Passing an object to the view in CodeIgniter

I'm trying to use an object and persist it into the data base.

I created a class in the library's folder.

<?php  
if (!defined('BASEPATH')) exit('No direct script access allowed');

class Solicitud {

    private $categoria;
    private $consecutivo;
    private $id;
    private $mensaje;
    private $solicitante;


    function __construct(){
        $this->categoria = 1;
        $this->consecutivo = 1;
        $this->mensaje = "Mensaje por defecto";
    }

    public function escalarSolicitud( User $actual, User $nuevo){
        $this->setSolicitante($nuevo);
    }

    # Getters and Setters

    public function setCategoria( $categoria ){
        $this->categoria = $categoria; 
    }

    public function getCategoria(){
        return $this->categoria;
    }    

Here is the Controller:

<?php

if (!defined('BASEPATH')) exit('No direct script access allowed');

class Administrador extends Ci_Controller {

    function __construct(){ 
        parent::__construct();
    }

    public function crearSolicitud(){

        $session_data = $this->session->userdata('session_user');   
        $usuario      = $session_data['usuario']; 
        $categoria    = $this->input->post('category');
        $mensaje      = $this->input->post('description');

        $solicitud = new solicitud;

        $solicitud->setSolicitante($user);
        $solicitud->setCategoria($categoria);
        $solicitud->setMensaje($mensaje);

        $this->helpdesk_model->createSupport( $solicitud );
    }

And in the Model how can I use the object properties:

public function createSupport( $soporte ){

    $this->db->trans_start();

        $data = array(
            'id' => null,  
            'id_user' => $soporte[usuario], ???
            'id_category' => $soporte[categoria], ???
            'message' => $soporte[mensaje] ???
        ); 

        $this->db->insert('supports', $data); 

    $this->db->trans_complete();

    return $this->db->trans_status(); 

}

I need to know if I'm in the right direction or if the use of the 'Solicitud' class is not necessary. If I'm right, how should I call in the model the object attributes?