One step tympanostomy tube and method of inserting same

1. A tympanostomy tube for insertion into and residence in a tympanic membrane of a mammal, the tympanostomy tube comprising:

a body including a first end portion, a second end portion, a central portion disposed between the first and second end portions, and an axially extending passageway having a first open end disposed adjacent the first end portion, and a second open end disposed adjacent the second end portion, and an axis extending between the first open end and second open end,

the first end portion including a relatively enlarged diameter, generally radially extending flange,

the central portion including a reduced diameter portion sized for extending through and residing in tissue of the tympanic membrane,

the second end portion including a relatively enlarged diameter second flange disposed adjacent the second end portion, the second flange including a perimetral edge having a sawing portion sufficiently sharp to saw through the tympanic membrane during insertion of the tympanostomy tube through the tympanic membrane, the sawing portion comprising a serrated edge containing sawing portion having a distal end being a rounded leading edge to increase the likelihood of the second flange forming an incision in the tympanic membrane and reducing the likelihood of the serrated edge containing sawing portion tearing or rupturing the tympanic membrane.

2. The tympanostomy tube of claim 1 wherein the second radially extending flange includes a relatively larger forwardly disposed portion, and a relatively smaller rear portion, wherein the forwardly disposed portion includes the serrated edge containing sawing portion, and the rounded leading edge.

3. The tympanostomy tube of claim 2 where the second flange has a tapered thickness, such that the rear portion is generally thicker than the forwardly disposed portion.

4. The tympanostomy tube of claim 1 wherein the second flange is disposed in a plane that is disposed at an oblique angle to the axis of the axially extending passageway.

5. The tympanostomy tube of claim 4 wherein the second flange is disposed at an oblique angle such that when the tympanostomy tube is placed against an exterior surface of a tympanic membrane such that the exterior surface is disposed in a plane generally perpendicular to the axis of the axially extending passageway, the serrated edge containing sawing portion of the forwardly disposed portion is disposed in a plane at an incising angle of less than about 90 degrees relative to the exterior surface of the tympanic membrane.

6. The tympanostomy tube of claim 5 where the incising angle of the serrated edge containing sawing portion of the forwardly disposed portion is between about 30 degrees and 70 degrees when the axis of the axially extending passageway is held generally perpendicular to an exterior surface of a tympanic membrane.

7. The tympanostomy tube of claim 1 wherein the second radially extending flange includes a relatively larger forwardly disposed portion, and a relatively smaller rear portion, and the second flange has a tapered thickness, such that the rear portion is generally thicker than serrated edge containing sawing portion of the forwardly disposed portion.

8. The tympanostomy tube of claim 1 wherein the second radially extending flange includes a forwardly disposed portion, and a rear portion, and the serrated edge containing sawing portion is disposed on the forwardly disposed portion.

9. The tympanostomy tube of claim 1 wherein the second flange is disposed in a plane that is disposed at an oblique angle to the axis of the axially extending passageway.

10. The tympanostomy tube of claim 1 wherein the second flange is disposed at an oblique angle to the axis of the axially extending passageway such that when the tympanostomy tube is placed against an exterior surface of a tympanic membrane such that the exterior surface is disposed in a plane generally perpendicular to the axis of the axially extending passageway, a sawing edge of the serrated edge containing sawing portion is disposed at an incising angle of less than about 90 degrees relative to the exterior surface of the tympanic membrane.

11. A tympanostomy tube for insertion into and residence in a tympanic membrane of a mammal, the tympanostomy tube comprising:

a body including a first end portion, a second end portion, a central portion disposed between the first and second end portions, and an axially extending passageway having a first open end disposed adjacent the first end portion, and a second open end disposed adjacent the second end portion, and an axis extending between the first open end and second open end,

the first end portion including a relatively enlarged diameter, generally radially extending flange,

the central portion including a reduced diameter portion sized for extending through and residing in tissue of the tympanic membrane,

the second end portion including a relatively enlarged diameter second flange disposed adjacent the second end portion, the second flange including a perimetral edge having a sawing portion sufficiently sharp to saw through the tympanic membrane during insertion of the tympanostomy tube through the tympanic membrane, the sawing portion comprising a serrated edge containing sawing portion having a distal end being a rounded leading edge configured for back and forth movement along the tympanic membrane to cause the serrated edge containing sawing portion to engage the tympanic membrane and to saw through the tympanic membrane to thereby increase the likelihood of the second flange cutting through the tympanic membrane and reducing the likelihood of the serrated edge containing sawing portion tearing or rupturing the tympanic membrane.