JP5505043B2 - Blood reservoir - Google Patents

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JP5505043B2
JP5505043B2 JP2010082941A JP2010082941A JP5505043B2 JP 5505043 B2 JP5505043 B2 JP 5505043B2 JP 2010082941 A JP2010082941 A JP 2010082941A JP 2010082941 A JP2010082941 A JP 2010082941A JP 5505043 B2 JP5505043 B2 JP 5505043B2
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blood
conduit
section
drug solution
chemical
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克紀 大熊
稔 田中
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JMS Co Ltd
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Description

本発明は、心肺手術等を行う際に使用される体外血液循環回路において、体外循環中の血液を一時的に貯留する貯血槽に関する。特に、心内血を櫨過するカーデイオトミー部を内蔵した貯血槽に関する。   The present invention relates to a blood reservoir for temporarily storing blood during extracorporeal circulation in an extracorporeal blood circulation circuit used when performing cardiopulmonary surgery or the like. In particular, the present invention relates to a blood reservoir with a built-in cardiotomy section that filters intracardiac blood.

心臓手術等を行う場合、患者の心臓や肺の機能を代替するための血液ポンプや人工肺を備えた体外血液循環回路が用いられる。体外血液循環回路には、患者の静脈から脱血された静脈血を一時的に貯留して循環回路血液量を調整するための貯血槽(「静脈血貯血槽」と呼ばれることがある)や、術野に溢れた血液(心内血)を吸引して回収して一時的に貯留するための貯血槽(「心内血貯血槽」と呼ばれることがある)が設けられる。心内血は、静脈血に比べて、肉片、脂肪、凝血塊などの異物や気泡を多く含むので、心内血貯血槽には、異物を除去するためのフィルタと気泡を消泡するための消泡材とからなるカーデイオトミー部が設けられる。静脈血と心内血とを共通する貯血槽に貯留することも広く行われている。   When performing cardiac surgery or the like, an extracorporeal blood circulation circuit including a blood pump or an artificial lung for substituting the functions of a patient's heart and lungs is used. The extracorporeal blood circulation circuit temporarily stores venous blood removed from the patient's veins to adjust the blood volume of the circulation circuit (sometimes called a `` venous blood reservoir ''), A blood reservoir (sometimes referred to as “intracardiac blood reservoir”) is provided for aspirating, collecting, and temporarily storing blood (intracardiac blood) overflowing the operative field. Since intracardiac blood contains more foreign bodies and bubbles such as meat pieces, fat, and clots than venous blood, the intracardiac blood reservoir contains a filter for removing foreign substances and air bubbles. A cardiotomy section made of antifoaming material is provided. It is also widely performed to store venous blood and intracardiac blood in a common blood reservoir.

図3は、従来のカーデイオトミー部30の一例の概略構成を示した断面図である。このカーデイオトミー部30は、全体として略円筒形状を有するフィルタ31と、フィルタ31の内側に配置され、略円筒形状を有する消泡材32とを備える。フィルタ31の上下の端縁には、略円板形状を有する樹脂板33,34が接着されている。消泡材32は、上側の樹脂板33に接着されて保持されている。上側の樹脂板33の中央には貫通孔35が形成されている。貫通孔35には、心内血をカーディオトミー部30内に導入する導管36が挿入されている(例えば特許文献1参照)
導管36の上流に混合容器37が接続されている。混合容器37内の空間は、隔壁38により、血液が流れる血液流路39と、薬液が流れる薬液流路40とに分割されている。混合容器37の下面に形成された開口41に導管36が接続される。隔壁38は開口41をほぼ2分割している。
FIG. 3 is a cross-sectional view showing a schematic configuration of an example of a conventional cardiotomy section 30. The cardiotomy section 30 includes a filter 31 having a substantially cylindrical shape as a whole and a defoaming material 32 disposed inside the filter 31 and having a substantially cylindrical shape. Resin plates 33 and 34 having a substantially disc shape are bonded to the upper and lower edges of the filter 31. The defoamer 32 is held by being bonded to the upper resin plate 33. A through hole 35 is formed in the center of the upper resin plate 33. A conduit 36 for introducing intracardiac blood into the cardiotomy section 30 is inserted into the through hole 35 (see, for example, Patent Document 1).
A mixing vessel 37 is connected upstream of the conduit 36. The space in the mixing container 37 is divided by a partition wall 38 into a blood channel 39 through which blood flows and a drug solution channel 40 through which a drug solution flows. A conduit 36 is connected to an opening 41 formed on the lower surface of the mixing container 37. The partition wall 38 substantially divides the opening 41 into two.

