Pin drive rotary surgical cutting tools and powered handpieces
AssigneeMedtronic PS Medical, Inc.
InventorsPaul Cihak, Zachary Heiliger
Life of this patent
Estimating the term…
Abstract
A surgical cutting tool includes an elongated shaft and a cutting head. The shaft defines a coupling portion terminating at a proximal end of the shaft, a stem portion, and a distal portion. The stem portion defines a central axis. The coupling portion optionally defines a deflection surface positioned oblique with respect to the central axis and connected with a first driven surface and a second driven surface. Upon insertion into a drive chuck, the deflection surface promotes self-alignment of the cutting tool and the drive chuck.
Claims18
A drive chuck for receiving and supporting any one of a plurality of tools, each tool including a shaft forming a tang providing a coupling portion, the drive chuck comprising:
- a hub-like body defining an interior passage for receipt of a tool tang, the hub-like body carrying one or more balls configured to operably engage a circumferential groove defined within the shaft of the tool and configured to axially lock the tool within the drive chuck upon rotation of the one or more balls within the circumferential groove;
- a guide face defining a maximum diameter of the interior passage;
- a first drive body formed as a radially inward projection from the guide face;
- wherein the first drive body defines a first drive surface and a second drive surface, a major plane of the first drive surface being substantially perpendicular to a major plane of the second drive surface, and wherein, upon insertion of a tool into the drive chuck, a deflection surface defined on the shaft of the tool contacts the first drive body such that an insertion force causes the tool to rotate about a central axis of the tool and aligns a first driven surface of the tool with the first drive surface and the second driven surface of the tool with the second drive surface, once the driven surfaces are aligned, the balls of the hub-like body engage within the circumferential grooves to axially lock the tool within the drive chuck upon rotation of the hub-like body.
A surgical system for cutting tissue, the system comprising:
- a powered handpiece including:
- a housing,
- a drive chuck disposed within the housing, the drive chuck including:
- a hub-like body defining an interior passage for receipt of a tool tang, the hub-like body carrying one or more balls configured to operably engage a circumferential groove defined within a shaft of the tool and configured to axially lock the tool within the drive chuck upon rotation of the one or more balls within the circumferential groove;
- a guide face defining a maximum diameter of the interior passage;
- a first drive body formed as a radially inward projection from the guide face;
- wherein the first drive body defines a leading end, a first drive surface and a second drive surface, a major plane of the first drive surface being substantially perpendicular to a major plane of the second drive surface;
- and
- a tool releasably connectable to the powered handpiece, the tool including:
- an elongated shaft defining a central axis, a first end, a second end opposite the first end, and a tang adjacent the second end, the tang providing a coupling portion;
- wherein the coupling portion extends from a first position spaced apart from the second end to a second position at the second end, the coupling portion defining a leading edge, a first deflection surface extending from the leading edge, and a first interface structure including a first driven surface connected to and extending from the first deflection surface, and a second driven surface connected to and extending from the first deflection surface and the first driven surface;
- wherein upon insertion of the tang into the drive chuck, the first deflection surface contacts the leading end of the first drive body such that an insertion force causes the tool to rotate about the central axis and align the first driven surface with the first drive surface and the second driven surface with the second drive surface, once the driven surfaces are aligned, the balls of the hub-like body engage within the circumferential grooves to axially lock the tool within the drive chuck upon rotation of the hub-like body.
Dependencies are inferred from the claim text.