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ref: Thelin-2011.01 tags: histology MEA tether tissue response malmo lund date: 01-24-2013 22:17 gmt revision:5 [4] [3] [2] [1] [0] [head]

PMID-21298109[0] Implant size and fixation mode strongly influence tissue reactions in the CNS.

  • Overview: tethering and size both increase immune response, and causes continued GFAP activity.
    • An untethered 50um electrode exhibited very weak inflammatory response after 12 weeks.
      • Suggesting that a small electrode can move with the brain.
  • Tethering in their context means affixed rigidly to the bone.
    • Small-diameter, untethered implants cause the smallest tissue reactions.
    • Likely that this scales.
  • Stice et al 2007 {1111} -- GFAP expression was significantly smaller for 12 um diameter implants than 25um implants @ 4 weeks.
  • They used 50um and 200um stainless steel implants.
    • implants glued to micromanipulator using gelatine
  • 24 rats.
  • Much more GFAP and ED1 actviity in tethered implants; NEuN neural density about the same.
  • 50um implant had a higher NeuN + count.
  • Regarding implantation: not sure. Have to find a reference for stab wounds (where the inserter is retracted).

____References____

[0] Thelin J, Jörntell H, Psouni E, Garwicz M, Schouenborg J, Danielsen N, Linsmeier CE, Implant size and fixation mode strongly influence tissue reactions in the CNS.PLoS One 6:1, e16267 (2011 Jan 26)

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ref: Biran-2007.07 tags: tresco biocompatibility tether skull electrodes Michigan probe recording Tresco date: 01-24-2013 20:11 gmt revision:6 [5] [4] [3] [2] [1] [0] [head]

PMID-17266019[0] The brain tissue response to implanted silicon microelectrode arrays is increased when the device is tethered to the skull.

  • Good, convincing, figures.

____References____

[0] Biran R, Martin DC, Tresco PA, The brain tissue response to implanted silicon microelectrode arrays is increased when the device is tethered to the skull.J Biomed Mater Res A 82:1, 169-78 (2007 Jul)