A team of lawyers from the Atlanta firm Welch Spell had to log tens of thousands of airplane miles to help a Danish company expand into the still-fertile business of selling penile implants.

Since December, a Welch Spell team led by partners Laurance D. Pless, James A. Tramonte and Robert A. Sauro represented Coloplast A/S in its agreement to purchase two business lines from Mentor Corp. for $463 million. The transaction was extremely complicated, with more than a dozen lawyers involved on both sides, dealing with a host of issues, Pless said.