{"title":"Modeling and computer simulation of the effect of degree of autoregulation on arteriovenous malformation occlusion","authors":"Huijuan Mao, S. Reisman","doi":"10.1109/NEBC.1994.305180","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305180","url":null,"abstract":"A new model and computer simulation of an intracranial cerebral arteriovenous malformation (AVM) is developed based on an existing model which doesn't include a variable degree of cerebral autoregulation that occurs in AVM patients. By modeling and computer simulation, the authors investigate the relationship between the resultant oedema or haemorrhage after AVM resection and the degree of cerebral autoregulation. The simulation results suggest that the resultant problems following AVM occlusion can be very severe for patients without normal functional autoregulation.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125058485","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}
{"title":"Transcutaneous energy and information transfer for biomedical implants","authors":"R. Gaumond","doi":"10.1109/NEBC.1994.305182","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305182","url":null,"abstract":"Summary form only received as follows. Systems delivering energy and information to implanted devices via magnetic induction provide an alternative to the use of percutaneous wire leads for long-term medical implants. Design tradeoffs are governed by the conflicting demands of energy transfer efficiency, communication bandwidth, insensitivity to changes in coil coupling variation, and concerns about patient quality-of-life. Systems range in size from that of the waist-encircling transformer developed for energizing ventricular assist devices, to miniature encapsulated systems intended for intramuscular implantation via hypodermic. Information transfer bandwidth may be considerable, as in the case of the cochlear prosthesis. In high-energy transfer applications, selection of operating frequency involves tradeoffs between tissue thermal and electronic switching losses which tend to increase with frequency and losses in the tuned-circuits driving a coil which are inversely related to frequency. These systems have been in regular use since at least the time of the transcutaneously recharged pacemaker, and new applications continue to be developed.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114133257","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}
P. Reu, P. Casalmir, L. Ostrander, B.Y. Lee, W. Yoon
{"title":"Pressures at the residual limb-prosthesis interface","authors":"P. Reu, P. Casalmir, L. Ostrander, B.Y. Lee, W. Yoon","doi":"10.1109/NEBC.1994.305185","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305185","url":null,"abstract":"The pressures at the surface of the residual lower limb during ambulation are affected by the prosthesis fit and by the material choices in the prosthesis. This study is concerned with the design and application of a data acquisition system for use in studying the pressures in the below-knee amputee during ambulation. The goal was to develop a system that could be easily used with a number of patients and not interfere with the normal fit of the prosthesis. Data was collected from 10 patients, and demonstrated that the measurement system is capable of obtaining data using the patient's own prosthesis. The system has potential for use in the improvement of material choice and prosthetic fit to reduce discomfort and tissue damage.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125453257","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}
{"title":"The man-machine interaction in central nursing stations","authors":"S. Swaminathan, H. Gage, D. Kristol, P. Engler","doi":"10.1109/NEBC.1994.305157","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305157","url":null,"abstract":"Presents an analysis of a complex man-machine system, namely a central nursing station. A central nursing station consists of the following components: the nurses who monitor the condition of the patients (the human element of the system), the instruments which are used for monitoring (the machine element of the system), and lastly the hospital and the wards (the environmental elements of the system). A smooth interaction of all three elements of the system is essential for the efficient functioning of the central nursing station. The analysis presented here is based on the observation of a typical central nursing station at St. Barnabas Medical Center in Livingston, New Jersey. There were certain drawbacks in the existing system, such as the noise level, inferior arrangement of the controls and displays, inferior workplace design and improper function allocation. All these aspects are taken into account and suitable recommendations for improving the system performance are suggested. The authors have also considered other relevant aspects of the system and recommendations for improving the performance will be given from time to time.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127933802","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}
{"title":"A simple electrical model of acute and chronic injury (CTD) processes","authors":"J. LaCourse, T. McCoy","doi":"10.1109/NEBC.1994.305173","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305173","url":null,"abstract":"A simple electrical analog model is used to understand the mechanisms of acute versus chronic disease processes, especially cumulative trauma disease. The model employs an RC circuit with inputs that allows typical exposure regimes.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131818293","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}
