Patent ID: 9415199
Filing Date: 2016-08-16
CPC Classification: A61M

Claim Text:
1. A leak proof needleless medical connector comprising: a housing including: an actuator being hollow, movably disposed within the outer casing of the housing and mounted around the valve tube of the housing; a resilient member disposed within the outer casing of the housing and including in sequence: a bottom valve stem disposed in the lower compression tube and mounted in the valve tube of the housing, a gap formed between the bottom valve stem and the valve tube, a top end of the valve tube selectively abutting the at least one through hole of the column such that the gap does not communicate with the interior of the upper compression tube, a bottom end of the bottom valve stem abutting the bottom annular blocking projection of the valve tube to close an open bottom of the valve tube; a top valve stem disposed in the upper compression tube and having an enlarged portion at its top end; and an adapter being hollow and mounted on a top of the outer casing of the housing, the resilient member mounted between the adapter and the actuator, the enlarged portion of the top valve stem selectively abutting an inner surface of the adapter such that the interior of the upper compression tube does not communicate with an interior of the adapter; wherein, a needleless medical injector is screwed with the adapter to inject medication; before a dosing unit is mounted in the adapter, the enlarged portion of the top valve stem abuts the inner surface of the adapter to prevent the interior of the adapter from communicating with the interior of the upper compression tube, the top end of the valve tube abuts and seals the at least one through hole of the column to prevent the medication in the interior of the upper compression tube from flowing into the interior of the lower compression tube, and the bottom annular blocking projection of the valve tube abuts the bottom valve stem to prevent the medication in the valve tube of the housing from leaking out; when the dosing unit is mounted in the outer casing of the housing to push upward the resilient member, the bottom valve stem is removed from the bottom annular blocking projection of the valve tube, the at least one through hole of the column is removed from the top end of the valve tube, and the enlarged portion of the top valve stem is removed from the inner surface of the adapter, thus the gap communicates with an exterior environment, the interior of the lower compression tube communicates with the interior of the upper compression tube, and the interior of the upper compression tube communicates with the interior of the adapter, so the medication in the adapter in sequence flows into the housing, the at least one through hole, and the gap, and then flows out between the bottom valve stem and the bottom annular blocking projection of the valve tube into the dosing unit.