9 results about "Functional residual capacity" patented technology

A device for measuring metabolic parameters and functional residual capacity is connected to a ventilator. To measure CO2 and O2 concentrations, the device takes a sample from a patient's breathing circuit and measures the gas flow rate in the circuit in parallel. The respiratory gas flow rate is measured without a time lag. The CO2 and O2 concentration data differ in time by the transport lag in sample delivery from the patient circuit to the CO2 and O2 sensors. The processor measures and compensates for transport lags. Time-synchronized CO2 and O2 concentration data are time-integrated with the flow rate, and the volumetric amounts of CO2, O2 / N2 are calculated. On the basis of these data, metabolic parameters and / or volumetric capnometry function and / or functional residual capacity are calculated.

An innovative imaging-based subject-specific whole-lung deposition model is provided. Computed tomography (CT) lung volumetric images at total lung capacity (TLC) may be used to segment airways and lobes, and registration of CT images at TLC and functional residual capacity (FRC) provided metrics of regional air volume changes. A volume-filling technique may then be used to generate the entire conducting airways and acinar units. In each acinar unit, a respiratory airway model may be generated based on existing morphometric data. The flow distributions in conducting airways and to acinar units may be calculated by a one-dimensional (ID) computational fluid dynamics (CFD) model. With the simulated airflow field, deposition fractions may be calculated using deposition probability formulae adjusted with an enhancement factor to account for the effects of transient secondary flow and realistic airway geometry.

A method for planning and guiding an endoscopic procedure includes obtaining a first scan of a chest cavity at near total lung capacity, obtaining a second scan of the chest cavity at near functional residual capacity, generating a virtual chest cavity based at least in part on the first scan and the second scan, defining one or more regions of interest (ROI) in the virtual chest cavity, determining a route to the one or more ROIs based on the virtual chest cavity, directing endoscope hardware through an airway to the one or more ROIs along the predetermined route, monitoring, by a processor, a real-time position of the endoscope hardware relative to an expected position along the predetermined route, and performing an examination of the one or more ROIs when the real-time position of the endoscope hardware corresponds to an expected ROI location.

This invention relates to the fields of biomedical engineering and animal physiological testing technology, specifically a method and device for detecting functional residual capacity (FRC) in animals. The method includes constructing a measurable airway circuit, which connects the animal's lungs to an airway of known volume in a sealed manner, forming a sealed container with a smaller volume measurement range. By injecting a quantitative amount of gas into this sealed container and measuring the pressure change inside the sealed container, the volume of the sealed container can be directly calculated, thus accurately obtaining the FRC result of the small animal.

A method for planning and guiding an endoscopic procedure is disclosed. The method includes obtaining a first scan of a thoracic cavity near a total lung volume, obtaining a second scan of the thoracic cavity near a functional residual volume, generating a virtual thoracic cavity based at least in part on the first scan and the second scan, defining one or more regions of interest (ROI) in the virtual thoracic cavity, and determining a path to the one or more ROIs based on the virtual thoracic cavity. The method includes directing endoscopic hardware through an airway to the one or more ROIs along the predetermined path, monitoring, by a processor, a real-time position of the endoscopic hardware relative to an expected position on the predetermined path, and when the real-time position of the endoscopic hardware corresponds to an expected ROI position, transmitting the one or more ROIs to the one or more ROIs. And checking the one or more ROIs (Region Of Interest).

A method for planning and guiding an endoscopic procedure is disclosed. The method includes obtaining a first scan of a chest cavity at near total lung capacity, obtaining a second scan of the chest cavity at near functional residual capacity, generating a virtual chest cavity based at least in part on the first scan and the second scan, defining one or more regions of interest (ROI) in the virtual chest cavity, and determining a route to the one or more ROIs based on the virtual chest cavity. The method includes directing endoscope hardware through an airway to the one or more ROIs along the predetermined route, monitoring, by a processor, a real-time position of the endoscope hardware relative to an expected position along the predetermined route, and performing an examination of the one or more ROIs when the real-time position of the endoscope hardware corresponds to an expected ROI location.

The present application relates to the field of biomedical engineering and animal physiological detection technology, and particularly relates to a method and device for detecting functional residual capacity of animals, which comprises constructing a measurable airway circuit, connecting the lungs of the animals with an airway with a known volume in a sealed manner, forming a sealed container with a smaller volume measurement interval as a whole, measuring the pressure change in the sealed container by injecting a quantitative gas into the sealed container, directly calculating the volume of the sealed container, and accurately obtaining the functional residual capacity of small animals.

A method for imaging a lung of a patient is provided. The method includes acquiring a full inspiration computed tomography (CT) scan of the lung to provide a total lung capacity (TLC) image and acquiring a functional residual capacity contrast enhanced multi-energy CT scan of the lung. The method further includes processing the functional residual capacity contrast enhanced multi-energy CT scan of the lung to generate a perfused blood volume (PBV) image and a virtual non-contrast (VNC) image. The method further includes registering the TLC image to at least one of the PBV and VNC images so as to provide a map of regional ventilation and to co-register local ventilation with blood perfusion, generating a lung performance metric using the co-registered images, and outputting the lung performance metric at a user interface of a computing device.

The invention relates to a method and a device for measuring metabolic parameters and functional residual capacity 14, which is connected to a ventilator 15. To measure the CO2 and O2 concentration, the device takes a sample from the patient's breathing circuit and, in parallel, measures the gas flow rate in the patient's circuit. The respiratory gas flow rate is measured without delay. The oxygen and carbon dioxide concentration data differ in time by the transport delay of the sample supply from the patient circuit to the CO2 and O2 sensors. The processor measures the transport delays T1 and T2 at characteristic points and compensates for them. Time-synchronized CO2 and O2 concentration data are integrated with the flow rate, and the volumetric amounts of CO2, O2, and N2 are calculated.Based on this data, metabolic parameters (REE, RQ), volumetric capnometric function, and / or functional residual capacity (FRC) are calculated using the nitrogen leaching method. The CO2 data are also used to detect artifacts and exclude measurement errors, as well as to exclude the CO2 volume from the leached nitrogen.