An electromechanical surgical system (10), comprising: a hand-held surgical instrument (100) that includes an instrument housing (102) defining a connection part (108a) for selectively connecting with a set of trees (200), having the surgical instrument at least one rotary impeller member (118, 120, 122)； and an end effector (400) configured to perform at least one function； and the set of trees (200) is arranged to selectively interconnect the final effector (400) and the surgical device, including the set of trees: a transmission housing (212) configured and adapted for selective connection to the connecting part ( 108a) of the surgical device and to be in operative communication with each of the at least one rotating impeller member (118, 120, 122) of the surgical device； an outer tubular body (210) having a proximal end (210a) supported by the transmission housing (212) and a distal end (210b) configured and adapted for the operative connection with the final effector (400)； an articulation neck assembly (230) interconnecting the tubular body (210) and a distal neck housing (236) comprised in the articulation neck assembly, wherein the articulation neck assembly is configured to allow articulation outside of the axis of the distal neck housing； the distal neck housing (236) interconnects a rotary impeller member (118, 120, 122) of the surgical instrument and a rotating receiver member (426) supported in the final effector, wherein the distal neck housing (236) includes a first end that is connectable to the rotary impeller member of the surgical instrument and a second end that is connectable to the rotary receiving member of the end effector, wherein the distal neck housing transmits a rotation of the rotary impeller member of the surgical instrument to the rotation receiving member of the final effector, including the distal neck housing: at least one gear system comprising a first or proximal planetary gear system (280) that includes at least a first satellit
