Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233450
R. Martínez, A. Vera, L. Leija
This paper presents the finite element modeling of the acoustic pressure spatial distribution of a spherically-curved transducer with operation frequency of 1.965 MHz and its comparison with the transducer characterization using a PZTZ44-0400 hydrophone. Concave transducers are only one of the different techniques used to deliver high-intensity focused ultrasound (HIFU) into a target during oncologic treatments in order to provoke tumor ablation. However, the acoustic field characterization for HIFU transducers is made at low power level in order to avoid hydrophone damage, while in therapy high acoustic power is applied. HIFU focus size is usually in the order of mm, making difficult its location during experimentation. Finite element modeling is helpful method to simulate focused ultrasound propagation and interaction in a simulated medium with ultrasonic properties similar to soft tissues. In this work, comparison is made in water as propagation wave medium.
{"title":"Finite element HIFU transducer acoustic field modeling evaluation with measurements","authors":"R. Martínez, A. Vera, L. Leija","doi":"10.1109/PAHCE.2012.6233450","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233450","url":null,"abstract":"This paper presents the finite element modeling of the acoustic pressure spatial distribution of a spherically-curved transducer with operation frequency of 1.965 MHz and its comparison with the transducer characterization using a PZTZ44-0400 hydrophone. Concave transducers are only one of the different techniques used to deliver high-intensity focused ultrasound (HIFU) into a target during oncologic treatments in order to provoke tumor ablation. However, the acoustic field characterization for HIFU transducers is made at low power level in order to avoid hydrophone damage, while in therapy high acoustic power is applied. HIFU focus size is usually in the order of mm, making difficult its location during experimentation. Finite element modeling is helpful method to simulate focused ultrasound propagation and interaction in a simulated medium with ultrasonic properties similar to soft tissues. In this work, comparison is made in water as propagation wave medium.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"3 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131316033","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233446
B. França, C. P. Carvalho, V. C. Martins, J. M. Y. Catunda, M. A. von Kruger, W. Pereira
Ultrasonic Transit Time Flowmeters (TTFM) have been performing in the last decade as a promising tool for the quantification of coronary flow during bypass surgeries. For the calibration of this type of probe it is necessary the use of flow phantoms. This study proposes to develop a pump with some particular geometric characteristics, able to simulate the left ventricle ejection pattern. In addition it was made a hydraulic circuit to simulate the main mechanical characteristics of the human vascular system. With this model monitored in real time by a pressure transducer, it was possible to obtain pressure profiles similar to those found inside the aorta. The adjustment of the firing pattern of the pump and variables that control the system resistance and viscoelasticity allow the simulation of clinical situations, as well as the analysis of the effect of each variable alone in the pressure profile. Relying on the principle that the arrangement of blood vessels occurs in parallel, it is expected that the connection of pipes with diameter, length, resistive and viscoelastic properties similar to those of specific vessels, will induce flow patterns similar to those found in the human vascular network.
{"title":"Hydraulic circuit mimicker of left ventricle ejection and pressure inside the aorta","authors":"B. França, C. P. Carvalho, V. C. Martins, J. M. Y. Catunda, M. A. von Kruger, W. Pereira","doi":"10.1109/PAHCE.2012.6233446","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233446","url":null,"abstract":"Ultrasonic Transit Time Flowmeters (TTFM) have been performing in the last decade as a promising tool for the quantification of coronary flow during bypass surgeries. For the calibration of this type of probe it is necessary the use of flow phantoms. This study proposes to develop a pump with some particular geometric characteristics, able to simulate the left ventricle ejection pattern. In addition it was made a hydraulic circuit to simulate the main mechanical characteristics of the human vascular system. With this model monitored in real time by a pressure transducer, it was possible to obtain pressure profiles similar to those found inside the aorta. The adjustment of the firing pattern of the pump and variables that control the system resistance and viscoelasticity allow the simulation of clinical situations, as well as the analysis of the effect of each variable alone in the pressure profile. Relying on the principle that the arrangement of blood vessels occurs in parallel, it is expected that the connection of pipes with diameter, length, resistive and viscoelastic properties similar to those of specific vessels, will induce flow patterns similar to those found in the human vascular network.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132985544","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233431
Juhyun Lee, N. Jen, Fei Yu, W. Dai, Hongyu Yu, T. Hsiai
In this study, we introduced an in vivo convective heat transfer-based micro-electromechanical system (MEMS) sensor that measured real-time experimental vascular shear stress values in the aortas of New Zealand White rabbits (n=4). Experiments were performed to measure flow profile changes in response to hyper-cholesterol diet and an irregular tachycardia condition. We have shown that these conditions induce shear stress changes indicative of pre-atherosclerosis regions by the MEMS thermal sensor.
