104 results about "Fetal heart sounds" patented technology

The invention relates to the technical field of medical monitoring, and discloses an instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis. The detection method comprises the following steps: preprocessing the Doppler fetal heart sound through a band-pass filter; performing time-sequence analysis on the preprocessed ultrasonic Doppler fetal heart sound, and acquiring a time-sequence graph of the ultrasonic Doppler fetal heart sound by adopting an STFT (Short Time Fourier Transform) to realize convenient and rapid calculation; acquiring the instant heart rate of the fetal heart sound with a cross-correlation method: selecting a feature frequency band according to the time-frequency graph of Doppler fetal heart sound, selecting a feature template according to prior knowledge of a fetal sound signal, evaluating a cross-correlation function of the feature frequency band and the feature template, drawing a cross-correlation curve, and calculating the instant heart rate of the ultrasonic Doppler fetal heart sound signal by calculating the interval of the crest value of the cross-correlation curve. The method can be applied to calculation of the instant heart rate of a clinically-acquired ultrasonic Doppler fetal heart sound signal, and has the advantages of easiness, high calculation speed and high accuracy.

The invention provides a fetal heart sound signal detection and processing device. The fetal heart sound signal detection and processing device comprises a signal detection unit and a signal processing unit. The signal detection unit is used for collecting fetal heart sound acoustic signals and converting the fetal heart sound acoustic signals into fetal heart sound electric signals. The signal processing unit comprises a processing subunit, a feature identification subunit and a calculation subunit. The processing subunit is used for carrying out denoising processing on the fetal heart sound electric signals and extracting signal envelopes of the fetal heart sound electric signals undergoing denoising processing. The feature identification subunit is used for identifying positions of first heart sound waveforms and positions of second heart sound waveforms in the signal envelops. The calculation subunit is used for calculating duration between starting points or finishing points of every two adjacent first heart sound waveforms and of every two adjacent second heart sound waveforms, so that multiple heart rate values based on first heart sounds and multiple heart rate values based on second heart sounds are obtained, and the heart rate values are averaged so that the fetal heart rate can be obtained. According to the fetal heart sound signal detection and processing device, fetuses cannot be influenced when fetal heart sound signals are collected, and the collected fetal heart sound signals can be well processed.

The invention relates to a domestic and medical two-purpose sound recording and fetal heart sound listening stethoscope, and belongs to the field of medical apparatuses. A stethoscope head (1), a sound conduction tube, a three-way tube and a listening tube protecting port are mutually connected, so that a pipeline stethoscope is constituted; a microphone, an amplifier (2), a recording-playing module (3), a transmission module (4), a power supply and the like are arranged in the stethoscope head, so that an electronic stethoscope, which is capable of recording and playing sound, is formed to listen two different stethoscopic sound effects. People can identify sounds from left side and right side through two ears, but the known stethoscopes are operated in a mode of communicating left and right ears, and subsequently, a listening habit is changed and a hearing threshold is narrowed; with the application of the stethoscope which adopts a novel dual-sound-track circuit, the listening habit is recovered and the hearing threshold is widened, so as to bring about benefits for doctors in auscultation. In addition, known fetal heart rate instruments cannot output original heartbeat sound, while by virtue of the novel stethoscope, actual fetal heartbeat sound can be listened, and meanwhile, the sound can be recorded or played; and when the sound is recorded, a voice catalog can be additionally annotated by virtue of the microphone, so that functions of searching and tracing an electronic medical record can be developed. Moreover, a carotid artery plaque detection method is more convenient and rapider than the known stethoscopes.