| 主权项 |
1. A catheter assembly comprising:
a catheter hub with a catheter tube having a tube end, said catheter hub comprising a body comprising an interior surface defining an interior cavity comprising a first inside diameter section distal of a second inside diameter section and wherein said first inside diameter section is larger in dimension than said second inside diameter section; a needle hub with a needle having a needle tip, a nominal needle diameter, and a needle shaft projecting through the catheter hub and the catheter tube such that the needle tip extends distally of the tube end in a ready position; an elastic seal held against a shoulder in the interior cavity of the catheter hub, said elastic seal comprising an outside diameter and an inside diameter and wherein said inside diameter being sufficiently larger than the nominal needle diameter so that the needle shaft does not come in contact with the inside diameter of the elastic seal in the ready position; a needle guard for covering the needle tip in a protective position located in the interior cavity of the catheter hub and in contact with the elastic seal; a temporary seal for limiting fluid flow formed at a point where the needle guard contacts the elastic seal. |
