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US 8,408,421 B2Granted
Flow regulating stopcocks and related methods
AssigneeTandem Diabetes Care, Inc.
InventorPaul M DiPerna
Life of this patent
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Abstract
A dispenser using a stopcock valve has a first and second chamber. The first chamber has a flow material and is pressurized with air. The first chamber is connected to a stopcock valve that holds a second chamber which has a pressure sensor when the stopcock valve is rotated to the proper orientation. The stopcock valve is then rotated to a dispensing position where the flow material is dispensed under pressure to an outlet. By using the air pressure sensor and by taking into consideration the volume of the second chamber, the amount of flow of material can be dosed out consistently.
Claims9
A flow regulating device comprising:
- a first chamber;
- a first compressible member configured to store energy disposed in the first chamber;
- a stopcock;
- a second chamber disposed inside the stopcock for holding flow material to be dispensed;
- a second compressible member configured to store energy disposed in the second chamber;
- a first chamber/stopcock conduit disposed between the first chamber and the stopcock to provide fluid communication therebetween;
- a first pressure sensor in communication with the first chamber;
- and
- wherein the second chamber is filled with flow material from first chamber when stopcock is in a first position and the stopcock device only dispenses flow material when the stopcock is in the second position that is not in fluid communication with the first chamber.
6 more elements
Dependencies are inferred from the claim text.