Patent ID: 9393388
Filing Date: 2016-07-19
CPC Classification: A61B,A61M

Claim Text:
1. A control system to regulate fluid flow in a patient, comprising: a fluid chamber having an inlet port to receive a bodily fluid and an outlet port to discharge the received bodily fluid; a pressure chamber separated and substantially sealed from the fluid chamber; a pressure element configured to sense a first pressure of the bodily fluid in the fluid chamber, and to sense a second pressure of the pressure chamber opposing the first pressure, wherein the pressure chamber is configured such that the second pressure is an absolute pressure reference independent of pressure differences within the patient's body; and a valve member to regulate the amount of fluid discharged from the outlet port based on a comparison of the first pressure to the absolute pressure reference, wherein the pressure chamber includes a vent connected to a dry volume to reduce back pressure effects on the absolute pressure reference when the valve member opens the outlet port.