The invention proposes a system for measuring a resonance frequency of a tube. The system comprises: an oscillating unit (21) for oscillating the tube at a plurality of oscillation frequencies, respectively; a detecting unit (22) for detecting a time delay of transmitting a pressure pulse from a first position to a second position in the tube when the tube is oscillated at each oscillation frequency, wherein, when the tube is oscillated at each oscillation frequency in a specific oscillation frequency range of the plurality of oscillation frequencies, the detecting unit (22) detects a variation of the time delaya determining unit (23) for determining a maximal variation of the time delay when the tube is oscillated at the oscillation frequencies in the specific oscillation frequency range; andan indicating unit (24) for indicating an oscillation frequency corresponding to the maximal variation of the time delay, being a resonance frequency of the tube.

A blood pressure detection method is used for the sphygmomanometer including an envelope, an air pressure control mechanism, an ultrasonic wave transmission mechanism and an ultrasonic wave reception mechanism. The blood pressure detection method includes: applying a control signal to the air pressure control mechanism and the ultrasonic wave transmission mechanism, to inflate and deflate the envelope, and enable the ultrasonic wave transmission mechanism to transmit an ultrasonic detection signal toward the to-be-detected body part at a predetermined interval; monitoring an ultrasonic reflection signal received by the ultrasonic wave reception mechanism; determining a detection time point for the blood pressure detection in accordance with a frequency of the ultrasonic reflection signal during the deflation of the envelope; and determining a blood pressure value for the blood pressure detection in accordance with a pressure value of air within the envelope at the detection time point.

A system and method are presented for use in monitoring one or more conditions of a subject's body. The system includes a control unit which includes an input port for receiving image data, a memory utility, and a processor utility. The image data is indicative of data measured by a pixel detector array and is in the form of a sequence of speckle patterns generated by a portion of the subject's body in response to illumination thereof by coherent light according to a certain sampling time pattern. The memory utility stores one or more predetermined models, the model comprising data indicative of a relation between one or more measurable parameters and one or more conditions of the subject's body. The processor utility is configured and operable for processing the image data to determine one or more corresponding body conditions; and generating output data indicative of the corresponding body conditions.

Embodiments are directed to a blood pressure measurement device that includes a strap operable to couple the blood pressure measurement device to a user and a pump coupled to the strap. In some embodiments, the blood pressure measurement device includes an inflatable chamber fluidly coupled to the pump and positioned between the pump and the user when the blood pressure measurement device is coupled to the user. The inflatable chamber can be configured to expand towards the user when inflated. The blood pressure measurement device can include a sensing chamber coupled to the inflatable chamber and configured to be placed between the inflatable chamber and the user; a pressure sensor positioned in the sensing chamber and configured to detect a pressure of the liquid; and a vibration sensor positioned in the sensing chamber and configured to detect vibrations due to blood flow of the user.

A touch sensing device may include an air pressure sensor having a hole portion, an interior of the air pressure sensor being in flow communication with an exterior of the air pressure sensor through the hole portion; and a sealing structure being in flow communication with the air pressure sensor. The sealing structure and the air pressure sensor may form a cavity, the cavity being in flow communication with the interior of the air pressure sensor through the hole portion. A part of the cavity enclosed by the sealing structure may deform under user contact, and the deformation may cause a change of an air pressure change at the cavity. The air pressure sensor may receive the change of the air pressure at the cavity through the hole portion and convert the change of the air pressure into an electrical signal.

The present invention provides a technique for continuous measurement of blood pressure based on pulse transit time and which does not require any external calibration. This technique, referred to herein as the Composite Method, is carried out with a body-worn monitor that measures blood pressure and other vital signs, and wirelessly transmits them to a remote monitor. A network of body-worn sensors, typically placed on the patient's right arm and chest, connect to the body-worn monitor and measure time-dependent ECG, PPG, accelerometer, and pressure waveforms. The disposable sensors can include a cuff that features an inflatable bladder coupled to a pressure sensor, three or more electrical sensors (e.g. electrodes), three or more accelerometers, a temperature sensor, and an optical sensor (e.g., a light source and photodiode) attached to the patient's thumb.

A portable wearable computing device configured to continuously obtain data indicative of a patient's vital signs is disclosed. The portable wearable computing device includes a temperature sensor configured to obtain data indicative of body temperature of the patient. The portable wearable computing device further includes a blood oxygen saturation sensor configured to obtain data indicative of amount of oxygen present in the patient's body. The portable wearable computing device further includes an arterial waveform sensor configured to obtain data indicative of an arterial waveform produced by the patient's artery. The portable wearable computing device further includes a processor coupled to the temperature sensor, the blood oxygen sensor, and the blood pressure sensor, and configured to receive the obtained data indicative of the patient's vital signs.

A system and method prevents and diagnoses deep vein thrombosis in a body limb by providing a pressure sleeve having a plurality of individually fillable cells, the pressure sleeve being configurable to be placed around a body limb. A source fills each fillable cell individually, and a pressure sensor measures a pressure in a fillable cell. A controller establishes a fill sequence of each individually fillable cell and a fill time for each individually fillable cell. The controller causes a first individually fillable cell of the pressure sleeve to be filled to a predetermined pressure and causes the pressure of first individually fillable cell of the pressure sleeve to be measured while a second individually fillable cell of the pressure sleeve is filled. The controller determines a presence of deep vein thrombosis in a body limb having the pressure sleeve therearound based upon a measured pressure change in the first individually fillable cell of the pressure sleeve. The monitored pressure changes reflects the effect of venous obstruction on naturally occurred venous flow fluctuations like those caused by the respiratory cycle, and/or artificially created fluctuations like those caused by inflation of a second pressure cell. Relevant data can be collected during routine system application for deep vein thrombosis prevention on a 24/7 basis. In the case deep vein thrombosis is suspected, a controlled and more sophisticated study can be triggered using the same system.

A sensor for blood-based measurement parameters that can be integrated on any flat surface to allow for ubiquitous monitoring of hemodynamics is disclosed. Such a sensor can measure heart rate, heart rate variability, blood pressure, etc. The sensor is adapted to be placed in direct contact with blood vessels. This can be done with an accelerometer or another type of vibrational or acoustic sensor in order to measure arterial vibrations.

Provided here are methods of detecting compromised cerebrovascular reactivity in a subject and treating such subject. The method includes acquiring transcranial Doppler signals and cardiac measurements from the subject following a breath-hold maneuver and recording a test set of CBFV measurements. A breath-hold acceleration index is calculated based on a linear regression correlation of temporal variations of the mean velocity across all cardiac cycles during the breath-hold maneuver. The presence of compromised cerebrovascular reactivity in the subject is detected in response to variations in the breath-hold acceleration index of the subject as compared to a healthy individual performing breath-hold maneuver under similar conditions. If the subject has compromised cerebrovascular reactivity, a therapeutically effective compound is administered to the subject along with provision of behavioral modification regimen.