DEVICE ASSEMBLY FOR NEEDLELESS SYRINGE
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United States of America Patent
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Issued Date -
Jan 18, 2024
app pub date -
Sep 15, 2021
filing date -
Nov 11, 2020
priority date (Note) -
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Abstract
A device assembly for a needleless injector including a gas generating agent formed such that a combustion rate thereof is lower than a combustion rate of an ignition agent and a combustion duration thereof is longer than a combustion duration of the ignition agent. The device assembly may be configured to pressurize the injection objective substance such that an ejection pressure of the injection objective substance, defined as a pressure of the injection objective substance ejected from an ejection port, increases to a first peak pressure after pressurization is started, decreases to a pressure lower than the first peak pressure, and then increases again to a second peak pressure. The device assembly may be configured to activate an igniter and cause the ejection pressure of the injection objective substance to reach the first peak pressure by a pressure of a combustion gas of the ignition agent.
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