Pin drive rotary surgical cutting tools and powered handpieces

Patent metadata

Field	Value
Publication number	US-2016278802-A1
Application number	US-201615018990-A
Country	US
Kind code	A1
Filing date	Feb 9, 2016
Priority date	Mar 25, 2015
Publication date	Sep 29, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . A surgical tool for use in the dissection of bone, biomaterials, and/or other tissue when mated with a motor, the surgical tool comprising:
an elongated shaft defining opposing, first and second ends, a dissection portion adjacent the first end, a coupling portion adjacent the second end, and an intermediate portion between the dissection and coupling portions, the intermediate portion defining a central axis of the shaft; 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, first and second intermediate edges connected to one another, first and second outer longitudinal edges connected to the first and second intermediate edges and an inner longitudinal edge connected to an intersection of the first and second intermediate edges, wherein the coupling portion includes: a first deflection surface bound by the leading edge and the first and second intermediate edges, the first deflection surface extending oblique to the central axis; and a first interface structure including:
a first driven surface connected to the deflection surface, the first driven surface bound by the first intermediate edge, the first outer longitudinal edge and the inner longitudinal edge; and
a second driven surface connected to the deflection surface and the first driven surface, the second driven surface bound by the second intermediate edge, the second outer longitudinal edge and the inner longitudinal edge.

2 . The surgical tool of claim 1 , wherein the first deflection surface is substantially planar.

3 . The surgical tool of claim 1 , wherein the first deflection surface defines a major plane arranged at an angle in a range of approximately 10 to 70 degrees with respect to the central axis.

4 . The surgical tool of claim 1 , wherein at least a portion of the second driven surface is substantially planar.

5 . The surgical tool of claim 1 , wherein at least a portion of the first driven surface is substantially planar.

6 . The surgical tool of claim 1 , wherein the first intermediate edge and the second intermediate edge extend orthogonally with respect to one another.

7 . The surgical tool of claim 1 , wherein an angle defined by the first intermediate edge and the inner longitudinal edge is in a range from 30 to 60 degrees.

8 . The surgical tool of claim 1 , wherein the leading edge and the second intermediate edge are parallel to one another.

9 . The surgical tool of claim 1 , wherein the intermediate portion defines a maximum outer diameter for the shaft with respect to the central axis, the first outer longitudinal edge positioned at a distance from the central axis equal to the maximum outer diameter.

10 . The surgical tool of claim 1 , wherein the coupling portion further comprises a circumferential groove between the first position and the second position.

11 . The surgical tool of claim 10 , wherein the circumferential groove interrupts the first driven surface and the second driven surface.

12 . The surgical tool of claim 1 , wherein a central plane divides the shaft into a first half and a second half with the deflecting surface, the first driven surface and the second driven surface positioned within the first half, the central plane including the central axis.

13 . The surgical tool of claim 12 , wherein the central plane bi-sects the leading edge.

14 . The surgical tool of claim 1 , wherein the coupling portion defines a maximum outer diameter from the central axis and further wherein, for a central plane including the central axis that extends parallel to the central axis and in a direction from the first end to the second end, the second intermediate edge extends from the maximum outer diameter toward the central plane.

15 . The surgical tool of claim 1 , wherein the coupling portion further comprises a second deflection surface and a second interface structure having a first driven surface and a second driven surface, each of the second deflection surface and the second interface structure formed on the shaft opposite the central axis from the first deflection surface and the first interface structure.

16 . A surgical tool for use in the dissection of bone, biomaterials, and/or other tissue when mated with a motor, the surgical tool comprising:
an elongated shaft defining opposing, first and second ends, a dissection portion adjacent the first end, a coupling portion adjacent the second end, and an intermediate portion between the dissection and coupling portions, the intermediate portion defining a central axis of the shaft; wherein the coupling portion includes exactly two interface structures, each interface structure positioned on opposite sides of the central axis and extending from a leading position at the second end to a trailing position spaced apart from the second end, each interface structure further defining a leading edge, first and second intermediate edges connected to one another, first and second outer longitudinal edges connected to the first and second intermediate edges and an inner longitudinal edge connected to an intersection of the first and second intermediate edges, wherein each interface structure includes: a first driven bound by the first intermediate edge, the first outer longitudinal edge and the inner longitudinal edge; and an second driven surface bound by the second intermediate edge, the second outer longitudinal edge and the inner longitudinal edge.

17 . The surgical tool of claim 16 , wherein the coupling portion further includes at least one deflection surface projecting from at least one of the exactly two interface structures to the second end.

18 . The surgical tool of claim 16 , wherein a central plane divides the shaft into a first half and a second half with a first one of the exactly two interface structures positioned within the first half and a second one of the exactly two interface structures positioned within the second half, the central plane including the central axis and extending parallel with the central axis.

19 . The surgical tool of claim 16 , wherein the first driven surfaces are substantially parallel to one another.

20 . The surgical tool of claim 19 , wherein the second driven surfaces are offset with respect to the central axis.

21 . The surgical tool of claim 16 , wherein the coupling portion further comprises a circumferential groove between the first position and the second position.

22 . The surgical tool of claim 16 , wherein the circumferential groove interrupts the exactly two interface structures.

23 . A surgical system for cutting tissue, the system comprising:
a powered handpiece including:
a housing,
a drive chuck disposed within the housing and including a drive pin defining a leading end, a first drive surface and a second drive surface; and
a surgical cutting tool releasably connectable to the powered handpiece, the surgical cutting tool including:
an elongated shaft defining opposing, first and second ends, a dissection portion adjacent the first end, a coupling portion adjacent the second end, and an intermediate portion between the dissection and coupling portions, the intermediate portion defining a central axis of the shaft;
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

Assignees

• Medtronic Ps Medical Inc

Inventors

• Cihak Paul
• Heiliger Zachary

Classifications

• B23B2231/0264

  Axial grooves · CPC title

• A61B2017/00398

  using powered actuators, e.g. stepper motors, solenoids · CPC title

• B23B2231/22

  Compensating chucks, i.e. with means for the compensation of irregularities of form or position · CPC title

• B23B31/1071

  Retention by balls (balls acting as jaws B23B31/22) · CPC title

• A61B2017/00477

  Coupling (A61B2017/0046 takes precedence) · CPC title