作者: Tatsuo Suzuki
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摘要: In general, the confirmation of a puncture in blood vessel is made through visual check flush back from into needle assembly. The conventional assembly incorporates membrane filter permeable to air but impermeable blood, order prevent flooding outside. needle, however, cannot be used suitably for deep tissue. invention, an relief opening formed portion hub, catheter hub or end plug attachable catheter, other than which constitutes pressing surface on thumb user placed exert thrust force puncturing tissue and vessel, as case ordinary syringes. relieved opening, thus permit smooth blood.