A drug delivery device includes a blunt cannula and a reservoir. The blunt cannula has a cylindrical wall that defines an axial passage between a first end and a second end of the blunt cannula. The wall has at least a first tapered region at the first end to define an opening in fluid communication with the axial passage and adapted at the first end to resist interruption of fluid flow through the axial passage and out of the first end of the blunt cannula. The reservoir is connected to the second end of the blunt cannula

An apparatus and method directionally administers at least one medication directly onto livestock while also monitoring the effect of the medication and tracking the movement and orientation of the livestock. The apparatus periodically administers the medication at a predetermined dosage. The apparatus also tracks the position and orientation of the livestock as an indication of whether the medication is effective. A solar cell provides renewable energy for powering the apparatus. A dispenser directionally and topically sprays medication on the wither area of the livestock. The medication is stored in at least one reservoir. A tracking portion tracks the position of the livestock in a predetermined range. The orientation of the livestock is also determined. The apparatus can be controlled directly from a control portion, or remotely from a remote processor. The apparatus minimize time and costs for managing livestock, especially over large areas and large numbers of livestock.

A drug delivery device includes a blunt cannula and a reservoir. The blunt cannula has a cylindrical wall that defines an axial passage between a first end and a second end of the blunt cannula. The wall has at least a first tapered region at the first end to define an opening in fluid communication with the axial passage and adapted at the first end to resist interruption of fluid flow through the axial passage and out of the first end of the blunt cannula. The reservoir is connected to the second end of the blunt cannula.

The invention provides a microfluidic device (1) for jet ejection, wherein the microfluidic device (1) comprises a hosting chamber (100) defined by a chamber wall (110), wherein the hosting chamber (100) is configured to host a liquid (10), wherein along a device axis of elongation (A.sub.D) the hosting chamber (100) has a chamber length (L.sub.C) defined by a first chamber end (101) and a second chamber end (102), wherein the first chamber end (101) comprises a first chamber opening (1011) for jet ejection from the hosting chamber (100); wherein the chamber wall (110) comprises a pattern (300) of a first surface material (111) and a second surface material (112), wherein the first surface material (111) has an equilibrium contact angle .sub.1>90 for the liquid (10), and wherein the second surface material (112) has an equilibrium contact angle .sub.2 for the liquid (10), wherein .sub.1.sub.220; wherein the pattern (300) comprises a patch (200), wherein the patch has a patch boundary (205), and wherein (a) the patch (200) comprises one of the first surface material (111) and the second surface material (112), and wherein (b) at least 50% of the patch boundary (205) contacts the other of the first surface material (111) and the second surface material (112); wherein the chamber wall (110) has a wall surface area (S.sub.W), wherein the patch (200) has a patch surface area (S.sub.P), wherein 10.sup.4S.sub.P/S.sub.W2*10.sup.1.