JP2002282355A - Drip chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drip chamber with which blood is introduced from a side and foaming inside can be avoided. SOLUTION: In the drip chamber installed on the way of a blood circuit which treats blood by making blood to perform external circulation, a blood flow inlet is installed at a side face, a blood flow tube is installed at the blood flow inlet, and the end of the blood flow tube is positioned near the face of a wall to the degree that the blood flow goes to the lower position along with an opposite side wall of the blood flow inlet. The blood flow tube can remain to be sloped in the lower direction against the horizontal surface. The end surface of the blood flow tube can remain to be sloped in the lower direction against an axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip chamber installed in a blood circuit used for an artificial organ such as an artificial kidney, and more particularly, to inflow of blood from a blood flow tube provided on a side surface of the drip chamber. To the drip chamber.

[0002]

2. Description of the Related Art Conventionally, when blood is introduced into a drip chamber, the blood is introduced from above (for example, Japanese Utility Model 4-38).
No. 843), from the side (for example, Jitsuho 2-3)
Nos. 9465 and 39466). When blood is introduced into the drip chamber from above, the blood introduction tube is inverted by 180 degrees above the drip chamber. Since the blood introduction tube is soft, it is bent by the weight of the blood and the like, and there is a problem from the viewpoint of ensuring the safety of treatment by obstructing the blood flow. However, when blood is introduced from the side, the blood introduction tube only bends at 90 degrees, and the risk of stagnation of blood flow due to bending is low.

[0003]

However, since there is a distance from the blood inlet to the blood surface in each case, the inflowing blood scatters and foams when reaching the blood surface remaining in the lower part of the drip chamber. There was a problem. This foaming increases the chances of the blood coming into contact with the air, and some blood has a risk of promoting an increase in blood coagulation factors. In addition, the position of the blood surface could not be confirmed accurately due to the foaming, and it was difficult to adjust the position of the blood surface. An object of the present invention is to solve the above-mentioned problems and to provide a drip chamber capable of introducing blood from a side surface and preventing bubbling inside.

[0004]

Means for Solving the Problems According to the present invention for solving the above-mentioned problems, a blood inflow port is provided on a side surface of a drip chamber installed in a blood circuit for processing extracorporeally circulating blood. A blood flow tube is provided at the inlet, and the tip of the blood flow tube is located close to the wall so that the blood flow flows along the opposite side wall surface of the blood inlet. Features.

In the present invention, the blood flow tube is
It can be inclined downward with respect to the horizontal plane. Also,
The distal end surface of the blood flow tube may be inclined downward with respect to the axis.

[0006]

Embodiments of the present invention will be described below based on one embodiment shown in the drawings. In FIGS. 1 and 2, a drip chamber 1 is installed in a blood circuit for processing blood by circulating it extracorporeally. In the drip chamber 1, a cap 1b is attached to an upper portion of the main body 1a, and forms a cylindrical body as a whole. A blood outlet 1d is formed in the lower part of the main body 1a, a pressure monitor port 1e and an air vent 1f are provided in the cap 1b, and a pressure monitor tube 5 and an air vent tube 6 are connected to them. A filter 7 is arranged inside the main body 1a.

A blood inlet 1c is provided on the side surface of the cap 1b of the drip chamber, and a blood flow pipe 2 is provided through the inlet and on an extension of the blood inlet. Blood flow pipe 2 is made of a straight tubular part is inserted from the blood inlet 1c, so as to constitute a chord to the inner surface arc of the drip chamber 1, the center axis O ₂ is drip chamber 1 of the blood flow path pipe 2 It extends intersects the central axis O ₁ of the blood inflow tube 3 is connected to the terminal. The distal end of the blood flow tube 2 is located at an interval A on the wall so that the blood flows down along the opposite side wall of the blood inlet 1c. Further, the blood flow tube 2 is inclined downward with respect to a horizontal plane while maintaining an inclination angle B. Furthermore, the distal end surface of the blood flow pipe 2 is inclined while maintaining the inclination angle C downwards relative to its central axis O _2.

Next, an example of use of the drip chamber of the present invention will be described. After closing the blood outlet 1d, blood is introduced from the blood inlet 1c and is continuously filled until the blood surface comes to the upper and lower middle part inside the main body 1a. Air in the upper part inside the main body 1a and air bubbles generated during the outflow of blood are removed by the air vent tube 6. When the body is filled with an appropriate amount of blood, the blood outlet 1d is released, and the blood flows out and is circulated extracorporeally.

