The “BR” style microdialysis probe is BASi’s most popular style brain microdialysis probe.  This concentric microdialysis probe is stocked in two different membrane lengths, 2 mm and 4 mm.  The cannula length is optimized to reach anywhere in the rat brain. Custom membrane and cannula lengths are available.  If you are working with mice, see the MBR style microdialysis probes.

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Name BR-2 (2 mm membrane) Brain Microdialysis Probes
BR-4 (4 mm membrane) Brain Microdialysis Probes 
Part Number MD-2200, BR-2, 2mm membrane
MD-2204, BR-4, 4mm membrane 
Cannula Coated fused silica


Probe Volume 2.1 to 2.3 µL (BR-2 or BR-4)


Use Use with optional BR intracerebral guide cannula, or mount directly on skull using acrylic cement.  Commonly used for rats, hamsters, and guinea pigs.  Non-metallic, can be used for NMR imaging.


Membrane PAN. 30KDa MWCO, 320µm OD, 2 or 4 mm lengths in stock. Custom length probes available


Dimensions Membrane


OD 320µm ID 220µm
Probe Cannula Diameter


OD 510µm ID 360µm
Probe Cannula Length


15 MM
Probe Cannula Length
when in BASi guide cannula 
10 mm
Head Diameter


OD 6.4mm
Tubing Inlet/Outlet


OD 635µm ID 254µm

“BR” style BRain Microdialysis Probes