WSJ.com -Doctors have continued reporting injuries during the implantation of cardiac stents made by Boston Scientific Corp., many of them linked to a problem that preceded a voluntary temporary recall of the devices last year.

Balloons used to deploy the stents -- small, wire-mesh tubes inserted into clogged arteries to open them up -- failed to deflate or were so hard to remove that three people died and dozens more were injured during operations performed after the 2004 recall, according to Food and Drug Administration records.