術野から吸引された血液(心内血)42は、心内血流入ポート43、混合容器37内の血液流路39及び開口41、及び導管36を順に通過してカーデイオトミー部30内に流入する。   The blood (intracardiac blood) 42 sucked from the operative field passes through the intracardiac blood inlet port 43, the blood flow path 39 and the opening 41 in the mixing container 37, and the conduit 36 in this order, and enters the cardiotomy section 30. Flow into.

また、カーデイオトミー部30内の血液に薬液を投与する場合には、薬液44は、薬液注入ポート45に注入され、混合容器37内の薬液流路40及び開口41、及び導管36を順に通過してカーデイオトミー部30内に流入する。   In addition, when a drug solution is administered to the blood in the cardiotomy section 30, the drug solution 44 is injected into the drug solution injection port 45 and sequentially passes through the drug solution flow path 40 and the opening 41 and the conduit 36 in the mixing container 37. Then, it flows into the cardiotomy section 30.

一般に、血液42の流量は薬液44に比べて大きいので、開口41の近傍の血液42の流れによって、導管36がいわゆるアスピレータを構成し、薬液流路40内が負圧となる。薬液流路40内が負圧になると、薬液44の流量などの制御が困難になるなどの問題が生じる。また、薬液44のカーディオトミー部30に対する流入抵抗は小さい方が望まれる。   In general, the flow rate of the blood 42 is larger than that of the drug solution 44. Therefore, the flow of the blood 42 in the vicinity of the opening 41 constitutes a so-called aspirator, and the inside of the drug solution channel 40 has a negative pressure. When the inside of the chemical liquid channel 40 becomes negative pressure, there arises a problem that it becomes difficult to control the flow rate of the chemical liquid 44. Moreover, the one where the inflow resistance with respect to the cardiotomy part 30 of the chemical | medical solution 44 is smaller is desired.

そこで、本発明者らは以前に、上記貯血槽において、血液の流れによって、薬液流路に生じる負圧が抑制され、且つ薬液のカーディオトミ一部に対する流入抵抗が小さくなるような構造を発明し、特許文献2に開示した。即ち、図4に示されるように、導管36において、血液が流れる血液流路と、薬液が流れる薬液流路とが互いに独立して形成された貯血槽である。この貯血槽では、上下方向において、前記血液流路を形成する血液導管部36aの下端は、前記薬液流路を形成する薬液導管部36bの下端よりも下側に位置している。   Therefore, the present inventors previously invented a structure in the blood reservoir in which the negative pressure generated in the chemical liquid flow path is suppressed by the blood flow and the inflow resistance to a part of the cardiotomy of the chemical liquid is reduced. This is disclosed in Patent Document 2. That is, as shown in FIG. 4, in the conduit 36, a blood reservoir in which a blood channel through which blood flows and a drug channel through which a drug solution flows are formed independently of each other. In this blood reservoir, in the vertical direction, the lower end of the blood conduit portion 36a that forms the blood flow path is located below the lower end of the chemical liquid conduit portion 36b that forms the chemical liquid flow path.

特開2002−165878号公報JP 2002-165878 A WO2009/028397A1WO2009 / 028397A1

しかし、上記のように改良した貯血槽においても、投与する薬液(液体)の種類、物性(粘性)や投与速度、投与方法によっては、導管に液溜まりが生じる場合があることが判明した。例えば、シリンジ等で薬液(薬液)をワンショットで注入する場合、注入速度が速いとき、或いは注入する液体の粘性が高いときには、液溜まりが生じ易い。連続で薬液を注入する場合も、液体の粘性が高い、或いは泡立ち易いものであるときには、液溜まりが生じ易い傾向にあった。   However, it has been found that, even in the blood reservoir improved as described above, a liquid pool may be formed in the conduit depending on the kind of liquid medicine (liquid) to be administered, physical properties (viscosity), administration speed, and administration method. For example, when a chemical solution (chemical solution) is injected with a syringe or the like in one shot, when the injection speed is high or the viscosity of the liquid to be injected is high, a liquid pool is likely to occur. In the case of continuously injecting the chemical solution, when the viscosity of the liquid is high or the liquid is liable to be bubbled, the liquid pool tends to be easily generated.

本発明の目的は既述したように、投与する薬液の種類、物性、投与速度、投与方法などを変更しても、導管に液溜まりの生じ難い貯血槽を提供することにある。   As described above, an object of the present invention is to provide a blood reservoir in which liquid does not easily accumulate in a conduit even if the type, physical properties, administration speed, administration method, and the like of a drug solution to be administered are changed.

上記課題を解決するため、本発明は以下のような構成とする。即ち、本発明は、上部に心内血流入ポート及び薬液注入ポートを備え、下端に血液流出ポートを備えたハウジングと、前記ハウジング内に配置されたカーディオトミー部と、前記心内血流入ポート及び前記薬液注入ポートと連通し、前記心内血流入ポートからの血液及び前記薬液注入ポートからの薬液を前記カーデイオトミ一部内に流入させる導管とを有し、前記導管が、前記カーデイオトミ一部内に上方から下方に向かって挿入された貯血槽であって、前記導管内に、前記血液が流れる血液流路と前記薬液が流れる薬液流路とが互いに独立して形成されており、上下方向において、前記血液流路を形成する血液導管部の下端は、前記薬液流路を形成する薬液導管部の下端よりも下側に位置しており、薬液導管部の水平方向の断面は上から下方向に向かうにつれて、徐々に減少し、且つ薬液導管部の下端の開口面は、対応する部位の血液導管部の水平方向での断面よりも大きく形成されていることを特徴とする貯血槽である。前記対応する部位とは、上下方向において、薬液導管部の下端と同じ部位にあるものをいう。   In order to solve the above problems, the present invention is configured as follows. That is, the present invention comprises a housing having an intracardiac blood flow inlet port and a drug solution injection port at the upper portion and a blood outflow port at the lower end, a cardiotomy section disposed in the housing, and the intracardiac blood flow inlet port. And a conduit that communicates with the blood from the intracardiac blood inflow port and the drug solution from the drug solution injection port into the cardiotomy portion, the conduit being in the cardiotomy portion. A blood reservoir inserted downward from above into the conduit, wherein the blood flow path through which the blood flows and the chemical flow path through which the chemical liquid flows are formed independently of each other in the vertical direction. The lower end of the blood conduit part forming the blood channel is located below the lower end of the drug conduit part forming the drug channel, and the horizontal cross section of the drug channel part is from top to bottom. The blood reservoir is characterized in that it gradually decreases as it goes in the direction, and the opening surface at the lower end of the drug solution conduit part is formed larger than the cross section in the horizontal direction of the blood conduit part of the corresponding part. . The said corresponding site | part means what exists in the same site | part as the lower end of a chemical | medical solution conduit | pipe part in an up-down direction.

また、前記薬液導管部下端の開口面と、対応する部位の血液導管部断面の面積比率が1.5〜2.5の範囲である前記の貯血槽である。   Moreover, it is the said blood reservoir whose area ratio of the opening surface of the said chemical | medical solution conduit | pipe part lower end and the blood conduit | pipe part cross section of a corresponding site | part is the range of 1.5-2.5.

或いは、前記薬液導管部下端の開口面積が、120〜150mm2である前記貯血槽である。
さらに、前記薬液導管部下端の開口面における導管内径が、17mm以上である前記のいずれかの貯血槽である。前記導管内径の寸法を規定した導管とは、薬液導管部と血液導管部とを併せた導管のことをいう。以後、単に導管という場合、両者(薬液導管部と血液導管部)を併せたものを指す。
Or it is the said blood reservoir whose opening area of the said chemical | medical solution conduit | pipe part lower end is 120-150 mm2.
Furthermore, in the blood reservoir according to any one of the above, the inner diameter of the conduit at the opening surface at the lower end of the drug solution conduit section is 17 mm or more. The conduit that defines the inner diameter of the conduit refers to a conduit that combines a drug solution conduit portion and a blood conduit portion. Hereinafter, when simply referred to as a conduit, it refers to the combination of both (drug solution conduit portion and blood conduit portion).

