JPS59918Y2 - "filtration" material - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a filter that is inserted into an infusion barrel or a syringe barrel of an infusion set.

Conventional filters for infusion sets have a disc-shaped filter body, and elongated cylindrical filters made of porous material are known, and the cylindrical filter body requires an adapter (joint). It is something to do.

The inventor devised a filter that has a large filtration area and can be easily attached to a drip tube, syringe, etc. without the need for an adapter.
This invention was achieved.

The present invention provides a filter made of a thermoplastic synthetic resin sintered porous material used in a drip tube, etc. that has a needle attachment part at the tip, and whose vertical cross-section has a semicircular shape with a diameter equal to the inner diameter of the inner circumferential wall of the tip of the drip tube, etc. This is a filter for a drip tube, etc., which is formed into a circular concave body, and whose opening is integrally formed with a ring-shaped opening wall that is brought into close contact with the inner circumferential wall.

In the present invention, a drip tube, etc. means a drip tube of a drip set or various syringes, and a thermoplastic synthetic resin sintered porous body is made of polyethylene, polypropylene, or other thermoplastic synthetic resin, and has elastic properties. A semicircular shape refers to a sintered porous body that is sticky and microporous, and a semicircular shape means that the vertical cross section of the concave body excluding the annular opening wall is semicircular or trapezoidal with a top wall and a peripheral wall formed in straight lines. means the form of

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a partially cutaway vertical cross-sectional view of the present invention in use on a drip barrel with an intravenous needle attached, Fig. 2 is a semicircular vertical cross-sectional filter of the present invention, and Fig. 3 is a separate FIG. 4 is a top view of another embodiment shown in FIG. 3, and FIG. shows a top view of a filter whose vertical cross section is trapezoidal and whose top surface is circular.

In the figure, reference numeral 1 denotes a filter with a semicircular longitudinal section, and the outer circumferential surface of a ring-shaped wall 2 integrally provided at the open end of the filter 1 is in contact with the inner circumferential surface of the tip of the drip tube 5. The formed filter 2 is an annular wall integrally provided at the openings of the filters 1 and 3, and its outer diameter is approximately the same as the inner diameter of the inner tip circumferential wall of the drip tube 5, that is, the tip circumferential wall on the infusion outlet side. Similarly, the outer surface of the annular opening wall 2 and the inner surface of the tip of the drip tube 5 are formed so as to be in close contact with each other, and the opening end is the connecting surface of the drip tube 5 and the needle attachment member 6. 8 is a ring-shaped opening wall formed to closely abut, 3 is a filter having a trapezoidal longitudinal section according to another aspect of the present invention, and the opening is similar to the filter 1 having a semicircular longitudinal section. A ring-shaped opening wall 2 is integrally formed, and the top part 4 is a filter 5 having a rectangular shape 4', a circular shape 4'', etc. when viewed from the top.
6 is a drip tube, and 6 is a mounting member for the intravenous needle 7 provided at the tip of the drip tube 5. At its center, the rear end communicates with the hollow part of the drip tube 5, and the intravenous needle 7 is attached to the front end. , a needle attachment member provided with an infusion fluid circulation hole that communicates the hollow part of the intravenous needle 7 and the hollow part of the drip barrel 5 is shown.

According to the present invention, with the above structure, the outer surface of the ring-shaped opening wall of the filter is in close contact with the inner wall surface of the tip of the drip tube, etc., as shown in FIG. At the same time, the open end of the ring-shaped opening wall is brought into contact with the rear end surface of the needle attachment member, and the filter is tightly attached to the inner tip of the body of the drip tube, etc. Since the filtration area is large, it not only prevents leakage of the chemical solution, but also reduces the flow resistance of the chemical solution, resulting in extremely good filtration performance.

Moreover, it can be attached to and detached from a drip tube extremely easily without using an adapter or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a cross-sectional view for explaining the usage state of the present invention, FIG. 2 is a vertical cross-sectional view of the present invention, and FIG. 3 is a vertical cross-sectional view of another embodiment of the present invention. FIG. 4 is a top view of another embodiment of the present invention, where A shows a filter with a square top surface, and the mouth shows a filter with a circular top surface.

Claims (1)

[Scope of utility model registration request] In a filter made of a porous thermoplastic synthetic resin used for a drip tube, etc. that has a needle attachment part at the tip, the vertical cross section is formed into a semicircular concave body whose diameter is the inner diameter of the inner circumferential wall of the tip of the drip tube, etc. , a filter for a drip tube or the like, characterized in that a ring-shaped opening wall that is brought into close contact with the inner circumferential wall is integrally formed in the opening thereof.