{"title":"Flexible intravascular thermal sensors to assess atherosclerosis-mediated changes in hemodynamics","authors":"Juhyun Lee, N. Jen, Fei Yu, W. Dai, Hongyu Yu, T. Hsiai","doi":"10.1109/PAHCE.2012.6233431","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233431","url":null,"abstract":"In this study, we introduced an in vivo convective heat transfer-based micro-electromechanical system (MEMS) sensor that measured real-time experimental vascular shear stress values in the aortas of New Zealand White rabbits (n=4). Experiments were performed to measure flow profile changes in response to hyper-cholesterol diet and an irregular tachycardia condition. We have shown that these conditions induce shear stress changes indicative of pre-atherosclerosis regions by the MEMS thermal sensor.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114948159","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233456
D. Gomez, C. Druzgalski
Electromyography is mainly used in the assessment of neuromuscular diseases such as muscular dystrophy, myasthemia gravis or peripheral nerve disorders; however its direct relation with limb movement, muscle's electrical signal accessibility (easy to acquire) and the need in our society to come up with rehabilitation oriented practical solutions make it an approachable and attractive option to develop useful control applications. In this project the forearm muscle signal is acquired through superficial electrodes and processed with a designed circuit in which signal amplification, filtering and other conditioning take place. All of these steps are conducive to obtain a final command so that the user can control the arm prototype at his will with just a tiny muscle contraction.
{"title":"EMG controlled arm prototype forearm flexo-extension","authors":"D. Gomez, C. Druzgalski","doi":"10.1109/PAHCE.2012.6233456","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233456","url":null,"abstract":"Electromyography is mainly used in the assessment of neuromuscular diseases such as muscular dystrophy, myasthemia gravis or peripheral nerve disorders; however its direct relation with limb movement, muscle's electrical signal accessibility (easy to acquire) and the need in our society to come up with rehabilitation oriented practical solutions make it an approachable and attractive option to develop useful control applications. In this project the forearm muscle signal is acquired through superficial electrodes and processed with a designed circuit in which signal amplification, filtering and other conditioning take place. All of these steps are conducive to obtain a final command so that the user can control the arm prototype at his will with just a tiny muscle contraction.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122165510","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233424
P. Mayorga, C. Druzgalski, O. H. González
Anthropogenic activities associated to population growth impact overall health and contribute to elevated rates of cardiovascular and respiratory diseases. In this paper we propose the Lung Sound Automatic Verification (LSAV), and other modalities to represent acoustic lung signals obtained by auscultation using a digital stethoscope. The utilization of quantiles allowed a) an easier and objective assessment with smaller computational demand, b) building of less-complex Gaussian Mixed Models (GMM) than those reported previously, and c) to reach practically negligible error in healthy LS verification. These approaches relate the lung sound energy to its characteristic frequency components, which in addition to a reliable verification technique simplified the normal lung sound recognition. Once the LS are evaluated, it would be possible to simplify classification if an individual auscultatory evaluation falls into the category of normal or abnormal indicators thus providing a tool for broader medical evaluation which does not rely, as it is often the case, on a qualitative and subjective description of these sounds.
