A cranial window imaging method for monitoring vascular growth around chronically implanted micro-ECoG devices.

Abstract:

:Implantable neural micro-electrode arrays have the potential to restore lost sensory or motor function to many different areas of the body. However, the invasiveness of these implants often results in scar tissue formation, which can have detrimental effects on recorded signal quality and longevity. Traditional histological techniques can be employed to study the tissue reaction to implanted micro-electrode arrays, but these techniques require removal of the brain from the skull, often causing damage to the meninges and cortical surface. This is especially unfavorable when studying the tissue response to electrode arrays such as the micro-electrocorticography (micro-ECoG) device, which sits on the surface of the cerebral cortex. In order to better understand the biological changes occurring around these types of devices, a cranial window implantation scheme has been developed, through which the tissue response can be studied in vivo over the entire implantation period. Rats were implanted with epidural micro-ECoG arrays, over which glass coverslips were placed and sealed to the skull, creating cranial windows. Vascular growth around the devices was monitored for one month after implantation. It was found that blood vessels grew through holes in the micro-ECoG substrate, spreading over the top of the device. Micro-hematomas were observed at varying time points after device implantation in every animal, and tissue growth between the micro-ECoG array and the window occurred in several cases. Use of the cranial window imaging technique with these devices enabled the observation of tissue changes that would normally go unnoticed with a standard device implantation scheme.

journal_name

J Neurosci Methods

authors

Schendel AA,Thongpang S,Brodnick SK,Richner TJ,Lindevig BD,Krugner-Higby L,Williams JC

doi

10.1016/j.jneumeth.2013.06.001

subject

Has Abstract

pub_date

2013-08-15 00:00:00

pages

121-30

issue

1

eissn

0165-0270

issn

1872-678X

pii

S0165-0270(13)00218-5

journal_volume

218

pub_type

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