JPH11197238A - Tube for extracorporeal circulation circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube for an extracorporeal circulation circuit, which is capable of surely preventing the closing of the extracorporeal circulation circuit caused by the breaking of the tube, easily produced and easily connected to each part of the extracorporeal circulation circuit. SOLUTION: In a tube for extracorporeal circulation circuit, which is made of a synthetic resin material and provided with a tube path 2 for liquid circulation, a thick part 4 is formed along the longitudinal direction of the tube in a tube peripheral wall part 3 formed around the tube path 2, and accordingly, the outer shape of a tube cross section is formed roughly elliptic. The thick part 4 is formed in the bending direction of the tube, and the near center part thereof is set harder than the other parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a tube for an extracorporeal circulation circuit used for treatment of extracorporeal circulation such as dialysis.
In particular, the present invention relates to a tube for an extracorporeal circuit that can reliably prevent the extracorporeal circuit from being blocked due to a broken tube.

[0002]

2. Description of the Related Art Generally, a tube used for an extracorporeal circuit is formed of a synthetic resin material (a soft polymer material) such as vinyl chloride, which can be bent to a certain degree due to a property set in a dialysis device or the like. Have been. For this reason, when the bending angle is increased, the tube is bent, and the extracorporeal circulation circuit is closed at the bent portion, making it impossible to treat the extracorporeal circulation.

Therefore, conventionally, in order to prevent such a tube from being broken, a thick tube is used or a tube is reinforced on the outer surface side of the tube as disclosed in Japanese Patent Application Laid-Open No. 7-59857. A tube in which a projection is spirally wound as a member has been proposed.

[0004]

However, when a thick tube is used, the amount of synthetic resin material to be used increases and the material cost increases, and the used tube is discarded by incineration or the like. There is a problem that the disposal cost at the time of processing increases and the cost tends to be high as a whole.

Further, in the tube disclosed in Japanese Patent Application Laid-Open No. 7-59857, since there is a helical projection on the outer surface of the tube, the outer surface of the tube and the inner surface of each component of the extracorporeal circuit are not connected. The connection between the tube and each component of the extracorporeal circulation circuit tends to be troublesome, for example, the connection with each component is made using the inner surface of the tube, and the components that can be connected are specified. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the invention described in claims 1 to 3 is to reliably prevent the extracorporeal circulation circuit from being clogged by a broken tube and to form it at low cost. Another object of the present invention is to provide a tube for an extracorporeal circuit that can be easily connected to parts of the extracorporeal circuit.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a tube for an extracorporeal circulation circuit which is formed of a synthetic resin material and has a liquid circulation line therein. Wherein a thick wall portion is formed along a longitudinal direction of the tube on a peripheral wall portion of the tube formed around the conduit, whereby the outer shape of the cross section of the tube is formed to be substantially elliptical. And

With this configuration, when the tube is bent, for example, in a state where the tube is connected to each component of the extracorporeal circuit, the meat formed along the longitudinal direction of the tube on the peripheral wall around the conduit. The thick portion reliably prevents the obstruction of the conduit due to the breakage of the tube, that is, the obstruction of the extracorporeal circulation circuit. In addition, it is not necessary to form the entire peripheral wall of the tube around the pipe wall with a large wall thickness, thereby reducing material costs and disposal costs and obtaining an inexpensive tube as a whole. Since it is formed and has no protrusion on the outer surface, connection with each component of the extracorporeal circuit is facilitated.

Further, the invention according to claim 2 is characterized in that the thick portion is formed in the bending direction of the tube.
With this configuration, for example, if the thick portion of the tube is positioned inside or outside in the bending direction and connected to each component of the extracorporeal circuit, the tube in use can be more prevented from being broken, and extracorporeal circulation can be prevented. Blockage of the circuit can be prevented more reliably.

[0010] The invention according to claim 3 is characterized in that the hardness of the substantially central portion of the thick portion is set to be harder than the other portions. With such a configuration, the hard portion provided at the substantially central portion of the thick portion can further prevent the tube from breaking, and can more reliably prevent the extracorporeal circulation circuit from being blocked.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a tube for an extracorporeal circulation circuit according to the present invention. FIG. 1 is a perspective view, FIG. 2 is a sectional view thereof, and FIG. 3 is a partially cutaway side view.

