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Implantable biosensor and sensor arrangement

  • US 8,323,193 B2
  • Filed: 08/13/2009
  • Issued: 12/04/2012
  • Est. Priority Date: 08/27/2008
  • Status: Active Grant
First Claim
Patent Images

1. An implantable biosensor (2) comprising:

  • a test fluid (104;

    204;

    304);

    a first chamber (102;

    202;

    302) filled with the test fluid (104;

    204;

    304);

    wherein the test fluid (104;

    204;

    304) is configured to convert a change of a concentration of a predetermined analyte or ion type into a change of a physical variable;

    at least one membrane (103;

    203;

    303);

    wherein the first chamber (102;

    202;

    302) is closed by the at least one membrane (103;

    203;

    303);

    wherein the at least one membrane (103;

    203;

    303) is permeable to the predetermined analyte or ion type and impermeable to the test fluid (104;

    204;

    304);

    an antenna;

    at least one microacoustic sensor (105, 107;

    205, 207;

    305), which is operatively connected to the test fluid (104;

    204;

    304) such that it can detect the change of the physical variable that changes with the change of the concentration of the predetermined analyte or ion type wherein said at least one microacoustic sensor is coupled with said antenna and is passive and obtains power via said antenna and wherein said at least one microacoustic sensor comprises a respective resonant frequency and wherein said at least one microacoustic sensor receives a transmission pulse (5) at said respective resonant frequency which is modified by said at least one microacoustic sensor and reflected via said antenna as an electromagnetic echo (6);

    a second chamber (206) not filled with the test fluid (204);

    a first pressure measuring membrane (210);

    wherein the first chamber (202) and said second chamber (206) are separated from each other at least in some sections by the first pressure measuring membrane (210) wherein said first pressure measuring membrane (210) is configured to deform in an event of a pressure difference between said first chamber (202) and said second chamber (206);

    a second pressure measuring membrane (211);

    wherein the second chamber (206) is separated from a surrounding area at least in some sections by the second pressure measuring membrane (211) that is configured to deform in an event of a pressure difference of the second chamber (206) relative to the surrounding area;

    a microacoustic sensor (205) selected from the at least one microacoustic sensor (105, 107;

    205, 207;

    305) wherein said microacoustic sensor (205) is accommodated in the second chamber (206); and

    ,wherein the microacoustic sensor (205) is operatively connected to the first and second pressure measuring membranes (210, 211) such that the microacoustic sensor (205) is configured to detect deformations thereof.

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