JP3066867U - Filter and drip chamber - Google Patents

Abstract

(57) [Problem] To provide a filter capable of reducing the generation of blood clots and preventing a decrease in filtration function by facilitating the escape of air bubbles. A mesh (9) is provided between a support (5) and a ceiling (16).
The filter 1 (11) in which the struts 7 formed are provided, and the uppermost stage 4 (14) of the mesh 9 is formed larger than the other meshes 9.
Behind the ceiling of the filter 1 (11), the slope 3 (1) whose upper or lower part communicates with the mesh 9 of the uppermost step 4 (14).
Filter 1 (11) formed with 3).

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improvement of a filter mounted on a drip chamber of an extracorporeal circulation circuit or a blood transfusion set.

[0002]

[Problems to be solved by conventional techniques and devices]

 A filter is installed in the drip chamber of the extracorporeal circulation circuit, blood transfusion set, etc. to remove fibrin and foreign substances in blood. A filter in which a mesh is formed by insert molding or a filter in which a mesh is formed in a bag shape and a supporting member whose both side surfaces are cut into a substantially semicircular shape is inserted into the filter so that the bag-shaped mesh is not bent. Etc. However, the insert-molded filter has a high manufacturing cost, and the filter in which the mesh is formed in a bag-like form requires time and labor for assembling, and when blood flows, turbulence occurs in the blood and bubbles are easily generated. Blood clots are generated due to insufficient removal of air bubbles. Therefore, in consideration of the manufacturing cost and the stability of molding, an injection molded product such as a filter 41 shown in FIG. FIG. 7 is a schematic view of a conventional filter 41, and FIG. 8 is an enlarged view of a filter upper portion 42 of the filter 41. The filter 41 includes a support 35, a ceiling 46, and a column 47, and a column 47 is formed vertically from the upper inner periphery of the support 35 toward the inner upper side. 46 are provided. A mesh 49 is formed by providing horizontal branches 48 at regular intervals between the columns 47. The size (width in the height direction, W1) of the mesh 49 is formed to be 300 μm, and three ceiling holes 45 are formed in the ceiling portion 46 of the filter 41. However, when the size of the mesh 49 of the filter 41 and especially the number of the ceiling holes 45 and the size of the holes, the air bubbles in the filter 41 cannot be completely removed and remain, so that a blood clot occurs and the filter 41 is clogged. The filtration function is reduced. The present inventors have conducted intensive studies in order to solve the above problems, and as a result, have arrived at the next invention.

[0003]

[Means for solving the problem]

[Claims for Utility Model Registration] [1] In the present invention, a support 7 having a mesh 9 is provided between the support 5 and the ceiling 6 (16), and the uppermost step 4 (14) of the mesh 9 is connected to another. Filter 1 formed larger than mesh 9
(11) is provided. [2] The filter 1 according to [1], wherein the filter 1 (11) has a slope 3 (13) whose upper part or lower part communicates with the mesh 9 of the uppermost step 4 (14) at the back of the ceiling of the filter 1 (11). (11) is provided. [3] The present invention provides the filter 11 according to [1] or [2], wherein a ceiling hole 15 communicating with the slope 13 is formed in a ceiling portion 16 of the filter 11. [4] The present invention provides a filter 1 (1) according to [1] to [3], wherein synthetic resin is integrally formed by injection molding.
1) is provided. [5] In the present invention, the upper cap 19 and the lower cap 20 are mounted on the chamber body 18, and the support base 5 of the filter 1 (11) according to any one of [1] to [4] is fitted to the lower cap 20. A drip chamber 17 is provided.

[0004]

FIG. 1 is a schematic view of a filter 1 of the present invention, and FIG. 2 is an enlarged view of a filter upper portion 2 of the filter 1. The filter 1 of the present invention includes a support 5, a ceiling 6, and a column 7. The filter 1 is provided with eight columns 7 vertically symmetrically from the inner peripheral upper part of the support base 5 slightly toward the upper inside, and a ceiling part 6 is provided at the tip of the column 7. A mesh 9 is formed by providing horizontal branches 8 at regular intervals on the outer periphery of the column 7. A support base protruding part 12 is formed at a substantially middle part of the outer periphery of the support base 5 and is fitted to a lower cap 20 of a drip chamber 17 described later. The size (width in the height direction, W1) of the mesh 9 is formed in a range from 200 μm to 300 μm. In particular, the size (width in the height direction, W2) of the topmost mesh 4 is from 300 μm to 500 μm.
The air bubbles in the filter 1 can be easily removed by forming the filter 1. Further, air bubbles entering the filter 1 are formed by forming an inclined surface 3 which is inclined upward at least on both sides around the lower apex P1 and which communicates with the mesh 9 of the uppermost step 4 behind the ceiling of the upper part 2 of the filter. It is easy to get out of the mesh 9 of the uppermost step 4 along the back slope 3.

