JPH07246241A - Blood vessel insertion means for medical treatment - Google Patents
Blood vessel insertion means for medical treatmentInfo
- Publication number
- JPH07246241A JPH07246241A JP6065573A JP6557394A JPH07246241A JP H07246241 A JPH07246241 A JP H07246241A JP 6065573 A JP6065573 A JP 6065573A JP 6557394 A JP6557394 A JP 6557394A JP H07246241 A JPH07246241 A JP H07246241A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- blood vessel
- outer tube
- inner tube
- tip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Media Introduction/Drainage Providing Device (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は経皮的に血管へ導入され
る医療のための挿入具、即ちカテーテルイントロデュー
サまたは留置針に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical instrument for percutaneously introducing into a blood vessel, that is, a catheter introducer or an indwelling needle.
【0002】[0002]
【従来の技術】血管や臓器の診断或いは治療のためのカ
テーテルを血管へ経皮的に導入することに用いられるカ
テーテルイントロデューサは、細径の拡張管(ダイレー
タ)とシースとからなり、それらの基端のハブを互いに
結合して拡張管をシースに先端部を突出させて挿通し、
予め血管に挿入しておいたガイドワイヤに拡張管を嵌装
して体内に刺し込み、シースを血管に導入してからガイ
ドワイヤと拡張管とを抜取り、そしてカテーテルをシー
スに挿入して目的部位に到達させるものである。また、
輸血や輸液或いは反対に脱血や脱液のため血管や胆管な
どに穿刺留置される留置針は、穿刺用の内針と留置用の
カニューレ(キャセータ)とからなり、それらの基端の
針基とハブとを互いに結合して内針をカニューレに先端
部を突出させて挿通し、内針によって目的部位まで穿刺
してから内針を抜取り、そして血液や薬液の容器または
吸引器或いは人工腎臓回路をカニューレに接続するもの
である。2. Description of the Related Art A catheter introducer used for percutaneously introducing a catheter for diagnosing or treating a blood vessel or organ into a blood vessel is composed of a dilation tube having a small diameter and a sheath. Connect the proximal hubs to each other and insert the expansion tube into the sheath with the tip protruding.
A guide wire previously inserted into a blood vessel is fitted with an expansion tube and inserted into the body, the sheath is introduced into the blood vessel, the guide wire and the expansion tube are removed, and then the catheter is inserted into the sheath and the target site is inserted. To reach. Also,
An indwelling needle that is punctured and placed in a blood vessel or a bile duct for blood transfusion or infusion, or conversely, for blood removal or effusion, consists of an inner needle for puncture and a cannula (catheter) for indwelling. And hub are connected to each other, the inner needle is inserted through the cannula with the tip protruding, the inner needle is punctured to the target site, and then the inner needle is withdrawn, and then a container or aspirator for blood or drug solution or an artificial kidney circuit. Is connected to the cannula.
【0003】即ち、これらは内管である拡張管または内
針と外管であるシースまたはカニューレとの二層構造で
あって、内管が外管よりも前方へ突出している状態で人
体に刺し込まれる。従って、外管の先端縁がかどばった
段を形成している形状を呈しており(カテーテルイント
ロデューサにあっては実開平1−112849号公報、
留置針にあっては実開平5−35149号公報参照)、
穿刺の際に組織に引掛かって挿入の妨げになったり、組
織を必要以上に大きく傷付ける、ということがある。That is, these have a two-layer structure of an expansion tube or an inner needle which is an inner tube and a sheath or a cannula which is an outer tube, and are pierced into a human body in a state where the inner tube is projected more forward than the outer tube. Get caught. Therefore, the outer tube has a shape in which the tip edge of the outer tube forms a rounded step (in the case of a catheter introducer, Japanese Utility Model Publication No. 1-112849,
For an indwelling needle, see Japanese Utility Model Laid-Open No. 5-35149).
