JPH042048B2 - - Google Patents
Info
- Publication number
- JPH042048B2 JPH042048B2 JP63126966A JP12696688A JPH042048B2 JP H042048 B2 JPH042048 B2 JP H042048B2 JP 63126966 A JP63126966 A JP 63126966A JP 12696688 A JP12696688 A JP 12696688A JP H042048 B2 JPH042048 B2 JP H042048B2
- Authority
- JP
- Japan
- Prior art keywords
- catheter
- balloons
- inflation
- blood vessel
- fluid supply
- 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.)
- Expired - Lifetime
Links
- 210000004204 blood vessel Anatomy 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002792 vascular Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 208000007536 Thrombosis Diseases 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000017531 blood circulation Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000001361 intraarterial administration Methods 0.000 description 2
- KKJUPNGICOCCDW-UHFFFAOYSA-N 7-N,N-Dimethylamino-1,2,3,4,5-pentathiocyclooctane Chemical compound CN(C)C1CSSSSSC1 KKJUPNGICOCCDW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007887 coronary angioplasty Methods 0.000 description 1
- 210000004351 coronary vessel Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000002504 physiological saline solution Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Landscapes
- Radiation-Therapy Devices (AREA)
- Endoscopes (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Laser Surgery Devices (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、血管内視或は動脈内治療等のために
血管に挿入されるカテーテル型血管内視鏡に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a catheter-type angioscope inserted into a blood vessel for endovascular viewing or intra-arterial therapy.
内視鏡の視野角は一般的に小さいために、消化
管等の湾曲部分ではその先端部分を対応して湾曲
させて目的部位を観察する必要がある。このた
め、第４図に示すようなワイヤー２２を両側又は
四方に取付けられた連節管２３から成る可とう部
をフアイバスコープバンドルに並設し、このワイ
ヤ２２を手元の操作ダイヤル２４の回転で引いた
り緩めたりして先端部を湾曲させ得る内視鏡が周
知である。
Since the viewing angle of an endoscope is generally small, in curved areas such as the gastrointestinal tract, it is necessary to curve the distal end of the endoscope to observe the target area. For this purpose, a flexible part consisting of an articulated tube 23 to which a wire 22 is attached on both sides or all four sides as shown in FIG. Endoscopes that can be pulled or loosened to curve their distal ends are well known.
一方、血管内視鏡については、特に冠状動脈を
観察する場合、その外径は、内視画像伝送用イメ
ージフアイバ、先端照明用ライトガイドフアイバ
及び血管内視の確保のための送水・吸水チヤネル
を組み込んだ状態で1.5mm以下にする必要がある。
したがつて、直径が９mm〜15mmになる前述の機構
を採用するのは困難である。また、例えば血管内
の血栓を除去するためにレーザ光を用いる場合
に、血管壁に対して斜めに位置調整を行つて光照
射を行うと、血管を穿孔する危険性が高くなる。
On the other hand, for angioscopes, especially when observing coronary arteries, the outer diameter is determined by the image fiber for endoscopic image transmission, the light guide fiber for distal illumination, and the water supply/water absorption channel for ensuring endovascular visualization. It must be 1.5mm or less when assembled.
Therefore, it is difficult to employ the above-described mechanism having a diameter of 9 mm to 15 mm. Further, when using a laser beam to remove a blood clot in a blood vessel, for example, if the position is adjusted obliquely to the blood vessel wall and the light is irradiated, the risk of perforating the blood vessel increases.
よつて、本発明は、血管壁に沿つた状態でその
断面における位置を外部操作により、嵩ばらない
構造で調整可能なカテーテル型血管内視鏡を提供
することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a catheter-type angioscope with a compact structure whose cross-sectional position along a blood vessel wall can be adjusted by external manipulation.
本発明は、この目的を達成するために、血管内
視用カテーテル１の先端部周囲にバルーン５1〜
５3を少なくとも２個取付けて、それぞれに連通
する流体供給路６1〜６3，７1〜７3をカテーテル
１に沿つて形成すると共に、血管の断面位置にお
けるカテーテル位置を外部操作により設定して対
応する位置指示信号を出力するカテーテル位置設
定手段１０と、位置指示信号に応答して各バルー
ン５1〜５3を所定の大きさに膨張させるように、
それぞれに個有の膨張量指示信号を発生する膨張
量指示信号発生手段１１と、各膨張量指示信号に
応じて流体供給路６1〜６3，７1〜７3の後端から
それぞれの各バルーン５1〜５3に対して流体の圧
入又は排出を互に独立に行う流体供給手段と、各
バルーン５1〜５3の膨張量を表示する膨張量指示
手段１７とを備えている。
In order to achieve this object, the present invention provides balloons 5 1 to 5 around the distal end of the vascular endoscopic catheter 1.
At least two fluid supply channels 6 1 to 6 3 and 7 1 to 7 3 are formed along the catheter 1 by attaching at least two fluid supply channels 6 1 to 6 3 and 7 1 to 7 3 communicating with each other , and the catheter position in the cross-sectional position of the blood vessel is set by external operation. catheter positioning means 10 for outputting a corresponding position indication signal; and for inflating each balloon 5 1 to 5 3 to a predetermined size in response to the position indication signal.
Expansion amount instruction signal generation means 11 generates an expansion amount instruction signal unique to each, and each of the fluid supply paths 61 to 63 , 71 to 73 is The balloons 5 1 to 5 3 are equipped with fluid supply means for pressurizing or discharging fluid from each other independently, and an inflation amount indicating means 17 for displaying the amount of inflation of each balloon 5 1 to 5 3 .
カテーテル１を血管に挿入した状態で、その内
部を観察しつつカテーテル位置設定手段１０を操
作すると、その位置指示信号に対応して膨張量指
示信号発生手段１１はそれぞれのバルーン５1〜
５3に対する膨張量指示信号を発生する。これに
より、流体供給手段１２1〜１２3，１３1〜３3，
１４1〜１４3，１５1〜１５3，１６は、それぞれ
のバルーン５1〜５3への流体の供給量の制御を行
い所定の大きさに設定する。したがつて、膨張量
指示手段１７で各バルーン５1〜５3の膨張量をモ
ニタしつつカテーテル１はバルーン５1〜５3の相
対的な大きさの関係に対応する血管断面位置に調
整される。
When the catheter position setting means 10 is operated while observing the inside of the catheter 1 inserted into the blood vessel, the inflation amount instruction signal generation means 11 moves the respective balloons 5 1 to 5 in response to the position instruction signal.
5 Generates an expansion amount instruction signal for 3 . As a result, the fluid supply means 12 1 to 12 3 , 13 1 to 3 3 ,
14 1 to 14 3 , 15 1 to 15 3 , and 16 control the amount of fluid supplied to each balloon 5 1 to 5 3 and set it to a predetermined size. Therefore, the catheter 1 is adjusted to the blood vessel cross-sectional position corresponding to the relative size relationship of the balloons 5 1 to 5 3 while monitoring the inflation amount of each balloon 5 1 to 5 3 using the inflation amount indicating means 17. Ru.
バルーン５1〜５3が２個の場合、その膨張・収
縮により直線方向に位置調整できるが、カテーテ
ル１の回転位置の調整により同様に二次元血管断
面での調整が可能である。 When there are two balloons 5 1 to 5 3 , the position can be adjusted in the linear direction by inflating and deflating the balloons, but adjustment in the two-dimensional blood vessel cross section is also possible by adjusting the rotational position of the catheter 1 .
第１図及び第２図は、本発明の一実施例による
カテーテル型血管内視鏡を示す。
1 and 2 show a catheter-type angioscope according to an embodiment of the present invention.
第１図において、カテーテル１は、通常のよう
に1.5mm程度の外径であり、観察及び照明用の光
フアイバ群２1、レーザ光線導光用フアイバ２2及
び送水・吸水パイプ２3を備えると共に、本発明
により先端部周囲に120度間隔で互に隙間を置い
てバルーン５1〜５3を備え、それぞれに連通する
内径0.1mm程度の細管６1〜６3が形成されている。
そして、カテーテル１の後方の基部１ａにおいて
細管６1〜６3にそれぞれに連通するチユーブ７1
〜７3がカテーテル１から分離して導出されてい
る。 In FIG. 1, a catheter 1 has an outer diameter of about 1.5 mm as usual, and is equipped with a group of optical fibers 2 1 for observation and illumination, a fiber 2 2 for guiding a laser beam, and a water supply/water suction pipe 2 3 . In addition, according to the present invention, balloons 5 1 to 5 3 are provided at intervals of 120 degrees around the tip, and thin tubes 6 1 to 6 3 having an inner diameter of about 0.1 mm are formed in communication with each balloon.
At the rear base 1a of the catheter 1, tubes 7 1 are connected to the thin tubes 6 1 to 6 3 respectively.
~7 3 are led out separately from the catheter 1.
これらのチユーブは、第２図に示すように、し
や断位置、大気開放位置及び加圧されたHeガス
を貯蔵するHeタンク１６のいずれかに切換わる
所属の３方向弁１２1〜１２3にそれぞれ接続して
いる。 As shown in FIG. 2, these tubes have their own three-way valves 12 1 to 12 3 that can be switched to either the shearing position, the atmosphere open position, or the He tank 16 storing pressurized He gas. are connected to each.
