DE4014947A1 - Flexible catheter for diagnostic or therapeutic purposes - has very small guiding magnet of high remanence at distal end and extra corporal control magnets - Google Patents

Flexible catheter for diagnostic or therapeutic purposes - has very small guiding magnet of high remanence at distal end and extra corporal control magnets

Info

Publication number
DE4014947A1
DE4014947A1 DE19904014947 DE4014947A DE4014947A1 DE 4014947 A1 DE4014947 A1 DE 4014947A1 DE 19904014947 DE19904014947 DE 19904014947 DE 4014947 A DE4014947 A DE 4014947A DE 4014947 A1 DE4014947 A1 DE 4014947A1
Authority
DE
Grant status
Application
Patent type
Prior art keywords
control
magnets
catheter
guiding
end
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Withdrawn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
DE19904014947
Other languages
German (de)
Inventor
Wolfgang Dr Med Ram
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.)
RAM, WOLFGANG, DR.MED., 2300 KIEL, DE
Original Assignee
Wolfgang Dr Med Ram
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/04Detecting, measuring or recording bioelectric signals of the body or parts thereof
    • A61B5/0402Electrocardiography, i.e. ECG
    • A61B5/0452Detecting specific parameters of the electrocardiograph cycle
    • A61B5/0456Detecting R peaks, e.g. for synchronising diagnostic apparatus
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/70Manipulators specially adapted for use in surgery
    • A61B34/73Manipulators for magnetic surgery
    • 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

Abstract

The catheter is for application in cavities and channels of the human body, esp in the form of a flexible heart catheter. A very small guiding magnet (2) of high remanence is provided at the distal end. The end of the catheter is controlled by magnets extracorporally arranged. The guiding magnet is in the form of a cylinder a few millimetres in length. The control magnets are manually guided permanent magnets. Alternatively, they (5) are spatially fixed electro magnets with field strengths regulated via a control unit (7) and control lever (6). Pref, at least four control magnets are provided arranged in the corners of a tetrahedron. The control unit can be ECG-triggered. ADVANTAGE - Better guiding and placing of catheter at reduced risk.

Description

Die Erfindung betrifft einen Katheter für diagnostische oder therapeutische Zwecke zum Einsatz in Hohlräumen und Kanälen des menschlichen Körpers insbesondere einen Herzkatheter. The invention relates to a catheter for diagnostic or therapeutic purposes for use in cavities and channels of the human body, in particular a cardiac catheter.

Die im medizinischen Bereich verwendeten Katheter sind hohle flexible Schläuche aus Kunststoffen, die wegen ihrer Flexi bilität beim einführen in die Hohlräume oder Kanäle, z. The catheters used in the medical field are hollow flexible tubes of plastics, because of their stability Flexi during insertion into the cavities or channels, for example. B. Blutgefäße des menschlichen Körpers, einen Führungsdraht er fordern (DBP 34 47 642). B. blood vessels of the human body, a guide wire he request (DBP 34 47 642). Durch besondere Gestaltung des Endes des Führungsdrahtes kann das distale Ende des Katheters beim Einführen nur in gewissen Grenzen gelenkt werden. By special design of the end of the guidewire, the distal end of the catheter during insertion can be directed only within certain limits. Besondere Schwierigkeiten ergeben sich bei der Katheterisierung des Herzens. Particular difficulties arise in the catheterization of the heart.

Der Erfindung liegt deshalb die Aufgabe zugrunde, einen neuen Katheter zu beschreiben, der eine bessere Führung des distalen Endes des Katheters gestattet und vor allem eine Einführung und Plazierung des Katheters mit einem geringeren Risiko gestattet. The invention is therefore based on the object to describe a new catheter allows for a better guidance of the distal end of the catheter and especially an introduction and placement of the catheter equipped with a lower risk. Die gestellte Aufgabe wird durch einen Katheter mit den im Kennzeichen des Patentanspruchs 1 angege benen Merkmalen gelöst. The stated object is achieved by a catheter having the angege in the characterizing part of claim 1 enclosed characteristics. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen. Further embodiments result from the dependent claims.

