Create a controller that extends the base controller then in you application use it instead of the CI_Controller
class MY_Controller extends CI_Controller {
//code comes here thats universal rather all other controllers will work with especially your data handling objects
//this file will be saved in core folder (CI version 2.x)
}
In your ordinary controller
class Myaccount extends My_Controller {
//Your methods come here.
//Note the controller being extended
}
Hope that was helpful