Multiple reservoir programmable pump
First Claim
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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.
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Abstract
Different embodiment programmable pumps including multiple reservoirs are disclosed, as are methods of utilizing same. The pumps generally include at least two reservoirs and means for dispensing active substances housed in each at varying flow rates.
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Citations
19 Claims
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1. A programmable pump system for dispensing first and second active substances at varying flow rates to a patient comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification