Journal of biomedical engineering最新文献_第8页

Pre-term infant volume measurements by acoustic plethysmography 用声学容积描记法测量早产儿体积

Journal of biomedical engineering Pub Date : 1993-03-01 DOI: 10.1016/0141-5425(93)90036-X

O.S. Valerio Jimenez, J.K. Moon, C.L. Jensen, F.A. Vohra, H.P. Sheng

引用次数: 8

Strain gauge plethysmography for the detection of deep venous thrombosis 用于检测深静脉血栓的应变式容积描记术

Journal of biomedical engineering Pub Date : 1993-03-01 DOI: 10.1016/0141-5425(93)90043-X

S. Croal, J. Birkmyre, M. McNally, C. Hamilton, R. Mollan

{"title":"Strain gauge plethysmography for the detection of deep venous thrombosis","authors":"S. Croal, J. Birkmyre, M. McNally, C. Hamilton, R. Mollan","doi":"10.1016/0141-5425(93)90043-X","DOIUrl":"10.1016/0141-5425(93)90043-X","url":null,"abstract":"<div><p>Deep venous thrombosis is a widely recognized medical problem which results in significant morbidity and mortality. Venography is the current ‘gold standard’ diagnostic test for deep venous thrombosis; however it is costly, invasive and is unnecessarily performed in 50% of cases. This paper describes a self-contained, non-invasive system for automatic venous occlusion plethysmographic measurement and analysis. An examination of 274 symptomatic limbs was conducted using strain gauge plethysmography and a subsequent venographic examination was then performed. The plethysmographic results were then compared with venography so as to develop a means of discrimination for thrombotic and non-thrombotic limbs. Strain gauge plethysmography using the Belfast DVT Screener yielded a sensitivity of 100% and a sensitivity of 66.3% for proximal segment DVT. The efficacy of the discriminatory algorithm was then tested for the diagnosis of DVT in a further 101 symptomatic patients. A sensitivity of 94.7% and a specificity of 81.7% were observed for strain gauge plethysmography for proximal segment thrombosis in this patient group. The Belfast DVT Screener is highly sensitive for deep venous thrombosis and may be used to reduce the need for venography, which is of benefit to both the patient and clinician.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 2","pages":"Pages 135-139"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90043-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19443265","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: 22

A feasibility study of a filtration type autotransfusion device 过滤式自体输血装置的可行性研究

Journal of biomedical engineering Pub Date : 1993-03-01 DOI: 10.1016/0141-5425(93)90045-Z

C. Legallais, M.Y. Jaffrin

{"title":"A feasibility study of a filtration type autotransfusion device","authors":"C. Legallais, M.Y. Jaffrin","doi":"10.1016/0141-5425(93)90045-Z","DOIUrl":"10.1016/0141-5425(93)90045-Z","url":null,"abstract":"<div><p>This paper describes a feasibility study of a disposable autotransfusion device for blood salvage during surgery. The goal was to concentrate hemolyzed blood at 20% hematocrit to 50% while reducing the plasma free hemoglobin concentration from 10 to 1.5 g/l. The device should have a total membrane area of less than 0.6 m<sup>2</sup> and should be able to process ten 500 ml blood bags. The processing time for each blood bag should not exceed 5 min. The basic idea was to use several polypropylene hollow fibre plasma filters of 0.1 m<sup>2</sup> in series with saline addition between them. Since the mean pore size is 0.5μ m, anticoagulant and plasma hemoglobin can pass freely across the membrane and their concentration is reduced by dilution. The process was first modelled using mass balance equations for red blood cells and plasma hemoglobin in order to find the best device configuration (number of filters and dilutions). It was found that a three filter system could theoretically meet the requirements, if the last filter had a larger surface area (0.3 m<sup>2</sup>). Some experiments permitted us to prove the validity of this model and to define fully the third filtration stage. Finally, it was shown that the treatment of a 500 ml blood bag required three filtration stages (whose surface areas were respectively 0.1, 0.1 and 0.3 m<sup>2</sup>) and the use of 750 ml of saline solution added between the filters. This configuration also offers the possibility of using a vacuum driving force instead of pumps, so that the device becomes completely disposable.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 2","pages":"Pages 143-147"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90045-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19443267","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: 5

Optimized 3D coordinate reconstruction from paired stereographs using a calibrated phantom 优化三维坐标重建从成对的立体图像使用校准的幻影

Journal of biomedical engineering Pub Date : 1993-03-01 DOI: 10.1016/0141-5425(93)90050-9

C.F. Small, J.T. Bryant

引用次数: 5

Testing of small connective tissue specimens for the determination of the mechanical behaviour of atherosclerotic plaques 小结缔组织标本测定动脉粥样硬化斑块力学行为的试验

