How to Use CodeIgniter Global Functions (e.g., helper(), model()) Inside Custom "Mana

Hi everyone,
I'm working on a project where I'm using an MVCM (Model-View-Controller-Manager) pattern. Here's how I’ve structured it:

• Model: Represents the database table.
  
• Entity: Represents a single row of the table.
  
• Manager: Contains the business logic that coordinates between models and entities.
  
• Controller: Talks to the Manager, which then handles the lower-level details.
  

I've created a Managers directory inside app/ , and I intend for my controllers to interact only with Managers — not directly with Models or Entities.
The issue: inside the Manager classes, I’m unable to use common global functions like helper(), model(), etc., that work seamlessly in Controllers.

Question:
Is there a way to make these global CodeIgniter functions available inside my custom Managers classes, just like they are in Controllers?

Thanks in advance!