19 results about "Diastole" patented technology

The invention provides a left heart data analysis method and system based on image segmentation, and relates to the technical field of medical image processing. Comprising the following steps: acquiring cardiac ultrasound image data and preprocessing; performing image segmentation on the preprocessed image data to obtain a segmentation result including a left ventricle, a left ventricular wall and a left atrium; searching a boundary line of the left ventricle and the left atrium, selecting two boundary points corresponding to the minimum and maximum abscissas in the boundary line as left and right mitral valve ring points respectively, and establishing a long axis based on the mitral valve ring midpoint and the cardiac apex point; modeling the ventricle into a structure formed by superposing a plurality of discs along the long axis direction, and obtaining the diameter of the corresponding disc; based on the obtained diameters of the corresponding discs, the left ventricular volumes in the diastolic period and the systolic period are calculated respectively, and the left ventricular ejection fraction is calculated. According to the method, image segmentation and geometric modeling are fused to achieve accurate calculation of the cardiac ejection fraction, meanwhile, the accuracy of cardiac structure image segmentation is improved, and an interpretable ejection fraction estimation process is achieved.

The invention discloses a myocardial stress determination method, device and equipment based on cardiac ultrasound and a medium, and relates to the field of myocardial stress evaluation.The method adopts a double-mapping network mode and comprises the steps that a cardiac medical image is acquired and labeled, and a feature database of the cardiac bimodal image in the systolic period and the diastolic period is constructed; constructing a first mapping network and performing training, and then performing segmentation and three-dimensional reconstruction on a to-be-processed cardiac ultrasound image to obtain a double-ventricle three-dimensional model; obtaining a finite element simulation model of the double ventricles and carrying out finite element simulation calculation to obtain a ventricle wall stress-strain simulation result; constructing a heart model-simulation result pairing database; constructing a second mapping network; training the second mapping network based on the heart model-simulation result pairing database; and determining a myocardial stress result based on the trained second mapping network. According to the method, the current situation that the myocardial stress cannot be effectively measured and evaluated by a traditional cardiac ultrasound method is effectively improved.

A medical system configured to deliver a plurality of pacing signals to a heart of patient. In examples, the medical system is configured to provide at least first pacing signal to cause or assist in causing a first cardiac cycle of the heart and a second pacing signal to cause and / or assist in causing a second cardiac cycle of the heart. The medical system the medical system includes processing circuitry configured to control an interval separating the first pacing signal and the second pacing signal to cause the second pacing signal to be subsequent to a diastole indicator of the first cardiac cycle.

This invention discloses an intelligent psychological guidance system for harmonizing the Qi of the internal organs based on TCM emotional differentiation, belonging to the field of medical electronic equipment. The system includes a multi-node physiological signal acquisition module, a central control and data processing module, and an acoustic intervention output module. The system synchronously acquires multi-channel bioimpedance, volumetric pulse wave, and electrocardiogram signals, extracts pulse wave conduction time and local blood perfusion index, constructs Qi characteristic parameters, and maps them to generate emotional tags. The central control module locks the target resonance unlocking frequency according to the tags, modulates low-frequency vibrations with reference audio to synthesize a multimodal signal, and further combines physiological pulse transmission delay to perform phase compensation, controlling the precise output of the intervention signal during ventricular diastole. Steady-state determination and closed-loop tracking are performed based on the dynamic gradient of impedance variance. This invention achieves objective quantification of TCM differentiation and ensures high-precision physical alignment between intervention energy and the hemodynamic state of the internal organs.

Methods, systems, and devices for cardiovascular health metric determination are described. A system may be configured to receive a photoplethysmogram (PPG) signal representative of a pulse waveform for a user. The pulse waveform may include a first local maximum, a downward slope following the first local maximum, and a curved feature representative of a transition from a systolic phase to a diastolic phase of a cardiac cycle. Additionally, the system may extract one or more morphological features from the pulse waveform and compare the one or more morphological features with one or more features from a plurality of baseline PPG signal morphologies associated with a plurality of chronological ages. The system may determine a cardiovascular health metric that indicates a cardiovascular health of the user relative to a chronological age of the user and cause a graphical user interface to display an indication of the cardiovascular health metric.