{"title":"Quantile vectors based verification of normal lung sounds","authors":"P. Mayorga, C. Druzgalski, O. H. González","doi":"10.1109/PAHCE.2012.6233424","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233424","url":null,"abstract":"Anthropogenic activities associated to population growth impact overall health and contribute to elevated rates of cardiovascular and respiratory diseases. In this paper we propose the Lung Sound Automatic Verification (LSAV), and other modalities to represent acoustic lung signals obtained by auscultation using a digital stethoscope. The utilization of quantiles allowed a) an easier and objective assessment with smaller computational demand, b) building of less-complex Gaussian Mixed Models (GMM) than those reported previously, and c) to reach practically negligible error in healthy LS verification. These approaches relate the lung sound energy to its characteristic frequency components, which in addition to a reliable verification technique simplified the normal lung sound recognition. Once the LS are evaluated, it would be possible to simplify classification if an individual auscultatory evaluation falls into the category of normal or abnormal indicators thus providing a tool for broader medical evaluation which does not rely, as it is often the case, on a qualitative and subjective description of these sounds.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123790703","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233425
H. Kerguelen, P. Gañán, L. Hoyos, N. Escobar, J. Bustamante, M. Auad
The electrospinning is a manufacturing technique that allows non-woven to create a variety of polymeric matrices. The chemical structure, mechanics, stability, functionality and other properties can be modified to match applications in coatings for vascular stents used for correction of aneurysms. The SMPU are high-performance elastomers, due to its combination of elasticity, thermal and mechanical properties, so that may be useful for coating vascular stents. In this paper we developed a team of electropinning for coating stents, the team allowed to control the process variables on various polymers.
{"title":"Electrospinning team to build coverings from vascular stents with shape memory polyurethanes (SMPU)","authors":"H. Kerguelen, P. Gañán, L. Hoyos, N. Escobar, J. Bustamante, M. Auad","doi":"10.1109/PAHCE.2012.6233425","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233425","url":null,"abstract":"The electrospinning is a manufacturing technique that allows non-woven to create a variety of polymeric matrices. The chemical structure, mechanics, stability, functionality and other properties can be modified to match applications in coatings for vascular stents used for correction of aneurysms. The SMPU are high-performance elastomers, due to its combination of elasticity, thermal and mechanical properties, so that may be useful for coating vascular stents. In this paper we developed a team of electropinning for coating stents, the team allowed to control the process variables on various polymers.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125014656","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233441
C. Toledo, R. Muñoz, L. Leija
This article presents a sEMG signal detector by means of different applications of the Discrete Wavelet Transform. A training system and protocol is used to acquire the sEMG signals. The last of four training stages is used. These signals are processed, segmented and labeled, automatically, as three different levels of contraction. The level's order (1-2-3) varies from one session to another. The automatic segmentation and label proved to work with the 20 sessions. Segmentation and labeling comparison of 4 training sessions' results is shown. The used algorithms provided good results with all 20 sessions.
{"title":"sEMG signal detector using discrete wavelet transform","authors":"C. Toledo, R. Muñoz, L. Leija","doi":"10.1109/PAHCE.2012.6233441","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233441","url":null,"abstract":"This article presents a sEMG signal detector by means of different applications of the Discrete Wavelet Transform. A training system and protocol is used to acquire the sEMG signals. The last of four training stages is used. These signals are processed, segmented and labeled, automatically, as three different levels of contraction. The level's order (1-2-3) varies from one session to another. The automatic segmentation and label proved to work with the 20 sessions. Segmentation and labeling comparison of 4 training sessions' results is shown. The used algorithms provided good results with all 20 sessions.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127545630","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233435
A. P. S. Silva, J. Palermo, A. Gibertoni, J. A. Ferreira, R. M. A. Almeida, L. Marroig
Medical equipment inventory control is important for any hospital. Its measurement and management directly affects healthcare providers' decisions about budgets, administration and maintenance. In this paper the authors present a case study, conducted at Albert Einstein Hospital which uses both Six Sigma and LEAN methodology/tools to improve the inventory control over critical medical equipments. The Six Sigma philosophy aims to diminish the errors committed, avoiding rework while LEAN aims at reducing all form of losses and wastes in the manufacturing process. Significant results were attained, increasing the selected indicator (complete forms) from 62,6% to 99,4%, which benefit both the hospital's management as well as the patient's level of care.
