Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering最新文献_第7页

Food and Drug Administration approves lamivudine for hepatitis B. 美国食品和药物管理局批准拉米夫定治疗乙型肝炎。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

引用次数: 0

A newly designed underwater antenna and its application to underwater radio-telemetry for measuring electroencephalographic activity from the rainbow trout freely swimming in natural environments. 一种新设计的水下天线及其在水下无线电遥测中的应用，用于测量自然环境中自由游动的虹鳟的脑电图活动。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

Y Kudo, M Satou, S Kitamura, M Iwata, Y Takeuchi

引用次数: 0

Muscle activity-torque-velocity relations in human elbow extensor muscles. 人体肘关节伸肌的肌肉活动-扭矩-速度关系。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

T Uchiyama, K Akazawa

{"title":"Muscle activity-torque-velocity relations in human elbow extensor muscles.","authors":"T Uchiyama, K Akazawa","doi":"","DOIUrl":"","url":null,"abstract":"With the aid of an artificial neural network technique, we investigated relationships between the torque and extending velocity of an elbow at constant muscle activation in healthy volunteers. Each subject sat on a chair and was able to move his upper- and forearm on a shoulder-high horizontal plane. First, with the gravitational force of a weight hanging from a pulley, the subject's wrist was pulled to flex the elbow. Next, the subject was instructed to extend his elbow joint at a constant velocity. Integrated electromyograms (IEMGs), elbow joint angle and torque were measured while the elbow was being extending. Then the relationships among these three variables were modeled using an artificial neural network where IEMGs, joint angle and velocity were the inputs, and torque was the output. After back propagation learning, we presented various combinations of IEMGs, elbow joint angle and velocity to the model, and estimated the elbow joint torque to obtain the torque-velocity relationship for constant muscle activation. The torque decreased in a nearly linear manner as the velocity increased. This was caused by slow extending velocity and was explained by Hill's equation at slow velocity.","PeriodicalId":77139,"journal":{"name":"Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering","volume":"9 4","pages":"305-13"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21571053","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

Studies on eliminating interference by electromagnetic induction from power lines in ECG signals. 利用电力线电磁感应消除心电信号干扰的研究。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

Adli, Y Yamamoto, T Nakamura

引用次数: 0

Suitable location and optimum bladder width for the occluding cuff used for indirect arterial blood pressure measurements at the wrist. 用于间接测量手腕动脉血压的闭塞袖带的合适位置和最佳膀胱宽度。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

W Lu, A Tsukada, A Kawarada, K Sasaki

{"title":"Suitable location and optimum bladder width for the occluding cuff used for indirect arterial blood pressure measurements at the wrist.","authors":"W Lu, A Tsukada, A Kawarada, K Sasaki","doi":"","DOIUrl":"","url":null,"abstract":"Using a finite element method (FEM) and a volume oscillometric method with a photo-electric plethysmograph, we tried to determine which location(s) and which bladder width(s) of the occluding cuff would allow the most accurate indirect blood pressure measurements at the human wrist. Nuclear magnetic resonance imaging of the wrist allowed us to determine the geometry of two-dimensional (2D) finite element models. FEM analysis showed that the pressure transmission ratio (calculated tissue pressure: externally applied pressure) from the cuff to the radial artery (RA) was 100% when the cuff was placed over the site (L1) at which the RA crosses the most protuberant spot on the volar aspect of the distal end of the radius. In fact, the mean blood pressure (BPM) measured at this site in human subjects coincided with that measured at the upper arm (BPMA). In addition, a three-dimensional (3D) FEM was constructed by extending the 2D FEM at site L1 in the longitudinal direction to investigate the relation between pressure transmission to the RA and cuff bladder width. FEM analysis using the 3D finite element model showed that for all cuff widths greater than 0.25 times the diameter of the wrist, the external pressure was transmitted almost completely to the RA beneath the cuff center. Moreover, when the cuff width was as large as 0.45 times the diameter of the wrist, the BPM measured at site L1 in human subjects was similar to the BPMA. The theoretical and experimental results in the present study both suggest that for accurate indirect blood pressure measurements at the wrist, the L1 site is a suitable location for the occluding cuff and a cuff whose bladder width is more than one-third but less than one-half the wrist diameter can be used.","PeriodicalId":77139,"journal":{"name":"Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering","volume":"9 1","pages":"9-29"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21223462","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

Three new diseases listed for Japanese research on their treatment. 日本新列出了三种疾病的治疗研究。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

引用次数: 0

Gen-Probe, Chiron and US Red Cross to investigate new technology to provide an extra layer of safety to the blood supply. Gen-Probe、Chiron和美国红十字会将研究新技术，为血液供应提供额外的安全保障。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

