Wearable device for bioelectrical interaction with motion artifact correction means
The invention relates to a wearable device arranged for enabling a bioelectrical interaction with an individual when being brought into contact with the individual's skin I, said device comprising electrodes 2 arranged to carry out said interaction by means of a first electrical signal, said electrodes comprise motion artifact detection means 4. The electrode assembly 1 comprises electrode 2 arranged to carry out a bioelectrical interaction with the individual by means of measuring an electrical signal on the body of the individual I and/or applying an electrical signal to the body of the individual. In order to enable said bioelectrical interaction the electrode 2 is provided with an electrical cable 2 a. According to the invention, the electrode 2 is arranged with a pr 4. The pressure sensor 4 is arranged to measure a normal force component of an external force applied to the electrode due to movement of the individual. Preferably the pressure sensor 4 is a force/pressure sensitive resistor or a capacitive pressure sensor. The pressure sensor is arranged to produce an electrical signal, referred to as the second signal, the magnitude of the second signal being proportional to the pressure load. The pressure sensor 4 is arranged with cables 4 a, 4 b for purposes of signal proce
1. A wearable device arranged for enabling a bioelectrical interaction with an individual by means of a first signal, said device comprising:
an electrode having a contact surface arranged to be brought into contact with the individual's skin for carrying out said interaction, the electrode comprising motion artifact detection means having a thin film pressure sensor arranged on a rear surface of the electrode, said rear surface being opposite the contact surface, wherein the motion artifact detection means is arranged to determine a component normal to the contact surface of an external force applied to the electrode under operating conditions, said motion artifact detection means being arranged to provide a second signal and comprising motion artifact correction means to process the second signal in order to correct the value of the first signal for a motion artifact.
2. A wearable device according to claim 1 , wherein the device comprises control means arranged to analyze the second signal , said control means being further arranged to actuate the motion artifact correction means upon an occurrence of a predetermined event.
3. A wearable device according to claim 2 , wherein the device comprises means for deriving the occurrence of the predetermined event from the second signal.
4. A wearable device according to claim 1 , wherein the motion artifact correction means comprises a linearization element, said linearization element being arranged to correct for a non-linearity in a relation between an absolute value of the second signal and the external force.
5. A wearable device according to claim 1 , wherein the electrodes are of a dry type.
6. An electrode assembly comprising:
an electrode having a contact surface, the assembly being arranged to enable a bioelectrical interaction with an individual by means of a first signal when the contact surface is brought in contact with the individual's skin, said electrode assembly comprising motion artifact detection means having a thin film pressure sensor arranged on a rear surface of the electrode, said rear surface being opposite the contact surface, wherein the motion artifact detection means is arranged to determine a component normal to the contact surface of an external force applied to the electrode under operating conditions, said motion artifact detection means being arranged to provide a second signal, related to the external force.