JPH0910216A - Ultrasonic catheter - Google Patents

Ultrasonic catheter

Info

Publication number
JPH0910216A
JPH0910216A JP16561995A JP16561995A JPH0910216A JP H0910216 A JPH0910216 A JP H0910216A JP 16561995 A JP16561995 A JP 16561995A JP 16561995 A JP16561995 A JP 16561995A JP H0910216 A JPH0910216 A JP H0910216A
Authority
JP
Japan
Prior art keywords
housing
catheter
ultrasonic
transducer
ultrasonic catheter
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
Application number
JP16561995A
Other languages
Japanese (ja)
Inventor
Hiroyuki Yagami
弘之 矢上
Hiroshi Katsumata
洋 勝又
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Terumo Corp
Original Assignee
Terumo Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Terumo Corp filed Critical Terumo Corp
Priority to JP16561995A priority Critical patent/JPH0910216A/en
Priority to US08/672,119 priority patent/US5738100A/en
Priority to EP96401444A priority patent/EP0754430B1/en
Priority to DE69633157T priority patent/DE69633157T2/en
Publication of JPH0910216A publication Critical patent/JPH0910216A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To enlarge the size of a vibrator so as to make the reaching depth of ultrasonic waves deep and narrow extent in an azimuth direction in the ultrasonic catheter of a narrow diameter by constituting the housing of the ultrasonic catheter by a nonconducting material. CONSTITUTION: The housing 27 provided with a transducer 11 is incorporated on the tip side of the exterior shaft 2 of this catheter and the housing 27 fixes the transducer 11 to the gutter-like part 18 of a cylindrical hollow pipe. Further, the housing 27 is fixed to the tip of a coil-shaped driving shaft 6 and the tip side of the housing 27 is connected to an elastic member 19. The signal line 7 of pair stranded wires is incorporated in the driving shaft 6, the catheter tip side of the signal line 7 is connected to the vibrator formed in the transducer 11 and an at-hand side is connected to the terminal of an at-hand operation part. In this case, the housing 27 is composed of the nonconducting material, preferably of a ceramic material such as alumina or zirconia.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、血管及び脈管等の体腔
内に挿入して用いられる超音波カテーテルに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic catheter used by inserting it into a body cavity such as a blood vessel or a blood vessel.

【0002】[0002]

【従来の技術】従来から心臓の冠状動脈や他の細血管、
或いは胆管等の脈管に挿入して、管腔断面像の表示や血
流測定等を行う超音波カテーテルが知られている。この
超音波カテーテルは例えば、図1或いは図2に示すよう
に体腔内に挿入される中空のカテーテルシャフト2の先
端部に超音波振動子3と、振動子3を直接或いは超音波
反射板4を回転させる駆動力を伝達する駆動伝達シャフ
ト6と、振動子3と外部電気回路5を接続する信号線7
を内蔵し、駆動シャフトを外部駆動源8により機械的に
駆動させることに依って超音波を走査する超音波カテー
テルが知られている。
BACKGROUND OF THE INVENTION Traditionally, the coronary arteries of the heart and other small blood vessels,
Alternatively, there is known an ultrasonic catheter which is inserted into a blood vessel such as a bile duct to display a cross-sectional image of a lumen and measure blood flow. In this ultrasonic catheter, for example, as shown in FIG. 1 or 2, the ultrasonic transducer 3 and the transducer 3 directly or with the ultrasonic reflection plate 4 are attached to the distal end of a hollow catheter shaft 2 inserted into a body cavity. A drive transmission shaft 6 that transmits a driving force to rotate, and a signal line 7 that connects the vibrator 3 and the external electric circuit 5.
There is known an ultrasonic catheter that incorporates a laser and scans an ultrasonic wave by mechanically driving a drive shaft by an external drive source 8.

【0003】従来の超音波カテーテルでは、ハウジング
は外装シャフトとの摺動性を良くするために、外形を円
筒形にしたものが多い。(特開平5−212036号、
特開平5−92003号)また、駆動シャフト6はステ
ンレス鋼(SUS304,SUS316等)等の金属性
コイルが用いられ、ハウジングと駆動シャフトとの接続
をロウ付けや溶接に依っているため、ハウジングには駆
動シャフトと同様にステンレス鋼(SUS304,SU
S316等)等の金属材料が使用されてきた。しかし、
振動子の電極間での短絡を防ぐにはハウジングに固定さ
れる振動子の少なくとも一方の電極はハウジングに接触
しないようにしなければならないことになる。そのた
め、振動子を絶縁材料からなる枠体に収納しこれをハウ
ジングに固定する等の方法が取られてきた。これらの方
法によれば、振動子はその絶縁体の厚さによって外径が
小さく制限されてしまう。ところで、振動子のサイズ
は、超音波の到達深度、方位方向の超音波の広がりが極
めて重要であるため、超音波カテーテルの細径化特に外
径1mm以下にする場合では、超音波の方位方向の広がり
を小さくし且つ到達深度を深くするためには、振動子の
サイズはできるだけ大きい方が望ましい。
In many conventional ultrasonic catheters, the housing has a cylindrical outer shape in order to improve slidability with respect to the outer shaft. (JP-A-5-212036,
Further, the drive shaft 6 is made of a metallic coil made of stainless steel (SUS304, SUS316, etc.), and the housing is connected to the drive shaft by brazing or welding. Is made of stainless steel (SUS304, SU
Metallic materials such as S316) have been used. But,
In order to prevent a short circuit between the electrodes of the vibrator, at least one electrode of the vibrator fixed to the housing must be kept out of contact with the housing. Therefore, methods such as housing the vibrator in a frame made of an insulating material and fixing the vibrator to the housing have been taken. According to these methods, the outer diameter of the vibrator is limited to a small value by the thickness of the insulator. By the way, as for the size of the transducer, the arrival depth of ultrasonic waves and the spread of ultrasonic waves in the azimuth direction are extremely important. The size of the oscillator is preferably as large as possible in order to reduce the spread and the reach depth.

【0004】[0004]

【発明が解決しようとする課題】本発明では、特に細径
な超音波カテーテルにおいて、超音波の到達深度を深
く、及び方位方向の広がりを小さくするために、従来に
比して振動子のサイズを大きくできる構成を提供するこ
とを目的とする。
SUMMARY OF THE INVENTION According to the present invention, the size of the transducer is smaller than that of the conventional one in order to increase the depth of arrival of ultrasonic waves and to reduce the spread in the azimuth direction, especially in an ultrasonic catheter having a small diameter. It is an object of the present invention to provide a configuration capable of increasing

【0005】[0005]

【課題を解決するための手段】このような目的は体腔内
に挿入して用いられるカテーテルに手元側から先端側ま
で機械的駆動力を伝達する駆動シャフトを内蔵し、該カ
テーテルの先端側に超音波振動子及びまたは超音波反射
板を備えたハウジングを該駆動シャフトに接続し、該駆
動シャフトを外部駆動源により回転或いはまたは並進さ
せる超音波カテーテルであって、該ハウジングを非導電
性材料で構成したことを特徴とする超音波カテーテルに
よって達成される。
The purpose is to incorporate a drive shaft for transmitting a mechanical drive force from a proximal side to a distal side into a catheter to be inserted into a body cavity and use it at the distal side of the catheter. An ultrasonic catheter in which a housing provided with an ultrasonic transducer and / or an ultrasonic reflection plate is connected to the drive shaft, and the drive shaft is rotated or translated by an external drive source, and the housing is made of a non-conductive material. It is achieved by an ultrasonic catheter characterized in that

【0006】また、該ハウジングをアルミナ、ジルコニ
ア等のセラミック材料で構成することが好ましい。
The housing is preferably made of a ceramic material such as alumina or zirconia.

【0007】また、該ハウジングを円筒形とし、該円筒
形のハウジングの一部分を径方向に樋状に加工し、該振
動子を該ハウジングの樋状部分に接触するようにして構
成することが好ましい。
Further, it is preferable that the housing is formed in a cylindrical shape, a part of the cylindrical housing is processed into a gutter shape in the radial direction, and the vibrator is brought into contact with the gutter-shaped part of the housing. .

【0008】[0008]

【実施例】図3、図4に本発明の超音波カテーテル10
を示す。図3は本発明の超音波カテーテルの一部軸方向
断面及びシステム構成図である。図4は本発明の超音波
カテーテルの手元操作部及び外部ユニットの一部軸方向
断面図である。
EXAMPLE An ultrasonic catheter 10 of the present invention is shown in FIGS.
Is shown. FIG. 3 is a partial axial cross-sectional view and system configuration diagram of the ultrasonic catheter of the present invention. FIG. 4 is a partial axial cross-sectional view of the hand operation part and the external unit of the ultrasonic catheter of the present invention.

