Patent ID: 7648476
Filing Date: 2010-01-19
Classification: A61M

Abstract:
1. A blood treatment apparatus comprising: a blood circulator; a dialysate circulator; sensors for monitoring parameters; actors programmed to effect changes in the circulators; a controller programmed to detect alarm conditions for monitoring signals supplied from the sensors and for controlling the actors, each of the alarm conditions associated with a respective one of two or more different alarm stages; a first alarm system controlled by the controller; a supervisor programmed to detect alarm conditions for monitoring the controller; a second alarm system controlled by the supervisor; and a function monitoring device coupled to the controller and to the supervisor, wherein, upon detection of an alarm condition by the supervisor, the supervisor is programmed to activate the first alarm system if the controller does not detect the alarm condition, is programmed to activate the second alarm system if the first alarm system fails to operate, is programmed to activate the second alarm system if the first alarm system actively presents an incorrect alarm stage not associated with the alarm condition, and is programmed to not activate the second alarm system if the first alarm system operates correctly based at least in part on an input from the function monitoring device.