Resposable pulse oximetry sensor

A method of determining a duration of use and a type of pulse oximetry sensor, the method comprising:

• combining components including a reusable emitter, a reusable detector, a breakable conductor including a purposefully weakened portion, an information element, and a securing mechanism, to form a pulse oximetry sensor, wherein two or more of the components form an electrical circuit;
• and
• determining from characteristics of the electrical circuit a type of one or more of the components and whether at least one of the components has been overused.

A pulse oximetry sensor comprising;

• reusable means for determining a characteristic of a measurement site, including a means for emitting light through tissue of the measurement site, means for receiving the light from the tissue, and means for completing an electrical circuit;
• and
• disposable means for substantially securing the reusable means to the measurement site, including means for determining overuse of the disposable means and means for determining a type of the pulse oximetry sensor, wherein the means for determining overuse and the means for determining the type are in electrical communication with the means for completing the electrical circuit.