27 results about "Blood flow volume" patented technology

Provided is a method and a system for noninvasive measurement of blood viscosity based on oxygen saturation and blood flow rate, which may easily and quickly calculate the blood viscosity by using the method and the system for noninvasive measurement of blood viscosity based on oxygen saturation and blood flow rate, thereby enabling immediate obtaining of the blood viscosity.

This application provides a medical image processing method and system. The method includes: acquiring vascular image volume data from photon-counting computed tomography scans of a target region; based on the vascular image volume data, performing skeletonization processing on the vascular network, extracting multiple skeleton points in the vascular network, and forming a vascular centerline network according to the connection relationships between the skeleton points; identifying endpoints and bifurcation points from the vascular centerline network, thereby dividing the vascular centerline network into several continuous and unbifuzzy vascular segments, and constructing a vascular centerline diagram structure based on each vascular segment; establishing and solving a blood flow analysis model based on the vascular centerline diagram structure to obtain the blood flow analysis results of the vascular network; wherein, the blood flow analysis results include the blood flow rate and / or pressure difference between the two ends of each vascular segment. This application improves the accuracy of the blood flow analysis results.

This invention discloses a real-time visualization monitoring device for microcirculation blood flow, comprising a deep signal acquisition module, a blood flow dynamic acquisition module, an active calibration module, a signal extraction module, and a visualization display module. The deep signal acquisition module acquires mixed light signals from the target tissue region and extracts the signal amplitude. The blood flow dynamic acquisition module acquires a sequence of original light intensity images modulated by ultrasound. The active calibration module obtains the static interference coefficient. The signal extraction module calculates the deep microcirculation blood flow index Q based on a built-in standard reference parameter set. The visualization display module combines a pseudo-color blood flow map with an eschar morphology image to generate a fused image. This invention effectively removes interference from strong scattered light from the surface layer, stably acquires true information about deep microcirculation, and effectively suppresses the artificially high influence of static noise.

A system for regulating blood flow in extracorporeal circulation, and including a blood reservoir to receive blood from a patient, an oxygenator to condition the blood, a centrifugal pump to pump the blood from the blood reservoir to the oxygenator and back to the patient, an electronic remote clamp to regulate flow of the blood, and a controller to operate in a flow control mode and a speed control mode. The controller includes an operational element to set a blood flow value in the flow control mode and to set a speed of the centrifugal pump in the speed control mode. The controller to automatically switch between the flow control mode and the speed control mode in response to one or more trigger conditions and to automatically switch between the speed control mode and the flow control mode in response to opening the electronic remote clamp.

The application discloses a diving decompression sickness dynamic prediction and risk assessment system of multi-tissue parallel computation, relates to the fields of diving medicine, high-pressure medicine and human physiology modeling, and comprises a tissue unit planning module, a central blood circulation and coupling module and a model calculation and risk assessment module. The system divides a human body into a plurality of core physiological tissue units, and plans each tissue unit as a hybrid model composed of three sub-units of "fast-middle-slow". Then, the system simulates a human circulatory system by defining cardiac output, arterial blood inert gas partial pressure and dynamically distributing blood flow according to the tissue type, so as to construct a simulation model. Finally, according to the environmental pressure-time profile corresponding to a diving plan and the breathing gas composition, the simulation model is used to parallelly calculate the inert gas tension of all tissue units and sub-units, so as to be used for dynamic prediction and risk assessment of decompression sickness. The application provides a higher safety margin for saturation diving and repeated diving.

A renal failure blood therapy system includes a memory device storing a therapy target for a patient. The system also includes a processor configured to receive the therapy target for the patient, receive a desired solute concentration for the patient, and apply the therapy target and the desired solute concentration as inputs to an optimization routine. The processor is also configured to execute the optimization routine to determine at least one dialysis therapy prescription specifying at least a dialysis therapy duration, a dialysis therapy frequency, and at least one of a dialysis therapy blood flow rate or a dialysis therapy dialysate flow rate. The processor is further configured to display the at least one dialysis therapy prescription for confirmation or selection by a clinician and transmit the selected or confirmed dialysis therapy prescription to a dialysis machine for a subsequent dialysis treatment for the patient.

