ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

Electrosurgery is effective in the operating room, saving both time and surgical trauma to the patient. Many hospitals have demonstrated that it can be used without injury to either the patient or the staff. This article presents an introduction to the concepts used in electrosurgery and covers the theory of operation, applications, and safety considerations. A description of the surgical effects of desiccation, cutting and fulguration is presented.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

The Veterans Administration'sDepartment of Medicine and Surgeryincludes in itsGraduate Engineer Training Programa special program for Biomedical Engineers. The program is intended for recent graduates in biomedical engineering and provides for the VA a means of recruiting and training biomedical engineers for employment in its medical centers nationwide. This paper discusses the structure and objectives of the program, the opportunities that exist for the trainee within the program and the results of the program since its inception in 1973, and provides an outlook on the future of the program.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

This paper presents a design for a useful physiological simulator. Where budgets are limited for capital equipment purchases, but labor is available, it may be useful to construct this test device. The circuit designs may also be useful in the design and construction of other special or fixed-purpose, test instruments. The design presented here includes: an ECG waveform simulator with four parts; arterial and venous pressure signals; fetal pressure; and an impedance respiration signal.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

The field of transcutaneous monitoring is growing rapidly, both in acceptance of the techniques, and in the number of manufacturers. FDA regulations encompass all medical devices, and limit some devices to very specific uses and/or personnel. Clinical Engineers should become familiar with FDA regulations concerning medical devices in general and transcutaneous monitors in specific, in order to appropriately advise the hospital on the purchase of such equipment.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

The purpose of this study was to develop a prototype microprocessor program for detection of ventricular fibrillation. The program was designed for future adaptation to a portable microcomputer device. Ventricular fibrillation in 20 experimental animals and continuous surface ECG recordings from 16 patients were analyzed by an algorithm based on detection of R-wave magnitudes and R-R intervals. The algorithm was implemented by an 8080 based microcomputer with 4K memory.Ventricular fibrillation was accurately detected and premature ventricular contractions analyzed with a correlation coefficient of 0.96 between visual count and microcomputer determination. This study shows that microcomputer technology can be utilized to detect and analyze ventricular fibrillation and ventricular arrhythmias.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

Annular tetrapolar electrodes of different diameters were used to measure skin resistivity noninvasively. The effective measurement depth was proportional to the electrode diameter. The various electrodes were calibrated with saline solutions of known resistivity. Skin resistivities were measured on 15 human subjects and a two-layer model was constructed to simulate human skin. Skin resistivities measured with the smallest electrode (1.0 cm.) were very similar among the subjects. Resistivities measured with the largest electrode (5.0 cm.) had a wide range of values, with the higher values from subjects with more subcutaneous fat.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

An M-mode echocardiographic study was performed on 10 normal patients and 5 compensated pressure overload (CPO) patients. The end-systolic longitudinal area ratio, AR&phis;(ES), was defined as the wall cross-sectional area at end-systole divided by the wall cross-sectional area at enddiastole and taken as a measure of myocardial wall deformation. The average value of AR&phis;(ES) for the 10 normal patients (1.26 ± .24) was very similar to the average value of AR&phis;determined by cineangiography in a previous study (1.27 ± .14). For the first time, a CPO patient population has been analyzed for AR&phis;(ES) and was found to be 2.031 ± .439 which is definitely elevated over the normal population (p<.025). The study is significant since it shows that: (1) measurements required to calculate AR&phis;can be obtained non-invasively by echocardiography which makes AR&phis;(ES) available as a routine, screening measurement of patient populations as contrasted with cineangiography; and, (2) a large amount of myocardial wall deformation apparently occurs as part of the compensatory left ventricular process.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID

摘要:

A new device has been developed atThe University of Western Ontarioto simplify and improve the accuracy of compartment pressure measurements in limbs. The device consists of two components: a catheter assembly and a meter unit. The catheter assembly consists of a slit catheter connected via a pressure line to a plastic transducer dome and a Bell and Howell transducer. The meter unit contains the power supply and calibration adjustments, and combines a digital display reading with an audio and visual warning system. An experimental investigation was undertaken to assess the accuracy and drift of theslit catheter techniqueagainst thewick catheterand theneedle manometer technique.The slit catheter was the most accurate of the three methods in the 0 to 80 mmHg range. The standard deviation was ± 1.1 mmHg versus ± 3.2 mmHg for the wick and ± 4.0 mmHg for the needle manometer technique. In addition, the slit catheter showed less drift when measuring a constant pressure of 35 mmHg for six hours. Standard deviation over this time period was ± 1.9 mmHg for the slit catheter compared to ± 2.6 mmHg for the wick and ± 7.7 mmHg for the needle manometer.The slit catheter system described here is simple to use and is the most accurate method of measuring intracompartmental pressure up to 80 mmHg. It is easy to make and assemble and has less drift than the other methods investigated.

ISSN:0363-8855    

出版商:OVID    

年代:1981

数据来源: OVID