JPS62258673A - Blood storage tank - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 an artificial lung by a blood pump, oxygenated, and returned to the patient. Generally, the former blood storage tank is
No. 139, No. 60-58159 and No. 60-10396
As disclosed in publications such as No. 8, 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.

[Problems to be Solved by the Invention] Conventionally, as mentioned above, blood is stored in two blood reservoirs, so the briming volume (blood filling volume) in the extracorporeal circulation circuit is inevitably large. There was a problem that this resulted in an increase in the amount of blood transfusion. The present invention has been made to solve this problem, and its object is to provide a functionally superior blood reservoir that requires less briming volume.

[Means for solving the problem] The above-mentioned object is achieved by integrating two blood reservoirs into a specific structure. That is, the present invention separates a cylindrical filtration and defoaming section at the top and a blood storage section at the bottom into a hollow body housing that has an intracardiac blood flow inlet in the upper part and a venous blood flow inlet and a blood outlet in the lower part. An air flow path that communicates with the blood storage section and an air vent provided above the housing and is isolated from the filtration and defoaming section is provided vertically at approximately the center of the filtration and defoaming section, and further passes through the filtration and defoaming section. This blood storage tank is characterized in that it is provided with a guiding part that guides the blood that has been collected to the blood storage part through the lower side wall of the housing.

[Function] In the blood storage tank of the present invention, intracardiac blood is supplied to the inside of the filtration/defoaming section from the inlet provided at the top, and foreign particles are removed while passing through the filtration/defoaming section and reaching the outside. It is removed and defoamed. The blood is then guided by the guiding part and passes along the lower side wall of the housing and enters the blood storage part. On the other hand, venous blood is guided directly to the blood storage section from the lower part of the blood storage tank. The air bubbles mixed in the venous blood pass through the air flow path provided inside the filtration and defoaming section and are discharged from the air vent port. The blood in the blood storage section is then led out from the blood outflow port.

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

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the blood storage tank of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. The blood storage tank includes a lower filtration and defoaming section 1 and a lower blood storage section 2.
The entire body is housed in a housing 4. The housing is preferably made of transparent hard resin so that the amount of blood stored can be checked 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 19 and a blood outflow port 21.

The filtration/defoaming unit 2, which is housed and fixed in the upper part of the housing, has a structure in which a cylindrical first defoaming member 1O1, a second defoaming member 11, and a filtering member 9 are laminated. The entered intracardiac blood passes through the cylindrical body 8 and is introduced into the inside of the filtering and defoaming section. 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 50μ. 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.

As is clear from FIG. 2, in the embodiment, the filter member 9 is pleated. 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 guide section 3 provided below the filtration and defoaming section, and reaches the blood storage section 2 . The guide section 3 is composed of a cylindrical blood collection section 14 with a missing side surface -B (on the left side in the figure) and a flow section 15. Blood collection section 14
is provided so as to surround the outer periphery of the lower part of the filtration/defoaming section, and the bottom part is inclined toward the flow section 15 = In other words, all the blood that has passed through the filtration/defoaming section flows toward the flow section 15. , the constriction part 1 of the housing from the downstream N15
6, flows along the side wall and flows into the blood storage section. The constricted portion 16 is provided to prevent the blood flowing down from the flow 915 from dripping as much as possible, thereby preventing blood from re-foaming. In order to smooth the flow of blood, the flow down B15 and the constriction 16 are preferably formed with smooth curves, and it is further preferable that the side surface of the housing below the constriction is sloped.

Venous blood flows into the blood storage 122 from the venous blood flow port 19, but air bubbles may also flow into the venous blood, and the blood storage section also needs a function to remove air bubbles. In order to achieve more complete separation of air bubbles, it is preferable that the venous blood inlet is provided vertically at the bottom of the housing, with the venous blood inlet port 18 protruding into the housing. And blood outflow port 21
Preferably, the venous blood flow inlet is provided at the bottom of the housing, and the venous blood flow inlet is provided above this. In the illustrated embodiment, a partition wall 17 is further provided around the protruding boat to improve bubble separation efficiency. That is, the air bubbles that flowed in from the inflow port 19 together with venous blood rise due to buoyancy, but by providing the upper end of the inflow boat 18 at a higher position than the flow port 20, the air bubbles are prevented from leaving the flow port along with the blood. The air bubbles are completely removed. The removed air bubbles pass through an air flow path 12 provided inside the filtration and defoaming section and are discharged from the second air vent port 6. The air flow path 12 is provided vertically approximately in the center of the filtration and defoaming section, and is connected to the partition wall 1.
3 separates it from the defoaming section. In addition, the partition wall 13
has the role of not only ensuring an air flow path but also allowing the intracardiac blood introduced from 5 to flow smoothly along its outer surface.

The venous blood that has passed through the flow port 20 at the bottom of the partition wall 17 flows around the partition wall together with the intracardiac blood that has flowed down through the guide portion, and is led out from the blood outflow port 21.

In the blood reservoir of the present invention, since some members are configured to have multiple functions, the structure is simple, and as a result, manufacturing is easy and economically advantageous. That is, the partition wall 13 has the role of forming an air flow path therein, causing intracardiac blood to flow down the outer surface, and preliminarily separating air bubbles. Further, the partition wall 17 has the role of removing air bubbles from venous blood and holding the filtration and defoaming section and the L1 guide section. Further, by guiding the blood flow down by the constriction 16 provided in the housing, a dedicated member for guiding the blood flow down can be omitted.

[Effects of the Invention] In the present invention, since intracardiac blood and venous blood are stored in one blood reservoir, the priming volume of the artificial heart-lung circuit can be reduced. In addition, it is capable of efficiently defoaming and filtering intracardiac blood and removing bubbles from venous blood, and is functionally excellent as a blood storage tank. Furthermore, since the structure is simple and the number of constituent members is small, it is easy to manufacture and economically advantageous.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a preferred embodiment of the blood reservoir of the present invention, and FIG. 2 is a cross-sectional view. 1. Filtration defoaming section 2. Blood storage part 3, guiding part 4. Housing 5, core blood flow population 6. Air vent port 12, air flow path 19. Venous blood flow population 21, blood outlet Figure 1 Figure 2

Claims (5)

[Claims] (1) In a hollow body housing having an intracardiac blood flow inlet at the upper part and a venous blood flow inlet and a blood outlet below,
A cylindrical filtration and defoaming section is provided above and a blood storage section is provided below, and an air flow path that communicates with the blood storage section and the air vent provided above the housing and is separated from the filtration and defoaming section is provided. What is claimed is: 1. A blood storage tank, characterized in that a guide part is provided vertically at substantially the center of the filtration and defoaming part, and further guides the blood that has passed through the filtration and defoaming part to the blood storage part along the lower side wall of the housing. (2) Claim 1, wherein the blood outflow port is provided at the lowest part of the housing, and the venous blood flow inlet is provided above this.
Blood reservoir as described in section. (3) The blood reservoir according to claim 1 or 2, wherein the venous blood flow inlet is vertically provided at the bottom of the housing and projects into the blood reservoir. (4) The blood storage tank according to any one of claims 1 to 3, wherein a partition is provided around the venous blood flow inlet, and a flow port is provided at the bottom of the partition. (5) The guiding part is provided to surround the lower part of the filtration and defoaming part, and a smooth constriction is provided in a part of the side wall of the housing, and the diameter is made slightly smaller below the constriction, so that blood is guided to the constriction part. Claims 1 to 1 consist of:
The blood reservoir according to any of paragraph 4.