JPH052193Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applicable to infusion sets, winged intravenous needles, indwelling needles, blood bags, This relates to the improvement of medical devices such as infusion bags.

(Prior art and problems) Figure 14 shows the currently used infusion set 1.
0 is shown schematically. The infusion set 10 includes an infusion tube 12 with a liquid introduction needle 17 attached, a liquid transfer tube 13 with a roll clamp 14 in the middle, a rubber tube 17, and an octopus with an infusion needle 19 attached via a stopper rubber 20. It is composed of a tube 18. In the figure, 21
is an infusion filter.

The infusion filter 21 is made by covering the end of a rigid support 22 made of polypropylene or the like with a mesh-like sheet woven with polyester or polyamide fibers as shown in FIG. 16, as shown in FIG. This is connected to the liquid transfer tube 13 and the rubber tube 17.
It was used by attaching it to the connecting point of the octopus tube 18, by welding it to the end of the octopus tube 18 and connecting it to the rubber tube 17, or by press-fitting or welding it into the chamber.

Therefore, since the mounting position of the filter 21 is limited to the connection point of the liquid transfer tube 13, its application is narrow, and when in use, the tube 13 is easily deformed by external force, resulting in uneven opening. , microscopic dust, blood cells, etc. tended to get entangled in the layered fibers, making it impossible to fully demonstrate its function as a filter.

Furthermore, Japanese Utility Model Publication No. 49-29791 describes a filter made of a porous sintered member, and Publication of Utility Model Publication No. 51-50388 describes an infusion set in which a sintered nylon filter is installed in the middle of the liquid flow path. . However, these sintered filters have a pore size of 1μ.
(0.01mm) very small around the front and back, and the hole arrangement,
Since the shape is irregular, the pores are easily clogged by foreign objects, air, etc. in the liquid. In addition, it was not suitable for filtering highly viscous liquids (including blood, highly viscous infusions, medical solutions, etc.). In order to solve the above problems, the inventor of the present invention has made extensive studies and has arrived at the following idea.

(Means for Solving the Problems) The present invention consists of a synthetic resin material that is integrally molded by injection molding, has ribs 9 or recesses 9a formed in the liquid flow path, and has a hole diameter of 0.17 to 0.22 mm. The present invention provides a medical device to which a lattice filter is attached and fixed.

(Function) The filter member can be firmly installed in the liquid flow path of the medical device, and reliable filter function can be maintained by constant visual inspection from beginning to end without deformation or hole clogging during use.

(Example) Fig. 1 is a schematic diagram of an integrally molded filter 8 used in the medical device of the present invention.The filter 8 is made of a single synthetic resin such as polyacetal, polyethylene, polyester, polypropylene, polyamide, etc. It is integrally molded. The filter 8 is a flat filter formed in a grid shape and having a plurality of uniformly shaped (for example, square, rectangular, circular) holes formed facing the direction in which the liquid flows. A flange 8 is attached to the outer periphery of the filter 8 as necessary.
b is formed. Also, the hole diameter is from 0.17mm to 0.21mm.
mm (170μ to 210μ). If it is less than 0.17 mm, clogging will easily occur during liquid filtration, and injection molding will be difficult. On the other hand, if it is 0.21 mm or more, the hole diameter is too large to prevent the passage of chips, etc. from rubber plugs, rubber tubes, etc.

The filter 8a shown in FIG. 2 has ribs 9b formed on the outer periphery, and the ribs 9b may be formed directly on the outer periphery of the hole, or may be formed on the outer periphery of a flange 8c if necessary.

The filter 8b shown in FIG. 3 (a vertical cross-sectional view taken from FIG. 1 as an A-O-A' cross-section) has the flanges 8b and 8c formed on a cylindrical body 8d. A flat filter 8c corresponding to the filters 8 and 8a is placed inside.

4 is a schematic diagram of the infusion set 1, and FIG. 5 shows a rib 9 in the connecting tube on the liquid transfer tube side of the octopus tube 4.
Fig. 6 is a partially cutaway sectional view showing a state where a filter 8 integrally molded with a diameter slightly smaller than the inner diameter of the connecting pipe is attached and fixed. It is a partially cutaway sectional view showing the integrally molded filter 8a installed and fixed. Figure 7 shows A of Figure 5 when discontinuous ribs 9 are formed in the connecting tube of the octopus tube.
-A sectional view, FIG. 8 is a sectional view taken along line A-A in FIG. 5 when continuous ribs 9 are formed in the connecting pipe of the octopus tube, and FIG. 9 is a discontinuous recess 9 in the connecting pipe of the octopus tube.
6 is a cross-sectional view taken along the line BB in FIG. 6, in which a filter 8a formed integrally with the filter 8a is mounted and fixed.

