• Journal of Chest Surgery
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• 제29권3호
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• pp.337-341
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• 1996

A 40-year-old male patient who had ascending aortic pseudoaneurysm Involving right coronary artery obstruction and thoracic descending aortic pseudoaneurysm was successfully managed by two-stage operation. Repair of intimal tear of ascending aortic pseudoaneurysm with a patch of woven dacron vascular graft and right coronary artery bypass graft with great saphenous vein were performed in first stage operation. On 28 days postoperatively, Repair of intimal tear of descending aortic pseudoaneurysm with a patch of woven dacron vascular graft was done under the femorofemoral partial cardiopulri!onary bypass in second stage operation. The patient was discharged at postoperative 13th days without any evident.

• Journal of Chest Surgery
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• 제23권4호
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• pp.654-658
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• 1990

Between January of 1980 and December of 1989, we are encountered 121 cases of Down syndrome here at Yonsei University Medical Center. of these being endocardial cushion defect, ventricular septal defect, tetralogy of Fallot, atrial septal defect, patent ductus arteriosus and complicated anomalies. The mean age was 1 month 2 years with the sexual division at 31 males and 29 females. Among these 60 patients, 10 of them were treated trough surgical management, 8 of them being open heart surgeries, the 8 open heart surgeries are broken down as follow: 4 total correction of ECD, 2 patch repair of VSD, 1 total correction of TOF, 1 patch repair of ASD secundum. Another 2 operative management are ligation of PDA and modified Blalock - Taussig shunt of TOF. Postoperatively all patients were weaned and extubated on an artificial ventilator without any respiratory complications, and were discharged without incident.

• Journal of Chest Surgery
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• 제25권6호
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• pp.605-610
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• 1992

Improving intraoperative and postoperative myocardial protection and better construction and design of valvular prosthesis has reduced the mortality of MVR. But, ventricular rupture after MVR occurred occasionally and represented a potentially lethal complication. Transverse midventricular disruption presented as refractory myocardial failure immediately on termination of bypass or later often on initial period of good hemadynamics. From Jan., 1985 through Dec., 1991 131 MVRs were performed as isolated or combined procedures. Rupture of the posterior wall of left ventricle was observed in 2 patients. There were 2 type III ruptures Prevention is of utmost importance, and by taking certain precautions, the chance of ventricular rupture can be reduced. Repair should always be done by patch technique in the aid of the use of cardiopulmonary bypass with cardioplegic arrest. When the laceration is in the middle of the posterior left ventricle, external repair with the pericardial patch can be attempted first.

• Journal of Chest Surgery
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• 제44권3호
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• pp.266-268
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• 2011

Cystic adventitial disease is rare, but it is one of the well-recognized causes of non-atherosclerotic arterial stenosis or obstruction. Despite one of its most common symptoms being chronic intermittent claudication, it may be misdiagnosed as arterial embolism when presented with acute ischemic symptoms. Surgical resection is recommended because of recurrence or a low success rate with aspiration or endovascular stent. We performed resection and repair with autologous vein patch for cystic adventitial disease of the popliteal artery of a 57-year-old man presenting with pain, pallor, and paresthesia, without any postoperative complications or recurrence.

• Structural Engineering and Mechanics
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• 제88권3호
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• pp.201-208
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• 2023

In this work, the effect of the correction fibers direction on the efficiency of repairing damaged composite plates was highlighted. The composite plates studied in this work consist of eight layers of graphite/epoxy, while the patch used in this repair consists of four layers of the same type. The results obtained in this work, whether with regard to the experimental or analytical side, showed that the fibers orientation affects the repair efficiency, so the closer the angle of fibers inclination is to the tensile strength direction, the performance of the composite material is ideal. Hence, we conclude that the composite materials with longitudinal fibers (Parallel to tensile strength) is the most powerful and efficient material in performance.

• Journal of Chest Surgery
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• 제24권2호
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• pp.115-122
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• 1991

From April 1986 to December 1989, 25 infants under the age of 12 months with tetralogy of Fallot were operated on. Age ranged from 3 to 12 months[mean 8.9$\pm$4.9 months] and mean body weight was 7.8$\pm$ 2.6kg. All the patients were deeply cyanotic, 12 of them experienced anoxic spell. Transannular patch was laid down in 19 patients, in 7 of them monocuspid patch was utilized. Postrepair P RV/LV was measured at operation room in 17 patients[mean 0.48$\pm$0. 14]. Hospital mortality was 20Yo. Causes of deaths include right ventricular failure and low cardiac output. The mortality was closely related with patient`s age and body surface area at operation. Also higher mortality was noticed in patients having major associated anomaly or previous palliative operation, preoperative management with propranolol and transannular repair. 18 patients were followed up for 12 to 50 months with a mean follow-up time of 24 months after operation. There were no late deaths and late ventricular arrhythmia or congestive heart failure was not detected as yet. Redo operation was performed in one case because of residual pulmonic stenosis. Considering several advantages of early primary repair, primary repair of symptomatic infants with tetralogy of Fallot should be encouraged despite somewhat high mortality rate as yet and better results could be anticipated along with improvement of myocardial protection method and postoperative care.

