Oregon startup RevMedX's new device XSTAT 30 is a syringe filled with tiny, biocompatible sponges, which can be injected into a deep wound to absorb blood and seal it in less than a minute. While it's been used on the battlefield since April 2014, it was recently approved by the FDA for civilian use.
A RevMedx researcher told PBS NewsHour that the sponges expand up to 15 times their size when they make contact with blood, which allows them to apply internal pressure to the walls of the wound cavity and block blood flow. The sponges would replace a medic's traditional method of deeply packing a wound with gauze and maintaining pressure.
A syringe with tiny sponges can seal a gunshot wound in seconds.

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