摘要:

A modular physical circuit for testing monoventricular and biventricular heart assist devices (HAD) is under development. The modules now available are assembled in an open-loop circuit and reproduce the function of the left ventricle and the systemic arterial tree. The left ventricle model reproduces Starling's law of. the heart and can be easily controlled to modify other parameters such as contractility and timing (i.e. heart rate and systole/diastole ratio). This circuit, in connection with a left ventricular assist device (LVAD), can be used to evaluate the LVAD performance, its effect on the circulatory system and as a training system. This paper is devoted to a description of the circuit and of its interaction with a LVAD, which is analysed after the simulation of a low contractility pathology of the ventricle. Results obtained in these experiments are reported.

ISSN:0309-1902    

DOI:10.3109/03091909409030237

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

In an important subset of surgical procedures, the procedure itself poses a significant threat to the patient's nervous system. In order to reduce this threat, neurophysiological function of the structures at risk may be monitored during surgery using time-locked sensory or motor-evoked responses. A simple but powerful extension of the segmented and sliding average techniques currently in wide use is described and demonstrated. By fitting polynomial functions of time to capture time variations in the evoked response, signal/noise enhancement comparable with that of averaging is obtained. More importantly, a considerable improvement in time resolution is gained. In the demonstration data set presented in the figures, clinically significant changes were identifiable in one-sixth of the time required using signal averaging.

ISSN:0309-1902    

DOI:10.3109/03091909409030238

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

This study describes a method of acquiring data from healthy and non-injured men that can be used as reference data when measuring the grip strength of the human hand using newly developed, PC-based hand strength analysis equipment -‘Hastras’. Hastras can be used for continuous measurement and recording of force when the subject grips a sensor with maximum power. Computerized analysis of the force signal gives information about maximum force, fatigue, area and rise (force/s). The statistical analysis of the measurements on 81 subjects are consistent with earlier published data from other hand strength equipment. It is concluded that Hastras gives easy processing and storage of data, and also a detailed analysis of grip function.

ISSN:0309-1902    

DOI:10.3109/03091909409030239

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030240

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

The Echo ManuaBy By J. K. Oh, J. B. Seward and A. J. Tajik. 1994, E65.00, pp. 252. Little, Brown and Co., Boston, ISBN 0 316 633747.

ISSN:0309-1902    

DOI:10.3109/03091909409030241

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030242

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030243

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030244

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030245

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor