JP2004357985A

JP2004357985A - Chemical injection apparatus

Info

Publication number: JP2004357985A
Application number: JP2003160758A
Authority: JP
Inventors: Hideji Obayashi; 秀司大林
Original assignee: Nemoto Kyorindo Co Ltd
Current assignee: Nemoto Kyorindo Co Ltd
Priority date: 2003-06-05
Filing date: 2003-06-05
Publication date: 2004-12-24
Anticipated expiration: 2023-06-05
Also published as: JP4338446B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical injection apparatus by which a chemical is injected into a patient without requiring the switching operation of a switch valve etc. and the blood pressure of the patient can be detected. <P>SOLUTION: When the chemical is injected into the patient through a chemical injection tube 107, a tube cut-off mechanism 122 prevents the high-pressure chemical from flowing into a blood pressure detection tube 108. Thus, the high pressure of the chemical is prevented from acting on a blood pressure detection mechanism 104 without requiring the switching operation etc. of the switch valve. Even if the high-pressure chemical breaks through the tube cut-off mechanism 122, the chemical of that pressure breaks through an injection operation mechanism 124 and flows back to a pressure container 102 of physiological salt solution from a physiological salt solution injection tube 109. Thus, the high pressure of the chemical never acts on the detection mechanism 104, and the detection mechanism 104 which has a structure of low pressure resistance is prevented from being broken. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、被験者の血管に薬液を注入する薬液注入装置に関し、特に、薬液を注入する血管の血圧をリアルタイムに検出する薬液注入装置に関する。
【０００２】
【従来の技術】
現在、被験者の透視画像を撮像する透視撮像装置としては、ＣＴ（ＣｏｍｐｕｔｅｄＴｏｍｏｇｒａｐｈｙ）スキャナ、ＭＲＩ（ＭａｇｎｅｔｉｃＲｅｓｏｎａｎｃｅＩｍａｇｉｎｇ）装置、ＰＥＴ（ＰｏｓｉｔｒｏｎＥｍｉｓｓｉｏｎＴｏｍｏｇｒａｐｈｙ）装置、超音波診断装置、アンギオ装置、ＭＲＡ（ＭＲＡｎｇｉｏ）装置、等がある。
【０００３】
上述のような装置を使用するとき、被験者に造影剤や生理食塩水などの薬液を注入することがあり、この注入を自動的に実行する薬液注入装置も実用化されている。この薬液注入装置は注入ヘッドを有しており、この注入ヘッドに薬液シリンジが着脱自在に装着される。薬液シリンジは、薬液が充填されるシリンダ部材を有しており、このシリンダ部材にピストン部材がスライド自在に挿入されている。
【０００４】
薬液シリンジには、最初から薬液が充填されている製品もあるが、作業者が所望の薬液を補充する製品もある。このような薬液シリンジを薬液注入装置で使用する場合、例えば、薬液として造影剤が充填されている造影タンクに薬液シリンジを造影吸入チューブで連結し、その薬液シリンジを注入ヘッドに装着する。注入ヘッドは薬液シリンジのシリンダ部材とピストン部材とを別個に保持し、そのピストン部材をシリンダ部材に対してスライダ機構により後退させる。
【０００５】
これで造影タンクから薬液シリンジに薬液が補充されると、薬液シリンジから造影タンクと造影吸入チューブとを取り外し、その薬液シリンジを被験者に造影注入チューブで連結する。この状態で注入ヘッドがスライダ機構によりピストン部材をシリンダ部材に対して前進させると、薬液シリンジから被験者に薬液が注入される。
【０００６】
しかし、従来の薬液注入装置では、上述のように薬液シリンジに造影タンクから薬液を吸入するときは、作業者が薬液シリンジに造影吸入チューブで造影タンクを連結する必要があり、薬液シリンジから被験者に薬液を注入するときは、作業者が薬液シリンジから造影吸入チューブを取り外して造影注入チューブを連結する必要がある。このため、作業者が煩雑な作業を実行する必要があり、作業者により造影吸入チューブや造影注入チューブが汚染される懸念がある。
【０００７】
上述の課題を解決するため、例えば、造影タンクに連結した造影吸入チューブと、被験者に連結した造影注入チューブと、を切換弁で薬液シリンジに連結した薬液注入装置もある。このような薬液注入装置では、切換弁の手動操作により造影注入チューブを遮断して造影吸入チューブを開放した状態で、造影タンクから薬液シリンジに薬液を吸入する。
【０００８】
そして、切換弁の手動操作により造影吸入チューブを遮断して造影注入チューブを開放した状態で、薬液シリンジから被験者に薬液を注入する。このような薬液注入装置では、小容量の薬液シリンジに大容量の造影タンクから薬液を補給できるので、造影注入チューブを交換するだけで複数の被験者に薬液を注入することが可能である。
【０００９】
さらに、上述の造影注入チューブなどにＹコネクタと血圧検出チューブなどで血圧検出機構であるトランスデューサを連結し、上述のように造影剤を注入する血管の血圧をトランスデューサでリアルタイムに検出できるようにした薬液注入装置もある。
【００１０】
ただし、トランスデューサは構造的に耐圧が低いので、注入される造影剤の高圧が作用すると破壊が発生する。このため、トランスデューサを血圧検出チューブで造影注入チューブに連結した薬液注入装置では、血圧検出チューブと造影注入チューブとを切換弁で連結している。
【００１１】
このような薬液注入装置では、造影剤を注入するときは血圧検出チューブを造影注入チューブから遮断しておき、血圧を検出するときのみ血圧検出チューブを造影注入チューブに連結することにより、造影剤を高圧に注入できるようにしながらもトランスデューサの破壊を防止している。
【００１２】
なお、上述のような薬液注入装置は、例えば、本出願人などにより提案されて出願されている（例えば、特許文献１〜５参照）。
【００１３】
【特許文献１】
特開平１１−３４２２０９号
【特許文献２】
特開平１１−０９４１０３号
【特許文献３】
特開平０７−１００２１２号
【特許文献４】
特開平０６−０３０９０５号
【特許文献５】
特開２００１−１０４４９２号
【００１４】
【発明が解決しようとする課題】
