JP6270506B2 - 積層型超音波振動デバイスおよび超音波医療装置 - Google Patents
積層型超音波振動デバイスおよび超音波医療装置 Download PDFInfo
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Description
また、本発明における一態様の超音波医療装置は、2つのマス材の間に複数の圧電体が設けられ、前記2つのマス材および前記複数の圧電体よりも弾性定数が小さなろう材、すなわち、柔らかいろう材を用いて、同種材料の接合となる前記複数の圧電体間を第1の厚さを有した第1の金属接合層によって接合し、異種材料の接合となる前記複数の圧電体と前記マス材との間を前記第1の厚さよりも厚い第2の厚さを有した第2の金属接合層によって接合した積層型超音波振動デバイスと、前記積層型超音波振動デバイスで発生した超音波振動が伝達され生体組織を処置するプローブ先端部と、を具備する。
図1は、超音波医療装置の全体構成を示す断面図、図2は振動子ユニットの全体の概略構成を示す図、図3は超音波振動子の構成を示す斜視図、図4は超音波振動子の構成を示す側面図、図5は圧電単結晶ウエハを示す斜視図、図6は下地金属が成膜された圧電単結晶ウエハを示す斜視図、図7はダイシングされる圧電単結晶ウエハを示す斜視図、図8は圧電単結晶ウエハから切り出された圧電単結晶体を示す斜視図、図9は超音波振動子を含む振動子ユニットの分解斜視図、図10は振動子ユニットの超音波振動子へフレキシブルプリント基板を実装前の断面図、図11は振動子ユニットの超音波振動子へフレキシブルプリント基板を実装後の断面図、図12は超音波振動子にFPCが実装された振動子ユニットを示す斜視図、図13は接合金属の厚さに対するマス材との熱膨張係数の差から圧電単結晶体に生じる熱応力の関係を示すグラフ、図14はマス材と圧電単結晶体の間に設けられる接合金属の一例を示す分解斜視図である。
図1に示す、超音波医療装置1は、主に超音波振動を発生させる超音波振動子2を有する振動子ユニット3と、その超音波振動を用いて患部の凝固/切開処置を行うハンドルユニット4とが設けられている。
ここで、振動子ユニット3について説明する。
振動子ユニット3は、図2に示すように、超音波振動子2と、この超音波振動子2で発生した超音波振動を伝達する棒状の振動伝達部材であるプローブ6とを一体的に組み付けたものである。
ここで、本発明の積層型超音波振動デバイスとしての超音波振動子2について以下に説明する。
振動子ユニット3の超音波振動子2は、図3および図4に示すように、先端から順に振動伝達部材の1つであるプローブ本体34に螺着などされて接続された上述のホーン32と、このホーン32の後方に連設された、ここでは矩形状(四角柱形状)の積層振動子41と、ホーン32の基端から電気ケーブル36まで積層振動子41を覆うカバー体51と、を有して構成されている。
次に、以上に説明した超音波振動子2の製造方法について、以下に詳しく説明する。
先ず、超音波振動子2は、キュリー温度(キュリー点)が高く、接合金属の融点でも圧電特性が劣化しない圧電材料を使用し、ここでは単結晶材料としてのニオブ酸リチウム(LiNbO3)からなる圧電単結晶ウエハ71(図5参照)から作成される。
具体的には、圧電単結晶ウエハ71は、表裏面上に非鉛はんだと良好な密着性および濡れ性を有する、例えば、Ti/Ni/Au、Ti/Pt/Au、Cr/Ni/AuまたはCr/Ni/Pd/Auからなる下地金属72が蒸着、スパッタ、鍍金などによって成膜される。
次に、図7および図8に示すように、下地金属72が成膜された圧電単結晶ウエハ71から矩形状に圧電体チップとしての圧電単結晶体61を切出加工する。
具体的には、圧電単結晶ウエハ71が厚さの薄いダイシングブレードによって、図7に示す破線(仮想線)に沿って切り出され、図8に示すような矩形状の圧電体チップとしての圧電単結晶体61が複数抽出される。このような構成により、複数の圧電単結晶体61を安価に製造することができる。
具体的には、4つの圧電単結晶体61の下地金属72の間に、第1の接合材料として非鉛はんだである第1のろう材73が設けられる。
具体的には、超音波振動子2の正電側接合金属62および負電側接合金属63は、FPC47,48の電気接点と、はんだ、導電性ペーストなどを用いて形成された電気接続部49を介して電気的に接続される。
2…超音波振動子
3…振動子ユニット
4…ハンドルユニット
5…操作部
6…プローブ
7…外套管
8…挿入シース部
9…操作部本体
10…固定ハンドル
11…可動ハンドル
12…回転ノブ
13…スリット
14…ハンドルストッパ
15…ハンドル支軸
16…連結アーム
17…操作パイプ
18…大径部
19…操作パイプ
20…スライダ
22…固定リング
23…把持部
30…先端処置部
31…先端部
32…ホーン
32a…ネジ部
33…外向フランジ
34…プローブ本体
35…ゴムライニング
36…電気ケーブル
36a,36b…配線
41…積層振動子
42…フロントマス
42a…ネジ穴
43…バックマス
49…電気接続部
51…カバー体
52…折れ止
61…圧電単結晶体
62…正電側接合金属
63…負電側接合金属
71…圧電単結晶ウエハ
72…下地金属
73…第1のろう材
76…第2のろう材
Claims (7)
- 2つのマス材の間に複数の圧電体が設けられた積層型超音波振動デバイスにおいて、
前記2つのマス材および前記複数の圧電体よりも弾性定数が小さなろう材を用いて、同種材料接合部となる前記複数の圧電体間を第1の厚さを有した第1の金属接合層によって接合し、異種材料接合部となる前記複数の圧電体と前記マス材との間を前記第1の厚さよりも厚い第2の厚さを有した第2の金属接合層によって接合したことを特徴とする積層型超音波振動デバイス。 - 前記複数の圧電体が圧電単結晶材料であることを特徴とする請求項1に記載の積層型超音波振動デバイス。
- 前記第1の金属接合層および第2の金属接合層が電極層となることを特徴とする請求項1または請求項2に記載の積層型超音波振動デバイス。
- 前記ろう材の熱膨張係数は、前記複数の圧電体の熱膨張係数と、前記2つのマス材の熱膨張係数の中間の範囲内とすることを特徴とする請求項1から請求項3のいずれか1項に記載の積層型超音波振動デバイス。
- 前記ろう材に、前記第1の厚さを有するはんだペレットが用いられ、
前記第2の厚さが前記第1の厚さの整数倍に設定されていることを特徴とする請求項1から請求項4のいずれか1項に記載の積層型超音波振動デバイス。 - 前記第2の厚さの上限は、前記2つのマス材との熱膨張係数の差によって前記複数の圧電体に生じる熱応力が変化しなくなる最も薄い厚さとしたことを特徴とする請求項1から請求項5のいずれか1項に記載の積層型超音波振動デバイス。
- 請求項1から請求項6のいずれか1項に記載の前記積層型超音波振動デバイスと、
前記積層型超音波振動デバイスで発生した超音波振動が伝達され生体組織を処置するプローブ先端部と、
を具備することを特徴とする超音波医療装置。
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PCT/JP2015/051542 WO2015111622A1 (ja) | 2014-01-27 | 2015-01-21 | 積層型超音波振動デバイスおよび超音波医療装置 |
EP15739798.5A EP3101912B1 (en) | 2014-01-27 | 2015-01-21 | Laminated ultrasonic vibration device and ultrasonic medical apparatus |
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