【0009】次に本発明の超音波カテーテルの構造を説
明する。カテーテルの外装シャフト2の先端側に超音波
を送受するためのトランスジューサ11を備えたハウジ
ング27が内蔵されている。ハウジング27は、円筒形
の中空パイプの一部18が樋状であり、この樋状部分1
8にトランスジューサ11が固定されている。更にハウ
ジング27はコイル状の駆動シャフト6の先端に固定さ
れ、ハウジング27の先端側は弾性部材19が接続され
ている。外装シャフトの先端側には造影性を有する金属
片14が固定されている。駆動シャフト6は対より線の
信号線7を内蔵し、信号線7のカテーテル先端側は、ト
ランスジューサ11に形成された振動子に接続され、手
元側は手元操作部20の端子21、22に接続されてい
る。手元操作部20は外部ユニット13の係止部25と
脱着可能に接続されている。手元操作部20内の端子2
1、22は、スリップリング等の回転摺動端子26を介
して送受信回路5と電気的接続を行うと共に、モーター
16からの駆動力を駆動シャフト6に伝達するように、
外部駆動源8の端子23、24と脱着可能に接続され
る。外部ユニット13には、送受信回路5とモーター1
6を含む駆動源5を備えている。外部ユニット13は、
更に信号処理回路と画像表示装置を有するコンソール1
に電気的に接続されている。
Next, the structure of the ultrasonic catheter of the present invention will be described. A housing 27 having a transducer 11 for transmitting and receiving ultrasonic waves is built in at the distal end side of the exterior shaft 2 of the catheter. In the housing 27, a part 18 of a hollow cylindrical pipe is gutter-shaped.
A transducer 11 is fixed at 8. Further, the housing 27 is fixed to the tip of the coil-shaped drive shaft 6, and the elastic member 19 is connected to the tip of the housing 27. A metal piece 14 having a contrast property is fixed to the tip end side of the exterior shaft. The drive shaft 6 incorporates a pair of twisted signal lines 7, the catheter tip side of the signal line 7 is connected to a transducer formed on a transducer 11, and the hand side is connected to terminals 21 and 22 of a hand operation unit 20. Has been done. The hand operation part 20 is detachably connected to the locking part 25 of the external unit 13. Terminal 2 in the hand operation part 20
1, 22 are electrically connected to the transmission / reception circuit 5 via a rotary sliding terminal 26 such as a slip ring, and transmit the driving force from the motor 16 to the drive shaft 6.
It is detachably connected to the terminals 23 and 24 of the external drive source 8. The external unit 13 includes a transmission / reception circuit 5 and a motor 1.
A drive source 5 including 6 is provided. The external unit 13 is
Further, a console 1 having a signal processing circuit and an image display device
Is electrically connected to

【0010】次に本発明の超音波カテーテル10のトラ
ンスジューサ11の構造について述べる。図5(a)、
図5(b)は本発明の超音波カテーテル10のハウジン
グ27に備えられるトランスジューサ11の断面構造を
示している。振動子3は、矩形状のPZT等の圧電体3
1の両面に電極32を蒸着、印刷等により形成されてい
る。ここで圧電体31の形状は円形であってもよい。振
動子3の背面側に超音波吸収、減衰させるエポキシ、ウ
レタン、アクリル系等の樹脂或いは樹脂に金属や無機粉
末を混合した背面材33を設ける。ここで背面材33
は、図5(a)に示すように背面側に厚みの差Dがλ/
4(λは送信周波数における背面材中の波長)となる凹
凸34を設けることに依って背面材33の背面からの反
射波を干渉により打ち消すようにした背面材、または図
5(b)に示すように、低音響インピーダンス層36
(Z=8×106Kg/m2s 以下)と高インピーダンス層3
7(Z=20×106kg/m2s 以上)を交互積層させるこ
とに依って背面材33の背面からの反射波の影響を減じ
た背面材であってもよい。
Next, the structure of the transducer 11 of the ultrasonic catheter 10 of the present invention will be described. FIG. 5 (a),
FIG. 5B shows a sectional structure of the transducer 11 provided in the housing 27 of the ultrasonic catheter 10 of the present invention. The vibrator 3 is a rectangular piezoelectric body 3 such as PZT.
The electrodes 32 are formed on both surfaces of the electrode 1 by vapor deposition, printing or the like. Here, the shape of the piezoelectric body 31 may be circular. On the back surface side of the vibrator 3, a resin material such as epoxy, urethane, acrylic resin or the like for absorbing and attenuating ultrasonic waves, or a back material 33 in which metal or inorganic powder is mixed with resin is provided. Back material 33 here
As shown in FIG. 5A, the thickness difference D is λ /
4 (where λ is the wavelength in the backing material at the transmission frequency) is provided so that the reflected wave from the back surface of the backing material 33 is canceled by interference, or the backing material is shown in FIG. 5B. So that the low acoustic impedance layer 36
(Z = 8 × 10 6 Kg / m 2 s or less) and high impedance layer 3
The backing material may be a backing material in which the influence of reflected waves from the back surface of the backing material 33 is reduced by alternately stacking 7 (Z = 20 × 10 6 kg / m 2 s or more).

【0011】振動子3の音響放射面には、いわゆる音響
整合層35を厚さがλ/4(λは送信周波数における整
合層中の波長)となるように形成されている。本例では
1層の場合のみを示したが、2層以上であってもよい。
A so-called acoustic matching layer 35 is formed on the acoustic radiation surface of the vibrator 3 so as to have a thickness of λ / 4 (λ is the wavelength in the matching layer at the transmission frequency). Although only one layer is shown in this example, two or more layers may be provided.

【0012】図6、図7、図8は本発明の超音波カテー
テルの更に詳細な構成を示す図であり、図6は先端構成
図の一部軸方向断面図を示し、図7は先端部分上面図、
図8は、図6のA−A断面図を示している。ハウジング
27は、外径が駆動シャフト6とほぼ等しいパイプ形状
であり、トランスジューサ11の固定部18が内側に樋
状に除かれている。材質は非導電性材料であり、アルミ
ナ、ジルコニア等のセラミック材料が好ましい。ハウジ
ング27の作製には、充分に微量化した原料を押し出し
成形によりパイプ状に成形し、これを加熱焼結してパイ
プ状にする。このパイプをダイシングソー、ワイヤーソ
ー等の研磨加工法で径方向に溝を入れ、トランスジュー
サ11を固定するための樋状部分を形成する。この樋状
部分18にトランスジューサ11をエポキシ系、セラミ
ック系、シアノアクリレート系等の接着剤により固定す
る。
FIGS. 6, 7 and 8 are views showing a more detailed structure of the ultrasonic catheter of the present invention. FIG. 6 shows a partial axial sectional view of the tip configuration diagram, and FIG. 7 shows the tip portion. Top view,
FIG. 8 shows a sectional view taken along line AA of FIG. The housing 27 has a pipe shape having an outer diameter substantially equal to that of the drive shaft 6, and the fixing portion 18 of the transducer 11 is removed inward in a gutter shape. The material is a non-conductive material, and a ceramic material such as alumina or zirconia is preferable. In order to manufacture the housing 27, a sufficiently small amount of raw material is extruded into a pipe shape, which is then heat-sintered into a pipe shape. A groove is formed in the pipe in a radial direction by a polishing method such as a dicing saw or a wire saw to form a gutter-shaped portion for fixing the transducer 11. The transducer 11 is fixed to the trough-shaped portion 18 with an adhesive such as epoxy, ceramic, or cyanoacrylate.

【0013】ハウジング27の先端部にはステンレス鋼
(SUS304,SUS316等)等の弾性を有する金
属、NiTi系金属等の超弾性金属やポリアセタール等
の樹脂製の棒状の弾性部材19が接着等により接続され
ている。カテーテル先端部弾性部材41は先端が細径に
加工されており、Pt,Ir、Au等の造影性の有する
金属或いはこれらの合金材料から成るリング状部材19
が取り付けられている。図示ではカテーテル先端部17
は先端が開口しているが、閉口していもよく、また外装
シャフト12とは別部材であってもよい。リング状部材
19の替わりに造影性を有するコイル状弾性部材とする
ことで、先端部材41を兼ねることもできる。更に、外
径が0.014mm〜0.025mm程度のガイドワイヤを
挿入することが出来るルーメンを先端部41に設けても
よい。
At the tip of the housing 27, a rod-shaped elastic member 19 made of metal such as stainless steel (SUS304, SUS316, etc.) having elasticity, superelastic metal such as NiTi system metal, or resin such as polyacetal is connected by adhesion or the like. Has been done. The distal end of the catheter distal end elastic member 41 is processed to have a small diameter, and the ring-shaped member 19 is made of a metal having a contrast property such as Pt, Ir, Au or an alloy material thereof.
Is attached. In the drawing, the catheter tip portion 17
Although the tip is open, it may be closed or may be a member separate from the exterior shaft 12. By using a coil-shaped elastic member having contrast properties instead of the ring-shaped member 19, it is possible to serve also as the tip member 41. Further, the distal end portion 41 may be provided with a lumen into which a guide wire having an outer diameter of about 0.014 mm to 0.025 mm can be inserted.