上述のトランスデューサを追加した薬液注入装置では、造影剤を被験者に高圧で注入することができ、被験者の血圧もトランスデューサで検出することができる。しかし、造影剤の高圧からトランスデューサを保護するため、前述のように造影剤を注入するときと血圧を検出するときで切換弁を操作する必要があり、その作業が煩雑である。
【００１５】
特に、前述の薬液注入装置では、造影タンクから薬液シリンジに造影剤を吸入するときと、薬液シリンジから被験者に造影剤を注入するときも、切換弁を操作する必要がある。つまり、各種の状態ごとに複数の切換弁を操作する必要があるので、その作業が極めて煩雑で誤操作が発生する可能性が高い。
【００１６】
本発明は上述のような課題に鑑みてなされたものであり、切換弁の切換操作を必要とすることなく被験者に薬液を高圧に注入できるとともに血圧検出機構の破壊も防止できる薬液注入装置を提供することを目的とする。
【００１７】
【課題を解決するための手段】
本発明の第１の薬液注入装置は、液体として血液が流動している人体の血管に液体として少なくとも薬液を注入する薬液注入装置であって、薬液ポンプ機構、血圧検出機構、生食加圧容器、吸入規制機構、薬液注入チューブ、注入規制機構、血圧検出チューブ、チューブ遮断機構、生食注入チューブ、注入操作機構、を有している。
【００１８】
薬液ポンプ機構は、薬液を血管に注入し、生食加圧容器は、生理食塩水が通常の血圧より高圧の所定圧力に加圧されて事前に収容されており、血圧検出機構は、血管を流動する血液の圧力を検出する。薬液注入チューブは、末端が薬液ポンプ機構に連結されていて先端が血管に連結され、注入規制機構は、薬液注入チューブに挿入されていて薬液の移動を薬液ポンプ機構から血管への方向に規制する。血圧検出チューブは、末端が血圧検出機構に連結されていて先端が薬液注入チューブの注入規制機構より先端側の位置に連結されており、チューブ遮断機構は、血圧検出チューブに挿入されていて通常の血圧より高圧で生食加圧容器の加圧より低圧の所定圧力が作用すると液体の移動を遮断する。生食注入チューブは、末端が生食加圧容器に連結されていて先端が血圧検出チューブのチューブ遮断機構より末端側の位置に連結されており、注入操作機構は、生食注入チューブを手動操作により開閉自在に閉止しているが、生食加圧容器の加圧より高圧で血圧検出機構の耐圧より低圧の所定圧力が作用すると液体の移動を許容する。
【００１９】
従って、本発明の薬液注入装置では、薬液注入チューブによる薬液の移動が注入規制機構により薬液ポンプ機構から血管への方向に規制されているので、切換弁の切換操作などを必要とすることなく薬液は薬液ポンプ機構により被験者の血管に注入される。このとき、注入される薬液の圧力は生食加圧容器の加圧より高圧となり、その圧力ではチューブ遮断機構が血圧検出チューブを遮断するので、高圧の薬液が血圧検出チューブに流入しない。
【００２０】
また、生理食塩水は生食加圧容器により加圧されており、その圧力では生食注入チューブは注入操作機構により閉止されているので、生理食塩水は通常は生食注入チューブから血圧検出チューブなどに流出しない。注入操作機構が手動操作により開放されると、生食加圧容器により加圧されている生理食塩水が生食注入チューブから血圧検出チューブに流出する。
【００２１】
ただし、その圧力では血圧検出チューブは先端近傍がチューブ遮断機構により遮断されているので、生理食塩水は薬液注入チューブに流出することなく生食注入チューブと血圧検出チューブとを充填する。このように血圧検出チューブが生理食塩水で充填されるとともに薬液注入チューブが薬液で充填されると、前述のように薬液が注入されるときは、その高圧はチューブ遮断機構により遮断されて血圧検出機構に作用せず、薬液が注入されないときは、血管を流動する血液の圧力はチューブ遮断機構に遮断されることなく血圧検出機構に検出される。
【００２２】
このため、切換弁の切換操作などを必要とすることなく、薬液注入チューブによる薬液の高圧の注入と血圧検出機構による血圧の検出とが実行される。さらに、もしも高圧な薬液がチューブ遮断機構を突破した場合でも、その圧力の薬液は注入操作機構を突破して生食注入チューブから生食加圧容器に逆流するので、薬液の高圧が血圧検出機構に作用しない。
【００２３】
本発明の第２の薬液注入装置は、薬液収容容器、薬液吸入チューブ、吸入規制機構、も有している。薬液収容容器は、大容量の薬液が事前に収容されており、薬液ポンプ機構は、小容量の薬液を薬液収容容器から吸入して血管に注入する。薬液吸入チューブは、末端が薬液収容容器に連結されていて先端が薬液ポンプ機構に連結されており、吸入規制機構は、薬液吸入チューブに挿入されていて薬液の移動を薬液収容容器から薬液ポンプ機構への方向に規制する。
【００２４】
従って、本発明の薬液注入装置では、薬液吸入チューブによる薬液の移動が吸入規制機構により薬液収容容器から薬液ポンプ機構への方向に規制されており、薬液注入チューブによる薬液の移動が注入規制機構により薬液ポンプ機構から血管への方向に規制されているので、切換弁の切換操作などを必要とすることなく薬液は薬液ポンプ機構により薬液収容容器から吸入されて被験者の血管に注入される。
【００２５】
なお、本発明で云う各種の構成要素は、個々に独立した存在である必要はなく、複数の構成要素が１個の部材として形成されていること、ある構成要素が他の構成要素の一部であること、ある構成要素の一部と他の構成要素の一部とが重複していること、等も可能である。
【００２６】
【発明の実施の形態】
［実施の形態の構成］
本発明の薬液注入装置の実施の形態を図面を参照して以下に説明する。本形態の薬液注入装置１００は、薬液収容容器である造影タンク１０１、生食加圧容器である生食バック１０２、薬液ポンプ機構である薬液シリンジ１０３、血圧検出機構であるトランスデューサ１０４、薬液吸入チューブである造影吸入チューブ１０６、薬液注入チューブである造影注入チューブ１０７、血圧検出チューブ１０８、生食注入チューブ１０９、等を主要部分として有している。
【００２７】
造影タンク１０１は、液体である薬液として大容量の造影剤が事前に収容されており、生食バック１０２は、液体である生理食塩水が通常の血圧である“９０〜１４０（ｍｍＨｇ）”より高圧の“３００（ｍｍＨｇ）”に加圧されて事前に収容されている。薬液シリンジ１０３は、小容量のシリンダ部材１１１にピストン部材１１２がスライド自在に挿入されており、トランスデューサ１０４は、被験者の血管（図示せず）を流動する血液の圧力を検出する。
【００２８】
造影吸入チューブ１０６は、末端が造影タンク１０１に連結されており、先端が薬液シリンジ１０３に連結されている。ただし、造影吸入チューブ１０６には吸入規制機構である一方弁１１４が挿入されており、この一方弁１１４により造影剤の移動が造影タンク１０１から薬液シリンジ１０３への方向に規制される。
【００２９】
造影注入チューブ１０７は、末端が薬液シリンジ１０３に連結されており、先端が血管に連結されるカテーテル１１５からなる。ただし、造影注入チューブ１０７にも注入規制機構である一方弁１１６が末端近傍に挿入されており、この一方弁１１６により造影剤の移動が薬液シリンジ１０３から血管への方向に規制される。
【００３０】
このため、薬液シリンジ１０３のシリンダ部材１１１からピストン部材１１２が引き出されると、造影タンク１０１から薬液シリンジ１０３に造影剤が負圧で吸入され、シリンダ部材１１１にピストン部材１１２が押し込まれると、薬液シリンジ１０３から血管に造影剤が正圧で注入される。
【００３１】
血圧検出チューブ１０８は、先端が造影注入チューブ１０７の一方弁１１６より先端側に連結されており、末端がトランスデューサ１０４に連結されている。また、血圧検出チューブ１０８は、末端近傍に３方活栓１１９で脱気シリンジ１２１が連結されており、先端近傍にチューブ遮断機構であるスイッチングバルブ１２２が挿入されている。
【００３２】
３方活栓１１９は、血圧検出チューブ１０８を連通させた状態と、血圧検出チューブ１０８の末端側を閉止して先端側に脱気シリンジ１２１を連通させた状態と、を切り換える。脱気シリンジ１２１は、例えば、血圧検出チューブ１０８に充填された生理食塩水を吸入することにより、血圧検出チューブ１０８に混入した気泡を排除する。
