Ear tubes
The invention provides a flexible ear tube ( 10 ) for draining and ventilating the middle ear, the tube ( 10 ) having a flexible substantially tubular stem ( 12 ) with a lumen ( 14 ), the stem ( 12 ) being sized to be inserted through an incision in the eardrum ( 16 ) and the tube having at least two separate flexible contact surfaces ( 18 ) extending from the stem ( 12 ) and adapted to engage different spaced-apart inner surfaces of the eardrum 16 , each of the contact surfaces ( 18 ) having a first axis XX extending substantially perpendicularly to the central axis of the stem and a second axis YY extending substantially perpendicularly to the first axis wherein one of the axes is between 0.6 and 3 mm and the second of the axes is between 1 and 7 mm in length.
1. A flexible ear tube for draining and ventilating the middle ear, comprising:
a) a flexible substantially tubular stem with a lumen, said stem being sized for insertion through an incision in an eardrum; and
b) at least two anchoring arms extending from the stem, each arm comprising a flexible member and a contact surface;
wherein the contact surface of each arm engages a different area of the inner surface of the eardrum and is spaced apart from the stem by way of the flexible member; and
wherein each contact surface is between 0.6 and 3 mm in width and between 1 and 7 mm in length.
2. A flexible ear tube for draining and ventilating the middle ear according to claim 1 ,
wherein the ratio of the length to the width of each contact surface is between 1:6 and 1:1.
3. A flexible ear tube for draining and ventilating the middle ear according to claim 1 wherein each of said separate flexible contact surfaces has a substantially flat contact surface area of at least 1 mm 2 .
4. A flexible ear tube for draining and ventilating the middle ear according to claim 1 wherein each of said separate flexible contact surfaces has a substantially flat contact surface area of at least 1.5 mm 2 .
5. A flexible ear tube for draining and ventilating the middle ear according to claim 1 wherein each of said separate flexible contact surfaces has a substantially flat contact surface area of at least 2 mm 2 .
6. A flexible ear tube for draining and ventilating the middle ear, comprising:
a) a flexible substantially tubular stem with a lumen, said stem being sized for insertion through an incision in an eardrum; and
b) at least two means for anchoring adapted to anchor the tube within the eardrum, each comprising a flexible member and a contact surface; wherein the anchoring means are attached at or near one of the ends of the stem; and wherein the contact surface of each anchoring means is adapted to engage a different area of the inner surface of the eardrum and is spaced apart from the stem by way of the flexible member.
7. A flexible ear tube according to claim 6 wherein said anchoring means comprise at least two spaced-apart non-linear arms extending from said stem and each provided with a contact surface at the distal end thereof.
8. A flexible ear tube according to claim 1 wherein each of said arms ascribes a substantially concave, strait arch or twisted arch.
9. A flexible ear tube according to claim 6 wherein
the angle between the stem and the contact surfaces is less than 90 degrees.
10. A flexible ear tube according to claim 6 provided with a pair of opposed arched arms extending from one end of the stem.
11. A flexible ear tube according to claim 10 wherein said arms are symmetrically disposed.
12. A flexible ear tube according to claim 6 comprising at least three asymmetric arms extending from said stem.
13. A flexible ear tube according to claim 6 comprising four asymmetric arms extending from said stem, said arms including a first longer arm adapted upon insertion to be directed towards the anterior part of the tympanic cavity, a pair of relatively shorter arms adapted upon insertion to be directed superiorly and inferiorly within the tympanic cavity and a fourth relatively medium size arm adapted upon insertion to be directed towards the posterior part of the tympanic cavity.
14. A flexible ear tube according to claim 6 in combination with a flexible sleeve having a lumen sized to receive said tube comprising said stem and said anchoring means, said sleeve being provided with an open end through which said tube is insertable into a perforated eardrum.
15. A flexible ear tube according to claim 1 , made of translucent material or comprising fiberoptic fibers to illuminate the inner space of the middle ear.
16. A flexible ear tube according to claim 1 that contains fiber optic filaments, through which endoscopic view of the middle ear cavity is enabled.
17. A flexible ear tube for draining and ventilating the middle ear according to claim 1 , in combination with a manipulation wire extending at least 3 cm is removably attached to said tube.
18. A flexible ear tube for draining and ventilating the middle ear according to claim 17 , wherein said wire has a looped form at one extremity.
19. A flexible ear tube for draining and ventilating the middle ear according to claim 17 , wherein said wire holds at one extremity a guide tube, said flexible ear tube being disposed inside said guide tube.
20. A flexible ear tube for draining and ventilating the middle ear according to claim 19 , wherein said guide tube is open about 100-170 degrees.
21. A flexible ear tube for draining and ventilating the middle ear according to claim 1 , wherein said tubular stem is provided with a thin tab element attached to the outer portion of said stem for eccentric extraction of said flexible ear tube.
22. A flexible ear tube for draining and ventilating the middle ear according to claim 1 , wherein one of said arms is of a larger diameter and is stiffer than a second opposite support arm of a second flexible contact face.
23. A flexible ear tube for draining and ventilating the middle ear according to claim 1 , further provided with a bridge member attached to the two arms and a string firmly attached to said bridge member and extending outwards therefrom.
24. A flexible ear tube according to claim 6 , wherein the flexible member ascribes a substantially concave, straight arch or twisted arch.
25. A flexible ear tube according to claim 6 , wherein the flexible member is a folded strip.
26. A method for draining and ventilating a middle ear of a subject, the method comprising inserting a flexible ear tube according to claim 1 through an incision in the eardrum such that the contact surface of each arm engages the inner surface of the eardrum.
27. A method for draining and ventilating a middle ear of a subject, the method comprising inserting a flexible ear tube according to claim 6 through an incision in the eardrum such that the contact surface of each arm engages the inner surface of the eardrum.
28. The method of claim 27 , wherein the flexible ear tube is inserted through the incision using a bent rod with a flexible sleeve having a lumen sized to receive the flexible ear tube.
29. A flexible ear tube for draining and ventilating the middle ear according to claim 1 , wherein the ear tube is provided with a string configured to collapse a bridge member that bridges between the support arms during extraction of the ear tube from an ear canal.