Computer controlled positive displacement pump for physiological flow simulation
First Claim
1. A positive displacement pump, comprising:
- a) a reservoir for storing fluid;
b) cylinder means comprising a single tube for receiving and discharging fluid from opposite ends thereof;
c) piston means within said cylinder means for forcing said fluid into and out of said opposite ends of said cylinder means;
d) a four-way valve having an inlet port connected to said reservoir, a pair of bidirectional ports connected to said opposite ends of said cylinder means, and an outlet port; and
e) means for receiving a user flow waveform expressed in terms of a predetermined flow rate as a function of time and in response moving said piston and configuring said four-way valve to provide fluid flow from said reservoir through said valve into one of said opposite ends of said cylinder means, and from the other one of said opposite ends of said cylinder means through said valve to said outlet port in accordance with said user flow waveform.
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Accused Products
Abstract
A positive displacement pump includes a reservoir for storing fluid, a cylinder for receiving and discharging the fluid and a piston within the cylinder for forcing the fluid into and out of the cylinder. The pump further includes a four-way valve having an inlet port connected to a reservoir, a pair of bidirectional ports connected to the opposite ends of the cylinder and an outlet port. Mechanisms are provided for receiving a user flow waveform expressed in terms of predetermined flow rate as a function of time and in response moving the piston and configuring the four-way valve to provide fluid flow from the reservoir through the valve and into one of the opposite ends of the cylinder, and from the other one of the opposite ends of the cylinder through the valve to the outlet port in accordance with the user flow waveform.
91 Citations
19 Claims
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1. A positive displacement pump, comprising:
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a) a reservoir for storing fluid; b) cylinder means comprising a single tube for receiving and discharging fluid from opposite ends thereof; c) piston means within said cylinder means for forcing said fluid into and out of said opposite ends of said cylinder means; d) a four-way valve having an inlet port connected to said reservoir, a pair of bidirectional ports connected to said opposite ends of said cylinder means, and an outlet port; and e) means for receiving a user flow waveform expressed in terms of a predetermined flow rate as a function of time and in response moving said piston and configuring said four-way valve to provide fluid flow from said reservoir through said valve into one of said opposite ends of said cylinder means, and from the other one of said opposite ends of said cylinder means through said valve to said outlet port in accordance with said user flow waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification