Method and apparatus for inducing and localizing epileptiform activity
US5743854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1994 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Mar 29, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/4094
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for evoking epileptiform activity in patients with drug resistant epilepsy, as part of a presurgical evaluation procedure are disclosed. The apparatus includes a cranial helmet, for generating a DC magnetic field of a sufficient strength to evoke epileptiform activity, and means for localizing the regions of the patient's brain where said epileptiform activity has been evoked. In the preferred embodiment, the magnetic field strength varies between 1 milliTesla and 2 milliTesla, and is generated by two generally similar coils which are coaxially separated, and which are wound on corresponding thermoplastic members to form the helmet. The desired magnetic field strength is produced at about the middle of the distance between the two coils, in general registration with the hippocampus region of the brain. In an exemplary embodiment, the localizing means includes implantable Foramen Ovale electrodes for sensing the evoked and natural epileptic firings. An EEG machine is connected to the Foramen Ovale electrodes, for recording the sensed evoked and natural epileptic firings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.