DE10038737A1 - Catheter for magnetic resonance supported interventions, comprises a hollow section through which a media flows, and supply and removal openings - Google Patents

Catheter for magnetic resonance supported interventions, comprises a hollow section through which a media flows, and supply and removal openings

Info

Publication number
DE10038737A1
DE10038737A1 DE10038737A DE10038737A DE10038737A1 DE 10038737 A1 DE10038737 A1 DE 10038737A1 DE 10038737 A DE10038737 A DE 10038737A DE 10038737 A DE10038737 A DE 10038737A DE 10038737 A1 DE10038737 A1 DE 10038737A1
Authority
DE
Germany
Prior art keywords
catheter
magnetic resonance
supply
interventions
signal
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.)
Withdrawn
Application number
DE10038737A
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German (de)
Inventor
Oliver Wendt
Peter Diesing
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Individual
Original Assignee
Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to DE10038737A priority Critical patent/DE10038737A1/en
Publication of DE10038737A1 publication Critical patent/DE10038737A1/en
Withdrawn legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M25/00Catheters; Hollow probes
    • A61M25/01Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0127Magnetic means; Magnetic markers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3954Markers, e.g. radio-opaque or breast lesions markers magnetic, e.g. NMR or MRI

Abstract

A catheter for magnetic resonance supported interventions, enables a magnetic resonance signal delivery media (2a) to be placed in a chosen location to give an intense signal. The medium is placed in or flows in a hollow section (2b). The catheter (1) has at least one supply and removal point.

Description

Die Erfindung betrifft einen Katheter für magnetresonanztomographische Untersuchungen, der in MR-tomographischen Schnittbildern sichtbar gemacht werden kann und mit dem sich anatomische Strukturen wie Blutgefäße signalintensiv darstellen lassen.The invention relates to a catheter for magnetic resonance imaging examinations, which can be made visible in MR tomographic sectional images and with which Have anatomical structures such as blood vessels displayed in a signal-intensive manner.

Die Magnetresonanztomographie ist ein zunehmend verbreitetes bildgebendes Verfahren mit starken Magnetfeldern ohne Strahlung und basiert in erster Linie auf gezielter Anregung und Messung von Wasserstoffatomen unter Resonanz. Dabei hängt die Signalintensität wesentlich von der Anzahl der am Meßort vorhandenen Wasserstoffatomkerne ab, so daß sich unterschiedliche Wasserstoffdichten im MR-tomographischen Schnittbild in entsprechende Signalintensitätsstufen differenzieren lassen. Ist die Anzahl dieser Wasserstoffatomkerne in einem Körper jedoch nur gering, so ist auch das Signal dementsprechend schwach und die Meßstelle oder das Meßobjekt ist im Schnittbild nur schwach oder gar nicht zu erkennen. Dies stellt zugleich ein großes Problem konventioneller Katheter dar, da diese aufgrund ihrer Materialbeschaffenheit keine Signalintensität hervorrufen und damit deren eindeutige Lage und Abbildung im MR-tomographischen Schnittbild bzw. im darzustellenden Körperteil nicht sichtbar gemacht werden kann.Magnetic resonance imaging is an increasingly common imaging technique with strong magnetic fields without radiation and is primarily based on targeted excitation and measurement of hydrogen atoms under resonance. The signal intensity depends on this depends essentially on the number of hydrogen atom nuclei present at the measuring location, so that different hydrogen densities in the MR tomographic sectional image in corresponding Have signal intensity levels differentiated. Is the number of these hydrogen atom nuclei in However, if the body is only slight, the signal is correspondingly weak and the The measuring point or the measuring object is only weakly or not at all recognizable in the sectional view. This also represents a major problem with conventional catheters, because of their Material properties do not cause signal intensity and thus their clear location and not in the MR tomographic sectional image or in the body part to be displayed can be made visible.

Mit steigender Indikationsstellung in der MR-Diagnostik und Therapie, wird die Forderung nach visualisierbaren Kathetern und Körperteilen wie z. B. von Herzgefäßen immer deutlicher.With increasing indications in MR diagnostics and therapy, the demand for visualizable catheters and body parts such as B. of cardiac vessels more and more clearly.

Die Erfindung hat sich der Lösung dieser Aufgabe gestellt, durch die Verwendung von Kathetern, die mit signalgebenden Medien versehen werden können oder den Transport dieser signalgebenden Medien in einen Körper ermöglichen.The invention has solved this problem by using Catheters that can be provided with signaling media or the transport of these enable signaling media in a body.

