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Stevanato Group Special Thin-Wall (sTW) needle, is a 27G and 29G ½” 5B needle with an enlarged internal channel diameter to optimize the delivery of highly viscous drug formulations without the need for bigger needles, thereby satisfying auto-injector device requirements and enhancing the overall patient experience.
Available in 27 gauge and 29 gauge, the ½” needle with five-bevels tip is manufactured with AISI 304 stainless steel and has been designed to meet the requirements of Nexa® and Alba® performance levels in terms of dimension, cosmetics, penetration and breakage resistance. sTW Needles are currently applicable to 1ml long and 2.25ml syringe formats.
The sTW needle with its larger internal diameter, but standard 27G and 29G external dimensions, improves the time and force required for the injection of highly viscous solutions, avoiding the use of larger needles, and granting an optimized patient experience. The sTW needle also guarantees an excellent gliding performance for both manual and auto-injector applications as a result of its optimized internal dimension.
To analyze the comparative performance of the special Thin-Wall (sTW) needle against standard Thin-Wall (TW) needles, a series of tests were undertaken in-house, in our Technology Excellence Center.
As shown in the graphs, the sTW needle registers an improved gliding force compared to the standard thin-wall needle as the viscosity of the solution increases, thus confirming that the sTW needle optimizes the delivery of highly viscous drug formulations avoiding the use of bigger needles.
