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Comment on: Qualitative holographic study of hemi-pelvic deformation caused by loading different hip prostheses 点评:装载不同髋关节假体引起的半骨盆变形的定性全息研究
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90069-B
Patricio A.A. Laura PhD
{"title":"Comment on: Qualitative holographic study of hemi-pelvic deformation caused by loading different hip prostheses","authors":"Patricio A.A. Laura PhD","doi":"10.1016/0141-5425(93)90069-B","DOIUrl":"10.1016/0141-5425(93)90069-B","url":null,"abstract":"","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Page 522"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90069-B","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19116015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The rancho EMG analyzer: a computerized system for gait analysis 兰彻肌电分析仪:一种用于步态分析的计算机系统
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90064-6
J. Perry, E.L. Bontrager, R.A. Bogey, J.K. Gronley, L.A. Barnes
{"title":"The rancho EMG analyzer: a computerized system for gait analysis","authors":"J. Perry,&nbsp;E.L. Bontrager,&nbsp;R.A. Bogey,&nbsp;J.K. Gronley,&nbsp;L.A. Barnes","doi":"10.1016/0141-5425(93)90064-6","DOIUrl":"10.1016/0141-5425(93)90064-6","url":null,"abstract":"<div><p>This paper describes a computer system which accurately defines the EMG patterns of the lower extremities during gait. Footswitches are used to identify the temporal relationships and determine the phases of the gait cycle. Fine wire electrodes, inserted in the desired muscles of the patient being tested, provide EMG signals for comparison with a normal database. The system is also usable with surface electrodes when an appropriate normal database for surface electrodes is incorporated. Descriptive qualifiers (such as ‘premature onset’, ‘delayed cessation’, ‘no clinically significant EMG’, ‘continuous activity’ etc.) are used to produce a clinically relevant printed (textual) report. The intensity filtered average (IFA) of the EMG is shown graphically with the representative profile of each stride. The IFAs for all muscles tested can be plotted together (up to six on a page) and the graphic representation of the ‘raw’ EMG can be produced. The methods of generating the normal database by creating time-adjusted mean profiles (TAMP) are enumerated. The clinical use of the system is discussed. A detailed analysis of 31 of the most recent patient tests for which the system was used provides an indication of its accuracy. For 86% of the 428 muscle tests examined, the EMG analyser was considered to have given the correct result as compared with a visual analysis of the raw EMG record by a trained expert. Recommendations for the use and future improvements of the EMG analyser are made.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Pages 487-496"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90064-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19265104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 35
Acoustical detection of coronary occlusions using neural networks 基于神经网络的冠状动脉闭塞声学检测
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90060-C
M. Akay, W. Welkowitz
{"title":"Acoustical detection of coronary occlusions using neural networks","authors":"M. Akay,&nbsp;W. Welkowitz","doi":"10.1016/0141-5425(93)90060-C","DOIUrl":"10.1016/0141-5425(93)90060-C","url":null,"abstract":"<div><p>A nonlinear neural network classifier was applied to noninvasive acoustic detection of coronary artery disease; the classifier included a feature vector, derived from diastolic heart sounds, and a multi-layered network trained by the backpropagation. The feature vector is based on the linear prediction coefficients of the autoregressive method after an adaptive line enhancement method was used as the input pattern to the neural network. One hundred and twelve recordings (70 abnormal, 42 normal) were studied and the network was trained on a randomly chosen set of six abnormal and six normal patients. It was tested on a database consisting of 100 recordings to which it had not been exposed. The network correctly identified 50 of the 64 patients with coronary artery disease and 32 of the 36 patients without any coronary artery occlusions. These results showed that this neural network is capable of distinguishing normal patients from abnormal patients. In addition, the diagnostic capability of this approach is much better than any other available noninvasive approach.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Pages 469-473"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90060-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19265100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Validation of an automated method of three-dimensional finite element modelling of bone 骨三维有限元建模自动化方法的验证
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90066-8
J.H. Keyak , M.G. Fourkas , J.M. Meagher , H.B. Skinner
