Device for measuring sugar concentration

• US 4,140,963 A
• Filed: 03/07/1977
• Issued: 02/20/1979
• Est. Priority Date: 01/03/1972
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Rao, Raghavendra, VON Sturm, Ferdinand
• Primary Examiner(s): Tokar, M.
• Application Number:
  US05/775,186
• Time in Patent Office: 715 Days
• Field of Search: 429/2, 429/12, 429/15, 128/2 P, 128/2 E, 128/2.1 E, 128/419 B, 324/62, 324/30 R, 324/29
• US Class Current: 324/442
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement

Abstract

A device for measuring sugar concentration, particularly in a body liquid, for example, blood of a patient is characterized in that an electrochemical glucose cell is used to produce an electrical signal corresponding to the sugar concentration.

Claims

1. Apparatus for measuring sugar concentration of human blood, comprising a cell (22) combining an electrode (25) composed of platinized platinum as the glucose electrode with at least one carbon catalyst electrode (23, 24) permeable to glucose, as the oxygen electrode, and a current sensing means coupled to said cell (22), the cell (22) itself is constructed so as to supply current to the current sensing means coupled to said cell (22) for providing an accurate measure of said sugar concentration.

2. Apparatus according to claim 1 with the cell (22) providing a cell idle voltage (U_ZL), said current sensing means comprising a volt meter (26, 27, 10) for determining the cell idle voltage (U_ZL) connected to the electrodes (25, 23, 24) of the cell (22).

3. Apparatus according to claim 1, with the electrodes (25, 23, 24) of the cell (22) being loaded with a resistance (28) of at least about twenty kilohms, and said current sensing means comprising a meter (26 through 28) selectively connected to the electrodes.

4. Apparatus according to claim 1, with a switch (6) connecting the electrodes (25, 23, 24) of the cell (22) to a resistance (29) of not more than about two hundred ohms, said current sensing means comprising a volt meter with a limit value indicator (17, 18) connected to the electrodes for sensing a transition time period of the cell voltage.

5. Apparatus for measuring sugar concentration of human blood, comprising a cell (22) combining a glucose-electrode composed of platinum with at least one counter electrode composed of silver/silverchloride, a current sensing means coupled to said cell (22), the cell (22) itself is constructed so as to supply current to the current sensing means for providing an accurate measure of said sugar concentration.

6. Apparatus according to claim 5, with the cell providing a cell idle voltage (U_ZL), said current sensing means comprising a volt meter (26, 27, 10) for determining the cell idle voltage (U_ZL) connected to the electrodes (25, 23, 24) of said cell (22).

7. Apparatus according to claim 5, with the electrodes (25, 23, 24) of the cell (22) being loaded with a resistance (28) of at least about twenty kilohms, and said current sensing means comprising a meter (26 through 28) selectively connected to the electrodes.

8. Apparatus according to claim 5, with a switch (6) connecting the electrodes (25, 23, 24) of the cell (22) to a resistance (29) of not more than about two hundred ohms, said current sensing means comprising a volt meter with a limit value indicator (17, 18) connected to the electrodes for sensing a transition time period of the cell voltage.