【００３３】
スイッチングバルブ１２２は、所定圧力が作用すると液体の移動を遮断し、その所定圧力より低圧の液体は移動を許容する。その所定圧力は、通常の血圧より高圧で生食バック１０２の加圧より低圧に設定されており、例えば、“２５０（ｍｍＨｇ）”などとされている。
【００３４】
生食注入チューブ１０９は、末端が生食バック１０２に連結されており、先端が血圧検出チューブ１０８のスイッチングバルブ１２２より末端側にＹコネクタ１２３で連結されている。この生食注入チューブ１０９には、注入操作機構であるフラッシングデバイス１２４が挿入されており、このフラッシングデバイス１２４は、生食注入チューブ１０９を手動操作により開閉自在に閉止しているが、生食バック１０２の加圧より高圧の所定圧力が作用すると液体の移動を許容する。
【００３５】
［実施の形態の動作］
上述のような構成において、本形態の薬液注入装置１００は、例えば、アンギオ装置やＭＲＡ装置などの透視撮像装置で撮像される被験者の血管に造影剤を注入し、同時に造影剤が注入される血管の血圧をリアルタイムに検出することに利用される。
【００３６】
なお、以下に薬液注入装置１００の使用手順を具体的に説明するが、その手順は一例であって実際の現場では様々な手順が可能である。まず、作業者は造影注入チューブ１０７のカテーテル１１５を被験者に連結していない状態で、造影注入チューブ１０６に造影タンク１０１を連結するとともに生食注入チューブ１０９に生食バック１０２を連結する。
【００３７】
このような状態で薬液シリンジ１０３のピストン部材１１２を後退させると、その負圧により造影タンク１０１から造影注入チューブ１０６により薬液シリンジ１０３のシリンダ部材１１１まで造影剤が吸入される。つぎに、薬液シリンジ１０３のピストン部材１１２を前進させると、薬液シリンジ１０３のシリンダ部材１１１から造影注入チューブ１０７に造影剤が充填される。
【００３８】
また、生食バック１０２では生理食塩水が加圧されているので、フラッシングデバイス１２４を手動操作で開放すると同時に脱気シリンジ１２１を手動操作で吸引させると、生食バック１０２から生食注入チューブ１０９と血圧検出チューブ１０８とに生理食塩水が充填される。
【００３９】
これで薬液注入装置１００の全チューブ１０６〜１０９の内部から空気が排除された状態となるので、その造影注入チューブ１０７のカテーテル１１５を被験者の血管に連結する。このような状態で薬液シリンジ１０３のピストン部材１１２を後退させると造影タンク１０１から造影注入チューブ１０６によりシリンダ部材１１１まで造影剤が吸入され、ピストン部材１１２を前進させるとシリンダ部材１１１から造影注入チューブ１０７により被験者の血管に造影剤が注入される。
【００４０】
また、カテーテル１１５からトランスデューサ１０４までの経路も造影剤と生理食塩水とで充填されているので、造影剤を注入していないときには血管を流動する血液の圧力がトランスデューサ１０４まで伝達され、このトランスデューサ１０４により血圧が直接的に検出される。
【００４１】
［実施の形態の効果］
本形態の薬液注入装置１００では、上述のように被験者の血管に造影剤を注入することができ、被験者の血圧を検出することもできる。ただし、血圧を検出するトランスデューサ１０４の耐圧は低いのに、薬液シリンジ１０３により造影剤は高圧に注入される。
【００４２】
しかし、本形態の薬液注入装置１００では、血圧検出チューブ１０８に挿入されているスイッチングバルブ１２２と生食注入チューブ１０９に挿入されているフラッシングデバイス１２４により、造影剤の高圧がトランスデューサ１０４に作用することが防止されている。
【００４３】
より具体的には、上述のように薬液シリンジ１０３から造影注入チューブ１０７により被験者の血管に造影剤が注入されているとき、その造影剤の高圧がスイッチングバルブ１２２に作用する。しかし、このスイッチングバルブ１２２は、前述のように通常の血圧より高圧で生食バック１０２の加圧より低圧の所定圧力が作用すると液体の流動を遮断するので、造影剤の高圧がトランスデューサ１０４に作用して破壊されることがない。
【００４４】
それでいて、造影剤が注入されないときは、スイッチングバルブ１２２は血圧の伝導を許容するので、トランスデューサ１０４により血圧を検出することができる。このため、本形態の薬液注入装置１００では、切換弁の切換操作を必要とすることなく、造影剤の高圧注入とトランスデューサ１０４の破壊防止とを両立することができる。
【００４５】
しかも、もしも高圧の造影剤がスイッチングバルブ１２２を突破しても、フラッシングデバイス１２４は、生食バック１０２の加圧より高圧でトランスデューサ１０４の耐圧より低圧の所定圧力が作用すると液体の移動を許容する。このため、スイッチングバルブ１２２を突破した造影剤の高圧は生食注入チューブ１０９によりフラッシングデバイス１２４から生食バック１０２に流出することになり、トランスデューサ１０４の破壊を確実に防止することができる。
【００４６】
しかも、フラッシングデバイス１２４は、生食バック１０２から血圧検出チューブ１０８に生理食塩水を充填する作業を操作するために利用され、スイッチングバルブ１２２は、血圧検出チューブ１０８に充填される生理食塩水が造影注入チューブ１０７に流出することを防止するためにも利用されるので、全体に簡単な構造で無駄なくトランスデューサ１０４の破壊を防止することができる。
【００４７】
［実施の形態の変形例］
本発明は上記形態に限定されるものではなく、その要旨を逸脱しない範囲で各種の変形を許容する。例えば、上記形態では造影吸入チューブ１０６と造影注入チューブ１０７とに一方弁１１４，１１６が１個ずつ挿入されていることを例示したが、このような一方弁１１４，１１６を二重三重に挿入することも可能であり、図２に示すように、造影吸入チューブ１０６や造影注入チューブ１０７を電動で遮断する電動遮断機構２０１を追加することも可能である。
【００４８】
また、上記形態では薬液シリンジ１０３から注入する造影剤で造影注入チューブ１０７を脱気することを例示したが、造影注入チューブ１０７に３方活栓２０３で脱気シリンジ２０４を連結し、この脱気シリンジ２０４も造影注入チューブ１０７の脱気に利用することも可能である。
【００４９】
さらに、上記形態では造影注入チューブ１０７と血圧検出チューブ１０８とが直接に連結されていることを例示したが、これらを３方活栓２０６で連結することも可能である。また、上記形態では説明を簡単とするために造影注入チューブ１０７の先端部分が単純にカテーテル１１５からなることを例示したが、実際の薬液注入装置では、カテーテル１１５の末端部分にガイドワイヤの挿入機構などが追加されていることが可能である（図示せず）。
【００５０】
さらに、上記形態では薬液注入装置１００を１個の装置として説明したが、当然ながら造影タンク１０１や生食バック１０２などは現場で装着および交換される。このため、本形態の薬液注入装置１００を実際に製品とするときは、造影タンク１０１、生食バック１０２、薬液シリンジ１０３、トランスデューサ１０４、カテーテル１１５、等を取り外し、造影吸入チューブ１０６、造影注入チューブ１０７、血圧検出チューブ１０８、生食注入チューブ１０９、等からなるチューブユニット（図示せず）とすることが好適である。
【００５１】
また、上記形態では薬液注入装置１００が造影タンク１０１と造影吸入チューブ１０６も有しており、薬液シリンジ１０３で造影タンク１０１から吸入した造影剤を造影注入チューブ１０７で被験者に注入することを例示したが、造影タンク１０１と造影吸入チューブ１０６とを有しておらず、薬液シリンジ１０３が事前に収容されている造影剤のみを造影注入チューブ１０７で被験者に注入する薬液注入装置（図示せず）なども実施可能である。
【００５２】
なお、このような薬液注入装置に対応したチューブユニットは、当然ながら造影吸入チューブ１０６を有することなく、造影注入チューブ１０７、血圧検出チューブ１０８、生食注入チューブ１０９、等からなることが好適である（図示せず）。
【００５３】
さらに、上記形態ではアンギオ装置やＭＲＡ装置などの透視撮像装置で撮像される被験者に薬液注入装置１００で薬液を注入することを例示したが、このような透視撮像装置としては、ＣＴスキャナ、ＭＲＩ装置、ＰＥＴ装置、超音波診断装置、等も可能である。
【００５４】
【発明の効果】
本発明の薬液注入装置では、薬液が薬液注入チューブにより被験者に注入されるときは、チューブ遮断機構により高圧の薬液が血圧検出チューブに流入しないので、切換弁の切換操作を必要とすることなく薬液の高圧が血圧検出機構に作用することを防止でき、もしも、高圧な薬液がチューブ遮断機構を突破した場合でも、その圧力の薬液は注入操作機構を突破して生食注入チューブから生食加圧容器に逆流するので、薬液の高圧が血圧検出機構に作用せず、構造的に耐圧が低い血圧検出機構の破壊を防止することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態の薬液注入装置の全体構造を示す模式図である。
【図２】薬液注入装置の一変形例の全体構造を示す模式図である。
【符号の説明】
１００薬液注入装置
１０１薬液収容容器である造影タンク
１０２生食加圧容器である生食バック
１０３薬液ポンプ機構である薬液シリンジ
１０４血圧検出機構であるトランスデューサ
１０６薬液吸入チューブである造影吸入チューブ
１０７薬液注入チューブである造影注入チューブ
１０８血圧検出チューブ
１０９生食注入チューブ
１１１シリンダ部材
１１２ピストン部材
１１４吸入規制機構である一方弁
１１６注入規制機構である一方弁
１２２チューブ遮断機構であるスイッチングバルブ
１２４注入操作機構であるフラッシングデバイス[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drug solution injector for injecting a drug solution into a blood vessel of a subject, and more particularly to a drug solution injector for detecting the blood pressure of a blood vessel into which a drug solution is injected in real time.
[0002]
[Prior art]
At present, as a fluoroscopic imaging device that captures a fluoroscopic image of a subject, a CT (Computed Tomography) scanner, an MRI (Magnetic Resonance Imaging) device, a PET (Postrontron Emission Tomography) device, an ultrasonic diagnostic device, an MR angiography device, and an MR angiography device are provided. ) Devices.
[0003]
When the above-described apparatus is used, a liquid medicine such as a contrast medium or a physiological saline may be injected into a subject, and a liquid medicine injection apparatus that automatically executes the injection has been put to practical use. This liquid injector has an injection head, and a liquid syringe is detachably mounted on the injection head. The chemical syringe has a cylinder member filled with a chemical solution, and a piston member is slidably inserted into the cylinder member.
[0004]
Some drug syringes are filled with a drug solution from the beginning, while others have a worker refilling a desired drug solution. When such a liquid syringe is used in a liquid injector, for example, the liquid syringe is connected to a contrast tank filled with a contrast agent as a liquid by a contrast suction tube, and the liquid syringe is attached to an injection head. The injection head separately holds a cylinder member and a piston member of the liquid syringe, and retracts the piston member with respect to the cylinder member by a slider mechanism.
[0005]
When the liquid medicine is replenished from the contrast tank to the liquid syringe, the contrast tank and the contrast suction tube are removed from the liquid syringe, and the liquid syringe is connected to the subject by a contrast injection tube. In this state, when the injection head advances the piston member with respect to the cylinder member by the slider mechanism, the liquid medicine is injected into the subject from the liquid syringe.
[0006]
However, in the conventional liquid injector, as described above, when inhaling the liquid from the contrast tank into the liquid syringe, the operator needs to connect the contrast tank to the liquid syringe with a contrast suction tube, and the liquid syringe is used to inject the patient into the subject. When injecting a drug solution, an operator needs to remove the contrast suction tube from the drug solution syringe and connect the contrast injection tube. Therefore, it is necessary for the operator to perform complicated work, and there is a concern that the operator may contaminate the contrast inhalation tube and the contrast infusion tube.
