Tandem issued a voluntary recall of some lots of insulin cartridges used for its t:slim Insulin Pump out of concern that the cartridges might leak.  The company warns that the affected cartridges could provide too much or too little insulin, and customers should not use them.

The lots in question, which contained 10 cartridges each, were sold on or around December 17th, 2013.  Tandem estimates there are some 4,746 affected cartridges affected. Here is a list of the affected lot numbers: