Hemodialysis device

• US 7,537,687 B2
• Filed: 10/07/2005
• Issued: 05/26/2009
• Est. Priority Date: 10/15/2004
• Status: Active Grant

• Current Assignee: Nikkiso Company Limited
• Original Assignee: Nikkiso Company Limited
• Inventors: Takakuwa, Yasushi, Toyoda, Masahiro
• Primary Examiner(s): Cecil; Terry K
• Application Number:
  US11/246,385
• Publication Number:
  US 20060081517A1
• Time in Patent Office: 1,327 Days
• Field of Search: 604/5.04, 604/6.09, 604/6.08, 604/6.11, 210/85, 210/645, 210/646, 210/647, 210/321.71, 210/321.6
• US Class Current: 210/85
• CPC Class Codes: A61M 1/3656 Monitoring patency or flow at connection sites; Detecting disconnections
• CPC Class Codes: A61M 1/3669 Electrical impedance measurement of body fluids; transducers specially adapted therefor
• CPC Class Codes: A61M 1/367 Circuit parts not covered by the preceding subgroups of group A61M1/3621
• CPC Class Codes: A61M 2205/13 with means for the detection of operative contact with patient, e.g. lip sensor

Abstract

A hemodialysis device includes a hemodialysis device main body including an arterial blood circuit, venous blood circuit, blood pump, dialyzer, dialysate inlet and outlet lines, voltage adding device, electric potential measuring device, and monitoring device monitoring the needle when it is detached from the patient based on an electric potential measured by the electric potential measuring device. One electrode of the voltage adding device is attached between an arterial blood needle in the arterial blood circuit and the pump, and another electrode is attached to the dialysate outlet line. The hemodialysis device allows the precise detection of a needle that is detached from a patient taking a blood hemodialysis treatment by monitoring a voltage difference at a predetermined position while providing voltage to the blood flowing in the blood circuit. The device also allows the suppression of an increase in production cost for a disposable blood circuit.

Claims

1. A hemodialysis device for purifying blood collected from a patient comprising;

a blood circuit comprising an arterial blood circuit and a venous blood circuit which circulates the blood extracorporeally;

a blood pump disposed in the arterial blood circuit;

a blood purification device that is connected between the arterial blood circuit and the venous blood circuit and purifies the blood flowing in the blood circuit;

a main body having a dialysate inlet line and a dialysate outlet line which inlet and outlet dialysate to and from the blood purification device, respectively;

a voltage adding device comprising one electrode and another electrode adding voltage to the blood flowing in the blood circuit between the electrodes;

a measuring device detecting electric potentials of at least two positions accompanying the voltage added by the voltage adding device; and

a monitor calculating a calculated electric potential by comparing each electric potential detected by the measuring device and monitoring a detachment of an arterial blood needle or a venous blood needle from the patient;

wherein one electrode of the voltage adding device is disposed between the arterial blood needle in the arterial blood circuit and the blood pump and the other electrode is disposed in the dialysate inlet line or the dialysate outlet line.

2. A hemodialysis device according to claim 1, wherein the measuring device measures an electric potential of the one electrode or the other electrode in said voltage adding device.

3. A hemodialysis device according to claim 2, wherein said voltage adding device or said measuring device directly contacts the blood or the dialysate to add the voltage or detect the electric potential.

4. A hemodialysis device according to claim 2, wherein said monitor calculates the calculated electric potential by extracting a frequency component of at least one of the electric potentials measured by the measuring device.

5. A hemodialysis device according to claim 1, wherein said voltage adding device or said measuring device directly contacts the blood or the dialysate to add the voltage or to detect the electric potential.

6. A hemodialysis device according to claim 5, wherein said monitor calculates the calculated electric potential by extracting a frequency component of at least one of the electric potentials measured by the measuring device.

7. A hemodialysis device according to claim 1, wherein said monitor calculates the calculated electric potential by extracting a frequency component of at least one of the electric potentials measured by the measuring device.

8. A hemodialysis device for purifying blood collected from a patient comprising;

a blood circuit comprising an arterial blood circuit and a venous blood circuit which circulates the blood extracorporeally;

a blood pump disposed in the arterial blood circuit;

a blood purification device that is connected between the arterial blood circuit and the venous blood circuit and purifies the blood flowing in the blood circuit;

a main body having a dialysate inlet line and a dialysate outlet line which inlet and outlet dialysate to and from the blood purification device, respectively;

a voltage adding device comprising one electrode and another electrode adding voltage to the blood flowing in the blood circuit between the electrodes;

a measuring device detecting electric potentials of at least two positions accompanying the voltage added by the voltage adding device; and

a monitor calculating a calculated electric potential by comparing each electric potential detected by the measuring device and monitoring a detachment of an arterial blood needle or a venous blood needle from the patient;

wherein one electrode of the voltage adding device is disposed between the arterial blood needle in the arterial blood circuit and the blood pump and the other electrode is disposed in the dialysate inlet line or the dialysate outlet line.

9. A hemodialysis device according to claim 8, wherein the measuring device measures an electric potential of the one electrode or the other electrode in said voltage adding device.

10. A hemodialysis device according to claim 8, wherein said voltage adding device or said measuring device directly contacts the blood or the dialysate to add the voltage or detect the electric potential.

11. A hemodialysis device according to claim 8, wherein said monitoring device calculates the calculated electric potential by extracting a frequency component of at least one of the electric potentials measured by the measuring device.