摘要:

We present details of the modelling, design, and experimental testing of an implantable system with a monopolar half-cuff electrode for selective stimulation of fibres within certain superficial regions of the human common peroneal nerve which is capable of making a selective activation of muscles, thus contributing to strong dorsal flexion and moderate eversion of the hemiplegic foot. The development of the cuff electrode was based partly on data obtained from histological examination of human common peroneal nerves, and from previously described models of excitation of myelinated nerve fibres. The modelling objectives were to determine the electric field that would be generated within the deep peroneal branch of the nerve by a monopolar half-cuff electrode installed on the nerve behind the lateral head of the fibula. The extent of initial excitation of the nerve fibres within the superficial region of the deep peroneal branch elicited by a monopolar half-cuff electrode was predicted. In the past 6 months two systems were implanted. In both patients significant improvements of gait dynamics were observed.

ISSN:0309-1902    

DOI:10.3109/03091909409030228

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

To meet the needs of our research programmes on auditory prostheses for the totally deaf, a 15-channel data acquisition and waveform generator system with flexible triggering, pacing and linking was developed. It allows both synchronous and asynchronous operation at high speed. Each channel of the system, which is controlled by a simple personal computer, has an on-board microcontroller, a 512 kWord signal memory, a voltage input and both voltage and current outputs. The system includes a master pacer and trigger unit with elaborate hardware and software triggering options. This paper describes the system hardware and the software used to control it. Finally, some of Us applications are demonstrated. The flexibility of the system makes it widely applicable in the field of biomedical engineering.

ISSN:0309-1902    

DOI:10.3109/03091909409030229

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Operative management of long bone fractures is considered to be the treatment of choice all over the world. This could be achieved either by intramedullary nailing or plating. The former allows delivery of stresses into the fracture site, but it requires a well-equipped operating theatre and an experienced surgeon who is, unfortunately, continuously exposed to radiation. On the other hand, plates could easily be applied in every orthopaedic clinic, but the existing ones are rigid and protect the fracture site from stresses to which it is ordinarily exposed. Recently, various experimental attempts have been made to provide plates which allow partial loading on the fracture site and enhance callus formation (secondary fracture healing). Bearing that in mind, a two-part sliding plate (SP) has been developed at the Orthopaedic Clinic of Patras University, which allows intermittent loading into the fracture site. Both the conventional A 0 rigid plate and SP were applied to osteotomized sheep radii. The dynamic properties of the callus were estimated with its two dynamic mechanical characteristics (dynamic modulus of elasticity and the relative loss factor), whereas its static properties (strength) were evaluated by measuring the ultimate bending strength. A superiority of callus produced by the sliding plate was observed concerning all the parameters under consideration.

ISSN:0309-1902    

DOI:10.3109/03091909409030230

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030231

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030232

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030233

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Hospital Department Profiles, 3rd Edn. By A. J. Goldberg and R. A. Buttaro. 1990, US$45.95, pp. 265. American Hospital Publishing, ISBN 1 55648 0431.Blood-Compatible Materials and Devices (Perspectives Towards the 21st Century)Edited By C. P. Sharma and W. Szycher. 1991, US$85.00, pp. 303. Technomic, Lancaster, USA, ISBN 87762 733 9.Risk Management Handbook for Health Care FacilitiesEdited by L. M. Harpster and M. S. Veach. 1992, US$659.95, pp. 460. American Hospital Publishing, ISBN 1 55648 054 7.Principles of Medical ImagingBy K. K. Shung, M. B. Smith and B. Tsui. 1992, US$74.95. Academic, ISBN 0 12 640970 6.Medical Instrumentation: Application and Design, 2nd EdnEdited by John G. Webster. 1992,£39.50, pp. 814. Houghton Mifflin, Boston, MA, ISBN 0 395 59492 8.Electrical Trauma-The Patho- physiology Manifestations and Clinical ManagementBy R. C. Lee, E. G. Cravalho and J. F. Burke. 1992,£65.00, Cambridge University Press, ISBN 0 521 38345 5.Laser Non-Surgical Medicine: New Challenges for an Old ApplicationEdited by L. Goldman. 1993, SFr 187, pp. 334. Technomic, Basel, Switzerland. ISBN 87762 792 4.

ISSN:0309-1902    

DOI:10.3109/03091909409030234

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030235

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091909409030236

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor