Patent ID: 8152751

Claim:
An access disconnection system comprising: a blood treatment unit including a blood treatment unit housing; a board separate from the blood treatment unit housing; an arterial line, a portion of the arterial line positioned on the board; a venous line, a portion of the venous line positioned on the board; a transmitter positioned on the board and configured to transmit a sound wave in one of the arterial and venous lines when connected to a patient; a receiver positioned on the board and configured to receive the sound wave from the other of the arterial and venous lines when connected to the patient; and electronic circuitry including a wireless communication apparatus positioned on the board, the electronic circuitry coupled to at least one of the transmitter and receiver, the circuitry configured to send a disconnection output to the blood treatment unit via a wireless signal sent by the wireless communication apparatus, the disconnection output indicative of a change in the sound waves received by the receiver from the transmitter sufficient to expect that an access disconnection of one of the arterial line and venous lines has occurred.