著者

酒井 利奈 糸満 盛憲 根武谷 吾 馬渕 清資

出版者

バイオメカニズム学会

雑誌

バイオメカニズム学会誌 (ISSN:02850885)

巻号頁・発行日

vol.29, no.4, pp.210-218, 2005-11-01

参考文献数

18

被引用文献数

4 2

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セメントレス人工股関節の初期固定においては,広範囲・低応力接触が重要と考えられている.一方,工学分野においては,力学的安定状態は三点固定に代表される接触部の制限が望ましいと考えられている.これは相反する理念であり,人工関節の強固な固定を実現するためには,ステム上の適切な部位に制限した接触を目指すべきである.広範囲接触を求めた場合,固定部位が流動的に動く危険性があるからである.本研究においては,対象として固定法の概念が特徴的である既存の3種類の人工股関節PerFix SV^[○!R](JMM, JPN), IMC^[○!R](JMM, JPN), VerSys^[○!R](Zimmer, USA)を用い応力解析と応力測定を行い固定法の評価を行った.生物学的な固定に到達する以前の初期段階においては,近位部に流動的でない応力分布を有することが望ましい.従来一般に信じられている低応力という基準は改めるべきである.

著者

一二三 奏 根武谷 吾 熊谷 寛

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 (ISSN:18824978)

巻号頁・発行日

vol.86, no.5, pp.450-458, 2016 (Released:2016-11-11)

参考文献数

13

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Evaluation of lung function is a typical application of electrical impedance tomography (EIT) and a wearable EIT has been developed to give easy use and reliable EIT information in an intensive care medicine. However, chest shape information was important factor to decide measurement accuracy and it was very difficult to measure from a patient on a bedside in an intensive care unit. Therefore, we proposed a novel estimation method of a chest shape using curvature data and chest circumference that would be possible to measure with our wearable EIT. Measurement accuracy was evaluated by applying the proposed method to an ellipse shape with 20cm in X-axis and 10cm in Y-axis, the same ellipse with 20% random noise and two CT images of thorax. To evaluate accuracy of estimated shape, we defined eccentricity ‘e’ that was aspect ratio of estimated shape and compared it between actual and estimated shapes respectively. Error in eccentricity ‘e’ was approximately 3% in ellipse shape without noise, 7% in ellipse shape with noise and 7% in two CT images respectively. The result was considered that our proposed method was useful to estimate shape for accurate EIT measurement using a wearable EIT.

著者

根武谷 吾 平賀 琢也 氏平 政伸

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.50, no.8, pp.580-587, 2014 (Released:2014-08-15)

参考文献数

21

被引用文献数

1 3

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We report the results of a preliminary trial to visualize a cell during freezing process using microscopic electrical impedance tomography (micro-EIT). A printed circuit board was developed for micro-EIT with two measurement chambers, 5mm in diameter and 1.6mm in depth. These chambers were filled with ethanol (2mS/cm) which was then kept at -30°C by placing it on a copper block filled with liquid nitrogen and by using a heater with a programmable controller. A grain of Citrus Sudachi and an egg of Cypselurus Agoo Agoo were placed into the measurement chamber and were recorded data during freezing by using a CCD microscope and micro-EIT. When the sample started freezing, the brightness of the sample became higher and the relative impedance in micro-EIT image also increased. Similar results were obtained in all the four trials respectively. Therefore, these results indicate that EIT is useful to observe freezing process of a cell.

著者

根武谷 吾 山嵜 佐織 野城 真理

雑誌

生体・生理工学シンポジウム論文集

巻号頁・発行日

vol.15, pp.233-236, 2000-10-13

被引用文献数

3