A study for the development of K-sound based automatic blood pressure device using PVDF film

Abstract

Traditional indirect standard measurement of blood pressure is based on hearing Korotkoff sounds to determine systolic and diastolic blood pressure. However, the problem exists among different types of automatic blood pressure monitoring devices because of no standard algorithm for estimating accurate blood pressure values. Aim of the study was to develop an automatic blood pressure measurement device based on Korotkoff sounds. PVDF(poliyvinylidene fluoride) film was used as a contact microphone to detect Korotkoff sounds on the brachial artery, and pressure sensor was used to obtain cuff pressure. With those two variables, an algorithm to determine systolic and diastolic blood pressure was established. Correlation coefficients between auscultatory method and developed device were 0.977 and 0.968 for systolic and diastolic, respectively. Validation results based on the international protocol shows 95% and 91.6% of accuracies.

Korotkoff sounds dynamically reflect changes in cardiac function based on deep learning methods

“…Our initial intention was not to reproduce the original K-sounds during blood pressure measurements, but only to acquire K-sound audio data from HF. The PVDF membrane technique by Xiong et al can minimize the loss of audio signals during the acquisition process (89). We modified the cuff of the electronic oscilloscope by adding PVDF membranes, but the actual effect is yet to be further tested.…”

“…Accurate BP measurements using CNN based on K-sounds have been able to exclude external interference, and map the corresponding systolic and diastolic BP in the time phases I and V. Therefore, we do not have to worry about the environment of the ward or the interference of external noise affecting the quality of K-sounds. Moreover, the PVDF membrane pressure sensors can be used while collecting K-sounds, which can reduce the loss of available signals (89). Celler et al optimized the collection of K-sounds (49).…”