Drug Delivery Device with Dual Layer Spring

摘要

The present invention relates to a drug delivery device (1, 100) comprising a drug expelling mechanism and a spring (10, 110) releasable during use of the drug delivery device (1,100) to convey stored energy to the drug expelling mechanism. The spring (10, 110) comprises a first helical portion (11, 111) and a second helical portion (13, 113) surrounding at least a portion of the first helical portion (11, 111).

主权项

1. A drug delivery device comprising a drug expelling mechanism and a spring releasable during use of the drug delivery device to convey stored energy to the drug expelling mechanism, wherein the spring comprises a first helical portion and a second helical portion wound about at least a portion of the first helical portion, and wherein the first helical portion and the second helical portion form one continuous piece.