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Blast attenuating earplug

  • US 9,138,352 B2
  • Filed: 12/13/2012
  • Issued: 09/22/2015
  • Est. Priority Date: 12/20/2011
  • Status: Active Grant
First Claim
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1. An earplug comprising:

  • a body configured to be inserted into an ear canal, the body defining a channel having at least two ends and a cavity;

    a movable structure disposed within the cavity in the channel; and

    a retaining mechanism comprising one or more filaments configured to retain the movable structure in a rest position within the cavity;

    wherein the movable structure is configured to allow passage of sound around the movable structure in the rest position within the channel,block at least a portion of the channel in a deflected position within the channel, andmove from the rest position to the deflected position based on receiving, at one of the at least two ends of the channel, a pressure wave having at least a threshold amplitude pressure, andwherein the retaining mechanism is configured to break responsive to the deflection of the movable structure to the deflected position.

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