserted and interposed to the coupling hole of the cutting part,
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`a stepped part protruding downward from the bottom of the coupling protrusion with an
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`expanded diameter, and constraining the insertion length of the coupling hole; and an
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`15
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`extended part extendedly protruding from the bottom surface of the stepped part so as to
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`be connected to the handpiece, and
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`the coupling hole further provided with a threaded groove corresponding to a thread
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`of the coupling protrusion, so that the coupling protrusion and the coupling hole are
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`fastened to each other by a bolt fastening method.
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`20
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`2. A surgical drill according to claim 1, wherein the bottom surface of the cutting lower part
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`comprising:
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`14
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`Docket No: PK3454668
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`PCT/KR2018/016796
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`an extending protrusion 15 having a smaller diameter protruding downwards compared to
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`the outer periphery of cutting lower part; and
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`a recessed part corresponding to the extending protrusion that is further provided on the
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`upper surface of the stepped part, thereby reinforcing coupling force according to an expansion of
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`insertion depth between a coupling hole and a coupling protrusion, and a friction area between a
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`protrusion part and a recessed part.
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`3.
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`The surgical drill according to claim 2, wherein a plurality of latch protrusions having a sloped
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`surface at one side is provided at the lower end of the extending protrusion, and a plurality of
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`10
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`holding protrusions correspondingto the latch protrusions is further provided so as to prevent
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`from undesirable separations by latching each other when fastened.
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`4. The surgical drill according to claim 1, wherein the outer periphery of the cutting lower part
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`comprising a number marked according to the diameter of the cutting part.
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`15
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`5. Asurgical drill for dental implant comprising:
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`a cutting part having a plurality of cutting blades that comprise saw teeth and are aligned in a
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`circular shape so as to perforate the alveolar bone; and a connecting part interposed between the
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`handpiece and the cutting part,
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`20
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`the saw teeth aligned in a circular shape at the upper end thereof: a cutting upper part extending
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`downward from the saw teeth; a cutting lower part protruding downward from the cutting upper
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`part with an expanded diameter; and a coupling part at least one or more protruding downwardly
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`from the bottom surface of the cutting lower part,
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`15
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`Docket No: PK3454668
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`PCT/KR2018/016796
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`the connecting part is configured to include a coupling protrusion inserted into
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`the internal space of the cutting part, a stepped part protruding downward from the bottom
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`of the coupling protrusion with an expanded diameter, and constraining the insertion
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`length of the coupling hole; and an extended part extendedly protruding from the bottom
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`surface of the stepped part so as to be connected to the handpiece, the coupling hole
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`included to pass therethrough in the sameposition as the coupling part, and
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`a fixing nut fastening to some exposedportionsof the coupling part on the bottom
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`surface of a stepped part by passing the coupling space.
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`10
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`15
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`20
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`16
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