| 摘要 |
The present invention relates to intravenous catheter insertion devices which employ a sharp needle to introduce and emplace an intravenous catheter into a body vessel of a patient. The sharp needle end is positioned to extend from within the catheter such that the needle and catheter can be introduced into the body vessel which is pierced by the sharp needle. Following use of the present intravenous catheter insertion device to introduce and emplace an intravenous catheter into a patient's body vessel, the needle is withdrawn from within the catheter and the device is separated from the catheter such that only the catheter remains within the body vessel. The safety intravenous catheter insertion device of the present invention comprises self-contained coupling means for preventing separation of the catheter from the device until the needle is substantially transposed into a safety receptacle to thereby permit the used needle to be safely handled and discarded. It is preferred to provide a self-contained safety intravenous catheter insertion device having automatic needle transposal means and it is especially preferred to have automatic transposal means triggered by manipulations related to catheter placement, i.e., positioning of the catheter at a selected position relative to the needle. The selected relative catheter position is preferably when the entire catheter is positioned just beyond or nearly beyond the needle point. In this manner, transposition of the needle into the safety receptacle occurs automatically when the catheter is placed in the selected position, and placement of the catheter in the selected position occurs during withdrawal of the needle from within the emplaced catheter thereby permitting the needle to remain within the catheter during emplacement to thereby facilitate guiding and maneuvering of the catheter to the desired emplacement position.
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