In FIG. 1 to FIG. 3, a tube 1 is formed of a synthetic resin material such as vinyl chloride, and a tube 2 having an inner diameter r1 capable of forming a circulation circuit of an extracorporeal circulation circuit (not shown) is provided therein. Is formed. The peripheral wall portion 3 formed around the pipe 2 is a left and right portion 3 in FIG.
The thicknesses t1 and t2 of the a and 3b and the thickness t4 of the lower portion 3d are set to be the same, and the thickness t3 of the upper portion 3c is set to the thicknesses t1 and t2.
It is set larger than t4, that is, t1 = t2 = t4 <t3.

As a result, a thick portion 4 is formed in the upper portion 3c of the peripheral wall portion 3, and the center O of the conduit 2 is eccentric toward the lower portion 3d with respect to the outer shape of the cross section of the tube 1, and the cross section of the tube 1 Is formed in a semi-circular shape having an outer diameter r2 from the left portion 3a to the lower portion 3d and the right portion 3b, and is formed in a semi-elliptical shape from the left portion 3a to the upper portion 3c and the right portion 3b, and as a whole is substantially elliptical. It has a shape. It is preferable that the radius of curvature r3 of the outer shape in the vicinity of the upper portion 3c be 0.35 times or more the outer diameter r2. This is because if the radius of curvature is equal to or larger than the above, even if the tube 1 is bent with the thick part 4 inside, the thick part 4 is inverted and becomes outside, so that the blockage of the pipe line 2 can be prevented. is there.

[0014]

Next, the present invention will be described more specifically with reference to examples.

Embodiment 1 Embodiment 1 has a shape shown in FIGS. 1 to 3 and has an inner diameter r1 = 3.
4 mm, outer diameter r2 = 5.1 mm, t1 = t2 = t4 =
A PVC tube of 0.85 mm and t3 = 1.3 mm was manufactured. Then, as shown in FIG. 4, three vertices A,
A vertex C of an isosceles triangle (a = b = c) having B and C is a bent portion, and the thick portion 4 is positioned inside (or outside) in the bending direction A as shown in FIG. Tube 1
When the bending test was carried out, no blockage of the pipe line 2 due to the bending of the bent portion 5 of the tube 1 occurred until a + b = 8 mm.

Comparative Example 1 In Comparative Example 1, the inner diameter r1 was 3.4 mm and the outer diameter r2 was 5.1.
When a constant PVC tube having a thickness of 0.85 mm and a thickness of 0.85 mm was manufactured and subjected to the same bending test as in Example 1, a +
At b = 25 mm, a pipe blockage occurred due to a break in the bent portion of the tube.

As is clear from the bending test results,
According to the tube 1 of Example 1, even if the a + b dimension is bent to a position of 8 mm, no occlusion of the conduit 2 (occlusion of the extracorporeal circulation circuit) occurs, whereas in Comparative Example 1, a +
When the dimension b is 25 mm, the pipeline is closed. That is, the tube 1 of Example 1 does not block the pipe line 2 even when bent to an angle at which the bending angle α (see FIG. 4) becomes approximately three times smaller than that of the tube of Comparative Example 1. On the other hand, it is possible to obtain the tube 1 in which the pipeline is not easily blocked.

As described above, in the tube 1 of the above embodiment, the upper portion 3c of the peripheral wall 3 formed around the conduit 2
In addition, since the thickness t3 forms the thicker portion 4 than the other portions, even if the tube 1 is bent to a position where the bending angle α becomes a predetermined value, for example, the tube 1 is bent. 2 is prevented, and the bending angle α of the tube 1 in which the pipe 2 is closed can be significantly reduced as compared with the related art. As a result, the thick portion 4 is connected to each part of the extracorporeal circuit by setting the thick portion 4 to the inside or outside in the bending direction A, so that the tube 2 is blocked due to the bend (bending) of the tube 1 during use of the extracorporeal circuit. Effective measures for preventing the tube 1 from breaking, such as reliable prevention, can be obtained.

