JPH06114103A - Chamber for blood circuit - Google Patents

Abstract

PURPOSE:To prevent the contact of the blood with the air layer in the upper space within a chamber for a blood circuit and to decrease the usage of the heparin to be injected into the blood by providing a floating cap within the cylindrical body of the chamber for the blood circuit provided with a blood inflow port and blood outflow port in the lower part of the cylindrical body. CONSTITUTION:The floating cap 56 provided freely movably upward and downward within the cylindrical body 43 is constituted by integrally molding a cap plate 57 having a diameter to the extent of forming a spacing in the inside wall of the cylindrical body 43 and a shaft cylinder 58 projecting upward from the central part. A wire 59 supporting the floating cap 56 is hung from the central part of the inside surface of an end plate 52 and is inserted in the shaft cylinder 58 to freely vertically movably hold the floating cap 56. The bottom end of the wire is provided with a stopper 60. The blood 61 admitted into the cylindrical body 43 from below by a pump pressure rises in the space 49 and bypasses the upper part of a partition wall 51. After the blood is filtered by a filter net 90, the blood flows out of the cylindrical body 43 from below. The floating cap 56 keeps floating while moving upward and downward on the liquid level to prevent the contact of the blood 61 with the air layer 64 in the upper space 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a blood circuit for artificial kidney,
The present invention relates to a blood circuit for an artificial liver and a chamber used for other blood circuits.

[0002]

2. Description of the Related Art At the time of hemodialysis, heparin is injected so that blood coagulation does not occur in a blood circuit, so that heparinized blood is sent into the body of a patient. Therefore, if the patient may injure or bleed after dialysis, the blood will not immediately clot, and immediately after dialysis, protamine will be injected into the patient to help heparinize the blood. Has been done. In addition, it has been reported that there have been cases of heparin allergy with the increase in long-term dialysis patients. Under such circumstances, there is a demand for a blood circuit that can reduce the amount of heparin used.

In a conventional blood circuit for an artificial kidney, as shown in FIG. 8, an arterial circuit 1 for extracting blood from a patient's vein and guiding it to a dialysis machine, and blood dialyzed through the dialysis machine to the patient's vein. The arterial chamber main body 3 and the venous chamber main body 4 are composed of the feeding venous circuit 2, and the dialysis device, blood pump, and
Suspend above the heparin infusion machine, patient, etc.,
Blood inflow tube 7 connected to chamber body 3
To the patient's artery via a needle 11 and connect the blood outflow tube 9 connected to the chamber body 3 to a connector 12
The blood inflow tube 8 connected to the inlet of the dialyzer via the connector, and the blood inflow tube 8 connected to the chamber body 4 to the outlet of the dialyzer via the connector 13, and the blood outflow tube 10 connected to the chamber body 4. It is used that is configured to connect to a patient's vein via needle 14.

[0004]

In the above-mentioned conventional artificial kidney blood circuit, blood inflow tubes 7 and 8 are connected to the upper ends of the chamber bodies 3 and 4, and blood outflow tubes 9 and 10 are connected to the lower ends of the chamber bodies 3 and 4. The one using the chamber connected to the above has a drawback in that blood is likely to be generated due to the impact because blood drops from above against the liquid surface in the chamber main bodies 3 and 4.

As an example of a device for solving this drawback, there is a device for connecting a blood inflow tube and a blood outflow tube to the lower end of a chamber body as described in Japanese Utility Model Publication 58-26655. In this device, since the blood inlet and the blood outlet are located below the liquid surface, it is possible to prevent the generation of bubbles in the chamber body, and when the bubbles are mixed from the outside, the floating direction of the bubbles is the inflow direction of the blood. Since they are aligned in the direction, there is an advantage that bubbles can be efficiently discharged to the air layer in the upper space in the chamber body. On the other hand, in the process of blood flowing from the inflow port to the outflow port in the chamber body, the liquid surface of the blood comes into contact with the air layer in the upper space in the chamber body, and blood coagulation easily occurs.

Therefore, it is also practiced to float the physiological saline solution on the surface of the blood in the chamber body to prevent the blood from coming into contact with the air layer in the upper space in the chamber body.
In this case, there are individual differences in the specific gravity of the blood, and unless saline that is lighter than that specific gravity is used, it mixes with the blood. There are drawbacks such as it is very troublesome to operate so that the saline solution floats on the liquid surface. The present invention is
It is an object of the present invention to provide a blood circuit chamber capable of eliminating the above-mentioned various drawbacks.

[0007]

To achieve the above object, the present invention provides a blood circuit chamber in which a blood inlet and a blood outlet are provided in a lower portion of a tubular body. It is characterized in that it is configured by providing a floating lid inside.

[0008]

In the chamber for a blood circuit having the above-described structure, in the process in which blood flows from the blood inlet to the blood outlet in the chamber main body, the floating lid always keeps floating on the liquid surface, and the liquid surface is kept in the chamber. Prevents contact with the air space above the body. In addition, when air bubbles are mixed in the blood,
When flowing into the chamber body, the bubbles rise along with the blood flow and are discharged to the air layer above the floating lid through the gap between the floating lid and the chamber body. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In FIG. 1, reference numeral 15 represents an arterial circuit of a blood circuit for an artificial kidney, which is an arterial chamber 16.
A blood inlet 17 and a blood outlet 18 at the lower end of
A suspension ring 19, a level adjustment line 20, and a pressure monitor line 21 are connected to the upper end, one end of a blood inflow tube 22 is connected to the blood inflow port 17, and a blood outflow tube 23 is connected to the blood outflow port 18. Connect one end of the tube 2
At the other end of 2, the shunt joint 2 for attaching the needle 23
4 and the connector 25 for connecting to the inlet of the dialysis machine is connected to the other end of the tube 23.
A pump action tube 26 pressed by a blood pump, a replacement fluid line 27, a heparin line 28, and a blood collection and mixed injection rubber tube 29 are connected in the middle of the process.

In FIG. 1, reference numeral 30 denotes a venous circuit of a blood circuit for an artificial kidney, which is provided with a blood inlet 32 and a blood outlet 33 at a lower end of a vein chamber 31 and a hanging ring 34 at an upper end. The level adjustment line 35 and the pressure monitor line 36 are connected to each other, one end of a blood inflow tube 37 is connected to the blood inflow port 32, and one end of a blood outflow tube 38 is connected to the blood outflow port 33. At the other end of 37 is a connector 39 for connecting to the outlet of the dialysis machine.
, A shunt joint 41 for attaching the needle 40 is connected to the other end of the tube 38, and a blood collection and mixed injection rubber tube 42 is connected in the middle of the tube 38.

2 and 3, the arterial chamber 16 is shown.
An example of the vein chamber 31 is shown. The description will be made with reference to 43. The reference numeral 43 denotes a tubular body, 44 denotes an end plate for liquid-tightly closing the lower end of the tubular body 43, and the outer surface of An inflow port 45 and a blood outflow port 46 are provided to connect a blood inflow tube 47 and a blood outflow tube 48, respectively, and the inner surface of the end plate 44 reaches an appropriate height from the lower end of the tubular main body 43. A space 49 communicating the space with the blood inlet 45,
Partition wall 5 which is divided into a space 50 communicating with the blood outlet 46
1 is provided. Reference numeral 89 is a blood discharge pipe provided so as to project from the inner surface of the end plate 44 so as to communicate with the blood outlet 46, and 90 is a filter net 9 covering the blood discharge pipe 89.
0, when the tubular body 43 is used as the tubular body of the arterial chamber 16, the blood drainage pipe 89 and the filter mesh 9 are used.
Sometimes 0 is omitted. Reference numeral 52 is an end plate that liquid-tightly closes the upper end of the cylindrical main body 43, and the level adjustment line 20,
A connection port 53 of 35 and a connection port 54 of the pressure monitor lines 21 and 36 are provided, and a suspension ring 55 is connected. Reference numeral 56 denotes a floating lid provided in the cylindrical main body 43 so as to be able to move up and down. The floating lid 56 is made of an anticoagulant material such as silicon or Teflon, and has a diameter such that a gap is formed between the inner wall of the cylindrical main body 43. A lid plate 57 having a groove and a shaft cylinder 58 projecting upward from its center are integrally formed. 59 is a floating lid 56
A wire for supporting the floating plate 56 is hung from the center of the inner surface of the end plate 52 and inserted into the shaft cylinder 58 to support the floating lid 56 so that the floating lid 56 can move up and down. A stopper 60 for receiving the floating lid 56 is provided at the lower end. .