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90089-H

C.L. Lendon , M.J. Davies , P.D. Richardson , G.V.R. Born

引用次数: 59

Comment on: The energetics of paraplegic walking 点评:截瘫行走的能量学

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90099-K

Martin Kemp MSc CEng MBES

引用次数: 0

Examining motion in the cervical spine I: imaging systems and measurement techniques 检查颈椎运动I:成像系统和测量技术

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90086-E

P. Roozmon , S.A. Gracovetsky , G.J. Gouw , N. Newman

{"title":"Examining motion in the cervical spine I: imaging systems and measurement techniques","authors":"P. Roozmon , S.A. Gracovetsky , G.J. Gouw , N. Newman","doi":"10.1016/0141-5425(93)90086-E","DOIUrl":"10.1016/0141-5425(93)90086-E","url":null,"abstract":"<div><p>Instruments for measuring mobility in the cervical spine range from plumb-lines and inclinometers to sophisticated optoelectronic systems. In order to investigate the need and possible uses for an enhancement to a new diagnostic instrument, we examine some of the available diagnostic systems suitable for cervical motion analysis. These should be of practical use in a clinical setting for the diagnosis of soft tissue injuries. We begin by evaluating the respective roles of plain radiographs, cineradiography, computer tomography, and magnetic resonance imaging in examining the cervical spine. Then we consider Moiré photography, inclinometers, and some opto-electronic scanners, as well as the mathematical techniques needed to correlate skin and spine motion with these devices. We find that there does not appear to be an effective non-invasive tool for comprehensive clinical cervical motion analysis; in particular, coupled joint motion is inadequately quantified. Improperly diagnosed cervical spine injuries, such as hyperextension and hyperflexion, may result in chronic long-term effects. Therefore, instrumentation that would permit objective, routine clinical evaluation of patients could help to avoid such situations.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 1","pages":"Pages 5-12"},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90086-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19403056","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: 40

An intermediate loading rate technique for the determination of mechanical properties of human femoral cortical bone 测定人股骨皮质骨力学性能的中间加载率技术

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90095-G

D. Raftopoulos , E. Katsamanis , F. Saul , W. Liu , S. Saddemi

引用次数: 37

Cardiovascular applications of the ALOPEX optimization technique ALOPEX优化技术在心血管领域的应用

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90097-I

G.S. Friedrichs , D.S. Berger , E. Micheli-Tzanakou

{"title":"Cardiovascular applications of the ALOPEX optimization technique","authors":"G.S. Friedrichs , D.S. Berger , E. Micheli-Tzanakou","doi":"10.1016/0141-5425(93)90097-I","DOIUrl":"10.1016/0141-5425(93)90097-I","url":null,"abstract":"<div><p>ALOPEX is a general optimization process incorporating a cost function containing a large number of parameters which may be simultaneously adjusted until the cost function reaches an optimum (maximum or minimum); local extremes are avoided by introducing random noise into the procedure. In this paper, ALOPEX is incorporated into a simple haemodynamic study in which an electric analogue model of the left ventricle is used to develop equations of myocardial stroke work. Pilot experiments were undertaken in rabbits (<em>n</em> = 5) to gauge the effectiveness of this optimizing technique. In the control state, calculated stroke work for the rabbit was determined to be 50 ± 7 mmHg ml, while ALOPEX predicted a stroke work of 51 ± 7 mmHg ml. ALOPEX is capable of following changing cardiovascular states when pharmacological agents are introduced. For example, after nitroprusside treatment, stroke work was reduced by 38 ± 6% (<em>P</em> < 0.05) while ALOPEX predicted a 42 ± 4% reduction from baseline (<em>P</em> < 0.05). Methoxamine treatment increased stroke work by 74 ± 34%, while ALOPEX predicted a 73 ± 43% increase above control values. There were no statistical differences between calculated and ALOPEX predicted values. Individual model parameters such as maximum left ventricular elastance (<em>E</em><sub><em>max</em></sub>) and left ventricular end diastolic volume (<em>EDV</em>) were also predicted correctly by ALOPEX. We have found that the ALOPEX optimization technique is useful in predicting components of multi-parametric functions. In particular, we have shown it to be adaptable to a simple haemodynamic model.</p></div>","PeriodicalId":75992,"journal":{"name":"Journal of biomedical engineering","volume":"15 1","pages":"Pages 74-78"},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0141-5425(93)90097-I","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19404975","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: 2

Drijber and Finlay (1992) — Universal joint slippage as a cause of Hofmann half-frame external fixator failure. J Biomed Eng 1992; 14: 509-15 Drijber and Finlay(1992) -万向关节滑移是Hofmann半框架外固定架失效的原因之一。生物医学进展[J];14: 509 - 15所示

Journal of biomedical engineering Pub Date : 1993-01-01 DOI: 10.1016/0141-5425(93)90100-D

Eur Ing Professor JP Paul FEng

引用次数: 1