The squeeze casting method with local pressure compensation was proposed to form a flywheel housing component with a weight of 35 kg.The numerical simulation,microstructure observation and phase characterization were ...The squeeze casting method with local pressure compensation was proposed to form a flywheel housing component with a weight of 35 kg.The numerical simulation,microstructure observation and phase characterization were performed,and the influence of local pressure compensation on feeding of thick-wall position,microstructure and mechanical properties of the formed components were discussed.Results show that the molten metal keeps a good fluidity and the filling is complete during the filling process.Although the solidification at thick-wall positions of the mounting ports is slow,the local pressure compensation effectively realizes the local forced feeding,significantly eliminating the shrinkage cavity defects.In the microstructure of AlSi9Mg alloy,α-Al primarily consists of fragmented dendrites and rosette grains,while eutectic Si predominantly comprises needles and short rods.The impact of local pressure compensation on strength is relatively minimal,yet its influence on elongation is considerable.Following local pressure compensation,the average elongation at the compensated areas is 9.18%,which represents a 44.90%higher than that before compensation.The average tensile strength is 209.1 MPa,and the average yield strength is 100.6 MPa.The local pressure compensation can significantly reduce or even eliminate the internal defects in the 35 kg large-weight components formed by squeeze casting.展开更多
BACKGROUND A hybrid operating room(Hybrid-OR)is a surgical theatre that combines a conventional operating room with advanced medical imaging devices.There are still plenty of limitations when endovascular treatment or...BACKGROUND A hybrid operating room(Hybrid-OR)is a surgical theatre that combines a conventional operating room with advanced medical imaging devices.There are still plenty of limitations when endovascular treatment or microsurgical treatment is used individually to treat large or giant carotid-ophthalmic aneurysms.AIM To explore and summarize the technical features and effectiveness of the application of a Hybrid-OR in managing major intracranial carotid-ophthalmic aneurysms.METHODS The Department of Neurosurgery treated 12 cases of large or giant intracranial carotid-ophthalmic aneurysms between March 2013 and December 2019 in a Hybrid-OR.All cases were treated with clipping and parent vessel reconstruction.RESULTS With the assistance of the Hybrid-OR,the rate of incomplete intraoperative aneurysm clipping decreased from 25%(3/12)to 0%,while the rate of vessel stenosis decreased from 16.7%(2/12)to 8.35%(1/12).In terms of thromboembolic events,ischemic infarction complication occurred in only one patient,and none of the patients experienced embolic infarction complications.All 12 patients were followed for an average of 3 years,and no aneurysms recurred.The postoperative recovery was evaluated with the modified Rankin Scale(mRS):11 patients showed no symptoms(mRS=0),1 patient showed slight disability(mRS 1-2),and none of the patients had severe disability(mRS=5)or died(mRS=6).CONCLUSION The Hybrid-OR provides new ideas for the surgical clipping of large or giant intracranial carotid-ophthalmic aneurysms and decreases the rate of intraoperative vessel stenosis and unsuccessful clipping.展开更多
目的探讨基于射频识别(Radio Frequency Identification,RFID)技术的手术室耗材智慧屋管理系统的应用效果。方法利用超高频RFID技术,将手术室原有库房进行整体改造及屏蔽铺设,搭建成基于RFID的手术室耗材智慧屋管理系统,建立产品入库、...目的探讨基于射频识别(Radio Frequency Identification,RFID)技术的手术室耗材智慧屋管理系统的应用效果。方法利用超高频RFID技术,将手术室原有库房进行整体改造及屏蔽铺设,搭建成基于RFID的手术室耗材智慧屋管理系统,建立产品入库、使用登记、库存管理和查询4个模块,完成对高值耗材的全过程管理和可追溯管理。比较系统使用前后耗材管理不良事件发生率、日均管理时间、日均领用时间和领用次数以及未使用耗材归位率情况。结果系统使用后,耗材管理不良事件发生率为2.9%,显著低于系统使用前的8.8%(χ^(2)=31.601,P<0.001);耗材日均管理时间为(66.56±10.37)min,显著低于使用前(110.18±16.89)min(t=69.598,P<0.001);耗材日均领用时间和领用次数显著低于使用前(t=109.051、39.659,均P<0.001)。未使用耗材归位率由系统使用前的95.2%提高到使用后的100%。结论手术室耗材智慧屋管理系统在高值耗材管理中应用效果显著,可减少耗材管理不良事件的发生,精简耗材管理和领用环节,值得推广应用。展开更多
基金supported by the National Key R&D Program of China(No.2022YFB3404204)the National Natural Science Foundation of China(NSFC)under Grant Nos.U2241232,U2341253 and 52375317.
