Pulsatile pump
First Claim
1. A pulsatile pump operable to develop two strokes including a filling stroke and an ejection stroke, said pump comprising:
- a housing;
an elastic member within the housing arranged to divide the interior of the housing into a pumping chamber and a driving chamber;
the pumping chamber having an inlet and an outlet, said inlet pumping chamber and outlet defining a flow path for fluid to be pumped;
check valve means for effecting unidirectional flow along the flow path;
said driving chamber having an air inlet and an air outlet;
the air outlet being surrounded by an upstanding wall extending interiorally into the driving chamber, the upper end of the upstanding wall defining a rim about the air outlet;
said elastic member being mounted within the housing so that the elastic member is stretched downwardly over the rim of the upstanding wall thereby effecting a seal against the rim of the upstanding wall, the elastic member being stretched into sealed engagement with the rim and thereby being biased in sealed relation against the rim;
the air inlet communicating with the driving chamber.
2 Assignments
0 Petitions
Accused Products
Abstract
A two-stroke pumping device for developing pulsatile fluid flow includes a housing with an internal resilient flexible element. The flexible element defines a pair of chambers within the housing, including a pumping chamber and a driving chamber. The pumping chamber is connected to a source of the fluid to be pumped and the driving chamber is connected to a pneumatic source adapted to create a pressure differential across the flexible element. The device includes a means responsive to the flexure of the element in one of the strokes to terminate that stroke and begin the other stroke. The flexible element oscillates to generate repetitive ejection and filling strokes. The pneumatic source may be a source of negative or positive pressure.
-
Citations
9 Claims
-
1. A pulsatile pump operable to develop two strokes including a filling stroke and an ejection stroke, said pump comprising:
-
a housing; an elastic member within the housing arranged to divide the interior of the housing into a pumping chamber and a driving chamber; the pumping chamber having an inlet and an outlet, said inlet pumping chamber and outlet defining a flow path for fluid to be pumped; check valve means for effecting unidirectional flow along the flow path; said driving chamber having an air inlet and an air outlet; the air outlet being surrounded by an upstanding wall extending interiorally into the driving chamber, the upper end of the upstanding wall defining a rim about the air outlet; said elastic member being mounted within the housing so that the elastic member is stretched downwardly over the rim of the upstanding wall thereby effecting a seal against the rim of the upstanding wall, the elastic member being stretched into sealed engagement with the rim and thereby being biased in sealed relation against the rim; the air inlet communicating with the driving chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification