A medical device comprising: a tubular member; a handle assembly connected to the tubular member, the handle assembly including: a handle housing, and an illumination assembly including: an illumination unit housed within an interior of the handle housing, an illumination fiber operatively coupled to the illumination unit, the illumination fiber extending through the interior of the handle housing into an interior of the tubular member, and a heat sink (68, 68', 68", 68′′′) coupled to the illumination unit, the heat sink (68, 68', 68", 68′′′) being configured to receive heat from the illumination unit, and dissipate the heat away from the illumination unit, wherein portions of a bottom surface of the heat sink (68, 68', 68", 68′′′) that form a lower cavity are in abutting contact with an LED of the illumination unit, wherein the heat sink includes an upper cavity on its top surface, the upper cavity extending in a direction substantially transverse to a longitudinal axis of the heat sink, wherein the heat sink further includes an illumination fiber passageway which extends in a direction substantially transverse to longitudinal axis of the heat sink and connects upper cavity to lower cavity, wherein a proximal portion of illumination fiber extends through the illumination fiber passageway, wherein a width of upper cavity is greater than a width of the lower cavity to provide a clearance between the illumination fiber and the heat sink as the illumination fiber bends, wherein an upper edge of a surface (86, 88) of the upper cavity of the heat sink (68, 68', 68", 68′′′) includes at least one chamfer (98, 100) that includes a slanted surface facing a concave bend in the illumination fiber to provide additional clearance between the illumination fiber and the upper surfaces and edges of the heat sink. a tubular member; a handle assembly connected to the tubular member, the handle assembly including: a handle housing, and an illumination assembly including: an illumination unit housed within an interior of the handle housing, an illumination fiber operatively coupled to the illumination unit, the illumination fiber extending through the interior of the handle housing into an interior of the tubular member, and a heat sink (68, 68', 68", 68′′′) coupled to the illumination unit, the heat sink (68, 68', 68", 68′′′) being configured to receive heat from the illumination unit, and dissipate the heat away from the illumination unit, wherein portions of a bottom surface of the heat sink (68, 68', 68", 68′′′) that form a lower cavity are in abutting contact with an LED of the illumination unit, a handle housing, and an illumination assembly including: an illumination unit housed within an interior of the handle housing, an illumination fiber operatively coupled to the illumination unit, the illumination fiber extending through the interior of the handle housing into an interior of the tubular member, and a heat sink (68, 68', 68", 68′′′) coupled to the illumination unit, the heat sink (68, 68', 68", 68′′′) being configured to receive heat from the illumination unit, and dissipate the heat away from the illumination unit, wherein portions of a bottom surface of the heat sink (68, 68', 68", 68′′′) that form a lower cavity are in abutting contact with an LED of the illumination unit, an illumination unit housed within an interior of the handle housing, an illumination fiber operatively coupled to the illumination unit, the illumination fiber extending through the interior of the handle housing into an interior of the tubular member, and a heat sink (68, 68', 68", 68′′′) coupled to the illumination unit, the heat sink (68, 68', 68", 68′′′) being configured to receive heat from the illumination unit, and dissipate the heat away from the illumination unit, wherein portions of a bottom surface of the heat sink (68, 68', 68", 68′′′) that form a lower cavity are in abutting contact with an LED of the illumination unit, wherein the heat sink includes an upper cavity on its top surface, the upper cavity extending in a direction substantially transverse to a longitudinal axis of the heat sink, wherein a width of upper cavity is greater than a width of the lower cavity to provide a clearance between the illumination fiber and the heat sink as the illumination fiber bends, wherein an upper edge of a surface (86, 88) of the upper cavity of the heat sink (68, 68', 68", 68′′′) includes at least one chamfer (98, 100) that includes a slanted surface facing a concave bend in the illumination fiber to provide additional clearance between the illumination fiber and the upper surfaces and edges of the heat sink.