An airbag (10), a blood pressure measurement apparatus, and a blood pressure measurement method are provided. The blood pressure measurement apparatus includes a cavity (20), a pressing part (30), an air pump (40), a barometric pressure sensor (50), and an airbag (10). The airbag (10) is long-strip-shaped, the airbag (10) has a fixed end (113) and a free end (115), the fixed end (113) is fixed in the cavity (20), a plurality of grooves (101) are distributed on a surface of the airbag (10) along a length extension direction, and the grooves (101) extend along a width direction of the airbag (10). Each groove (101) can divide the airbag (10) into a pressurized area (110) and a non-pressurized area (115) along the length direction when the pressing part (30) movably disposed in the cavity (20) is pressed against the groove (101). The pressurized area (110) and the non-pressurized area (115) isolate air flow from each other, air holes (102) connecting the inside and the outside of the airbag (10) are distributed between every two adjacent grooves (101), and the cavity (20) is configured to accommodate the non-pressurized area (115) of the airbag (10), and when the airbag (10) does not work, accommodate the entire airbag (10). The blood pressure measurement apparatus in this application can adjust ratios of the pressurized area to wrist circumferences of different people. This improves blood pressure signal collection stability and blood pressure measurement accuracy.

A state of a cognitive function can be determined by using biological information measured as part of daily healthcare management. A biological information acquisition device includes a cognitive function test unit for testing a cognitive function, a biological information acquisition unit for performing biological information acquisition processing for acquiring biological information of a user, and a cognitive function determination unit for determining a state of the cognitive function, wherein the cognitive function determination unit determines the state of the cognitive function based on a result of the cognitive function test and the biological information acquired from the user.

A fluid circuit of a blood pressure measurement device includes a first cuff connected to a secondary side of a pump that supplies a fluid to a secondary side, a second cuff connected to a secondary side of the first cuff, a first valve provided between the first cuff and the second cuff, the first valve that closes when a differential pressure between the first cuff and the second cuff reaches a predetermined differential pressure, and a fluid resistor provided between the first valve and the second cuff.

A method for monitoring a health parameter in a person is disclosed. The method involves transmitting radio waves below the skin surface of a person and across a range of stepped frequencies, receiving radio waves on a two-dimensional array of receive antennas, the received radio waves including a reflected portion of the transmitted radio waves across the range of stepped frequencies, generating data that corresponds to the received radio waves, wherein the data includes amplitude and phase data, deriving data from at least one of the amplitude and phase data, and determining a value that is indicative of a health parameter in the person in response to the derived data.

A method for monitoring a health parameter in a person is disclosed. The method involves transmitting radio waves below the skin surface of a person and across a range of stepped frequencies, receiving radio waves on a two-dimensional array of receive antennas, the received radio waves including a reflected portion of the transmitted radio waves across the range of stepped frequencies, generating data that corresponds to the received radio waves, wherein the data includes amplitude and phase data, deriving data from at least one of the amplitude and phase data, and determining a value that is indicative of a health parameter in the person in response to the derived data.

A method for estimating blood pressure using a blood flow occlusion system applied to an artery includes receiving from a first sensor a sensed signal; processing at a processor the sensed signal to detect beats in a pulsatile signal; determining validity of the detected beats; storing the detected beats and data associated with the detected beats in the sensed signal as the pressure applied to the artery by the blood flow occlusion system deflates towards a level below a nominal level; determining baseline beat characteristics; evaluating the stored beats and associated data to detect change in beat characteristics as compared to the baseline beat characteristics; selecting a beat before the detected change in the beat characteristic as the last beat indicating the onset of the diastolic blood pressure for the artery; determining a value of the applied pressure at the last beat as the diastolic blood pressure for the artery.

A tourniquet includes a surrounding device, a measuring portion, and an elastic band portion connected in series, wherein the measuring portion defines an accomodating space for placing an air bag device with an elastic air bag. A radial resonant ring formed by connecting the measuring portion and the elastic band portion in series can reduce the influence of non-radial vibration, so as to improve the sensitivity and accuracy of the radial resonance of the tourniquet of the present disclosure.

Systems and methods for optimizing sensor pressure in blood pressure (BP) measurements using a wearable device are provided. An example method includes recording substantially synchronously photoplethysmogram (PPG) data using a PPG sensor and pressure data using at least one pressure sensor on a wearable device, the wearable device having the PPG sensor, and wherein the at least one pressure sensor is substantially located over a user wrist radial artery while an external force gradually applies and releases pressure a plurality of times to the wearable device, wherein the external force is applied to the radial artery. The PPG data and the pressure data is monitored as the PPG data changes in response to the external force being applied and released multiple times during a period. From the recorded PPG and pressure data, a set data us formed of PPG peak values and pressure values. A curve is fitted through the data set. From the curves apex value a MAP value is determined.

Systems and methods for optimizing sensor pressure in blood pressure (BP) measurements using a wearable device are provided. An example method includes recording substantially synchronously photoplethysmogram (PPG) data using a PPG sensor and pressure data using at least one pressure sensor on a wearable device, the wearable device having the PPG sensor, and wherein the at least one pressure sensor is substantially located over a user wrist radial artery while an external force gradually applies and releases pressure a plurality of times to the wearable device, wherein the external force is applied to the radial artery. The PPG data and the pressure data is monitored as the PPG data changes in response to the external force being applied and released multiple times during a period. From the recorded PPG and pressure data, a set data us formed of PPG peak values and pressure values. A curve is fitted through the data set. From the curves apex value a MAP value is determined.

A pulse wave detecting device includes: a pressure pulse wave detector which is configured to press a pressing surface in which a pressure detecting element is formed, against a radial artery under a skin of a wrist of a subject, and which is configured to detect a pressure pulse wave from the radial artery; and a housing which accommodates the pressure pulse wave detector in a state where the pressing surface is exposed toward the wrist. The housing is configured so that a compression pressure which is exerted by the housing in an attachment state where the housing is attached to the wrist, and which is applied onto the radial artery is smaller than a compression pressure which is exerted by the pressing surface in the attachment state, and which is applied onto the radial artery.