JP2002035115A - Protector for blood-circuit pressure monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive protector for blood-circuit pressure monitor which does not cause leakage. SOLUTION: This protector 1 for blood-circuit pressure monitor which is loaded in the tube of a pressure monitoring line, namely, a tube 12 used for connecting a pressure gauge (not shown in the figure) to a drip chamber (not shown in the figure) is composed substantially of a gas-permeable and blood- impermeable porous material 11. The material 11 has a length of 0.5-100 mm in the longitudinal direction of the pressure monitoring line (tube 12).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protector used for a blood circuit pressure monitor in a treatment using an artificial organ such as an artificial kidney and an artificial heart-lung machine.

[0002]

2. Description of the Related Art Artificial kidneys used in blood purification therapy,
In treatment using various artificial organs such as heart-lung machine,
In order to lead blood to the extracorporeal blood circuit, it is essential to measure the pressure inside the blood circuit from the viewpoint of ensuring the safety of treatment and adjusting the treatment effect. The pressure inside the blood circuit is obtained by measuring the pressure transmitted to the air that comes into contact with blood in a drip chamber or the like with a pressure gauge connected through a tube. Normally, the pressure monitor line to which pressure is transmitted is filled only with air,
If an overpressure occurs in the blood circuit due to an increase in circulating blood flow, blood circuit, blood coagulation in the artificial kidney, etc., blood may enter this pressure monitor line, and when it reaches the pressure gauge, However, there is a problem that the pressure in the blood circuit cannot be measured accurately.
Another problem is that if blood or blood-derived substances that have penetrated into the pressure gauge flow backward, they may lead to an infection accident. Therefore, conventionally, FIG.
As shown in FIG. 5, a protector 9 in which a gas-permeable and liquid-impermeable membrane-type filter 91 having a thickness of about 100 μm is generally accommodated in a hard housing 92,
It was installed in the middle of the pressure monitor line.

[0003]

However, in order to eliminate the adverse effect of pressure loss during gas permeation, the membrane area of the membrane type filter must be considerably larger than the cross section of the pressure monitor line. Also, a large rigid housing for accommodating this is required, leading to an increase in cost. In addition, there is also a fear that leakage is easily caused when pressure is applied to the surface of the membrane type filter. An object of the present invention is to solve the above-mentioned problems and to provide a blood circuit pressure monitor protector that is inexpensive and does not leak.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, a pressure monitor line which is substantially gas-permeable and liquid-impermeable in place of a membrane filter has been proposed. It has been found that the above problems can be solved by adopting a porous body having a thickness of 0.5 to 100 mm in the longitudinal axis direction of the present invention, and the present invention has been achieved. That is, the present invention relates to a protector provided on a pressure monitor line for monitoring the pressure of a blood circuit, for preventing the pressure gauge from contacting the liquid, and having a zero in the longitudinal axis direction of the pressure monitor line. A blood circuit pressure monitor protector comprising a substantially gas permeable and liquid impermeable porous body having a thickness of 0.5 to 100 mm. Here, the porous body may be loaded in a tube of a pressure monitor line. Further, the porous body may be loaded into a relatively large-diameter tube, and a relatively small-diameter tube or connector may be inserted from both ends of the large-diameter tube. Further, the porous body may be housed in a rigid housing having connection portions at both ends.
Preferably, the porous body has hydrophobicity.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a tube of a pressure monitor line, that is, a tube 1 for connecting a pressure gauge (not shown) to a drip chamber (not shown).
2 is a blood circuit pressure monitor protector 1 that is loaded into the blood circuit pressure monitor protector 1 and is substantially composed of a gas-permeable and liquid-impermeable porous body 11. The porous body 11 has a thickness of 0.5 to 100 mm in the longitudinal axis direction of the pressure monitor line (tube 12).

The porous body 11 may be made of a hydrophobic material such as polyethylene, polypropylene, fluororesin or the like, but is not particularly limited thereto. And the like subjected to hydrophobic treatment. The porous body 11 of the present example has a diameter substantially equal to the inner diameter of the tube 12, and has a thickness of 0.5 to 100 mm in the longitudinal axis direction of the pressure monitor line. Porous body 11
If the thickness is 0.5 mm or more, there is no risk of leaking easily, and if it is 100 mm or less, there is no adverse effect on the pressure measured by the pressure gauge. In consideration of ease of manufacture, the thickness is preferably 0.5 to 50 mm. Further, the pore size of the porous body 11 is usually selected from 0.1 to 300 μm, and is appropriately determined according to the thickness. When the thickness of the porous body 11 is 100 mm, the pore size is preferably 300 μm, and the thickness is 0.5 μm.
In the case of mm, the pore size is preferably set to 0.1 μm.

In hemodialysis, the pump pulsates and blood circulates in the blood circuit, and the pressure in the drip chamber fluctuates at a substantially predetermined amplitude in accordance with the pulsation. The calculated average value is displayed. On the other hand, the thickness of the porous body 11 is 0.5 mm
And 100 mm, the pressure loss is different, and the pore size is 0.1 μm and 300 μm, the pressure loss is different, but this difference only affects the magnitude of the pressure fluctuation amplitude. . Therefore, when the thickness and the pore size of the porous body 11 are in the above ranges, the numerical values displayed by the pressure gauge are almost the same.

The tube 12 is a synthetic resin tube having an inner diameter of about 1 to 5 mm for connecting a pressure gauge (not shown) and a drip chamber (not shown). At one end of the tube 12, a connector 13 for connecting to a pressure gauge is provided. The other end of the tube 12 may be connected to the drip chamber via a connector (not shown) or may be directly connected to the drip chamber.

In this embodiment, the substantially gas-permeable and liquid-impermeable porous body 11 itself functions as the blood circuit pressure monitor protector 1. This porous body 11
Is usually a connector 13 for connecting to the pressure gauge (or tube 12 end if connector 13 is not required)
, But is not particularly limited to this position. With this configuration, almost no area is taken in the cross-sectional direction, and the device can be manufactured extremely inexpensively. At the time of production, the porous body 11 may be molded and then loaded into the tube 12. The porous body material is introduced into the tube 12, solidified, and then solidified.
1 may be formed.

In addition, the present invention uses a blood circuit pressure monitor protector 1 shown in FIG. 1 and a blood tube 22 having a relatively large tube 22 and a relatively small tube 23 as shown in FIG. Circuit pressure monitor protector 2
Can also be adopted. In the blood circuit pressure monitor protector 2, after the porous body 21 was loaded in the relatively large-diameter tube 22, the relatively small-diameter tube 23 and the connector 24 were fitted into both ends of the large-diameter tube 22. In addition to having the effect of being easy to manufacture, the small-diameter tube 23 and the connector 24 prevent the porous body 21 from moving even if a force that moves the porous body 21 in the longitudinal axis direction is applied. It also has the effect of being fixed. The small-diameter tube 23 may be changed to a connector.

Further, according to the present invention, as shown in FIGS. 3 and 4, the rigid housings 32 and 42 having tube connecting portions 321 and 421 at one end and pressure gauge connecting portions 322 and 422 at the other end. , The blood circuit pressure monitor protectors 3, 4 and the like in which the porous bodies 31, 41 are accommodated. In addition, a pressure gauge may be directly connected to the pressure gauge connection sections 322 and 422, or a pressure gauge may be connected via a tube.

[0012]

5. As shown in FIG. 5, by operating a pump 51, water stored in a tank 52 is supplied to the artificial kidney 5 by a pump.
3. A circulatory system was created that returned to the tank 52 through the drip chamber 54 again. The drip chamber 54 is connected to a pressure monitor line 6 provided with only a pressure gauge 61 without a protector, separately from a circulation system tube 55, and provided with a pressure gauge 71 and a conventional membrane protector 72. The pressure monitor line 7, the pressure gauge 81, and the pressure monitor line 8 provided with the blood circuit pressure monitor protector (porous body type protector 82) of the present invention were connected. As the porous body protector 82 of the present invention, a polyethylene sintered body (pore diameter 35 μm, 50 μm) having a thickness of 10 mm in the longitudinal direction of the pressure monitor line 8 was inserted into a tube. In addition, the membrane protector 72
Is made of polytetrafluoroethylene and has a thickness of 10
Those having a diameter of 0 μm and a pore diameter of 0.22 μm were employed. The pressure is adjusted by the clamp 56 and the pressure measured by the pressure gauge 61 of the pressure monitor line 6 is adjusted to 100 mmHg, 200 mmHg.
g, and the pressure measured by the pressure gauge 71 of the pressure monitor line 7 and the pressure measured by the pressure gauge 81 of the pressure monitor line 8 were compared (n = 3). Table 1 shows the results.

[0013]

[Table 1]

As can be seen from Table 1, it was confirmed that the pressure measured through the porous protector 82 of the present invention was equivalent to the pressure measured through the membrane protector 72.

[0015]

As described above, according to the present invention, a blood circuit pressure monitor protector that is inexpensive and free from leaks can be obtained. When the porous body is loaded into the tube, it is particularly advantageous in terms of cost and is easy to manufacture. Further, even in the case of being housed in a hard housing, there is no need to worry about displacement or breakage as in the case of the membrane type filter, so that the filter can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a blood circuit pressure monitor protector 1 of the present invention.
FIG.

FIG. 2 is a longitudinal sectional view showing another embodiment of the blood circuit pressure monitor protector of the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment of the blood circuit pressure monitor protector of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the blood circuit pressure monitor protector of the present invention.

FIG. 5 is an explanatory diagram of a circulating system created for comparing the pressure obtained through a blood circuit pressure monitor protector (porous body type protector) of the present invention and a conventional membrane type protector.

FIG. 6 is a longitudinal sectional view showing a conventional blood circuit pressure monitor protector.

[Explanation of symbols]

1, 2, 3, 4 Blood circuit pressure monitor protector 11, 21, 31, 41 Porous body 12 Tube 13, 24 Connector 22 Large-diameter tube 23 Small-diameter tube 32, 42 Hard housing 321, 421 Tube connection 322, 422 Pressure Meter connection unit 51 Pump 52 Tank 53 Artificial kidney 54 Drip chamber 55 Tube 56 Clamp 6, 7, 8 Pressure monitor line 61, 71, 81 Pressure gauge 72 Membrane protector 82 Porous body protector

Claims (5)

[Claims] 1. A protector provided on a pressure monitor line for monitoring the pressure of a blood circuit for preventing a liquid from coming into contact with a pressure gauge, wherein 0 is provided in a longitudinal direction of the pressure monitor line. A blood circuit pressure monitor protector comprising a substantially gas permeable and liquid impermeable porous body having a thickness of 0.5 to 100 mm. 2. The blood circuit pressure monitor protector according to claim 1, wherein the porous body is loaded in a tube of a pressure monitor line. 3. The blood according to claim 1, wherein the porous body is loaded in a relatively large-diameter tube, and a relatively small-diameter tube or connector is inserted from both ends of the large-diameter tube. Circuit pressure monitor protector. 4. The blood circuit pressure monitor protector according to claim 1, wherein the porous body is housed in a rigid housing having connection portions at both ends. 5. The porous body according to claim 1, wherein the porous body has hydrophobicity.
The blood circuit pressure monitor protector according to any one of the above.