【0014】振動子3の両面の電極32は、信号線7が
接続されている。図6では信号線7は対より線である
が、同軸線であっても良い。
The signal line 7 is connected to the electrodes 32 on both sides of the vibrator 3. Although the signal line 7 is a twisted pair in FIG. 6, it may be a coaxial line.

【0015】駆動シャフト6はステンレス鋼(SUS3
04,SUS316等)の平板を2層2条巻きしてお
り、破断強度は0.4Kgf以上である。駆動シャフト6は
その他に、丸線或いは平板状の金属、樹脂を1層或いは
多層にコイル捲きまたはブレード巻きしたもの、破断強
度0.4Kgf以上のワイヤーに信号線を横巻きにしたもの
であってもよい。
The drive shaft 6 is made of stainless steel (SUS3
No. 04, SUS316, etc.) is wound in two layers and has a breaking strength of 0.4 Kgf or more. The drive shaft 6 is, in addition, a wire or plate-shaped metal or resin coiled or braided in a single layer or multiple layers, or a signal wire wound horizontally on a wire having a breaking strength of 0.4 Kgf or more. Good.

【0016】外装シャフト2は、いわゆるカテーテル素
材であるポリオレフィン系、ポリウレタン系、ポリアセ
タール系、ポリイミド系、フッ素系等の樹脂チューブや
ステンレス系(SUS304,SUS316等)等の金
属チューブ、NiTi系合金等の超弾性金属チューブ、
又、樹脂とステンレス鋼(SUS304,SUS316
等)等のワイヤーをコイル巻き或いはブレード巻きの複
合チューブであり、肉厚は30〜300μmであり、引
っ張り破断強度は少なくとも0.4kgf以上が望ましい。
また、図3、図6に示すようにカテーテル先端側の超音
波の送受部分12は超音波透過性に優れたポリオレフィ
ン系、ポリウレタン系、フッ素系の樹脂が好適であり、
肉厚は10〜100μm程度が好適である。更に、外装
シャフト2の外内面には、親水化樹脂やフッ素樹脂、シ
リコン樹脂等を数10μm以下で被覆してもよい。これ
らの処理により外装シャフト2の外内面の摺動抵抗を下
げることが出来る。又ヘパリンを含有させた樹脂を被覆
することで抗血栓性を付加することもできる。
The outer shaft 2 is made of a so-called catheter material such as a polyolefin-based, polyurethane-based, polyacetal-based, polyimide-based, or fluorine-based resin tube, a stainless-based (SUS304, SUS316, etc.) metal tube, NiTi-based alloy, or the like. Super elastic metal tube,
In addition, resin and stainless steel (SUS304, SUS316
Etc.) is a composite tube in which a wire such as a coil is wound or a coil is wound, the wall thickness is 30 to 300 μm, and the tensile breaking strength is preferably at least 0.4 kgf or more.
Further, as shown in FIGS. 3 and 6, the ultrasonic wave transmitting / receiving portion 12 on the catheter tip side is preferably made of a polyolefin-based resin, a polyurethane-based resin, or a fluorine-based resin excellent in ultrasonic wave permeability,
The wall thickness is preferably about 10 to 100 μm. Furthermore, the outer and inner surfaces of the outer shaft 2 may be coated with a hydrophilic resin, a fluororesin, a silicone resin, or the like with a thickness of several tens of μm or less. By these processes, the sliding resistance of the outer and inner surfaces of the exterior shaft 2 can be reduced. Also, antithrombotic properties can be added by coating with a resin containing heparin.