In this embodiment, the blood 61 flowing from below into the tubular main body 43 through the blood inflow tube 47 by the pump pressure rises in the space 49 and bypasses the upper part of the partition wall 51 to bypass the filter mesh. Blood drain pipe 8 after being filtered at 90
9 and flows out from below the tubular body 43 through the blood outflow tube 48. In the process, the floating lid 56 moves to the liquid surface 6
2 keeps ascending and descending according to the displacement and continues to float to prevent the blood 61 from touching the air layer 64 in the upper space 63 in the tubular body 43. The blood 6 that has flowed into the tubular body 43
When air bubbles are mixed in 1, the air bubbles are carried to the upper side of the cylindrical main body 43 by the ascending flow of the blood 61, and the blood 61
In the process of bypassing above the partition wall 51, all of the bubbles pass through the gap between the inner wall of the tubular body 43 and the floating lid 56 and are discharged into the air layer 64, so that they flow out from the tubular body 43. The bubbles do not mix with the blood 61 to be discharged.

In the above embodiment, the partition wall 51 may be formed such that the lower end portion is thicker and gradually becomes thinner toward the upper end as shown in FIG. 2, and the upper and lower ends have the same thickness. It may be molded as follows. Also, the partition wall 51
Both side surfaces may be formed into a flat surface or may be formed into a concave surface. Further, as shown in FIG. 3, the partition wall 51 has a gap 6 between both side edges 65, 66 and the inner wall of the cylindrical main body 43.
7, 68, or both side edges 65,
A gap 6 is formed between either one of the 66 and the inner wall of the tubular main body 43.
7 or 68, and when blood 61 remaining in the tubular body 43 is returned to the patient's body after dialysis is completed, the blood in the space 49 can be simply tilted. 61 may be configured to be easily recovered in the space 50, or the side walls 65 and 66 of the partition wall 51 may be formed so as to be in close contact with the inner wall of the cylindrical main body 43 by omitting the gaps 67 and 68. is there. The blood inflow port 45 and the blood outflow port 46 may be formed with tapers 69 and 70 as shown in FIG. 2 in order to prevent the blood 61 from remaining on the inner edges thereof. Further, the diameter of the blood inflow port 45 is formed smaller than that of the blood outflow port 46 to increase the inflow speed of the blood 61 and decrease the outflow speed, and when bubbles are mixed in the inflow blood, the In some cases, it may be easier to send the air to the air layer 64 in the body 43.

4 and 5 show another embodiment of the arterial chamber 16 and the venous chamber 31. In this embodiment, instead of the partition wall 51 in the above-mentioned embodiment, a superior blood filtering performance is obtained. Since a double filter is provided and the other parts are configured in the same manner as in the above-described embodiment, the configuration related to the double filter will be described. 71 is fixed so as to stand upright from the inner surface of the end plate 44. With a double filter
This is because both ends of the upper frame plate 72 and the lower frame plate 73 are vertical frame plates 74,
A partition wall 78 is provided for partitioning the space enclosed by these frame plates into left and right individual chambers 76, 77, respectively, at both sides of the partition wall 78 of the lower frame plate 73. A through hole 79 that communicates with the individual chamber 76 and a through hole 80 that communicates with the blood outlet 46 and the individual chamber 77 are provided.
6, 77 are provided with openings 81, 82, and filtration meshes 83, 84 are stretched over the openings 81, 82, respectively. 8
Reference numeral 5 denotes a groove formed on the inner surface of the end plate 44 so as to surround the blood inlet 45 and the blood outlet 46 and to which the lower frame plate 73 can be fitted. The lower frame plate 73 is fixedly fitted in the groove 85. By doing so, the double filter 71 is erected from the inner surface of the end plate 44.

