JPH074031Y2 - Blood reservoir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a blood reservoir that constitutes an extracorporeal circulation device together with an artificial lung, a blood circuit, a pump, and the like, and stores blood.

[Prior Art] Conventionally, in the so-called open-face open heart surgery in which an internal lesion of the heart is operated under direct view, blood that enters and leaves the heart and lungs is temporarily blocked, and a roller pump provided outside the body during that time. An extracorporeal circulation device including an artificial lung and a blood circuit is used. This extracorporeal circulatory device, during intracardiac surgery, uses blood that recirculates from a vein as arterial blood in an artificial lung, and pumps this blood from the artery to the whole body by a roller pump.
While the heart and lungs lose their function, the living body theoretically keeps functioning almost normally.

The extracorporeal circulation device is provided with a blood reservoir that temporarily stores blood. In this blood reservoir, a storage space is formed by sealing the bottom of an annular gap formed by a cylindrical outer cylinder and an inner cylinder, and blood is supplied to the storage space from an opening provided in the inner cylinder. Then, the structure is such that it is stored for a predetermined time.

[Problems to be Solved by the Invention] By the way, the storage space needs to have a certain volume, and the outer cylinder needs a scale for visually confirming the level of the stored liquid surface. However, if the cross section of the storage space is increased to secure the volume, the change in the liquid level becomes slower and it becomes difficult to visually confirm. In addition, even if there is a certain amount of stored blood, if the liquid level is low, bubbles will flow out together with the blood from the blood outlet. Therefore, the minimum usable filling amount increases. On the other hand, in order to increase the change in the liquid level, or to reduce the blood storage volume to some extent, the liquid level rises and bubbles are less likely to flow out of the blood outlet together with blood. When the liquid level drops, the drop between the opening provided in the inner cylinder and the liquid level increases,
It causes the generation of bubbles. For this reason, it is necessary to strictly control the liquid level of the stored blood so that the liquid level does not drop.

This invention has been made in consideration of the above circumstances, and when the storage amount is reduced, the storage amount is easy to measure and blood does not bubble, and bubbles are less likely to flow out together with blood. It is intended to provide a blood reservoir.

[Means for Solving the Problem] A first invention is an annular shape formed by a cylindrical outer cylinder and an inner cylinder in a blood reservoir provided in an extracorporeal circulator during open heart surgery to store blood. A storage space is formed by sealing the lower end of the gap, and the inner cylinder is provided with an opening for feeding the blood supplied from the outside to the storage space, and the opening and the lower end of the storage space are provided. In order to remove bubbles contained in the blood flowing out from the opening and guide them to the lower end of the storage space, there is a large number of fine fluid passages including sponges, sponges, knitting layers, etc. The feature is that a foam material is provided.

A second invention is to reduce the cross section of the storage space in order to increase the displacement amount of the liquid level of the blood stored in the storage space, and to provide a scale on the outer cylinder for visually confirming the position of the liquid level. The feature is that it is provided in the vertical direction.

[Operation] According to the first invention, the blood supplied from the opening to the blood storage portion permeates the antifoaming material, the permeated blood is transmitted through the inside of the antifoaming material, and flows out from the bottom thereof. By doing
Even when the amount of blood stored in the blood storage unit is reduced, it is possible to store the blood in the blood storage unit without the generation of bubbles due to the blood flowing out of the defoaming material falling on the liquid surface of the stored blood.

According to the second invention, since the cross section of the storage space is small, the liquid level of the blood stored in the storage space is largely displaced, and the positional relationship with the scale provided in the vertical direction of the outer cylinder is accurate. Can be visually confirmed. Further, it is possible to supply a blood reservoir in which bubbles are less likely to flow out together with blood and which has a minimum minimum filling amount.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the blood reservoir of this embodiment, and reference numeral 1 is the main body of the blood reservoir. Usually this blood reservoir
Extracorporeal circulator (a device that temporarily substitutes the functions of the body's heart and lungs) for removing blood from the veins of the body, removing carbon dioxide from the blood, and supplying oxygen to the arteries of the body. Connected to the device) and used,
It is designed to store the blood circulating in the circuit of the extracorporeal circulation device during surgery.