【0017】本発明の超音波カテーテル10に於ける超
音波走査は、外部ユニット13内のモーター16の回転
運動をカテーテル手元側の手元操作部20内の端子2
1、22を介して駆動シャフト6に伝達し、駆動シャフ
ト6の先端に固定されたハウジング27を回転させるこ
とによって、ハウジング27に設けられたトランスジュ
サ11で送受される超音波をカテーテル2の略径方向に
走査することに依って行われる。ここで得られる超音波
画像は、血管或いは脈管の横断面像である。又、超音波
カテーテル10の全体もしくは、駆動シャフト6を長軸
方向に移動させることに依って、該血管及び脈管の縦断
面像も得られる。
In the ultrasonic scanning of the ultrasonic catheter 10 of the present invention, the rotational movement of the motor 16 in the external unit 13 is controlled by the terminal 2 in the hand operation section 20 on the catheter side.
The ultrasonic waves transmitted and received by the transducer 11 provided in the housing 27 of the catheter 2 are transmitted to the drive shaft 6 via 1, 2 and 22, and the housing 27 fixed to the tip of the drive shaft 6 is rotated. It is performed by scanning in a substantially radial direction. The ultrasonic image obtained here is a cross-sectional image of a blood vessel or a blood vessel. Further, by moving the entire ultrasonic catheter 10 or the drive shaft 6 in the long axis direction, a longitudinal sectional image of the blood vessel and the blood vessel can be obtained.

【0018】次に本発明の超音波カテーテルを血管内で
操作する手順について説明する。ここでは図示しないが
超音波カテーテルは通常の血管カテーテル手技と同様
に、まず体外から血管をイントロデューサ等を用いて確
保し、これに造影用或いは検査、治療カテーテル用のガ
イディングカテーテルをガイドワイヤーにより血管を選
択し挿入する、検査或いは治療すべき目的部位に到達し
たのち、本発明の超音波カテーテルをガイディングカテ
ーテル内に挿入し、血管の断面像を得る。この際にガイ
ドワイヤーはガイディングカテーテルに留置或いは抜去
しても良い。また、別の手技では、バルーンカテーテル
等の治療用カテーテルのガイドワイヤールーメン内に本
発明の超音波カテーテルを挿入して用いることも可能で
ある。この場合、超音波カテーテルの外径は、0.25m
m〜0.97mmであり、0.35mm〜0.46mmが好適であ
る。
Next, a procedure for operating the ultrasonic catheter of the present invention in a blood vessel will be described. Although not shown here, the ultrasonic catheter first secures a blood vessel from outside the body using an introducer or the like in the same manner as a normal vascular catheter procedure, and a guiding catheter for contrast or examination or treatment catheter is attached to this with a guide wire. After the blood vessel is selected and inserted, and after reaching the target site to be inspected or treated, the ultrasonic catheter of the present invention is inserted into the guiding catheter to obtain a cross-sectional image of the blood vessel. At this time, the guide wire may be left in the guiding catheter or removed. In another procedure, the ultrasonic catheter of the present invention can be inserted and used in the guide wire lumen of a therapeutic catheter such as a balloon catheter. In this case, the outer diameter of the ultrasonic catheter is 0.25m
It is m to 0.97 mm, and 0.35 mm to 0.46 mm is preferable.

【0019】図9は本発明の超音波カテーテルの外装シ
ャフトにおける他の変形例を示している。本例では、手
元側の外装シャフト15は2層構造、超音波送受波部を
含む先端側12は1層構造である。手元側15の内層4
8はNiTi系合金等の超弾性金属チューブや、ステン
レス鋼(SUS304,SUS316等)線をコイル或
いはブレード巻きしたチューブであり、外層49は先端
側と同一材のポリオレフィン系、フッ素系等の樹脂であ
る。外層49の形成は、熱収縮による方法、溶剤によっ
て膨潤させ内層に被覆後乾燥収縮させる方法、ディッピ
ング法、溶融押出し成形法等によって行われる。
FIG. 9 shows another modification of the exterior shaft of the ultrasonic catheter of the present invention. In this example, the exterior shaft 15 on the proximal side has a two-layer structure, and the tip side 12 including the ultrasonic wave transmitting / receiving section has a one-layer structure. Inner layer 4 on the hand side 15
Reference numeral 8 denotes a superelastic metal tube such as NiTi alloy, or a tube formed by winding a stainless steel (SUS304, SUS316, etc.) wire into a coil or a blade, and the outer layer 49 is made of the same material as the tip side, such as a polyolefin resin or a fluorine resin. is there. The outer layer 49 is formed by a heat shrinking method, a method of swelling with a solvent to coat the inner layer and then drying and shrinking, a dipping method, a melt extrusion molding method, or the like.

