| 摘要 |
A catheterization system for embedment in a patient includes a sharp edged needle at the proximal end portion of the catheter. A protective sheath is received about the needle for relative slidable movement thereon between a first position wherein the sharp edge of the needle extends beyond the protective sheath and a second position wherein the blunt leading proximal edge of the protective sheath extends beyond and covers the sharp edge of the needle.
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