45 results about "Systolic phase" patented technology

An annuloplasty ring to resize a dilated aortic root during valve sparing surgery includes a scalloped space frame having three trough sections connected to define three crest sections. The annuloplasty ring is mounted outside the aortic root, and extends in height between a base plane and a spaced apart commissure plane of the aortic root. At least two adjacent trough sections are coupled by an annulus-restraining member or tether that limits the maximum deflection of the base of the annuloplasty ring. In use, the tether is preferably located in proximity to the base plane of the aortic root. The annuloplasty ring is movable between a first, substantially conical configuration occurring during a diastolic phase of the cardiac cycle, and a second, substantially cylindrical configuration occurring during a systolic phase of the cardiac cycle. The attachment of the annuloplasty ring in proximity to the cardiac valve annulus allows the ring to regulate the dimensions of a dynamic aortic root during the different phases of the cardiac cycle.

A method and apparatus for optimizing cardiac resynchronization therapy are provided. An iterative optimization procedure is performed to test the systolic hemodynamic effects of varying A-V-V timing schemes. The hemodynamic effect is assessed based on a surrogate of stroke volume. The stroke volume surrogate is derived from a sensor signal proportional to the blood pressure in the aorta or a major artery. The A-V-V timing scheme corresponding to the greatest stroke volume, as indicated by the stroke volume surrogate, is identified and automatically programmed to maintain optimal A-V-V settings acutely and chronically.

A contactless system for measuring and continuously monitoring arterial blood pressure includes a light source configured to illuminate light having at least one predetermined wavelength at a predetermined area of a human subject having an artery therein. A detector responsive to reflected light from the predetermined area is configured to continuously acquire images of the artery in the predetermined area. A processor is configured to process the images and determine: when an image at a proximal location of the predetermined area is darker indicating transition of a pulse wave into the artery at the proximal location and at a proximal time and when an image at a distal location of the predetermined area is darker indicating transition of the pulse wave into the artery at a distal location at a distal time, determine the difference in time between the distal time and the proximal time to calculate a pulse transit time (PTT), determine a length between the proximal location and the distal location, determine a diameter of the artery during a systolic phase of a cardiac pulse, determine a diameter of the artery during a diastolic phase of a cardiac pulse, calculate a pulse wave velocity of the pulse wave, calculate pulse pressure (ΔP), calculate an elastic modulus (E) of the artery, and contactlessly and continuously calculate the arterial blood pressure for each cardiac cycle of the human subject.

A valve repair device for repairing a native heart valve of a patient includes a pair of clasps, where each clasp is configured to attach to native valve leaflet. The ends of the pair of clasps can move away from one another to a partially open position when the native valve leaflets open during a diastolic phase of a cardiac cycle, and the ends of the pair of clasps can move toward one another when the native valve leaflets close during a systolic phase of a cardiac cycle.

An apparatus for detecting vital functions has a pulse wave sensor attachable to a body and a control unit. The control unit checks if amplitude of pulse wave signals produced from the pulse wave sensor varies. The control unit further checks if a large change in the amplitude during a systolic phase of a pulse wave corresponding to the systolic phase of the heart. If a first large change in the amplitude during a diastolic phase of a pulse wave corresponding to the diastolic phase of the heart, it is highly probable that a motion artifact has occurred. Therefore, a motion artifact flag is set. Next, it is checked if the amplitude in the next diastole is changing by more than 30%. If it is presumed that the occurrence of cough is highly probable, a cough flag is set. If it is neither the motion artifact nor the cough, then a yawn flag is set.

A cardiac ventricular assist device or VAD includes a pumping unit with a variable-volume chamber capable of receiving a mass of blood, and a control unit to control the pumping unit to obtain contraction of the variable-volume chamber, with consequent expulsion of the blood collected in the chamber, and expansion of the variable-volume chamber consequent on the flow of blood into the chamber. A flow line is included, such as a transcutaneous line, for a gaseous flow caused by the contraction and expansion of the variable-volume chamber. A sensor sensitive to the gaseous flow in the flow line generates a flow-meter signal that is indicative of the expulsion and inflow of blood with regard to the variable-volume chamber. The control unit is sensitive to said flow-meter signal and utilises that signal to control the pumping unit, for example to cause the pumping unit to operate in a condition of synchronous counterpulsation with regard to the natural heart, that is with the variable-volume chamber capable of receiving blood from the assisted heart when it is in a systolic phase and the variable-volume chamber that expels the blood collected in the chamber, when the assisted heart is in a diastolic phase.

The present invention provides methods and direct cardiac contact device to improve the diastole phase and the systolic phase of a heart and includes a biocompatible film pneumatic locked to the heart to aid in heart compression and relaxation.

The systolic timings of myocardia at various positions of a heart are analyzed and evaluated. An image processing apparatus 1 obtains myocardial thicknesses at various positions of a heart within a plurality of three dimensional images V1 through VK, obtained by imaging a heart at a plurality of temporal phases within a single cardiac cycle, at each of the temporal phases. The image processing apparatus 1 obtains representative values that represent the systolic phase of the myocardia at each position, based on the obtained myocardial thicknesses at each temporal phase, and outputs the obtained representative values.

The invention relates to the technical field of image treatment, in particular to a determination method of cardiac cycles and ultrasonic equipment. The determination method comprises the steps that cardiac ultrasonic videos are obtained; the cardiac ultrasonic videos are classified by using a section-type recognition model to determine the section types of the cardiac ultrasonic videos; and the cardiac ultrasonic videos are processed by adopting systolic and diastolic period recognition models corresponding to the section types, and the cardiac cycles corresponding to the cardiac ultrasonic videos are obtained. Models are adopted to process the cardiac ultrasonic videos to detect the corresponding cardiac cycles. Through a mode of model detection, the use of an electrocardiograph can be avoided, and the detection of the cardiac cycles can be simplified; and furthermore, the real-time detection of the cardiac cycles in the process of cardiac ultrasound can be achieved.

Embodiments of the present invention provide an improved transformation method whereby the peripheral pulse waveform is filtered to separate different phases which make up the waveform. The separate phases are transformed before being re-combined to provide an estimated intra-arterial transfer function. For example, in one embodiment the peripheral pulse waveform is filtered by a first high pass filter, and a copy of the peripheral pulse waveform filtered by a second high pass filter, having a different cut-off frequency. The two filtered waveforms may then be further processed, for example by being added back to original wave-form, and are then multiplexed together in a time division manner to provide a final waveform. For example, the part of the first filtered waveform corresponding to the systolic phase may be combined with the part of the second filtered waveform corresponding to the diastolic phase to produce the final waveform, and the respective filter cut-off frequencies may be chosen to extract characteristics of the respective phases of the heart.

The invention discloses a high-flow pulsating electromagnetic blood pump, which comprises a mounting bracket. At least two magnetic pushing devices mounted on the support surface, the magnetic pushingdevices comprising a drive coil, a permanent magnet piston, a two-way joint, an inner bag and a magnetic shielding cylinder; At least one set of linkage assemblies for linkage of permanent magnet pistons in two of the magnetic propulsion devices of the same set reciprocating alternately; A processor for controlling a control circuit of the driving coil by a set rhythm or according to an electrocardiogram signal of a human body surface; And an electrocardiogram electrode for detecting and transmitting a body surface electrocardiogram signal of the human body to the processor. The invention integrates a plurality of magnetic pushing devices and is linked by the linkage components in two groups, thereby effectively reducing heat generation, increasing the power of the whole machine in multiple, simultaneously increasing the flow rate, and effectively improving the working condition. It can also be controlled according to extracorporeal electrocardiogram signals, which can avoid increasing the afterload of myocardium in systolic phase.

The invention relates to a method and a post-operative care unit for analysing and quantifying an ultrasound tissue Doppler imaging (TDI) signal from a transducer fastened on the myocardium to obtain a parameter indicating regional cardiac ischaemia or correlates with global hypokinetic heart function. This has the advantage over manually operated probes that it can be automated and used continuously over long time. According to the method, a TDI signal trace corresponding to at least one of tissue velocity, strain or strain rate is extracted and correlated with an electrocardiogram to define subsections within a cardiac cycle in the extracted trace corresponding to the early systolic phase and the post-systolic phase. Then, a velocity, strain or strain rate is read in at least the post-systolic phase of the extracted trace, and a parameter which is a function of one of these readings and which indicates ischaemia or global hypokinetic function is generated.

The invention discloses a coronary artery stenosis visualization quantification method and device based on multi-channel heart sound, and is suitable for the field of analysis of cardiophonogram electrocardiograms. The method comprises the steps of synchronously collecting and recording electrocardiosignals and multi-channel heart sound signals, and storing the electrocardiosignals and the multi-channel heart sound signals as audio files; segmenting heartbeat cycle signal data into S1, a systolic period, S2 and a diastolic period by using R waves and heart sound characteristics; respectively calculating characteristic values of each section of the heartbeat cycle and the total heartbeat cycle; performing stenosis degree risk prediction by adopting multi-model prediction and decision rules;and representing the coronary artery stenosis risk degree by adopting columnar graphs with different colors and heights. According to the method, various characteristics are extracted, heartbeat cycle characteristics are reflected in all directions, and the model prediction accuracy is improved through the multi-machine learning model and the use of decision rules. The health condition of the coronary artery is visually reflected in the forms of the energy spectrogram and the histogram.

The invention relates to a heart image acquisition method and device, magnetic resonance equipment and a storage medium. The method comprises the following steps: acquiring a preset excitation space of a target scanning layer of a heart area, determining a target radio frequency pulse according to parameters of the preset excitation space and a preset gradient, exciting the preset excitation space by using the target radio frequency pulse, sampling the excited excitation space, filling a two-dimensional k space with sampling points, and obtaining a target scanning layer of the heart area; according to the method, the two-dimensional k space is subjected to image reconstruction to obtain the magnetic resonance heart image, the size of the original view space is reduced, it is ensured that the image in the systolic period can be scanned, and the two-dimensional k space is selected, so that motion artifacts generated during systole when a traditional three-dimensional k space is excited for scanning can be avoided.