Medical fluid pumping system having real time volume determination
First Claim
1. A medical fluid pumping system comprising:
- a medical fluid pump;
a first pressure chamber separate from and connected fluidly to the medical fluid pump;
a second pressure chamber separate from and connected fluidly to the medical fluid pump;
first and second pressure sensors connected operably to the first and second pressure chambers, respectively;
at least one processor operable with the pressure sensors to calculate a volume of gas in the medical fluid pump prior to a pump-out stroke using a reading from the first pressure sensor after exposing the pump to gas pressure from the first pressure chamber and to use the calculated volume of gas in combination with a known volume of the second pressure chamber and a pressure decay reading taken via the second pressure sensor during the pump-out stroke to calculate at least one volume of fluid pumped during the pump-out stroke; and
wherein the medical fluid pump is exposed to gas pressure from the second pressure chamber to perform the pump-out stroke.
2 Assignments
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Accused Products
Abstract
A medical fluid pumping system includes a medical fluid pump; a first pressure chamber connected fluidly to the medical fluid pump; a second pressure chamber connected fluidly to the medical fluid pump; first and second pressure sensors connected operably to the first and second pressure chambers, respectively; and at least one processor operable with the pressure sensors to calculate a volume of gas in the medical fluid pump prior to a pump-out stroke using a reading from the first pressure sensor after exposing the pump to gas pressure from the first pressure chamber and to use the calculated volume of gas in combination with a known volume of the second pressure chamber and a pressure decay reading taken via the second pressure sensor during the pump-out stroke to calculate at least one volume of fluid pumped during the pump-out stroke.
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Citations
32 Claims
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1. A medical fluid pumping system comprising:
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a medical fluid pump; a first pressure chamber separate from and connected fluidly to the medical fluid pump; a second pressure chamber separate from and connected fluidly to the medical fluid pump; first and second pressure sensors connected operably to the first and second pressure chambers, respectively; at least one processor operable with the pressure sensors to calculate a volume of gas in the medical fluid pump prior to a pump-out stroke using a reading from the first pressure sensor after exposing the pump to gas pressure from the first pressure chamber and to use the calculated volume of gas in combination with a known volume of the second pressure chamber and a pressure decay reading taken via the second pressure sensor during the pump-out stroke to calculate at least one volume of fluid pumped during the pump-out stroke; and wherein the medical fluid pump is exposed to gas pressure from the second pressure chamber to perform the pump-out stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical fluid pumping system comprising:
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a medical fluid pump; a first pressure chamber separate from and connected fluidly to the medical fluid pump; a second pressure chamber separate from and connected fluidly to the medical fluid pump; first and second pressure sensors connected operably to the first and second pressure chambers, respectively; at least one processor operable with the pressure sensors to calculate a volume of gas in the medical fluid pump prior to a pump-out stroke using a reading from the first pressure sensor after exposing the pump to gas pressure from the first pressure chamber and to use the calculated volume of gas in combination with a known volume of the second pressure chamber and a pressure decay reading taken via the second pressure sensor during the pump-out stroke to calculate at least one volume of fluid pumped during the pump-out stroke; wherein the at least one processor is further configured to; (a) calculate a volume of gas in the medical fluid pump after the pump-out stroke using a reading from the first pressure sensor after exposing the pump to gas pressure from the first chamber; and (b) calculate a total volume of fluid pumped via the pump-out stroke by subtracting the volume of gas in the medical fluid pump after the pump-out stroke from the volume of gas in the medical fluid pump prior to the pump-out stroke; and wherein the total volume of fluid pumped via the pump-out stroke is a first total volume, and which includes a second total volume of fluid pumped calculated by the processor using a final pressure decay reading taken via the second pressure senor, the at least one processor further configured to compare the first and second total fluid volumes pumped via the pump-out stroke. - View Dependent Claims (32)
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16. A medical fluid pumping system comprising:
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a medical fluid pump; a pressure chamber connected fluidly to the medical fluid pump; a pressure sensor connected operably to the pressure chamber; and at least one processor operable with the pressure sensor to calculate at least one volume of fluid pumped during a pump-out stroke Vfluid,t according to an equation
Vfluid,t=(Ppress, initial/Ppress,t−
1)(Vpress+Vgas), wherein(i) Ppress,initial is an initial pressure of the pressure chamber prior to the pump-out stroke; (ii) Ppress,t is a pressure of the pressure chamber at a time t during the pump-out stroke; (iii) Vpress is a known volume of the pressure chamber; and (iv) Vgas is a volume of gas in the medical fluid pump prior to the pump-out stroke. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A medical fluid pumping system comprising:
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a medical fluid pump; a pressure chamber connected fluidly to the medical fluid pump; a pressure sensor connected operably to the pressure chamber; and at least one processor operable with the pressure sensor to calculate at least one volume of fluid pumped during a pump-fill stroke Vfluid,t according to an equation
Vfluid,t=(Ppress, initial/Ppress,t−
1)(Vpress+Vgas), wherein(i) Ppress,initial is an initial negative pressure of the pressure chamber prior to the pump-fill stroke; (ii) Ppress,t is a negative pressure of the pressure chamber at a time t during the pump-fill stroke; (iii) Vpress is a known volume of the pressure chamber; and (iv) Vgas is a volume of gas in the medical fluid pump under negative pressure prior to the pump-fill stroke. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification