Model_Name

public function __construct($var)

$var

Model::factory('Name', $var)

Model::factory('Name', array('var' => $var)

new Model_Name($var)

abstract class Kohana_Model
{
    /**
     * Create a new model instance.
     * There can passed more than one arguments, and all of them will be passed
     * to a models constructor.
     *
     *     $model = Model::factory($name, ...);
     *
     * @param   string   model name
     * @return  Model
     */
    public static function factory( $name )
    {
        # Load the model using reflection
        $class = new ReflectionClass('Model_'.$name);

        # Get all arguments
        $args = func_get_args();

        # Remove first element, cause it is a model name
        array_shift($args);

        # Create a new instance of the model
        $model = $class->newInstance($args);

        return $model;

    }
}

Model::factory('ModelName', array($arg1 => 'arg1',...)

Model::factory('ModelName', $arg1, $arg2,...)