JPH0240987Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an improvement of a push stage used when transferring separated components in a plastic bag to another bag via a connecting tube. .

(Prior art and its problems) For example, when blood collected in a blood bag is centrifuged and the separated supernatant plasma is transferred to a plasma collection bag via a connecting tube, a plasma separation table is used. That is well known.

This plasma separation table generally consists of a pedestal, a back plate fixed to the pedestal, and a pressure plate that can be opened and closed in the direction of the back plate. Holding the blood collection bag,
While gradually pressing this blood collection bag with a pressure plate, the supernatant plasma is transferred to the plasma collection bag via a connecting tube.

However, the conventional plasma separation table described above
Since the back plate and the pressure plate are flat, when the pressure plate is pressed and pressure is applied uniformly to the blood collection bag, the flow rate of blood components in the center of the bag becomes faster due to fluid dynamics, and the blood components at both ends in the width direction of the bag increase in flow rate. There was a problem in that precipitated blood cells were pushed out from the center of the bag into the connecting tube before plasma was pushed out of the connecting tube. That is, as is well known, the blood collection bag is made by overlapping two soft plastic sheets.
Since the bag is manufactured by sealing the periphery in a bag shape, the cross-sectional area of the opening near both widthwise ends (near the sealed part) of the bag is narrower than that of the center, and the blood components flowing around the bag are narrower than the center. Frictional resistance increases with respect to the sheet. Therefore, a difference in flow velocity occurs between the back center and the center, and the plasma flowing near the center reaches the mouth of the connecting tube first, flows out from the connecting tube, and the plasma flowing near both ends in the width direction remains. It turns out.

In order to push out this residual plasma component into the connecting tube, conventionally, for example, a pressure plate is used to press the blood collection bag, and the pressure plate is stopped just before plasma separation is completed, that is, when the sedimented blood cells have been pushed up to the mouth of the connecting tube. It was necessary to manually press the bag to push out the plasma components that had been pushed up from both ends of the blood collection bag into the connecting tube.

Therefore, the purpose of the present invention is to push out the separated components in the plastic bag from the connecting tube by simply pressing the pressure plate against the bag, and the separated components are completely removed from the connecting tube without remaining in the bag. The goal is to allow it to flow out.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that a recess is formed in the pressure plate and/or back plate in the vicinity of the connection position of the plastic bag connecting tube. It is.

(Function) By adopting the above configuration, when the pressure plate gradually presses the plastic bag from below, the pressure applied by the pressure plate to the center of the plastic bag becomes weaker, and the pressure between the center and both ends in the width direction becomes weaker. Since the blood components flow out at a uniform rate, the separated components in the upper layer of the bag flow out of the constriction tube at the same speed, and any partial residue of the separated components is eliminated.

(Example) The attached drawing shows an example of the present invention, in which 1 is a pedestal, 2 is a back plate fixed to the pedestal, and 3 is a pressure plate similarly attached to the pedestal 1 by a hinge 4. This pressure plate 3 can be opened and closed in the direction of the back plate 2 using a hinge 4 located near the bottom of the back plate 2 as a fulcrum, and an operating lever 5 is provided at the bottom.

Further, a recess 6 is formed in the upper part of the pressure plate 3 and is recessed in a direction opposite to the back plate 2. Although the recess 6 has a semi-conical shape in this embodiment, it is not limited to this shape.

The position where the recess 6 is formed is the blood collection bag 7.
The location corresponding to the connection position of the connecting tube 8 is effective, and in this embodiment, it is formed approximately at the center of the upper part of the pressure plate.

FIG. 2 shows another embodiment of the pressure plate, in which the pressure plate 3
The upper part 3b of a is curved outward, and the upper central part is curved to form a recessed part 6a.

In addition, in FIG. 1, 9 is a hook for hooking the operating lever 5.

3 to 5 show still another embodiment of the present invention. First, FIG. 3 shows the pressure plate 21 formed shorter than the back plate 20, and FIG. 4 shows the length of both. The pressure plate shown in FIG. 5 is formed to be longer than the back plate 20.
A recess 23 formed by cutting out the upper end of the pressure plate 21 in a semicircular shape
A center line mark 22 is formed in the upper center of the back plate 20 to fix the position of the blood bag communication piece.

In the present invention, the recesses 6, 23 may be replaced with the pressure plates 3, 21, or may be formed together with the pressure plates 3, 21 on the back plates 2, 20, and the center line mark 22 may also be formed as necessary. It may also be attached to the pressure plate side.

Next, an example of use of the above embodiment will be explained.
First, the blood in the blood collection bag 7 made of soft plastic is centrifuged and separated into red blood cells 11 and plasma 12, and then the blood collection bag 7 is placed against the back plate 2. After the communication piece 8a provided at the connecting portion of the connecting tube 8 is folded to open the flow path, the blood collection bag 7 is pressed from below by the pressure plate 3. As a result, the supernatant plasma 12 is transferred to the plasma collection bag 10 through the communication tube 8.

In this way, the pressure plate 3 gradually closes, and the blood collection bag 7
When the remaining plasma in the bag 10 becomes low, since the recess 6 is formed in the upper part of the pressure plate 3, both ends of the bag 10 in the width direction are pressed more strongly than the center. Therefore, the outflow rate of the blood components in the bag 10 becomes uniform, and the supernatant plasma is completely pushed out of the connecting tube 8 at the same rate. At this time, the pressure plate 3 is pressed against the bag 10 to the extent that a portion of the red blood cells flows into the connecting tube 8 slightly. After that, connecting tube 8
In this case, the boundary between red blood cells and plasma is sealed.

(Effects) According to the present invention explained above, when the separated components in the plastic bag are pushed out to other bags etc. through the connecting tube, the outflow speed of blood at the center and both widthwise ends of the bag becomes uniform. As a result, the separated components can be completely driven into the connecting tube, eliminating the need for manual extrusion as required in the past, reducing separation time.
Effects such as increased work efficiency can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figures are perspective views of main parts showing other embodiments, Figures 3 and 4.
Figures 5 and 5 show still another embodiment of the present invention, in which a is a perspective view of the main part and b is a front view. In the figure, 1 is a pedestal, 2 is a back plate, 3 is a pressure plate, 6 is a recess, 7 is a blood collection bag, and 8 is a connecting tube.

Claims (1)

[Claims for Utility Model Registration] A stand for extruding separated components of a plastic bag comprising a stand, a back plate fixed to the stand, and a pressure plate provided to be openable and closable in the direction of the back plate, comprising: A stand for extruding separated components of a plastic bag, characterized in that a recess is formed in the back plate in the vicinity of the connecting tube connection position of the bag.