75 results about "Heart structure" patented technology

The invention relates to leadless cardiac pacemakers (LBS), and elements and methods by which they affix to the heart. The invention relates particularly to a secondary fixation of leadless pacemakers which also include a primary fixation. Secondary fixation elements for LBS's may passively engage structures within the heart. Some passive secondary fixation elements entangle or engage within intraventricular structure such as trabeculae carneae. Other passive secondary fixation elements may engage or snag heart structures at sites upstream from the chamber where the LBS is primarily affixed. Still other embodiments of passive secondary fixation elements may include expandable structures.

A splint assembly for placement transverse a heart chamber to reduce the heart chamber radius and improve cardiac function has a tension member formed of a braided cable with a covering. A fixed anchor assembly is attached to one end of the tension member and a leader for penetrating a heart wall and guiding the tension member through the heart is attached to the other end. An adjustable anchor assembly can be secured onto the tension member opposite to the side on which the fixed pad assembly is attached. The adjustable anchor assembly can be positioned along the tension member so as to adjust the length of the tension member extending between the fixed and adjustable anchor assemblies. The pad assemblies engage with the outside of the heart wall to hold the tension member in place transverse the heart chamber. A probe and marker delivery device is used to identify locations on the heart wall to place the splint assembly such that it will not interfere with internal heart structures. The device delivers a marker to these locations on the heart wall for both visual and tactile identification during implantation of the splint assembly in the heart.

An isolated heart preparation in which essentially normal pumping activity of all four chambers of the heart is preserved, allowing for the use of the preparation in conjunction with investigations of electrode leads, catheters, cardiac implants and other medical devices intended to be used in or on a beating heart. The preparation may also be employed to investigate heart functions, in the presence or absence of such medical devices. In order to allow for visualization of heart structures and devices located within the chambers of the heart, a clear perfusate such as a modified Krebs buffer solution with oxygenation is circulated through all four chambers of the heart and the coronary vasculature. The preparation and recordings of the preparation may be used in conjunction with the design, development and evaluation of devices for use in or on the heart, as well as for use as an investigational and teaching aid to assist physicians and students in understanding the operation of the heart.

A method and system for patient-specific modeling of the whole heart anatomy, dynamics, hemodynamics, and fluid structure interaction from 4D medical image data is disclosed. The anatomy and dynamics of the heart are determined by estimating patient-specific parameters of a physiological model of the heart from the 4D medical image data for a patient. The patient-specific anatomy and dynamics are used as input to a 3D Navier-Stokes solver that derives realistic hemodynamics, constrained by the local anatomy, along the entire heart cycle. Fluid structure interactions are determined iteratively over the heart cycle by simulating the blood flow at a given time step and calculating the deformation of the heart structure based on the simulated blood flow, such that the deformation of the heart structure is used in the simulation of the blood flow at the next time step. The comprehensive patient-specific model of the heart representing anatomy, dynamics, hemodynamics, and fluid structure interaction can be used for non-invasive assessment and diagnosis of the heart, as well as virtual therapy planning and cardiovascular disease management. Parameters of the comprehensive patient-specific model are changed or perturbed to simulate various conditions or treatment options, and then the patient specific model is recalculated to predict the effect of the conditions or treatment options.

The invention discloses a forging method of TC4 titanium alloy large-specification rods. TC4 cast ingots are selected; TC4 are drawn to deform according to a deformation of 40-60%, and are broken to obtain multiple forgings; second heating-number forging and third heating-number forging are performed on each forging; one-upsetting and one-drawing deformation is performed on each forging in secondheating-number forging and third heating-number forging; fourth heating-number forging is performed on each forging; one-upsetting and one-drawing deformation is performed; the forgings are rounded asrods of phi 200-phi 220 mm; fifth heating-number forging is performed on each rod of phi 200-phi 220 mm; and the rods are drawn to deform according to a deformation of 40-60%, and are rounded to formrods of phi 120 mm. The one-upsetting and one-drawing operation is adopted to replace traditional three-upsetting and three-drawing operation, so that the operation is simplified, the production costand the material loss are reduced, the material deformation degree is increased, the heart structures can be crushed more sufficiently, and the equiaxial property is achieved; and the blank forging temperature is gradually lowered along with the operation, crushing of grain particles and transformation of morphologies are facilitated, and the structure uniformity of the TC4 alloy large-specification rods is improved.

The invention relates to a medical examination and diagnosis method and instrument, in particular to a multi-dimensional electrocardio ultrasonic signal fusion computed tomography imaging system and method based on anatomical orientation. A multi-dimensional ultrasonic cardiac structure and a perfusion image technology are further integrated on the basis of a multi-dimensional electrocardiosignal imaging system and method, and a novel non-invasive platform is provided for recording and evaluating the electro-mechanical signal characteristic and myocardial perfusion characteristic of heart. The method is a unique electrocardio-mechanical function and perfusion synchronized computed tomography imaging method based on anatomical orientation, and the technology is a non-invasive imaging technology for detecting transmural cardiac electrical activity information and mechanical signals. By adopting the medical examination and diagnosis method and instrument, the diagnosis of myocardial diseases such as cardiac hypertrophy, cardiomyopathy, myocardial infarction and myocarditis, the determination of the origin of arrhythmia, and the like can be enhanced, and a brand-new diagnosis and guide treatment tool is provided for rapid real-time diagnosis of heart diseases.

The invention discloses a forging method capable of improving structure uniformity of a titanium alloy forging stock. Differential thermal analyzing is used for measuring the phase transformation temperature beta t of a titanium alloy blank to be forged; under the temperature from (beta t+100) DEG C to (beta t+150) DEG C, heat preservation is carried out for 4 hours to 6 hours, and the blank to beforged is forged into a square blank; the obtained square blank is subject to heat preservation for 2 hours to 4 hours at the temperature from (beta t-20) DEG C to (beta t-10) DEG C, second-heating forging is carried out, the obtained square blank is subject to free drawing until the deformation amount reaches 50% to 60% of the total deformation amount, and the square blank obtained after free drawing is obtained; the obtained square blank obtained after free drawing rotates by 45 degrees around the center axis of the length direction of the square blank, pressing is carried out, and the final square blank is obtained; and the macrostructure of the cross section of the forge blank obtained after machining is uniform, the grain boundary is clear, no special-shaped piebald defects exist, the microstructure is uniform and consistent, the whole is of a net basket structure or equal-axis structure, and the edge and heart structures have no difference.

The invention relates to an inorganic compound with a non-heart structure, and a preparation method and an application thereof as a nonlinear optical crystal. The crystal has a chemical formula of K2Au(IO3)5, belongs to an orthorhombic crystal system, has a space group of C[mc]2[1], and has crystal cell parameters of a=11.5949(8) angstroms, b=11.6905(6) angstroms, c=11.4716(6) angstroms, alpha=beta=gamma=90 DEG and Z=4. The yellow K2Au(IO3)5 crystal is prepared by a hydrothermal method. The powder frequency-doubling effect of the K2Au(IO3)5 crystal is 1.0 time that of KTiOPO4.

The invention discloses a preparing method of a high-uniformity TC11 alloy bar for a blade. A TC11 titanium alloy precision forging blank subject to blooming forging and two-phase area forging is taken and heated below the phase change point, precision forging machine-fire multi-pass precision forging is adopted to obtain a medium precision forging blank; the medium precision forging blank is heated and subject to empty burning under the phase change point, and the structural uniformity of the medium precision forging blank is improved; the medium precision forging blank with the uniform structure is heated below the phase change point, and precision forging machine-fire multi-pass precision forging is adopted to form a finished product bar or the precision forging blank is subject to endcutting and discharging to prepare a rolled blank; the precision forging finished product bar is heated and subject to empty burning below the phase change point, and preparing of the high-uniformityTC11 precision forging bar for the blade is achieved or the rolled blank is heated below the phase change point; transverse column type hot rolling machine-fire multi-pass rolling is adopted to obtainthe high-uniformity TC11 rolled bar for the blade. The finally-obtained TC11 alloy precision forging and rolling bar for the blade is uniform and consistent in transverse high-power side and heart structure, the performance is stable, the corresponding material standard needs are met, the batch consistency is good, and the high-quality needs of an engine for the blade TC11 alloy bar are met.

The invention discloses an infrared nonlinear optical crystal La3Sb0.33SiS7 and a preparation method thereof. The crystal is a non-heart structure sulfide, the crystal system is a hexagonal system, and the space group is P63. The preparation method comprises the solid-phase reaction of elemental lanthanum, elemental antimony, elemental silicon and elemental sulfur under vacuum. Under the irradiation of laser with the wave length of 2.05 [mu]m, the nonlinear effect of the infrared nonlinear optical crystal La3Sb0.33SiS7 corresponds to that of commercial nonlinear optical material potassium titanium phosphate (KTP).

A method for providing guidance in Cardiac Resynchronization Therapy (CRT) comprising: a) providing image data sets of the heart of a patient; b) creating a three-dimensional (3D) anatomical model of the cardiac structures; c) calculating myocardium infarct scar distribution; d) calculating heart mechanical activation data; e) superimposing the scar distribution and the mechanical activation data on the 3D anatomical model to obtain a 3D roadmap model including anatomical geometry and mechanical activation data. A corresponding device and computer program are also model disclosed.

The invention provides an electrophysiologic catheter with multilevel adjustable bends. The electrophysiologic catheter comprises a first-level adjustable bend section, a second-level adjustable bendsection, a handle, a first pull wire, a second pull wire and a plurality of guide wires, the first-level adjustable bend section comprises a first pipeline and a head electrode arranged at a far end of the first pipeline, two passageways are arranged in the first pipeline along the length direction of the same, the second-level adjustable bend section comprises a second pipeline, a far end of thesecond pipeline is connected with a near end of the first pipeline, three passageways are arranged in the second pipeline along the length direction of the same, two of the three passageways of the second pipeline are communicated with the two passageways of the first pipeline, and at least one ring electrode is arranged on an outer wall of each of the first pipeline and the second pipeline. The electrophysiologic catheter with multilevel adjustable bends is capable of adapting to all heart structures in one specification, so that operation is enabled to be more convenient.

