Endobronchial Watanabe Spigots (EWS®) were developed by NOVATECH in close cooperation with Dr. Y. Watanabe, Okayama, Japan. They are made of implant-grade silicone (implantable for more than 29 days), radio-opaque, sterile and blister-packed (3 EWS per blister).
For re-expansion of the lung in case of:
A study performed in Japan with 63 patients including 40 cases of intractable pneumothorax, 12 cases of pyothorax with fistula and 7 cases of pulmonary fistula has shown that using EWS® is safer and has more permanent results than conventional methods.
After determination of the affected bronchi with a balloon catheter (alternatively X-ray etc.), the EWS® are placed with a flexible bronchoscope and forceps guided by the working tube of the bronchoscope. The use of EWS® was successful in 96.7% of the cases.
The loss of air was stopped or significantly reduced in 77.6% of the cases. No severe complications occurred.