JPS63102764A - Blood storage tank - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blood reservoir for use in a heart-lung machine during surgical procedures. More specifically, the present invention relates to a blood reservoir capable of storing intracardiac blood and venous blood.

[Prior Art] An artificial heart-lung circuit used in the surgical procedure uses a blood reservoir that filters and defoams intracardiac blood that is collected by suction from the surgical field and then stored therein. The blood processed in this blood reservoir is then stored in a second blood reservoir along with the blood removed from the vena cava, and is sent to the oxygenator by a blood pump, oxygenated, and returned to the patient. Generally, the former blood storage tank is
No. 7139, 60-. No. 58159 and 60-103
As disclosed in publications such as No. 968, a filter for filtering foreign particles such as micro tissue fragments and microaggregates contained in blood and an antifoaming material for defoaming are integrated. It is designed to continuously remove foreign particles and defoam by passing blood through it. Then, the filtered and defoamed blood is temporarily stored in the lower part of the housing, and is led out from the bottom.

Conventionally, as mentioned above, since blood is stored in two blood storage tanks, the briming volume (blood filling amount) in the extracorporeal circulation circuit inevitably increases, leading to the problem of increasing the amount of blood transfused. was there. In order to solve such problems, the present inventors invented a blood reservoir with a specific structure by integrating two blood reservoirs, and previously filed a patent application No. 61-9355.
A patent application was filed as No. 3.

[Problems to be Solved by the Invention] Although the above blood storage tank achieved the intended purpose, it was found that there was a problem in which venous blood was more likely to foam at the inlet when the blood volume increased. did. The present invention has been made to solve such problems, and it is an object of the present invention to provide a blood reservoir that does not foam during venous blood flow.

[Means for Solving the Problems] The present invention solves the above problems by forming the venous blood flow inlet into a funnel shape and providing a rectifying member.

That is, the present invention provides a blood storage tank in which a filtration and defoaming part is provided in the upper part of the hollow housing and a blood storage part is provided in the lower part, and an intracardiac blood flow inlet is provided in the upper part of the housing, and a venous blood flow inlet and a blood outflow port are provided in the lower part of the housing. , a blood storage tank characterized in that the venous blood flow inlet is formed in the shape of a funnel, and a rectifying member is provided approximately in the center of the funnel-shaped portion.

[Function] In the blood storage tank of the present invention, by making the venous blood flow inlet funnel-shaped and providing the rectifying member, the blood is spread widely at the venous blood flow inlet and flows smoothly, thereby preventing spurting out. It is thought that the generation of bubbles is prevented because the bubbles disappear.

In order to prevent the generation of bubbles, simply making the venous blood flow inlet funnel-shaped has almost no effect, and a noticeable effect can only be obtained by providing a rectifying member, so it is thought that the two act synergistically. .

[Example code] Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the blood reservoir of the present invention. The blood storage tank is composed of an upper filtering and defoaming section 1 and a lower blood storage section 2, and the entire body is housed in a housing 4. The housing is preferably made of a transparent hard material (sealing material) so that the amount of blood stored can be confirmed from the outside.The upper part of the housing is provided with a centripetal blood flow port 5, and the lower part is provided with a venous blood flow port. Outflow population 19 and blood outflow port 22
is provided.

The filtration/defoaming part 1 housed and fixed in the upper part of the housing includes a cylindrical first defoaming member 10. It has a structure in which a second defoaming member 11 and a filtration member 9 are laminated, and intracardiac blood entering the device from 5 is introduced into the inside of the filtration and defoaming part through a cylindrical body 8. The cylindrical body 8 is for smoothly introducing blood into the filtration and defoaming section, and preferably has a smooth curved upper part. Defoaming members 10 and 11 are made of open-cell foam such as polyurethane coated with a defoaming agent, and member 11 has a smaller pore diameter than 10. Although intracardiac blood contains a large amount of air bubbles, the bubbles are defoamed by passing through the defoaming member, and the separated air is discharged from the first air vent lower. The filtration member 9 provided on the outside of the defoaming member is for removing minute tissue fragments and microaggregates contained in blood, and is a screen made of polyester, nylon, polypropylene, etc. with a pore size of 20 to 100μ. Filters are preferred. Furthermore, the filtration member also has the function of blocking minute air bubbles that have passed through the defoaming member, and coating with an antifoaming agent is preferable because the defoaming of the microbubbles becomes possible.

The filter member 9 has a pleated shape. In this embodiment, the filtration member is provided outside the defoaming member, but it may be provided inside the defoaming member.

In addition to the screen filter, a depth filter can also be used as the filter member, and it may not be pleated. Furthermore, the filter may have a single layer or multiple layers, and supporting members may be laminated.