同図において、１０はカテーテル位置設定手段
としてのジヨイステイツクであり、Ｘ−Ｙ軸面の
原点位置において倒した方向及びその量に対応す
る座標信号を出力する。 In the figure, reference numeral 10 denotes a joystick as a catheter position setting means, which outputs a coordinate signal corresponding to the direction and amount of tilting at the origin position of the X-Y axis plane.
１１は膨張量指示回路であり、入力する±の
Ｘ、Ｙ座標信号をこれにより規定される血管断面
位置に対応してバルーン５1〜５3の膨張量を指示
する膨張量指示信号に変換する。この膨張量指示
回路は、１個のＸ、Ｙ座標信号を３個の膨張量指
示信号に換算するCPUを利用して構成できる。
さらに、外部操作により発生されるバルーン制御
オン信号に応答して作動を開始し、その消滅時に
はいずれのバルーン５1〜５3も膨張させない膨張
量指示信号を発生する。 Reference numeral 11 denotes an inflation amount instruction circuit, which converts input ±X and Y coordinate signals into an inflation amount instruction signal that indicates the amount of inflation of the balloons 5 1 to 5 3 in accordance with the blood vessel cross-sectional position defined thereby. . This expansion amount instruction circuit can be configured using a CPU that converts one X, Y coordinate signal into three expansion amount instruction signals.
Furthermore, it starts operating in response to a balloon control ON signal generated by an external operation, and when it disappears, generates an inflation amount instruction signal that does not inflate any of the balloons 5 1 to 5 3 .
１２1〜１２3は所属のチユーブ７1〜７3内のHe
圧力を検知する圧力センサであり、それぞれに
Ａ／Ｄコンバータ１３1〜１３3が後続している。 12 1 to 12 3 are He in the tubes 7 1 to 7 3 to which they belong.
These are pressure sensors that detect pressure, and are each followed by A/D converters 13 1 to 13 3 .
１４1〜１４3は弁制御回路であり、それぞれ膨
張量指示信号と比較してＡ／Ｄコンバータ１３1
〜１３3の所属の出力値が下廻ると所属の３方向
弁１５1〜１５3をHeタンク１６へ切換え、上廻
ると大気へ排気させ、所定の誤差範囲内で一致す
るとしや断してチユーブ７1〜７3内のHe圧を保
持させる。また、これらの弁制御回路は、Ａ／Ｄ
コンバータ１３1〜１３3の出力値が限界値を上廻
つたり或は急減する異常発生時には３方向弁１５
１〜１５3をしや断する。 14 1 to 14 3 are valve control circuits, each of which compares the expansion amount instruction signal and controls the A/D converter 13 1
When the output value of ~ 133 falls below, the associated three-way valve 151 ~ 153 is switched to the He tank 16, and when it rises above, it is exhausted to the atmosphere, and when it matches within a predetermined error range, it is cut off. The He pressure inside the tubes 71 to 73 is maintained. In addition, these valve control circuits are A/D
When an abnormality occurs in which the output value of the converters 13 1 to 13 3 exceeds the limit value or suddenly decreases, the three-way valve 15
1 to 15 3 are cut off.
１７はブラウン管であり、バルーン５1〜５3内
の圧力、即ちＡ／Ｄコンバータ１３1〜１３3の出
力値に対応するレベルをその配列に対応して120
度間隔の放射方向の線１７1〜１７3で表示すると
共に、前述の異常発生時にその旨の表示も行う。 Reference numeral 17 denotes a cathode ray tube, which controls the pressure inside the balloons 5 1 to 5 3 , that is, the level corresponding to the output value of the A/D converters 13 1 to 13 3 in accordance with its arrangement.
In addition to displaying lines 17 1 to 17 3 in the radial direction at degree intervals, a message to that effect is also displayed when the above-mentioned abnormality occurs.
このように構成されたカテーテル型血管内視鏡
の動作は次の通りである。 The operation of the catheter-type angioscope configured as described above is as follows.
カテーテル１を動脈に挿入し、周知のようにパ
イプ２3を通して加温した生理食塩水の注入を行
い、フアイバ部２1を通して照明し、かつ血管内
を観察する。次いで、バルーン制御オン信号を発
生させ、ジヨイステイツク１０を血管断面の所望
位置へ相応して倒すと、対応した座標位置信号が
膨張量指示回路１１へ供給され、膨張量指示信号
に変換される。これにより、弁制御回路１４1〜
１４3はそれぞれ所属の膨張量指示信号と所属の
検知圧力値とを比較して、その差に応じて所属の
３方向弁１５1〜１５3を切換及びしや断制御する
ことにより、所属のパイプ７1〜７3へHeガスを
圧入するか又は排気・減圧して所定の膨張量に設
定する。これにより、カテーテル１の先端部は血
管内の壁面にほぼ平行状態で断面位置を移動す
る。バルーン５1〜５3間には互に隙間があるため
に、血流或は水流を阻害しない。そして、所望の
設定位置で、必要によりレーザ光導光フアイバ２
２を通してレーザ光照射により治療を行う。 The catheter 1 is inserted into the artery, heated physiological saline is injected through the pipe 23 in a well-known manner, and the inside of the blood vessel is observed by illuminating through the fiber section 21 . Then, when the balloon control ON signal is generated and the joystick 10 is tilted to a desired position on the blood vessel cross section, the corresponding coordinate position signal is supplied to the inflation amount indicating circuit 11 and converted into an inflation amount indicating signal. This allows the valve control circuit 14 1 to
14 3 compares the associated expansion amount instruction signal with the associated detected pressure value, and controls the associated three-way valves 15 1 to 15 3 to switch and cut off according to the difference. He gas is pressurized into the pipes 7 1 to 7 3 or evacuated and depressurized to set a predetermined expansion amount. As a result, the distal end of the catheter 1 moves in cross-sectional position substantially parallel to the wall surface within the blood vessel. Since there is a gap between the balloons 51 to 53 , blood flow or water flow is not obstructed. Then, at the desired setting position, the laser beam guide fiber 2 is inserted as necessary.
Treatment is performed by laser light irradiation through step 2 .
終了後は、バルーン制御オン信号を消滅させる
ことにより、バルーン５1〜５3を全て収縮させて
カテーテル１を抜く。 After completion, the balloon control ON signal is extinguished to deflate all the balloons 5 1 to 5 3 and remove the catheter 1.
尚、前述の実施例において、流体としては場合
によつては液体を利用することもでき、流体供給
手段としてはシリンダのピストンを膨張指示信号
に対応して位置制御することにより実施すること
もできる。また、位置設定手段としては極座標信
号を出力したり操作構造も別のものにすることも
できる。バルーンは４個以上にしてもよく、さら
にその後方に第３図に示すように同様に膨張・収
縮させられるリング状のバルーン２５を付設し
て、治療時に膨張させて血流をしや断させること
も考えられる。 In the above embodiments, a liquid may be used as the fluid depending on the case, and the fluid supply means may be implemented by controlling the position of the piston of the cylinder in response to the expansion instruction signal. . Further, the position setting means may output a polar coordinate signal, or may have a different operation structure. The number of balloons may be four or more, and a ring-shaped balloon 25 that can be inflated and deflated in the same way is attached to the rear as shown in Fig. 3, and is inflated during treatment to cut off the blood flow. It is also possible.
本発明は、カテーテルにレーザ照射用フアイバ
を備えなかつたり、或は代りに血栓治療用のホツ
トチツプ法、カツタ法による治療具を内蔵する場
合にも当然適用される。 The present invention is of course applicable to cases where the catheter is not equipped with a laser irradiation fiber or, instead, has a built-in treatment device using a hot-chip method or a cutter method for thrombus treatment.
以上、本発明によれば、カテーテル外径自体は
ほとんど変更しないで済むカテーテル型血管内視
鏡が実現され、簡単な手動操作により各バルーン
の膨張量を確認しつつ血管の中心に内視鏡を置く
ことが可能になり、血管壁の状態を見易くする。
また、血管内の任意の場所に内視鏡を固定でき、
容易に血管内壁の目的部位を観察でき、その任意
の場所の治療も可能になる。特に、レーザ照射、
ホツトチツプ法、カツタ法による動脈内血栓の治
療に用いる場合、カテーテルは血管壁に平行に移
動する冠めに穿孔の危険性が少なくなる。PTCA
（経皮的冠状動脈形成術）を行うことも可能であ
る。
As described above, according to the present invention, a catheter-type angioscope that requires almost no change in the outer diameter of the catheter itself is realized, and the endoscope is placed at the center of the blood vessel while checking the amount of inflation of each balloon through simple manual operations. This makes it easier to see the condition of the blood vessel wall.
In addition, the endoscope can be fixed anywhere within the blood vessel,
The target site on the inner wall of the blood vessel can be easily observed, and treatment can be performed at any location. In particular, laser irradiation,
When used to treat intra-arterial thrombi using the hot-chip method or the stub method, the risk of perforation is reduced because the catheter moves parallel to the blood vessel wall. PTCA
It is also possible to perform percutaneous coronary angioplasty.
