A system and method for measuring vital signs and motion from a patient. The system features: (i) first and second sensors configured to independently generate time-dependent waveforms indicative of one or more contractile properties of the patient's heart; and (ii) at least three motion-detecting sensors positioned on the forearm, upper arm, and another different body location of the patient. Each motion-detecting sensor generates at least one time-dependent motion waveform indicative of motion of the location on the patient's body to which it is affixed. A processing component, worn on the patient's body and featuring a microprocessor, receives the waveforms generated by the different sensors and processes them to determine: (i) a pulse transit time calculated using a time difference between features in two separate time-dependent waveforms, (ii) a blood pressure value calculated from the time difference, and (iii) a motion parameter calculated from at least one motion waveform.

An insole system includes a cushion layer configured to contact a human foot within an article of footwear and a sensing layer coupled to the cushion layer. The sensing layer may include a first sensing element and a second sensing element. The first sensing element and the second sensing element are one of: a force sensing element, a strain sensing element, or an environmental sensing element, wherein the first sensing element and the second sensing element are of a different type of sensing element. The insole system may also include a communications interface configured to couple the sensing layer with a host controller.

The invention provides a system and method for measuring vital signs and motion from a patient. The system features: (i) first and second sensors configured to independently generate time-dependent waveforms indicative of one or more contractile properties of the patient's heart; and (ii) at least three motion-detecting sensors positioned on the forearm, upper arm, and a body location other than the forearm or upper arm of the patient. Each motion-detecting sensor generates at least one time-dependent motion waveform indicative of motion of the location on the patient's body to which it is affixed. A processing component, typically worn on the patient's body and featuring a microprocessor, receives the time-dependent waveforms generated by the different sensors and processes them to determine: (i) a pulse transit time calculated using a time difference between features in two separate time-dependent waveforms, (ii) a blood pressure value calculated from the time difference, and (iii) a motion parameter calculated from at least one motion waveform.

A wearable device and the accompanying method for the determination of continuous pulsatile BP are described. The absolute values can be obtained in the initial phase and how a transfer function can transform the BP-signal obtain at the finger or wrist to correct BP-values corresponding to the brachial artery and at heart level. The wearable device contains an orthostatic level-correcting element, which can measure the vertical distance between heart level and finger/wrist level, where the actual measurement takes places. The wearable device may be in the form of a ring, a watch, or a bracelet. Further, the wearable device has elements for wirelessly transmitting signals to host devices such as a smart phone, tablet or other computers.

Disclosed is an apparatus, system, and method for compensating for hydrostatic pressure offset in transducer-based pressure measurements. The system may comprise: a measurement pressure transducer to measure an apparent fluid pressure at a measurement site, a reference pressure transducer to measure a hydrostatic pressure caused by a level difference between the measurement pressure transducer and the measurement site, and a controller to generate a corrected fluid pressure measurement based on the apparent fluid pressure and the hydrostatic pressure, wherein the measurement pressure transducer and the reference pressure transducer are placed at a same first level, and the measurement site and an end of a fluid-filled tube connected to the reference pressure transducer are at a same second level.

Method, apparatus and system for estimating heart rate with a wearable device. The method includes receiving movement data and heart rate data, the movement data indicative of physical exertion of an individual associated with the wearable device, and the heart rate data measured for the individual during the same period; determining an estimated human power output based on the movement data indicative of physical exertion of the individual; determining a heart rate demand value for improving a heart rate estimate based on the estimated human power output and at least one adaptive parameter, wherein the heart rate estimate corresponds to the heart rate data, and the at least one adaptive parameter is adjustable based on the heart rate demand value and the heart rate estimate; and determining an improved heart rate estimate for the individual based on the heart rate demand value and the heart rate estimate.

According to an aspect, there is provided a method for measuring the intracranial pressure, ICP, in a subject, the method comprising detecting whether spontaneous retinal venous pulsations, SRVPs, are occurring in an eye of the subject as the orientation of the head of the subject changes; identifying the orientation of the head of the subject at which SRVPs start to occur or stop occurring; and using the identified orientation of the head of the subject at which SRVPs start to occur or stop occurring to determine the ICP in the subject.

Representative methods, apparatus and systems are disclosed for determining one or more physiological parameters, such as for ambulatory blood pressure and other vital sign monitoring. A representative system comprises first and second wearable apparatuses to be worn on the user's left and right sides, and any of several types of central vital signs monitors. Another representative system is a handheld, singular apparatus to be held in both hands by the user. Another representative system comprises first and second wearable apparatuses without any additional central vital signs monitor. The various embodiments measure a differential pulse arrival time of left and right arterial pressure waves using corresponding determined features, such as a foot or systolic peak, and using the measured differential pulse arrival time and calibration data, determine at least one physiological parameter such as blood pressure, heart rate, stroke rate, and cardiac output.

A CPU of a blood pressure measurement apparatus configured to be used while attached to a wrist of a measurement subject calculates an inclination angle formed by a forearm of the measurement subject with respect to a reference plane, and a rotation angle about an axis, where the forearm is used as the axis, of the blood pressure measurement device, based on information detected by an acceleration sensor, and uses the distance d between the radial artery and the ulnar artery that pass through the wrist, the inclination angle, and the rotation angle to determine the relative positional relationship between the radial artery and the ulnar artery. In accordance with the relative positional relationship, the CPU guides the measurement orientation of the measurement subject.

A wearable device includes: a biological information detection unit which detects biological information of a user; a body motion detection unit which detects a body motion signal related to a movement of the user; a processing unit which generates notification information based on at least one type of information, of the biological information and the body motion signal; and a notification unit (display unit) which notifies the user of the notification information. The processing unit detects a movement state based on the body motion signal of the user. The processing unit performs processing (control) in which the notification unit is made to notify the user of the notification information if a first movement state included in the movement state is detected. The processing unit performs processing (control) in which the notification of the notification information by the notification unit is stopped if a second movement state is detected.