A tracheostomy valve for use in conjunction with a tracheostomy tube is described. The tracheostomy valve comprises a housing and a one-way valve. The housing has an aperture including a forward and rear opening defined therethrough. The housing also includes a rear portion proximate the rear opening...http://www.google.ca/patents/US5392775?utm_source=gb-gplus-sharePatent US5392775 - Duckbill valve for a tracheostomy tube that permits speech
