| 摘要 |
PURPOSE:To obtain an accurate and reproducible contraction/extention ratio of a bellows in a bellows pump which suctions and discharges medical liquid by providing an electric control system for controlling motion velocity of a driving mechanism which contracts/extends the bellows. CONSTITUTION:Contraction/extention velocity of a bellows 1 made of stainless steel, teflon or the like is determined by adjusting an amount of air flowing into an air cylinder 5 as a driving mechanism by means of a cylinder driving air control device 6, for example, a solenoid driving needle. The needle of the cylinder driving air control device is controlled based on a signal from an air control device controller 7 to throttle an exhaust rate of the air and thereby to set the contraction/extention velocity of the bellows 1 through a piston 4 with accuracy and reproducibility. As a result, medical liquid suctioned from a medical liquid suction line 3 is discharged from a medical liquid discharging line 2 with an accurate discharge rate. |