The invention discloses a detachable heart model for teaching show. The detachable heart model comprises a simulated lung, a simulated body, a left heart model and a right heart model, wherein the left heart model comprises a left ventricle model, an aorta model, a left atrium model and a pulmonary vein model; the right heart model comprises a right ventricle model, a suprahepatic vena cava model,a right atrium model and a pulmonary artery model; one side of the left heart model is hinged with one side of the right heart model by virtue of a connector; the connector comprises a left heart connecting shaft, a right heart connecting shaft and an intermediate connecting shaft; the intermediate connecting shaft is connected between the left heart connecting shaft and the right heart connecting shaft; and light strips are arranged in the heart model, the simulated lung and the simulated body according to blood circulation. According to the detachable heart model disclosed by the invention,sorting of the heart structures can be changed according to the blood circulation process in the teaching process, and the flow sequence of blood in the heart is intuitively shown. Meanwhile, the structure of each part of the heart can be independently displayed, and the teaching efficiency is improved.

The invention provides a deep learning atrial septal defect detection method and device, and the method comprises the steps: obtaining an ultrasonic cardiogram, preprocessing the ultrasonic cardiogram, and extracting a region of interest; carrying out feature extraction on the region of interest, and identifying a subsword process atrial septal frontal section, a subsword process atrial septal sagittal section, a cardiac apex four-cavity cardiac tangent plane, a low-position paracarpal four-cavity cardiac tangent plane and a paracarpal aorta short-axis tangent plane; detecting the minimum distance point of the atrial septal defect; segmenting heart structures of a subsword atrial septal frontal section, a subsword atrial septal sagittal section, a cardiac apex four-cavity cardiac tangent plane, a low paracardial four-cavity cardiac tangent plane and a paracardial aorta minor axis section to obtain segmentation results, the heart structures including a left atrium, a right atrium, a left ventricle, a right ventricle, an aorta and pulmonary arteries; and according to the segmentation results, filtering the detected minimum distance point bounding box of the atrial septal defect, andtaking the filtered result as an atrial septal defect detection result.

This invention relates to a detection method for an instantaneous speed and an instantaneous acceleration of an anatomic M-typed kinetocardiogram, which is characterized by comprising an edge extracting module, a speed generating module and an acceleration generating module, wherein, the edge extracting module comprises a linear template, the invention chooses waveform of the anatomic M-typed kinetocardiogram of a certain part of a certain structure randomly in the anatomic M-typed kinetocardiogram, time discrete function differentiation is made for the waveform after the edge extracting is made so as to obtain the motion speed of every moment of the part, and then the time discrete function differentiation is made for the waveform again, thus obtaining the motion acceleration of every moment of the part (a repeating part). The invention can detect the motion speed and the motion acceleration of of every moment of every part of every heart structure accurately, thus disclosing the motion information of every part of the heart further in a noninvasive mode and providing important scientific evidences for the study of the diagnosis of the heart disease and the hemodynamics.

The invention discloses an in-vitro heart valve testing system and a testing method thereof, the testing system comprises a simulated heart, a circulating device and a monitoring device, the simulatedheart has a complete heart structure, a circulating path and a puncture port for simulating release of the heart valve, and the simulated heart is an animal isolated heart; the circulating device comprises power equipment and liquid storage equipment, and the power equipment is connected with a left ventricular apex part or/and a right ventricular apex part of the simulated heart and used for providing power for the simulated heart; the liquid storage equipment is used for providing circulating liquid for the test system; the circulating device is connected with the simulated heart to form aleft heart circulating system and/or a right heart circulating system, the left heart circulating system is used for testing a mitral valve and/or an aortic valve, and the right heart circulating system is used for testing a tricuspid valve and/or a pulmonary valve; the monitoring device comprises a pressure monitoring device, and the pressure monitoring device is used for detecting pressure changes before and after the interventional valve is released. The system provided by the invention has universality and a wide application range.

In a method and processor for evaluating a contrast agent-enhanced two-dimensional magnetic resonance slice image of a heart of a patient in order to determine picture elements revealing contrast agent deposits in the myocardium, an endocardium contour in the magnetic resonance slice image, taking into consideration deposition information describing picture elements potentially revealing contrast agent deposits and determined by image analysis on the basis of a shape assumption for the heart structure that is to be examined, in particular the left ventricle, such that picture elements potentially revealing contrast agent deposits are avoided as much as possible as a contour component. An epicardium contour enclosing the endocardium contour is then determined. Picture elements are marked that indicate contrast agent enhancement in the myocardium lying between the epicardium contour and the endocardium contour as contrast agent deposit.