The utility model discloses a sacculus guiding device that is used for protruding plastic operation behind pedicle of vertebral arch approach centrum, it is including the guide silk, the sleeve pipe, the sacculus, the sacculus setting is at the sleeve pipe front end and pass through the hose connection, have the memory alloy section on the guide silk, it sets up in the hose of sleeve pipe and sacculus junction, the sleeve pipe includes inner tube I, the outer tube, guide silk entry, liquid inlet, the outer tube suit is outside inner tube I, guide silk entry sets up and communicates at the sleeve pipe tip and with inner tube I, liquid inlet sets up in sleeve pipe one side and communicates with the outer tube, set up inner tube II in the utricule of sacculus, outer tube and utricule intercommunication, inner tube I and II intercommunications of inner tube, guide silk sets up in inner tube I and inner tube II, utilize memory alloy's characteristic, messenger's guide silk pushes down the condensation diastole in the different temperatures, drives the sacculus and buckles to the offside centrum, makes the sacculus can strut the offside centrum as far as, is wherein establishhing bone cement support space, under the condition that reduces the operation wound, reach the effect that expansion and balanced bone cement supported the space.