本発明の貯血槽では、薬液導管部の下端開口面が、対応する部位の(水平方向における同部位にある)血液導管部の断面に比べ、大きくなるように形成されているので、導管の管径自体をさほど大きくしなくても、薬液導管部下端の開口面(面積)を大きく取ることが可能となる。その結果、薬液導管部の下端開口面を増大することができ、投与する薬液(液体)の種類、物性(粘性)や投与速度、投与方法に影響されることなく、液溜まりの抑止が可能となり、薬液(液体)のスムースな注入が実現できた。   In the blood reservoir of the present invention, the lower end opening surface of the drug solution conduit portion is formed so as to be larger than the cross section of the blood conduit portion (in the same portion in the horizontal direction) of the corresponding portion. Even if the diameter itself is not so large, the opening surface (area) at the lower end of the chemical liquid conduit portion can be increased. As a result, the lower end opening surface of the drug solution conduit can be increased, and the accumulation of liquid can be suppressed without being affected by the type of drug solution (liquid) to be administered, physical properties (viscosity), administration speed, and administration method. Smooth injection of chemicals (liquid) was achieved.

本発明の実施形態に係る貯血槽において、カーディオトミー部に流入する血液及び薬液の流路を示した概略断面図である。In the blood reservoir which concerns on embodiment of this invention, it is the schematic sectional drawing which showed the flow path of the blood and chemical | medical solution which flow into a cardiotomy part. 本発明の実施形態に係る貯血槽において、薬液導管部下端開口面とそれに対応する部位の血液導管部の水平的な断面を示す概略断面図である。In the blood reservoir which concerns on embodiment of this invention, it is a schematic sectional drawing which shows the horizontal cross section of the blood conduit part of the site | part corresponding to a chemical | medical solution conduit | pipe part lower end opening surface. 従来のカーデイオトミー部の一例における概略構成を示した断面図である。It is sectional drawing which showed schematic structure in an example of the conventional cardiotomy part. 従来のカーデイオトミー部の別の例における導管部の概略構成を示した断面図である。It is sectional drawing which showed schematic structure of the conduit | pipe part in another example of the conventional cardiotomy part.

図1は、心内血流入ポート50及び薬液注入ポート72からカーディオトミー部2に至
る血液211及び薬液212の流路を示した概略断面図である。血液と薬液が別々に流れる混合容器200内の空間は、隔壁91により、血液(心内血)が流れる血液流路201と、薬液が流れる薬液流路202とに分割されている。心内血流入ポート50は血液流路201と連通し、薬液流入ポート72は薬液流路202と連通している。容器200の下面に導管90が接続されている。隔壁91は導管90内にも延設されている。この結果、導管90内に、隔壁91を隔てて、血液(心内血)が流れる血液流路93と、薬液が流れる薬液流路95とが互いに独立して形成されている。導管90のうち、血液流路93を形成する部分を血液導管部94と呼び、薬液流路95を形成する部分を薬液導管部96と呼ぶ。血液導管部94及び薬液導管部96はいずれも半円筒形状を有し、これらが一体化された導管90は全体として円筒形状を有する。血液211は、心内血流入ポート50、容器200内の血液流路201、及び導管90内の血液流路95を順に通過してカーディオトミー部2内に流入する。また、薬液212は、薬液注入ポート72、混合容器200内の薬
液流路202、及び導管90内の薬液流路95を順に通過してカーデイオトミー部2内に
流入する。
FIG. 1 is a schematic cross-sectional view showing the flow paths of blood 211 and chemical 212 from the intracardiac blood entry port 50 and the chemical solution injection port 72 to the cardiotomy section 2. A space in the mixing container 200 through which blood and chemical liquid flow separately is divided into a blood flow path 201 through which blood (intracardiac blood) flows and a chemical liquid flow path 202 through which the chemical liquid flows. The intracardiac blood inflow port 50 communicates with the blood flow path 201, and the chemical liquid inflow port 72 communicates with the chemical liquid flow path 202. A conduit 90 is connected to the lower surface of the container 200. The partition wall 91 also extends in the conduit 90. As a result, a blood channel 93 through which blood (intracardiac blood) flows and a drug solution channel 95 through which a drug solution flows are formed independently of each other across the partition wall 91 in the conduit 90. Of the conduit 90, the part that forms the blood flow path 93 is called a blood conduit part 94, and the part that forms the chemical liquid flow path 95 is called a chemical liquid conduit part 96. Both the blood conduit portion 94 and the drug solution conduit portion 96 have a semi-cylindrical shape, and the conduit 90 in which these are integrated has a cylindrical shape as a whole. The blood 211 sequentially passes through the intracardiac blood inlet port 50, the blood flow path 201 in the container 200, and the blood flow path 95 in the conduit 90 and flows into the cardiotomy section 2. Further, the chemical liquid 212 sequentially passes through the chemical liquid injection port 72, the chemical liquid flow path 202 in the mixing container 200, and the chemical liquid flow path 95 in the conduit 90 and flows into the cardiotomy section 2.

