JP2014184347A - カテーテル孔アレイの効率を改善するためのシステムと方法 - Google Patents
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- A—HUMAN NECESSITIES
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- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
- A61M25/007—Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
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- A—HUMAN NECESSITIES
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- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
- A61M2025/0073—Tip designed for influencing the flow or the flow velocity of the fluid, e.g. inserts for twisted or vortex flow
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Abstract
【解決手段】末梢カテーテル(414)は、カテーテル内の注入液の吐出速度を低下させるためのカテーテル先端(420)の拡散手段を有する。複数の拡散側孔(450)がカテーテル先端部分に設けられる。いくつかの例ではさらに、環状に互い違いに配置された複数の拡散孔が静脈カテーテルの先端部分に設けられ、拡散孔から吐出される注入液を効率化する。各拡散孔の内面(464)はさらに、カテーテル内腔(490)の内面(482)に関して角度が付けられ、内腔内の注入液が拡散孔から90°未満の角度で吐出される。
【選択図】図4B
Description
診断に必要な造影剤の量を減らすために、単位血液量当たりの造影剤の濃度は、カテーテル先端の速度を高めずに、造影剤の体積流量を増加することによって高くする必要がある。上記の必要な目的は本発明の要素によって達成することができ、これについて以下に説明する。
標準的カテーテルの先端の噴流速度は、体積流量5ml/秒の設定で1,000インチ/秒を超えるため、患者の静脈壁には大きな力が掛かる。この力は、静脈構造が最適でない患者にとって危険であり、流量増加による溢出または内膜損傷の可能性が高くなる。
標準的な22GAX1.00″カテーテルを使った注入システムと、図4A、4Bに関連して先に説明したように、複数の拡散孔を設けて改造した22GAX1.00″カテーテル(P_inj#1とP_inj#2)を使った注入システムと、の間において、注入システム内の内圧を比較した。
カテーテルの内壁面に関して約45°で穿孔された複数の拡散孔を有するように改造された標準的22GAX1.00″カテーテルについて、数値流体力学解析を実行した。解析の結果、カテーテルの内壁面に関して90°で穿孔された複数の拡散孔を有する標準的な22GAX1.00″カテーテルと比較した場合、主流から拡散孔へのバルク流の転向はさらに6%増大した。解析により、標準カテーテルのまっすぐの孔と比較して、拡散孔450の断面を通る流量492は大きく増加したことが分かった。本発明の拡散孔450には確かに若干の再循環渦494が発生したが、再循環渦494は、標準的カテーテルの循環渦392と比較するとずっと弱かった。液流492の代表的な図を1図4Bに示す。
標準的な末梢静脈カテーテルでは、カテーテルの内腔がカテーテル先端に向かって細くなるため、収縮によって注入物が加速すると、反跳力が発生する。この力は、消火ホースを握るときに感じられる力に似ている。消火ホースと同様に、圧縮的な反跳力を受けるカテーテル先端は不安定となって、静脈内で激しく振動することがあり(catheter whip現象と呼ばれる)、前述のような静脈損傷の原因となりうる。十分な注入物が拡散孔を通じて軸方向から転向されると、反跳力は負となり、実際にカテーテル先端が引っ張られ、カテーテル先端が緊張状態にあると、挿入されたカテーテルが大幅に安定化する。したがって、いくつかの実施形態では、孔の角度を戦略的に選択し、拡散孔からの流量の増大と、拡散孔を通じた注入物の軸方向の流量の減少によるカテーテル先端の反跳力の低下と、のバランスを取る。
Claims (12)
- 所定の直径と壁厚を有し、近位端、遠位端およびその間に延びる内腔を有し、さらに患者の末梢静脈を確保するために十分な切頭された長さを有する管状本体部材と、
前記管状本体部材の前記遠位端を形成し、かつ前記内腔への遠位側のカーテル先端開口部を有するテーパの付いた先端であって、前記遠位側のカテーテル先端開口部は塞がれずに流体の流れを許容する、テーパの付いた先端と、
