A catheter comprising: a proximal end and a distal end opposite the proximal end; a port housing disposed near the proximal end having a main inlet port fluidically coupled to a main fluid flow channel having a flow channel wall (46, 48), and two or more fluid inlet port housings (24, 24A, 24B) each fluidically coupled to a fluid flow channel (34, 34A, 34B); a cylindrical shaft having an outer surface wall enclosing the fluid flow channel(s) (34, 34A, 34B); a fitting connecting the port housing to the cylindrical shaft; wherein the main fluid flow channel extends longitudinally through the cylindrical shaft from the proximal end to the distal end of the catheter; wherein the two or more fluid inlet port housings (24, 24A, 24B) each further comprise a fluid inlet port for receiving and channeling a fluid; wherein each fluid flow channel (34A, 34B) is disposed within and extends longitudinally through the cylindrical shaft, and terminates at a balloon inflation port (36, 36A, 36B, 36C) fluidically coupled to a balloon inflation orifice (38, 38A, 38B) operable to channel fluid into a balloon; a selectively inflatable external balloon secured to and engirdling a portion of the outer surface wall of the cylindrical shaft and enclosing at least one balloon inflation orifice (38, 38A, 38B), wherein the selectively inflatable external balloon is fluidically coupled to at least one balloon inflation port (36, 36A, 36B, 36C), fluid flow channel (34, 34A, 34B), and fluid inlet (32A, 32B); an internal balloon valve (40B, 40B', 40B", 40B′′′) disposed inside the cylindrical shaft, engirdling a portion of the flow channel wall of the main fluid flow channel and enclosing at least one balloon inflation orifice (38, 38A, 38B), wherein the internal balloon valve (40B, 40B', 40B", 40B"') is fluidically coupled to at least one balloon inflation port (36, 36A, 36B, 36C), fluid flow channel (34, 34A, 34B), and fluid inlet (32A, 32B); wherein the internal balloon valve (40B, 40B', 40B", 40B"'), when inflated, distends a portion of the flow channel wall inwardly such that fluid flow through the main fluid flow channel is restricted except for fluids introduced to main inlet port under pressure; and an outlet port disposed at the distal end fluidically coupled to the main fluid flow channel; characterized in that inflating the internal balloon valve (40B, 40B', 40B", 40B′′′) collapses the flow channel wall until the main fluid flow channel is closed. a proximal end and a distal end opposite the proximal end; a port housing disposed near the proximal end having a main inlet port fluidically coupled to a main fluid flow channel having a flow channel wall (46, 48), and two or more fluid inlet port housings (24, 24A, 24B) each fluidically coupled to a fluid flow channel (34, 34A, 34B); a cylindrical shaft having an outer surface wall enclosing the fluid flow channel(s) (34, 34A, 34B); a fitting connecting the port housing to the cylindrical shaft; wherein the main fluid flow channel extends longitudinally through the cylindrical shaft from the proximal end to the distal end of the catheter; wherein the two or more fluid inlet port housings (24, 24A, 24B) each further comprise a fluid inlet port for receiving and channeling a fluid; wherein each fluid flow channel (34A, 34B) is disposed within and extends longitudinally through the cylindrical shaft, and terminates at a balloon inflation port (36, 36A, 36B, 36C) fluidically coupled to a balloon inflation orifice (38, 38A, 38B) operable to channel fluid into a balloon; a selectively inflatable external balloon secured to and engirdling a portion of the outer surface wall of the cylindrical shaft and enclosing at least one balloon inflation orifice (38, 38A, 38B), wherein the selectively inflatable external balloon is fluidically coupled to at least one balloon inflation port (36, 36A, 36B, 36C), fluid flow channel (34, 34A, 34B), and fluid inlet (32A, 32B); an internal balloon valve (40B, 40B', 40B", 40B′′′) disposed inside the cylindrical shaft, engirdling a portion of the flow channel wall of the main fluid flow channel and enclosing at least one balloon inflation orifice (38, 38A, 38B), wherein the internal balloon valve (40B, 40B', 40B", 40B"') is fluidically coupled to at least one balloon inflation port (36, 36A, 36B, 36C), fluid flow channel (34, 34A, 34B), and fluid inlet (32A, 32B); wherein the internal balloon valve (40B, 40B', 40B", 40B"'), when inflated, distends a portion of the flow channel wall inwardly such that fluid flow through the main fluid flow channel is restricted except for fluids introduced to main inlet port under pressure; and an outlet port disposed at the distal end fluidically coupled to the main fluid flow channel; characterized in that inflating the internal balloon valve (40B, 40B', 40B", 40B′′′) collapses the flow channel wall until the main fluid flow channel is closed.