本実施の形態では、血液流路201、93と薬液流路202、95とが隔壁91を隔てて完全に分離され独立しているので、血液の流れ及び薬液の流れは互いに相手方に影響を及ぼさない。従って、従来の貯血槽において、アスピレータ効果によって、薬液流路が負圧になるとしち問題は、本実施の形態では発生しない。   In the present embodiment, the blood flow paths 201 and 93 and the chemical liquid flow paths 202 and 95 are completely separated and separated from each other with the partition wall 91 therebetween, so that the blood flow and the chemical liquid flow affect each other. Absent. Therefore, in the conventional blood reservoir, the problem does not occur in this embodiment even if the chemical flow path becomes negative pressure due to the aspirator effect.

また、上下方向において、血液流路93を形成する血液導管部94の下端は、薬液流路95を形成する薬液導管部96の下端よりも下側に位置している。これは、以下の理由による。   Further, in the vertical direction, the lower end of the blood conduit part 94 that forms the blood flow path 93 is located below the lower end of the chemical liquid conduit part 96 that forms the chemical liquid flow path 95. This is due to the following reason.

上述したように、心内血は多くの気泡を含むので、カーディオトミ一部2内において
、気泡が血液面上に浮上する。浮上した気泡の多くは消泡材20に接触して破泡するが、一部は消泡材20で固まれた空間内に盛り上がるように成長することがある。薬液導管部96の下端の開口がこのような気泡で覆われ塞がれると、薬液のカーディオトミー部2に対する流入抵抗が増加する。そこで、本実施の形態では、薬液導管部96の下端の上下方向位置は、なるべく気泡に接することがないように、高い位置に設定されている。
As described above, since the intracardiac blood contains many bubbles, the bubbles rise on the blood surface in the cardiotomy part 2. Most of the air bubbles that have risen come into contact with the defoaming material 20 and break the bubbles, but some of them may grow to rise in the space solidified by the defoaming material 20. When the opening at the lower end of the chemical solution conduit portion 96 is covered and closed with such bubbles, the inflow resistance of the chemical solution to the cardiotomy portion 2 increases. Therefore, in the present embodiment, the vertical position of the lower end of the chemical liquid conduit portion 96 is set to a high position so as not to contact the bubbles as much as possible.

また、薬液導管部96の下端の開口が気泡で塞がれるか否かにかかわらず、薬液導管部96の長さが長くなるほど、薬液のカーデイオトミ一部2に対する流入抵抗が増加する。そこで、本実施の形態では、薬液導管部96の長さは、なるべく短く設定されている。但し、血液導管部の方は、流出する血液と泡を消泡材に近づけ、迅速に破泡、消泡するために、長く設計されている。   In addition, regardless of whether or not the opening at the lower end of the chemical liquid conduit part 96 is blocked by bubbles, the inflow resistance of the chemical liquid to the cardiotomy part 2 increases as the length of the chemical liquid conduit part 96 increases. Therefore, in the present embodiment, the length of the chemical liquid conduit 96 is set as short as possible. However, the blood conduit portion is designed to be longer in order to bring out the blood and bubbles that flow out closer to the defoaming material and to quickly break and defoam.

図示は省略するが、薬液導管部は水平方向の断面が上から下方向に向かうにつれて、徐々に減少するように形成されている。また、薬液導管部下端の断面は、図2に示すように、対応する(水平方向における同一)部位の血液導管部断面よりも大きくなるように、形成されている。それによって、導管の内径が同じ場合でも、薬液導管部の下端開口面97を大きく取ることができる。また、前記下端開口面97と、対応する部位の血液導管部の断面98との面積比は1.5〜2.5の範囲となるように設定することで、血液導管部の機能を損なわずに、薬液導管部の薬液溜まりを改善することが可能となる。   Although illustration is omitted, the chemical liquid conduit portion is formed so as to gradually decrease as the cross section in the horizontal direction goes from top to bottom. Further, as shown in FIG. 2, the cross section of the lower end of the drug solution conduit section is formed to be larger than the cross section of the blood conduit section of the corresponding (the same in the horizontal direction) portion. Thereby, even when the inner diameter of the conduit is the same, the lower end opening surface 97 of the chemical solution conduit portion can be made large. Moreover, the function of the blood conduit portion is not impaired by setting the area ratio between the lower end opening surface 97 and the cross-section 98 of the blood conduit portion of the corresponding portion to be in the range of 1.5 to 2.5. In addition, it is possible to improve the chemical solution reservoir in the chemical solution conduit.

さらに、薬液導管部96の前記下端開口面97の面積は、120〜150mm2に設定するのが、液溜まりの改善に望ましい。同様に、前記下端開口面97を形成する部位における導管内径が、17mm以上となるように設定することも、液溜まり改善に効果がある。上記のように、導管の内径を大きくすることで、液溜まりは抑止できるが、必要以上に大きくしても、無駄であり、デメリットになる。また、導管の大きさが同じ場合には、薬液導管部下端の開口面の大きさが、液溜まりの改善に影響するため、薬液導管部下端の開口面97と、それに対応する部位における血液導管部の水平断面98が、それぞれ半円となるように形成するのではなく、前者(薬液導管部の下端開口面97)の断面積が、後者(血液導管部の対応部位の断面98)の断面積よりも大きくなるように、隔壁を導管の軸からずらして形成するのが好ましい。(図2を参照)
導管90の材料は、特に制限はなく、従来の導管と同じ材料、例えばポリカーボネートを使用することができる。導管の厚みについて、特に制限はないが、1.0mm〜2.0mmのものが一般的に使用される。隔壁91の材料や肉厚についても、特に制限はなく、例えば導管90と同じ材料や寸法を使用することができる。
Furthermore, it is desirable for the improvement of a liquid reservoir to set the area of the said lower end opening surface 97 of the chemical | medical solution conduit | pipe part 96 to 120-150 mm2. Similarly, setting the inner diameter of the conduit at the portion where the lower end opening surface 97 is formed to be 17 mm or more is also effective in improving the liquid pool. As described above, the liquid pool can be suppressed by increasing the inner diameter of the conduit, but even if it is increased more than necessary, it is useless and disadvantageous. In addition, when the size of the conduit is the same, the size of the opening surface at the lower end of the drug solution conduit portion affects the improvement of the liquid reservoir. Therefore, the opening surface 97 at the lower end of the drug solution conduit portion and the blood conduit at the corresponding site. The horizontal cross section 98 of each part is not formed to be a semicircle, but the cross section of the former (the lower end opening surface 97 of the drug solution conduit section) is not the same as the cross section of the latter (the cross section 98 of the corresponding part of the blood conduit section). The partition is preferably formed offset from the axis of the conduit so that it is larger than the area. (See Figure 2)
The material of the conduit 90 is not particularly limited, and the same material as that of the conventional conduit, for example, polycarbonate can be used. Although there is no restriction | limiting in particular about the thickness of a conduit | pipe, The thing of 1.0 mm-2.0 mm is generally used. There is no restriction | limiting in particular also about the material and thickness of the partition 91, For example, the same material and dimension as the conduit | pipe 90 can be used.

以下に示す本発明の実験モデルを使用して、In Vitroの実験を行い、その効果を確認した。図1に示すカーディオトミー2を有する貯血槽において、薬液導管部下端の開口面97に対応する部位の導管90の内径を9mm〜22mmまで変更したものを使用し、複数設けた薬液注入ポート72a、72bから、牛血と各種薬液をそれぞれ注入した。牛血の注入は、臨床における血液濃縮ラインを模擬したものであり、500ml/minの速度で、薬液注入ポート72aから、行った。薬液は、シリンジで生食液、ヘスパンダー、アルブミン溶液、牛血の4種類の液を各20mlずつ、薬液注入ポート72bからワンショットで注入した。心内血流入ポート50からの血液の注入は、今回の実験系に影響しないことが確認できたため、省略した。表1に示すように、導管90の内径によって、各薬液ともに液溜まりが改善されることが判る。   Using the experimental model of the present invention shown below, an in vitro experiment was conducted to confirm the effect. In the blood reservoir having the cardiotomy 2 shown in FIG. 1, a drug solution injection port 72a provided with a plurality of the drug solution injection ports 72a, wherein the inner diameter of the conduit 90 corresponding to the opening surface 97 at the lower end of the drug solution conduit portion is changed from 9 mm to 22 mm, From 72b, cow blood and various chemicals were injected. Bovine blood injection was performed by simulating a clinical blood concentration line, and was performed from the drug solution injection port 72a at a rate of 500 ml / min. As for the chemical solution, 20 ml of each of four kinds of liquids of saline, hessander, albumin solution, and bovine blood were injected with a syringe from the chemical solution injection port 72b in one shot. The injection of blood from the intracardiac blood flow port 50 was omitted because it was confirmed that it did not affect the current experimental system. As shown in Table 1, it can be seen that the liquid pool is improved in each chemical solution by the inner diameter of the conduit 90.

