We have had a number of reports in last month related to Embecta insulin pen safety needles detaching or retracting before administration and coming apart. Upon investigation it seems like the threads on the insulin aspart pen barrels/tips are stripping. The needles can spin endlessly on the pen vs. lock/click in place. The aspart pen threads do not go all the way around the pen like insulin glargine or NPH; instead, there are flat areas which I think allows the pen needle threads to keep spinning and eventually strip. If a user pushes the pen and needle together in attempt to tighten it before/during twisting together, this additional pressure while spinning seems to activate the needle. We are told there have been no changes in manufacturing of the needles; these are the only retracting safety needles on the market. We are awaiting feedback from Novo Nordisk on the pen threading. I've reported to ISMP/ECRI as well.

Have any other institutions that use insulin aspart insulin pens and Embecta safety needles experiences this issue?