jesseterry/Codeigniter-CRUD-Model — pull request #1 by onefriendaday (2013-07-25 16:20:17+00:00)
Title: Gets uri segment variable working

To get the uri_segment working you need to define it in the config array. then this will works:
$this->pgn_model->paginate('model/index'), $page, 4);
where 4 is the uri_segment