An electrode device for electroencephalography

MÉS INFORMACIÓ

Dades d'interès

  • Technology Readiness Level

    Working prototypes

  • Desired business relationship

    Looking for a partner interested in a license and/or a collaboration agreement to develop and exploit this asset.

     

  • Inventors

    Fabregat Sanjuan, Albert; Pascual Rubio, Vicenç

  • Priority Date

    20.04.2020

     

  • Application number

    EP20382317

  • Contact

    valoritzacio@iispv.cat

An electrode device for electroencephalography

Summary of the technology

A specific electrode has been designed for the recording of aEEG in the neonatal and pediatric ICU’s. The new electrode solves the problems of conventional commercial electrodes. The main difference of the new device is a design of suitable dimensions and shape that adapts to the cephalic surface of children and improves its support. It allows a safe replacement of the electroconductive gel, and a manipulation of the child without difficulties.

Most available surface electrodes are not properly sized for term and preterm infant’s application. Also, they are usually attached to a long wire that connects them to the bioelectric signal amplifier. This long wire electrode hinders the manipulation of the newborn by health care staff. In addition, the electrode wire is usually attached laterally to the electrode. In the lying position, the usual position of children in the ICU’s, this joint causes a lever force that facilitates the electrode decoupling.

Superficial cup electrodes available have a hole through which the electroconductive gel is replaced in order to maintain its high conductive capacity during long-term recordings. During this process, a blunt-tipped syringe is usually used to remove the old electroconductive gel and apply the new one. At this time, it is usually necessary to apply vertical pressure to beat the conductive gel layer that may have dried on the long-term recordings. This pressure can cause an involuntary contact with the scalp surface, which should be avoided in newborns due to their fragility and proximity to the fontanelles.

Disposable adhesive electrodes have the disadvantage of not allowing the replacement of the electroconductive gel and therefore they must be replaced periodically. This involves more manipulation and possible changes in the recording conditions (placement, impedance, etc.).
The subdermal needle electrodes which are often used in the aEEG to achieve low impedance recordings have the disadvantage of producing pain. Pain should always be avoided to improve comfort but in the aEEG it also has the disadvantage of not allowing the accurate assessment of a parameter as important as the latency of onset of the asleep-wake cycle. In addition, the subdermal electrodes have the same drawbacks as most surface electrodes available: are connected to a long wire to the amplifier and are easily detached.

  • Challenges that technology addresses

    Conventional surface cup electrodes have a central hole through which the electroconductive gel is replaced during long-term recordings. In this process, a syringe with a blunt metal tip is usually used to replace the electroconductive gel, and a vertical pressure is usually applied to overcome the conductive gel layer that may have dried on the long-term recordings. This pressure can cause involuntary contact with the surface of the scalp, which should be avoided in babies because of its fragility and proximity to the fontanelles. In single-use adhesive electrodes, the gel cannot be replaced and the electrodes must be replaced periodically. This involves greater manipulation and possible changes in recording conditions (placement, impedance, etc.).

    The subdermal needle electrodes used in most neonatal and pediatric ICUs to perform aEEGs have the disadvantage of producing pain. Pain, apart from producing discomfort, also prevents the calculation of the beginning of the wake-sleep cycle. In addition, subdermal electrodes have the same drawbacks as most available surface electrodes: they are connected by a long cable to the amplifier making it difficult for the patient to move; and can be easily detached from the scalp for lack of effective support.

  • Benefits

    The benefits from the electrode device in comparison with current ones are: suitable dimensions and shape that adapts to the cephalic surface of children, better adhesion, safe replacement of the electroconductive gel and easy handling of the child.

  • Applications

    A specific electrode has been designed for the recording of aEEG in the neonatal and pediatric ICU’s. The new electrode solves the problems of conventional commercial electrodes.

  • Keywords

    Magnetic and superconductory materials/devices; Medical Health related; Medical equipment; Electromedical and medical equipment; Medical instruments; Diagnostic equipment; Healthcare