Automatic Fluid Container Switching In A Blood Processing System
First Claim
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1. A system for determining when a fluid supply container of a fluid processing apparatus becomes empty, the system comprising:
- a first fluid supply container;
a first scale for measuring the weight of the first fluid supply container and providing a first output signal indicative of the measured weight of the first fluid supply container;
a pump for pumping fluid from the first fluid supply container;
a controller configured to receive the first output signal from the first scale,to determine the rate of change in weight of the first fluid supply container, and to determine that the first fluid supply container is empty when the rate of change becomes substantially zero and the first fluid supply container weight is below a first pre-established threshold.
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Abstract
Systems and methods for determining when a fluid supply container of a blood processing apparatus becomes empty. The system uses a scale to monitor and detect when a fluid supply container is empty based on the rate of change of the container weight and whether the container weight is below a pre-established threshold, and a controller receives a signal from the scale and controls the operation of a pump to stop pumping when the fluid supply container is empty.
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Citations
20 Claims
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1. A system for determining when a fluid supply container of a fluid processing apparatus becomes empty, the system comprising:
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a first fluid supply container; a first scale for measuring the weight of the first fluid supply container and providing a first output signal indicative of the measured weight of the first fluid supply container; a pump for pumping fluid from the first fluid supply container; a controller configured to receive the first output signal from the first scale, to determine the rate of change in weight of the first fluid supply container, and to determine that the first fluid supply container is empty when the rate of change becomes substantially zero and the first fluid supply container weight is below a first pre-established threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 18)
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8. A system for determining when a fluid supply container of a fluid processing apparatus becomes empty, the system comprising:
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a first fluid supply container; a first scale for measuring the weight of the first fluid supply container and providing a first output signal indicative of the measured weight of the first fluid supply container; a pump for pumping fluid from the first fluid supply container; a controller configured to receive the first output signal from the first scale, and to determine the rate of change in weight of the first fluid supply container, means for determining the rate of fluid flow from the pump; the controller further configured to determine that the first fluid supply container is empty when the ratio of the rate of change in weight of the first fluid supply container to the rate of fluid flow from the pump is less than a predetermined value and the weight of the first fluid supply container is less than a first pre-established threshold. - View Dependent Claims (9, 10, 16, 19)
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11. A method of determining when a fluid supply container of a fluid processing system becomes empty, the method comprising:
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providing a first fluid supply container adapted to be in communication with a patient when a first valve is in an open condition; monitoring the weight of the first fluid supply container while it is being emptied by a pump that is pumping fluid from the first fluid supply container into the patient; establishing a first threshold weight for the first fluid supply container; determining a rate of change of the weight of the first fluid supply container; determining when the rate of change of the weight of the first fluid supply container becomes substantially zero and the weight of the first fluid supply container is less than the first threshold weight; and stopping the operation of the pump when the rate of change of the weight of the first fluid supply container is determined to be substantially zero and the weight of the first fluid supply container is less than the first threshold weight. - View Dependent Claims (12, 13, 14, 17, 20)
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Specification