Cartridge device for blood analysis
A cartridge device having a receiving portion for receiving a blood sample and a jack portion for receiving a plug; a stirring device for circulating the blood sample within the receiving portion; and an electrode holder having at least one incorporated electrode wire pair; wherein the electrode holder is attachable to the cell such that one end of the at least one electrode wire pair forms a sensor unit for measuring the electrical impedance between the two electrode wires of the at least one electrode wire pair within the blood sample and that the opposite end of the at least one electrode wire pair forms a plug portion being connectable directly to the plug for an electrical connection of the sensor unit to an analyser.
1. Cartridge device for analysing blood comprising:
(a) a cell having a blood receiving portion for receiving a blood sample and a plug or jack receiving portion being adjacent to the blood receiving portion for receiving a plug or a jack;
(b) means for circulating said blood sample within said blood receiving portion; and
(c) an electrode holder having at least one incorporated electrode pair;
wherein the electrode holder is attachable to the cell such that one end of the at least one electrode pair is positioned inside the blood receiving portion of the cell and forms a sensor unit for measuring the electrical impedance between the two electrodes of the at least one electrode pair within said blood sample and that the opposite end of the at least one electrode pair is positioned inside the plug or jack receiving portion of the cell to form a plug or jack portion of the at least one electrode pair that is connectable directly to a plug or a jack on an analyzer for an electrical connection of the sensor unit to the analyzer.
2. Cartridge device according to claim 1 , wherein the cell is made as a one-piece cell by injection moulding and is made of a blood compatible material selected from the group consisting of polystyrene, polymethyl methacrylate, and polyethylene.
3. Cartridge device according to claim 1 wherein the receiving portion has a cylindrical shape with one open face side.
4. Cartridge device according to claim 1 , wherein the receiving portion has one open face side, and an at least partly conical formed funnel tube is connected to the open face side of the receiving portion for filling in the blood sample.
5. Cartridge device according to claim 4 , wherein two guiding rails are positioned on the inner surface of the funnel tube for guiding the electrode holder into position.
6. Cartridge device according to claim 4 wherein a stopping wall is positioned between the funnel tube and the jack portion for positioning the electrode holder into a stable position.
7. Cartridge device according to claim 1 , wherein the electrode holder is made of a blood compatible material selected from the group consisting of polystyrene, polymethyl methacrylate, and polyethylene, comprises a plastic body which is made by injection moulding, and has a thickness of about 1to 5 mm.
8. Cartridge device according to claim 1 , wherein the electrode holder comprises a L-formed body with a long part and a short part perpendicular to the long part.
9. Cartridge device according to claim 1 , wherein two electrode pairs are symmetrically incorporated in the electrode holder for two independent separate measurement results.
10. Cartridge device according to claim 1 , wherein three electrode pairs are linear incorporated in the electrode holder for three separate measurement results, wherein one electrode pair is preferably positioned in the middle of the remaining electrode pairs for comparing platelet adhesion and aggregation under varying flow conditions.
11. Cartridge device according to claim 1 , wherein four electrode pairs are linear incorporated in the electrode holder for four separate measurement results for making a double-determination of platelet aggregation under low and high blood flow conditions.
12. Cartridge device according to claim 1 , wherein at least three electrode pairs are arranged symmetrically to each other at the same radial position in the receiving portion.
13. Cartridge device according to claim 1 , wherein the two electrodes of one electrode pair are positioned parallel to each other and spaced apart from each other.
14. Cartridge device according to claim 1 , wherein two electrode pairs are positioned parallel to each other and spaced apart from each other.
15. Cartridge device according to claim 1 , wherein the electrodes are formed as wires made of a first material comprising a high conductivity, which is covered by a second material comprising a high electrical conductivity and being resistant against oxidation.
16. Cartridge device according to claim 15 , wherein the first material is selected from the group consisting of copper, copper alloy, copper-silver alloy, copper-magnesium alloy, and a silver-copper alloy comprising 0.2 to 2% silver.
17. Cartridge device according to claim 15 , wherein the second material is a precious metal selected from the group consisting of silver, platin, gold, and a silver coating in the range of about 0.5 to 20 g/kg.
18. Cartridge device according to claim 1 , wherein the at least one electrode pair comprises electrode wires having a diameter of about 0.1 to 0.5 mm.
19. Cartridge device according to claim 1 , wherein the means for circulating includes a stir bar, which is made of steel, siliconized steel, polytetrafluoroethylene or polytetrafluoroethylene-coated, or siliconized stainless steel, wherein the stir bar is actuated by permanent magnets.
20. Cartridge device according to claim 1 , wherein the plug is a standard RJ12 plug.