Method for determining pulse wave velocity in an artery

    公开(公告)号:US10959622B2

    公开(公告)日:2021-03-30

    申请号:US14625110

    申请日:2015-02-18

    Abstract: Methods, devices, and systems for determining an estimated pulse wave velocity of an artery of a subject. Embodiment methods may include applying a series of counter pressures, measuring a first parameter related to pulse wave velocity, estimating a second parameter in a model, and determining the estimated pulse wave velocity. The counter pressures may be applied at a set location on the subject over the artery with a pressure device. Each of the counter pressures may be different from one another, applied at the set location, and between zero and a diastolic pressure of the subject. The first parameter may be measured when each of the series of counter pressures is applied. The model may establish a relationship of the first parameter measured to each of the series of counter pressures. The estimated pulse wave velocity may be determined based on the second parameter estimated in the model.

    Link status-aware medical devices and gateways

    公开(公告)号:US10939286B2

    公开(公告)日:2021-03-02

    申请号:US16532429

    申请日:2019-08-05

    Abstract: Aspects of the subject matter described in this disclosure can be implemented in electronic medical devices, wireless gateway devices, and remote database systems in a network environment where wireless connections are made between at least an electronic device and a wireless gateway device, and between the wireless gateway device or an access point and a remote database system. The electronic medical device, the wireless gateway device, or the remote database system may be configured to identify a data communication loss based on at least a mismatch of a confirmation acknowledgement attribute between two or more nodes in the network environment. Upon identifying the data communication loss, a notification can be provided to an entity such as a user so that data communication can be restored.

    Inhaler with orientation sensor
    4.
    发明授权

    公开(公告)号:US11033694B2

    公开(公告)日:2021-06-15

    申请号:US14798560

    申请日:2015-07-14

    Abstract: Various embodiments include an inhaler for oral delivery of medication that includes an actuation detector configured to provide an actuation signal in response to release of the medication from the inhaler, and an accelerometer configured to measure an orientation of the inhaler. The inhaler may include a processor, coupled to the actuation detector and the accelerometer, configured with processor-executable instructions to perform operations to determine a quality of use of the inhaler based on the actuation signal provided by the actuation detector and the orientation of the inhaler measured by the accelerometer.

    Methods and devices for recovering data from an amplitude-modulated signal

    公开(公告)号:US11471109B2

    公开(公告)日:2022-10-18

    申请号:US14795703

    申请日:2015-07-09

    Abstract: A device may be configured for performing signal processing in impedance sensing applications, and more specifically, for recovering data from an amplitude-modulated signal. In one aspect, a device includes a sensing circuit operable to sense an amplitude-modulated signal having a carrier frequency. The device also includes a mixer operable to mix the amplitude-modulated signal with a mixing signal having a mixing frequency to provide a frequency-downshifted signal having an intermediate frequency less than the carrier frequency. The device also includes a filter operable to filter the frequency-downshifted signal to provide a filtered signal. The device further includes a sampler operable to undersample the filtered signal at an undersampling frequency to provide a digital signal, the digital signal being representative of a modulating signal.

    Bioimpedance measurement system calibration

    公开(公告)号:US10912481B2

    公开(公告)日:2021-02-09

    申请号:US15233819

    申请日:2016-08-10

    Abstract: Techniques are disclosed for measuring bioimpedance of a biological object with an alternating current (AC) source, a pair of electrodes, a reference load, a switching arrangement switchable between a first switch condition and a second switch condition, and measuring electronics. When the switching arrangement is in the first switch condition, the AC source is applied across the reference load and a group delay of the measuring electronics is determined. When the switching arrangement is in the second switch condition, and the pair of electrodes is in contact with the biological object, a voltage waveform based on the AC source being applied across the pair of electrodes is measured and a calibrated voltage waveform is determined, the calibrated voltage waveform being corrected for the group delay. The bioimpedance value of the biological object is determined based on the calibrated voltage waveform.

    Dynamic calibration of a blood pressure measurement device

    公开(公告)号:US11337657B2

    公开(公告)日:2022-05-24

    申请号:US15191817

    申请日:2016-06-24

    Abstract: Various embodiments enable calibrating a non-invasive blood pressure measurement device by determining multiple parameters defining a stress-strain relationship of an artery of a patient. The device may obtain output signals from a blood pressure sensor at two or more measurement elevations. The obtained measurement signals may be filtered into AC and quasi-DC components, and results fit to exponential functions to calculate an arterial time constant and a veinous time constant related to vein draining/filling rates. The arterial and veinous time constants may be used to calculate an infinity ratio. The infinity ratio and the obtained sensor output may be used to calculate values for multiple parameters defining a stress-strain relationship of a measured artery. Once defined, this stress-strain relationship may be stored and applied to future sensor output signals (e.g., blood pressure measuring sessions) to infer patient blood pressure.

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