ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,721,946, issued on Sept. 1, was assigned to INSULET Corp. (Acton, Mass.).

"Pleated expandable reservoir for a wearable drug delivery device" was invented by Maureen Mccaffrey (Arlington, Mass.) and Daniel Allis (Boxford, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein are various embodiments providing an expandable, flexible reservoir for use in a wearable drug delivery device. The reservoir comprises a flexible enclosure made with plastic film which incorporates pleats forming the side walls thereof to increase the volume efficiency and to avoid a "pillowing" effect when the reservoir is filled. The pleats may be formed at non-rig...