Reviewing the theory of chaos in the field of nonlinear dynamics, this paper summarized theory of chaos and its applications in medical signal processing including electroencephalogram(EEG) signal?electrocardiogram(ECG) signal?electromyogram(EMG) signal, etc. The foreground is reviewed to advance the study and application of nonlinear dynamics theory in biomedical engineering.

Telemedicine is a combination of modern computer technology, communication technology and medical technology. It has a promising application potential. This paper mainly overviews the history of telemedicine, especially the development of wireless telemedicine. With the classification and comparison, the opinion on the future of wireless telemedicine is given according to the author's research work. Portable telemedicine system is the trend of telemedicine.

Objective Aimed at the problems that the costs of existing ECG data compression methods is high,and they are difficult to apply in engineering practice,a sort BP neural network is set up based on ECG data compression method.Methods Based on BP network theory,two three-layered feedforward neural networks were set up.Then every one heartbeat was divided into three waves,that is,P,QRS and T ones,and the three waves were compressed by two three-layered feedforward neural network individually.In order to improve the replay capability and interference rejection capability of the neural network compress algorithm,incompletely connected structure is employed.Results The method could realize high compress ratio,and improve the replay capability and interference rejection capability of the heartbeat waves.Conclusion Upon with the heartbeat signals,the method can filter and compress waves effectively,and can be used in engineering practice as well.

Visualization of medical images has become an important method for the basic medical research as well as clinical diagnosis and treatment.Construction of the highly sophisticated three-dimensional(3D) models of the human body by computers has become an essential foundation for current medical research and disease treatment methods.Visualization Toolkit(VTK) is a kind of famous software in scientific visualization fields.It is convenient and efficient for programming.This paper implements three typical algorithms,Contour-connecting,Marching Cubes and Ray-casting,of medical image 3D visualization using VTK with VC++.Results show that VTK is a powerful tool with many advantages,such as simple operation,fast,and good interaction ability and can be widely used in 3D reconstruction of medical images.

Being expert,sensitive and quick-responding,biosensor is widely applied in medicine domain.Theis paper briefly introduces the structure and characteristics of biosensors,analyzes the framework and principle of some types of biosensors and their applications in the biomedicine engineering,and discusses the recent research evolvement,development trend and application prospects.

Calculation of cardiac hemodynamic parameters is based on accurate detection of feature points in impedance cardiogram. According to these parameters, doctors can determine heart conditions, so it is very important to accurately detect the feature point of impedance differential signals. This article presents a process in which we used wavelet threshold method to de-noise signals, and then detected the feature points after six layers wavelet decomposition by using bior3. 7. The experimental data were collected from healthy persons in our laboratory and twenty two clinical patients in Chongqing Daping Hospital by using KF_ICG instrument. The results indicated that this method could precisely detect feature points whether it was from healthy people or clinical patients. This helps to achieve the application of noninvasive detection cardiac hemodynamic parameters in clinical treatments by using impedance method.
Cardiography, Impedance ; Electric Impedance ; Heart ; physiology ; Hemodynamics ; Humans ; Wavelet Analysis

The red cell deformability (RCD) has been taken as a diagnostic aid in recent years. The dilute red cell suspension passes through the silicon microch annels under constant suction pressure. Such three parameters of RCD are measure d as IF (filtration index), and The results show that the above-mentioned parameters can reflect the changes of cell rheological characteristics from dif ferent aspects. With the observation of the flow passage, the rehological charac teristics can be evaluated accurately and comprehensively.

Piezoelectric sensor is a kind of chemosensor,which utilizes the changes of quality to measure data.It is widely applied to the measurement of temperature,quality,intensity of strength and acceleration.Now it is also widely applied in the biomedical area.This paper is mainly about the fundamental principle,structure and the applications of the piezoelectric sensor.

It is necessary to build a three-dimensional human body model to display the position and track the route of a micro device inside the human body exactly. The key is to construct a three-dimensional human body model according to the patient characteristic. This paper gives a simple way to build the personal geometric model based on the OpenGL programming in the Visual Basic environment. It is proved that the method contributes to the realtime interactive operation to change the model character according to the individual parameter.

This paper introduces a kind of pocket blood pressure holter based on handhold personal computer. The measurement of blood pressure is controlled by ultralow power consumption MCU. The system configures interface circuit with handhold personal computer. The BP data can be stored, displayed, analysed and transmitted by handhold personal computer. The measurement parameters can be modified. The hardware is made up of three units: simulation circuit unit, intelligent control unit and interface circuit unit. Every unit structure and its principle are presented. The software of obtaining the BP data and communication with handhold personal computer are also illuminated. The system possesses the characters of portability, intelligence, convenience, high precision, ultralow power consumption and stable capability. It is possible to become an ideal blood pressure monitor in family.
Blood Pressure Monitoring, Ambulatory ; instrumentation ; Equipment Design ; Microcomputers ; Software Design