Accidentally swallowed foreign objects are not uncommon but difficult to manage without complications. We describe the case of a 68 year old man who accidentally a swallowed sharp-pointed dental reamer that had reache...Accidentally swallowed foreign objects are not uncommon but difficult to manage without complications. We describe the case of a 68 year old man who accidentally a swallowed sharp-pointed dental reamer that had reached deep in his jejunum. Double balloon enteroscopic retrieval was performed with polypectomy snare but the reamer was entangled in the wire loop of the snare and penetrated the jejunal wall. After releasing the reamer by pushing and pulling the snare for approximately 30 min, the reamer was retrieved with biopsy forceps. This is the first report of double balloon enteroscopic removal of a dental reamer. Furthermore, this is a novel case with regard to decision making in situations when sharp objects are swallowed.展开更多
By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle f...By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.展开更多
针对煤矿松软破碎软岩巷道采用锚杆支护时锚固力普遍偏低、达不到设计要求的问题,开发了煤矿软岩钻孔顶部扩孔钻头,并分别在实验室和煤矿井下现场进行了扩孔效果和扩孔锚固性能对比试验。试验结果表明:新研制的扩孔钻头在扩孔段扩孔直...针对煤矿松软破碎软岩巷道采用锚杆支护时锚固力普遍偏低、达不到设计要求的问题,开发了煤矿软岩钻孔顶部扩孔钻头,并分别在实验室和煤矿井下现场进行了扩孔效果和扩孔锚固性能对比试验。试验结果表明:新研制的扩孔钻头在扩孔段扩孔直径比普通钻孔直径大5.3 mm左右,煤矿井下100 mm短锚固拉拔对比试验时,扩孔钻孔锚杆最大锚固力达112.3 k N,为普通钻孔锚固力的1.55倍。并且在树脂锚固剂和钻孔煤岩壁之间发生脱锚后,良好的机械摩擦阻力使锚杆锚固力一直保持基本不变,充分反映了软岩扩孔锚固的良好效果。展开更多
文摘Accidentally swallowed foreign objects are not uncommon but difficult to manage without complications. We describe the case of a 68 year old man who accidentally a swallowed sharp-pointed dental reamer that had reached deep in his jejunum. Double balloon enteroscopic retrieval was performed with polypectomy snare but the reamer was entangled in the wire loop of the snare and penetrated the jejunal wall. After releasing the reamer by pushing and pulling the snare for approximately 30 min, the reamer was retrieved with biopsy forceps. This is the first report of double balloon enteroscopic removal of a dental reamer. Furthermore, this is a novel case with regard to decision making in situations when sharp objects are swallowed.
文摘By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.
文摘针对煤矿松软破碎软岩巷道采用锚杆支护时锚固力普遍偏低、达不到设计要求的问题,开发了煤矿软岩钻孔顶部扩孔钻头,并分别在实验室和煤矿井下现场进行了扩孔效果和扩孔锚固性能对比试验。试验结果表明:新研制的扩孔钻头在扩孔段扩孔直径比普通钻孔直径大5.3 mm左右,煤矿井下100 mm短锚固拉拔对比试验时,扩孔钻孔锚杆最大锚固力达112.3 k N,为普通钻孔锚固力的1.55倍。并且在树脂锚固剂和钻孔煤岩壁之间发生脱锚后,良好的机械摩擦阻力使锚杆锚固力一直保持基本不变,充分反映了软岩扩孔锚固的良好效果。
