SYSTEM FOR CALCULATING A CHANGE IN FLUID VOLUME IN A PUMPING CHAMBER
    9.
    发明申请
    SYSTEM FOR CALCULATING A CHANGE IN FLUID VOLUME IN A PUMPING CHAMBER 审中-公开
    计算泵送液体流量变化的系统

    公开(公告)号:WO2015188154A8

    公开(公告)日:2017-01-19

    申请号:PCT/US2015034570

    申请日:2015-06-05

    Abstract: Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections of the apparatus being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of a diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber. Improved heater control circuitry is also disclosed, to provide added or redundant safety measures, or to reduce current leakage from a heater element during pulse width modulation control of the heater. Improvements are also disclosed in the application of negative pressure during a drain phase in peritoneal dialysis therapy, and to control the amount of intraperitoneal fluid accumulation during a therapy. Improvements in efficiency are also disclosed in the movement of fluid into and out of a two-pump cassette and heater bag of a peritoneal dialysis cycler, and in the synchronization of the operation of two or more pumps in a peritoneal dialysis cycler or other fluid handling devices using a multi-pump arrangement.

    Abstract translation: 一般来说,对气动驱动的隔膜泵公开了流体体积测量系统的改进,特别是使用泵盒的腹膜透析循环仪。 泵流体体积测量基于泵室控制室中的压力测量和双室模型中的参考室,其中该设备的不同部分使用绝热,等温和多变过程的组合进行建模。 还公开了在隔膜泵的泵室中的实时或瞬时流体流量测量,在这种情况下使用单室理想气体模型并且使用高速处理器在流体流入或流出期间获得和处理泵控制室压力 的泵室。 还公开了改进的加热器控制电路,以在加热器的脉冲宽度调制控制期间提供附加的或冗余的安全措施,或减少来自加热器元件的电流泄漏。 在腹膜透析治疗期间在排水阶段中施加负压并且在治疗期间控制腹膜内液体积累的量也公开了改进。 流体进出腹膜透析循环仪的双泵盒和加热袋,以及在腹膜透析循环仪或其他流体处理中两个或多个泵的操作的同步中也公开了效率的改善 使用多泵排列的装置。

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