Blood circuit for a dialysis machine and corresponding dialysis machine

• US 7,115,107 B2
• Filed: 05/30/2002
• Issued: 10/03/2006
• Est. Priority Date: 06/15/2001
• Status: Expired due to Term

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro Lundia AB (Baxter International Inc.)
• Inventors: Lodi, Carlo Alberto, Delnevo, Annalisa
• Primary Examiner(s): Bianco, Patricia
• Application Number:
  US10/343,856
• Publication Number:
  US 20030130607A1
• Time in Patent Office: 1,587 Days
• Field of Search: 604/4.01, 604 501- 504, 604/6.09, 604/6.11, 604/6.15, 604/6.16, 604/262, 604/246, 604/403, 604408- 10, 141/69, 141/DIG.1, 417/437, 417474-476, 417/477.1, 417/477.2, 417/477.9, 417/477.12, D24/107, D24/111, D24/112, D24127-131, 210/600, 210/739, 210644-646, 128/DIG.24, 383 38- 41, 383/105, 738/614.2, 738/614.7, 738/614.9, 738/615.1, 732/32, 732/62, 206/219, 206/221, 206/222, 206/828, 215379-381, 220500- 1, 220/660, 220/666
• US Class Current: 604/6.15
• CPC Class Codes: A61M 1/3653 Interfaces between patient blood circulation and extra-corporal blood circuit
• 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 2039/1005 Detection of disconnection
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066

Abstract

A blood circuit (1) for a dialysis machine is made form plastic material and is provided with a metallic plate (30), which is applied to an external face of the blood circuit (1) and is connectable to a voltage generator (34) in such a way as to form a capacitor, in which the plate (30) and the blood act as the capacitor plates and the plastic material acts as the dielectric.

Claims

1. A blood circuit comprising:

a first blood expansion chamber constructed of a plastic material, said first blood expansion chamber having a lower portion, configured to house blood when in use, and an upper portion configured to house air;

a first pressure sensor located on said upper portion; and

a first electrically conductive element fixed to an external face of said first blood expansion chamber in the area of said lower portion.

2. The circuit of claim 1, further comprising an arterial branch and a venous branch, said first blood expansion chamber being located in said venous branch.

3. The circuit of claim 2, further comprising:

a second blood expansion chamber located in said arterial branch, said second blood expansion chamber constructed of a plastic material, said second blood expansion chamber having a lower portion, configured to house blood when in use, and an upper portion configured to house air; and

a second pressure sensor located on said upper portion of said second blood expansion chamber.

4. The circuit of claim 3, comprising a second electrically conductive element applied to an external face of said second blood expansion chamber in the area of said lower portion.

5. The circuit of claim 4, wherein said second electrically conductive element comprises plastics embedding electrically conductive bodies.

6. The circuit of claim 5, wherein said electrically conductive bodies comprise fibers, and/or particles, and/or filaments.

7. The circuit of claim 4, wherein said second electrically conductive element comprises a metallic plate.

8. The circuit of claim 4, wherein said first blood expansion chamber and said second blood expansion chamber are integrated in a box made of rigid plastic material;

said box comprising a first principal wall, a second principal wall, and a perimetric wall;

said first pressure sensor, said second pressure sensor, said first electrically conductive element, and said second electrically conductive element being located on an external face of the first principal wall or the second principal wall.

9. The circuit of claim 3, wherein said first blood expansion chamber and said second blood expansion chamber are integrated in a box made of rigid plastic material.

10. The circuit of claim 1, wherein said first electrically conductive element is connectable to a voltage generator forming a capacitor, said first electrically conductive element and blood housed in said lower portion serve as capacitor plates and said plastic material of said first blood expansion chamber serves as a dielectric.

11. The circuit of claim 10, wherein said first electrically conductive element comprises a first electrical connector configured to be coupled to a second electrical connector of said voltage generator.

12. A dialysis machine comprising a blood circuit according to claim 10, and a voltage generator connected to said first electrically conductive element for supplying an electrical current through an electrical circuit comprising said blood circuit, wherein said blood circuit is connected to a patient.

13. The circuit of claim 1, wherein said first electrically conductive element comprises plastics embedding electrically conductive bodies.

14. The circuit of claim 13, wherein said electrically conductive bodies comprise fibers, and/or particles, and/or filaments.

15. The circuit of claim 1, wherein said first pressure sensor is located on said external face of said first blood expansion chamber.

16. The circuit of claim 1, wherein said first electrically conductive element comprises a metallic plate.