Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130254
Umit Aydin, Y. Serinağaoğlu
At this study the main motivation is to solve inverse problem of ECG with Kalman filter. In order to obtain feasible solutions determination of the state transition matrix (STM) correctly is vital. In literature the STM is usually found by using the test data itself which is not a realistic scenario. The major goal of this study is to determine STM without using test data. For that purpose a two stage method is suggested. At the first step the probability density function (pdf) is calculated using training sets and then this pdf is used to find Bayes-MAP solution which uses only spatial information. At the second step, the Bayes-MAP solution is used to find STM and later on, that STM is used in Kalman filter to obtain final results. It is seen that the results obtained with this method are better then normal Bayes-MAP results and the errors are within acceptable limits. So it is concluded that the usage of Bayes-MAP solutions in STM determination is a serious alternative for STM estimation.
{"title":"Estimation of state transition matrix in the Kalman filter based inverse ECG solution with the help of training sets","authors":"Umit Aydin, Y. Serinağaoğlu","doi":"10.1109/BIYOMUT.2009.5130254","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130254","url":null,"abstract":"At this study the main motivation is to solve inverse problem of ECG with Kalman filter. In order to obtain feasible solutions determination of the state transition matrix (STM) correctly is vital. In literature the STM is usually found by using the test data itself which is not a realistic scenario. The major goal of this study is to determine STM without using test data. For that purpose a two stage method is suggested. At the first step the probability density function (pdf) is calculated using training sets and then this pdf is used to find Bayes-MAP solution which uses only spatial information. At the second step, the Bayes-MAP solution is used to find STM and later on, that STM is used in Kalman filter to obtain final results. It is seen that the results obtained with this method are better then normal Bayes-MAP results and the errors are within acceptable limits. So it is concluded that the usage of Bayes-MAP solutions in STM determination is a serious alternative for STM estimation.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122480544","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130311
H. Dogan, O. Dicle, C. Guzelis
Prior to the liver transplantation and tumor resection operations, the extraction of the vessel system which specifies the segments of the liver, from the Computed Tomography Angiography (CTA) images is an important organ segmentation task. In this paper, the computer experiment results on the application of the Hessian based vessel filter for the extraction of the liver vessels and the labeling of the main vessels are presented.
{"title":"Extraction of the liver vessels from the abdomen CTA images by Hessian-based vessel filter","authors":"H. Dogan, O. Dicle, C. Guzelis","doi":"10.1109/BIYOMUT.2009.5130311","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130311","url":null,"abstract":"Prior to the liver transplantation and tumor resection operations, the extraction of the vessel system which specifies the segments of the liver, from the Computed Tomography Angiography (CTA) images is an important organ segmentation task. In this paper, the computer experiment results on the application of the Hessian based vessel filter for the extraction of the liver vessels and the labeling of the main vessels are presented.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121751311","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130256
S. Gune, K. Polat, M. Dursun, Ş. Yosunkaya
Sleep staging has an important role in determining sleep disorders such as sleepiness, human fatigue etc. Sleep staging is generally done according to Rechtschaffen and Kales standard (RKS) using EEG signal obtained from PSG signals taken from patient subjects who come with any sleep disorders. Sleep stages are generally divided into three stages including awake, REM and N-REM (stage 1, stage 2, and stage 3). In this study, time domain features of EEG, EOG of right and left eyes, and chin EMG signals belonging to sleep stages were investigated and correlation between these time domain features and sleep stages was calculated. The used time domain features are mean value, standard deviation, peak value, skewness, kurtosis, and shape factor belonging to EEG, EOG of right and left eyes, and chin EMG signals. In experimental studies, PSG recordings of 3 subjects were taken and average recording time of 6.22 h, total recording time was 18.67 h. When investigated correlation coefficients, it is seen that skewness feature in time domain features of EEG signal, standard deviation feature in time domain features of EOG signals belonging to right and left eyes, and mean value feature in time domain features of chin EMG signal were more correlated with sleep stages than other features. Consequently, a feature vector can be constituted combining features determined from time domain features of EEG, EOG belonging to right and left eyes, and chin EMG signals. This obtained feature vector can be easily used in distinguishing sleep stages.
