Systems and methods for non-invasive blood pressure measurement are disclosed. In some embodiments, a system comprises a wearable member configured to generate first and second signals, and a blood pressure calculation system. The blood pressure calculation system a pre-processing module configured to filter noise from the signals, and a wave selection module configured to identify subsets of waves of the signals, a feature extraction module configured to generate sets of feature vectors form the subsets of waves, and a blood pressure processing module configured to calculate an arterial blood pressure value based on the sets of feature vectors and an empirical blood pressure calculation model, the empirical blood pressure calculation model configured to receive the sets of feature vectors as input values. The blood pressure calculation system further includes a communication module configured to provide a message including or being based on the arterial blood pressure value.

Systems and methods for determining if a wearable photoplethysmography device is correctly positioned in operating to medical signs of a user by using a classifier to determine if a signal is valid or invalid. In some embodiments, in using the classifier to determine in a signal is valid or invalid, a lean method of linear computational complexity and minimal memory complexity is provided for determining at the wearable photoplethysmography device if it is correctly positioned. In some embodiments, in using the classifier minimal computational complexity is used in determining at the wearable photoplethysmography device if it is correctly positioned.

Physiological cues, such as elevated heart or respiratory rates can be masked from video of a person before the video is sent to another party. The masking of human-perceptible and non-human-perceptible physiological cues removes information from the video that another party could use to determine the person's emotional state. For example, variations in a person's skin color that are typically imperceptible to the human eye and from which a person's heart rate can be detected, can be removed or altered so that another party viewing the video cannot determine the person's actual heart rate in an attempt to determine the person's emotional state, even if they are performing computer analysis on the video. The presence of some physiological cues can be determined by detecting that a physiological measure is above a specified physiological measure threshold. Modified video can have the characteristic that physiological cues are substantially absent in the modified video or that physiological measures extracted from the modified video have a value below an associated physiological measure threshold.

A belt connector is provided. The belt connector is configured to electrically connect a conductor of an electrode belt to a male portion of a snap connector electrode connected to a biometric device. The belt connector includes a frame, a fastener, and an engaging member. The frame includes a receiving hole having radial flexibility. The receiving hole is configured to receive and fasten the frame to a protrusion of the male portion of the snap connector electrode. The fastener is configured to fasten the frame to a first end of the electrode belt. The engaging member is adjacent to the receiving hole and engages the conductor of the electrode belt by the conductor passing through the receiving hole. When the male portion of the snap connector electrode penetrates the receiving hole, the conductor is forced into contact with a lateral surface of the male portion of the snap connector electrode.

The present invention provides, among other things, apparatus and methods of use for treating a subject in need of assistance with breathing. In some embodiments the subject suffers from airflow obstruction. In some embodiments, the subject suffers from chronic obstructive pulmonary disease.

A method and corresponding apparatus for monitoring breathing computes a calibration signal from a first sequence of images of a user's chest to produce a calibration model.. The calibration signal is representative of movement of the user's chest during a first time period during which the user is using an incentive spirometer a commercially-available (IS). The first sequence of images corresponds to the first time period. A method and corresponding apparatus employ the calibration model to produce a breathing information estimate about the user's breathing from a second sequence of images of the user's chest corresponding to a second time period during which the user is not using the a commercially-available IS. Example applications for the method and corresponding apparatus include vital sign applications for personalized healthcare through use of a smartphone.

A pneumocardial function monitor includes a carrier configured to be mounted about at least a part of a trunk of a body of a subject. A sensing arrangement is mounted on the carrier, the sensing arrangement including at least one element for monitoring changes in volume of the part of the subject's body. A signal processing module is in communication with the sensing arrangement for processing signals output from the sensing arrangement, the signal processing module having at least one output for outputting a signal related to respiratory function and/or cardiac function.

A belt connector is provided. The belt connector is configured to electrically connect a conductor of an electrode belt to a male portion of a snap connector electrode connected to a biometric device. The belt connector includes a frame, a fastener, and an engaging member. The frame includes a receiving hole having radial flexibility. The receiving hole is configured to receive and fasten the frame to a protrusion of the male portion of the snap connector electrode. The fastener is configured to fasten the frame to a first end of the electrode belt. The engaging member is adjacent to the receiving hole and engages the conductor of the electrode belt by the conductor passing through the receiving hole. When the male portion of the snap connector electrode penetrates the receiving hole, the conductor is forced into contact with a lateral surface of the male portion of the snap connector electrode.

The present invention provides, among other things, apparatus and methods of use for treating a subject in need of assistance with breathing. In some embodiments the subject suffers from airflow obstruction. In some embodiments, the subject suffers from chronic obstructive pulmonary disease.

A system for generating an indicator at least in part relating to fluid levels in a biological subject, the system including one or more processing devices that, in response to at least one impedance measurement performed on the subject determine a parameter value at least in part using results of the at least one impedance measurement, perform an assessment to determine if the parameter value is indicative of a meaningful change in a subject normal, the subject normal being based on results of a plurality of previous impedance measurements and use results of the assessment to generate an indicator indicative of fluid levels or selectively update the subject normal.