Ausführungsbeispiele der Erfindung werden anhand der Zeich nungen erläutert. Embodiments of the invention will be explained with reference to the drawing voltages.

Es zeigen: Show it:

Fig. 1 das vordere Ende des Katheters, Fig. 1, the front end of the catheter,

Fig. 2 ein Beispiel für die magnetische Steuerung des Katheters und Fig. 2 shows an example of the magnetic control of the catheter and

Fig. 3 eine Anordnung mit vier Steuermagneten. Fig. 3 shows an arrangement with four control magnet.

Im vorderen Ende des Katheters ( Fig. 1), der aus einem weich flexiblen Schlauch 1 aus Kunststoff besteht, ist ein kurzer zylinderförmiger Führungsmagnet 2 hoher permeabilität befestigt. In the front end of the catheter (Fig. 1), which consists of a soft flexible tube 1 of plastic, a short cylindrical guide magnet 2 is mounted high permeability. Als besonders geeignet hat sich ein Samarium-Cobalt-Magnet er wiesen, der beispielsweise bei einem Durchmesser von 1 bis 2 mm eine Länge von 7 bis 10 mm aufweisen kann. Particularly suitable is a samarium cobalt magnet has he reported, which may have a length of 7 to 10 mm for example with a diameter of 1 to 2 mm. Der Durchmesser des Führungsmagneten 2 wird zweckmäßigerweise an den Innendurch messer des Katheterschlauches 1 angepaßt. The diameter of the guide magnet 2 is expediently adapted to the internal diameter of the catheter tube. 1 Zur sicheren Führung und Ausrichtung des Endes des Katheters soll dieser Bereich des Schlauches besonders flexibel ausgebildet sein, damit der kleine Führungsmagnet 2 sich in die Richtung der Kraftlinien des von Hand geführten Steuermagneten 3 ( Fig. 2) einstellen kann. For safe guidance and alignment of the end of the catheter of this region of the tube should be designed to be particularly flexible so that the little guide magnet 2 in the direction of the lines of force of the manually-guided control magnet 3 (Fig. 2) can be established. Durch eine geschickte Handhabung des Steuermagneten läßt sich das vordere Ende des Führungsmagneten 2 so ausrichten, daß der Katheter beim Vorschieben den gewünschten Weg zurücklegt. By a skillful manipulation of the control magnet, the front end of the guide magnet 2 can be aligned so that the catheter during advancement travels the desired path. Bei gleichzeitiger Beobachtung der Lage des Führungsmagneten 2 im Röntgenbild läßt sich der Weg des Katheters sehr genau be stimmen. With simultaneous monitoring of the situation of the guidance magnet 2 in the X-ray image, the path of the catheter can agree very well be. Im einfachen Fall kann als Steuermagnet 3 ein perma nenter Magnet ausreichend sein, der z. In the simple case as a control solenoid 3 a perma Nenter magnet may be sufficient, the z. B. aus zwei Einzelmagne ten 3 a und 3 b gebildet ist, die auf einer Stahlplatte 30 so be festigt sind, daß ihre Nord- und Südpole ähnlich einem Hufeisen magneten ein kräftiges nach vorn gerichtetes Magnetfeld erzeu gen. B. from two individual Magne th 3 a and 3 b is formed, which are strengthened so be on a steel plate 30 such that their north and south poles similar to a horseshoe magnet strong forwardly directed magnetic field erzeu gene.