{"title":"Examining the relevance with sleep stages of time domain features of EEG, EOG, and chin EMG signals","authors":"S. Gune, K. Polat, M. Dursun, Ş. Yosunkaya","doi":"10.1109/BIYOMUT.2009.5130256","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130256","url":null,"abstract":"Sleep staging has an important role in determining sleep disorders such as sleepiness, human fatigue etc. Sleep staging is generally done according to Rechtschaffen and Kales standard (RKS) using EEG signal obtained from PSG signals taken from patient subjects who come with any sleep disorders. Sleep stages are generally divided into three stages including awake, REM and N-REM (stage 1, stage 2, and stage 3). In this study, time domain features of EEG, EOG of right and left eyes, and chin EMG signals belonging to sleep stages were investigated and correlation between these time domain features and sleep stages was calculated. The used time domain features are mean value, standard deviation, peak value, skewness, kurtosis, and shape factor belonging to EEG, EOG of right and left eyes, and chin EMG signals. In experimental studies, PSG recordings of 3 subjects were taken and average recording time of 6.22 h, total recording time was 18.67 h. When investigated correlation coefficients, it is seen that skewness feature in time domain features of EEG signal, standard deviation feature in time domain features of EOG signals belonging to right and left eyes, and mean value feature in time domain features of chin EMG signal were more correlated with sleep stages than other features. Consequently, a feature vector can be constituted combining features determined from time domain features of EEG, EOG belonging to right and left eyes, and chin EMG signals. This obtained feature vector can be easily used in distinguishing sleep stages.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133760914","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130268
G. Yilmaz, E. Bayraktar, H. Kulah
Since fabrication of microchips by MEMS technology has emerged, microchips that can interact with biological samples like virus, bacteria, DNA has been developed. Considering the advantages such as cost, dimension and compatibility with IC fabrication, these chips have found specific application areas. Microfluids and microfluidics constitute one of the major research areas of this emerging field, BioMEMS. Micro mixers have become an important component of BioMEMS which are designed for microfluidics applications. Fluids demonstrate two types of flow regime, laminar and turbulent. Turbulent flow is more advantageous than laminar flow when mixing is considered. Creating turbulent flow within microchannels, commonly used in BioMEMS devices, is a challenging task as scaling into the micro domain causes fluids to mix solely by diffusion. This study presents a method for mixing in micro environment based on chaotic advection. The proposed micro mixer makes use of the turbulent flow induced by bubbles which are created by thermal actuation based on joule heating principle on gold electrodes.
{"title":"Design and fabrication of a chaotic mixer for BioMEMS applications","authors":"G. Yilmaz, E. Bayraktar, H. Kulah","doi":"10.1109/BIYOMUT.2009.5130268","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130268","url":null,"abstract":"Since fabrication of microchips by MEMS technology has emerged, microchips that can interact with biological samples like virus, bacteria, DNA has been developed. Considering the advantages such as cost, dimension and compatibility with IC fabrication, these chips have found specific application areas. Microfluids and microfluidics constitute one of the major research areas of this emerging field, BioMEMS. Micro mixers have become an important component of BioMEMS which are designed for microfluidics applications. Fluids demonstrate two types of flow regime, laminar and turbulent. Turbulent flow is more advantageous than laminar flow when mixing is considered. Creating turbulent flow within microchannels, commonly used in BioMEMS devices, is a challenging task as scaling into the micro domain causes fluids to mix solely by diffusion. This study presents a method for mixing in micro environment based on chaotic advection. The proposed micro mixer makes use of the turbulent flow induced by bubbles which are created by thermal actuation based on joule heating principle on gold electrodes.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134346703","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130313
Tuba Durmaz, S. Erkut, Dilek Cokeliler
In recent years, fibers are used for improving mechanical strength of acrylic-based resin which used for construction of protheses frequently. Improvement of the fiber- matrix interfase is a very important approach at redevelopment of mechanical properties. In this study, glass fibers are modified by radiofrequency (RF) plasma technique with using different monomers. Silane based monomer glisitoxypropyltrimethiloxysilane and amine based ethylenediamine (EDA)are polimerized on the glass fibers in plasma environment for application of two different approaches (hydrophobic/hydrophobic). Surface modification application is optimized with increasing power and exposure time parameters, which are used for low vacuum RF glow discharge. The change of surface properties for glass fibers are characterized by measurement of static contact angle and bending strain of fiber-acrylic composites are measured with 3 point bending device. While the cost of bending strain of the composites, which is prepared by virgin glass fibers, is 127.9±9 MPa, the maximum mechanical strength has been obtained at amine based plasma polymerization technique (150.2±4 MPa). The mechanical strenght is improved according to the working parameters that are used in silane based plasma polymerisation technique (141.2±7 MPa, power: 40W, Exposure Time: 30 min) It's proved with contact angle measurement that gaining less hydrofobic property to the surface is an appropriate approach.
