(Images courtesy of Dr. Miguel Morales Garcia . Hospital Rey Juan Carlos . Móstoles. Madrid. Spain.)
The thoracic vent is a minimally invasive device for the treatment of spontaneous and iatrogenic pneumothorax. It consists of a catheter connected to a plastic chamber containing a one-way valve designed to maximize air exit and eliminate the possibility ofits reentry. There is no need to connect the thoracic vent to an underwater seal device.
Another device similar to the thoracic vent is a small bore catheter with Heimlich valve (see link below).
To thoracic vent picture : img02.jpg
To Heimlich Valve: Heimlich Valve for Treatment of Pneumothorax)