Martin Krite and Martin Stromberg, two of Groupama's on-board medics, took him below deck to treat him.
"When Brad came down the rig we realised something was wrong," said Krite. "There was quite a bit of blood coming down from the rig and we could see from Brad's eyes that he was in shock.
"After talking to our team doctor we decided to staple him together. We took out the staple gun and put five staples in him and now he's as good as new, I think."
Groupama completed leg 5 last night with 20 points for third place, ensuring they remain in contention for the overall prize.
The French boat leapfrogged leg 5 winners Puma into second place overall, 20 points behind Telefonica, who are facing a hearing into allegations they carried an extra sail on leg 4 into Auckland.
With the French boat wrapping up third place, Team New Zealand's entry Camper are the only boat still remaining in the race to Itajai, with Team Sanya and Abu Dhabi Ocean Racing having withdrawn from the leg.
The Camper crew are making steady progress towards Cape Horn after a six-day stopover in Chile to repair damage to their hull.
For much of yesterday, Camper were averaging speeds of around 20 knots in a 20-25 knot north-westerly breeze.
The team are expected to round Cape Horn today as they race to stay ahead of a strong low pressure system, which is developing behind them.
If they can beat the system a fast trip to Itajai should be ensured with an estimated time of arrival of April 16.