US Patent 7744567 Reducing withdrawal force in a safety IV catheter

An extravascular system for accessing the vasculature of a patient may include a catheter adapter, a needle, and/or a needle tip shield assembly. The needle tip shield assembly may have a needle cap, and the needle cap may have a needle shield and at least one low friction surface. The needle may be disposed within the catheter assembly and the needle tip shield assembly. The low friction surface may reside between the needle shield and the needle. The at least one low friction surface may reside on the needle, on the V-clip, and/or on a structure located between the needle and the V-clip.