TIP CAP AND INJECTION DEVICE WITH DISTAL TIP TIGHTLY CLOSED BY TIP CAP Russian patent published in 2017 - IPC A61M5/31 

FIELD: medicine.

SUBSTANCE: tip cap comprises the following: a closed distal end portion having a substantially transverse proximal surface; a peripheral skirt extending proximally from the said proximal surface, the said peripheral skirt having an inner surface adapted to interact with the outer surface of the injection device tip; a connecting protrusion protruding from the proximal surface of the distal end portion in the proximal direction and configured to engage the injection device tip. The tip cap inner cavity is formed such that: the outer fillet has a curvature radius of 0.4 to 0.6 mm; the inner fillet has a curvature radius of 0.25 to 0.35 mm; the width of the connecting protrusion base is from 1.4 to 1.6 mm; the domed proximal portion of the connecting protrusion has a curvature radius of 0.55 to 0.70 mm.

EFFECT: improvement of the sealing interaction between the cap and the tip of the injection device.

11 cl, 19 dwg, 1 tbl