The application discloses a kind of based on flexible ultrasonic Doppler and AI blood vessel tracking blood flow noninvasive monitoring device, belong to intelligent medical monitoring field.The device includes: flexible ultrasonic Doppler sensor, for attaching body surface signal acquisition;Processing unit and the artificial intelligence analysis module in it, for automatic identification tracking blood vessel and calculate its cross-sectional area and blood flow velocity, and then obtain real-time blood flow;And optional pressure adaptive stabilization module, for dynamic adjustment of adhering pressure according to signal quality to maintain monitoring stability.The application realizes the continuous, noninvasive, automatic monitoring of arterial blood flow, with the advantages of high precision, strong anti-interference, convenient for clinical integration, suitable for perioperative period and critical patient hemodynamic management.

A dynamic image analysis apparatus including a hardware processor that: obtains a chest dynamic image obtained by dynamic radiographing through radiation; extracts a lung field region from the dynamic image; calculates a feature amount about a blood flow rate, based on the lung field region; and limits a value of the calculated feature amount about the blood flow rate.

The application discloses a brain tumor disease treatment effect evaluation method, and belongs to the technical field of radiotherapy plan evaluation, and specifically comprises the following steps: acquiring patient brain multi-modal image data and extracting three-dimensional tumor regions and corresponding perfusion parameters; constructing a biological target region hierarchical structure containing tumor overall regions and hypoxic subregions; obtaining a relative hypoxia degree parameter by calculating the cerebral blood flow ratio of the hypoxic subregion to other regions of the tumor; deconstructing historical treatment case data to establish a dose-therapeutic effect correlation parameter set; training a dose adjustment strategy model for the hypoxic subregion; and generating a final radiotherapy dose plan scheme according to the dose adjustment value output by the model combined with a clinical guideline basic dose. The application overcomes the limitations of traditional uniform dose irradiation through a data-driven dose decision mechanism, thereby providing an objective and reliable evaluation basis for clinical selection and optimization of personalized treatment schemes.

This application discloses a method, apparatus, device, storage medium, and program product for determining blood flow rate. Applied to ventricular assist devices, the ventricular assist device includes a blood pump motor and a blood pumping catheter connected to the blood pump motor. The method includes: acquiring first operating information of the blood pump motor, a first usage duration of the blood pumping catheter, and first hemodynamic parameter information of a target object; wherein the target object includes the object on which the blood pump motor acts; inputting the first operating information, the first usage duration, and the first hemodynamic parameter information into a blood flow rate determination model to obtain the blood flow rate output by the blood flow rate determination model. According to the embodiments of this application, the blood flow rate is comprehensively determined by considering factors such as the usage duration of the blood pumping catheter and the hemodynamic parameters of the target object, thereby improving the accuracy and robustness of the blood flow rate determination.

This invention discloses a method, apparatus, device, and storage medium for controlling a heart pump. The method includes: acquiring a target blood flow value of a target object; inputting the target blood flow value into a pre-trained target preload prediction model to obtain a preload prediction value; and adjusting the rotational speed of the target heart pump based on the preload prediction value and a preset preload reference standard. This invention addresses the safety issues inherent in prior art where heart pump rotational speed is controlled by collecting blood pressure and blood flow signals. It allows for adjustment of the heart pump rotational speed based on the object's preload prediction value, thereby improving the safety of the heart pump rotational speed control process.

A stent and methods for use of the stent are provided. The stent is positionable in a blood vessel adjacent an opening to an aneurysm. The stent is configured to deflect portions of blood flow away from the opening to the aneurysm to decrease the amount of blood flow entering the aneurysm and decrease the rate at which blood floor enters the aneurysm, and / or increase the amount and control the direction of the blood flow out of the aneurysm.

The present disclosure provides compositions and methods for treating pulmonary hypertension. The compositions and methods are based on administering a NO-releasing compound, such as nitrite, to a subject in need thereof in an amount sufficient to increase the level of circulating nitric oxide (NO), a potent vasodilator, thereby reducing the subject's blood pressure and increasing blood flow.

