Keiichiro Uchi
Tohoku University
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Publication
Featured researches published by Keiichiro Uchi.
Electroencephalography and Clinical Neurophysiology | 1998
Haruo Nakagawa; Takashige Namima; Masataka Aizawa; Keiichiro Uchi; Yasuhiro Kaiho; Kazuyuki Yoshikawa; Seiichi Orikasa; Nobukazu Nakasato
The aim of this study is to localize the primary sensory cortex of urogenital organs in the human brain. Using a newly developed MRI-linked magnetoencephalography system, we measured somatosensory evoked magnetic fields (SEFs) for unilateral stimuli on the dorsal penile nerve (DPN), posterior tibial nerve (PTN) and median nerve (MN). In five healthy male subjects, SEFs were clearly observed. Peak latency of the first cortical components were 63.8 +/- 9.2 ms for DPN, 39.8 +/- 3.0 ms for PTN and 20.7 +/- 0.7 ms for MN stimuli. Peak amplitude of the first cortical components were 63.1 +/- 10.8 fT for DPN, 160.2 +/- 50.1 fT for PTN and 335.2 +/- 70.3 fT for MN stimuli. Isofield map for the peak latencies indicated a single dipolar pattern for DPN as well as for PTN and MN stimuli. Using a single current dipole model, all SEF sources were localized on the contralateral central sulcus to the stimuli, indicating the primary sensory cortex. The DPN sources were localized on the interhemispheric surfaces, corresponding to previous speculations by direct cerebral stimulation. This non-invasive SEF technique promises further brain functional mapping for the urogenital organs.
International Journal of Urology | 2004
Yasuhiro Kaiho; Takashige Namima; Haruo Nakagawa; Masataka Aizawa; Keiichiro Uchi; Yoshihiro Ikeda; A. Takeuchi; Yoichi Arai
Abstract Background: To investigate normal changes in the bulbocavernosus reflex (BCR) during the micturition cycle, we examined the change in BCR during the micturition cycle using an evoked potential reaction of the BCR (BCR‐EP).
Transactions of the Japan Society of Mechanical Engineers. C | 1999
Mami Tanaka; Kentaro Hirano; Hiroki Goto; Takasige Namima; Keiichiro Uchi; Zhongwei Jiang; Hidetoshi Matsuki; Yoshikatsu Tanahshi; Seiichi Orikasa; Seiji Chonan
This paper is concerned with the development of an artificial urethral valve for treating urinary incontinence, which is driven by shape memory alloy actuators. Three types of valves are assembled and their opening and closing functions are examined experimentally by using the urethrae of male dogs. The latest model is driven by the non-contact induction heating system using power transmission coils. It is found that all of them show good opening and closing functions. The energy to drive the valve is transmitted by using an implanted coil of which outside diameter is 60 mm.
Bio-medical Materials and Engineering | 1999
Mami Tanaka; Kentaro Hirano; H. Goto; Takasige Namima; Keiichiro Uchi; Zhongwei Jiang; Hidetoshi Matsuki; Yoshikatsu Tanahashi; Seiichi Orikasa; Seiji Chonan
The Japanese Journal of Urology | 2000
Ichiro Shintaku; Yasuyoshi Suzuki; Keiichiro Uchi; Masayoshi Morita; Yoshio Terasawa
The Japanese Journal of Urology | 2000
Yasuhiro Kaiho; Takashige Namima; Keiichiro Uchi; Haruo Nakagawa; Masataka Aizawa; A. Takeuchi; Yosuke Nishimura; Tetsutaro Ohnuma; Seiichi Orikasa
The Japanese Journal of Urology | 1994
Haruo Nakagawa; Takashige Namima; Masataka Aizawa; Keiichiro Uchi; Seiichi Orikasa
International Journal of Applied Electromagnetics and Mechanics | 1999
Seiji Chonan; Zhongwei Jiang; Mami Tanaka; Jun Tanikawa; Kentaro Hirano; Seiichi Orikasa; Takashige Namima; Keiichiro Uchi
The Japanese Journal of Urology | 2000
Yasuhiro Kaiho; Takashige Namima; Masataka Aizawa; Haruo Nakagawa; Keiichiro Uchi; Seiichi Orikasa
The Japanese Journal of Urology | 1999
Yasuhiro Kaiho; Takashige Namima; Keiichiro Uchi; Haruo Nakagawa; Masataka Aizawa; Seiichi Orikasa
