Patent ID: 8591456
Filing Date: 2013-11-26
Classification: A61M,F04C

Abstract:
1. A programmable pump system for dispensing first and second active substances at varying flow rates to a patient comprising: 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; a first valve in fluid communication with the first chamber; a second valve in fluid communication with the second chamber; a catheter fluidly connected with the first and second chambers, wherein expansion of the propellant within the third chamber causes the first active substance to flow from the first chamber at a first flow rate towards the catheter and the second active substance to flow from the second chamber at a second flow rate towards the catheter, actuation of the first valve varies the first flow rate, and actuation of the second valve varies the second flow rate; and first and second pressure sensors associated with the first chamber and third and fourth pressure sensors associated with the second chamber, wherein a comparison of pressure readings taken by the first and second pressure sensors determines whether the first valve should be actuated and a comparison of pressure readings taken by the third and fourth pressure sensors determines whether the second valve should be actuated.