When puncturing, the tissue may be caught and hinder the insertion, or the tissue may be damaged more than necessary.
【0004】一方、カテーテルにおいては導入距離が長
いことを考慮して先端部分を除き全体的にかなりの硬さ
をもたせることが要求されており、そのために互いに密
着させた内管と外管との二層構造とし内管を外管よりも
前方へ突出させるとともに外管の先端部を先端へ向け小
径となるようになめらかに傾斜させ先端を内管外径と等
しくしたカテーテルが提案されている(実公平4−12
992号公報参照)。このようにすると、外管はかどば
った先端縁をもたないので円滑に挿入できるとともに組
織を必要以上に傷付けるという心配が解消される。On the other hand, in consideration of the long introduction distance, it is required for the catheter to have a considerable hardness as a whole except for the distal end portion. Therefore, the inner tube and the outer tube, which are in close contact with each other, are required. A catheter having a two-layer structure has been proposed in which the inner tube is projected more forward than the outer tube, and the tip of the outer tube is gently inclined toward the tip to have a small diameter so that the tip is equal to the outer diameter of the inner tube ( Actual fairness 4-12
992). In this way, the outer tube does not have a rounded leading edge, so that the outer tube can be inserted smoothly and the fear of unnecessarily damaging the tissue is eliminated.
【0005】しかしながら、実際には外管の先端部を先
端縁に段がないようになめらかに成形するのはきわめて
困難であり、また仮に段がないように成形できても、カ
テーテルイントロデューサや留置針のように挿入後に内
管および外管の一方を抜取るものにおいては、これらの
間にわずかな隙間があると薄肉化されている外管先端が
組織に引掛かってかどばった段を有するものと同じ結果
を招いてしまう。従って、内管と外管とを密着一体化し
た前記カテーテルにおける考えを挿入後に内管および外
管の一方を抜取る形式の血管挿入具に適用するのは得策
でない。However, in practice, it is extremely difficult to form the tip portion of the outer tube smoothly without any step at the tip edge, and even if the outer tube can be formed so as to have no step, a catheter introducer or an indwelling device can be used. In the case of removing one of the inner tube and the outer tube after insertion like a needle, if there is a slight gap between them, the outer tube tip, which is thinned, has a step that is caught by the tissue and has a step. You get the same result. Therefore, it is not advisable to apply the idea of the catheter in which the inner tube and the outer tube are closely integrated to each other to a vascular insertion tool of a type in which one of the inner tube and the outer tube is withdrawn after the insertion.
【0006】[0006]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、内管と外管との二層構造であって内管が外
管に先端部を突出させて挿通されており、経皮的に血管
に導入した後にいずれか一方が抜取られる構造の医療用
血管挿入具がもってっている外管先端が挿入の妨げとな
ったり組織を徒らに傷付けたりすることがある、という
点である。SUMMARY OF THE INVENTION The problem to be solved by the present invention is a two-layer structure of an inner tube and an outer tube, wherein the inner tube is inserted into the outer tube with its tip portion protruding, The point that the outer tube tip of the medical blood vessel insertion tool that has a structure in which either one is removed after being introduced into the blood vessel by the skin may interfere with the insertion or may damage the tissue to people. Is.
【0007】[0007]
【課題を解決するための手段】本発明は前記課題を解決
し、組織を徒らに傷付けることなく円滑に挿入すること
ができる医療用血管挿入具を提供することを目的とする
ものであって、内管の先端部に環状の溝を設けるととも
に外管の先端縁部を内側へ湾曲して絞り、溝に絞り部を
嵌入して外管の先端縁を内管の外径内に位置させる構成
とした。尚、この構成は拡張管を内管とするとともにシ
ースを外管とし血管導入後に拡張管を抜取るようにした
カテーテルイントロデューサ、または内針を内管とする
とともにカニューレを外管とし血管導入後に内針を抜取
るようにした留置針に適用される。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a medical blood vessel insertion instrument which can smoothly insert a tissue without damaging the tissue. , Providing an annular groove at the tip of the inner pipe and curving the tip edge of the outer pipe inward, and inserting the throttle portion into the groove to position the tip edge of the outer pipe within the outer diameter of the inner pipe It was configured. In this configuration, a catheter introducer that uses an expansion tube as an inner tube, a sheath as an outer tube, and an expansion tube is removed after introducing a blood vessel, or an inner needle as an inner tube and a cannula as an outer tube after introducing the blood vessel It is applied to indwelling needles with the inner needle removed.
【0008】[0008]
【作用】外管の先端縁部の絞り部を内管の溝に嵌入した
状態で両者一体に経皮的に血管に導入する。このとき、
外管の先端縁は溝に嵌入して内管の外径内に位置してい
るとともに外管の先端縁部は内側へ湾曲した曲面となっ
ているためかどばった段部が存在せず、このため抵抗が
小さく円滑に挿入され且つ組織を徒らに傷付けることな
く所定位置まで導入されることとなる。Operation: The outer tube is percutaneously introduced into the blood vessel in a state in which the narrowed portion at the tip edge portion is fitted into the groove of the inner tube and is integrally put together. At this time,
Since the tip edge of the outer tube is fitted into the groove and is located within the outer diameter of the inner tube, and the tip edge of the outer tube has a curved surface that curves inward, there is no rounded step. Therefore, the resistance is small and the insertion is smooth, and the tissue is introduced to a predetermined position without damaging the tissue.
【0009】[0009]
【実施例】図面を参照して本発明の実施例を説明する
と、図1はカテーテルイントロデューサに本発明を適用
した実施例であって、軟質合成樹脂で作られた細径の拡
張管である内管1と、同じく軟質合成樹脂で作られた細
径のシースである外管5とからなり、それらの基部の図
示しないハブを互いに結合することにより内管1が外管
5に先端部を突出させて挿通されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an embodiment in which the present invention is applied to a catheter introducer, which is a small-diameter expansion tube made of a soft synthetic resin. The inner tube 1 and the outer tube 5, which is also a thin sheath made of a soft synthetic resin, are connected to each other by connecting hubs (not shown) at their bases to the outer tube 5 so that the outer tube 5 has a distal end portion. It is projected and inserted.
【0010】内管1の先端部は先端へ向かって小径とな
るテーパが付されており、先端内径はガイドワイヤの径
と等しくされている。また、このテーパ部2の始まり部
分に断面ほぼV形であって環状の溝3が設けられてい
る。The tip of the inner tube 1 is tapered so that the diameter becomes smaller toward the tip, and the inner diameter of the tip is made equal to the diameter of the guide wire. An annular groove 3 having a substantially V-shaped cross section is provided at the beginning of the tapered portion 2.
【0011】外管5は内管1にほぼ隙間なくかぶせら
れ、先端縁部が内側へ湾曲して絞られていて、この絞り
部6が溝3にその基端側周壁3aに沿って嵌入し、先端
縁7が内管1の外径内に位置して溝3の先端側周壁面3
bに接している。The outer tube 5 is covered with the inner tube 1 with almost no clearance, and the tip edge is curved inwardly and is squeezed, and the squeezed portion 6 is fitted in the groove 3 along the peripheral wall 3a on the base end side. , The tip edge 7 is located within the outer diameter of the inner tube 1, and the tip side peripheral wall surface 3 of the groove 3 is
It touches b.
【0012】このような構成の本実施例は、従来のカテ
ーテルイントロデューサと全く同様に、予め血管に挿入
しておいたガイドワイヤに拡張管である内管1を嵌装し
て体内に刺し込むことにより、一体となって刺し込まれ
るシースである外管5を血管に導入し、次にガイドワイ
ヤと内管1とを抜取ってからカテーテルを外管5に挿入
し目的部位まで誘導させるものである。In this embodiment having such a structure, just like the conventional catheter introducer, the inner tube 1 which is an expansion tube is fitted into the guide wire previously inserted into the blood vessel and inserted into the body. In this way, the outer tube 5 which is a sheath to be inserted as a unit is introduced into the blood vessel, and then the guide wire and the inner tube 1 are removed, and then the catheter is inserted into the outer tube 5 and guided to the target site. Is.
【0013】外管5は先端縁7が先端側周壁面4に接し
て溝3の内部に隠され、且つ先端縁部が内側へ湾曲した
絞り部6とされてかどばった段部が存在しない状態で内
管1にかぶせられているので、刺し込みの際に組織に引
掛かることがなく小さい抵抗で円滑に挿入できるととも
に組織を必要以上に傷付けるということもない。The outer tube 5 is in a state where the tip edge 7 is hidden in the groove 3 by contacting the tip side peripheral wall surface 4, and the tip edge portion is formed as a narrowed portion 6 which is curved inward, so that there is no stepped portion. Since it is covered with the inner tube 1, the tissue is not caught at the time of insertion and the tissue can be smoothly inserted with a small resistance and the tissue is not damaged more than necessary.
【0014】また、内管1を抜取る際に外管5の絞り部
6は先端側周壁面4により押し拡げられて溝3から脱出
し、内管1が抜取られた後は自身の弾性力で再び内側へ
湾曲した状態に戻る。このため、内管抜取りやカテーテ
ル挿入の際に外管5が動いても、先端縁7が絞り部6に
よって外管5の外径内に位置していることにより、血管
壁を傷付け或いは剥離させるということがなく安全であ
る。When the inner pipe 1 is pulled out, the narrowed portion 6 of the outer pipe 5 is pushed out by the peripheral wall surface 4 on the tip side and escapes from the groove 3, and after the inner pipe 1 is pulled out, its own elastic force. Press again to return to the inward curved state. Therefore, even if the outer tube 5 moves during removal of the inner tube or insertion of the catheter, the distal end edge 7 is positioned within the outer diameter of the outer tube 5 by the narrowed portion 6, so that the blood vessel wall is damaged or peeled off. There is no such thing and it is safe.
【0015】図2は留置針に本発明を適用した実施例で
あって、金属で作られた細径の内針である内管11と、
軟質合成樹脂で作られた細径のカニューレである外管1
5とからなり、これらの基部の図示しない針基とハブと
を互いに結合することにより内管11が外管15に先端
部を突出させて挿通されている。FIG. 2 shows an embodiment in which the present invention is applied to an indwelling needle, and an inner tube 11 which is an inner needle having a small diameter made of metal,
Outer tube 1 which is a small diameter cannula made of soft synthetic resin
5, the inner tube 11 is inserted into the outer tube 15 with its tip protruding by connecting a needle base (not shown) of these bases and a hub to each other.
【0016】内管11の先端は穿刺用の刃部12を形成
しており、その少し基端側に断面ほぼV形であって環状
の溝13が設けられている。A puncture blade 12 is formed at the tip of the inner tube 11, and an annular groove 13 having a substantially V-shaped cross section is provided at a slightly proximal end thereof.
【0017】外管15は内管11にほぼ隙間なくかぶせ
られ、先端縁部が内側へ湾曲して絞られていて、この絞
り部16が溝13にその基端側周壁3aに沿って嵌入
し、先端縁17が内管11の外径内に位置して溝13の
先端側周壁面13bに接している。The outer tube 15 is covered with the inner tube 11 with almost no clearance, and the tip edge portion is curved inwardly and squeezed, and the squeezed portion 16 is fitted in the groove 13 along the peripheral wall 3a on the base end side. The tip edge 17 is located within the outer diameter of the inner pipe 11 and is in contact with the tip side peripheral wall surface 13 b of the groove 13.