[0007]
In order to solve the above-mentioned problem, for example, there is also a drug solution injection device in which a contrast suction tube connected to a contrast tank and a contrast injection tube connected to a subject are connected to a drug syringe by a switching valve. In such a liquid injector, the liquid is sucked from the contrast tank into the liquid syringe while the contrast injection tube is opened by opening the contrast injection tube by manually operating the switching valve.
[0008]
Then, the liquid medicine is injected into the subject from the liquid medicine syringe in a state in which the contrast suction tube is shut off and the contrast injection tube is opened by manual operation of the switching valve. In such a liquid injector, the liquid syringe can be supplied from a large-capacity contrast tank to a small-capacity liquid syringe, so that it is possible to inject the liquid into a plurality of subjects simply by replacing the contrast injection tube.
[0009]
Further, a Y-connector and a transducer as a blood pressure detection mechanism are connected to the above-described contrast injection tube or the like by a blood pressure detection tube or the like, so that the blood pressure of a blood vessel into which a contrast agent is injected can be detected in real time by the transducer as described above. There is also an injection device.
[0010]
However, since the transducer is structurally low in pressure resistance, destruction occurs when high pressure of the injected contrast medium acts. For this reason, in a drug solution injector in which a transducer is connected to a contrast injection tube by a blood pressure detection tube, the blood pressure detection tube and the contrast injection tube are connected by a switching valve.
[0011]
In such a liquid injector, the blood pressure detection tube is disconnected from the contrast injection tube when the contrast agent is injected, and the blood pressure detection tube is connected to the contrast injection tube only when blood pressure is detected. While allowing high pressure injection, it also prevents transducer breakage.
[0012]
The above-described liquid injector is proposed and filed by, for example, the present applicant (for example, see Patent Documents 1 to 5).
[0013]
[Patent Document 1]
JP-A-11-342209 [Patent Document 2]
JP-A-11-094103 [Patent Document 3]
JP 07-100212 [Patent Document 4]
JP-A-06-030905 [Patent Document 5]
JP 2001-104492 A
[Problems to be solved by the invention]
In the drug solution injection device to which the above-described transducer is added, the contrast agent can be injected into the subject at high pressure, and the blood pressure of the subject can be detected by the transducer. However, in order to protect the transducer from the high pressure of the contrast agent, it is necessary to operate the switching valve when injecting the contrast agent and when detecting the blood pressure, as described above, and the operation is complicated.
[0015]
In particular, in the above-described liquid injector, it is necessary to operate the switching valve both when the contrast agent is sucked into the liquid syringe from the contrast tank and when the contrast agent is injected from the liquid syringe into the subject. That is, since it is necessary to operate a plurality of switching valves for each of various states, the operation is extremely complicated, and erroneous operation is highly likely to occur.
[0016]
The present invention has been made in view of the above-described problems, and provides a drug solution injector that can inject a drug solution into a subject at a high pressure without requiring a switching operation of a switching valve and that can prevent the blood pressure detection mechanism from being destroyed. The purpose is to do.
[0017]
[Means for Solving the Problems]
A first liquid medicine injection device of the present invention is a liquid medicine injection device for injecting at least a liquid medicine as a liquid into a blood vessel of a human body in which blood flows as a liquid, a liquid medicine pump mechanism, a blood pressure detection mechanism, a saline pressurized container, It has an inhalation regulation mechanism, a drug solution infusion tube, an infusion regulation mechanism, a blood pressure detection tube, a tube blocking mechanism, a saline infusion tube, and an infusion operation mechanism.
[0018]
The drug solution pump mechanism injects the drug solution into the blood vessel, and the saline pressurized container is pre-stored with physiological saline pressurized to a predetermined pressure higher than normal blood pressure, and the blood pressure detection mechanism flows through the blood vessel. Detect the pressure of the blood to be applied. The drug solution injection tube has a distal end connected to the drug solution pump mechanism and a distal end connected to the blood vessel, and the injection control mechanism is inserted into the drug solution injection tube to control the movement of the drug solution from the drug solution pump mechanism to the blood vessel. . The blood pressure detecting tube has a distal end connected to the blood pressure detecting mechanism, a distal end connected to a position on the distal end side of the injection regulating mechanism of the drug solution injecting tube, and a tube shut-off mechanism inserted into the blood pressure detecting tube so that a normal blood pressure detecting tube is inserted. When a predetermined pressure that is higher than the blood pressure and lower than the pressurization of the saline pressurizer acts, the movement of the liquid is blocked. The saline infusion tube has a distal end connected to the saline pressurized container and a distal end connected to a position closer to the distal end than the tube shutoff mechanism of the blood pressure detection tube. However, when a predetermined pressure that is higher than the pressurization of the saline pressurization container and lower than the pressure resistance of the blood pressure detection mechanism acts, the movement of the liquid is allowed.
[0019]
Therefore, in the drug solution injection device of the present invention, the movement of the drug solution by the drug solution injection tube is regulated in the direction from the drug solution pump mechanism to the blood vessel by the injection regulation mechanism, so that the drug solution is not required to switch the switching valve. Is injected into the blood vessel of the subject by a chemical pump mechanism. At this time, the pressure of the liquid medicine to be injected is higher than the pressurization of the saline pressurized container, and the tube blocking mechanism blocks the blood pressure detection tube at that pressure, so that the high-pressure liquid medicine does not flow into the blood pressure detection tube.
[0020]
In addition, saline is pressurized by a saline pressurized container, and at that pressure, the saline infusion tube is closed by the infusion operation mechanism, so that the saline usually flows from the saline infusion tube to a blood pressure detection tube or the like. do not do. When the injection operation mechanism is manually opened, the physiological saline pressurized by the saline pressurized container flows out of the saline injection tube into the blood pressure detection tube.
[0021]
However, at that pressure, the blood pressure detection tube is blocked by the tube blocking mechanism in the vicinity of the distal end, so that the physiological saline fills the saline injection tube and the blood pressure detection tube without flowing out to the drug solution injection tube. As described above, when the blood pressure detection tube is filled with the physiological saline and the medicinal solution injection tube is filled with the medicinal solution, when the medicinal solution is injected as described above, the high pressure is cut off by the tube shutoff mechanism to detect the blood pressure. When the medicinal solution is not injected without acting on the mechanism, the pressure of the blood flowing through the blood vessel is detected by the blood pressure detecting mechanism without being blocked by the tube blocking mechanism.
[0022]
Therefore, the high-pressure injection of the drug solution by the drug solution injection tube and the detection of the blood pressure by the blood pressure detection mechanism are performed without the need for the switching operation of the switching valve. Furthermore, even if a high-pressure drug solution breaks through the tube shut-off mechanism, the drug solution at that pressure breaks through the injection operation mechanism and flows back from the saline injection tube to the saline pressurized container. do not do.