{"title":"Validation of an automated method of three-dimensional finite element modelling of bone","authors":"J.H. Keyak ,&nbsp;M.G. Fourkas ,&nbsp;J.M. Meagher ,&nbsp;H.B. Skinner","doi":"10.1016/0141-5425(93)90066-8","DOIUrl":"10.1016/0141-5425(93)90066-8","url":null,"abstract":"<div><p>This study validated an automated method of finite element modelling of bone from CT scan data. After a fresh-frozen cadaveric femur was modelled, strain gauges were attached to the bone at 11 locations and the femur was mechanically tested by applying a load to the femoral head. Linear regression analysis was used to correlate the strains predicted by the model with the experimentally measured strains. The regression results were significant (<em>P</em> &lt; 0.001), indicating that the strain calculated by the FE model is a valid predictor of the measured strain. Verification of the surface strains also supports the validity of the strains and stresses predicted inside the bone. The present study provides a strong rationale for use of this modelling method as a research tool and in possible clinical applications.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Pages 505-509"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90066-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19265106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 195
Preparation and in vivo evaluation of a newly developed bioglass ceramic 新型生物玻璃陶瓷的制备及体内评价
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90063-5
Feng-Huei Lin , Haw-Chang Liu , Ming-Hsiung Hon , Cheng-Yi Wang
{"title":"Preparation and in vivo evaluation of a newly developed bioglass ceramic","authors":"Feng-Huei Lin ,&nbsp;Haw-Chang Liu ,&nbsp;Ming-Hsiung Hon ,&nbsp;Cheng-Yi Wang","doi":"10.1016/0141-5425(93)90063-5","DOIUrl":"10.1016/0141-5425(93)90063-5","url":null,"abstract":"<div><p>This paper presents details of the fabrication of a glass ceramic, and its application as an artificial bone prosthetic material. This new bioglass ceramic, with composition of Na<sub>2</sub>O 8.4%, CaO 40.6%, P<sub>2</sub>O<sub>5</sub> 12% and SiO<sub>2</sub> 39%, had 160–190 MPa and 800–980 MPa of three-point bending strength and compressive strength respectively. The ceramic has a (Na, Ca) (P, Si) O<sub>3</sub> crystalline phase with a uniform crystal size of about 10μm, which was attributed to the high nucleation frequency. The rabbit condyle test showed that the material formed a tight chemical bond with biological texture and had good biocompatibility.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Pages 481-486"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90063-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19265103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Comparative study of the function of the Abiomed polyurethane heart valve for use in left ventricular assist devices 用于左室辅助装置的Abiomed聚氨酯心脏瓣膜功能的比较研究
Journal of biomedical engineering Pub Date : 1993-11-01 DOI: 10.1016/0141-5425(93)90068-A
M.E. Leat, J. Fisher
{"title":"Comparative study of the function of the Abiomed polyurethane heart valve for use in left ventricular assist devices","authors":"M.E. Leat,&nbsp;J. Fisher","doi":"10.1016/0141-5425(93)90068-A","DOIUrl":"10.1016/0141-5425(93)90068-A","url":null,"abstract":"<div><p>Hydrodynamic testing of the Abiomed polyurethane trileaflet valve has been carried out to establish performance data of valve function. A Medtronic Hall tilting disk, a Carbomedics bileaflet, a Hancock II bioprosthesis and an Abiomed polyurethane trileaflet valve, all size 27 mm, underwent both pulsatile and steady-flow hydrodynamic testing. Results of the variation of pressure difference with RMS pulsatile flow and steady flow, and effective orifice area, showed that the Abiomed valve had significantly poorer opening characteristics than the tissue valve and the two mechanicalvalves. The Abiomed valve's performance was seen to be related to its construction and manufacture. This study highlights some of the problems associated with the design and development of synthetic trileaflet heart valve prostheses.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 6","pages":"Pages 516-520"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90068-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19265809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 24
Analysis of all possible combinations of four measurements determining true propagation in arteries 四种测量方法的所有可能组合的分析，确定动脉的真正传播
Journal of biomedical engineering Pub Date : 1993-09-01 DOI: 10.1016/0141-5425(93)90074-9
J. She , C.D. Bertram , B.S. Gow
{"title":"Analysis of all possible combinations of four measurements determining true propagation in arteries","authors":"J. She ,&nbsp;C.D. Bertram ,&nbsp;B.S. Gow","doi":"10.1016/0141-5425(93)90074-9","DOIUrl":"10.1016/0141-5425(93)90074-9","url":null,"abstract":"<div><p>All possible combinations of four measurements of blood pressure, blood flow and vascular diameter are examined by transmission-line theory. It is found that only nine measurement combinations can give the attenuation coefficient γ, reflection coefficient <em>R</em> and characteristic impedance <em>Z</em><sub>0</sub> simultaneously. At least one pressure measurement must be included. Their general expressions with arbitrary measuring locations are presented, together with some simplified forms which cover all the previous methods. A greater choice of method is thereby made available for use in practice. The results show that, regardless of the measurement locations, all combinations can be solved in the order γ first, <em>R</em> second and <em>Z</em><sub>0</sub> last.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 5","pages":"Pages 379-386"},"PeriodicalIF":0.0,"publicationDate":"1993-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90074-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19219706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A new instrument for the measurement of forces on beds and seats 一种测量床和座椅受力的新仪器