[0009] Here, the blood that has flowed out of the blood flow tube 2 reaches the wall surface on the opposite side of the blood inlet 1c, and flows down to the blood surface. Therefore, it is possible to suppress blood bubbling inside the drip chamber, and it is possible to reduce the risk of blood coagulation.

As shown in FIG. 3, the distal end of the blood flow tube 2 is provided such that the distance A from the wall surface on the opposite side of the blood inlet 1c to the drip chamber is in the range of 0 to 10 mm. In this range, the blood contact area on the wall surface is reduced due to an increase in the blood flow rate, and thus has an effect of reducing the chance of blood coagulation factors coming into contact with the wall surface.

As shown in FIG. 4, the blood flow tube 2 is
It can be inclined in the range of 10 to 60 degrees while maintaining the inclination angle B downward with respect to the horizontal plane. In this range, the distance from the distal end of the blood flow tube to the blood surface is shortened, and thus has an effect of suppressing foaming.

Further, as shown in FIG. 5, the distal end face of the blood flow tube is maintained at an inclination angle C with respect to the axis thereof at 20 to
It can be tilted in the range of 70 degrees. In this range, by reducing the pressure loss of the blood flowing into the drip chamber, the momentum of the blood inflow is suppressed, and the possibility of the blood coming into contact with the air and the wall surface and scattering can be reduced.

As shown in FIG. 6, the blood inflow tube 3 may pass through the drip chamber 1 and become the blood flow tube 2. Further, as shown in FIG. 7, the blood flow tube 2 may be formed of a bent cylindrical part. In this case, the center axis O ₂ at the distal end surface of the blood flow pipe 2, are inclined in the range of 10 to 60 degrees while maintaining the angle of inclination B downward with respect to the horizontal plane.

1 to 8, the blood flow pipe 2 is provided through the side of the cap 1b attached to the upper part of the main body 1a, but the cap 1b and the blood flow pipe are provided. 2 may be integrally formed.

[0015]

Embodiment 1 The drip chamber is shown in FIG.
It has the following dimensions corresponding to Cap inner diameter D₁Is 20m
m, body diameter D₂Is 18mm, from the bottom of the body to the bottom of the cap
Height H₁Is 150 mm from the bottom of the body to the blood flow tube.
Height H₂Is 130 mm, the height from the bottom of the body to the blood level
H₃Is 80 mm, the outer diameter d of the blood flow tube. ₁Is 7mm
Diameter d₂Is 5 mm, the length L of the drip chamber inner surface protruding is
17 mm, downward inclination angle C of the opening at the end face of the blood flow tube
Is 30 degrees, and the downward inclination angle B of the blood flow tube is 30 degrees.
there were.

In addition, the blood flow rate is 100 ml / min, 200 m
Bovine blood of 30% hemoglobin was flowed in at 1 / min and 300 ml / min, and the venous pressure was measured. Then, the distance A from the tip of the blood flow tube to the inner wall surface of the drip chamber is 0 to 0.
When changed to 10 mm, the state of bubbling of the blood surface remaining in the lower part of the drip chamber and the state of blood flow from the tip of the blood flow tube to the surface of blood remaining in the lower part of the drip chamber were examined. Table 1 shows the results.

Here, the blood flow condition was determined as follows. ◎ —Blood flows down with a small contact area with the inner wall surface of the drip chamber (the width of blood flow in contact with the inner wall surface is narrow). ○-The blood flows down by increasing the contact area with the inner wall surface of the drip chamber (the width of the blood flow in contact with the inner wall surface is wide). ×-Do not allow blood to come in contact with the drip chamber inner wall,
Drops directly on the blood surface that is stagnating at the bottom of the drip chamber.

[0018]

[Table 1]

As is clear from Table 1, in the drip chamber shown in FIG. 8, blood injected from the blood flow tube flowed down along the inner wall surface, and there was no bubbling on the blood surface.