[0023]
The second drug solution injection device of the present invention also has a drug solution container, a drug solution suction tube, and a suction control mechanism. The drug solution container contains a large volume of drug solution in advance, and the drug solution pump mechanism sucks a small volume of drug solution from the drug solution container and injects it into a blood vessel. The drug solution suction tube has a distal end connected to the drug solution storage container and a distal end connected to the drug solution pump mechanism. The suction control mechanism is inserted into the drug solution suction tube and moves the drug solution from the drug solution storage container to the drug solution pump mechanism. Regulate in the direction to.
[0024]
Therefore, in the drug solution injection device of the present invention, the movement of the drug solution by the drug solution suction tube is restricted by the suction control mechanism in the direction from the drug solution storage container to the drug solution pump mechanism, and the movement of the drug solution by the drug solution injection tube is controlled by the injection control mechanism. Since the liquid is regulated in the direction from the liquid chemical pump mechanism to the blood vessel, the liquid chemical is sucked from the liquid medicine storage container by the liquid chemical pump mechanism and injected into the blood vessel of the subject without requiring a switching operation of the switching valve.
[0025]
It should be noted that the various components referred to in the present invention do not need to exist independently of each other, and that a plurality of components are formed as one member, and a certain component is a part of another component. It is also possible that some of the components overlap with some of the other components.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
[Configuration of Embodiment]
An embodiment of a drug solution injector according to the present invention will be described below with reference to the drawings. The liquid injector 100 of this embodiment includes a contrast tank 101 as a liquid container, a raw bag 102 as a pressurized saline container, a liquid syringe 103 as a liquid pump, a transducer 104 as a blood pressure detecting mechanism, and a liquid suction tube. It has a contrast inhalation tube 106, a contrast solution infusion tube 107 which is a drug solution infusion tube, a blood pressure detection tube 108, a saline infusion tube 109, and the like as main parts.
[0027]
The contrast tank 101 previously contains a large volume of a contrast agent as a liquid drug solution, and the saline bag 102 has a liquid saline at a higher pressure than the normal blood pressure of “90 to 140 (mmHg)”. Is pressurized to “300 (mmHg)” and stored in advance. In the chemical syringe 103, a piston member 112 is slidably inserted into a small-capacity cylinder member 111, and the transducer 104 detects the pressure of blood flowing through a blood vessel (not shown) of the subject.
[0028]
The contrast suction tube 106 has a distal end connected to the contrast tank 101 and a distal end connected to the liquid syringe 103. However, a one-way valve 114 serving as an inhalation regulating mechanism is inserted into the contrast inhalation tube 106, and the one-way valve 114 regulates the movement of the contrast agent in the direction from the contrast tank 101 to the liquid syringe 103.
[0029]
The contrast injection tube 107 has a catheter 115 having a distal end connected to the drug solution syringe 103 and a distal end connected to a blood vessel. However, a one-way valve 116, which is an injection control mechanism, is also inserted in the vicinity of the end of the contrast injection tube 107, and the one-way valve 116 restricts the movement of the contrast agent from the liquid syringe 103 to the blood vessel.
[0030]
Therefore, when the piston member 112 is withdrawn from the cylinder member 111 of the liquid syringe 103, the contrast agent is sucked from the contrast tank 101 into the liquid syringe 103 at a negative pressure, and when the piston member 112 is pushed into the cylinder member 111, the liquid syringe is pressed. From 103, a contrast medium is injected into the blood vessel at a positive pressure.
[0031]
The blood pressure detection tube 108 has a distal end connected to the distal end side of the one-way valve 116 of the contrast injection tube 107 and a distal end connected to the transducer 104. The blood pressure detection tube 108 has a degassing syringe 121 connected to the vicinity of the end by a three-way cock 119, and a switching valve 122 serving as a tube shutoff mechanism inserted near the tip.
[0032]
The three-way cock 119 switches between a state in which the blood pressure detection tube 108 is communicated and a state in which the distal end side of the blood pressure detection tube 108 is closed and the degassing syringe 121 is communicated with the distal end side. The degassing syringe 121 removes air bubbles mixed in the blood pressure detection tube 108 by, for example, inhaling the physiological saline filled in the blood pressure detection tube 108.
[0033]
The switching valve 122 blocks the movement of the liquid when a predetermined pressure acts, and allows the liquid having a pressure lower than the predetermined pressure to move. The predetermined pressure is set higher than the normal blood pressure and lower than the pressurization of the raw bag 102, and is, for example, "250 (mmHg)".
[0034]
The saline infusion tube 109 has a distal end connected to the saline bag 102, and a distal end connected to a distal end side of the switching valve 122 of the blood pressure detection tube 108 via a Y connector 123. A flushing device 124, which is an injection operation mechanism, is inserted into the saline injection tube 109. The flushing device 124 closes the saline injection tube 109 so that it can be opened and closed manually. When a predetermined pressure higher than the pressure acts, movement of the liquid is allowed.
[0035]
[Operation of Embodiment]
In the configuration as described above, the liquid injector 100 of the present embodiment injects a contrast medium into a blood vessel of a subject, which is imaged by a fluoroscopic imaging device such as an angio apparatus or an MRA apparatus, and simultaneously injects a blood vessel into which the contrast medium is injected. It is used to detect the blood pressure of a person in real time.
[0036]
The procedure for using the drug solution injector 100 will be specifically described below, but the procedure is merely an example, and various procedures can be performed at an actual site. First, in a state where the catheter 115 of the contrast injection tube 107 is not connected to the subject, the worker connects the contrast tank 101 to the contrast injection tube 106 and connects the saline bag 102 to the saline injection tube 109.
[0037]
When the piston member 112 of the liquid syringe 103 is retracted in such a state, the contrast agent is sucked from the contrast tank 101 to the cylinder member 111 of the liquid syringe 103 by the contrast injection tube 106 due to the negative pressure. Next, when the piston member 112 of the liquid syringe 103 is advanced, the contrast injection tube 107 is filled with the contrast agent from the cylinder member 111 of the liquid syringe 103.
[0038]
Since the saline solution is pressurized in the saline bag 102, when the flushing device 124 is manually opened and the degassing syringe 121 is manually sucked at the same time, the saline bag 102 and the blood pressure detection from the saline bag 102 are detected. The tube 108 is filled with physiological saline.
[0039]
As a result, air is removed from the inside of all the tubes 106 to 109 of the drug solution injector 100, and the catheter 115 of the contrast injection tube 107 is connected to the blood vessel of the subject. In this state, when the piston member 112 of the liquid syringe 103 is retracted, the contrast medium is sucked from the contrast tank 101 to the cylinder member 111 by the contrast injection tube 106, and when the piston member 112 is advanced, the contrast injection tube 107 is removed from the cylinder member 111. Is injected into the blood vessel of the subject.