Journal of biomedical engineering Pub Date : 1993-09-01 DOI: 10.1016/0141-5425(93)90078-D
R.H.M. Goossens , C.J. Snijders , G.A. Hoek van Dijke , A.H. den Ouden
{"title":"A new instrument for the measurement of forces on beds and seats","authors":"R.H.M. Goossens ,&nbsp;C.J. Snijders ,&nbsp;G.A. Hoek van Dijke ,&nbsp;A.H. den Ouden","doi":"10.1016/0141-5425(93)90078-D","DOIUrl":"10.1016/0141-5425(93)90078-D","url":null,"abstract":"<div><p>Knowledge of the interaction of forces between persons and the bed in which they lie or the seat on which they are sitting, provides an insight into the loading of their muscles, bones and soft tissue. To determine the total forces on the body-supporting surfaces (backrest, seat pan, foot rest) resolved in components perpendicular and parallel to these surfaces a new instrument has been developed, with which the forces perpendicular and parallel to three different freely adjustable body-supporting surfaces can be registered. During the first measurements the forces on a bed were measured when a person sits in a bed with the backrest at an angle of 45° to the horizontal and the mattress horizontal. The measurements on a healthy population (mean mass = 77 kg, <span>sd</span> = 11 kg) showed an accuracy of ± 10 N. In this position the mean shear force on the seat pan was 97 N.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 5","pages":"Pages 409-412"},"PeriodicalIF":0.0,"publicationDate":"1993-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90078-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19220293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Viscoelastic properties of the human lumbodorsal fascia 人体腰背筋膜的粘弹性
Journal of biomedical engineering Pub Date : 1993-09-01 DOI: 10.1016/0141-5425(93)90081-9
L.H. Yahia, P. Pigeon, E.A. DesRosiers
{"title":"Viscoelastic properties of the human lumbodorsal fascia","authors":"L.H. Yahia,&nbsp;P. Pigeon,&nbsp;E.A. DesRosiers","doi":"10.1016/0141-5425(93)90081-9","DOIUrl":"10.1016/0141-5425(93)90081-9","url":null,"abstract":"<div><p>The purpose of this study is to provide better understanding of the mechanical response of the lumbodorsal fascia to dynamic and static traction loadings. Since the fascia shows a viscoelastic behaviour, tests in which time is a variable were used, namely hysteresis and stress relaxation. Load-strain and load-time curves obtained from the hysteresis and stress-relaxation tests point out three different phenomena. First, an increase in stiffness is noticed when ligaments are successively stretched, i.e. strains produced by successive and identical loads decrease. Second, if a sufficient resting period is allowed between loadings, stiffening is reversed and strains tend to recover initial values. The third phenomenon, observed in stress-relaxation tests as time progresses, is ligament contraction in stretched and isometrically held samples. This third phenomenon may be explained by the possibility that muscle fibres capable of contracting spontaneously could be present in lumbodorsal fascia ligaments.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 5","pages":"Pages 425-429"},"PeriodicalIF":0.0,"publicationDate":"1993-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90081-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19220296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 117
Seven-channel digital telemetry system for monitoring and direct computer capturing of biological data 用于监测和直接计算机捕获生物数据的七通道数字遥测系统
Journal of biomedical engineering Pub Date : 1993-09-01 DOI: 10.1016/0141-5425(93)90083-B
A.M. Drewes , A. Andreasen , J.E. Assentoft , O. Nagel
{"title":"Seven-channel digital telemetry system for monitoring and direct computer capturing of biological data","authors":"A.M. Drewes ,&nbsp;A. Andreasen ,&nbsp;J.E. Assentoft ,&nbsp;O. Nagel","doi":"10.1016/0141-5425(93)90083-B","DOIUrl":"10.1016/0141-5425(93)90083-B","url":null,"abstract":"<div><p>A seven-channel telemetry system for collection and display of biological data is presented. The system can amplify bioelectrical signals in the range of 2 μV to 200 mV and has a bandwidth of 0.1–80 Hz. After multiplexing, the signals are digitized with a resolution of 8 bits. The data are frequency modulated directly on a VHF transmitter. After receiving the data on a VHF receiver, they are routed directly to the RS232 input connector on the PC. Thereby the advantage of direct communication between the transmitter and the PC can be utilized. Expensive analog equipment is avoided and display of the signals on the PC screen as well as signal analysis can be performed. The system has been tested and was found to be stable and highly reliable.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 5","pages":"Pages 435-440"},"PeriodicalIF":0.0,"publicationDate":"1993-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90083-B","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19220298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
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