[0020]

Embodiment 2 In the drip chamber shown in FIG. 8, a blood flow tube having a flat opening surface (C = 90 degrees) is installed horizontally (B = 0 degrees). The distance A to the inner wall surface of the drip chamber was changed from 0 to 10 mm, and the blood flow state and the presence or absence of bubbling at that time are shown in Table 2.

[0021]

[Table 2]

As is evident from Table 2, in a drip chamber in which a blood flow tube with a flat opening at the tip is installed horizontally, blood injected from the blood flow tube flows down along the inner wall surface. There was no foaming on the blood surface.

[0023]

Embodiment 3 In the drip chamber shown in FIG. 8, a blood flow pipe having a tip opening surface inclined downward (C = 30 °) is horizontally installed (B = 0 °). The distance A from the tip to the inner wall of the drip chamber is 0 to 10
mm, and the blood flow conditions and the presence or absence of bubbling at that time are shown in Table 3.

[0024]

[Table 3]

As is clear from Table 3, in a drip chamber in which a blood flow tube with a tip opening surface inclined downward is installed horizontally, the blood injected from the blood flow tube takes a distance from the inner wall surface. Is 10 mm, blood flow 1
At 00 ml / min, it fell directly onto the blood surface without touching the inner wall surface, but otherwise flowed down along the inner wall surface without foaming on the blood surface.

[0026]

Fourth Embodiment In the drip chamber shown in FIG. 8, a blood flow tube having a flat opening surface at its tip (C = 90 degrees) is set to be inclined downward (B = 30 degrees). Distance A from the tip of the drip chamber to the inner wall of the drip chamber is 0
Table 4 shows the blood flow condition and the presence or absence of bubbling at that time.

[0027]

[Table 4]

As is evident from Table 4, in a drip chamber in which the blood flow tube having a flat opening at the tip is inclined downward, blood injected from the blood flow tube flows down along the inner wall surface. There was no foaming on the blood side.

The present invention is not limited to the embodiments and embodiments described above, but includes various modifications without departing from the spirit and scope of the appended claims.

[0030]

According to the first aspect of the present invention, the blood flows down the inner wall surface of the drip chamber, so that the inflowing blood directly falls on the blood surface staying at the lower part of the drip chamber. Without blood splattering,
Blood bubbling inside the drip chamber can be suppressed, and the risk of blood coagulation can be reduced.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the blood flowing from the tip of the blood flow tube collides with the inner wall surface of the drip chamber as the blood flow rate increases, and the blood flows. It scatters above the position of the flow channel tube to prevent an increase in blood contact area on the inner wall surface. It reduces the chances of contact with blood and reduces the risk of blood clotting.

According to a third aspect of the present invention, in addition to the effects of the first and / or second aspects, the blood flowing into the drip chamber is provided because the distal end surface of the blood flow tube is inclined downward. The pressure loss of the blood can be reduced, the momentum of the blood flowing into the drip chamber from the blood flow path tube is suppressed, and the blood collides with the inner wall surface and scatters, preventing the blood contact area from becoming large, It reduces the risk of coagulation.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of one embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an explanatory view of an embodiment corresponding to FIG. 1;

FIG. 4 is an explanatory view of an embodiment corresponding to FIG. 1;

FIG. 5 is an explanatory view of an embodiment corresponding to FIG. 1;

FIG. 6 is a longitudinal sectional front view of another embodiment of the present invention.

FIG. 7 is a longitudinal sectional front view of still another embodiment of the present invention.

FIG. 8 is a vertical sectional front view for explaining the dimensions of one embodiment (experimental example) of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drip chamber 1a Main body 1b Cap 1c Blood inlet 1d Blood outlet 1e Pressure monitor port 1f Air vent 2 Blood flow pipe 3 Introducing tube 4 Outgoing tube 5 Pressure monitor tube 6 Air vent tube 7 Filter

Claims (3)

[Claims] In a drip chamber installed in a blood circuit for processing by circulating blood extracorporeally, a blood inlet is provided on a side surface, a blood flow pipe is provided at the blood inlet, and A drip chamber, wherein a tip of the blood flow tube is located close to the wall so that the blood flows along the side wall surface opposite to the blood inlet. 2. The drip chamber according to claim 1, wherein the blood flow pipe is inclined downward with respect to a horizontal plane. 3. The drip chamber according to claim 1, wherein a distal end surface of the blood flow tube is inclined downward with respect to an axis.