Die Erfindung löst das Problem durch die Unterbringung oder Durchströmung signalgebender Medien in speziell gestalteten Katheterschläuchen. Die signalgebenden Medien können dabei in Hohlräumen oder direkt auf der Oberfläche der Katheterschläuche angeordnet sein. Zum Durchströmen des signalgebenden Mediums durch einen Katheter bis zum Untersuchungsort, befindet sich mindestens eine Zu- und Abflußöffnung am Katheter.The invention solves the problem by accommodating or flowing signal Media in specially designed catheter tubes. The signaling media can do this be arranged in cavities or directly on the surface of the catheter tubes. To the Flow through the signaling medium through a catheter to the examination site, there is at least one inlet and outlet opening on the catheter.

Ausführungsbeispiele zu diesen Kathetern werden anhand der Fig. 1 bis 7 gezeigt. Dabei zeigen:Exemplary embodiments of these catheters are shown with reference to FIGS. 1 to 7. Show:

Fig. 1a einen Querschnitt eines Katheters integrierter Kontrastmittelunterbringung, FIG. 1a is a cross section of a catheter integrated contrast medium housing,

Fig. 1b einen Querschnitt eines Katheters mit Kontrastmittelapplizierung durch den Katheter, FIG. 1b a cross section of a catheter with Kontrastmittelapplizierung through the catheter,

Fig. 2 einen Katheter mit oberflächennahen kontrastgebenden Schichten, Fig. 2 shows a catheter with near-surface opacifying layers,

Fig. 3 einen Katheter mit lokaler Signalquelle, Fig. 3 shows a catheter with a local signal source,

Fig. 4 einen Katheter mit fein dispers verteilten kontrastfähigen Medien, Fig. 4 shows a catheter with finely dispersely distributed capable contrast media,

Fig. 5 einen Katheter mit in radialer Richtung angeordneten Öffnungen zur Applizierung von Konstrastmittel, Fig. 5 shows a catheter disposed in the radial direction of openings for application of contrast agents,

Fig. 6 einen Katheter mit in axialer Richtung angeordneten Öffnungen zur Applizierung von Kontrastmittel, Fig. 6 shows a catheter disposed in the axial direction, openings for application of a contrast agent,

Fig. 7 beispielhafte Darstellungen von Katheterquerschnitten mit Anordnungen von signalgebenden Lumina und weiteren Hohlräumen in einem Katheter. Fig. 7 are explanatory views of catheter sections with arrays of signaling lumens and other cavities in a catheter.

Gemäß der Erfindung beinhaltet der in Fig. 1a dargestellte Katheter 1 ein im Katheter eingeschlossenes MR-signalgebendes Medium 2a und ein Lumen 3, das z. B. zur Injektion von Flüssigkeiten aus diagnostischen oder therapeutischen Gründen verwendet werden kann. Die Fig. 1b stellt beispielhaft eine weitere Ausgestaltung des Katheters 1 dar. Hierbei kann das MR-signalgebende Medium 2a über einen Zugang und durch eine Öffnung 4 einem Körper zugefügt werden.According to the invention the catheter 1 shown in Fig. 1a includes a trapped in the catheter MR signal forming medium 2a and a lumen 3, z. B. can be used for the injection of liquids for diagnostic or therapeutic reasons. FIG. 1b exemplifies a further embodiment of the catheter 1. Here, a body, the MR-signal-generating medium 2 a via access through an opening 4 are added.

Beispielsweise ist entsprechend Fig. 2 das MR-signalgebende Medium 2a zwischen dem Katheterschlauch 1 und einem Mantel 5, der ein Schlauch sein kann, plaziert.For example, according to FIG. 2, the MR signaling medium 2 a is placed between the catheter tube 1 and a jacket 5 , which can be a tube.

Häufig wird bei den beschriebenen Anwendungen die genaue Position eines Teils (z. B. eines Ballons) des Katheters benötigt, der dann durch einen in Fig. 3 beschriebenen örtlich begrenzten MR-signalgebenden Bereich lokalisiert werden kann. Dabei wird auf einem Teilabschnitt des Katheters 1 das signalgebende Medium 2a radial aufgebracht und durch eine zusätzliche Deckschicht 6, die z. B ein Schlauchabschnitt sein kann, abgedeckt.In the applications described, the exact position of a part (eg a balloon) of the catheter is often required, which can then be localized by means of a locally limited MR signaling region described in FIG. 3. The signaling medium 2 a is applied radially to a portion of the catheter 1 and by an additional cover layer 6 , the z. B can be a hose section covered.

