5 results about "Cardiac impulses" patented technology

The invention belongs to the technical field of biomedical engineering and intelligent monitoring, and particularly relates to a UNet-BiLSTM detection method and system for the cardiac interval of a ballistocardiograph signal, and the method comprises the steps: collecting an original ballistocardiograph signal in a non-contact manner through a distributed sensor array; performing filtering, baseline correction and standardization processing on the original ballistocardiogram signal to generate a standardized signal segment; the standardized signal segment is input to a UNet-BiLSTM fusion model, a UNet module extracts spatial features and outputs a probability graph, a BiLSTM module captures bidirectional time sequence dependence and corrects the probability graph, and a J peak of the heart impact signal is positioned; and calculating a cardiac interval and a heart rate based on a J peak positioning result, and executing at least one operation of display, early warning and data transmission. According to the invention, the problem of insufficient BCG signal spectrum characteristic adaptation is solved.

This invention provides a method and system for sleep stage detection and intervention based on cardiac impulse signals, belonging to the field of sleep monitoring. The method includes: acquiring sleep cardiac impulse signals and separating them into multiple modal physiological signal sequences; extracting feature vectors from each sequence and calculating attention weights using modal correlation; weighted fusion to generate a multimodal fusion feature vector and determining the current sleep stage; outputting acoustic stimulation signals when in slow-wave sleep, and monitoring changes in cardiac impulse signals in real time during the output process, adjusting the stimulation if body movement exceeds limits or sleep becomes shallow. This application achieves dynamic weighted fusion of multimodal features through a self-attention mechanism, solving the problem of single signals being easily interfered with in non-contact monitoring, and significantly improving the accuracy of sleep staging; by sending adjustment commands when body movement intensity exceeds limits or sleep becomes shallow, the acoustic stimulation is adjusted, effectively avoiding false awakenings while enhancing slow-wave sleep, ensuring the safety and effectiveness of sleep intervention.

This invention discloses an electrocardiogram (ECG) synthesis method and system based on adaptive dual encoders and wavelet fusion. The method first calibrates the time offset between the cardiac impulse signal and the reference ECG through cross-correlation alignment; it then constructs an adaptive orthogonal wavelet decomposition module using learnable perturbation terms to separate multi-scale components; subsequently, it employs parallel feature extraction using dual encoders in the time and wavelet domains, and achieves dynamic fusion of heterogeneous features through a gated cross-attention mechanism; a bottleneck layer introduces bidirectional temporal convolution to enhance long-range dependency modeling and correct phase offset; in the decoding stage, multi-scale wavelet heuristic decomposition guides upsampling to reconstruct fine-grained morphology. This invention effectively solves the problems of weak individualized modeling capability and loss of high-frequency details in existing technologies, possessing advantages of high fidelity and low computational complexity, and is suitable for real-time health monitoring of edge devices.

The invention relates to the field of biology and basic medicine, in particular to animal experiments. The invention discloses a handheld rat and mouse cardiac impulse detector which is used for assisting in detecting rat and mouse cardiac impulse in the rat and mouse heart blood sampling process and accurately determining the blood sampling position by fixing the depth of a syringe penetrating into the heart. The instrument comprises a miniature cardiac pulse detector, a cardiac pulse signal and electric signal conversion module, an electronic display screen with a small hole in the middle, a handle, a switch and a USB interface. The instrument can detect heart beat signals of rats and mice in real time, convert the signals into electric signals and finally display the electric signals on the electronic display screen in a contour line form. An operator can determine the area with the strongest cardiac pulsation according to the depth of the color, the small hole in the instrument is moved to the area, and a syringe needle penetrates through the hole and pierces the heart of a rat or a mouse for blood collection. Compared with a traditional heart blood sampling method, under the assistance of the instrument, the consistency of blood sampling positions and the blood sampling success rate can be guaranteed, and follow-up experiment variables are reduced.

This application discloses a method, controller, sleep monitoring device, and storage medium for determining central sleep apnea. The method includes acquiring real-time cardiac impulse signals, acquiring a first array of data and a second array of data based on the cardiac impulse signals, determining an apnea threshold based on the first array of data, and comparing the second array of data with the apnea threshold. If the absolute values ​​of all values ​​in the second array of data are less than the apnea threshold, then central sleep apnea has occurred. This application adaptively determines an apnea threshold that matches the user's situation. The apnea threshold can comprehensively characterize the user's breathing status under normal breathing conditions in a fine-grained and personalized manner. Then, the second array of data is automatically compared with the apnea threshold to automatically determine whether the user has central sleep apnea, which helps to screen for related disease risks.