The FDA has released a notice of recall of Ventlab brand manual resuscitators due to a possibility the duckbill valve will stick. Thish can lead to complications including hypoxia in patients when the bag is used. Only a limited number of bags were affected, primarily those designed for pediatric use.
If you have a Ventlab brand resuscitator in your office, contact the manufacturer to see if your bag is affected by the recall. They also have a full list of affected serial numbers and dates of manufacture available.
For additional information, you can see the FDA's announcement here.