The infusion set 1 includes a drip chamber 2 with a bottle needle 5, a liquid transfer tube 3, an octopus tube 4,
It is composed of an intravenous needle 7, and has a rib 9 or a recess 9a in the connecting tube between the liquid transfer tube 3 and the octopus tube 4.
is formed.

The rib 9 is provided with the integrally molded filter 8 having an outer diameter slightly smaller than the inner diameter of the connecting pipe of the octopus pipe 4.
is attached and fixed with a solvent or adhesive.

It is preferable that the rib 9 be installed at a rear position of the filter 8 when viewed from the direction in which the liquid flows.
(Fig. 8) or a continuous version (Fig. 8).

Next, place filter 8 on medical equipment other than the infusion set.
10 to 1 show examples in which the
Shown in Figure 3. FIG. 10 shows a rib 9 formed on the luer connector part 32 of the winged venous needle 31 and a filter 8
It is a schematic diagram when it is attached and fixed.

FIG. 11 is a schematic view of the case where ribs 9 are formed on the needle base 34 of the indwelling needle 33 and the filter 8 is attached and fixed. Figure 12 shows blood bag (infusion bag) 3.
13 is a schematic view of the case where the filter 8a is installed in the communication tube 36 of No. 5, and FIG.
It is a partially enlarged view of the vicinity of a.

The filter 8a is mounted and fixed in a recess 9a formed in the communication tube 36, thereby preventing turbulent flow of the liquid and preventing blood from coagulating, etc., thereby allowing smooth liquid transfer.

As described above, in medical devices that can form ribs or recesses in the middle of the liquid flow path, filters can be easily attached and fixed, and the ribs or recesses can be used depending on the purpose of use and the medical device. be able to demonstrate fully.

(Effects of the invention) As described above, according to the invention, the opening of the eyes can be kept constant without being deformed by external force or liquid pressure during use. Reliable filter function can be maintained by constant visual inspection from beginning to end without clogging the holes due to foreign objects or air. It is also possible to filter highly viscous liquids (including blood, highly viscous infusions, medical solutions, etc.). It can be mounted and fixed anywhere where ribs or recesses can be formed, and can be used depending on the purpose of use. It has the following effects.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a filter used in the medical device of the present invention, FIG. 3 is a longitudinal sectional view showing another embodiment of the filter, FIG. 4 is a plan view showing an infusion set, and FIG. Figure 5 is a partially cutaway cross-sectional view showing a place where a rib is provided in the connecting tube of the octopus tube and a filter is attached and fixed, and Figure 6 is a partially cutaway view showing a place where a recess is provided in the connecting tube of the octopus tube and a filter is attached and fixed. A cross-sectional view, FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 5 when discontinuous ribs are formed in the octopus tube.
Figure 8 is a sectional view taken along the line A-A in Figure 5 when continuous ribs are formed in the octopus tube, and Figure 9 is a cross-sectional view taken along the line A-A in Figure 5 when a continuous rib is formed in the octopus tube, and Figure 9 is a cross-sectional view when a discontinuous recess is formed in the connecting tube of the octopus tube and a filter is attached and fixed. Fig. 6 is a cross-sectional view taken along line B-B, Figs. 10 to 13 are schematic views of filters attached to other medical equipment, Fig. 14 is a plan view showing a conventional infusion set, and Fig. 15 is a conventional infusion set. Fig. 16 shows a partially enlarged view of the conventional filter. In the figure, 1 is an infusion set, 2 is a drip chamber, 3 is a liquid transfer tube, 4 is an octopus tube, 5 is an introduction needle, 8, 8a, 8b are filters, 9 is a rib,
9a indicates a recess.

Claims (1)

[Scope of utility model registration request] A medical device characterized in that a rib 9 or a recess 9a is formed in the liquid flow path, a hole diameter is set from 0.17 to 0.22 mm, and a synthetic resin grid filter integrally molded by injection molding is attached and fixed. .