BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard struc...BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard structure and ill-defined borders,it can however be mistaken for malignant tumors such as sarcomas.CASE SUMMARY We investigate the case of a 64-year-old male with proliferative myositis of the abdominal wall,who was preoperatively administered a needle aspiration biopsy and given a simple excision and patch repair.We then compared it with other similar cases to determine the effectiveness of this treatment method.CONCLUSION Resection with follow-up observation has shown to be an effective treatment method for proliferative myositis.To avoid unnecessarily extended or destructive resection,a thorough and conclusive diagnosis is crucial,which requires adequate imaging and pathological knowledge.展开更多
Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks....Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks.In this study,finite element analysis is used to calculate the stress distribution in a patch repaired defective gas pipe under internal pressure.The pipe is assumed to be buried at a depth of 125 cm.The material is assumed to be medium density PE80B,where the patch material was selected from high density polyethylene(HDPE).During the loading process,the seasonal pipe temperature changes,surcharge loads,soil column weight,and soil-pipe interaction were included in the analysis.Four types of patch arrangements were selected to repair the damaged pipe.The shape of the defect hole was deemed as circular or elliptic.With respect to elliptic defects,various minor to major diameter ratios,a/b,were selected to simulate a circular to a crack shaped defect.Based on the results,the semi-circular and saddle fusion patches decrease the peak von Mises stress in the pipe by almost the same amount.However,the minimum peak von Mises stress in the patch corresponds to the saddle fusion repair arrangement.Based on the results,with respect to a saddle fusion repair,when the shape of the defect approaches a crack,the peak von Mises stress in the pipe almost doubles and exceeds the pipe allowable stress for a working life of 50 years.With respect to higher values of a/b,the stress level in the patch repaired pipe is significantly below its limiting value for the same life expectancy.展开更多
BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and recon...BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and reconstruction. CASE SUMMARY A 71-year-old female patient was diagnosed with distal cholangiocarcinoma. After preoperative examination and rigorous preoperative preparation, the patient underwent LPD using 3D laparoscopy on July 17, 2018. During the surgery, we found that the tumor invaded the right wall of the portal vein;thus, pancreaticoduodenectomy combined with partial portal vein wall resection was performed. The defect of the portal vein wall was approximately 2.5 cm × 1.0 cm. The hepatic ligamentum teres was excised by laparoscopy and then recanalized in vitro. Following recanalization, the hepatic ligamentum teres was cut longitudinally and then trimmed into vascular patches that were then used to reconstruct the defect of the portal vein through 3D laparoscopy. The operative time was 560 min, and intraoperative blood loss was 100 mL. The duration of the blood occlusion time was 63 min. No blood transfusion was required. The patient underwent enhanced recovery after surgery procedures after the operation. The patient was discharged on postoperative day 11. Follow-up for 6 months after discharge showed no stenosis of the portal vein and good patency of blood flow. CONCLUSION It is safe and feasible to use the hepatic ligamentum teres patch to repair portal vein in LPD. However, the long-term patency of this technique for venous reconstruction requires further investigation.展开更多
The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normall...The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a through-width crack.Therefore,a debonding patch detection technique based on fiber optic interferometry is proposed.A quasi-impulse loading is applied with a rubberhead hammer and the total elongation of a surface-mounted optical fiber along the length of the repair material is measured as a function of load position.When a debonding patch is present,the induced sudden slope or sign change on the plot of fiber integral strain v.s.load position will reveal the extent and the location of the debonded area.The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.展开更多
In order to investigate the evolution of the venous patch blood inter face after implantation, an experimental model utilizing an autologous venous patch to repair an infrarenal abdominal aortic defect in rats was dev...In order to investigate the evolution of the venous patch blood inter face after implantation, an experimental model utilizing an autologous venous patch to repair an infrarenal abdominal aortic defect in rats was developed. A small piece of both the jugular vein and the aorta were first excised. After implantation and reestablishment of blood flow, the animals were subsequently sacrificed in groups of 3 at the following intervals: 10 seconds, 1, 10, 30 minutes, 1, 6, 12, 24 hours, 7, 30 and 90 days. All the patches and adjacent aortae were collected and studied using scanning electron microscopy. The results of our present show that: 1) the extensive endothelial lesion of both the autologous vein patch and the adjacent aorta is presented before implantation due to operative manipulation; 2) after blood flow reestablishment, the patch and the adjacent aortic interface are reactive to platelets and other blood cells; 3) the new cellular lining begins to appear from the 7th day after implantation, but it is not complete at 3 months; 4)from the model, the endothelial repair of autologous venous patch and its adjacent aorta is a very slow process.展开更多
基金Supported by Yonghua Mou’s Famous Doctor Studio,No.2020-42.