The main body 1 is provided with a storage space 4 formed by sealing the lower end of the gap formed by the outer cylinder 2 and the inner cylinder 3. Further, an opening 5 is formed in the inner cylinder 3, and a volume regulating member 6 is fixed to the lower outer peripheral side of the opening 5 to reduce the cross-sectional area of the storage space 4. Then, on the substantially entire outer peripheral side of the inner cylinder 3 or the volume regulating member 6, there is provided a defoaming material 7 having a large number of fine fluid channels made of, for example, a sponge, a sponge body, and the like. A nylon tricot knitting layer 8 is provided on the surface as a cover for the defoaming material 7.

Further, the lower end of the storage space 4 is slightly inclined, and a blood outlet 9 for outflowing the blood stored in the storage space 4 is provided at the lowermost end of the lower end.

Reference numeral 10 is a blood inlet to which the blood circuit is connected. A flow path A is formed from the blood inlet 10 toward the center of the main body 1, and a blood temperature measuring port 11 is formed in the middle of the flow path A.
a, blood sampling port 11b is provided. A branch portion 12 is formed at the upper end of the flow path A, and a plurality of flow paths B, B leading to the opening 5 are radially formed from the branch portion 12.

A lid 13 is provided on the upper portion of the main body 1. This lid
13 includes a gas vent 14, which is an air vent for the storage space 4,
A rapid filling port 15 for filling a filling liquid such as Ringer's solution and blood, a suction blood inlet 16 for sucking and sending blood bleeding into the operative field during surgery by a pump, etc., feeding supplemental blood and drug solution, filling liquid An injection port 17 is provided for this. Then, the rapid filling port 15, the suction blood inlet 16, the injection port
Blood or drug solution filled from 17 and filling solution are
After gathering in the center of the upper part, flowing down, passing through the defoaming material 18 formed in a cylindrical shape to remove bubbles, the defoaming material 7 provided on the outside further penetrates into the storage space. It is designed to flow into the part 4. Also, this defoamer 18
The outer periphery of is surrounded by the screen filter 19.

As shown in FIG. 2, the outer peripheral surface portion of the main body 1 having the above-mentioned internal configuration is swung, for example, by sticking a sticker with a scale, as shown in FIG. 20 is for measuring the amount of blood stored in the storage space 4, and its interval is determined corresponding to the amount of displacement of the liquid surface per unit volume. That is, the main body 1
In the vertical direction of the, corresponding to the shape of the storage space portion 4,
The distance becomes wider as it approaches downward.

Next, the operation of the blood reservoir will be described. The blood removed from the patient flows in the blood circuit and flows into the flow path A from the blood inlet 10. Then, this blood is branched at the branch point 12 in the outer peripheral direction of the main body 1, flows through the flow paths B, B, and permeates the defoaming material 7 through the opening 5. The blood that has penetrated into the defoaming material 7 collects at the lower end while the bubbles are removed by passing through the inside, and gradually flows out from the nylon tricot knitting layer 8 to the outside and is stored in the storage space 4. The blood stored in the storage space portion 4 flows into the blood circuit from the blood outlet 9 and flows out to another device (for example, a blood pump, an artificial lung, a blood concentrating device, etc.) to be converted into arterial blood and supplied to the patient's artery. To be done.

Here, the blood bleeding in the surgical field is sucked by a pump or the like and supplied to the suctioned blood inlet 16. Further, when replenishing the filling liquid, the blood and the medicinal liquid, the filling liquid, the blood or the medicinal liquid is replenished from the injection port 17 and the quick filling port 15, respectively.

In this way, the replenished or supplied filling liquid, blood or chemical liquid flows down from the upper center of the main body 1,
The bubbles are removed by permeating the defoaming material 18, gradually flowing out from the surface of the screen filter 19, and the defoaming material 7 is removed.
The air bubbles are removed again. Then, it passes through the inside of the defoaming material 7 and gradually flows out from the surface of the nylon tricot knitting layer 8 near the liquid surface of the blood stored in the storage space 4, and is stored in the storage space 4.

