Device for preventing contamination of positive-pressure connector of indwelling needle and method based on same

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.

2. The device for preventing contamination of the positive-pressure connector of the indwelling needle according to claim 1 , wherein

a pore diameter of the plurality of filtering membranes is 0.02-2 μm, and the plurality of filtering membranes comprises a polyethersulfone membrane, a cellulose filter membrane, a nuclear track membrane, an ion-exchange membrane, a nylon membrane, a polytetrafluoroethylene membrane, a polyvinylidene fluoride membrane, or a polypropylene membrane;

the shape of the shell comprises a cylindrical shape, a spherical shape, an ellipsoidal shape, a rectangular shape, a gourd shape, an upper convex lower flat shape, an upper flat lower convex shape, an upper large lower small shape, or an upper small lower large shape;

the diameter of the air pressure balance hole is from a nanometer to a millimeter, and the shape of the air pressure balance hole comprises a circle, an ellipse, a square, a rectangle, or a triangle.

3. A method using a device for preventing contamination of a positive-pressure connector of an indwelling needle,

wherein the device is comprises: 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, wherein 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 the method comprises:

providing the plurality of filtering membranes between the air pressure balance hole and the connecting port; and

isolating and filtering microorganisms, bacteria, viruses, dusts and particulate pollution sources through the plurality of filtering membranes, wherein

an inner cavity of the shell is in communication with the outside through the air pressure balance hole to achieve air exchange, and ensure that the device is in a positive-pressure state;

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.

4. 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;

a plurality of air pressure balance holes disposed opposite to the connecting port and provided on the shell; and

a plurality of filtering membranes disposed between the plurality of air pressure balance holes and the connecting port;

among the plurality of filtering membranes, the filtering membrane of the plurality of filtering membranes that is positioned closest to more of the plurality of air pressure balance holes 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.