Arced Hypodermic Needle
A hypodermic needle for delivering a bolus of a pharmaceutically active agent to the posterior chamber of the eye having a lancet disposed at the distal tip and a lumen disposed along a longitudinal axis within. The lancet may be formed by an angled linear cut coming to a point at the distal tip of the needle, or an arc-shaped cut beginning at the needle tip parallel to the longitudinal axis and gradually arcing upward to roughly perpendicular to the longitudinal axis. Additionally, cuts, grooves, channels, or teeth may be added to the surface of the lancet in a regular or irregular pattern for the purpose of increasing surface tension on the drug bolus.
1 . A hypodermic needle comprising:
a cannula disposed along a longitudinal axis;
a lancet disposed at a distal end of said cannula, the lancet generally parallel to said longitudinal axis, the lancet having a generally curved profile;
a lumen disposed within said cannula generally parallel to said longitudinal axis; and
a plurality of channels disposed on a surface of said lancet, the plurality of channels disposed generally perpendicular to said longitudinal axis.
2 . The needle of claim 1 wherein said cannula further comprises an oblong shaped orifice disposed on a surface of said lancet.
2 . The needle of claim 1 wherein at least one of said channels has a semi-circular cross section.
3 . The needle of claim 1 wherein at least one of said channels has a triangular cross section.
4 . The needle of claim 1 wherein at least one of said channels has a rectangular cross section.
5 . The needle of claim 1 wherein said channels are disposed at regular intervals.
6 . The needle of claim 1 wherein said channels are disposed at irregular intervals.
7 . The needle of claim 1 wherein said channels provide surface tension on a substance to cause the substance to form a sphere or sphere like shape.
8 . The needle of claim 1 wherein said curved profile of said lancet provides surface tension on a substance to cause the substance to form a sphere or sphere like shape.
9 . The needle of claim 1 wherein said cannula is in the range of 25 to 30 gauge.
10 . A hypodermic needle comprising:
a cannula disposed along a longitudinal axis;
a lancet disposed at a distal end of said cannula, the lancet generally parallel to said longitudinal axis, the lancet having a generally curved profile such that an opening at the distal end of said cannula is generally teardrop shaped;
a lumen disposed within said cannula generally parallel to said longitudinal axis; and
a plurality of channels disposed on a surface of said lancet, said plurality of channels disposed generally perpendicular to said longitudinal axis, at least one of said channels having a semi-circular cross section.
11 . The needle of claim 10 wherein said channels are disposed at regular intervals.
12 . The needle of claim 10 wherein said channels are disposed at irregular intervals.
13 . The needle of claim 10 wherein said cannula is in the range of 25 to 30 gauge.
14 . A hypodermic needle comprising:
a cannula disposed along a longitudinal axis;
a lancet disposed at a distal end of said cannula, the lancet generally parallel to said longitudinal axis, the lancet having a generally curved profile such that an opening at the distal end of said cannula is generally teardrop shaped;
a lumen disposed within said cannula generally parallel to said longitudinal axis; and
a plurality of channels disposed on a surface of said lancet, said plurality of channels disposed generally perpendicular to said longitudinal axis, at least one of said channels having a triangular cross section.
15 . The needle of claim 14 wherein said channels are disposed at regular intervals.
16 . The needle of claim 14 wherein said channels are disposed at irregular intervals.
17 . The needle of claim 14 wherein said cannula is in the range of 25 to 30 gauge.
18 . A hypodermic needle comprising:
a cannula disposed along a longitudinal axis;
a lancet disposed at a distal end of said cannula, the lancet generally parallel to said longitudinal axis, the lancet having a generally curved profile such that an opening at the distal end of said cannula is generally teardrop shaped;
a lumen disposed within said cannula generally parallel to said longitudinal axis; and
a plurality of channels disposed on a surface of said lancet, said plurality of channels disposed generally perpendicular to said longitudinal axis, at least one of said channels having a rectangular cross section.
19 . The needle of claim 18 wherein said channels are disposed at regular intervals.
20 . The needle of claim 18 wherein said channels are disposed at irregular intervals.