PROBLEM TO BE SOLVED: To provide an expansion and contraction drive unit for a medical treatment, capable of detecting a lowering factor of the responsiveness of the drive unit.SOLUTION: The drive unit includes: a pressure-generating means 14a, 14b for applying a positive pressure and a negative pressure alternately to a piping system 28 communicating to a driven equipment 30 so that the driven equipment can repeat expansion and contraction due to the flowage of driven fluid a gas replenishing means 60 for replenishing gas to the piping system and a gas concentration detecting means 72 for detecting the gas concentration in the driven fluid in the piping system.COPYRIGHT: (C)2013,JPO&INPIT【課題】駆動装置の応答性の低下要因を検知できる医療用膨張・収縮駆動装置を提供する。【解決手段】駆動流体の流動によって被駆動機器(30)が膨張および収縮を繰り返すように、当該被駆動機器に連通する配管系(28)に、陽圧と陰圧とを交互に印加する圧力発生手段(14a,14b)と、前記配管系にガスを補充するガス補充手段(60)と、前記配管系の前記駆動流体中における前記ガスの濃度を検出するガス濃度検出手段(72)と、を有する医療用膨張・収縮駆動装置。【選択図】図1