第１図は本発明の一実施例によるカテーテル型
血管内視鏡のカテーテル部分の断面図及びその先
端部の正面図、第２図はこのカテーテル部分に後
続する主要部の構成を示す図、第３図は本発明の
他の実施例によるカテーテル部分の先端部の斜視
図及び第４図は従来の位置調整可能な内視鏡の要
部断面図である。
１……カテーテル、１０……ジヨイステイツ
ク、１２1〜１２3……３方向弁、１６……Heタ
ンク。
FIG. 1 is a cross-sectional view of a catheter portion of a catheter-type angioscope according to an embodiment of the present invention and a front view of its distal end. FIG. FIG. 3 is a perspective view of the distal end of a catheter portion according to another embodiment of the present invention, and FIG. 4 is a sectional view of a main part of a conventional position-adjustable endoscope. 1... Catheter, 10... Joystick, 12 1 to 12 3 ... Three-way valve, 16... He tank.
Claims (1)
パイプ及び血管治療具を少なくとも組み込まれた
カテーテル型血管内視鏡において、 カテーテルの先端部周囲にバルーンを少なくと
も２個取付け、それぞれに連通する流体供給路を
カテーテルに沿つて形成すると共に、 血管の断面位置における前記カテーテル位置を
外部操作により設定して対応する位置指示信号を
出力するカテーテル位置設定手段と、 前記位置指示信号に応答して前記各バルーンを
所定の大きさに膨張させるように、それぞれに個
有の膨張量指示信号を発生する膨張量指示信号発
生手段と、 前記各膨張量指示信号に応じて前記流体供給路
の後端からそれぞれの前記各バルーンに対して前
記流体の圧入又は排出を互に独立に行う流体供給
手段と、 前記各バルーンの膨張量を表示する膨張量指示
手段とを備えたことを特徴とするカテーテル型血
管内視鏡。[Scope of Claims] 1. A catheter-type angioscope in which at least an observation and illumination fiber, a water supply pipe, and a vascular treatment device are incorporated into a catheter, wherein at least two balloons are attached around the distal end of the catheter and communicate with each other. a catheter positioning means for forming a fluid supply path along the catheter, and for setting the catheter position at a cross-sectional position of the blood vessel by an external operation and outputting a corresponding position indication signal; an inflation amount instruction signal generating means for generating a unique inflation amount instruction signal so as to inflate each balloon to a predetermined size; and a rear end of the fluid supply path in response to each of the inflation amount instruction signals. A catheter type, comprising: a fluid supply means for independently pressurizing or discharging the fluid into each of the balloons; and an inflation amount indicating means for displaying the amount of inflation of each of the balloons. Angioscopy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63126966A JPH01297036A (en) | 1988-05-26 | 1988-05-26 | Catheter type blood vessel endoscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63126966A JPH01297036A (en) | 1988-05-26 | 1988-05-26 | Catheter type blood vessel endoscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01297036A JPH01297036A (en) | 1989-11-30 |
| JPH042048B2 true JPH042048B2 (en) | 1992-01-16 |
Family
ID=14948303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63126966A Granted JPH01297036A (en) | 1988-05-26 | 1988-05-26 | Catheter type blood vessel endoscope |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01297036A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02255120A (en) * | 1989-03-30 | 1990-10-15 | Fujikura Ltd | Catheter for blood vessel endoscope |
| JP3834820B2 (en) | 2004-11-04 | 2006-10-18 | フジノン株式会社 | Balloon control device for endoscope apparatus |
| JP3859081B2 (en) | 2004-11-04 | 2006-12-20 | フジノン株式会社 | Balloon control device for endoscope apparatus |
| JP4675149B2 (en) * | 2005-05-13 | 2011-04-20 | 独立行政法人理化学研究所 | Spectroscopic probe for blood vessel diagnosis |
| JP4708937B2 (en) * | 2005-09-15 | 2011-06-22 | Ｈｏｙａ株式会社 | OCT observation instrument, fixing instrument, and OCT system |
| JP4517252B2 (en) * | 2007-06-01 | 2010-08-04 | 富士フイルム株式会社 | Endoscope device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57810A (en) * | 1980-06-04 | 1982-01-05 | Hitachi Ltd | No-break switching disconnecting switch |
-
1988
- 1988-05-26 JP JP63126966A patent/JPH01297036A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57810A (en) * | 1980-06-04 | 1982-01-05 | Hitachi Ltd | No-break switching disconnecting switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01297036A (en) | 1989-11-30 |
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