CPC A61M 39/20 (2013.01) [A61M 5/158 (2013.01); A61M 5/165 (2013.01); B01D 46/543 (2013.01); B01D 46/62 (2022.01); A61M 2005/1657 (2013.01); A61M 2205/3344 (2013.01); A61M 2205/7509 (2013.01); A61M 2205/7518 (2013.01); A61M 2205/7545 (2013.01); B01D 2279/35 (2013.01)] | 4 Claims |
1. A device for preventing contamination of a positive-pressure connector of an indwelling needle, comprising:
a shell;
a connecting port fixedly connected to the shell and used for connecting to the positive-pressure connector;
an air pressure balance hole disposed opposite to the connecting port and provided on the shell; and
a plurality of filtering membranes disposed between the air pressure balance hole and the connecting port;
among the plurality of filtering membranes, the filtering membrane closest to the air pressure balance hole is a primary filtering membrane, wherein the primary filtering membrane is separated from the other filtering membranes;
wherein a top of the shell is provided with an upward convex part;
the air pressure balance hole is at the upward convex part;
the plurality of filtering membranes comprises:
the primary filtering membrane clinging to a bottom of the air pressure balance hole; and
a second filtering membrane and a third filtering membrane sequentially provided from top to bottom below the primary filtering membrane, wherein
the third filtering membrane is clinging to a top of the connecting port; and
the connecting port is internally provided with an internal thread adapted to an external thread of the positive-pressure connector.
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