Blood purification device

Abstract

To provide a blood purification device that can accurately determine whether a venipuncture has been performed correctly in a patient. [Solution] The blood purification device 1 comprises a blood purifier 3 capable of purifying blood, a blood circuit 2 having an arterial blood circuit 21 with an arterial puncture needle 211 attached to its tip and a venous blood circuit 22 with a venous puncture needle 221 attached to its tip, an impedance measuring unit 5 having an oscillator 53 that applies an AC voltage between an arterial electrode 51 provided on the arterial blood circuit 21 and a venous electrode 52 provided on the venous blood circuit 22, and capable of measuring the frequency characteristics of the impedance between the arterial electrode 51 and the venous electrode 52, and a puncture determination unit 72 that determines whether the patient has been properly punctured based on the measured impedance frequency characteristics, and further comprises a frequency range determination unit 70 that determines the frequency range of the AC voltage applied by the oscillator 53 according to the liquid in the blood circuit 2.

Claims

1. A blood purifier capable of purifying blood, A blood circuit for extracorporeal circulation of the patient's blood has an arterial blood circuit with an arterial puncture needle attached to its tip and its base connected to the blood purifier, and a venous blood circuit with a venous puncture needle attached to its tip and its base connected to the blood purifier, An impedance measuring unit having an oscillator that applies an AC voltage between the arterial electrode provided in the arterial blood circuit and the venous electrode provided in the venous blood circuit, and capable of measuring the frequency characteristics of the impedance between the arterial electrode and the venous electrode, The system includes a puncture determination unit that determines whether the patient has been properly punctured based on the frequency characteristics of the impedance measured by the impedance measurement unit, Furthermore, it includes a frequency range determination unit that determines the frequency range of the AC voltage applied by the oscillator according to the liquid in the blood circuit. Blood purification device.

2. The system includes a hematocrit value detection sensor that detects the hematocrit value of the fluid in the blood circuit, The frequency range determination unit determines the frequency range of the AC voltage applied by the oscillator according to the hematocrit value of the liquid in the blood circuit detected by the hematocrit value detection sensor. The blood purification device according to claim 1.

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