前記管状本体部材の前記テーパの付いた先端に設けられる複数の孔であって、前記複数の孔は、前記管状本体部材の前記壁厚を貫通して形成されて、前記内腔と連通して拡散孔のアレイを画定し、かつ前記複数の孔は、第一の環状輪に配置された第一の集合の孔と、第二の環状輪に配置される第二の集合の孔と、を含み、前記第二の集合の孔は、前記第一の集合の孔と約15°ないし約60°で軸方向にずれている、複数の孔と、
を備えることを特徴とする末梢カテーテル。 - 前記複数の孔は複数の互い違いの孔を含み、前記複数の互い違いの孔は、前記管状本体部材の前記壁厚を貫通して形成され、前記内腔と連通して、拡散孔の互い違いのアレイを画定することを特徴とする請求項1に記載の末梢カテーテル。
- 前記テーパの付いた先端には、前記管状本体部材の前記所定の直径よりも小さい直径となるようにテーパが付けられること特徴とする請求項1に記載の末梢カテーテル。
- 前記第二の集合の孔は、前記第一の集合の孔と約45°で軸方向にずれていることを特徴とする請求項1に記載の末梢カテーテル。
- 前記内腔は、第一の平面を画定する第一の内壁面をさらに有し、互い違いの各孔は、第二の平面を画定する第二の内壁面をもつ流路をさらに有し、前記第二の平面の方位は、前記第一の平面の方位に対して鋭角であることを特徴とする請求項1に記載の末梢カテーテル。
- 前記第二の平面の前記方位は、前記第一の平面の前記方位に関して約45°であることを特徴とする請求項5に記載の末梢カテーテル。
- 前記第二の平面の前記第一の平面に関する方位は約15°ないし約75°であることを特徴とする請求項5に記載の末梢カテーテル。
- 所定の直径と壁厚を有し、近位端、遠位端およびその間に延びる内腔を有し、さらに患者の末梢静脈を確保するために十分な切頭された長さを有し、前記内腔が第一の平面を画定する第一の内壁面をさらに含む管状本体部材と、
前記管状本体部材の前記遠位端を形成し、かつ前記内腔への遠位側のカーテル先端開口部を有するテーパの付いた先端であって、前記遠位側のカテーテル先端開口部は塞がれずに流体の流れを許容する、テーパの付いた先端と、
前記管状本体部材の前記テーパの付いた先端に設けられる複数の孔であって、前記管状本体部材の前記壁厚を貫通して形成され、前記内腔と連通して拡散孔のアレイを画定し、各孔は第二の平面を画定する第二の内壁面をもつ流路をさらに有し、前記第二の平面の方位は前記第一の平面の方位に対して鋭角であり、前記複数の孔は、第一の環状輪に配置された第一の集合の孔と、第二の環状輪に配置される第二の集合の孔と、を含み、前記第二の集合の孔は、前記第一の集合の孔と約15°ないし約60°で軸方向にずれて拡散孔の互い違いのアレイを形成する、複数の孔と、
を備えることを特徴とする末梢カテーテル。 - 前記第二の平面の前記方位は、前記第一の平面の前記方位に関して約45°であることを特徴とする請求項8に記載の末梢カテーテル。
- 前記第二の集合の孔は、前記第一の集合の孔から軸方向に約45°ずれていることを特徴とする請求項8に記載の末梢カテーテル。
- 上流の孔と下流の孔との間に位置付けられた長いギャップをさらに有することを特徴とする請求項8に記載の末梢カテーテル。
- 第三の環状輪に配置された第三の集合の孔をさらに備え、前記第三の集合の孔は、前記第二の集合の孔と軸方向にずれ、前記第一の集合の孔は、前記第三の集合の孔と軸方向に整列することを特徴とする請求項8に記載の末梢カテーテル。
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US12/427,633 US8403911B2 (en) | 2008-04-22 | 2009-04-21 | Systems and methods for improving catheter hole array efficiency |
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BR (1) | BRPI0911669B8 (ja) |
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BRPI0911669B1 (pt) | 2020-02-11 |
ES2809236T3 (es) | 2021-03-03 |
CN102065945B (zh) | 2014-02-19 |
US8403911B2 (en) | 2013-03-26 |
EP2279022A1 (en) | 2011-02-02 |
WO2009132065A1 (en) | 2009-10-29 |
BRPI0911669B8 (pt) | 2021-06-22 |
BRPI0911669A2 (pt) | 2018-03-27 |
EP2279022B1 (en) | 2020-05-27 |
JP2011518024A (ja) | 2011-06-23 |
US20090287186A1 (en) | 2009-11-19 |
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BRPI0911669A8 (pt) | 2018-05-08 |
CN102065945A (zh) | 2011-05-18 |
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