The present application relates to the technical field of medical rehabilitation and physical therapy, and particularly relates to a highland closed-loop controlled cervical and lumbar deep tissue precise thermotherapy and temperature monitoring system, comprising the following modules: a physiological signal acquisition module, which is used for acquiring the surface temperature, deep tissue temperature, microcirculation blood flow and muscle group electrophysiological signal of the cervical and lumbar region, and synchronously calibrating each signal to form multi-parameter physiological state data; a highland physiological compensation model construction module, which is used for performing highland environment physiological compensation on the tissue heat transfer coefficient and heat dissipation rate according to the blood oxygen level and blood flow velocity in the physiological state data, and obtaining the tissue heat transfer parameters which are corrected by the highland characteristics. In the present application, the multi-parameter physiological signals are acquired and the highland physiological compensation is performed, the deep temperature is controlled by combining the closed-loop thermotherapy and safety monitoring, and then the individualized dynamic adjustment precise thermotherapy is formed, so that the problem that the deep temperature is difficult to stabilize caused by the fixed power heating of the traditional cervical and lumbar thermotherapy is improved.

Provided is a coronary blood flow measurement device capable of acquiring significant information for determination of ischemic heart disease caused by stenosis or the like in a coronary blood vessel on the basis of measurement of a blood flow (coronary blood flow) in a blood vessel (coronary blood vessel) of a heart. This coronary blood flow measurement device (10) includes: a CFR acquisition means (12) for acquiring a calculated value of coronary blood flow reserve (CFR); and a cCFR calculation means (14) for obtaining a blood pressure correction CFR (cCFR) by converting the calculated value of the coronary blood flow reserve (CFR) acquired by the CFR acquisition means into a value under a condition of an arbitrary specific value (ΔPs) of an arteriovenous pressure difference (ΔP(a-v)) by using a linear relationship between a maximum hyperemia coronary blood flow (Q(hyp.)) and the arteriovenous pressure difference (ΔP(a-v)).

Techniques and apparatuses are described for determining an estimated cardiac output of a patient during a dialysis treatment. In one embodiment, for example, an apparatus can include a memory and logic coupled with the memory. The logic can be configured to determine an upper body oxygen consumption of the patient, determine, during the dialysis process, a hemoglobin concentration and a venous oxygen saturation, as measured via an optical blood monitor operably coupled to an extracorporeal circuit of a dialysis system performing the dialysis process, an arterial oxygen saturation as measured via a pulse oximeter operably coupled to the patient, an arterial-venous oxygen content difference based on the arterial oxygen saturation and the venous oxygen saturation, and an upper body blood flow (UBBF) as (the upper body oxygen consumption) / (the arterial-venous oxygen content difference), and determine a treatment recommendation based on the upper body blood flow. Other embodiments are also described.

The application discloses a blood flow monitoring control system, method, medium and equipment for ECMO, and relates to the technical field of flow monitoring. The system comprises a data acquisition module configured to acquire blood pump rotating speed, pressure and flow data in an extracorporeal circulation loop; a model construction module configured to establish a blood flow dynamics mathematical model containing a loop, a centrifugal blood pump, a membrane lung and a patient, and draw a rotating speed, pressure difference and flow relationship graph according to the blood flow dynamics mathematical model; and an abnormality judgment module configured to compare the acquired blood pump rotating speed, pressure difference and flow data with the rotating speed, pressure difference and flow relationship graph, and judge whether the blood flow, pressure difference and flow relationship are abnormal. The application can simultaneously consider the influence of both pressure and rotating speed on blood flow, so that more accurate real-time monitoring of blood flow is realized.

This invention belongs to the field of nuclear medicine imaging technology, specifically relating to a PET myocardial blood flow quantitative optimization method, including the following steps: determining the shortest effective acquisition time: for specific types of research subjects and pathophysiological states, the injection time is determined through experimental analysis. 18 After F-Flurpiridaz, the shortest effective acquisition time required to achieve stable myocardial blood flow (MBF) quantification is achieved; an optimized acquisition protocol is implemented; image reconstruction and MBF quantification are performed based on the optimized acquisition time; results are verified and reported. This invention significantly improves scanning and quantification efficiency: by shortening the effective acquisition time by 2-7 minutes, the occupancy time of the PET scanner can be substantially reduced while ensuring data quality, increasing equipment turnover and enabling more subjects to be examined within the same time period.