In this embodiment, the blood 61 passes through the blood inflow tube 47, the blood inflow port 45, the through hole 79, the private chamber 76, and the filter net 83 in this order, and is filtered by the filter net 83 to be stored in the tubular body 43. Flow into the liquid surface 62 and the floating lid 56
Emerges. The blood 61 that has flowed into the tubular main body 43 as described above is filtered again by the filter net 84, and then the private chamber 77,
It passes through the through hole 79, the blood outlet 46, and the blood outflow tube 48 in this order, and flows out of the cylindrical main body 43.

The present invention is not limited to the above-mentioned embodiments, but may be implemented as a blood circuit for an artificial liver or a chamber for other blood circuits. The floating lid 56 may be formed of various materials other than the anticoagulant material. Further, the floating lid 56 may be supported so as to be able to move up and down by inserting a thread suspended from the end plate 52 into the floating lid 56 or by tying it to the floating lid 56, instead of supporting the floating lid 56 so as to be able to move up and down. Alternatively, it may be simply inserted vertically into the tubular body without being supported by any supporting portion, or as shown in FIG. 6, the tubular body 43 may be provided with an enlarged diameter portion 86 in which the inner wall of the upper portion is enlarged. The floating lid 5 is provided on the expanded diameter portion 86.
6 may be fitted to support the floating lid 56 so as to be able to move up and down, or as shown in FIG. 7, guide rails 87, 87 that are perpendicular to the inner surface of the upper portion of the cylindrical main body 43 are provided. 87, 87 engaging recesses 8 provided on the floating lid 56
The floating lid 56 may be supported so as to be able to move up and down by engaging with 8, 88 or the engaging holes, or may be supported so as to be able to move up and down by various other means.

[0017]

Since the present invention is constructed as described above,
The floating lid always floats on the surface of the blood flowing from the lower blood inlet into the tubular body and flowing toward the lower blood outlet, so that the blood is deposited in the air space in the upper space inside the tubular body. In order to prevent the touch, it is easy to use and the blood can flow in the tubular body without touching the air layer. Moreover, it is possible to prevent the formation of bubbles in the tubular body, and when bubbles come into the blood from the outside, carry all of the bubbles to the liquid surface by the upward flow of blood, and It can be discharged to the air layer through the gap between the inner wall of the and the floating lid. Therefore, there is almost no risk of blood coagulation in the chamber body during use of the blood circuit, and therefore, compared to the conventional blood circuit chamber, the amount of heparin used can be extremely reduced, and the occurrence of heparin allergy can be prevented. A blood circuit chamber that can be prevented can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory view of a blood circuit for artificial kidney in which a chamber for blood circuit according to the present invention is incorporated.

FIG. 2 is a sectional view showing an example of a blood circuit chamber according to the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view showing another example of the blood circuit chamber according to the present invention.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a diagram illustrating a modified example of a support portion of a floating lid.

FIG. 7 is a diagram illustrating still another modification of the support portion of the floating lid.

FIG. 8 is an explanatory diagram of a blood circuit for an artificial kidney in which a conventional blood circuit chamber is incorporated.

[Explanation of symbols]

43 ... Cylindrical body, 45 ... Blood inlet, 46 ... Blood outlet, 56 ... Float.

Claims (2)

[Claims] 1. A blood circuit chamber in which a blood inlet and a blood outlet are provided in a lower portion of a tubular body, wherein a floating lid is provided inside the tubular body. 2. The blood circuit chamber according to claim 1, wherein a support portion that supports the floating lid so as to be able to move up and down is provided inside the tubular main body.