Voice prosthesis
A voice prosthesis to be mounted in a fistula between trachea and esophagus comprises a spool-shaped element with a through passage and a valve mechanism controlling the connection through said passage and having sealing surfaces which can be pressed against each other, means being provided to produce a magnet force acting between the sealing surfaces to keep said surfaces pressed against each other in the closed position of the valve mechanism.
1. A voice prosthesis comprising:
a spool-shaped hollow body for insertion into a fistula in a tracheoesophageal wall of a patient, said body having an open tracheal end an open esophageal end;
a first retention flange at said tracheal end of said body;
a second retention flange at said esophageal end of said body, said body defining a through passage between said tracheal end and said esophageal end;
a valve seat formed by said body at said esophageal end thereof;
a valve flap cooperating with said valve seat to control air flow through said through passage of said body, said valve flap occluding air flow through said through passage in a closed position of said valve flap against said valve seat;
a permanently magnetically attracted material disposed on an opposed one of said valve flap and said valve seat, said magnet and said magnetically attracted material providing a magnet force between said valve flap and said valve seat in said closed position of said valve flap; and
a permanent magnet on one of the valve flap and valve seat, providing a permanent magnetic force on said permanently magnetically attracted material;
seating surfaces formed by said valve flap and said valve seat, respectively, to be pressed against each other by a magnetic force in said closed position, said magnet force normally maintaining said valve flap in sealing engagement with said valve seat in said closed position to be disengaged therefrom by an overpressure in trachea overcoming said magnet force.
2. A voice prosthesis, according to claim 1 , wherein said at least one of said magnet and said magnetically attracted material is a permanent magnet.
3. A voice prosthesis, according to claim 2 , wherein said magnet is a permanent magnet.
4. A voice prosthesis, according to claim 1 , wherein said at least one of said magnet and said magnetically attracted material is an electromagnet.
5. A voice prosthesis, according to claim 4 , wherein said magnet is an electromagnet.
6. A voice prosthesis, according to claim 1 , wherein said at least one of said magnet and said magnetically attracted material are secured by gluing.
7. A voice prosthesis, according to claim 1 , wherein said at least one of said magnet and said magnetically attracted material are secured by molding.
8. A voice prosthesis, according to claim 1 , wherein said at least one of said magnet and said magnetically attracted material are coated with a surface layer of a corrosion resistant material.
9. A voice prosthesis, according to claim 1 , wherein at least one of said sealing surfaces is a candida resistant material.
10. A voice prosthesis, according to claim 9 , wherein one sealing surface of said candida resistant material is formed as a valve seat which extends axially on at least one side of said valve seat as a lining of said through passage in said spool-shaped hollow body.