{"title":"Improvement of mechanical performances by plasma polymerisation technique for composite biomaterials","authors":"Tuba Durmaz, S. Erkut, Dilek Cokeliler","doi":"10.1109/BIYOMUT.2009.5130313","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130313","url":null,"abstract":"In recent years, fibers are used for improving mechanical strength of acrylic-based resin which used for construction of protheses frequently. Improvement of the fiber- matrix interfase is a very important approach at redevelopment of mechanical properties. In this study, glass fibers are modified by radiofrequency (RF) plasma technique with using different monomers. Silane based monomer glisitoxypropyltrimethiloxysilane and amine based ethylenediamine (EDA)are polimerized on the glass fibers in plasma environment for application of two different approaches (hydrophobic/hydrophobic). Surface modification application is optimized with increasing power and exposure time parameters, which are used for low vacuum RF glow discharge. The change of surface properties for glass fibers are characterized by measurement of static contact angle and bending strain of fiber-acrylic composites are measured with 3 point bending device. While the cost of bending strain of the composites, which is prepared by virgin glass fibers, is 127.9±9 MPa, the maximum mechanical strength has been obtained at amine based plasma polymerization technique (150.2±4 MPa). The mechanical strenght is improved according to the working parameters that are used in silane based plasma polymerisation technique (141.2±7 MPa, power: 40W, Exposure Time: 30 min) It's proved with contact angle measurement that gaining less hydrofobic property to the surface is an appropriate approach.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133375520","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130365
Mustafa Doğan, Okan Karatay, Dilek Cokeliler, I. Kocum
Various methods for fabricating nanoscale polymeric fibers are investigated at large, e.g. tissue engineering . Electrospinning is the most versatile process among them. Materials such as polymer, composites and metal nanofibres have been fabricated with electrospinning techniques. It is important that many parameters and post, pre-processes should be investigated thoroughly to be able to optimize the method. Characteristics of the electrostatic field, and polymer solution constitute the main design criteria. The proposed experimental setup has been implemented with newly designed high voltage power suply which can be adjusted resiliently in frequency and power amplitude.
{"title":"Design and Implementation of Electrospinning System","authors":"Mustafa Doğan, Okan Karatay, Dilek Cokeliler, I. Kocum","doi":"10.1109/BIYOMUT.2009.5130365","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130365","url":null,"abstract":"Various methods for fabricating nanoscale polymeric fibers are investigated at large, e.g. tissue engineering . Electrospinning is the most versatile process among them. Materials such as polymer, composites and metal nanofibres have been fabricated with electrospinning techniques. It is important that many parameters and post, pre-processes should be investigated thoroughly to be able to optimize the method. Characteristics of the electrostatic field, and polymer solution constitute the main design criteria. The proposed experimental setup has been implemented with newly designed high voltage power suply which can be adjusted resiliently in frequency and power amplitude.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134069884","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130363
M. Yıldız, D. Yilmaz
In this study, 27 young and healthy subjects was listening to the classical and Turkish music samples which are believed to changeable the subject's emotional state. Their effects on Autonomic Nervous System (ANS) are investigated by using the heart rate variability (HRV) analysis which is accepted as a non-invasive indicator of ANS. The electrocardiogram (ECG) and respiration records were made before and during the listening music samples. Heart rate variability (HRV) signals are obtained form records and power spectral densities (PSD) of HRV are estimated. According to the results of calculated parameters, during the listening to classical music samples some statistically significant changes were occurred in sympathetic and parasympathetic activities of ANS. Turkish music samples were not causes significant differences on the ANS related HRV parameters.
{"title":"The effects of classical and turkish music samples on the Autonomic Nervous System","authors":"M. Yıldız, D. Yilmaz","doi":"10.1109/BIYOMUT.2009.5130363","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130363","url":null,"abstract":"In this study, 27 young and healthy subjects was listening to the classical and Turkish music samples which are believed to changeable the subject's emotional state. Their effects on Autonomic Nervous System (ANS) are investigated by using the heart rate variability (HRV) analysis which is accepted as a non-invasive indicator of ANS. The electrocardiogram (ECG) and respiration records were made before and during the listening music samples. Heart rate variability (HRV) signals are obtained form records and power spectral densities (PSD) of HRV are estimated. According to the results of calculated parameters, during the listening to classical music samples some statistically significant changes were occurred in sympathetic and parasympathetic activities of ANS. Turkish music samples were not causes significant differences on the ANS related HRV parameters.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114240734","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130376
Duygu Torun, M. Yıldız, Burak Guclu
