Safety IV needle/cannula introducer
First Claim
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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body,c) an intravenous delivery catheter removeably located coaxially over the needle such that the needle can be withdrawn from the catheter after a delivery end of the catheter is placed for delivery of intravenous fluid,d) a reciprocal tubular needle sheath disposed on the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, ande) 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.
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Abstract
An improved safety IV placement device includes a reciprocal tubular needle sheath disposed on the exterior of the syringe body and a latch mechanism engaging the syringe body and the sheath to latch the sheath in a needle-covering position after placement of the IV cannula and removal of the needle from within the cannula. An internal spring, which engages the sheath, expands to move the sheath to cover the needle point prior to placement of the IV cannula and after the needle is removed from the indwelling cannula. The spring is a non-uniform helical spring having multiple 360 turns each turn uniformly spaced from adjacent turns.
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Citations
14 Claims
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1. A safety intravenous catheter placement device having:
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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body, c) an intravenous delivery catheter removeably located coaxially over the needle such that the needle can be withdrawn from the catheter after a delivery end of the catheter is placed for delivery of intravenous fluid, d) a reciprocal tubular needle sheath disposed on the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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A safety intravenous catheter placement device having:
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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 and wherein each 360°
turn of the helical spring has a first and second angled portion alternating with a first and second flat portion. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification