JP4117670B2 - Blood circuit pressure monitor protector - Google Patents

Description

【００１４】
表１から分かるように、本発明の多孔質体型プロテクター８２を通して測定した圧力は、膜型プロテクター７２を通して測定した圧力と同等の値を示すことが確認された。
【００１５】
【発明の効果】
以上述べたように本発明によれば、安価、かつ、リークするおそれのない血液回路圧力モニタープロテクターが得られる。そして、多孔質体をチューブに装填する場合は、特にコスト的に有利であり、製造も容易である。また、硬質ハウジングに収容する場合でも、膜型のフィルターのようにズレや折れなどを気にする必要がないので、容易に製造することができる。
【図面の簡単な説明】
【図１】本発明の血液回路圧力モニタープロテクター１の縦断面図である。
【図２】本発明の血液回路圧力モニタープロテクターの他の実施例を示す縦断面図である。
【図３】本発明の血液回路圧力モニタープロテクターの他の実施例を示す縦断面図である。
【図４】本発明の血液回路圧力モニタープロテクターの他の実施例を示す縦断面図である。
【図５】本発明の血液回路圧力モニタープロテクター（多孔質体型プロテクター）と従来の膜型プロテクターを通して得られる圧力を比較するために作成した循環系の説明図である。
【図６】従来の血液回路圧力モニタープロテクターを示す縦断面図である。
【符号の説明】
１、２、３、４ 血液回路圧力モニタープロテクター
１１、２１、３１、４１ 多孔質体
１２ チューブ
１３、２４ コネクター
２２ 大径チューブ
２３ 小径チューブ
３２、４２ 硬質ハウジング
３２１、４２１ チューブ接続部
３２２、４２２ 圧力計接続部
５１ ポンプ
５２ タンク
５３ 人工腎臓
５４ ドリップチャンバー
５５ チューブ
５６ クランプ
６、７、８ 圧力モニターライン
６１、７１、８１ 圧力計
７２ 膜型プロテクター
８２ 多孔質体型プロテクター[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protector used for a blood circuit pressure monitor in treatment using an artificial organ such as an artificial kidney or an artificial heart-lung machine.
[0002]
[Prior art]
In the treatment using various artificial organs such as artificial kidneys and heart-lung machines used in blood purification therapy, blood is led out to the blood circuit outside the body, so that the safety of the treatment and the adjustment of the therapeutic effect are considered. It is essential to measure the pressure inside the blood circuit. The pressure inside the blood circuit is obtained by measuring the pressure transmitted to the air in 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, but if overpressure occurs inside the blood circuit due to increased circulating blood flow, blood circuit, blood coagulation in the artificial kidney, etc. There is a problem that blood may enter the pressure monitor line, and if it reaches the pressure gauge, the pressure in the blood circuit cannot be measured accurately. In addition, if blood or blood-derived substances that have entered the pressure gauge later flow backward, there is a problem that an infection accident may occur.
Therefore, conventionally, as shown in FIG. 6, a protector 9 in which a gas-permeable and liquid-impermeable membrane filter 91 having a thickness of about 100 μm is housed in a hard housing 92 is provided in the middle of the pressure monitor line. It was installed in.
[0003]
[Problems to be solved by the invention]
However, in order to eliminate the adverse effect of pressure loss during gas permeation, the membrane type filter must have a considerably larger membrane area than the cross section of the pressure monitor line, and has a large rigid capacity for accommodating it. A housing was also required, leading to an increase in cost. In addition, there is a risk of easy leakage due to the pressure applied to the membrane filter surface.
An object of the present invention is to provide a blood circuit pressure monitor protector that solves the above-described problems and that is inexpensive and does not leak.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have replaced the membrane type filter with substantially gas-permeable and liquid-impermeable, 0.5 to 0.5 in the longitudinal direction of the pressure monitor line. The inventors have found that the above-mentioned problems can be solved by employing a porous body having a thickness of 100 mm, and have reached the present invention.
That is, the present invention is a protector for preventing contact between the pressure gauge and the liquid, provided in the pressure monitor line for monitoring the pressure of the blood circuit,
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 in the longitudinal direction of the pressure monitor line.
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. Furthermore, the porous body may be accommodated in a rigid housing having connection portions at both ends.
In addition, it is preferable that the porous body has hydrophobicity.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a blood circuit pressure monitor protector 1 loaded in a tube of a pressure monitor line, that is, a tube 12 for connecting a pressure gauge (not shown) and a drip chamber (not shown). The porous body 11 is gas permeable and liquid impermeable. 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).
[0006]
As the porous body 11, a material made of a hydrophobic material such as polyethylene, polypropylene, or a fluororesin can be used. However, the porous body 11 is not particularly limited, and the porous body such as polyurethane or polystyrene is hydrophobic with fluorine or silicone. Processed ones can also be used.
And the porous body 11 of this example has a diameter of about 0.5 to 100 mm in the longitudinal axis direction of the pressure monitor line while having the same diameter as the inner diameter of the tube 12. If the thickness of the porous body 11 is 0.5 mm or more, there is no fear of easily leaking, and if it is 100 mm or less, the pressure measured by the pressure gauge is not adversely affected. In consideration of ease of manufacture, the thickness is preferably 0.5 to 50 mm.
Moreover, as a pore size of the porous body 11, 0.1-300 micrometers is normally selected and is suitably determined according to thickness. When the thickness of the porous body 11 is 100 mm, the pore size is preferably 300 μm, and when the thickness is 0.5 mm, the pore size is preferably 0.1 μm.
[0007]
By the way, in hemodialysis, the pump pulsates and blood circulates through the blood circuit, and the pressure in the drip chamber fluctuates with a predetermined amplitude according to the pulsation, and the pressure gauge calculates from the pressure fluctuation amplitude. The average value is displayed. On the other hand, the pressure loss is different between the case where the thickness of the porous body 11 is 0.5 mm and the case where the thickness is 100 mm, and the pressure loss is different between the case where the pore size is 0.1 μm and the case where the pore size is 300 μm. It only affects the magnitude of the fluctuation. Therefore, if the thickness and pore size of the porous body 11 are in the above ranges, the numerical values displayed by the pressure gauge are almost the same.
[0008]
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). A connector 13 for connecting to a pressure gauge is provided at one end of the tube 12. The other end of the tube 12 may be connected to the drip chamber via a connector (not shown) or directly connected to the drip chamber.
[0009]
In this example, the substantially gas-permeable and liquid-impermeable porous body 11 itself functions as the blood circuit pressure monitor protector 1. The porous body 11 is usually loaded at a position close to the connector 13 for connecting to the pressure gauge (or the end of the tube 12 when the connector 13 is not required), but the position is not particularly limited.
With this configuration, an area is hardly taken in the cross-sectional direction, and it can be manufactured at a very low cost. In the production, the porous body 11 may be molded and then loaded into the tube 12, or the porous body material may be solidified after being introduced into the tube 12 to form the porous body 11. Good.
[0010]
In addition to the blood circuit pressure monitor protector 1 shown in FIG. 1, the present invention is a blood circuit pressure monitor using a relatively large diameter tube 22 and a relatively small diameter tube 23 as shown in FIG. Protector 2 can also be used. In the blood circuit pressure monitor protector 2, the porous body 21 is loaded into a relatively large diameter tube 22, and then a relatively small diameter tube 23 and a connector 24 are inserted into both ends of the large diameter tube 22. 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.
[0011]
Further, in 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 are porous. Blood circuit pressure monitor protectors 3 and 4 in which the bodies 31 and 41 are accommodated are also included. In addition, a pressure gauge may be directly connected to the pressure gauge connection parts 322 and 422, and a pressure gauge may be connected via a tube.
[0012]
【Example】
As shown in FIG. 5, by operating the pump 51, a circulation system was created in which water stored in the tank 52 was returned to the tank 52 again via the artificial kidney 53 and the drip chamber 54. In addition to the circulation system tube 55, the drip chamber 54 is connected to a pressure monitor line 6 provided with only a pressure gauge 61 without providing a protector, and is provided with a pressure gauge 71 and a conventional membrane type protector 72. The pressure monitor line 7 provided with the pressure monitor line 7, the pressure gauge 81, and the blood circuit pressure monitor protector (porous body protector 82) of the present invention was connected. In addition, as the porous body type 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 axis direction of the pressure monitor line 8 was used. The membrane protector 72 is made of polytetrafluoroethylene and has a thickness of 100 μm and a pore diameter of 0.22 μm.
The pressure is adjusted by the clamp 56, the pressure measured by the pressure gauge 61 of the pressure monitor line 6 is set to 100 mmHg and 200 mmHg, the pressure measured by the pressure gauge 71 of the pressure monitor line 7 and the pressure gauge of the pressure monitor line 8 The pressure measured at 81 was compared (n = 3). The results are shown in Table 1.
[0013]
[Table 1]

[0014]
As can be seen from Table 1, it was confirmed that the pressure measured through the porous body type protector 82 of the present invention was equivalent to the pressure measured through the membrane type protector 72.
[0015]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a blood circuit pressure monitor protector that is inexpensive and has no risk of leakage. When the porous body is loaded into the tube, it is particularly advantageous in terms of cost and easy to manufacture. Further, even when housed in a hard housing, it is not necessary to worry about misalignment or breakage as in the case of a membrane filter, and therefore it can be easily manufactured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a blood circuit pressure monitor protector 1 of the present invention.
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 circulatory system prepared for comparing the pressure obtained through the 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 section 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 (2)

A pressure monitor line for monitoring the pressure of the blood circuit,
A protective body for preventing a pressure gauge and a liquid from coming into contact with each other, and a substantially gas-permeable and liquid-impermeable porous material having a thickness of 0.5 to 100 mm in the longitudinal axis direction of the pressure monitor line A protective body comprising a body is loaded inside a tube of the pressure monitor line connected to a pressure gauge;
A connector for connecting to a pressure gauge is provided at the end of the tube,
A blood circuit pressure monitor line, wherein an outer diameter of a connection portion of the connector with a tube is substantially the same as an outer diameter of the protector .   The blood circuit pressure monitor line according to claim 1, wherein the porous body has hydrophobicity.

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