Multi-state clip-on fixation method for pulse oximeter

A device including:

• a light source;
• a light detector spaced from, and in communication with, the light source;
• an electronic processor programmed to compute pulse oximetry data from output of the light detector;
• a clamping member on or in which the light source and the light detector are disposed, the clamping member configured for attachment to a human body part with the body part disposed between the light source and the light detector such that light from the light source passes through the body part to reach the light detector;
• a bi-stable hinge configured to apply a compression force to the clamping member, thereby allowing the clamping member to transition from a first stable state to a second stable state,
• wherein the bi-stable hinge includes a leaf spring configured to apply the compression force to the clamping member, the leaf spring being movable between an unlocked position in which the leaf spring is arced in a first direction and a locked position in which the leaf spring is arced in an opposite second direction,
• wherein the clamping member is configured to attach to the body part by transitioning from the first stable state to the second stable state via the compression force applied to the clamping member.