The sensory response upon vibrotactile stimuli is still not entirely understood. Previously, the responses of single units from mechanoreceptive afferents and cortical neurons have been studied. There is a thorough psychophysical literature on judgements of the presence, magnitude, and frequency of vibrotactile stimuli [1–3]. However, non-invasive recording of evoked responses on the scalp have solely been determined for electrical stimuli.In this study, psychophysical detection thresholds of adult subjects were measured at various mechanical frequencies. These values were found to be consistent with the literature. To measure the frequency following brain responses, stimulus intensities were determined based on psychophysical sensation levels. Data recorded from the somatosensory cortex area via electrodes placed on scalp, were analysed with wavelet transform. The results show that, as the mechanical stimulus intensity was increased, the background activity was suppressed and the frequency-following activity during stimulus period increased. This finding was statistically significant
{"title":"Frequency following brain oscillations evoked by vibrotactile stimulation of the distal phalanx in normal subjects","authors":"Duygu Torun, M. Yıldız, Burak Guclu","doi":"10.1109/BIYOMUT.2009.5130376","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130376","url":null,"abstract":"The sensory response upon vibrotactile stimuli is still not entirely understood. Previously, the responses of single units from mechanoreceptive afferents and cortical neurons have been studied. There is a thorough psychophysical literature on judgements of the presence, magnitude, and frequency of vibrotactile stimuli [1–3]. However, non-invasive recording of evoked responses on the scalp have solely been determined for electrical stimuli.In this study, psychophysical detection thresholds of adult subjects were measured at various mechanical frequencies. These values were found to be consistent with the literature. To measure the frequency following brain responses, stimulus intensities were determined based on psychophysical sensation levels. Data recorded from the somatosensory cortex area via electrodes placed on scalp, were analysed with wavelet transform. The results show that, as the mechanical stimulus intensity was increased, the background activity was suppressed and the frequency-following activity during stimulus period increased. This finding was statistically significant","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"650 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123288376","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130305
Nimet Yildirim, Dilek Odaci, Gulsiye Ozturk, S. Alp, Y. Ergun, K. Feller, K. Dornbusch, S. Timur
Here we present a new sol-gel based fluorescent glukoz biosensor. The sensor is based on the pH sensitive fluorescent dye entrapped in a tetraethoxysilane (TEOS) based sol-gel together with glukoz oxidase. Micro-analytic sustem which can measure the pH induced chance in the fluorescens intensity due to the enzymatic reaction in spotted layer on the glass surface was used as a measuring system. The system was calibrated to glukoz. As well as characterization, glukoz biosensing in such fruit juice samples were carried out.
{"title":"Design and application of a sol-gel based fluorescent glucose arrays","authors":"Nimet Yildirim, Dilek Odaci, Gulsiye Ozturk, S. Alp, Y. Ergun, K. Feller, K. Dornbusch, S. Timur","doi":"10.1109/BIYOMUT.2009.5130305","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130305","url":null,"abstract":"Here we present a new sol-gel based fluorescent glukoz biosensor. The sensor is based on the pH sensitive fluorescent dye entrapped in a tetraethoxysilane (TEOS) based sol-gel together with glukoz oxidase. Micro-analytic sustem which can measure the pH induced chance in the fluorescens intensity due to the enzymatic reaction in spotted layer on the glass surface was used as a measuring system. The system was calibrated to glukoz. As well as characterization, glukoz biosensing in such fruit juice samples were carried out.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123577218","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130325
Pinar Koymen Cagar, N. F. Ak Azem, U. Malayoğlu, A. Cakir
Biomaterials are compatible with neighbouring tissues while implanted in body and do not cause any undesirable reactions such as coagulation and inflammation. Metallic biomaterials have found wide spread application as orthopedic prosthesis and dental implants due to their high strength, great biocompatibility and corrosion durability. But their acceptance by the living tissues in the body is very difficult, if not impossible, as they are bioinert. It is a widespread method to coat the metallic implant surfaces with bioactive ceramic films in order to increase their compatibility and improve bone apposition in the body. Although various calcium phosphate (CaP) based bioactive ceramic compounds with structure similar to the bone exist, hydroxyapatite (HAP) coatings, that has approximately the same composition with biological apatite in the body, create interests in recent years. In this study HAP films coated by electrochemical deposition method on CoCrMo implant materials and effect of solution temperature on the films were determined.
{"title":"Effect of temperature on electrochemically deposited HAP films on CoCrMo substrate","authors":"Pinar Koymen Cagar, N. F. Ak Azem, U. Malayoğlu, A. Cakir","doi":"10.1109/BIYOMUT.2009.5130325","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130325","url":null,"abstract":"Biomaterials are compatible with neighbouring tissues while implanted in body and do not cause any undesirable reactions such as coagulation and inflammation. Metallic biomaterials have found wide spread application as orthopedic prosthesis and dental implants due to their high strength, great biocompatibility and corrosion durability. But their acceptance by the living tissues in the body is very difficult, if not impossible, as they are bioinert. It is a widespread method to coat the metallic implant surfaces with bioactive ceramic films in order to increase their compatibility and improve bone apposition in the body. Although various calcium phosphate (CaP) based bioactive ceramic compounds with structure similar to the bone exist, hydroxyapatite (HAP) coatings, that has approximately the same composition with biological apatite in the body, create interests in recent years. In this study HAP films coated by electrochemical deposition method on CoCrMo implant materials and effect of solution temperature on the films were determined.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121881133","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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