The electrical rotary joint with the through hole is optogenetics-ready if its through hole diameter is larger than the diameter of fiber-optic connector on either end of the patch cord that connects fiber-optic rotary joint and fiber-optic cannula implant. If this is the case, the electrical and fiber-optic rotary joints can be used in tandem. With this in mind, we have developed passive electrical rotary joint with low torque of 0.9 mNm and 1.8 mNm for 6 and 12 electrical contacts respectively that can be used either purely for electrophysiology, or, when combined with fiber-optic rotary joints, for electrophysiological recordings of optogenetically induced events.

The joints have 7.5 mm through hole that is sufficiently large to allow passing of M3 connector or ferrule/sleeve type connectors across. The joint also comes equipped with accessories for attaching our standard 1x1 or 1x2 fiber-optic rotary joints. Notes: -The fiber patch cord must have at least one end with connectors or ferrules that are less than through hole diameter. -The number of electrical contacts does not necessarily equals the number of recording channels as some of them might be used by electronics on a head stage.

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