Regional oximetry sensor

A peel-off resistant regional oximetry sensor comprising:

• a sensor head attachable to a patient skin surface and configured to transmit optical radiation into the skin and receive that optical radiation after attenuation by blood flow within the skin, the sensor head comprising a perimeter defining a footprint of the sensor head when attached to the patient skin surface, the perimeter comprising a first end, a second end opposite the first end, a first side extending between the first and second ends, and a second side opposite the first side and extending between the first and second ends, the sensor head further comprising a plurality of notches positioned along the perimeter and extending inwardly from the perimeter towards an interior of the sensor head, wherein the plurality of notches define narrow linear channels forming a plurality of independently flexible cutouts in the sensor head, the linear channels and cutouts cooperating to allow for movement of the patient skin surface, wherein the plurality of notches comprises a first group of notches positioned along the first side and a second group of notches positioned along the second side, and wherein the first side and the second side are straight;
• and
• a stem extending from the first end of the sensor head and configured to transmit electrical signals between the sensor head and an attached cable;
• wherein the stem is terminated interior to the sensor head and away from an edge of the sensor head so as to define feet along either side of the stem distal the stem termination, the feet configured to counteract a peel away force resulting when the stem is pulled over the sensor head.