Pen needle tip and method of making and using the same

A needle tip assembly for a pre-loaded syringe or a pen needle injection device, the needle tip assembly comprising:

• a needle mounted to a needle support and comprising a first puncturing end projecting from a front side of the needle support and a second puncturing end projecting from a rear side of the needle support, wherein the needle support is arranged as an outer cylindrical body having a front end, wherein the front end is configured with at least two deflectable arms integrally formed with the needle support, the at least two deflectable arms having locking projections integrally formed on a distal end of each deflectable arm;
• a single-piece body sized and configured to receive therein the needle support and the needle, the body comprising:
• a front portion having an inside locking recess configured to engage with the locking projections on the end of each deflectable arm;
• a rear portion around the second puncturing end of the needle;
• and
• an overall axial length that is greater than an axial length of the needle,
• wherein the body is axially movable relative to the needle support,
• wherein, prior to the needle tip assembly being in an installed condition on the pre-loaded syringe or the pen needle injection device, each of:
• the front portion covers the first puncturing end;
• and
• the rear portion covers the second puncturing end, and
• wherein, prior to removal from the pre-loaded syringe or the pen needle injection device, the body is at least axially movable relative to the needle support to a position where the front portion covers the first puncturing end, and wherein during removal of the pre-loaded syringe or the pen needle injection device, the locking projections are locked into the locking recess, thereby rendering the needle tip assembly for a single use.