【0018】このような構成の本実施例は、従来の留置
針と全く同様に径皮的に血管に穿刺し、次に内針である
内管11を抜取ってカニューレである外管15を留置し
た状態で血液や薬液の容器または吸引器或いは人工腎臓
回路を接続するものである。In this embodiment having such a structure, a blood vessel is percutaneously punctured into a blood vessel in the same manner as the conventional indwelling needle, and then the inner tube 11 which is the inner needle is pulled out to form the outer tube 15 which is the cannula. It is connected to a container for blood or a drug solution, an aspirator, or an artificial kidney circuit in a detained state.
【0019】本実施例においても外管15は先端縁17
が先端側周壁面14に接して溝13の内部に隠され、且
つ先端縁部が内側へ湾曲した絞り部16とされてかどば
った段部が存在しない状態で内管11にかぶせられてい
るので、穿刺の際に組織に引掛かることがなく小さい抵
抗で円滑に挿入できるとともに組織を必要以上に傷付け
るということもない。Also in this embodiment, the outer tube 15 has the leading edge 17
Is concealed inside the groove 13 in contact with the peripheral wall surface 14 on the distal end side, and is covered with the inner pipe 11 in the state where there is no stepped portion which is the narrowed portion 16 with the distal end edge curved inward. In addition, the tissue is not caught during the puncture, can be smoothly inserted with a small resistance, and the tissue is not damaged more than necessary.
【0020】また、内管11を抜取る際に一時的に拡げ
られた絞り部16は自身の弾性力で再び内側へ湾曲した
状態に戻るので、先端縁17が血管壁を傷付け或いは剥
離させるということがなく安全である、という点も先の
実施例と同じである。Further, when the inner tube 11 is pulled out, the narrowed portion 16 which has been temporarily expanded returns to the state of being curved inward again due to its own elastic force, so that the tip edge 17 damages or peels off the blood vessel wall. It is also the same as the previous embodiment in that it is safe without any problems.
【0021】尚、溝3,13は断面V形に限らずU形そ
の他外管を嵌入して先端縁を内管外形内に位置させるも
のであれば任意形状とすることができる。The grooves 3 and 13 are not limited to the V-shaped cross section, but may be U-shaped or any other shape as long as the outer tube is fitted and the tip edge is located within the outer shape of the inner tube.
【0022】[0022]
【発明の効果】以上の説明から明かなように、外管の先
端部を内側へ湾曲させて絞り、内管に設けた環状の溝に
嵌入して先端縁を内管外径内に位置させた本発明による
と、外管の先端にかどばった段部が存在しなくなり、体
内に挿入する際に抵抗が小さく円滑に挿入できるととも
に組織を必要以上に大きく傷付けることがなく、容易且
つ安全に取扱えるものである。また、絞り部や環状の溝
はきわめて簡単に成形でき、かどばった段部を存在させ
ないという構造を容易に形成させることができる。As is apparent from the above description, the distal end portion of the outer tube is curved inward and squeezed, and the distal end edge is positioned within the outer diameter of the inner tube by fitting it into the annular groove provided in the inner tube. According to the present invention, there is no stepped portion at the tip of the outer tube, the resistance is small when it is inserted into the body, it can be smoothly inserted, and it does not damage the tissue more than necessary, and it is easy and safe to handle. It is a worm. Further, the narrowed portion and the annular groove can be molded very easily, and the structure in which the rounded step portion does not exist can be easily formed.
【図1】本発明の実施例の縦断面部分図。FIG. 1 is a partial vertical cross-sectional view of an embodiment of the present invention.
【図2】本発明の異なる実施例の縦断面部分図。FIG. 2 is a partial vertical sectional view of a different embodiment of the present invention.