文摘BACKGROUND Proliferative myositis is a rare benign tumor that is typically self-limiting and does not become malignant.It can be cured by simple resection without reported recurrence.Due to its rapid growth,hard structure and ill-defined borders,it can however be mistaken for malignant tumors such as sarcomas.CASE SUMMARY We investigate the case of a 64-year-old male with proliferative myositis of the abdominal wall,who was preoperatively administered a needle aspiration biopsy and given a simple excision and patch repair.We then compared it with other similar cases to determine the effectiveness of this treatment method.CONCLUSION Resection with follow-up observation has shown to be an effective treatment method for proliferative myositis.To avoid unnecessarily extended or destructive resection,a thorough and conclusive diagnosis is crucial,which requires adequate imaging and pathological knowledge.
文摘Advantages of polyethylene pipes over traditional steel or metal pipes have increased industry interest in the use of polyethylene(PE)pipelines for underground applications and especially in gas distribution networks.In this study,finite element analysis is used to calculate the stress distribution in a patch repaired defective gas pipe under internal pressure.The pipe is assumed to be buried at a depth of 125 cm.The material is assumed to be medium density PE80B,where the patch material was selected from high density polyethylene(HDPE).During the loading process,the seasonal pipe temperature changes,surcharge loads,soil column weight,and soil-pipe interaction were included in the analysis.Four types of patch arrangements were selected to repair the damaged pipe.The shape of the defect hole was deemed as circular or elliptic.With respect to elliptic defects,various minor to major diameter ratios,a/b,were selected to simulate a circular to a crack shaped defect.Based on the results,the semi-circular and saddle fusion patches decrease the peak von Mises stress in the pipe by almost the same amount.However,the minimum peak von Mises stress in the patch corresponds to the saddle fusion repair arrangement.Based on the results,with respect to a saddle fusion repair,when the shape of the defect approaches a crack,the peak von Mises stress in the pipe almost doubles and exceeds the pipe allowable stress for a working life of 50 years.With respect to higher values of a/b,the stress level in the patch repaired pipe is significantly below its limiting value for the same life expectancy.
文摘BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and reconstruction. CASE SUMMARY A 71-year-old female patient was diagnosed with distal cholangiocarcinoma. After preoperative examination and rigorous preoperative preparation, the patient underwent LPD using 3D laparoscopy on July 17, 2018. During the surgery, we found that the tumor invaded the right wall of the portal vein;thus, pancreaticoduodenectomy combined with partial portal vein wall resection was performed. The defect of the portal vein wall was approximately 2.5 cm × 1.0 cm. The hepatic ligamentum teres was excised by laparoscopy and then recanalized in vitro. Following recanalization, the hepatic ligamentum teres was cut longitudinally and then trimmed into vascular patches that were then used to reconstruct the defect of the portal vein through 3D laparoscopy. The operative time was 560 min, and intraoperative blood loss was 100 mL. The duration of the blood occlusion time was 63 min. No blood transfusion was required. The patient underwent enhanced recovery after surgery procedures after the operation. The patient was discharged on postoperative day 11. Follow-up for 6 months after discharge showed no stenosis of the portal vein and good patency of blood flow. CONCLUSION It is safe and feasible to use the hepatic ligamentum teres patch to repair portal vein in LPD. However, the long-term patency of this technique for venous reconstruction requires further investigation.
基金supported by the National Natural Science Foundation of China(No.51278156)the Basic Project of Shenzhen Science & Technology Program(No.JCYJ2017030155815876)
文摘The interfacial debonding in fiber-reinforced plastic(FRP)strengthened repair material will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a through-width crack.Therefore,a debonding patch detection technique based on fiber optic interferometry is proposed.A quasi-impulse loading is applied with a rubberhead hammer and the total elongation of a surface-mounted optical fiber along the length of the repair material is measured as a function of load position.When a debonding patch is present,the induced sudden slope or sign change on the plot of fiber integral strain v.s.load position will reveal the extent and the location of the debonded area.The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.
文摘In order to investigate the evolution of the venous patch blood inter face after implantation, an experimental model utilizing an autologous venous patch to repair an infrarenal abdominal aortic defect in rats was developed. A small piece of both the jugular vein and the aorta were first excised. After implantation and reestablishment of blood flow, the animals were subsequently sacrificed in groups of 3 at the following intervals: 10 seconds, 1, 10, 30 minutes, 1, 6, 12, 24 hours, 7, 30 and 90 days. All the patches and adjacent aortae were collected and studied using scanning electron microscopy. The results of our present show that: 1) the extensive endothelial lesion of both the autologous vein patch and the adjacent aorta is presented before implantation due to operative manipulation; 2) after blood flow reestablishment, the patch and the adjacent aortic interface are reactive to platelets and other blood cells; 3) the new cellular lining begins to appear from the 7th day after implantation, but it is not complete at 3 months; 4)from the model, the endothelial repair of autologous venous patch and its adjacent aorta is a very slow process.