{"title":"Inventory quality control in clinical engineering: A Lean Six Sigma approach","authors":"A. P. S. Silva, J. Palermo, A. Gibertoni, J. A. Ferreira, R. M. A. Almeida, L. Marroig","doi":"10.1109/PAHCE.2012.6233435","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233435","url":null,"abstract":"Medical equipment inventory control is important for any hospital. Its measurement and management directly affects healthcare providers' decisions about budgets, administration and maintenance. In this paper the authors present a case study, conducted at Albert Einstein Hospital which uses both Six Sigma and LEAN methodology/tools to improve the inventory control over critical medical equipments. The Six Sigma philosophy aims to diminish the errors committed, avoiding rework while LEAN aims at reducing all form of losses and wastes in the manufacturing process. Significant results were attained, increasing the selected indicator (complete forms) from 62,6% to 99,4%, which benefit both the hospital's management as well as the patient's level of care.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"493 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115330005","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233427
L. I. B. Santos, M. F. Calixto, J. L. Da Silva, G. C. Peron, L. Brasil, K. V. P. de Meneses
The use computer games in cognitive rehabilitation programs is a new trend by health professionals. In this perspective, nine computer games were developed for cognitive stimulation of the elderly people with cognitive deficit.
{"title":"Computer games with therapeutic potential for maintaining cognitive abilities of elderly people","authors":"L. I. B. Santos, M. F. Calixto, J. L. Da Silva, G. C. Peron, L. Brasil, K. V. P. de Meneses","doi":"10.1109/PAHCE.2012.6233427","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233427","url":null,"abstract":"The use computer games in cognitive rehabilitation programs is a new trend by health professionals. In this perspective, nine computer games were developed for cognitive stimulation of the elderly people with cognitive deficit.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126500243","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}
Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233433
D. Lorias, A. Minor, D. Gamino, R. Ordorica, R. Martinez
In medicine, specifically in the area of minimally invasive surgery (MIS), there is a great need to develop new and accessible intelligent system for educational technology and evaluation methodologies to ensure that the surgeon dominates the laparoscopic technique. Innovative training systems have limited their academic impact, due inter alia to the high prices of acquisition and maintenance. The aim of the article is to show an option to record objectively the laparoscopic skills through a simple and affordable alternative to assess the resident surgeon their acquired laparoscopic skills. Metodology. A review of the actual systems and the adaptation of different tasks to a physical trainer were done. For each task, is evaluated the reliability of the results from the system. Result. The evaluations of the different tasks show acceptable reliability. The evaluation of the characteristics indicated that the system can be a viable option for the measurement of basic laparoscopic skills. Conclusion. There are technological available alternative for the objective measurement of laparoscopic skills. This measurement can be done by hybrid systems combining the advantages of virtual and physical systems.
{"title":"Integration of a system for evaluating in a box trainer: Hybrid system for laparoscopic training","authors":"D. Lorias, A. Minor, D. Gamino, R. Ordorica, R. Martinez","doi":"10.1109/PAHCE.2012.6233433","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233433","url":null,"abstract":"In medicine, specifically in the area of minimally invasive surgery (MIS), there is a great need to develop new and accessible intelligent system for educational technology and evaluation methodologies to ensure that the surgeon dominates the laparoscopic technique. Innovative training systems have limited their academic impact, due inter alia to the high prices of acquisition and maintenance. The aim of the article is to show an option to record objectively the laparoscopic skills through a simple and affordable alternative to assess the resident surgeon their acquired laparoscopic skills. Metodology. A review of the actual systems and the adaptation of different tasks to a physical trainer were done. For each task, is evaluated the reliability of the results from the system. Result. The evaluations of the different tasks show acceptable reliability. The evaluation of the characteristics indicated that the system can be a viable option for the measurement of basic laparoscopic skills. Conclusion. There are technological available alternative for the objective measurement of laparoscopic skills. This measurement can be done by hybrid systems combining the advantages of virtual and physical systems.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132491841","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}
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