[0040]
Further, since the path from the catheter 115 to the transducer 104 is also filled with the contrast agent and the physiological saline, the pressure of the blood flowing through the blood vessel is transmitted to the transducer 104 when the contrast agent is not injected, and the transducer 104 , The blood pressure is directly detected.
[0041]
[Effects of Embodiment]
In the liquid injector 100 of the present embodiment, the contrast agent can be injected into the blood vessel of the subject as described above, and the blood pressure of the subject can also be detected. However, although the pressure resistance of the transducer 104 for detecting blood pressure is low, the contrast agent is injected at a high pressure by the liquid syringe 103.
[0042]
However, in the liquid injector 100 of the present embodiment, the high pressure of the contrast agent may act on the transducer 104 by the switching valve 122 inserted into the blood pressure detection tube 108 and the flushing device 124 inserted into the saline injection tube 109. Has been prevented.
[0043]
More specifically, when the contrast medium is injected from the liquid syringe 103 into the blood vessel of the subject through the contrast injection tube 107 as described above, the high pressure of the contrast medium acts on the switching valve 122. However, as described above, the switching valve 122 interrupts the flow of the liquid when a predetermined pressure higher than the normal blood pressure and lower than the pressurization of the saline bag 102 acts, so that the high pressure of the contrast agent acts on the transducer 104. Not be destroyed.
[0044]
Nevertheless, when no contrast agent is injected, the switching valve 122 allows conduction of the blood pressure, so that the transducer 104 can detect the blood pressure. For this reason, in the liquid injector 100 of this embodiment, it is possible to achieve both high-pressure injection of the contrast agent and prevention of breakage of the transducer 104 without the need to switch the switching valve.
[0045]
In addition, even if a high-pressure contrast agent breaks through the switching valve 122, the flushing device 124 allows the liquid to move when a predetermined pressure higher than the pressurization of the saline bag 102 and lower than the pressure resistance of the transducer 104 acts. Therefore, the high pressure of the contrast agent that has passed through the switching valve 122 flows out of the flushing device 124 to the saline bag 102 by the saline injection tube 109, and the transducer 104 can be reliably prevented from being broken.
[0046]
In addition, the flushing device 124 is used to operate the operation of filling the blood pressure detection tube 108 with the physiological saline from the raw bag 102, and the switching valve 122 is used to perform the contrast injection of the physiological saline filled in the blood pressure detection tube 108. Since it is also used to prevent the outflow to the tube 107, it is possible to prevent the transducer 104 from being destroyed without waste with a simple structure as a whole.
[0047]
[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and allows various modifications without departing from the gist thereof. For example, in the above-described embodiment, the one-way valves 114 and 116 are inserted one by one into the contrast inhalation tube 106 and the contrast infusion tube 107, but such one-way valves 114 and 116 are inserted in a double triple. It is also possible to add an electric shutoff mechanism 201 for electrically shutting off the contrast inhalation tube 106 and the contrast injection tube 107 as shown in FIG.
[0048]
In the above embodiment, the contrast injection tube 107 is evacuated with the contrast agent injected from the liquid syringe 103. However, the deaeration syringe 204 is connected to the contrast injection tube 107 by a three-way cock 203, and the deaeration syringe is connected to the contrast injection tube 107. 204 can also be used for deaeration of the contrast injection tube 107.
[0049]
Further, in the above embodiment, the contrast injection tube 107 and the blood pressure detection tube 108 are directly connected to each other, but these may be connected by the three-way cock 206. Further, in the above-described embodiment, for the sake of simplicity, the distal end portion of the contrast injection tube 107 is simply constituted by the catheter 115. However, in an actual liquid injector, a guide wire insertion mechanism is inserted into the distal end portion of the catheter 115. Etc. can be added (not shown).
[0050]
Furthermore, in the above-described embodiment, the chemical injection device 100 has been described as a single device. However, the contrast tank 101, the raw bag 102, and the like are naturally mounted and replaced at the site. For this reason, when actually using the liquid injector 100 of this embodiment as a product, the contrast tank 101, the saline bag 102, the liquid syringe 103, the transducer 104, the catheter 115, and the like are removed, and the contrast inhalation tube 106, the contrast injection tube 107, and the like. , A tube unit (not shown) composed of a blood pressure detection tube 108, a saline infusion tube 109, and the like.
[0051]
In the above embodiment, the liquid injector 100 also has the contrast tank 101 and the contrast suction tube 106, and the contrast agent inhaled from the contrast tank 101 with the liquid syringe 103 is injected into the subject with the contrast injection tube 107. Does not have the contrast tank 101 and the contrast inhalation tube 106, but a liquid injector (not shown) for injecting only the contrast agent containing the liquid syringe 103 in advance into the subject through the contrast injection tube 107. Is also feasible.
[0052]
In addition, it is preferable that the tube unit corresponding to such a drug solution injecting device includes the contrast infusion tube 107, the blood pressure detection tube 108, the saline infusion tube 109, and the like without naturally having the contrast inhalation tube. Not shown).
[0053]
Furthermore, in the above-described embodiment, an example is described in which a medical solution is injected into a subject to be imaged by a fluoroscopic imaging apparatus such as an angiography apparatus or an MRA apparatus by the liquid injector 100. However, such a fluoroscopic imaging apparatus includes a CT scanner, an MRI apparatus , PET device, ultrasonic diagnostic device, etc. are also possible.
[0054]
【The invention's effect】
In the drug solution injection device of the present invention, when the drug solution is injected into the subject through the drug solution injection tube, the high-pressure drug solution does not flow into the blood pressure detection tube by the tube blocking mechanism, so that the drug solution is not required to switch the switching valve. Can prevent the high pressure from acting on the blood pressure detection mechanism, even if the high-pressure chemical breaks through the tube shut-off mechanism, the chemical at that pressure breaks through the injection operation mechanism and moves from the saline injection tube to the saline pressurized container. Since the liquid flows backward, the high pressure of the chemical does not act on the blood pressure detecting mechanism, and it is possible to prevent the blood pressure detecting mechanism having a structurally low pressure resistance from being destroyed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall structure of a drug solution injector according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the entire structure of a modification of the liquid injector.