FIG. 3 is a schematic view of a filter 11 according to another embodiment of the present invention, FIG. 4 is an enlarged view of a filter upper portion 12 of the filter 11, and FIG. 5 is a front view of a ceiling 16 of the filter upper portion 12. It is. The filter 11 is configured in the same manner as the filter 1, and a column 7 is provided vertically from the inner peripheral upper portion of the support base 5 to a slightly inner upper portion, and a ceiling portion 16 is provided at a tip of the column 7. The meshes 9 are also formed at regular intervals on the outer periphery of the column 7 like the filter 1, and the size (width in the height direction, W1) of the meshes 9 is formed from 200 μm to 300 μm. The size (width in the height direction, W2) is formed from 300 μm to 500 μm.
Further, a ceiling hole 15 formed radially from the center of the ceiling portion 16 as shown in FIG. 5 is formed in the ceiling portion 16 of the filter upper portion 12, and communicates with the ceiling hole 15 behind the ceiling and around the top apex P2. By forming a slope 13 that is inclined downward at least on both sides and the lower part communicates with the mesh 9 of the uppermost step 14, air bubbles in the filter 11 can easily escape from the ceiling hole 15 and also from the mesh 9 of the uppermost step 14. It becomes easy to fall out.

FIG. 6 is a schematic view of the drip chamber 17 equipped with the filter 1 (11) of the present invention. The drip chamber 17 includes a chamber body 18, an upper cap 19, and a lower cap 20. The upper cap 19 is provided with a body fluid introduction tube 21, a pressure monitor line 23, and a co-injection unit 24,
The lower cap 20 is provided with a discharge tube 22.
(11) After attaching the lower cap 20 to the chamber main body 18, the support base 5 of the filter 1 (11) is press-fitted to the inner peripheral wall of the lower cap 20 or bonded with a solvent,
It is further firmly fixed by the support base projection 10.

The drip chamber 17 mounted on the extracorporeal circuit stores body fluid (blood) in a chamber body 18 and sends the body fluid from the introduction tube 21 to the discharge tube. The pressure in the drip chamber is monitored through a pressure monitor line attached to the upper cap 19, and the adjustment and dosing of the body fluid level are performed through the co-injection unit. Air bubbles generated in the body fluid of the drip chamber 17 are filtered by the filter 1 (1).
Although it occurs partially in 1), as in the filter 1 (11) of the present invention, the uppermost 4 (1)
Since the mesh 9 of 4) is enlarged and the slope 3 (13) behind the ceiling and / or the ceiling hole 15 is provided in the ceiling portion 16, air bubbles can easily escape.

The drip chamber 17 is mounted on an extracorporeal circulation circuit. The drip chamber 17 is integrally formed with a chamber body 18 and a lower cap 20, and a discharge tube 22 is mounted on a lower end of the lower cap 20. The filter 1 (11) can be used as a drip chamber of a blood transfusion set or the like in which the filter 1 (11) is fitted to the upper cap 20 and the introduction tube 21 is attached to the upper cap 19.

[0009]

[Function and effect of the invention] Filter 1 (11) mounted in drip chamber 17
The mesh 9 of the uppermost step 4 (14) is larger than the other meshes 9 and the slope 3 (13) and / or a ceiling hole 15 is provided in the ceiling 16 at the back of the ceiling for introducing air bubbles into the uppermost step 4 mesh. By facilitating the escape of air bubbles in the filter 1 (11), it is possible to reduce the occurrence of blood clots and prevent a reduction in the filtering function of the filter.

[Brief description of the drawings]

FIG. 1 is a schematic view of a filter 1 of the present invention.

FIG. 2 is an enlarged view of a filter upper part 2 of the filter 1;

FIG. 3 is a schematic view of a filter 11 according to another embodiment of the present invention.

FIG. 4 is an enlarged view of a filter upper part 12 of the filter 11;

FIG. 5 is a front view of a ceiling part 16 of the filter upper part 12;

FIG. 6 is a schematic view of a drip chamber 17 equipped with the filter 1 (11).

FIG. 7 is a schematic diagram of a conventional filter 41.

FIG. 8 is an enlarged view of a filter upper part 42 of the filter 41.

[Explanation of symbols]

 1, 11, 41 Filter 2, 12, 42 Filter upper part 3, 13 Slope 4, 14, Uppermost step 5, 35 Support base 6, 16, 46 Ceiling part 7, 47 Post 8, 48 Side branch 9, 49 Mesh 10 Support base Projection 15, 45 Ceiling hole 17 Drip chamber 18 Chamber main body 19 Upper cap 20 Lower cap 21 Introducing tube 22 Discharge tube 23 Pressure monitor line 24 Co-injection section W1, W2 Height width P1 Lower top P2 Top

Claims (5)

[Utility model registration claims] 1. A mesh 9 between a support 5 and a ceiling 6 (16).
A filter 1 (11) characterized in that a support 7 having a mesh is formed, and the uppermost stage 4 (14) of the mesh 9 is formed larger than other meshes 9. 2. A filter according to claim 1, wherein an upper or lower part of the ceiling of the filter is formed with a slope which communicates with the mesh of the uppermost step. Filter 1 (11). 3. The filter 11 according to claim 1, wherein a ceiling hole 15 communicating with the slope 13 is formed in a ceiling portion 16 of the filter 11. 4. The filter 1 (11) according to claim 1, wherein the synthetic resin is integrally formed by injection molding. 5. A filter 1 (1) according to claim 1, wherein an upper cap 19 and a lower cap 20 are mounted on the chamber body 18, and the lower cap 20 is mounted on the lower cap 20.
A drip chamber 17 in which the support 5 of 1) is fitted.