How to attach created php excel to another function - php

Question

I need to pass the gerenrated PHPExcel output to a function that will send it via Email. My current code is this:
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
//Send Email here
$this->ciEngine->load->library( 'Services\Notifications\PushReports\Survey\Email' );
$emailResult = $this->ciEngine->Email->emailSurvey();
**UPDATE
I'm adding the emailSurvey's code for reference.
namespace Services\Notifications\PushReports\Survey;
use \Services\ServiceBase;
class Email
extends ServiceBase
{
public function emailSurvey( $countryConfig, $appointment )
{
if( empty( $appointment ) ) {
return false;
}
$this->ciEngine->load->library( 'email' );
$receipient = $this->ciEngine->config->config['push-report-receipient'];
$sender = $this->ciEngine->config->config['push-report-sender'];
if( !empty($receipient) && !empty($sender) ){
$this->ciEngine->email->initialize( $this->ciEngine->config->config );
$this->ciEngine->email->from( $sender );
$this->ciEngine->email->to( $receipient );
$this->ciEngine->email->subject( $this->ciEngine->config->config['push-report-subject'] );
ob_start();
$this->ciEngine->load->view( 'emails/surveyPush' );
$mailBody = ob_get_contents();
ob_end_clean();
$this->ciEngine->email->message( $mailBody );
return $this->ciEngine->email->send();
}
}
}
How could I pass it to the emailSurvey function?