A physical treatment device for rehabilitation of an old cardia-cerebrovascular disease patient belongs to the technical field of physical treatment instruments and comprises a bed body, an electrocardiogram monitor is arranged on one side of the bed body, a mattress is placed at the top of the bed body and comprises a first supporting pad and a second supporting pad, and the first supporting pad and the second supporting pad are hinged through a rotating shaft at the joint. The second supporting pad is provided with a physical treatment assembly used for assisting the elderly patient in rehabilitation treatment, through cooperation with the cardiac cycle of the patient, in the diastolic period, the driving motor is meshed with the synchronous rack through an incomplete gear, the air bag is sequentially inflated from the far end of the limb to the near end of the limb, blood vessels are pressed, and blood is driven back to the aorta; important blood vessel perfusion is added, myocardial ischemia and other symptoms are relieved, the device automatically exhausts air after the diastolic period ends, it is ensured that blood smoothly flows to the lower limbs, meanwhile, the whole device is combined with a bed body, and good rehabilitation treatment exercise can be achieved for paralyzed and disabled patients.

This invention discloses a method and apparatus for heart sound segmentation based on a Hidden Markov Model (HMM) cardiac cycle. The method involves: extracting the signal envelope from the heart sound signal using Hilbert's algorithm; obtaining the peak positions of the first heart sound (S1) and the second heart sound (S2) after Hilbert envelope extraction based on preset baselines for different leads; locating the peaks based on the cardiac cycle; extracting the diastolic phase based on an improved HMM; locating the optimal time span of heart sound signals S1 and S2 using an improved Viterbi algorithm; and segmenting the original heart sound signal using the time span and the peak positions of S1 and S2. This invention employs an improved HMM and an improved Viterbi forward algorithm to calculate the duration of heart sound intervals S1 and S2, combined with the cardiac cycle, to accurately locate the peak positions of heart sound intervals, thus improving the performance of heart sound segmentation.

The present application relates to the field of electrical impedance imaging, and discloses a regional lung perfusion delay time analysis method, an electronic device and a storage medium. A dynamic image of conductivity change caused by blood perfusion in a human thoracic cavity is obtained. A blood perfusion image of a heart region and a blood perfusion image of a lung region are separated. A reference curve of conductivity change of the heart region is obtained according to the dynamic image of blood perfusion conductivity change and the blood perfusion image of the heart region. A conductivity change curve of each pixel point in the blood perfusion image of the lung region is obtained according to the dynamic image of blood perfusion conductivity change and the blood perfusion image of the lung region. The conductivity change curve is divided by a sliding time window, and a regional lung perfusion delay time is calculated in each time window. The time resolution advantage of electrical impedance imaging technology is fully utilized, and the time delay of the time when the local blood volume of the lung reaches the maximum relative to the end of the ventricular diastole is reflected by calculating the regional lung perfusion delay time.

This invention relates to the field of bio-optical imaging technology, specifically to an organ status assessment method and organ perfusion system based on laser speckle imaging. The method utilizes high-frame-rate laser speckle imaging technology combined with a physiological signal gating algorithm. It extracts the original speckle image only during the diastolic window when organ motion is minimal. The original speckle image is then preliminarily corrected using a vibration-speculiar distortion model. Subpixel-level registration is then performed on the preliminarily corrected speckle image using optical flow, generating a high signal-to-noise ratio microcirculation perfusion distribution map free of motion artifacts. Based on the microcirculation perfusion distribution map, perfusion heterogeneity indices for each target assessment region are calculated to determine whether local blood flow abnormalities exist in the transported organ, thus achieving status assessment and real-time monitoring of the transported organ. This assessment method is applicable not only to organ transport but also to organ quality evaluation and immediate post-transplant assessment scenarios.

The application discloses a blood pressure calculation method and equipment based on cross-scale fluid-solid coupling and considering nonlinear biomechanical characteristics of an aorta, and the method comprises the following steps: establishing a three-dimensional ideal aorta geometric model; establishing a zero-dimensional heart lumped parameter model to simulate the process that the heart pumps blood to the aorta inlet through periodic contraction and diastole; establishing a zero-dimensional three-element Windkessel model of small arteries to simulate blood flow microcirculation of peripheral small arteries; establishing a blood vessel wall biomechanical model containing residual stress of the aorta wall and active contraction of smooth muscle cells to obtain a pressure-radius relationship of the aorta wall as a fluid wall boundary condition to simulate the change process of the aorta radius in blood circulation; and coupling the three-dimensional ideal geometric model of the aorta, the zero-dimensional heart lumped parameter model and the zero-dimensional three-element Windkessel model to construct a cross-scale fluid-solid coupling system of hemodynamics, and the blood pressure in the aorta is calculated through iterative solution.

A device for protecting debris from entering coronary arteries, the device including an expandable frame, and a debris blocking obstacle, wherein the expandable frame is shaped and sized to expand against walls of an ascending aorta. A method of reducing damage to the heart during a vascular procedure including identifying a potentially debris-causing event, and reducing debris carried by backflow from an aorta into a coronary artery during diastole in response to the identifying. A method for protecting debris from entering coronary arteries during a medical procedure, the method including inserting a device for protecting debris from entering coronary arteries into an aorta of a patient, positioning the device to protect debris from entering the coronary arteries, and performing the medical procedure on a heart of the patient. Related apparatus and methods are also described.

Devices, systems and methods affect cardiac function of a patient by delivering a stimulation to a right hemisphere of a diaphragm of the patient during a diastolic phase of a cardiac cycle of the patient, wherein the stimulation results in an asymptomatic, transient, partial contraction of the right hemisphere of the diaphragm; and delivering a stimulation to the left hemisphere of the diaphragm during a systolic phase of the cardiac cycle, wherein the stimulation results in an asymptomatic, transient, partial contraction of the left hemisphere of the diaphragm.

This invention discloses a parameter identification method for a lumped parameter model of systemic circulation, belonging to the field of lumped parameter model technology. The method includes: constructing the state equation of the lumped parameter model of systemic circulation based on Kirchhoff's voltage and current laws to obtain the systemic circulation control equation; calculating the duration ratio of systolic to diastolic phases and stroke volume based on routine clinical measurement data, constructing classic aortic pressure and flow waveforms, and performing registration processing; calculating central venous pressure and flow based on routine clinical measurement data; and using the registered aortic inlet pressure and flow, central venous pressure and flow, and systemic circulation control equations to calculate the values ​​of each parameter in the parameter model. This invention, by periodically stretching the classic reference waveform, matches the waveform extreme values ​​with the patient's measured blood pressure and cardiac output, indirectly reconstructing the aortic inlet pressure and flow curve reflecting individual characteristics under non-invasive conditions, significantly improving the model's individualization and clinical compatibility.

The invention relates to a self-adaptive control artificial heart valve testing device. The testing device comprises a pulsation generation module used for generating pulsation fluid simulating systole and diastole of the heart; the sensing feedback system is used for carrying out data acquisition on the pulsating fluid and feeding back the acquired fluid data to the control system; the control system is used for adaptively adjusting working state parameters of the pulsation generation module, the liquid volume execution unit and the liquid resistance execution unit according to the fluid data so as to realize pulsating flow in a near physiological state; and the valve loading module is used for installing a to-be-tested heart valve prosthesis, so that the heart valve prosthesis can be tested by utilizing pulsating fluid in a near-physiological state, and a testing device which can realize stable and continuous pulsating flow close to a real physiological state in vitro and has self-adaptive regulation and control capability is realized. The method is of great significance to simulation of pathological states of different patients, improvement of data consistency among laboratories and acceleration of research, development and manufacturing of artificial heart valves.

A diastole-based hemodynamic index, such as instantaneous wave-free ratio (IWFR), may be calculated noninvasively for a patient by receiving image data respective of an anatomical region of the patient, creating an electronic model of the anatomical region, creating one or more boundary conditions model value sets representative of flow conditions during diastole, calculating one or more pressure drops at a location in the anatomical region, and determining, based on the calculated pressure drop(s) and based on a reference pressure, a hemodynamic index value, such as IWFR, for the location.

The utility model discloses an inflation-free trachea cannula which comprises a trachea cannula body and a connector. An inflation-free sleeve bag is arranged at the patient end of the trachea cannula body, a pull rope is connected with the inflation-free sleeve bag after passing through the trachea cannula body so as to be used for controlling contraction of the inflation-free sleeve bag and further achieve expansion of the inflation-free sleeve bag to seal an airway of a patient, and the inflation-free sleeve bag is of a circular truncated cone structure. The utility model can be suitable for patients with different human anatomy structures, and can reduce the operation procedure of inflating the cuff by medical personnel in an operation; the situation that treatment is delayed due to tracheal intubation caused by cuff breakage is reduced; airway mucosa necrosis and postoperative scar stenosis of a patient caused by excessive inflation can be reduced; breathing machine related pneumonia caused by the fact that secretions enter the body of the patient due to too little inflation or wrinkles of the inflation-free cuff can be reduced; the phenomenon that the trachea cannula falls off due to movement of a patient during an operation can be reduced; when secretions or gastric reflux substances enter the airway of the patient, the secretions can be received more easily.

The application relates to the technical field of myocardial strain analysis systems, and discloses an intelligent management and control method and device for a myocardial strain analysis system, which comprises the following steps: when a user logs in the myocardial strain analysis system and has a myocardial strain analysis demand, target cardiograms are determined from a preset heart image database according to analysis demand parameters of the user; image processing is performed on the target cardiograms to obtain processing results corresponding to the target cardiograms; myocardial strain analysis is performed on the target cardiograms according to the processing results and the analysis demand parameters, myocardial strain analysis results corresponding to the target cardiograms are obtained, and the myocardial strain analysis results are provided for the user to check. It can be seen that the application can perform image processing and myocardial strain analysis operation on the target cardiograms based on the analysis demand parameters of the user, reduces human analysis dependence, improves the intelligence, reliability and accuracy of myocardial stress analysis, and is thus favorable for accurately determining the contraction and diastole of the heart based on the target cardiograms.

The invention discloses a radial artery compression pressure dynamic regulation and control method based on a multi-mode sensing array. The method comprises the steps that compression signals, motion state data and body position change data of a radial artery area are collected in real time; identifying motion artifacts based on the motion state data and the body position change data, and extracting a pressure interference mode induced by the body position change; determining a sensitive area switching strategy and a corresponding pressure regulation rule according to the motion artifact recognition result and a pressure interference mode; based on the historical blood pressure data, the real-time physiological parameters and the blood flow characteristic parameters, a diastolic stage pressure reference value is output, and a diastolic stage compression pressure threshold value is subjected to prospective regulation and control; according to the sensitive area switching strategy and the prospective regulation and control pressure threshold value, the pressure applying force and area distribution of the radial artery compression device are dynamically adjusted through a parallel optimization algorithm. Through the scheme of the embodiment of the invention, the problems of misjudgment and control oscillation caused by external disturbance can be reduced.

The present invention relates to a prosthetic device for deployment in the native aortic valve region of a heart, comprising a tubular spacer element, the spacer element being configured for placement within the native aortic valve region of a heart without contacting to the native aortic annulus; the prosthetic device further comprises at least one anchoring element designed for anchoring the prosthetic device within the heart, and at least one connecting element, coupling the spacer element to the at least one anchoring element; in the prosthetic device, the tubular spacer element further comprises a coaptation skirt element being connected to the outer surface of the spacer element, such, that the coaptation skirt element is inflatable during diastole.