Coupling portion for rotary surgical cutting systems
Aspects of the disclosure relate to surgical cutting systems having a surgical tool and a powered hand piece. The surgical tool can include a cutting tool having a coupling portion for selective connection to a drive pin of the hand piece. The coupling portion defines a tang that is configured to promote self-alignment of the cutting tool and the drive pin during connection of the cutting tool and the hand piece, thus promoting ease of use.
1 . A tang for connecting a cutting tool to a powered handpiece, comprising:
an extension portion coaxially aligned with a central axis defined through the tang;
a first interface surface defining a first plane that is parallel with the central axis, the first interface surface terminating at a first end surface oriented perpendicular to the first plane; and
a first ramp portion extending distally from the first end surface adjacent the extension portion.
2 . The tang according to claim 1 , further comprising:
a second interface surface defining a second plane that is parallel with the central axis, the second interface surface terminating at a second end surface oriented perpendicular to the second plane; and
a second ramp portion extending distally from the second end surface adjacent the extension portion.
3 . The tang according to claim 2 , wherein the second ramp portion extends from the second end surface at an angle of about 5 degrees to about 85 degrees.
4 . The tang according to claim 2 , wherein the second end surface is approximately 180 degrees from the first end surface.
5 . The tang according to claim 2 , wherein at least one of the first or second ramp portions is helical.
6 . The tang according to claim 2 , wherein a first interface wall extends radially away from the first interface surface.
7 . The tang according to claim 6 , wherein the first interface wall is arcuate.
8 . The tang according to claim 6 , wherein the first interface wall extends between the second ramp portion and a convergence point, which is a most proximal point at which the first interface wall contacts the first interface surface.
9 . The tang according to claim 2 , wherein the first interface surface is identical to the second interface surface.
10 . The tang according to claim 2 , wherein the extension portion terminates adjacent the first end surface and the second end surface.
11 . The tang according to claim 2 , wherein the extension portion extends beyond the first end surface and the second end surface.
12 . The tang according to claim 2 , wherein the connecting portion has first and second sides, each side including one of the first or second interface surfaces, and wherein the first side is a mirror image of the second side.
13 . The tang according to claim 1 , wherein the first ramp portion extends from the first end surface at an angle of about 5 degrees to about 85 degrees.
14 . The tang according to claim 1 , wherein the extension portion is cylindrical.
15 . The tang according to claim 1 , wherein the first interface surface is planar.
16 . The tang according to claim 1 , wherein the extension portion terminates adjacent the first end surface.
17 . The tang according to claim 1 , wherein the first ramp portion defines a straight outer edge.
18 . A method of coupling a surgical cutting tool to a powered handpiece, comprising:
coupling a distal end of a connecting portion to the surgical cutting tool;
coupling a proximal end of the connecting portion to the powered handpiece having a drive pin, the proximal end of the connecting portion having a tang, the tang including:
an extension portion coaxially aligned with a central axis defined through the connecting portion;
a first interface surface defining a first plane that is parallel with the central axis, the first interface surface terminating at a first end surface oriented perpendicular to the first plane; and
a first ramp portion extending distally from the first end surface adjacent the extension portion,
wherein during coupling of the tang to the powered handpiece, the tang, if misaligned, is configured to self-align with the drive pin disposed within the powered handpiece until the tang is in a fully seated position with the drive pin.
19 . The method of coupling a surgical cutting tool to a powered handpiece according to claim 18 , wherein the first ramp portion extends distally from the first end surface adjacent the extension portion at a first angle with respect to the first interface surface.
20 . The method of coupling a surgical cutting tool to a powered handpiece according to claim 19 , further comprising:
a second ramp surface defining a second plane that is parallel with the central axis, the second interface surface terminating at a second end surface oriented perpendicular to the second plane; and
a second ramp portion extending distally from the second end surface adjacent the extension portion at a second angle, the second ramp surface configured to facilitate self-alignment of the tang with the drive pin.
21 . The method of coupling a surgical cutting tool to a powered handpiece according to claim 20 , wherein at least one of the first or second ramp portions is helical.