Figure 0005505043
(○:液溜まり無し、×:液溜まり発生)
Figure 0005505043
(○: No liquid pool, ×: Liquid pool generated)

この表から、導管90の内径が20mm以上に設定することが確認できたため、薬液導管の下端開口面積は、内径20mmの導管断面の1/2の面積が必要になると想定し、隔壁91を中心からずらし、薬液導管側が広くなるように設計すると共に、血液導管部の断面を機能を損なわないように調整した結果、導管部の内径は17mm以上、必要であることが確認された。また、その際の隔壁は図2に示されるように、中心軸から2mmほど、血液導管部側にずれた構成となった。   From this table, it was confirmed that the inner diameter of the conduit 90 was set to 20 mm or more. Therefore, it is assumed that the lower end opening area of the chemical solution conduit needs to be 1/2 of the cross section of the conduit having the inner diameter of 20 mm, and the partition wall 91 is the center. As a result of adjusting the cross section of the blood conduit portion so as not to impair the function, it was confirmed that the inner diameter of the conduit portion is 17 mm or more. Further, as shown in FIG. 2, the partition wall at that time was shifted to the blood conduit portion side by about 2 mm from the central axis.

上記で液溜まりが解消されたカーディオトミー、即ち導管部内径が17mmで、且つ隔壁91が中心軸から、2mmほど血液導管部側にずらして形成された導管部を設けたものを使用し、薬液注入ポート72aから、注入する牛血の速度を100ml/min〜500ml/minの範囲で変更させ、液溜まりの効果を調べた結果を表2に示す。薬液注入ポート72bから、注入するワンショットの薬液は、実施例1と同様に、生食液、ヘスパンダー、アルブミン、牛血の4種類で、それぞれ20mlずつ、注入した。また、薬液注入ポート72bからの各種薬液の注入方法を、ワンショット、落差、ポンプによる送液の3種類に変更し、液溜まりの効果に影響が無いかを確認した。この場合、薬液注入ポート72aから、注入する牛血の速度は100ml/minに固定した。   The cardiotomy in which the liquid pool is eliminated as described above, that is, a drug solution having a conduit portion inner diameter of 17 mm and a partition wall 91 provided with a conduit portion formed by shifting about 2 mm from the central axis toward the blood conduit portion side, is used. Table 2 shows the results of examining the effect of the liquid pool by changing the rate of bovine blood to be injected from the injection port 72a in the range of 100 ml / min to 500 ml / min. As in Example 1, the one-shot chemical solution to be injected was injected from the chemical solution injection port 72b into four types of saline, hessander, albumin, and bovine blood, 20 ml each. In addition, the method of injecting various chemical solutions from the chemical solution injection port 72b was changed to three types of one-shot, drop, and liquid feeding by a pump, and it was confirmed whether the effect of the liquid pool was affected. In this case, the rate of bovine blood to be injected from the chemical solution injection port 72a was fixed at 100 ml / min.

Figure 0005505043
〔但し、表中の注入速度(薬液)は、薬液注入ポート72aからの注入速度を表す。〕
Figure 0005505043
[However, the injection rate (chemical solution) in the table represents the injection rate from the chemical solution injection port 72a. ]

本発明は、人工心肺分野に使用される貯血槽において、有用な技術である。   The present invention is a useful technique in a blood reservoir used in the field of cardiopulmonary bypass.

