The teaching of experiment about how to guide medical students to design and make auscultative system is given.By designing and making auscultative system,the student can not only understand computer system and its interface,including amplifier circuit,filter circuit,A/D and D/A circuit,but also train their ability to use hand and the knowledge learned,thus arousing their innovation and creativity.

Objective: To investigate effect of Zhuanggu Granula medicated serum on proliferation and differentiation of bone marrow stromal cells(BMSCs) in vitro. Methods: Isolated BMSCs were cultured in vitro. The cells were treated with Zhuanggu Granula medicated serum, and the blank serum as the control group. The proliferation of cells was detected by MTT assay, the macroscopic histology, HE staining and immunohistoc-hemical examinations. Results: Zhuanggu Granula medicated serum effectively stimulated BMSCs proliferation (P

Counting-type analog quantity (CAQ), a new conception, is introduced in this article. CAQ possesses some features of analog quantity and digital quantity, that is to say, it has double features. By analysis, two kinds of CAQ are found: one is width-modulated countable pulse series, the other is frequency-modulated countable pulse series. Furthermore, the method of generating CAQ is described and its double feature is also proved. It is very convenient to realize single-channel or multi-channel analog-to-digital (A/D) conversion by using CAQ without utilizing present integrated A/D conversion chip. In this paper, for proving its feasibility, multi-channel telemetering computer system for dynamic information about human vascular wall,a typical example of using CAQ in medicine, is expatiated. The typical example clearly indicates: not only the method for application of CAQ is simple and viable, but also the application of CAQ is very wide.
Analog-Digital Conversion ; Blood Vessels ; physiology ; Computer-Aided Design ; Elasticity ; Electronics, Medical ; instrumentation ; Humans ; Monitoring, Physiologic ; instrumentation ; Signal Processing, Computer-Assisted

An opened instrument with liquid crystal display (LCD) for generating and measuring physiological signal is introduced in this paper. Based on a single-chip microcomputer. the instrument uses the technique of LCD screen to display signal wave and information, and it realizes man-machine interaction by keyboard. This instrument can produce not only defined signal in common use by utilizing important saved data and relevant arithmetic, but also user-defined signal. Therefore, it is open to produce signal. In addition, this instrument has strong extension because of its modularized design as computer, which has much function such as displaying, measuring and saving physiological signal, and many features such as low power consumption, small volume, low cost and portability. Hence this instrument is convenient for experiment teaching, clinic examining, maintaining of medical instrument.
Analog-Digital Conversion ; Equipment Design ; Humans ; Microcomputers ; Monitoring, Physiologic ; instrumentation ; Signal Processing, Computer-Assisted ; instrumentation ; Software

Based on theoretic analysis, a new method for measuring linearity of physiological instrument and its inner unit circuits is provided. In this method, the sawtooth wave signal, which includes a base wave and its odd-even times harmonic waves, is used to act as input signal, then the linearity of physiological instrument and its inner unit circuits can be measured by analyzing the shape and frequency property of the output signal. The results of experiment show this method is quick and convenient for measuring the linearity of physiological instrument and its inner unit circuits.
Diagnosis, Computer-Assisted ; methods ; Humans ; Monitoring, Physiologic ; instrumentation ; Signal Processing, Computer-Assisted