Electrode device
Disclosed is an electrode device for measuring an electric biosignal. The electrode device includes a flexible PCB (printed circuit board) having a flexible support layer and a trace layer on a first side. The trace layer includes at least two electrode pads for skin contacts and, for each electrode pad, a solder pad and a conducting trace forming a galvanic connection between the electrode and the solder pad. The flexible PCB further includes an opening defining a flexible, elongated cantilever in a central portion of the flexible PCB, having a base end connected to the central portion and a free end separated from the central portion. The solder pads are located at the free end. The electrode device further includes a connector component on the second side, soldered to the solder pads on the free end of the cantilever.
1. An electrode device for measuring an electric biosignal, wherein the electrode device comprises:
a) a flexible PCB (printed circuit board) having
at least a flexible support layer and a trace layer on a first side of the flexible PCB, the trace layer comprising at least two electrode pads for skin contacts and, for each electrode pad, a solder pad and a conducting trace for forming a galvanic connection between the electrode and the solder pad, and
an opening through the layers, wherein the opening defines a flexible, elongated cantilever in a central portion of the flexible PCB such that the flexible cantilever has a base end connected to the central portion and a free end separated from the central portion, wherein the solder pads are located at the free end and the free end bends to a second side of the flexible PCB opposite to the first side, and
b) a connector component on the second side, soldered to the solder pads on the free end of the cantilever,
wherein the trace layer is provided with a gold plating, and the gold-plated trace layer is provided with a solder mask layer that overlaps over the electrode pads in peripheries of the electrode pads such that only gold-plated center portions of the electrode pads are exposable to the skin contact.
2. The electrode device according to claim 1 , wherein,
the flexible PCB is in the form of an elongated strip,
the at least two electrode pads comprise a first electrode pad at one end of the flexible PCB, a second electrode pad on the opposite end of the strip and a third electrode pad between the first and second electrode pad, and
the opening is a U-shaped form located between the first and third electrode pad and opening towards the first electrode pad.
3. The electrode device according to claim 1 , wherein
the connector component is a surface-mount connector component configured to be detachably attached to a corresponding connector component of a portable measurement unit, thereby forming a galvanic connection between the electrode pads and measurement electronics of the measurement unit.
4. The electrode device according to claim 3 , wherein the electrode device further comprises:
c) a docking element on the second side of the flexible PCB for receiving the measurement module therein and holding the measurement module in place when the connector of the electrode device is connected to the connector of the measurement unit.
5. The electrode device according to claim 1 , wherein,
the connector component of the electrode device is a surface-mount standard computer interface connector component, and
at least a portion of the connector component and the free end of the cantilever are both encased in a waterproof, insulating coating.
6. The electrode device according to claim 4 ,
wherein the docking element is in the form of a transparent, flexible loop that encircles the measurement unit when received therein.