Patent ID: 8808231
Filing Date: 2014-08-19
Classification: A61M,F04C

Abstract:
1. A method for dispensing first and second active substances at varying flow rates from a programmable pump system to a patient comprising: providing a pump housing defining an interior including a first chamber containing the first active substance, a second chamber containing the second active substance, and a third chamber containing a propellant; dispelling the first active substance from the first chamber at a first flow rate to a catheter fluidly connected to the first and second chambers; dispelling the second active substance from the second chamber at a second flow rate to the catheter; determining whether to actuate a first valve in fluid communication with the first chamber to vary the first flow rate based on a comparison of pressure readings taken by the first and second pressure sensors; and determining whether to actuate a second valve in fluid communication with the second chamber to vary the second flow rate based on a comparison of pressure readings taken by the third and fourth pressure sensors.