A system and method for monitoring the blood pressure of a patient that allows for a device sensor to be recalibrated according to atmospheric pressure without removing the device sensor from inside the patient. This permits quickly monitoring the blood pressure of a patient if a re-zero is needed. The invention has a blood pressure monitor (BPM) that obtains an atmospheric pressure observation. The atmospheric pressure observation is adjusted and stored to memory as a zero value. The zero value is retrieved to recalibrate the system and method if a device sensor has been disconnected from and reconnected to the same or a different BPM, the patient has been moved such that the surroundings have been altered to make it necessary to recalibrate according to atmospheric pressure, and/or the device sensor has been connected to a different patient care monitor.

An implant includes a processor, RF communication circuitry, optical communication circuitry, a power source and a memory, all of which being hermetically sealed within a housing having a transparent window. Sensor readings are transmitted by RF using the RF communication circuitry to a remote reader after receiving interrogation signals from the reader. During calibration of the sensor, corrective coefficients are calculated by comparing actual sensor pressure readings with known pressure readings. The corrective coefficients are transmitted to the memory of the control circuitry using optical communication wherein modulated light is transmitted through the transparent window of the housing to the photo-detector.

An apparatus for estimating bio-information includes a sensor configured to measure a bio-signal from an object, and a processor configured to obtain a feature based on the measured bio-signal, obtain a bio-information variation based on the obtained feature, obtain an adjustment coefficient based on the obtained bio-information variation, and estimate the bio-information by applying the obtained adjustment coefficient to the obtained bio-information variation.

A measurement system includes: a sensor wire comprising an insertable portion configured to be inserted in a blood vessel of a patient's body; a sensor disposed at the insertable portion at a distal end of the sensor wire, wherein the sensor is configured to provide an output indicative of a temperature in the blood vessel of the patient's body, when inserted inside the blood vessel of the patient's body; and a transceiver unit configured to transfer information related to the output of the sensor to an external communication module using a frequency hopping technique. The transceiver unit comprises a housing adapted to be connected to a proximal end of the sensor wire and configured to remain external to the patient's body.

Sensor delivery devices and methods of measuring Fractional Flow Reserve in a patient are disclosed. One sensor delivery device includes a distal sleeve, a proximal portion, and a pressure sensor. The distal sleeve is configured to be advanced through a patient's vasculature over a guidewire. The pressure sensor is located on the distal sleeve or the proximal portion. The pressure sensor is adapted to generate a signal proportional to fluid pressure. The pressure sensor includes a material having a low thermal coefficient of pressure.

The present disclosure provides a method for blood pressure calibration selection. The method may include inputting a sample set including data files of a plurality of subjects, the data file of each subject including a plurality of sample PPG waveforms and corresponding blood pressure; obtaining calibration data of the each subject in the sample set, the calibration data at least including first calibration data and second calibration data in different blood pressure states; selecting at least one feature parameter of the plurality of sample PPG waveforms; obtaining a value distribution of a feature parameter among the at least one feature parameter in the sample set based on values of the feature parameter in the first calibration data and the second calibration data; and determining calibration data corresponding to a PPG waveform to be detected by comparing the feature parameter of the PPG waveform to be detected with the value distribution.

An example system includes two objects each having a known dimension and positioned spaced apart by a known distance, and a fixture having an opening for receiving an imaging device and for holding the two objects in a field of view of the imaging device such that the field of view of the imaging device originates from a point normal to a surface of the base. The fixture holds the imaging device at a fixed distance from an object being imaged and controls an amount of incident light on the imaging device. An example method of determining image scaling includes holding an imaging device at a fixed distance from an object being imaged, and positioning the two objects in the field of view of the imaging device such that the field of view of the imaging device originates from a point normal to a line formed by the known distance.

An implantable medical device is described. In an example, the implantable medical device includes an electromechanical substrate and sensor, such as a pressure sensor, disposed on the substrate. At least a portion of the sensor is packaged via a liquid encapsulation. The packaging includes a shaped flexible outer membrane that surrounds at least the portion of the sensor. The packaging also includes a hydrophobic liquid disposed between at least the portion of the pressure sensor and the flexible outer membrane. The implantable medical device can be a part of a medical system used for monitoring medical conditions or performing medical operations based on the implantable medical device. Additionally, manufacturing methods are described for packaging the sensor in a liquid encapsulation.

The present technology generally relates to hemodynamic monitoring devices, as well as delivery systems adapted for the implantation of implantable pressure sensors or other implantable devices. In some embodiments, for example, the present technology includes a method of implanting a pressure sensing implant in a human patient. The method includes intravascularly advancing a delivery device carrying the pressure sensing implant toward a pulmonary artery of the patient, and sensing pressure in at least one of a right atrium, a right ventricle, and the pulmonary artery of the patient using a pressure sensing device carried by the delivery device. Sensing the pressure occurs before the pressure sensing implant is fully deployed in the pulmonary artery from the delivery device.

The invention provides an intravenous (IV) dressing system that helps secure an IV catheter to a patient while simultaneously using embedded peripheral venous pressure (PVP), impedance, temperature, optical, and motion sensors to characterize properties of the IV system (e.g., infiltration, extravasation, occlusion) and the patient's physiological parameters (e.g., heart rate, SpO2, respiration rate, temperature, and blood pressure). Notably, the system converts PVP waveforms into arterial BP values (e.g., systolic and diastolic blood pressure).