A micro-electro-mechanical system device includes a substrate, having a first side and second side, the second side has a cavity and a plurality of venting holes in the substrate at the second side with connection to the cavity. In one embodiment, methods and devices are provided for moving an end effector on a distal end of a surgical fastening device. The rotor assembly includes a back iron and an annular magnet mounted to the back iron so as to be disposed in radially spaced relationship about the stator. The onsite analysis comprises determination of gas oil ratio, API gravity and various other parameters which can be estimated by a trained neural network or chemometric equation a flexural mechanical resonator is also provided to measure fluid density and viscosity from which additional parameters can be estimated by a trained neural network or chemometric equation. Finally, in response to the information received, a request to perform posture validation is generated and sent to the access device, wherein the request includes supplicant identifying information, the time value, and instructions that instructs the access device to initiate the posture validation for that supplicant only after the time value has expired. The method may further comprise positioning an implant between the vertebrae in the patient.