2. カーディオトミー
10. フィルタ
20. 消泡材
30. カーディオトミー部
31. フィルタ
32. 消泡材
33. (上部)樹脂盤
34. (下部)樹脂盤
35. 貫通孔
36. 導管
36a. 血液導管部
36b. 薬液導管部
37. 混合容器
38. 混合容器
39. 血液流路
40. 薬液流路
41. 開口
42. 血液(心内血)
43. 心内血流入ポート
44. 薬液
45. 薬液注入ポート
50. 心内血流入ポート
60. 樹脂盤
61. 貫通孔
72. 薬液流入ポート
72a. 薬液流入ポート1
72b. 薬液流入ポート2
90. 導管
91. 隔壁
92.
93. 血液流路
94. 血液導管部
95. 薬液流路
96. 薬液導管部
97. (薬液導管部の)下端開口面97
98. 血液導管部の(薬液導管部下端の開口面)に対応する部位の水平断面
200.容器
201. 血液流路
202. 薬液流路
211. 血液
212. 薬液
2. Cardiotomy 10. Filter 20. Antifoaming material 30. Cardiotomy section 31. Filter 32. Antifoaming material 33. (Upper part) Resin board 34. (Lower) Resin board 35. Through hole 36. Conduit 36a. Blood conduit portion 36b. Chemical solution conduit part 37. Mixing container 38. Mixing container 39. Blood channel 40. Chemical liquid channel 41. Opening 42. Blood (intracardiac blood)
43. Intracardiac blood flow port 44. Chemical solution 45. Chemical solution injection port 50. Intracardiac blood flow port 60. Resin board 61. Through hole 72. Chemical solution inflow port 72a. Chemical inflow port 1
72b. Chemical solution inflow port 2
90. Conduit 91. Septum 92.
93. Blood channel 94. Blood conduit part 95. Chemical liquid channel 96. Chemical liquid conduit part 97. Lower end opening surface 97 (of the chemical solution conduit)
98. Horizontal cross section 200 of the site corresponding to the blood conduit portion (opening surface at the lower end of the drug solution conduit portion). Container 201. Blood channel 202. Chemical liquid channel 211. Blood 212. Medicinal solution

Claims (4)

上部に心内血流入ポート及び薬液注入ポートを備え、下端に血液流出ポートを備えたハウジングと、前記ハウジング内に配置されたカーディオトミー部と、前記心内血流入ポート及び前記薬液注入ポートと連通し、前記心内血流入ポートからの血液及び前記薬液注入ポートからの薬液を前記カーデイオトミー部内に流入させる導管とを有し、前記導管が、前記カーデイオトミー部内に上方から下方に向かって挿入された貯血槽であって、前記導管内に、前記血液が流れる血液流路と前記薬液が流れる薬液流路とが互いに独立して形成されており、上下方向において、前記血液流路を形成する血液導管部の下端は、前記薬液流路を形成する薬液導管部の下端よりも下側に位置しており、薬液導管部の水平方向の断面は上から下方向に向かうにつれて、徐々に減少し、且つ薬液導管部の下端の開口面は、対応する部位の血液導管部の水平方向での断面よりも大きく形成されていることを特徴とする貯血槽である。   A housing having an intracardiac blood inflow port and a drug solution injecting port at an upper portion, a blood outlet port at a lower end, a cardiotomy section disposed in the housing, the intracardiac blood inflow port and the medicinal solution injecting port And a conduit for allowing blood from the intracardiac blood inflow port and chemical from the medicinal solution injection port to flow into the cardiotomy section, and the conduit extends downward into the cardiotomy section from above The blood reservoir is inserted into the conduit, and a blood flow path through which the blood flows and a chemical liquid flow path through which the chemical liquid flows are formed independently of each other in the conduit. The lower end of the blood conduit part forming the channel is located below the lower end of the drug solution conduit part forming the drug channel, and the horizontal cross section of the drug solution part is from top to bottom. Te gradually decreases, and the opening surface of the lower end of the liquid medicine conduit tube portion is a blood reservoir, characterized in that it is larger than the cross section in the horizontal direction of the blood conduit tube portion of the corresponding site. 前記薬液導管部下端の開口面と、対応する部位の血液導管部断面の面積比率が1.5〜2.5の範囲にある請求項1記載の貯血槽。   2. The blood reservoir according to claim 1, wherein an area ratio of an opening surface at the lower end of the drug solution conduit portion and a cross section of the blood conduit portion at a corresponding site is in a range of 1.5 to 2.5. 前記薬液導管部下端の開口面積が、120〜150mm2である請求項1記載の貯血槽。   The blood reservoir according to claim 1, wherein an opening area of a lower end of the drug solution conduit part is 120 to 150 mm2. 前記薬液導管部下端の開口面における導管内径が、17mm以上である請求項1〜3のいずれかの項に記載の貯血槽。   The blood reservoir according to any one of claims 1 to 3, wherein a conduit inner diameter at an opening surface at a lower end of the drug solution conduit portion is 17 mm or more.
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