{"title":"Development of a testing model for an intraventricular impedance imaging system","authors":"Wei Wei, S. Kun, R. Peura","doi":"10.1109/NEBC.1994.305169","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305169","url":null,"abstract":"Intraventricular impedance imaging (III) is a technique for assessment of cardiac function. Presently, there is a need to develop an in vitro testing system for evaluation of the III system. The aim of the research described here is to develop such a testing device. The device consists of a computerized 3D catheter positioner, a ventricular volume regulator and several ventricle simulators. These modules are controlled by a PC-based custom-built software package. The developed hardware is structured in modules. The testing model will be used for the evaluation of static and dynamic characteristics of the III system.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131011553","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}
J.P. Ciervo, J. Gardner, R. Gaumond, D. Geselowitz
{"title":"Characterization of pressure oscillations in the Penn State EVAD and mock circulatory system","authors":"J.P. Ciervo, J. Gardner, R. Gaumond, D. Geselowitz","doi":"10.1109/NEBC.1994.305188","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305188","url":null,"abstract":"Previous experiments using the Penn State electric ventricular assist device (EVAD) on the Penn State mock circulatory system show anomalous pressure oscillations in pressure traces taken from the ventricular sac. A lumped parameter mathematical model was developed to characterize the origin of these oscillations. The model was based on a valveless EVAD connected to an aortic tube terminating In a capacitance element. The system was divided into convenient control volumes to which the momentum and continuity equations were applied. A key parameter of the model is the nonlinear quasisteady compliance of the ventricle. The resulting set of independent equations were solved on a computer and compared to measurements taken from the corresponding physical system. The model shows pressure oscillations with similar characteristics to those found in instantaneous pressure traces taken from the physical system.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130852090","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}
{"title":"Joint energy and Laplacian regularization in the inverse problem of electrocardiography","authors":"G. Ahmad, D. Brooks, G.M. Maratos, R. Macleod","doi":"10.1109/NEBC.1994.305176","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305176","url":null,"abstract":"In the inverse problem of electrocardiography one attempts to characterize cardiac electrical activity based on noninvasive measurements on the torso surface and knowledge of body geometry. This problem is ill-conditioned and requires regularization. Traditional methods minimize a spatial error at each time instant or a temporal error at each spatial location. Here the authors describe a method which attempts to use more than one spatial constraint in the regularization of the inverse problem at each time instant.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"29 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132884621","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}
{"title":"Minimum variance deconvolution based-speech enhancement system for a new generation of hearing aids","authors":"Huiqin Gao, M. Savic, Jeffrey Scott Sorensen","doi":"10.1109/NEBC.1994.305172","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305172","url":null,"abstract":"Describes a novel method for the enhancement of speech of a particular speaker in a noisy multispeaker environment. Many potential applications of the method are possible including the implementation in a new generation of hearing aids. The system is based on the minimum variance deconvolution (MVD) algorithm. The method was tested using the TIMIT speech database. The utterances of two speakers were first combined to create a multispeaker environment, and then separated using the MVD algorithm. The intelligibility of the separated and enhanced speech was high. Likewise the frequency spectra of the original speech were very similar to the spectra of the separated and enhanced speech for each of the two speakers.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124961062","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}
B. He, G. Aldea, T. Mullen, A. Amoundas, A. Chung, R. Cohen
{"title":"Localizing myocardial ischemia by means of body surface Laplacian imaging","authors":"B. He, G. Aldea, T. Mullen, A. Amoundas, A. Chung, R. Cohen","doi":"10.1109/NEBC.1994.305170","DOIUrl":"https://doi.org/10.1109/NEBC.1994.305170","url":null,"abstract":"The authors have investigated the sensitivity of body surface Laplacian imaging (BSLI) to localize and image myocardial ischemias in a closed chest pig model. The present study suggests that BSLI provides high spatial resolution in noninvasively localizing acute myocardial ischemia, and that the precordial Laplacian ECG provides higher sensitivity in sensing ischemic activity as compared with the unipolar ECG.<<ETX>>","PeriodicalId":117140,"journal":{"name":"Proceedings of 1994 20th Annual Northeast Bioengineering Conference","volume":"93 Pt 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128497626","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}