Abstract: This document describes systems, methods, and devices for sensing electrical activity in a brain of a mammal. Some aspects include a cortical electrode assembly configured, in use, to sense electrical activity at a surface of a brain, the assembly comprising: a ring-shaped substrate; and a plurality of electrical sensors affixed to the ring-shaped substrate, wherein the plurality of electrical sensors are spaced along the ring-shaped substrate so as to form a ring of electrical sensors that substantially encircle an aperture formed by the ring-shaped substrate.

Abstract: This document describes systems, methods, and devices for sensing electrical activity in a brain of a mammal Some aspects include a cortical electrode assembly configured, in use, to sense electrical activity at a surface of a brain, the assembly comprising: a ring-shaped substrate; and a plurality of electrical sensors affixed to the ring-shaped substrate, wherein the plurality of electrical sensors are spaced along the ring-shaped substrate so as to form a ring of electrical sensors that substantially encircle an aperture formed by the ring-shaped substrate.

Abstract: An intracranial apparatus that may be used for electrophysiological monitoring and stimulation of brain tissue of a patient. Embodiments comprise a stylet including a body section and a tip configured to separate brain tissue, a sheath including a body section having an outer surface defining a central opening configured to receive the stylet such that the tip of the stylet extends beyond the body section of the sheath, and a plurality of electrodes disposed at the outer surface of the sheath and configured to be connected to the brain tissue surrounding the sheath for stimulating and/or monitoring.

Abstract: This document describes systems, methods, and devices for sensing electrical activity in a brain of a mammal Some aspects include a cortical electrode assembly configured, in use, to sense electrical activity at a surface of a brain, the assembly comprising: a ring-shaped substrate; and a plurality of electrical sensors affixed to the ring-shaped substrate, wherein the plurality of electrical sensors are spaced along the ring-shaped substrate so as to form a ring of electrical sensors that substantially encircle an aperture formed by the ring-shaped substrate.

Abstract: A safety mechanism for a utility knife, including a razor blade mounted in a blade holder slideably mounted in a blade chamber in the housing. A first blade holder includes an arm extending therefrom with an engaging surface thereon. A second blade holder includes a tab extending therefrom. When either blade holder is deployed from the housing, the tab contacts the engaging surface, thereby preventing deployment of the other blade until the original blade is retracted.