| 摘要 |
<p>A two-stroke pumping device for developing pulsatile fluid flow includes a housing with an internal resilient flexible element (66). The flexible element defines a pair of chambers within the housing, including a pumping chamber (62) and a driving chamber (64). The pumping chamber is connected to a source of the fluid to be pumped and the driving chamber is connected to a pneumatic pressure source adapted to create a pressure differential across the flexible element. The device includes a means responsive to the flexure of the element in the ejection stroke to terminate that stroke and begin the filling stroke. The flexible element oscillates to generate repetitive ejection and filling strokes.</p> |
