Double-wall endotracheal cuff

Claim 1

AN ENDOTRACHEAL CUFF FOR INTRODUCING INTO THE TRACHEA COMPRISING A TUBULAR BASE MEMBER, A TUBULAR OUTER CUFF MEMBER TO DISTENSIBLE MATERIAL SECURED TO ITS OPPOSITE ENDS TO SAID BASE MEMBER, AN IMPERFORATE INNER TUBULAR CUFF MEMBER OF DISTENSIBLE MATERIAL BETWEEN SAID OUTER CUFF MEMBER AND SAID BASE MEMBER AND SECURED AT ITS OPPOSITE ENDS TO SAID BASE MEMBER, THE WALL OF SAID OUTER CUFF MEMBER BEING FORMED WITH SPACED PERFORATIONS, PASSAGE MEANS COMMUNICATING WITH THE SPACE BETWEEN SAID INNER CUFF MEMBER AND SAID BASE MEMBER FOR INFLATING SAID INNER CUFF MEMBER TO BRING WALL PORTIONS THEREOF INTO A REGULATED EXTENT OF CONTACT WITH OPPOSED WALL PORTIONS OF SAID OUTER CUFF MEMBER WHEREBY THE WALL OF SAID OUTER CUFF MEMBER IS BROUGHT SELECTIVELY INTO POSITIONS IN SPACED OR SEALING RELATION TO OPPOSED PORTIONS OF THE TRACHEA, AND PASSAGE MEANS COMMUNICATING WITH THE SPACE BETWEEN SAID CUFF MEMBERS FOR INTRODUCING ANESTHETIC FLUID THEREIN FOR REGULATED TRANSMISSION OUTWARDLY THROUGH THE PERFORATIONS IN SAID OUTER CUFF MEMBER INTO CONTACT WITH SELECTED PORTIONS OF THE TRACHEA.