1 11 内管, 3 13 溝, 3b 13b 先
端側周壁面, 5 15 外管, 6 16 絞り部,
7 17 先端縁,1 11 inner tube, 3 13 groove, 3b 13b tip side peripheral wall surface, 5 15 outer tube, 6 16 throttle part,
7 17 tip edge,
Claims (3)
外管に先端部を突出して挿通されており、経皮的に血管
に導入した後にいずれか一方が抜取られる構造の医療用
血管挿入具において、前記内管の先端部に環状の溝が設
けられているとともに、前記外管の先端縁部が内側へ湾
曲して絞られており、前記溝に前記絞り部が嵌入して前
記外管の先端縁が前記内管の外経内に位置させられてい
ることを特徴とする医療用血管挿入具。1. A two-layer structure of an inner tube and an outer tube, wherein the inner tube is inserted into the outer tube with a tip portion protruding, and one of which is withdrawn after being percutaneously introduced into a blood vessel. In the medical blood vessel insertion tool, the inner tube is provided with an annular groove at the distal end thereof, and the distal edge of the outer tube is curved and squeezed inward, and the narrowed portion is provided in the groove. A medical blood vessel insertion tool, wherein the distal end edge of the outer tube is fitted and positioned inside the outer diameter of the inner tube.
するとともにシースを外管とし、血管導入後に拡張管が
抜取られるカテーテルイントロデューサである医療用血
管挿入具。2. The medical blood vessel insertion tool according to claim 1, which is a catheter introducer in which the expansion tube is an inner tube and the sheath is an outer tube, and the expansion tube is removed after introducing the blood vessel.
るとともにカニューレを外管とし、血管導入後に内針が
抜取られる留置針である医療用血管挿入具。3. A medical blood vessel insertion tool, wherein the insertion tool according to claim 1 is an indwelling needle in which the inner needle serves as an inner tube and the cannula serves as an outer tube, and the inner needle is withdrawn after introducing the blood vessel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6065573A JPH07246241A (en) | 1994-03-09 | 1994-03-09 | Blood vessel insertion means for medical treatment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6065573A JPH07246241A (en) | 1994-03-09 | 1994-03-09 | Blood vessel insertion means for medical treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07246241A true JPH07246241A (en) | 1995-09-26 |
Family
ID=13290895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6065573A Pending JPH07246241A (en) | 1994-03-09 | 1994-03-09 | Blood vessel insertion means for medical treatment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07246241A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6120480A (en) * | 1997-10-28 | 2000-09-19 | Medtronic Ave, Inc. | Catheter introducer |
JP2010536446A (en) * | 2007-08-22 | 2010-12-02 | フレゼニウス メディカル ケア ドイチラント ゲー・エム・ベー・ハー | Device and method for monitoring access to a patient |
JP2011502556A (en) * | 2007-07-24 | 2011-01-27 | メデイカル コンポーネンツ,インコーポレーテツド | Catheter tunnel |
CN116492099A (en) * | 2023-06-16 | 2023-07-28 | 昆明市第一人民医院 | Method for establishing rat tree shrew xenogeneic in-situ liver transplantation model |
-
1994
- 1994-03-09 JP JP6065573A patent/JPH07246241A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6120480A (en) * | 1997-10-28 | 2000-09-19 | Medtronic Ave, Inc. | Catheter introducer |
JP2011502556A (en) * | 2007-07-24 | 2011-01-27 | メデイカル コンポーネンツ,インコーポレーテツド | Catheter tunnel |
JP2010536446A (en) * | 2007-08-22 | 2010-12-02 | フレゼニウス メディカル ケア ドイチラント ゲー・エム・ベー・ハー | Device and method for monitoring access to a patient |
CN116492099A (en) * | 2023-06-16 | 2023-07-28 | 昆明市第一人民医院 | Method for establishing rat tree shrew xenogeneic in-situ liver transplantation model |
CN116492099B (en) * | 2023-06-16 | 2023-09-15 | 昆明市第一人民医院 | Bile duct puncture outfit for rat tree shrew xenogeneic in-situ liver transplantation |
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