http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Rescue Technique for Malposition Caused by Mislabeled Stent Graft in Thoracic Aneurysm
정혁재,손봉수,김도형,이상수 대한혈관외과학회 2017 Vascular Specialist International Vol.33 No.4
The aim of this paper is to report a salvage treatment for malpositioned stent graft due to mislabeled product during thoracic endovascular aortic repair (TEVAR) in descending thoracic aneurysm (DTA). A 78-year-old male presented with 6.7×4.1 cm sized saccular DTA and 7.1×7.3 cm sized abdominal aortic aneurysm (AAA). DTA was initially treated by TEVAR and 2 months later AAA was treated by open aortic repair. Unfortunately, although the stent graft was correctly labeled for DTA, the actual size of product wrapped in a box was different contrary to our expectations. On completion angiography, proximal sealing zone showed no endoleak, however, celiac trunk and superior mesenteric artery (SMA) was found to be accidentally occluded. Through an emergent thoracotomy, distal part of stent graft was removed by cutting distal segment of stent graft and pulling out maneuver to restore blood flow. The completion angiography presented no endoleak, and celiac trunk and SMA were secured. Cutting distal segment of stent graft and pulling out maneuver is one of feasible rescue technique to maintain blood flow of occluded celiac trunk during TEVAR.
정혁재,이상수 대한혈관외과학회 2014 Vascular Specialist International Vol.30 No.2
Renal artery aneurysm (RAA) is uncommon, and the coexistence of an abdominal aortic aneurysm (AAA) is an extremely rare condition with potentially high life-threatening mortality in case of rupture. Aneurysms can be treated by en-dovascular intervention or open surgery. Although most of aneurysms are treated by endovascular intervention, open surgery is often necessary for RAAs associated with the proximal renal bifurcation or the branches in the distal renal arteries. We report a rare case of coexisting RAA with AAA treated by hybrid method, consisting of endovascular aneurysm repair for AAA and open surgery for RAA located adjacent to the distal branches of the renal artery.
정혁재,이상수 대한혈관외과학회 2014 Vascular Specialist International Vol.30 No.4
Portal vein (PV) thrombosis (PVT) is a rare condition with development of thrombosis in the PV and its branches. Further extension to the splenic and superior mesenteric vein (SMV) causes intestinal infarction, with a reported mortality of up to 50%. A variety of treatments for PVT exist including anticoagulation, thrombolysis, surgical thrombectomy, insertion of shunts, bypass surgery, and liver transplantation. We experienced a case of successfully treated by surgical thrombectomy with direct thrombolysis into the thrombosed-PV and SMV. A 31-year-old male presented worsening abdominal pain for one week. Preoperative contrast enhanced computed tomography scan revealed complete PVT extending to splenic vein and SMV. The PV was accessed surgically and opened by thrombectomy; visual inspection confirmed proximal and distal flow. Urokinase was administered directly into the inferior mesenteric vein with successful decrease in thrombus burden. The complete angiography showed complete dissolution of thrombosis in PV and SMV.
Histopathological Changes of Venous Calcification in the Arterio-Venous Fistula for Hemodialysis
정혁재,이상수 대한혈관외과학회 2013 Vascular Specialist International Vol.29 No.4
Purpose: This study suggests that venous calcification (VC) may occur within the arterialized vein (AV)of patients with chronic renal failure. VC may be the cause of arteriovenous fistula (AVF) failure. Methods: Specimens of AV were obtained during the removal of AVF to study morphological changes in the AV wall. We retrospectively analyzed 27 patients with AV specimens prepared and stained with hematoxylin and eosin, Masson’s trichrome and Verhoeff van Gieson stains. Results: Of the 27 patients, only 7 (4 males and 3 females, mean age 49.4 years) had evidence of VC in the AV (5 patients media only, 2 patients intima and media involved). AVF removal was done due to aneurym (3 cases), stenosis (2 cases), and kidney transplantation (2 cases). The mean duration from AVF construction to the repair of AVF was 88 months (range, 50 to 144 months). There were two cases of diabetes mellitus and hypertension in patients with VC. Conclusion: VC may occur within the arterialized vein in chronic kidney disease patients after AVF construction.
나노인덴테이션과 유한요소법을 결합한 철 분말의 기계적 물성 취득
정혁재,이동준,윤은유,이언식,김낙준,김형섭,Jeong, Hyeok Jae,Lee, Dong Jun,Yoon, Eun Yoo,Lee, Eon Sik,Kim, Nack Joon,Kim, Hyeong Seop 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
Stress-strain curves are fundamental properties to study characteristics of materials. Flow stress curves of the powder materials are obtained by indirect testing methods, such as tensile test with the bulk materials and powder compaction test, because it is hard to measure the stress-strain curves of the powder materials using conventional uniaxial tensile test due to the limitation of the size and shape of the specimen. Instrumented nanoindentation can measure mechanical properties of very small region from several nanometers to several micrometers, so nanoindentation technique is suitable to obtain the stress-strain curve of the powder materials. In this study, a novel technique to obtain the stress-strain curves using the combination of instrumented nanoindentation and finite element method was introduced and the flow stress curves of Fe powder were measured. Then obtained stress-strain curves were verified by the comparison of the experimental results and the FEA results for powder compaction test.