文摘The squeeze casting method with local pressure compensation was proposed to form a flywheel housing component with a weight of 35 kg.The numerical simulation,microstructure observation and phase characterization were performed,and the influence of local pressure compensation on feeding of thick-wall position,microstructure and mechanical properties of the formed components were discussed.Results show that the molten metal keeps a good fluidity and the filling is complete during the filling process.Although the solidification at thick-wall positions of the mounting ports is slow,the local pressure compensation effectively realizes the local forced feeding,significantly eliminating the shrinkage cavity defects.In the microstructure of AlSi9Mg alloy,α-Al primarily consists of fragmented dendrites and rosette grains,while eutectic Si predominantly comprises needles and short rods.The impact of local pressure compensation on strength is relatively minimal,yet its influence on elongation is considerable.Following local pressure compensation,the average elongation at the compensated areas is 9.18%,which represents a 44.90%higher than that before compensation.The average tensile strength is 209.1 MPa,and the average yield strength is 100.6 MPa.The local pressure compensation can significantly reduce or even eliminate the internal defects in the 35 kg large-weight components formed by squeeze casting.
基金Supported by the Tianjin Science and Technology Projects in Key Areas of Traditional Chinese Medicine,No.2018001.
文摘BACKGROUND A hybrid operating room(Hybrid-OR)is a surgical theatre that combines a conventional operating room with advanced medical imaging devices.There are still plenty of limitations when endovascular treatment or microsurgical treatment is used individually to treat large or giant carotid-ophthalmic aneurysms.AIM To explore and summarize the technical features and effectiveness of the application of a Hybrid-OR in managing major intracranial carotid-ophthalmic aneurysms.METHODS The Department of Neurosurgery treated 12 cases of large or giant intracranial carotid-ophthalmic aneurysms between March 2013 and December 2019 in a Hybrid-OR.All cases were treated with clipping and parent vessel reconstruction.RESULTS With the assistance of the Hybrid-OR,the rate of incomplete intraoperative aneurysm clipping decreased from 25%(3/12)to 0%,while the rate of vessel stenosis decreased from 16.7%(2/12)to 8.35%(1/12).In terms of thromboembolic events,ischemic infarction complication occurred in only one patient,and none of the patients experienced embolic infarction complications.All 12 patients were followed for an average of 3 years,and no aneurysms recurred.The postoperative recovery was evaluated with the modified Rankin Scale(mRS):11 patients showed no symptoms(mRS=0),1 patient showed slight disability(mRS 1-2),and none of the patients had severe disability(mRS=5)or died(mRS=6).CONCLUSION The Hybrid-OR provides new ideas for the surgical clipping of large or giant intracranial carotid-ophthalmic aneurysms and decreases the rate of intraoperative vessel stenosis and unsuccessful clipping.
文摘目的探讨基于射频识别(Radio Frequency Identification,RFID)技术的手术室耗材智慧屋管理系统的应用效果。方法利用超高频RFID技术,将手术室原有库房进行整体改造及屏蔽铺设,搭建成基于RFID的手术室耗材智慧屋管理系统,建立产品入库、使用登记、库存管理和查询4个模块,完成对高值耗材的全过程管理和可追溯管理。比较系统使用前后耗材管理不良事件发生率、日均管理时间、日均领用时间和领用次数以及未使用耗材归位率情况。结果系统使用后,耗材管理不良事件发生率为2.9%,显著低于系统使用前的8.8%(χ^(2)=31.601,P<0.001);耗材日均管理时间为(66.56±10.37)min,显著低于使用前(110.18±16.89)min(t=69.598,P<0.001);耗材日均领用时间和领用次数显著低于使用前(t=109.051、39.659,均P<0.001)。未使用耗材归位率由系统使用前的95.2%提高到使用后的100%。结论手术室耗材智慧屋管理系统在高值耗材管理中应用效果显著,可减少耗材管理不良事件的发生,精简耗材管理和领用环节,值得推广应用。