Eine weitere Möglichkeit zur Anpassung der signalgebenden Eigenschaften eines Katheters ist gemäß Fig. 4 das auf die signalgebenden Eigenschaften abgestimmte fein disperse Einbringen von MR-signalgebenden Medium 2a in den Katheterschlauch 1, wodurch besonders homogene Materialeigenschaften des Katheters erreicht werden können.A further possibility for adaptation of a catheter of the signal-generating properties shown in Fig. 4, adapted to the signal-generating properties of finely dispersed introduction of MR-signal-generating medium 2 a of the catheter can be achieved in the catheter tube 1, whereby particularly homogeneous material properties.

In Fig. 5 und Fig. 6 werden die Möglichkeiten dargestellt, durch Öffnungen 4 in dem Katheter 1 ein MR-signalgebendes Medium 2a zu injizieren. Dabei können diese Öffnungen 4 gemäß der Erfindung entsprechend Fig. 5 in radialer Richtung an dem Katheter 1 angeordnet sein oder entsprechend Fig. 6 in axialer Richtung die Applizierung von signalgebenden Medien 2a ermöglichen.In Fig. 5 and Fig. 6, the options are displayed, through openings 4 in the catheter 1, an MR signal forming medium 2 to inject a. In this case, these openings 6 can 4 according to the invention corresponding to Fig. 5 may be arranged in radial direction on the catheter 1, or according to Fig. Axially the Applizierung of signaling media 2 a permit.

Die Möglichkeiten zur Anordnung der Lumina für das signalgebende Medium 2a und der Lumina 3 zur Einführung weiterer diagnostischer oder therapeutischer Hilfsmittel ist in Fig. 7 dargestellt.The possibilities for arranging the lumens for the signaling medium 2 a and the lumens 3 for introducing further diagnostic or therapeutic aids are shown in FIG. 7.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11

Katheter
catheter

22

a signalgebendes Medium
a signaling medium

22

b Lumen
b lumens

33

Hohlraum im Katheter
Cavity in the catheter

44

Radiale/Axiale Öffnungen
Radial / axial openings

55

Mantel
coat

66

Lokale Deckschicht
Local top layer

Claims (6)

1. Katheter für MR-gestützte Interventionen, der sich durch Plazieren von MR­ signalgebenden Medien (2a) vollständig oder in ausgewählten Abschnitten im MR­ tomographischen Schnittbild signalintensiv abbilden läßt und/oder mit dessen Hilfe sich MR-signalgebende Medien (2a) (1) einem Körper zuführen lassen.1. Catheter for MR-guided interventions, which can be achieved by placing the MR signal-generating media pictures (2 a) tomographic completely or in selected portions of the MR slice image signal intensively and / or MR-signal-generating means of which media (2 a) (1 ) have it delivered to a body. 2. Katheter nach Anspruch 1, ausgezeichnet dadurch, daß sich das MR-signalgebende Medium (2a) in mindestens einem Hohlraum (2b) unterbringen oder durchströmen läßt.2. Catheter according to claim 1, characterized in that the MR signaling medium ( 2 a) in at least one cavity ( 2 b) can be accommodated or flowed through. 3. Katheter nach Anspruch 1, ausgezeichnet dadurch daß MR-signalgebendes Medium (2a) fein dispers im Material des Katheters (1) verteilt ist.3. Catheter according to claim 1, characterized in that the MR signaling medium ( 2 a) is finely dispersed in the material of the catheter ( 1 ). 4. Katheter nach Anspruch 1, ausgezeichnet dadurch, daß der Katheter (1) mindestens einen Zu- und Abfluß für das MR-signalgebende Medium (2a) in radialer und/oder axialer Anordnung (4) am Katheter besitzt.4. Catheter according to claim 1, characterized in that the catheter ( 1 ) has at least one inflow and outflow for the MR signaling medium ( 2 a) in a radial and / or axial arrangement ( 4 ) on the catheter. 5. Katheter nach Anspruch 1, ausgezeichnet dadurch, daß das MR-signalgebende Medium (2a) für das umgebende Medium löslich oder unlöslich aufgebracht ist.5. Catheter according to claim 1, characterized in that the MR signaling medium ( 2 a) for the surrounding medium is applied soluble or insoluble. 6. Katheter nach Anspruch 1, ausgezeichnet dadurch, daß für die Zuführung und/oder Unterbringung von Stoffen wie Medikamenten, Infusionslösungen, Führungsdrähten, Implantaten oder medizinischen Instrumenten mindestens ein Hohlraum (3) im Katheter (1) vorhanden ist.6. Catheter according to claim 1, characterized in that at least one cavity ( 3 ) is present in the catheter ( 1 ) for the supply and / or accommodation of substances such as medications, infusion solutions, guide wires, implants or medical instruments.
DE10038737A 2000-08-02 2000-08-02 Catheter for magnetic resonance supported interventions, comprises a hollow section through which a media flows, and supply and removal openings Withdrawn DE10038737A1 (en)

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