[Explanation of symbols]
REFERENCE SIGNS LIST 100 Chemical liquid injection device 101 Contrast tank that is a chemical liquid storage container 102 Raw food bag that is a raw food pressurized container 103 Chemical liquid syringe that is a chemical liquid pump mechanism Transducer that is a blood pressure detection mechanism 106 Contrast suction tube that is a chemical liquid suction tube 107 Chemical liquid injection tube Certain contrast injection tube 108 Blood pressure detection tube 109 Saline injection tube 111 Cylinder member 112 Piston member 114 One-way valve 116 that is an inhalation control mechanism One-way valve 122 that is an injection control mechanism Switching valve 124 that is a tube shutoff mechanism

Claims

A drug solution injector for injecting at least a drug solution as a liquid into a blood vessel of a human body in which blood is flowing as a liquid,
A drug solution pump mechanism for injecting the drug solution into the blood vessel,
A saline pressurized container in which the physiological saline is pressurized to a predetermined pressure higher than the normal blood pressure and stored in advance,
A blood pressure detection mechanism for detecting the pressure of blood flowing through the blood vessel,
A drug solution injection tube having a distal end connected to the drug solution pump mechanism and a distal end connected to the blood vessel,
An injection restricting mechanism inserted into the liquid injection tube and restricting the movement of the liquid in the direction from the liquid pump to the blood vessel;
A blood pressure detection tube having a distal end connected to the blood pressure detection mechanism and a distal end connected to a position on the distal end side of the liquid injection tube from the injection regulating mechanism,
A tube shutoff mechanism that is inserted into the blood pressure detection tube and shuts off the movement of the liquid when a predetermined pressure that is higher than normal blood pressure and lower than the pressurization of the saline pressurized container acts,
A saline infusion tube having a distal end connected to the saline pressurized container and a distal end connected to a position closer to the distal end than the tube blocking mechanism of the blood pressure detection tube;
The saline injection tube is manually opened and closed so as to be openable and closable, but when a predetermined pressure higher than the pressurization of the saline pressurization container and lower than the pressure resistance of the blood pressure detection mechanism acts, the injection operation for allowing the movement of the liquid. Mechanism and
A liquid injector.

A drug solution injector for injecting at least a drug solution as a liquid into a blood vessel of a human body in which blood is flowing as a liquid,
A large-capacity drug solution container in which the drug solution is stored in advance,
A small-capacity drug pump mechanism for inhaling the drug solution from the drug solution container and injecting the solution into the blood vessel;
A saline pressurized container in which the physiological saline is pressurized to a predetermined pressure higher than the normal blood pressure and stored in advance,
A blood pressure detection mechanism for detecting the pressure of blood flowing through the blood vessel,
A drug solution suction tube having a distal end connected to the drug solution storage container and a distal end connected to the drug solution pump mechanism;
An inhalation regulating mechanism inserted into the medicinal solution suction tube to regulate movement of the medicinal solution in a direction from the medicinal solution container to the medicinal solution pump mechanism;
A drug solution injection tube having a distal end connected to the drug solution pump mechanism and a distal end connected to the blood vessel,
An injection restricting mechanism inserted into the liquid injection tube and restricting the movement of the liquid in the direction from the liquid pump to the blood vessel;
A blood pressure detection tube having a distal end connected to the blood pressure detection mechanism and a distal end connected to a position on the distal end side of the liquid injection tube from the injection regulating mechanism,
A tube shutoff mechanism that is inserted into the blood pressure detection tube and shuts off the movement of the liquid when a predetermined pressure that is higher than normal blood pressure and lower than the pressurization of the saline pressurized container acts,
A saline infusion tube having a distal end connected to the saline pressurized container and a distal end connected to a position closer to the distal end than the tube blocking mechanism of the blood pressure detection tube;
The saline injection tube is manually opened and closed so as to be openable and closable, but when a predetermined pressure higher than the pressurization of the saline pressurization container and lower than the pressure resistance of the blood pressure detection mechanism acts, the injection operation for allowing the movement of the liquid. Mechanism and
A liquid injector.

3. The liquid injector according to claim 1, wherein the liquid pump mechanism includes a liquid syringe in which a piston member is slidably inserted into a cylinder member. 4.

The liquid injector according to any one of claims 1 to 3, wherein an air removing mechanism for removing air mixed in from the liquid is connected to the liquid injector tube via a switching valve.

The drug solution injection device according to any one of claims 1 to 4, wherein an air removal mechanism for removing air mixed in from the liquid is connected to the blood pressure detection tube via a switching valve.

A tube unit for the drug solution injector according to claim 1,
A drug solution injection tube having a distal end connected to the drug solution pump mechanism and a distal end connected to the blood vessel,
An injection restricting mechanism inserted into the liquid injection tube and restricting the movement of the liquid in the direction from the liquid pump to the blood vessel;
A blood pressure detection tube having a distal end connected to the blood pressure detection mechanism and a distal end connected to a position on the distal end side of the liquid injection tube from the injection regulating mechanism,
A tube shutoff mechanism that is inserted into the blood pressure detection tube and shuts off the movement of the liquid when a predetermined pressure that is higher than normal blood pressure and lower than the pressurization of the saline pressurized container acts,
A saline infusion tube having a distal end connected to the saline pressurized container and a distal end connected to a position closer to the distal end than the tube blocking mechanism of the blood pressure detection tube;
The saline injection tube is manually opened and closed so as to be openable and closable, but when a predetermined pressure higher than the pressurization of the saline pressurization container and lower than the pressure resistance of the blood pressure detection mechanism acts, the injection operation for allowing the movement of the liquid. Mechanism and
A tube unit.

A tube unit for the drug solution injector according to claim 2,
A drug solution suction tube having a distal end connected to the drug solution storage container and a distal end connected to the drug solution pump mechanism;
An inhalation regulating mechanism inserted into the medicinal solution suction tube to regulate movement of the medicinal solution in a direction from the medicinal solution container to the medicinal solution pump mechanism;
A drug solution injection tube having a distal end connected to the drug solution pump mechanism and a distal end connected to the blood vessel,
An injection restricting mechanism inserted into the liquid injection tube and restricting the movement of the liquid in the direction from the liquid pump to the blood vessel;
A blood pressure detection tube having a distal end connected to the blood pressure detection mechanism and a distal end connected to a position on the distal end side of the liquid injection tube from the injection regulating mechanism,
A tube shutoff mechanism that is inserted into the blood pressure detection tube and shuts off the movement of the liquid when a predetermined pressure that is higher than normal blood pressure and lower than the pressurization of the saline pressurized container acts,
A saline infusion tube having a distal end connected to the saline pressurized container and a distal end connected to a position closer to the distal end than the tube blocking mechanism of the blood pressure detection tube;
The saline injection tube is manually opened and closed so as to be openable and closable, but when a predetermined pressure higher than the pressurization of the saline pressurization container and lower than the pressure resistance of the blood pressure detection mechanism acts, the injection operation for allowing the movement of the liquid. Mechanism and
A tube unit.