Pressure-activated vibrating teether

1. A teething device comprising:

a fluid-filled membrane sized to be at least partially received in the mouth of a child;

a housing attached to the fluid-filled membrane and comprising a handle sized to be grasped by a child;

a vibrator configured to impart vibration to the fluid-filled membrane; and

a pressure switch, responsive to a hydraulic pressure developed within the fluid filled membrane, coupled to the fluid-filled membrane and selectively connecting the vibrator to a power source when the hydraulic pressure is developed in response to a threshold pressure applied to an outer surface of the fluid filled membrane.

2. The device of claim 1 further comprising a motor disposed within the housing and rotatably attached to the vibrator.

3. The device of claim 1 wherein the pressure switch is affixed to the fluid filled membrane, the pressure switch comprises two substantially parallel strips attached together at a first end and disposed proximally at a second end such that when the threshold-pressure is applied to the outer surface of the fluid-filled membrane, the second ends contact each other and activate the motor.

4. The device of claim 3 wherein the membrane further comprises a protrusion proximate to the second end of the switch, the protrusion deflecting outward and contacting the second end of the switch when the threshold pressure is applied.

5. The teething device of claim 1 wherein the vibrator comprises an eccentric weight and rotor that rotates the weight.

6. The teething device of claim 1 wherein a wall thickness of the membrane is between about 0.08 and 0.10 inches.

7. The teething device of claim 1 wherein the switch is responsive to gum pressure on the outer surface of the membrane.

8. The-teething device of claim 1 wherein the switch is responsive to fluid pressure within the membrane.

9. The teething device of claim 2 wherein the motor cycles for a predetermined duration when activated by the pressure switch.

10. The teething device of claim 1 wherein the membrane contains a pliable gel.

11. The teething device of claim 1 wherein the membrane contains sterilized water.

12. The teething device of claim 1 wherein the housing further comprises a rattle.

13. The teething device of claim 1 wherein the membrane comprises teething tabs.

14. The teething device of claim 1 wherein the threshold pressure is between 1 and 6 pounds.

15. The teething device of claim 1 wherein the membrane comprises a thermoplastic elastomer.

16. The teething device of claim 1 wherein the handle is formed of injection molded polypropylene.

17. A teething device comprising:

a fluid-filled membrane sized to be at least partially received in the mouth of a child;

a housing attached to the fluid-filled membrane and further comprising a handle sized to be grasped by a child;

a vibrator operably linked to the fluid-filled membrane;

a motor and power source disposed within the housing and rotatably attached to the vibrator; and

a pressure switch, responsive to a hydraulic pressure developed within the fluid-filled membrane, coupled to the fluid-filled molded membrane, the pressure switch selectively connecting the motor and the power source when the hydraulic pressure is developed in response to a threshold pressure applied to an outer surface of the fluid filled membrane.

18. A method of massaging the gums of a child, the method comprising: placing a fluid-filled membrane of a teether proximate to a child's mouth and placing a handle of the teether proximate to a child's hand, the teether including a vibrator and a power source; activating a pressure switch when a hydraulic pressure is developed within the fluid-filled membrane in response to a predetermined threshold pressure applied to an outer surface of the membrane; selectively connecting the vibrator and the power source in response to activation of the pressure switch; and imparting vibratory motion to the membrane.