Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2007 Nov 11;7(12):3192-3208.
doi: 10.3390/s7123192.

Design Considerations for Aural Vital Signs Using PZT Piezoelectric Ceramics Sensor Based on the Computerization Method

Suranan Noimanee  1 , Tawee Tunkasiri  2 , Kingkeo Siriwitayakorn  2 , Jerapong Tantrakoon  2
Affiliations

Design Considerations for Aural Vital Signs Using PZT Piezoelectric Ceramics Sensor Based on the Computerization Method

Suranan Noimanee et al. Sensors (Basel). .

Abstract

The purpose was to illustrate how system developed for measurement of the aural vital signs such as patient's heart and lung sounds in the hospital. For heart sounds measurement must operate the frequency response between 20 - 800 Hz, and lung sounds measurement must operate the frequency response between 160 - 4,000 Hz. The method was designed PZT piezoelectric ceramics for both frequency response in the same PZT sensor. It converts a signal from aural vital sign form to voltage signal. The signal is suitably amplified and re-filtered in band pass frequency band. It is converted to digital signal by an analog to digital conversion circuitry developed for the purpose. The results were that all signals can fed to personal computer through the sound card port. With the supporting software for drawing of graphic on the screen, the signal for a specific duration is accessed and stored in the computer's memory in term of each patient's data. In conclusion, the data of each patient call dot pcg (.pcg) for drawing graph and dot wave (.wave) for sound listening or automatic sending via electronic mail to the physician for later analysis of interpreting the sounds on the basis of their time domain and frequency domain representation to diagnose heart disorders.

Keywords: PZT piezoelectric ceramics sensor; aural vital signs; dot pcg; dot wave; heart and lung sounds; interpreting the sounds.

PubMed Disclaimer

Figures

Figure 1.
Figure 1.
PZT Piezoelectric ceramics transducer.
Figure 2.
Figure 2.
PZT Piezoelectric ceramics compared with Thai baht cone.
Figure 3.
Figure 3.
Equivalent circuit for piezoelectric ceramic.
Figure 4.
Figure 4.
Capacitive transducer.
Figure 5.
Figure 5.
Pulse response of piezoelectric ceramic.
Figure 6.
Figure 6.
The exercise test before measuring heart and lung sounds.
Figure 7.
Figure 7.
Normal and innocent murmur (t = 1.528s).
Figure 8.
Figure 8.
5 signatures for each of the 4 classes of lung sounds in normalized amplitude vs time in mS.
Figure 9.
Figure 9.
Comparison between ECG and PCG timing.
Figure 10.
Figure 10.
Block diagram of the system.
Figure 11.
Figure 11.
Frequency response of PZT.
Figure 12.
Figure 12.
PZT piezoelectric ceramics with 4.0 m.m. diameter.
Figure 13.
Figure 13.
PZT is inserted in stethoscope.
Figure 14.
Figure 14.
Prototype of aural vital signs system.
Figure 15.
Figure 15.
The heart and lung sounds output display.
Figure 16.
Figure 16.
The transit time analysis of heart and lung sounds.
See this image and copyright information in PMC

References

    1. Saito N. PhD thesis. Yale University; 1994. Local Feature Extraction and Its Applications Using a Library of Bases.
    1. Shino H., Yoshida H., Yana K., Harada K., Suto J., Harasawa E. Detection and classification of systolic murmur for phonocardiogram. Proc. 18th Ann.Int. ConJ IEEE EMBS; 1996. paper 1.3.1-4 on CD-ROM.
    1. Khadra L., Matalgah M., el Asir B., Mawagdeh S. The wavelet transform and its applications to phonocardiogram signal analyzing. Medical Informatics. 1991;16:271–277. - PubMed
    1. Obaidat M.S. Phonocardiogram signal analysis: techniques and performance comparison. J. Med. Eng. Technol. 1993;17:221–227. - PubMed
    1. Rumellhart D.E., McClelland J.L. Purullel Distributed Processing. Vo l.l. The MIT Press; 1986.

LinkOut - more resources