Patent ID: 7558624

Claim:
An apparatus for reverse iontophoresis configured such that it is contacted with a specimen comprising: a base; a conductive locating pin provided on the base; an on-base electrode provided on the base; an electrolytic gel provided on the on-base electrode adapted for contacting a first part of the specimen, and for extracting a molecule from the first part of the specimen; a sensor chip disposed on the base and underneath the electrolytic gel, the sensor chip comprising a chip base having a locating hole, a pigment membrane disposed on the chip base and containing a pigment that changes color by reaction with the molecule, an on-chip electrode being disposed over the locating hole and adapted for electrically connecting to the conductive locating pin through the locating hole and for contacting a second part of the specimen; a light source irradiating light on the pigment membrane through an observation opening in the chip base; and a light sensor receiving a reflection of the light from the pigment membrane through the observation opening in the chip base.