A medical device, comprising: a handle housing having a proximal end, a distal end, a longitudinal axis extending from the proximal end to the distal end, and an interior space therein; wherein the handle housing includes a side wall defining the interior space and extending from the proximal end to the distal end, a proximal aperture extending through the side wall of the handle housing to the interior space, and a distal aperture extending through the side wall of the handle housing to the interior space; an elongated outer sheath having a lumen therein extending distally from the distal end of the handle housing; an elongated inner member extending distally through the distal end of the handle housing within the lumen of the elongated outer sheath; a proximal flush port disposed within the interior space and in fluid communication with the elongated inner member; and a distal flush port disposed within the interior space and in fluid communication with the lumen of the elongated outer sheath, characterized in that the medical device further comprises a diverter and a support body fixedly attached to a proximal end of the diverter; wherein the diverter and the support body are fixed in position relative to the handle housing; wherein the proximal flush port is attached to the support body, wherein the support body includes two or more lumens extending longitudinally therethrough, wherein the proximal flush port is in fluid communication with the two or more lumens of the support body, wherein the elongated inner member includes several lumens (46, 48, 50, 52) extending longitudinally through the elongated inner member, wherein at least two of the lumens (46, 48, 50, 52) of the elongated inner member are in fluid communication with the proximal flush port. a handle housing having a proximal end, a distal end, a longitudinal axis extending from the proximal end to the distal end, and an interior space therein; wherein the handle housing includes a side wall defining the interior space and extending from the proximal end to the distal end, a proximal aperture extending through the side wall of the handle housing to the interior space, and a distal aperture extending through the side wall of the handle housing to the interior space; an elongated outer sheath having a lumen therein extending distally from the distal end of the handle housing; an elongated inner member extending distally through the distal end of the handle housing within the lumen of the elongated outer sheath; a proximal flush port disposed within the interior space and in fluid communication with the elongated inner member; and a distal flush port disposed within the interior space and in fluid communication with the lumen of the elongated outer sheath, characterized in that the medical device further comprises a diverter and a support body fixedly attached to a proximal end of the diverter; wherein the diverter and the support body are fixed in position relative to the handle housing; wherein the proximal flush port is attached to the support body, wherein the support body includes two or more lumens extending longitudinally therethrough, wherein the proximal flush port is in fluid communication with the two or more lumens of the support body, wherein the elongated inner member includes several lumens (46, 48, 50, 52) extending longitudinally through the elongated inner member, wherein at least two of the lumens (46, 48, 50, 52) of the elongated inner member are in fluid communication with the proximal flush port.