Plans from a Hudson-based medical device distributor to build a 300,000 square foot facility and add at least 500 jobs in the community have been withdrawn by the applicant, however, that does not mean it’s abandoning Merrimack. The company’s engineer submitted a letter withdrawing the plans on Jan. 31, ahead of their scheduled site plan review on Tuesday night. According to Community Development Director Tim Thompson, Atrium Medical Corp.'s plan to build on Robert Milligan Parkway next to Camper’s Inn has been pulled in accordance with corporate policy of the Swedish company that acquired Atrium back in October.