Patent ID: 8167844
Filing Date: 2012-05-01
Classification: A61M,F16F

Abstract:
1. A safety intravenous catheter placement device having: a) a cylindrical body, b) a hollow needle attached to the cylindrical body, c) an intravenous delivery catheter removeably located coaxially over the needle such that the needle can be withdrawn from the catheter after a delivery end of the catheter is placed for delivery of intravenous fluid, d) a reciprocal tubular needle sheath disposed on the exterior of the cylindrical body, and e) a spring engaging the cylindrical body and the sheath and expandable to move the sheath to cover a point on the needle, wherein the spring is a non-uniform helical spring having multiple 360° turns each turn uniformly spaced from adjacent turns, each 360° turn comprising alternating angled portions and flat portions, the angled portions being at an angle to a plane perpendicular to an axis through the center of the helical spring and the flat portions being substantially parallel to the plane perpendicular to the axis.