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이용규,조택우,정희성,이진하,홍영권 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.5
Penile incarceration is a serious disease that requires prompt intervention to prevent various complications. A 76-year-old male visited our emergency room complaining of penile swelling. The penile swelling had been caused by a metallic bearing placed at the base of the penis 7 days earlier. The ring had a 4.7cm outside diameter and 2.1cm internal diameter, with a thickness of 1.5cm. Because the swelling of penis distal to the constricting ring was so severe, removal of the ring was difficult. Several methods were attempted to remove the bearing, such as squeezing, aspiration and cutting with a steel saw, all of which were unsuccessful. A string method, with a Nelaton catheter, was then successfully used, which took just 5 minutes to remove the bearing. Mild abrasion of the penile skin was the only complication.
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박동수,조택우,이용규,이영태,홍영권,장웅기 연세대학교의과대학 2006 Yonsei medical journal Vol.47 No.5
The purpose of this study was to evaluate the effect and investigate the putative mechanism of botulinum toxin type A (BTA) applied to the treatment of benign prostatic hyperplasia (BPH). A total of 52 patients with symptomatic BPH were evaluated. Transperineal intraprostatic injection under transrectal ultrasonography was carried out. BTA dissolved in 4 to 9mL of saline was used from 100U to 300U, according to prostate volume. Twenty-six patients received only BTA (BT group), and 26 received both BTA and one month of an α-adrenergic antagonist (BTα group). The therapeutic outcomes were evaluated by comparing parameters such as international prostate symptom score (IPSS), quality of life, prostate specific antigen, prostate volume, post-void residual urine, and peak urinary flow rate. At the one month follow- up, 18 patients in the BT group and 21 in the BTα group had subjective symptomatic relief (p=0.337). Only IPSS5 (weak stream) was significantly different between the BT group and BTα groups (p=0.034). At the three month follow-up, 39 patients had subjective symptomatic relief. The storage symptoms were improved more than the voiding symptoms. Additionally, about 50 percent of the patients whose voiding symptom improved expressed improved erectile function. BTA injection seems to be an alternative treatment for BPH. The differences after the one month evaluation between the BT and the BTα groups might suggest that the adrenergic influence could be relatively reinforced by the anticholinergic effect of BTA. Nitric oxide would thus be involved in a BTA action mechanism in BPH.
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이진하,이용규,조택우,안희정,박동수 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.8
Exraadrenal paragangliomas are rare tumors of a neural crest origin. Their preoperative diagnosis can be suspected from the clinical history and biochemical examination of the catecholamines or their metabolic by- products. Surgery is the mainstay of therapy, but surgical removal makes an additional problem for the repair of the ureteral defect if a paraganglioma is located near the ureter or if it encloses the ureter. The ureteral repair often poses a therapeutic dilemma, and especially when the ureteral defect is too extensive to be repaired with traditional methods. We report here on a case of successful replacement with using appendix for the repair of a long ureteral defect that was caused by a retroperitoneal paraganglioma.
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하부요로증상을 보이는 전립선비대증에서 전립선 내 Botulinum Toxin Type A(BTA) 주입요법의 초기경험과 경요도적 전립선절제술과의 단기효과 비교
박동수,이용규,정희성,조택우,이진하,홍영권,이영태 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.11
Purpose: To retrospectively compare the results of botulinum toxin type A(BTA) with those of transurethral resection of the prostate(TURP) in the treatment of benign prostatic hypertrophy(BPH) and to evaluate the effect of BTA. Materials and Methods: The changes of symptom after BTA injection into prostate(BIP) and TURP in 26 patients treated with BIP and 81 patients treated with TURP were analysed retrospectively. All BPH-related medications were stopped immediately after BTA administration. To evaluate the effect of BIP, the parameters such as International Prostate Symptom Score (IPSS), quality of life(QoL), prostate-specific antigen(PSA), prostate volume, post-void residual urine and maximum flow rate were measured both before and 1 month after BIP. Results: In both groups, IPSS and QoL were improved significantly after treatment, but the effectiveness of TURP was much superior to that of BIP. Among the patients with a prostate volume under 40ml, IPSS was improved by 27.5% in the BTA group and 38% in the TURP group. QoL was improved by 31.8% in the BTA group and 51% in the TURP group, but the difference between the two groups was not statistically significant. Among the patients with a prostate volume over 40ml, IPSS was improved by 24.7% in the BTA group and 47.6% in the TURP group. QoL was improved by 18.9% in the BTA group and 44.4% in the TURP group, and the difference was statistically significant between the two groups. Conclusions: Although both BIP and TURP significantly improved the clinical outcome, the latter was far superior to the former in improving voiding symptoms caused by BPH. However, BIP can be a new therapeutic option for patients with a small prostate volume or who want more minimally invasive treatment.
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A Study to improve dimensional accuracy of forged gear
Y. S. Lee(이영선),T. W. Jung(정택우),J. H. Lee(이정환),J. R. Cho(조종래),Y. H. Moon(문영훈) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The dimension of forged part is different from that of die. Therefore, a more precise die dimension is necessarys to produce the precise part, considering the dimensional changes form forging die to final part. In this paper, both experimental and FEM analysis are performed to investigate the effect of several features including die dimension at each forging step and heat-treatment on final part accuracy in the closed-die upsetting. The dimension of forged part is checked at each stage as machined die, clod forged, and post-heat-treatment steps. The elastic characteristics and thermal influences on forging stage are analyzed numerically by the DEFORM-2D<SUP>TM</SUP>. The effect of residual stress after heat-treatment on forged part could be considered successfully by using DEFORM-HT<SUP>TM</SUP>.
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