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US 10,369,342 B2Granted
Drug solution injection device
AssigneeToppan Printing Co., Ltd.
InventorYoshihiro Kodama
Life of this patent
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Abstract
An injection device including a microneedle structure including a substrate having a first surface and a second surface opposite to the first surface, and a protrusion protruding from the first surface in a direction opposite to the second surface, the protrusion having a through hole which penetrates from a tip of the protrusion to the second surface in the direction of the protrusion such that a liquid flows through the through hole, and one or more check valves positioned to stop the liquid flowing from the second surface.
Claims20
An injection device, comprising:
- a microneedle structure having a channel;
- a check valve positioned in the channel of the microneedle structure;
- and
- an annular seal member positioned on downstream of the check valve in the channel such that the annular seal member is in contact with an outer peripheral portion of the check valve,
- wherein the microneedle structure includes a substrate and at least one protrusion formed on a first surface of the substrate such that the at least one protrusion is protruding from the first surface of the substrate and has a through hole penetrating from a tip of the at least one protrusion to a second surface of the substrate on an opposite side with respect to the first surface and configured to flow a liquid from the channel, and the annular seal member is sandwiched between the check valve and the second surface of the substrate inside the channel and enclosing an opening of the through hole.
2 more elements
Dependencies are inferred from the claim text.