• Journal of Mechanical Science and Technology
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• 제16권5호
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• pp.599-608
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• 2002

Finite element analysis for the stress intensity factor (SIF) at the skin/stiffener structure with inclined central crack repaired by composite stiffened panels is developed. A numerical investigation was conducted to characterize the fracture behavior and crack growth behavior at the inclined crack. In order to investigate the crack growth direction, maximum tangential stress (MTS) criterion are used. Also, this paper is to study the performance of the effective bonded composite patch repair of a plate containing an inclined central through-crack. The main objective of this research is the validation of the inclined crack patching design. In this paper, the reduction of stress intensity factors at the crack-tip and prediction of crack growth direction are determined to evaluate the effects of various non-dimensional design parameter including; composite patch thickness and stiffener distance. We report the results of finite element analysis on the stiffener locations and crack slant angles and discuss them in this paper. The research on cracked structure subjected to mixed mode loading is accomplished and concludes that more work using a different approaches is necessary. The authors hope the present study will aid those who are responsible for the repair of damaged aircraft structures and also provide general repair guidelines.

• Journal of Chest Surgery
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• 제22권5호
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• pp.739-747
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• 1989

Between September 1986, and August 1989, eight infants underwent operation for repair of coarctation of the aorta in the first year of life. The patients included 7 males and 1 female ranging in age 19 days and 9 months. Weights ranged from 3.5 Kg to 7 Kg [mean 5 Kg]. All patients had preductal coarctation of the aorta. Each infant had associated cardiac anomalies, including ventricular septal defect [7 infants] and patent ductus arteriosus [5 infants]. All had intractable congestive heart failure, despite aggressive medical therapy. Pressure gradient across the coarctation ranged from 10 mmHg to 60 mmHg. Operative techniques were subclavian flap aortoplasty in five cases, Gore-Tex patch aortoplasty in three cases. In addition to coarctation repair, six infants had concomitant banding of the pulmonary artery. Four infants required ventilator support for several days. There was no operative death. Complications developed in two. One infant had tracheal stenosis after a tracheostomy. Another infant had restenosis of the aorta revealed by cardiac catheterization 30 months after surgery. The pressure gradient was 30 mmHg, necessitating balloon dilatation aortoplasty. Results were satisfactory. During follow up, we performed total correction procedures [patch closure of the ventricular septal defect, infundibulectomy, pulmonary valvotomy and pulmonary artery angioplasty] in one case. Continuing follow-up finds all patients in good condition.

• 한국항공우주학회지
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• 제30권5호
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• pp.48-55
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• 2002

항공기용 복합재의 보수를 보조하는, 보수 제안 서비스 (Repair Advisory Service, RAS)라는 인터넷 기반의 소프트웨어가 개발되었다. 웹 브라우저를 유저인터페이스로 하는 RAS는 보수된 복합재의 파괴하중 계산, 구조 보수 지시서 (SRM) 제공 및 검색 등을 보수 엔지니어에게 거리에 제약을 받지 않고 제공한다. 본 논문에서는 RAS의 기능을 겹치기 기술(lap repair)에 의해 보수된 복합재의 파괴하중을 계산하는 모델을 예로 보여준다. 이 모델은 기초복합재와 보수층에 있는 각 복합재 층의 이방성을 고려하여 개발되었고, 기초복합재와 보수복합재 사이의 경계층의 비탄성을 고려하였다. 모델에 의한 파괴하중은 실험결과와 유사한 결과를 보여준다.

• Structural Engineering and Mechanics
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• 제18권3호
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• pp.277-286
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• 2004

Defective metallic components and structures are being repaired with bonded composite patches to improve overall mechanical and fatigue properties. In this study, fatigue crack growth tests were conducted on pre-cracked 7075/T6 Aluminum substrates with and without bonded Boron/epoxy patches. A considerable increase in the fatigue life and a decrease in the stress intensity factor (SIF) were observed as the number of patch plies increased. The experimental results demonstrate that the patch configurations and patch thickness can enhance fatigue life by order of magnitude. Quantitative comparisons between analytical and experimental data were made, and the analytical model based on a modified Rose's analytical solution appears to best estimate the fatigue life.