When shopping for this grooming tool, you will find several options. The standard model does a great job and is the most cost effective option. If you ever find that the product is not working as well as it used to, you can purchase FURminator replacement blades to make it as good as new. You can also purchase a FURminator deshedding tool with furejector. The furejector is a simple attachment that captures the loose hairs from the brush. You can also opt to buy the FURminator vacuum attachment. Similar in design to the original, this option can be attached to a vacuum cleaner, which can suck up the hair as it is removed. You’ll want to test your dog’s tolerance for this before purchasing as some canines may be scared of the loud noises from the vacuum cleaner.
As part of an evaluation for epilepsy surgery, it may be necessary to insert electrodes near the surface of the brain, under the surface of the dura mater . This is accomplished via burr hole or craniotomy . This is referred to variously as "electrocorticography (ECoG)" , "intracranial EEG (I-EEG)" or "subdural EEG (SD-EEG)". Depth electrodes may also be placed into brain structures, such as the amygdala or hippocampus , structures, which are common epileptic foci and may not be "seen" clearly by scalp EEG. The electrocorticographic signal is processed in the same manner as digital scalp EEG (above), with a couple of caveats. ECoG is typically recorded at higher sampling rates than scalp EEG because of the requirements of Nyquist theorem —the subdural signal is composed of a higher predominance of higher frequency components. Also, many of the artifacts that affect scalp EEG do not impact ECoG, and therefore display filtering is often not needed.