An exemplary sensor includes a sensor pad defining a plurality of openings and a circuit board. The circuit board is at least partially disposed in the sensor pad and has a light source configured to generate near-infrared light and a light detector configured to receive near-infrared light. The light source and the light detector are each aligned with one of the openings of the sensor pad so that near-infrared light generated by the light source can travel through a part of a patients body to the light detector and the near-infrared light received by the light detector indicates oxygen saturation of the part of the patients body through which the light travelled. The circuit board further includes an integrally formed tail at least partially disposed in the sensor pad. Additionally, the sensor pad includes an overlay disposed on the tail.
