Patent ID: 8144910

Claim:
A composite receiver tube for conveying the output of a hearing instrument receiver in a hearing instrument to a user's ear canal, the hearing instrument comprising a shell, the shell comprising a wall, comprising: a tube connected to the user's ear canal, the tube passing through the wall of the shell; and an insulator positioned between the tube and the receiver, the insulator comprising a surface for mating with the tube; a surface for mating with the receiver; an outer surface between the surface for mating with the tube and the surface for mating with the receiver, and comprising a flared section adjacent the surface for mating with the receiver that widens towards the surface for mating with the receiver; and an internal surface comprising an internal sound channel connecting the tube with the receiver, the internal sound channel extending from the surface for mating with the tube to the surface for mating with the receiver and comprising a narrow, inner dimension adjacent the surface for mating with the tube; a wider, inner dimension adjacent the surface for mating with the receiver; and a flared, inner contour adjacent and widening towards the surface for mating with the receiver.