A man who alleges Chicago police denied his repeated requests for medical care after he was arrested in a “road rage” incident got the go-ahead to pursue a Fourth Amendment claim.In a written opinion last week, U.S. District Judge Harry D. Leinenweber did not rule on the merits of David Michon’s allegations that officers mocked and threatened him when he asked to be treated for a torn ligament on his right knee and cuts on his head and face.But Leinenweber held Michon had stated a claim that the officers …