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Biological signal sensor and device for recording biological signals incorporating the said sensor

  • US 6,996,428 B2
  • Filed: 02/18/2004
  • Issued: 02/07/2006
  • Est. Priority Date: 08/24/2001
  • Status: Expired due to Fees
First Claim
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1. A biological signal sensor comprising:

  • a first, a second and a third electrodes disposed on a common base and made as closed circuits and arranged in one another, the first electrode being disposed externally and the third electrode forming a smaller circuit;

    a fourth electrode disposed inside the smaller circuit, the fourth electrode and the first electrode forming a pair of current-feeding electrodes;

    a sensor of non-rheographic modality disposed on the common base inside an opening in the fourth electrode; and

    a pair of measuring electrodes formed by the second and the third electrodes.

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