Abstract: A battery-powered system includes a device and a battery. The device includes a recess for receiving the battery and an electrical contact disposed at the bottom of the recess. The device includes front and back guide elements and a spacer with a raised portion and a ramp. The battery has front and back guide elements constructed to mate with corresponding front and back guide elements of the device such that when the guide elements are mated, the battery is in a locked position. A battery electrical contact is disposed along the device-facing major surface, constructed to operatively couple with the device electrical contact. The spacer is constructed to reduce wear and damage to the electrical contacts by reducing contact with the electrical contacts while the battery is moved long the spacer.

Abstract: An earplug comprises a core and a sound-attenuating body attached to the core, the sound-attenuating body comprising a tip cavity extending proximally from the tip of the sound-attenuating body and comprising a distal opening. The tip cavity side wall includes a plurality of protrusions extending inwardly toward the longitudinal axis of the core. The plurality of protrusions may include from 2 to 12 protrusions. A method of making an earplug includes covering at least a portion of a core with a material including unactivated foaming agent; inserting an end of the core and at least a portion of the material into a mold cavity; and activating the foaming agent to create a sound-attenuating body. The sound-attenuating body has a base, tip, and tip cavity with a plurality of protrusions. The mold cavity may include a boss with a cup and plurality of cut-outs on the cup for forming the protrusions.

Abstract: An earplug comprises a core and a sound-attenuating body attached to the core, the sound-attenuating body comprising a tip cavity extending proximally from the tip of the sound-attenuating body and comprising a distal opening. The tip cavity side wall includes a plurality of protrusions extending inwardly toward the longitudinal axis of the core. The plurality of protrusions may include from 2 to 12 protrusions. A method of making an earplug includes covering at least a portion of a core with a material including unactivated foaming agent; inserting an end of the core and at least a portion of the material into a mold cavity; and activating the foaming agent to create a sound-attenuating body. The sound-attenuating body has a base, tip, and tip cavity with a plurality of protrusions. The mold cavity may include a boss with a cup and plurality of cut-outs on the cup for forming the protrusions.

Abstract: The present description provides an earplug. One exemplary earplug described herein includes a stem and a sound attenuating body attached to the stem. The sound attenuating body includes a leading end, a base end, a tip region positioned rearward of the leading end, and a longitudinal axis extending between the leading end and the base end. An array of cavities is positioned within the tip region and spaced around the longitudinal axis and provides a collapsible volume.

Abstract: Hearing protection devices, e.g., push-to-fit earplugs, having a tip cavity in the sound attenuating body and methods of manufacturing the hearing protection devices are described herein.

Abstract: Hearing protection devices, e.g., push-to-fit earplugs, having a tip cavity in the sound attenuating body and methods of manufacturing the hearing protection devices are described herein.

Abstract: The present description provides an earplug. One exemplary earplug described herein includes a stem and a sound attenuating body attached to the stem. The sound attenuating body includes a leading end, a base end, a tip region positioned rearward of the leading end, and a longitudinal axis extending between the leading end and the base end. An array of cavities is positioned within the tip region and spaced around the longitudinal axis and provides a collapsible volume.

Abstract: The present description provides an earplug. One exemplary earplug described herein includes a stem and a sound attenuating body attached to the stem. The sound attenuating body includes a leading end, a base end, a longitudinal axis extending between the leading end and the base end, and a flange extending at least partially over the stem and having an exterior flange surface and an interior flange surface having a plurality of one or both of protrusions or recesses. The earplug further includes a flange cavity including a continuous volume around a perimeter of the stem between the interior flange surface and the stem. A distance between the interior and exterior flange surfaces varies around a perimeter of the flange at a plane intersecting the flange transverse to the longitudinal axis.