Bilateral device, system and method for monitoring vital signs

A method for measuring a blood pressure of a user, the method comprising:

• generating a first optical waveform from a signal from a first optical sensor positioned on a finger of a right-hand of the user;
• generating a second optical waveform from a signal from a second optical sensor, the second optical waveform generated simultaneously with the first optical waveform, the second optical sensor positioned on a finger of a left-hand of the user;
• generating an electrical waveform from a signal from a first electrode positioned in proximity with the first optical sensor and a signal from a second electrode positioned in proximity with the second optical sensor;
• using a microprocessor to determine a first pulse transit time, the first pulse transit time calculated by processing the electrical waveform in and the first optical waveform;
• using the microprocessor to determine a second pulse transit time, the second pulse transit time calculated by processing the electrical waveform and the second optical waveform;
• and
• processing the first pulse transit time and the second pulse transit time to determine a blood pressure value for the user.

A method for measuring a blood pressure of a user, the method comprising:

• generating a first optical waveform in from a signal from a first optical sensor positioned on the user;
• generating a second optical waveform from a signal from a second optical sensor positioned on the user, the second optical waveform generated simultaneously with the first optical waveform, the second optical sensor positioned a distinguishable distance from the first optical sensor on the user;
• generating an electrical waveform from a signal from a first electrode positioned in proximity with the first optical sensor and a signal from a second electrode positioned in proximity with the second optical sensor;
• using a microprocessor to determine a first pulse transit time, the first pulse transit time calculated by processing the electrical waveform and the first optical waveform;
• using the microprocessor to determine a second pulse transit time, the second pulse transit time calculated by processing the electrical waveform and the second optical waveform;
• processing the first pulse transit time and the second pulse transit time to determine a blood pressure value for the user;
• taking a second derivative of at least one of the first optical waveform in and the second optical waveform, and then processing the second derivative to determine a property related to arterial compliance.