Further, since the thick portion 4 is formed only on the upper portion 3c of the peripheral wall 3 of the tube 1, the use of the synthetic resin material to be used is smaller than when the entire peripheral wall 3 is formed thick. The amount can be reduced, and the disposal cost when performing disposal treatment such as incineration of the used tube 1 can be reduced, so that an inexpensive tube 1 can be obtained as a whole.

Further, the outer shape of the cross section of the tube 1 is formed to be substantially elliptical and no projections are provided on the outer surface. The tube 1 is made of a soft material such as vinyl chloride, and extracorporeal circulation. The other components of the circuit are also made of a soft material and can be slightly deformed at the time of fitting. Therefore, if the positioning with the tube 1 can be performed to some extent, the tube may deform and adapt. Of the extracorporeal circulation circuit to the inner surface of the
Each part can be fitted to the outer peripheral surface of the body, and connection with each part of the extracorporeal circuit can be easily performed.

FIG. 5 is a sectional view similar to FIG. 2 showing another example of the tube according to the present invention. The feature of the tube 11 is that a high hardness portion 12 is provided at a substantially central portion of the thick portion 4. The other configuration is the same as that of the tube 1 described above, and thus the same reference numerals are given and the detailed description is omitted.

The high hardness portion 12 is formed, for example, by molding the peripheral wall 3
This is performed by integrally molding a synthetic resin material that is harder than the synthetic resin material forming the above, or by insert-molding a rod-shaped member or the like that is formed in advance of a material that is harder than the synthetic resin material of the tube 11. Also in the tube 11, the thick portion 4 prevents the pipe line 2 from being blocked by bending (bending), and the high hardness portion 1 provided in the thick portion 4 is also provided.
2, the tube 11 becomes stronger against bending, and a more effective anti-bending measure can be obtained.

The external shapes of the tubes 1 and 11 exemplified above, the thickness and material of the peripheral wall portion 3, and the size and position of the high hardness portion 12 are merely examples, and do not depart from the gist of the present invention. It goes without saying that various changes can be made in.

[0024]

As described above in detail, according to the first aspect of the present invention, the tube is provided along the longitudinal direction on the peripheral wall around the pipe, and the outer shape of the cross section of the tube is substantially elliptical. With the thick portion, the blockage of the extracorporeal circuit caused by the tube break can be reliably prevented, and an effective break prevention measure can be obtained. In addition, since the thick portion is provided on a part of the peripheral wall portion, material costs and disposal costs can be reduced, and an inexpensive tube can be obtained. Since there is no protrusion on the outer surface, connection with each component in the extracorporeal circulation circuit can be easily performed.

In particular, by providing a thick portion in the bending direction as in the invention of claim 2, or by providing a hard portion at a substantially central portion of the thick portion as in the invention of claim 3, The effect is obtained that the blockage of the extracorporeal circulation circuit due to the bending of the tube can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tube for an extracorporeal circuit according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a side view partially broken away.

FIG. 4 is an explanatory view of the bending test method.

FIG. 5 is a sectional view similar to FIG. 2, showing a tube of another extracorporeal circuit according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 tube 2 pipe 3 peripheral wall 3a left 3b right 3c upper 3d lower 4 thick part 5 bent part 11 tube 12 high hardness part t1 to t4 thickness r1 inner diameter r2 outer diameter r3 radius of curvature α near upper part 3c Bending angle O Center

Claims (3)

[Claims] 1. A tube for an extracorporeal circuit, which is formed of a synthetic resin material and has a liquid circulation conduit therein, wherein a tube formed around the conduit has a peripheral wall portion,
A tube for an extracorporeal circulation circuit, wherein a thick section is formed along a longitudinal direction of the tube so that an outer shape of a cross section of the tube is formed to be substantially elliptical. 2. The tube for an extracorporeal circuit according to claim 1, wherein the thick portion is formed in a bending direction of the tube. 3. The tube for an extracorporeal circuit according to claim 1, wherein a hardness of a substantially central portion of the thick portion is set to be harder than other portions.