Blood purification device

Abstract

To provide a blood purification device that improves safety. [Solution] The blood purification device 1 comprises a blood circuit 2 for circulating the patient's blood outside the body, a blood purifier 3 provided in the blood circuit 2 capable of purifying the blood, an impedance measuring unit 5 capable of measuring the frequency characteristics of the impedance of the liquid in the blood circuit 2, a normal frequency characteristic storage unit 83 that stores the frequency characteristics of the impedance under normal conditions corresponding to the liquid flowing through the blood circuit 2, and a liquid determination unit 72 that compares the frequency characteristics of the impedance measured by the impedance measuring unit 5 with the frequency characteristics of the impedance under normal conditions stored in the normal frequency characteristic storage unit 83 and determines whether they match.

Claims

1. A blood circuit that circulates the patient's blood outside the body, A blood purifier capable of purifying blood is provided in the aforementioned blood circuit, An impedance measuring unit capable of measuring the frequency characteristics of the impedance of the liquid in the blood circuit, A normal frequency characteristic storage unit stores the frequency characteristics of the impedance under normal conditions corresponding to the fluid flowing through the blood circuit, The system includes a liquid determination unit that compares the frequency characteristics of the impedance measured by the impedance measurement unit with the frequency characteristics of the impedance under normal conditions stored in the normal frequency characteristics storage unit to determine if they match. Blood purification device.

2. The aforementioned normal frequency characteristic memory unit stores the frequency characteristics of the normal impedance for each step of the blood purification treatment, according to the fluid flowing through the blood circuit and whether or not a puncture was performed on the patient. The liquid determination unit, when transitioning from any step of blood purification therapy to the next step, compares the frequency characteristics of the impedance measured by the impedance measurement unit with the frequency characteristics of the impedance during normal operation at the next step, stored in the normal frequency characteristics storage unit, and determines whether they match. The blood purification device according to claim 1.

3. The process transition restriction unit includes a unit that restricts the start of the next process when the liquid determination unit determines that the liquids do not match, and releases the restriction on the start of the next process when the liquid determination unit determines that the liquids match. The blood purification device according to claim 2.

4. The liquid determination unit makes a determination by utilizing the mutual correlation between the resistive component and the capacitive component that constitute the frequency characteristics of the impedance. The blood purification device according to claim 1.

5. The aforementioned blood circuit is An arterial blood circuit with an arterial puncture needle attached to its tip that can be used to puncture the patient, It has a venous blood circuit with a venous puncture needle attached to its tip that can be used to puncture a patient, The impedance measuring unit is The arterial side electrode provided in the arterial side blood circuit, The venous side electrode provided in the venous side blood circuit, An oscillator that applies an alternating current voltage between the arterial electrode and the venous electrode, and whose frequency of the alternating current voltage can be switched, The system includes an impedance measuring device that measures the impedance between the arterial electrode and the venous electrode at each frequency. The blood purification device according to claim 1.

6. A blood circuit that circulates the patient's blood outside the body, A blood purifier capable of purifying blood is provided in the aforementioned blood circuit, An impedance measuring unit capable of measuring the impedance of the liquid in the blood circuit at a predetermined frequency, A normal frequency characteristic storage unit stores the impedance at the predetermined frequency during normal operation, corresponding to the fluid flowing through the blood circuit. The system includes a liquid determination unit that compares the impedance at the predetermined frequency measured by the impedance measurement unit with the impedance at the predetermined frequency during normal operation stored in the normal frequency characteristic storage unit, and determines whether they match. Blood purification device.

Images