Penetrating aortic ulcers is rare in clinical practice,and it is necessary to intervene in this type of aortic perforating ulcer because it can be accompanied by major arterial dissection and intermural hematoma.With ...Penetrating aortic ulcers is rare in clinical practice,and it is necessary to intervene in this type of aortic perforating ulcer because it can be accompanied by major arterial dissection and intermural hematoma.With the widespread application and technical advancement of follow-up thoracic aortic endovascular repair(TEVAR),endovascular treatment has become the first choice for symptomatic aortic perforating ulcers.In this review,we will review the diagnosis,diagnosis and endovascular treatment of aortic perforating ulcer.展开更多
Ballistic behaviour of different zones of post-weld heat-treated(PWHT)magnesium alloy(AZ31B)target against 7.62 mm×39 mm armour-piercing(AP)projectile with a striking velocity of(430±20)m/s was determined.Ma...Ballistic behaviour of different zones of post-weld heat-treated(PWHT)magnesium alloy(AZ31B)target against 7.62 mm×39 mm armour-piercing(AP)projectile with a striking velocity of(430±20)m/s was determined.Magnesium alloy(AZ31B)welded joints were prepared by using friction stir welding(FSW)process and subjected to different heat treatment conditions.The microhardness values of non-heat-treated and heat-treated FSW joints were investigated.The results indicated that PWHT process(250°C,1 h)has improved the microhardness of heat-treated FSW joints.Scanning electron microscope(SEM)microstructure showed that heat treatment has caused the formation of fineα-Mg grains and tiny precipitates and made the dissolution ofβ-Mg17Al12 phase into the Mg matrix.The ballistic behaviour of PWHT zones was estimated by measuring the depth of penetration(DOP)of the projectile.Lower DOP value was observed for the base metal zone(BMZ)of a heat-treated welded joint.Post ballistic SEM examinations on the cross-section of all three zones of crater region showed the formation of adiabatic shear band(ASB).展开更多
BACKGROUND A penetrating injury of a hollow viscus is an obvious indication for an exploratory laparotomy,but is not typically an indication for endoscopic treatment.CASE SUMMARY A 27-year-old man visited the emergenc...BACKGROUND A penetrating injury of a hollow viscus is an obvious indication for an exploratory laparotomy,but is not typically an indication for endoscopic treatment.CASE SUMMARY A 27-year-old man visited the emergency department with a self-inflicted abdominal stab wound.Injuries to the colon and ileum were detected,but an injury to the second portion of the duodenum was missed.On the day following admission to our institution,the patient became hemodynamically unstable with massive hematochezia,although there was no evidence of bleeding in the Levin tube or Jackson-Pratt drain.We thus performed an upper gastrointestinal endoscopy and discovered a missed duodenal injury that was actively bleeding.An endoscopic band ligation was performed for hemostasis and closure of the perforation.The patient was subsequently discharged without any complications.CONCLUSION A penetrating injury of the duodenum can be overlooked,so careful abdominal exploration is very important.If a missed duodenal injury is suspected,a cautious endoscopic approach may be helpful.展开更多
基金supported by a grant from 2019-2020 Shandong Province Traditional Chinese Medicine Science and Technology Development Plan(No.2019-0928).
文摘Penetrating aortic ulcers is rare in clinical practice,and it is necessary to intervene in this type of aortic perforating ulcer because it can be accompanied by major arterial dissection and intermural hematoma.With the widespread application and technical advancement of follow-up thoracic aortic endovascular repair(TEVAR),endovascular treatment has become the first choice for symptomatic aortic perforating ulcers.In this review,we will review the diagnosis,diagnosis and endovascular treatment of aortic perforating ulcer.
文摘Ballistic behaviour of different zones of post-weld heat-treated(PWHT)magnesium alloy(AZ31B)target against 7.62 mm×39 mm armour-piercing(AP)projectile with a striking velocity of(430±20)m/s was determined.Magnesium alloy(AZ31B)welded joints were prepared by using friction stir welding(FSW)process and subjected to different heat treatment conditions.The microhardness values of non-heat-treated and heat-treated FSW joints were investigated.The results indicated that PWHT process(250°C,1 h)has improved the microhardness of heat-treated FSW joints.Scanning electron microscope(SEM)microstructure showed that heat treatment has caused the formation of fineα-Mg grains and tiny precipitates and made the dissolution ofβ-Mg17Al12 phase into the Mg matrix.The ballistic behaviour of PWHT zones was estimated by measuring the depth of penetration(DOP)of the projectile.Lower DOP value was observed for the base metal zone(BMZ)of a heat-treated welded joint.Post ballistic SEM examinations on the cross-section of all three zones of crater region showed the formation of adiabatic shear band(ASB).
文摘BACKGROUND A penetrating injury of a hollow viscus is an obvious indication for an exploratory laparotomy,but is not typically an indication for endoscopic treatment.CASE SUMMARY A 27-year-old man visited the emergency department with a self-inflicted abdominal stab wound.Injuries to the colon and ileum were detected,but an injury to the second portion of the duodenum was missed.On the day following admission to our institution,the patient became hemodynamically unstable with massive hematochezia,although there was no evidence of bleeding in the Levin tube or Jackson-Pratt drain.We thus performed an upper gastrointestinal endoscopy and discovered a missed duodenal injury that was actively bleeding.An endoscopic band ligation was performed for hemostasis and closure of the perforation.The patient was subsequently discharged without any complications.CONCLUSION A penetrating injury of the duodenum can be overlooked,so careful abdominal exploration is very important.If a missed duodenal injury is suspected,a cautious endoscopic approach may be helpful.
