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Flex Array v3 FAQ
Why is the cannula needed for insertion?
A glass guide cannula is necessary for insertion of the probe. It helps to create a pathway for the array to reach the target depth. The fibers themselves will extend beyond the end of the cannula and will record at the tips of the fibers beyond the damage caused by the cannula.
What is the cost per device?
Per the MINT Grant, these arrays are being distributed at no cost to you. However, typically each array is valued at approximately $100.
What depths can be reached/what are the lengths of the shanks?
The Flex Array v3 is able to reach up to 7mm using the glass guide cannula. The shank itself is 10mm, so a minimum of 2-3mm is needed to cement the glass cannula in place. The fibers typically extend beyond the edge of the board by 500μm with some users requesting shorter lengths of 400μm & 300μm.
What is the difference in the tip treatments?
Laser Cut w/ PEDOT:pTS – Parylene-c coated carbon fibers have their tips re-exposed using a laser. Then PEODT:pTD is electroplated to reduce the size impedance. This treatment is ideal for electrophysiological recordings.
Laser Ablation w/ Plasma Ashing – 50-100μm of the parylene-c coating is removed from the tip of the carbon fibers via laser ablation. The tips are then subjected to a plasma ashing step to remove any residual polymer. This treatment allows for optimal dopaminergic recordings with the potential to do electrophysiological recordings, though the impedance values are not as low as those found with PEDOT:pTS coated fibers
What are the ground and reference wires?
The wires are 50mm long Teflon coated silver wire (AWG 36) with 20mm exposed at the end.
Can these be re-used?
These probes were designed for chronic implantation and re-use/re-insertion has not been studied in depth.
Can these arrays be used for stimulation?
While PEDOT coated electrodes are often used for stimulation, these arrays have not been evaluated for that purpose.
Can these arrays be sterilized?
Yes, these probes can be sterilized using ethylene oxide. If you do choose to sterilize using ethylene oxide, you can keep them in the original box; however, we strongly recommend you remove the piece of foam on the underside of the lid as it can come off during sterilization. We do not recommend using steam sterilization.
High Density Carbon Fiber Array FAQ
When will these be available?
These arrays are currently being developed and not available for distribution at this time. Please register as a user to receive updates on these devices.