Extracorporeal blood processing apparatus and methods with pressure sensing
First Claim
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1. A method for controlling an extracorporeal blood processing system, comprising an extracorporeal blood circuit, in response to fluid pressure changes in a fluid flow in the extracorporeal blood circuit, the method comprising the steps of:
- sensing a fluid pressure in the extracorporeal blood circuit;
comparing the fluid pressure to a threshold value;
stopping fluid flow, when the fluid pressure is below the threshold value;
resuming fluid flow, when the fluid pressure rises to a set point within a selected period of time; and
setting a full alarm condition when the fluid pressure being sensed does not rise above the set point within a selected period of time.
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Abstract
This invention provides an apparatus and method for controlling a fluid separation system, preferably a blood apheresis system, by sensing fluid pressure and comparing the sensed fluid pressure to a threshold value.
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Citations
31 Claims
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1. A method for controlling an extracorporeal blood processing system, comprising an extracorporeal blood circuit, in response to fluid pressure changes in a fluid flow in the extracorporeal blood circuit, the method comprising the steps of:
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sensing a fluid pressure in the extracorporeal blood circuit; comparing the fluid pressure to a threshold value; stopping fluid flow, when the fluid pressure is below the threshold value; resuming fluid flow, when the fluid pressure rises to a set point within a selected period of time; and setting a full alarm condition when the fluid pressure being sensed does not rise above the set point within a selected period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An extracorporeal blood processing apparatus adapted to cooperate with an extracorporeal blood circuit, comprising:
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a fluid pressure-monitoring device for sensing a pressure in an extracorporeal blood circuit; at least one fluid flow control device for circulating at least one liquid in the extracorporeal blood circuit; and a control device for receiving a pressure signal from the pressure monitoring device and comparing it to a threshold value, and for causing the operation of the at least one flow control device, wherein the control device is programmed for; stopping the at least one fluid flow control device), when the fluid pressure sensed by the fluid pressure monitoring device is below the threshold value; resuming the operation of the at least one flow control device, when the fluid pressure sensed by the fluid pressure monitoring device rises above a set point within a selected period of time; and setting a full alarm condition when the fluid pressure sensed by the fluid pressure monitoring device does not rise above the set point within a selected period of time. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification