452 results about "Cardiac Ventricle" patented technology

The present disclosure provides a method and system for analyzing unipolar electrophysiological (EP) signals acquired by a multi-electrode catheter placed in a ventricle of a patient's heart. The method includes receiving unipolar EP signals, extracting unipolar far-field signals from the unipolar EP signals, and analyzing the extracted unipolar far-field signals to estimate the distribution of scar regions across a thickness of wall tissue of the ventricle. Using the estimated distribution, a unipolar far-field EP map showing the scar regions is generated. The method further includes displaying the unipolar far-field EP map including the scar regions to a user. The system comprises a display device and a processor configured to perform the steps of the method.

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 provides a method for constructing a CT-MRI (Computed Tomography-Magnetic Resonance Imaging) personalized three-dimensional heart model based on multi-modal imaging, which comprises the following steps of: firstly, carrying out myocardial and infarction region segmentation on a CMR-LGE image, and carrying out myocardial and intramyocardial adipose tissue segmentation on a CE-CT image to generate a corresponding Label image; then, a high-precision three-dimensional volume mesh model of the corresponding ventricle is constructed based on the segmentation results of the two types of images; and then, mapping the corresponding Label image with the tissue type to a corresponding finite element model according to the coordinates of the grid, and obtaining a corresponding personalized ventricular model with the tissue type. An interpolation method based on a general ventricular coordinate system is adopted, data of an MR ventricular model with infarct tissue attributes is transferred to a CT ventricular model, and therefore a mixed CT-MRI ventricular model is constructed. And finally, storing the constructed CT-MRI ventricular model data with the integrated tissue attributes as a standard geometric and topological file format.

A method is provided that includes inserting an inflow cannula of a left ventricular assist device (LVAD) of a LVAD system into a left chamber of a heart of a patient transeptally via a right atrium and a superior vena cava (SVC). An outflow cannula of the LVAD is coupled to a left subclavian artery or a left axillary artery. Other embodiments are also described.

The invention discloses an air supply method and an air supply system for a pulsating type ventricular assist device. The air supply method comprises the following steps: setting working parameters of the pulsatile ventricular assist device; the stroke range of the piston in the air pump is determined according to the working parameters; obtaining a piston position piecewise function based on the stroke range; the piston is driven to be at the working zero point, the air pump communicates with the pre-inflation equipment through the pre-inflation pipeline, the air pump is inflated through the pre-inflation equipment, and air pump pressure initialization is completed; and the pre-inflation equipment is disconnected, the air pump is communicated with the pneumatic execution part through the air supply pipeline, a piston in the air pump reciprocates according to the determined piston position piecewise function, the pressure in the air pump is periodically changed, and the pneumatic execution part is periodically and intermittently driven to work according to the sequence of inflation, high-pressure keeping, deflation and low-pressure keeping. The problem of air supply of a balloon, an extracorporeal membrane cavity and the like of an existing pulsatile ventricular assist device is solved.

The invention provides a heart model calibration method and system, electronic equipment and a medium. The heart model calibration method comprises the following steps: acquiring to-be-calibrated magnetocardiogram data by utilizing a sensor array; processing the to-be-calibrated magnetocardiogram data by using a time sequence so as to identify an R moment corresponding to a ventricular depolarization peak value; calculating based on the spatial distribution of the sensor array to obtain the direction of an equivalent current dipole at the R moment; and constructing a rotation matrix according to the long axis direction of the general heart model and the direction of the equivalent current dipole at the R moment, and calibrating the heart model corresponding to the to-be-calibrated magnetocardiogram data by using the rotation matrix. According to the heart model calibration method, the magnetocardiogram data can be automatically calibrated, and an accurate personalized heart model can be generated without depending on individual historical physiological data.

The invention relates to a flexible lockable rope-driven mechanical arm system for cardiac resection, which belongs to the technical field of minimally invasive interventional surgical instruments and comprises a flexible mechanical arm component, an end effector component, a near-end connecting seat and a locking component. The flexible mechanical arm assembly is formed by connecting a plurality of guiding discs and a plurality of locking pieces in series, the guiding discs are arranged at intervals, one locking piece is arranged every multiple guiding discs, and the guiding discs are connected with a driving rope in series through a length restraining rod. The near-end connecting base is used for being connected with a catheter sheathing canal or a mechanical arm driving base and providing an inlet for the length restraining rod and the multiple driving ropes. The end effector assembly is used for cardiac muscle resection; according to the flexible mechanical arm assembly, complex three-dimensional path planning in a narrow cardiac cavity and posture locking under a target posture can be achieved, and the positioning precision and posture stability in the myocardial resection process are improved. The end effector assembly includes a telescopic knife and a protective depth limiting structure that reduces the risk of penetrating the ventricular wall and damaging adjacent valves and conduction bundles.

The invention relates to the technical field of medical image processing and three-dimensional reconstruction, and particularly discloses a reconstruction and analogue simulation method based on a cardiac image. The method comprises the following steps: firstly, preprocessing an input CT or MRI medical image, and automatically segmenting a heart multi-tissue structure by using an nnUNetv2 model, including a plurality of anatomical regions such as atrium, ventricle, myocardial tissue and blood pool; and then performing topology repair, smoothing processing and label resampling on the segmentation result to obtain a three-dimensional label body with a continuous structure and a complete boundary. And based on the optimized tag body, constructing a heart three-dimensional surface model by adopting a Marching Cubes algorithm, and generating a multi-material volume grid suitable for finite element analysis. According to an electrode position and a radio frequency parameter set by a user, a radio frequency ablation simulation model based on a Pennes biological heat conduction equation and an Arrhenius model is established, a temperature field and a tissue thermal damage range are calculated, and a simulation result is displayed in a three-dimensional mode in an overlapping mode. According to the method, the integrated process from medical image automatic segmentation to heart three-dimensional reconstruction and thermal simulation is realized, the segmentation precision, the modeling efficiency and the simulation reliability are improved, and the method can be applied to application scenes such as surgical planning, preoperative evaluation and medical teaching.

Disclosed are a method for presenting cardiac myocardial strain and an ultrasound imaging apparatus, comprising: acquiring image data of myocardial segments of both left and right ventricles, and processing this data to obtain motion parameters of both left and right ventricular myocardial segments. A composite bull's-eye plot containing left and right ventricular bull's-eye subplots is displayed, wherein the left ventricular bull's-eye subplot comprises multiple left ventricular myocardial regions corresponding to the left ventricular myocardial segments and presenting motion parameters of the left ventricular myocardial segment; and the right ventricular bull's-eye subplot comprises a right ventricular myocardial region corresponding to the right ventricular myocardial segments that exclude some / all shared segments with the left ventricle and presenting motion parameters of the right ventricular myocardial segment. This configuration enables users to observe motion parameters of both ventricular myocardial segments, thereby providing comprehensive understanding of cardiac myocardial strain while enhancing clinical efficiency for doctors.

The utility model discloses a control device and a ventricular assist system. The control device is applied to the ventricular assist system, the ventricular assist system comprises a blood pumping catheter, and the control device comprises a power supply assembly used for providing a working power supply for the blood pumping catheter; the interface assembly is used for detecting the connection state of the blood pumping catheter and the control equipment; the power conversion assembly is electrically connected with the power supply assembly; the controller, the power supply assembly, the interface assembly and the power supply conversion assembly are electrically connected with the controller, and the controller is used for obtaining configuration information of the blood pumping catheter under the condition that the connection state is successful, so that the power supply conversion assembly is controlled to convert a working power supply provided by the power supply assembly according to the configuration information; the configuration information comprises the working voltage of the blood pumping motor. According to the embodiment of the invention, the system adapts to the functional requirements of different blood pumping catheters, adapts to various types of blood pumping catheters, reduces the development tasks of control equipment, reduces the cost, and reduces the loss.

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.

The invention relates to a multifunctional heart pulsation simulation system, which comprises a ventricle simulation mechanism, an atrium simulation mechanism, an artery simulation mechanism and a backwater mechanism, and is characterized in that the ventricle simulation mechanism comprises a ventricle cavity and a pulsation pump; the atrial simulation mechanism comprises an atrial cavity connected with the ventricular cavity and an atrial compliance cavity connected with the atrial cavity, and a first valve carrier is detachably mounted at the joint of the ventricular cavity and the atrial cavity; the artery simulation mechanism comprises an artery water inlet cavity connected with the ventricular cavity, an artery water outlet cavity connected with the artery water inlet cavity, an artery compliance cavity arranged at the top of the artery water outlet cavity and an artery root compliance cavity arranged at the bottom of the artery water outlet cavity; a second valve carrier is detachably mounted at the joint of the artery water inlet cavity and the artery water outlet cavity; the water return mechanism is connected between the atrial compliance cavity and the artery compliance cavity. According to the invention, two types of valves are simultaneously placed in the system for testing, so that the accuracy of a test result is effectively improved.

The invention provides a system and a method for drawing a ventricular contour and calculating ejection fraction by medical color Doppler ultrasound equipment. The system comprises an image acquisition and caching module for acquiring a plurality of frames of B-mode ventricular images; a background noise and ventricle distinguishing module obtains background noise and ventricle structure images; the contour boundary determination module obtains ventricle contour boundary points; the contour coordinate category distinguishing module performs category distinguishing on the ventricular contour boundary points and determines the position of the valve according to a category distinguishing result; a valve boundary point determination module determines a valve boundary point; the calculation module is used for calculating ventricular volume and ejection fraction; the display module is used for displaying the target ventricular image, the ventricular volume and the ejection fraction; according to the method, the requirement for noise can be effectively met, the ventricular contour can be accurately determined, the accuracy and efficiency of judging the cardio-pulmonary function can be guaranteed, and meanwhile the real-time state can be known more visually and efficiently through visual image superposition and numerical value display.

A mechanical circulatory support system may include a blood pump, a housing, an elongated shaft, a first sheath, and a second sheath. The blood pump may be configured to pump blood from the ventricles of a patient's heart to the patient's vascular system. The elongated shaft may be coupled to the blood pump and extends proximally from the blood pump to the housing. The first sheath may extend distally from the housing over the elongated shaft and include a cavity having an inner diameter. The second sheath may extend distally from the housing over the elongated shaft and include an outer diameter smaller than the inner diameter of the cavity of the first sheath. The first and second sheaths are configured for longitudinal adjustment along the elongated shaft, and the second sheath is configured to be adjusted via the first sheath.

The invention is entitled "Ventricular Far-Field Estimation Using Autoencoders." The invention provides a method. The method includes receiving input intracardiac signals from a monitoring and treatment device. Each of the input intracardiac signals includes artifacts. The method includes encoding, by an autoencoder, the input intracardiac signals with an intracardiac dataset to produce a latent representation. The method also includes decoding, by the autoencoder, the latent representation to produce output intracardiac signals. The output intracardiac signals include the input intracardiac signals reconstructed without the signal artifacts.

Implantable medical device for stimulating a heart includes a proximal electrode pole, and first and second distal electrode poles. During operation, the device performs: a) detecting an intrinsic atrial contraction of the heart; b) detecting an intrinsic ventricular contraction of the heart; c) determining a first intrinsic atrioventricular conduction time between i) the intrinsic atrial contraction or the stimulation of the atrium and ii) the intrinsic ventricular contraction detected with the first distal electrode pole; and determining a second intrinsic atrioventricular conduction time between i) the intrinsic atrial contraction or the stimulation of the atrium and iii) the intrinsic ventricular contraction detected with the second distal electrode pole; d) setting a stimulated atrioventricular conduction time for stimulating the ventricle of the heart with the first and / or second distal electrode poles, the stimulated atrioventricular conduction time being shorter than the shorter of the first and second intrinsic atrioventricular conduction times.

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.

In some examples, controlling delivery of CRT includes controlling an implantable medical device to deliver ventricular pacing according to a sequence of different values of a CRT parameter and acquire first and second electrograms from respective first and second electrode vectors. For each value of the CRT parameter, a value of a comparison metric of a first activation interval between a first fiducial point of a cardiac cycle detected in the first electrogram and an occurrence of a second fiducial point of the cardiac cycle and a second activation interval between the first fiducial point and the occurrence of the second fiducial point detected in the second electrogram can be determined. A target value of the comparison metric can be identified and an updated value of the CRT parameter determined based on the target value. The system can then control the IMD to deliver ventricular pacing at the updated value of the CRT parameter.

The application discloses an ultrasonic probe capable of directly reaching into a heart chamber in a heart operation and relates to the technical field of medical devices. The ultrasonic probe comprises a fixing frame arranged around the heart chamber, the fixing frame being connected with the skin of a patient; a telescopic rod being perpendicular to the fixing frame and being connected with the fixing frame through a spherical hinge, the telescopic rod being capable of extending into the heart chamber of the patient; an ultrasonic probe being arranged on the side wall of the end of the telescopic rod away from the fixing frame, the ultrasonic probe being arranged in the circumference of the telescopic rod, and the ultrasonic probe being provided with a plurality of ultrasonic probes; and a camera being arranged at the end of the telescopic rod away from the fixing frame. The length of the ultrasonic probe extending into the heart chamber of the patient can be changed through the arrangement of the telescopic rod, and the different heart chambers of different patients can be detected. The ultrasonic probe can be fixed on the skin of the patient through the arrangement of the fixing frame. The telescopic rod can be rotated according to the different positions of the diseased parts of different patients through the spherical hinge connection between the fixing frame and the telescopic rod, so that the ultrasonic probe can be in a better detection position.

The invention provides a ventricular elasticity value estimation method and device.The method comprises the steps that a first parameter and a second parameter are obtained, the first parameter comprises at least one of target ventricular pressure, target aortic pressure and target pulmonary arterial pressure of a target user, and the second parameter comprises at least one of the target ventricular pressure, the target aortic pressure and the target pulmonary arterial pressure; the second parameter comprises the pumping flow of the target ventricular assist device and the cardiac cycle of the target user; inputting the first parameter and the second parameter into a target decision model, and outputting a target ventricular volume; and estimating a target ventricular elasticity value according to the ratio of the target ventricular pressure to the target ventricular volume. The ventricular volume of the current user is estimated through the decision model, the estimated ventricular elasticity value is calculated according to the ratio of the ventricular pressure to the ventricular volume, and the ventricular elasticity value of the patient can be accurately predicted in real time without depending on ultrasonic equipment.

Techniques for determining whether a ventricular depolarization is a premature ventricular contraction (PVC) depolarization can include processing circuitry of a medical system that identifies an interval from a maximum slope point to a minimum slope point of each of a plurality of ventricular depolarizations and, for each of the plurality of ventricular depolarizations as a current ventricular depolarization, determines that an interval from a maximum slope point to a minimum slope point of the current ventricular depolarization, a previous adjacent ventricular depolarization of the plurality of ventricular depolarizations, and a subsequent adjacent ventricular depolarization of the plurality of ventricular depolarizations satisfies one or more slope criteria. The processing circuitry determines, based on the interval from the maximum slope point to the minimum slope point that satisfies the one or more slope criteria, that the current ventricular depolarization is a PVC depolarization.

The invention discloses an intelligent artificial heart valve integrated with pressure sensing, which comprises an implantation end and a body surface relay patch, the implantation end comprises a stent valve main body, a valve crossing pressure sensor pair, a microelectronic module and a flexible circuit, and the stent valve main body comprises a valve frame and a valve leaflet. The transvalvular pressure sensor pair comprises a first pressure sensor fixed to the ventricular proximal side of the stent valve body and a second pressure sensor fixed to the ventricular distal side of the stent valve body, leads of the pressure sensors are electrically connected with the microelectronic module through a flexible circuit, and the flexible circuit comprises a planar spiral coil; the plane spiral coil is electrically connected with the microelectronic module, the body surface relay patch comprises an external read-write coil, the external read-write coil transmits energy to the plane spiral coil, and the cross-lobe pressure sensor sends sensed data to the external read-write coil through the plane spiral coil. According to the invention, abnormal early warning can be realized, the treatment lagging is shortened, and the complication cost is reduced.

A ventricular assist device including a frame having a proximal end and an outer surface, and an anchor having a base and a brace coupled to the base. The base is attached to the proximal end of the frame. The device also includes a stator assembly coupled to the frame, a rotor assembly disposed between the stator assembly and the frame, and a power source operatively coupled to the stator assembly. The anchor is moveable between a collapsed configuration in which an inner surface of the brace contacts the outer surface of the frame, and an expanded configuration, in which the inner surface of the brace is offset from the outer surface of the frame and an outer surface of the brace engages a portion of the blood vessel to secure the frame within the blood vessel.

In some examples, a system can be used for delivering cardiac resynchronization therapy (CRT). The system may include a pacing device configured to be implanted within a patient. The pacing device can include a plurality of electrodes, signal generation circuitry configured to deliver ventricular pacing via the plurality of electrodes, and a sensor configured to produce a signal that indicates mechanical activity of the heart. Processing circuitry can be configured to identify one or more features of a cardiac contraction within the signal, and determine whether the contraction was a fusion beat based on the one or more features.

The invention discloses a BCG heartbeat detection system, a training method and a detection method, and belongs to the technical field of medical signal processing. According to the method, a heart electro-mechanical coupling mechanism is utilized, physiological semantics implied in a BCG signal segment are mined through a cross-modal semantic anchoring module and a fine-grained waveform reconstruction module, and the physiological semantics are converted into heartbeat indication signals of QRS waves; wherein the cross-modal semantic anchoring module is used for extracting implicit ventricle depolarization global semantics by capturing a long-range dependency relationship in a BCG signal fragment so as to roughly lock a semantic anchor point of heartbeat generation in an uncertain waveform; and the fine-grained waveform reconstruction module fuses the global semantic features into the local waveform features through a cross attention mechanism to realize dynamic fusion and alignment of the morphological features and the semantic features. Based on the method, the dependence of a traditional method on BCG waveform form consistency is overcome, and accurate and robust heartbeat detection can be achieved under complex and changeable pathological conditions.

The application provides an atrial stent and relates to the technical field of medical devices.The atrial stent comprises a ball cage, a cylindrical stent, a sealing membrane and an artificial valve; the ball cage is supported in an atrium, and a ball cage opening is formed in the bottom end of the ball cage; the cylindrical stent extends from the ball cage opening to the inside of the ball cage; the sealing membrane covers the bottom of the ball cage and the cylinder wall of the cylindrical stent; and the artificial valve is located in the cylindrical stent.In the application, the ball cage is supported in the atrium after surgery, and the structure is stable, so that relative displacement of the ball cage and the original valve cannot be caused by the beating of the heart or the flushing of blood; and the blood in the atrium can flow into the ventricle through the cylindrical stent; the original valve still maintains the original function; the artificial valve and the original valve form a double-valve structure; and the regurgitation caused by the incomplete closure of the original valve during the output of the blood in the ventricle is blocked by the artificial valve, so that the functional defects of the original valve are complemented, and an ideal interventional treatment effect can be achieved.

The application relates to the field of medical devices, in particular to an implant capable of avoiding interlayer reflux, which comprises an anchoring device, a closing aid, and an adjusting mechanism, the closing aid is fixed on atrial tissue through the anchoring device, one end of the adjusting mechanism is connected with the closing aid, and the other end of the adjusting mechanism is fixed on ventricular tissue or apical tissue, the closing aid comprises a first patch and a second patch, one side of the first patch close to the anchoring device is a root, and the other side of the first patch away from the anchoring device is a head, wherein the first patch is arranged above the second patch, and the first patch and the second patch cooperate to form a pocket structure with an opening direction towards the head direction; the application can effectively avoid the existence of a gap between the closing aid and the autologous valve leaflet, so that blood flowing into the gap can be prevented from being accumulated into thrombus, calcified and other adverse conditions, and the application has good clinical significance.

A medical device is configured to deliver atrioventricular junction stimulation (AVNS) therapy for suppressing atrioventricular junction conduction by generating a pulse train in accordance with atrioventricular junction stimulation (AVNS) control parameters. The medical device may deliver ventricular pacing pulses and determine that a threshold number of ventricular pacing pulses are delivered while delivering the AVNS therapy. The medical device may adjust at least one AVNS control parameter in response to determining that the threshold number of ventricular pacing pulses has been delivered.

This invention discloses a method for preparing a simulated heart model and the simulated heart model itself. The method for preparing the simulated heart model includes: dividing a digital heart model into two parts along its coronal plane; preparing corresponding molding molds according to the structural characteristics of the two parts, each molding mold including an outer molding mold and an inner cavity molding mold; applying silicone to the molding surfaces of the outer molding mold and the inner cavity molding mold to form the endocardium and epicardium; applying silicone to the portion of the inner cavity molding mold used for molding the valve to form the valve; assembling the outer molding mold and the inner cavity molding mold to form a cavity; sequentially injecting silicone of corresponding hardness into the regions of the cavity used for molding the atrial myocardium, interatrial septal myocardium, ventricular myocardium, and interventricular septal myocardium to form heart model halves; and bonding the heart model halves corresponding to the two molding molds together to obtain the simulated heart model.

Example systems, devices, and techniques are disclosed. An example system includes an implantable medical device (IMD) configured to obtain the cardiac EGM of the patient. The IMD is configured to determine, based on the cardiac EGM, a first event and a second ventricular event. The IMD is configured to determine a first time interval between the first event and the second ventricular event satisfies a first time interval threshold, indicating a short interval event pair. The IMD is configured to determine whether the short interval event pair is a result of oversensing. The IMD is configured to increment or refrain from incrementing a counter based on the determination of whether the short interval event pair is the result of oversensing. The IMD is configured to determine, based at least in part on a count of the counter, whether to send a lead integrity alert.