| 摘要 |
The invention provides a self-retaining needle assembly comprising a hollow outer needle (2), an outer needle hub (3) that is provided at the basal end of said outer needle and which has a bore communicating with the interior of said outer needle, an inner needle (4) to be passed through said outer needle, an inner needle hub (5) provided at the basal end of said inner needle, and a valve element (7) provided in the bore of said outer needle hub to plug said bore. The valve element (7) is a reversible valve element made of an elastic material that has a hole through which said inner needle can be passed. The assembly prevents the liquid leakage due to time-dependent deterioration and facilitates the injection of the blood and other fluids. The invention also provides a reversible element made of an elastic material that has a hole through which a tubular or rod member can be passed. The valve element also prevents the liquid leakage due to time-dependent deterioration. <IMAGE> |