A method and apparatus for processing MRI data on changes in local brain function and blood perfusion, the method comprising: (1) collecting T1-weighted imaging, T2-weighted imaging, diffusion-weighted imaging, high-resolution T1-weighted imaging, resting-state fMRI, and 3D-pCASL sequence imaging for each subject on an MRI scanner; (2) processing the resting-state fMRI to obtain the following indicators: local consistency ReHo, low-frequency amplitude ALFF, and low-frequency amplitude fraction fALFF; (3) processing the 3D-pCASL sequence imaging to obtain perfusion indicators in each brain region, including mean cerebral blood flow mCBF, arterial transit time ATT, and arterial cerebral blood volume aCBV; (4) performing statistical analysis between patients and healthy controls on the data obtained in steps (2) and (3), and using correlation analysis to determine the correlation between statistically significant indicators and scale scores.

This invention discloses a method and system for calculating brain region blood flow based on time-frequency near-infrared brain imaging, belonging to the field of healthcare informatics technology. It converts light intensity data obtained from time-frequency near-infrared brain imaging into electrical data, and calculates and post-processes the electrical data using a modified Lambert-Beer law to generate a relative blood flow distribution chromatogram of the brain region under test. Simultaneously with the calculation and generation of the relative blood flow distribution chromatogram, a mental health assessment is conducted on the subject, and the relative blood flow distribution chromatogram is used to assist in evaluating the subject's mental health assessment results. This invention employs a novel multi-ring regular hexagonal honeycomb mesh structure construction method and sets a corresponding optical pole arrangement, significantly increasing the number of effective channels for calculation per unit area. Based on the modified Lambert-Beer law, it considers individual influencing factors, making the information expressed by the generated relative blood flow distribution chromatogram more accurate and comprehensive.

According to an apparatus and a method for detecting deepfake in real time through non-contact bio-signal measurement proposed in the present invention, a non-contact bio-signal is extracted from a face region in a video captured by an RGB camera, a deep learning model is trained using the extracted non-contact bio-signal, and it is determined whether the face is a real human face on the basis of a change in blood flow volume caused by a heartbeat, thereby enabling detection of a spoofing attack using deepfake technology.

A measurement arrangement for measuring carbon dioxide partial pressure of exhaled air from a person includes a calculation unit, a carbon dioxide analyser device, and a gas conduit assembly. A perturbation volume member is provided, defining a predetermined known perturbation volume, and configured to be selectively connected and disconnected to a person such that both inspiratory and expiratory air flows can pass either through the perturbation volume member or not, thereby introducing a variation of the determined end-tidal carbon dioxide. The perturbation volume member is either a gas conduit, or a perturbation space conduit which is configured to be connected to and disconnected from the gas conduit. The calculation unit is configured to calculate the effective pulmonary blood flow (EPBF) and the effective lung volume (ELV) based upon these induced variations of the determined end-tidal carbon dioxide partial pressure, the known perturbation volume, and a respiratory rate.

The present invention provides a medicament for preventing and / or treating a disease or condition associated with a decrease in brain blood flow, comprising vascular endothelial cells positive for a CD157 cell surface marker, wherein the cells are from a mammal, wherein the medicament is used so that the vascular endothelial cells are delivered into a brain; and a medicament for regenerating brain blood vessels, comprising vascular endothelial cells positive for a CD157 cell surface marker, wherein the cells are from a mammal, wherein the medicament is used so that the vascular endothelial cells are delivered into a brain.

This invention provides a biodegradable zinc alloy stent in vitro fatigue testing system, comprising a biomimetic human pulsating blood flow and pressure control system and a biomimetic coronary intervention vessel model. The outlet of the biomimetic human pulsating blood flow and pressure control system is connected to the left ventricular interface in the biomimetic coronary intervention vessel model to simulate the heart's pumping function. The inlet of the biomimetic human pulsating blood flow and pressure control system is connected to the drainage interface in the biomimetic coronary intervention vessel model to simulate blood return to the atria. Driven by the biomimetic human blood flow and pressure control system and combined with real human anatomical structures, this biodegradable zinc alloy stent in vitro fatigue testing system can realistically simulate clinical surgical procedures, achieving a high degree of human body environment simulation, dynamically adjusting blood flow and pressure, and being compatible with multiple simulated solutions.