【0020】[0020]

【発明の効果】以上のように本発明によれば、血管及び
脈血管等の体腔内に挿入される細径な超音波カテーテル
において、カテーテル手元側から機械的駆動力を伝達す
る駆動シャフトを内蔵し、該カテーテル先端側に振動子
或いは反射板等を備えた円筒形のハウジング部を有し、
該ハウジングを非導電性セラミックス材料で構成するこ
とによって、該ハウジングが絶縁抵抗が高いために振動
子の電極面を直接接触させても、振動子の外形寸法を従
来に比べて大きくできるため、特に直径1mm以下の細径
な超音波カテーテルの超音波到達深度を深く、方位方向
の超音波の広がりを小さくできるという効果が得られ
る。
As described above, according to the present invention, in a small-diameter ultrasonic catheter to be inserted into a body cavity such as a blood vessel or a vascular vessel, a drive shaft for transmitting a mechanical driving force from the catheter proximal side is incorporated. And has a cylindrical housing portion provided with a vibrator or a reflector on the tip side of the catheter,
Since the housing is made of a non-conductive ceramic material, the outer dimensions of the vibrator can be made larger than those of conventional ones even when the housing has high insulation resistance and the electrode surface of the vibrator is directly contacted. The effect that the ultrasonic wave reaching depth of an ultrasonic catheter having a diameter of 1 mm or less can be deepened and the spread of ultrasonic waves in the azimuth direction can be reduced can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】従来の超音波カテーテルの構造を示す軸方向断
面及びシステム図である。
FIG. 1 is an axial cross section and a system diagram showing a structure of a conventional ultrasonic catheter.

【図2】従来の他の超音波カテーテルの先端部を示す一
部軸方向断面図である。
FIG. 2 is a partial axial cross-sectional view showing the tip of another conventional ultrasonic catheter.

【図3】本発明の超音波カテーテルの一部軸方向断面及
びシステムの構成を示す図である。
FIG. 3 is a diagram showing a partial axial cross-section of the ultrasonic catheter of the present invention and a system configuration.

【図4】本発明の超音波カテーテルの手元操作部及び外
部ユニットの一部軸方向断面図である。
FIG. 4 is a partial axial cross-sectional view of a hand operation part and an external unit of the ultrasonic catheter of the present invention.

【図5】本発明の超音波カテーテルのトランスジューサ
の構造を示す断面図である。
FIG. 5 is a cross-sectional view showing the structure of the transducer of the ultrasonic catheter of the present invention.

【図6】本発明の超音波カテーテルの先端構成図の一部
軸方向断面図である。
FIG. 6 is a partial axial cross-sectional view of the tip configuration diagram of the ultrasonic catheter of the present invention.

【図7】本発明の超音波カテーテルの先端部分上面図で
ある。
FIG. 7 is a top view of the distal end portion of the ultrasonic catheter of the present invention.

【図8】本発明の超音波カテーテルの図6のA-A断面図
である。
8 is a sectional view taken along the line AA of FIG. 6 of the ultrasonic catheter of the present invention.

【図9】本発明の超音波カテーテルの変形例を示す図で
ある。
FIG. 9 is a view showing a modified example of the ultrasonic catheter of the present invention.

【符号の簡単な説明】[Brief description of reference numerals]

1:コンソール 2、12、15、48、49:外装シ
ャフト(カテーテル) 3:振動子 4:反射板 5:送受信回路
6:駆動シャフト 7:信号線 8:駆動源 9:超音波伝達液 10:超音波カテーテル 11:トランスジュ
ーサ 13:外部ユニット 14:造影用金属片 16:
モーター 17:カテーテル先端部、18、27:ハウジング 20:手元操作部 21、22、23、24:端子 2
5:係止部 26:回転摺動端子 31:振動子 32:電極 33、34、36、37:背面材 35:整合層 19:ハウジング先端部弾性部材 41:カテーテ
ル先端部弾性部材
1: Console 2, 12, 15, 48, 49: Exterior shaft (catheter) 3: Transducer 4: Reflector 5: Transmitter / receiver circuit
6: Drive shaft 7: Signal line 8: Driving source 9: Ultrasonic transmission liquid 10: Ultrasonic catheter 11: Transducer 13: External unit 14: Metal piece for contrast imaging 16:
Motor 17: Catheter tip part, 18, 27: Housing 20: Hand operation part 21, 22, 23, 24: Terminal 2
5: Locking part 26: Rotating / sliding terminal 31: Transducer 32: Electrode 33, 34, 36, 37: Back material 35: Matching layer 19: Housing distal end elastic member 41: Catheter distal end elastic member