引用次数: 0

Japan's first brain death judgment and subsequent organ transplants. 日本首例脑死亡判决及随后的器官移植。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

引用次数: 0

The influence of simultaneous intra-aortic balloon pumping and mechanical ventilation on hemodynamic parameters--numerical simulation. 主动脉内球囊同时泵送与机械通气对血流动力学参数的影响——数值模拟

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

M Darowski, C De Lazzari, G Ferrari, F Clemente, M Guaragno

{"title":"The influence of simultaneous intra-aortic balloon pumping and mechanical ventilation on hemodynamic parameters--numerical simulation.","authors":"M Darowski, C De Lazzari, G Ferrari, F Clemente, M Guaragno","doi":"","DOIUrl":"","url":null,"abstract":"Intra-aortic balloon counterpulsation (IABC) is one of the methods to assist circulation. Its application is supposed to increase coronary blood flow (Qcor) and myocardial oxygen supply. Mechanical ventilation of the lungs causes some side effects that influence mainly hemodynamics, i.e. it decreases cardiac output (CO) and systemic aortic pressure (Pas) but increases systemic venous pressure (Pvs). The aim of this study was to assess the influence of IABC on hemodynamic parameters when mechanical ventilation of the lungs is used as well. We assumed pathological conditions of the heart as reduced left ventricle elastance (Ev = 0.77 mmHg/cm3) and increased left ventricle rest volume (V0 = 10 cm3). Also peripheral systemic arterial resistance (Ras) took three different values. CARDIOSIM, a computer simulator of the human cardiovascular system, was used to assess the changes of hemodynamic parameters [CO, Pas, Pvs, and pulmonary arterial pressure (Pap)] when IABC and mechanical ventilation of the lungs were applied simultaneously. Computer simulation showed that application of IABC increased such variables as CO (by approximately equal to 17%), maximum value of Pas (by approximately equal to 20%), while left atrial pressure (Pla) was diminished (by approximately equal to 30%). On the other hand, Pvs and Pap were not strongly affected by IABC, but they were dramatically dependent on intrathoracic pressure. This means that Pvs, Pap, and Pla should be carefully monitored during IABC and artificial ventilation.","PeriodicalId":77139,"journal":{"name":"Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering","volume":"9 2","pages":"155-74"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21315183","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

Non-invasive blood glucose measurement by Fourier transform infrared spectroscopic analysis through the mucous membrane of the lip: application of a chalcogenide optical fiber system. 唇粘膜傅里叶变换红外光谱分析无创血糖测量:硫系光纤系统的应用。

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

T Uemura, K Nishida, M Sakakida, K Ichinose, S Shimoda, M Shichiri

{"title":"Non-invasive blood glucose measurement by Fourier transform infrared spectroscopic analysis through the mucous membrane of the lip: application of a chalcogenide optical fiber system.","authors":"T Uemura, K Nishida, M Sakakida, K Ichinose, S Shimoda, M Shichiri","doi":"","DOIUrl":"","url":null,"abstract":"Non-invasive blood glucose measurement through the mucous membrane of the lip was investigated using Fourier transform infrared (FT-IR) spectroscopy with an attenuated total reflection (ATR) prism. To achieve easy attachment and easy control of attachment pressure of the ATR prism to the mucous membrane of the lip, a chalcogenide optical fiber with an ATR prism built in the tip was used. The same glucose-specific peaks at wave numbers of 1080 and 1033 cm-1 as glucose solutions were found in a spectrum through the mucous membrane of the lip. With a constant pressure of the ATR prism to the mucous membrane of the lip of 6.7 x 10(3) dyn/cm2, coefficients of variation of measurements within the day and of day-to-day measurements were 3.8 and 5.4% respectively. To eliminate baseline drifts and interference of body constituents other than glucose, the difference absorbances at 1080 cm-1 between spectra measured at the postprandial state and background spectrum obtained at the fasting state as an individual characteristic were evaluated. Following i.v. pulsatile injection of glucose, the difference absorbances at 1080 cm-1 nicely followed the changes in blood glucose concentrations with a time delay of 4 min. In daily blood glucose monitoring, a highly significant correlation between the difference absorbances and increases in blood glucose concentrations above the fasting level was obtained (r = 0.920, P < 0.01). From these experiments, it was suggested that FT-IR spectroscopy with a chalcogenide optical fiber could be useful clinically for non-invasive monitoring of glucose through the mucous membrane of the lip.","PeriodicalId":77139,"journal":{"name":"Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering","volume":"9 2","pages":"137-53"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21315184","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