The intracardiac blood that has passed through the filtration and defoaming section is guided by a guiding section 3 provided below the filtration and defoaming section, and reaches the blood storage section 2 . The guiding part 3 is composed of a cylindrical blood collecting part 14 with a part of the side surface (left side in the figure) missing, and a flow part 15. Blood collection section 14
is provided so as to surround the outer periphery of the lower part of the filtration and defoaming part, and the bottom part is inclined toward the flow part 15. That is, all the blood that has passed through the filtration and defoaming section flows toward the flow section 15 and flows from the flow section 15 to the constriction section 1 of the housing.
6, flows along the side wall and flows into the blood storage section. The constricted portion 16 is provided to prevent blood flowing down from the flow portion 15 from dripping, thereby preventing blood from re-foaming. In order to smooth the flow of blood, the flow section 15 and the constriction 16 are preferably formed with smooth curves, and the side surface of the housing below the constriction is preferably sloped.

Venous blood flows into the blood storage section 2 from the venous blood flow population 19 . The inflow port 19 is formed in a funnel shape, and a flow regulating member 20 is attached to the substantially center thereof via a support member 21. The lower part of the flow regulating member 20 is formed into an inverted conical shape so that blood can flow smoothly. Further, the support member 21 simply fixes the rectifying member 20,
Any structure may be used as long as it does not disturb the blood flow, but in the illustrated embodiment, six triangular plates are installed vertically.

Although foaming of venous blood is prevented as described above, since air bubbles may already be included in the venous blood before it flows in, the blood storage section also needs a function to remove air bubbles.

Therefore, in the illustrated embodiment, a partition wall 17 and a second air vent 6 are provided to surround the venous blood flow inlet.

That is, the air bubbles flowing in from the venous blood flow port 19 rise due to buoyancy and are prevented from flowing toward the blood outflow port by the partition wall 17, and pass through the air flow path 12 to the second air vent.
, is discharged from the opening 6. The air flow path 12 is vertically provided substantially in the center of the filtration/defoaming section, and is separated from the bubble defoaming section by a partition wall 13 . Note that the partition wall 13 has the role of not only ensuring an air flow path but also allowing intracardiac blood introduced from the partition wall 5 to flow smoothly along its outer surface.

Venous blood entering the blood reservoir from the venous blood flow population 19 flows through the septum 1
It passes through the circulation port 18 provided at the lower part of the cell wall 7, joins the intracardiac blood on the outside of the septum, passes around the septum, and enters the blood inlet port 2.
It is derived from 2.

Next, examples of three types of rectifying members 200 are shown in FIGS. 2A to 2C. As shown in the figure, it is preferable that the lower part of the rectifying member is formed into an inverted conical shape in order to enhance the rectifying effect. Also,
The position where the rectifying member is provided needs to be approximately at the center of the funnel-shaped venous blood flow inlet. If it is provided too far below the center, blood flow will be obstructed, and if it is provided too far above the center, the anti-foaming effect will be insufficient, which is not preferable.

Experimental Example The blood storage tank shown in FIG. 1 has an inner diameter of 4Q mm at the upper end.
At approximately the center of the funnel-shaped part of the venous blood flow inlet having a depth of 33 mm (7), there is a cone shaped like that shown in Fig. 2A, the diameter of the cone base is 11.0 mm, and the height of the cone is 2. ．． O
'mm, the height of the cylinder part is 4. Heparinized bovine blood was allowed to flow in from the venous blood flow inlet at a flow rate of 6β/min using a blood reservoir equipped with a rectifying member of 0 mm.

At this time, no bubbling of blood was observed, and it was confirmed that the blood reservoir of the present invention functions well. On the other hand, when the rectifying member was removed and bovine blood was allowed to flow at the same flow rate, intense foaming occurred. Further, a similar experiment was conducted with a flow regulating member provided at the top of the funnel-shaped portion, but foaming still occurred. As is clear from this result, it is important in the present invention to provide the flow regulating member approximately in the center of the funnel-shaped portion.

[Effects of the Invention] In the present invention, since intracardiac blood and venous blood are stored in one blood storage tank, the priming volume of blood can be reduced. Furthermore, since venous blood does not foam when flowing in, and intracardiac blood can be defoamed and filtered efficiently, it is functionally excellent as a blood storage tank.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a preferred embodiment of the blood reservoir of the present invention, and FIG. 2 is a front view of three types of embodiments of the rectifying member. 1. Filtration defoaming section 2. Blood storage part 5, core blood flow population 19. Venous blood flow inlet 20, rectifying member 22. Blood outlet Figure 1 Figure 2

Claims (2)

[Claims] (1) A blood storage tank having a filtration defoaming part provided in the upper part and a blood storage part provided in the lower part in the hollow body housing, an intracardiac blood flow inlet in the upper part of the housing, and a venous blood flow inlet and a blood outflow port in the lower part of the housing; A blood storage tank characterized in that a venous blood flow inlet is formed in the shape of a funnel, and a rectifying member is provided approximately in the center of the funnel-shaped part. (2) The blood reservoir according to claim 1, wherein the lower part of the flow regulating member is formed into an inverted conical shape.