Actuators for medical devices and related systems and methods
According to an example, a handle assembly for a medical device may comprise a handle body, and a first knob for controlling movement of a distal portion of the medical device, the first knob may comprise a first rotational axis, and a second knob for controlling movement of the distal portion of the medical device, the second knob may comprise a second rotational axis, wherein the first rotational axis may be spaced from the second rotational axis.
1 . A handle assembly for a medical device, the handle assembly comprising:
a handle body;
a first knob for controlling movement of a distal portion of the medical device, the first knob rotatable about a first rotational axis,
wherein a radially outermost surface of the first knob tapers relative to the first rotational axis in a first direction; and
a second knob for controlling movement of the distal portion of the medical device, the second knob rotatable about a second rotational axis,
wherein a radially outermost surface of the second knob tapers relative to the second rotational axis in a second direction,
wherein the first rotational axis is offset from the second rotational axis.
2 . The handle assembly of claim 1 , wherein the first knob includes grip protrusions extending radially outward, relative to the first rotational axis, from a radially outward facing surface of the first knob.
3 . The handle assembly of claim 1 , wherein the first rotational axis is substantially parallel to the second rotational axis.
4 . The handle assembly of claim 1 , wherein the handle assembly further comprises a first gearing assembly configured to rotate a first actuation shaft around the second rotational axis when the second knob rotates about the second rotational axis, wherein the first actuation shaft is offset from the first rotational axis.
5 . The handle assembly of claim 4 , wherein the first gearing assembly is contained within a casing positioned between the first knob and the second knob.
6 . The handle assembly of claim 4 , wherein the first gearing assembly includes a first gear fixedly coupled to the second knob and fixedly coupled to the first actuation shaft.
7 . The handle assembly of claim 6 , wherein the first gearing assembly further comprises a second actuation shaft fixedly coupled to a second gear and configured to rotate about the first rotational axis when the second knob rotates.
8 . The handle assembly of claim 7 , wherein the second actuation shaft is coupled to a second gearing assembly internal to the handle body, wherein the second gearing assembly includes a fourth gear coupled to the second actuation shaft, a fifth gear coupled to an actuation wire, and a sixth gear engaged with the fourth gear and the fifth gear.
9 . The handle assembly of claim 7 , wherein the second actuation shaft is offset from the second rotational axis.
10 . The handle assembly of claim 1 , wherein the second rotational axis is spaced approximately ten millimeters from the first rotational axis.
11 . The handle assembly of claim 1 , wherein the handle body includes a first side and a second side opposite from the first side, wherein each of the first knob and the second knob is positioned on the first side.
12 . The handle assembly of claim 11 , wherein the first knob is positioned between the first side of the handle body and the second knob.
13 . The handle assembly of claim 1 , wherein the first knob includes a series of radial protrusions, and each radial protrusion includes a recessed portion at a tip of the respective radial protrusion.
14 . The handle assembly of claim 1 , further comprising a support member extending longitudinally from the handle body, wherein the second knob is positioned on a distal end of the support member.
15 . The handle assembly of claim 14 , wherein the first knob comprises an opening, and wherein the support member extends through the opening of the first knob.