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A completely disposable, permanently assembled drill for perforating bone structures, which includes a generally annular drill body. A primary drill member is slidably and rotatably received in the distal end of the drill body. A driver is slidably and rotatably received in the proximal end of said

A completely disposable, permanently assembled drill for perforating bone structures, which includes a generally annular drill body. A primary drill member is slidably and rotatably received in the distal end of the drill body. A driver is slidably and rotatably received in the proximal end of said drill body. A pin and slot-type spring biased clutch is disposed on the confronting surfaces of the drill member and driver. The pin of the clutch projects through the triangular openings and the sidewall of the drill body so as to limit the throw of the clutch and to link the drill body and drill member together. The interaction of the pin against the triangular side of the slot in the drill body produces a component of force which tends to urge the clutch apart. When the drill is placed against the bone structure with a force sufficient to overcome the spring bias, the clutch will engage and the driver and drill member and the drill body will rotate together. The counterbore on the drill body provides a support for the drill mechanism so that the drill member may release when it penetrates the bone structure without having the remainder of the drill move in the direction toward the cranial cavity. The sleeve holds the drill body and driver together and is made of a material that degrades when subjected to sterilization.

대표청구항 ▼

Apparatus for drilling bone structure comprising: a generally cylindrical primary drill member having cutting surfaces at the distal end thereof and having a proximal end; a generally cylindrical driver having a distal end disposed in confronting relationship to said drill member proximal end and ha

Apparatus for drilling bone structure comprising: a generally cylindrical primary drill member having cutting surfaces at the distal end thereof and having a proximal end; a generally cylindrical driver having a distal end disposed in confronting relationship to said drill member proximal end and having a proximal end; a stem projecting from the proximal end of said driver and adapted for insertion into a drill chuck; clutch means including a cylindrical stem projecting axially from the proximal end of said primary drill member and having a diameter less than the diameter of said primary drill member; said cylindrical stem having a bore extending generally radially therethrough; said driver including an axial bore extending into the distal end thereof a distance less than the height of said drill member stem and adapted to receive said drill member stem with a clearance fit, said axial bore leaving an annular flange surrounding the distal end of said driver; a slot extending radially through said annular flange at the distal end of said driver in communication with said axial bore; a pin extending into said stem radial bore and adapted to be received into said driver transverse slot when said driver and said drill member are coupled together; and, whereby when said clutch is engaged, said pin engages said driver slot causing said drill member and said driver to rotate as a unit and drill into the bone structure and when said clutch is disengaged, said pin disengages from said slot causing said drill member to remain stationary as said drill rotates when the drill member penetrates through the bone structure.