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】体腔内に挿入して用いられるカテーテルに
手元側から先端側まで機械的駆動力を伝達する駆動シャ
フトを内蔵し、該カテーテルの先端側に超音波振動子及
びまたは超音波反射板を備えたハウジングを該駆動シャ
フトに接続し、該駆動シャフトを外部駆動源により回転
或いは並進させる超音波カテーテルであって、該ハウジ
ングを非導電性材料で構成したことを特徴とする超音波
カテーテル。
1. A catheter that is inserted into a body cavity and has a built-in drive shaft that transmits a mechanical driving force from the proximal side to the distal side, and an ultrasonic transducer and / or an ultrasonic reflector is provided at the distal side of the catheter. An ultrasonic catheter in which a housing provided with is connected to the drive shaft, and the drive shaft is rotated or translated by an external drive source, wherein the housing is made of a non-conductive material.
【請求項2】該ハウジングをアルミナ、ジルコニア等の
セラミック材料で構成したことを特徴とする請求項1記
載の超音波カテーテル。
2. The ultrasonic catheter according to claim 1, wherein the housing is made of a ceramic material such as alumina or zirconia.
【請求項3】該ハウジングを円筒形とし、該円筒形のハ
ウジングの一部分を径方向に樋状に加工し、該振動子を
該ハウジングの樋状部分に接触するようにして構成した
ことを特徴とする請求項1記載の超音波カテーテル。
3. The housing is formed into a cylindrical shape, and a part of the cylindrical housing is processed into a gutter shape in the radial direction, and the vibrator is configured to contact the gutter-shaped portion of the housing. The ultrasonic catheter according to claim 1.
JP16561995A 1995-06-30 1995-06-30 Ultrasonic catheter Pending JPH0910216A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP16561995A JPH0910216A (en) 1995-06-30 1995-06-30 Ultrasonic catheter
US08/672,119 US5738100A (en) 1995-06-30 1996-06-27 Ultrasonic imaging catheter
EP96401444A EP0754430B1 (en) 1995-06-30 1996-06-28 Ultrasonic imaging catheter
DE69633157T DE69633157T2 (en) 1995-06-30 1996-06-28 Catheter for ultrasound imaging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16561995A JPH0910216A (en) 1995-06-30 1995-06-30 Ultrasonic catheter

Publications (1)

Publication Number Publication Date
JPH0910216A true JPH0910216A (en) 1997-01-14

Family

ID=15815810

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16561995A Pending JPH0910216A (en) 1995-06-30 1995-06-30 Ultrasonic catheter

Country Status (1)

Country Link
JP (1) JPH0910216A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004529684A (en) * 2001-03-02 2004-09-30 シメッド ライフ システムズ インコーポレイテッド Mapping catheter for use in guide catheters
WO2006062164A1 (en) * 2004-12-09 2006-06-15 Hitachi Medical Corporation Ultrasonic probe and ultrasonic diagnosis device
JP2006212076A (en) * 2005-02-01 2006-08-17 Fuji Photo Film Co Ltd Ultrasonic transducer, its manufacturing method, and ultrasonic probe
US11051761B2 (en) 2015-06-15 2021-07-06 Sunnybrook Research Institute Intravascular imaging catheters and methods of use thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004529684A (en) * 2001-03-02 2004-09-30 シメッド ライフ システムズ インコーポレイテッド Mapping catheter for use in guide catheters
JP2010188190A (en) * 2001-03-02 2010-09-02 Boston Scientific Scimed Inc Imaging catheter for use inside guiding catheter
WO2006062164A1 (en) * 2004-12-09 2006-06-15 Hitachi Medical Corporation Ultrasonic probe and ultrasonic diagnosis device
US7834520B2 (en) 2004-12-09 2010-11-16 Hitachi Medical Coporation Ultrasonic probe and ultrasonic diagnosis apparatus
JP2006212076A (en) * 2005-02-01 2006-08-17 Fuji Photo Film Co Ltd Ultrasonic transducer, its manufacturing method, and ultrasonic probe
JP4560417B2 (en) * 2005-02-01 2010-10-13 富士フイルム株式会社 Ultrasonic transducer, manufacturing method thereof, and ultrasonic probe
US11051761B2 (en) 2015-06-15 2021-07-06 Sunnybrook Research Institute Intravascular imaging catheters and methods of use thereof

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