Further, the amount of blood stored in the storage space 4 is measured by comparing the positions of the scales 20, 20, ... Swung around the outer periphery of the main body 1 with the liquid level of the stored blood.

Here, since the cross-sectional area of the storage space portion 4 is reduced by the volume regulating member 6 below the opening portion 5, the intervals between the scales 20, 20, ... Swung on the outer periphery of the main body 1 are widened. Therefore, when the amount of blood stored in the storage space 4 decreases and the position of the liquid surface is below the opening 5, the positions of the liquid surface and the scales 20, 20 ... It is possible to make a comparison, and it is possible to accurately measure the storage amount of blood stored in the storage space 4. Further, as a result, it is possible to replenish the storage space 4 with an appropriate amount of blood or drug solution, and it is possible to easily confirm the replenishment time. In addition, it is possible to supply a blood reservoir having a small minimum use filling amount in which bubbles do not easily flow out together with blood.

Further, there may be no defoaming material 7 in contact with the volume regulating member 6, that is, a state in which the volume regulating member 6 and the nylon tricot knitting layer 8 are in contact with each other.

Although the present embodiment describes the suction blood reservoir and the vein reservoir, the same applies to the case where only the suction blood reservoir is used and the case where only the vein reservoir is used.

In addition, the storage space portion 4 of the above-described embodiment includes the outer cylinder 2 and the inner cylinder 3.
Although it is an annular gap formed by, it is not limited to an annular shape and may have another shape.

[Effect of Device] According to this device, the following effects can be obtained.

． The blood that has flowed into the blood reservoir penetrates the defoaming material through the opening, gradually flows out from the lower vicinity while passing through the inside of the defoaming material, and is stored in the storage space part, so that The bubbles can be completely removed,
It is possible to prevent the generation of bubbles due to the fall of blood on the liquid surface of the stored blood, and therefore, it is possible to prevent the supply of blood mixed with air to the body, which can greatly enhance the safety. .

． Since the cross-sectional area of the storage space is smaller below the opening, it is possible to increase the change in the liquid level of the stored blood, and thus the scale corresponding to the displacement amount of the liquid level per unit volume. Can be widened.
This makes it possible to quickly and accurately visually check the stored amount of stored blood, and to easily and accurately check the amount and time of replenishment of blood or Ringer's solution to the blood reservoir. it can.

In addition, it is possible to supply a blood reservoir having a small minimum use filling amount in which bubbles do not easily flow out together with blood.

[Brief description of drawings]

1 and 2 are views for explaining an embodiment of the present invention. FIG. 1 is a longitudinal sectional view for explaining the structure of the blood reservoir of the embodiment, and FIG. 2 is a view of the blood reservoir of the embodiment. It is a side view which shows an external appearance. 1 ... Blood reservoir body, 2 ... Outer cylinder, 3 ... Inner cylinder, 4
…… Storage space, 5 …… Opening, 7 …… Defoaming material, 8 ……
Nylon tricot layer, 20 ... scale.

Claims (2)

[Scope of utility model registration request] 1. A blood reservoir provided in an extracorporeal circulation device for open heart surgery for storing blood, wherein a lower end portion of an annular gap formed by a cylindrical outer cylinder and an inner cylinder is sealed. A storage space part is provided, and the inner cylinder is provided with an opening for sending the blood supplied from the outside to the storage space part.
A sponge, a sponge body, and a knitting body are provided to guide the lower end of the storage space while removing air bubbles contained in blood flowing out from the opening over the opening and the lower end of the storage space. A blood reservoir provided with an antifoaming material having a large number of fine fluid channels made up of layers and the like. 2. A scale for reducing the cross-sectional area of the storage space portion so as to increase the displacement amount of the liquid surface of the blood stored in the storage space portion, and a scale for visually confirming the position of the liquid surface is provided on the outer cylinder. The blood reservoir according to claim 1, wherein the blood reservoir is provided in the vertical direction of the above.