Patent ID: 8986253
Filing Date: 2015-03-24
Classification: A61M,F04B

Abstract:
1. A device comprising: a pressurizable, fluid-tight, sealed first chamber, the first chamber comprising a flexible material that is expandable and collapsible depending on a pressure of a pressurized substance within the first chamber to define a variable volume of the first chamber; a second chamber fully enclosed within the pressurized substance of the first chamber for holding a flow material; at least one flow lumen in flow material communication with the second chamber; at least one sensor disposed in the first chamber; a flow controller disposed along the flow lumen; and a microprocessor for calculating flow rate from data provided by the at least one sensor, the flow rate calculation accounting for the variable volume of the first chamber; wherein the first chamber is configured such that when the pressurized substance having a pressure higher than the flow material in the second chamber is in the first chamber, the pressurized substance effects a change of volume of the second chamber; and wherein the microprocessor controls the flow controller.