Die Wirkung des Steuermagneten 3 auf den Führungsmagneten 2 im Ende des Katheters kann durch Einsatz von Elektromagneten we sentlich verstärkt werden, wobei durch eine geeignete Ausge staltung des Steuermagneten, z. The effect of the control magnet 3 on the guide magnet 2 in the end of the catheter can be enhanced by sentlich we use of electromagnets, by a suitable Substituted staltung of the control magnet, z. B. in Form eines U-förmigen Magneten, auf eine sorgfältige Abschirmung des Magnetfeldes auf der Rückseite geachtet werden muß. B. in the form of a U-shaped magnet, a careful attention must be paid to shielding of the magnetic field on the back. In Fig. 3 ist der Einsatz von vier elektromagnetischen Steuermagneten 5 schematisch dar gestellt. In Fig. 3, the use of four solenoid control magnet 5 is schematically made. Die vier Elektromagneten sind auf Stativen so ange ordnet, daß ihre Lage den Eckpunkten eines Tetraeders entspricht und daß das distale Ende des Katheters mit seinem Führungsmag neten 2 etwa im Mittelpunkt des Tetraeders zu liegen kommt. The four electromagnets are arranged so attached on tripods that their position corresponds to the vertices of a tetrahedron, and that the distal end of the catheter with its Neten Führungsmag 2 comes to lie approximately at the center of the tetrahedron. Durch einen Steuerhebel 6 (Joystick) lassen sich die Stärken der Magnetfelder der einzelnen Steuermagnete 5 über ein Steuer gerät 7 individuell einstellen, wodurch eine gezielte Ausrich tung und Bewegung des kleinen Führungsmagneten 2 erfolgt. By a control lever 6 (joystick), the strengths of the magnetic fields of the individual control magnets 5 can via a control unit 7 individually set, whereby a targeted Reg tung occurs and movement of the small guiding magnet. 2 Im Falle des Einsatzes als Herzkatheter kann es vorteilhaft sein, wenn die vom Steuergerät 7 gelieferten Gleichströme für die Steuermagnete 5 EKG-getriggert sind. In the case of use as a cardiac catheter, it may be advantageous if the delivered by the control device 7 DC currents for the control magnets 5 are triggered ECG.

Zur Entnahme von Körperflüssigkeiten, wie z. For withdrawing body fluids such. B. Blut oder zur Zuführung von Flüssigkeiten, Medikamenten oder Kontrastmitteln besitzt der Katheter in der unmittelbaren Nähe des Führungs magneten mehrere feine Löcher 4 . As blood or for feeding of liquids, drugs or contrast agents has the catheter in the immediate vicinity of the guide magnets plurality of fine holes. 4

Claims (6)

  1. 1. Katheter für diagnostische oder therapeutische Zwecke zum Einsatz in Hohlräumen und Kanälen des menschlichen Körpers insbesondere einen Herzkatheter, gekennzeichnet durch die Anordnung eines sehr kleinen Führungsmagneten ( 2 ) hoher Remanenz am distalen Endes des flexiblen Katheters und Steu erung des Katheterendes durch extrakorporal angeordnete Steuermagnete ( 3 , 5 ) . 1. catheter for diagnostic or therapeutic purposes for use in cavities and channels of the human body, in particular a cardiac catheter, characterized by the arrangement of a very small guide magnet (2) high remanence at the distal end of the flexible catheter and STEU augmentation of the catheter end by extracorporeally arranged control magnets ( 3, 5).
  2. 2. Katheter nach Anspruch 1, dadurch gekennzeichnet, daß der Führungsmagnet ( 2 ) die Form eines wenige Millimeter langen Zylinders hat. 2. A catheter according to claim 1, characterized in that the guide magnet (2) has the shape of a few millimeters long cylinder.
  3. 3. Katheter nach den Ansprüchen 1 und 2, dadurch gekennzeich net, daß die Steuermagnete ( 3 ) handgeführte Permanentmag nete sind. 3. A catheter according to claims 1 and 2, characterized in that the control magnets (3) are hand-held Permanentmag designated.
  4. 4. Katheter nach den Ansprüchen 1 und 2, dadurch gekennzeich net, daß die Steuermagnete ( 5 ) räumlich fest ausgerichtete Elektromagnete sind, deren Feldstärke über ein Steuergerät ( 7 ) mittels eines Steuerhebels ( 6 ) geregelt ist. 4. A catheter according to claims 1 and 2, characterized in that the control magnets (5) are spatially permanently aligned electromagnets, the field strength of a control device (7) by means of a control lever (6) is regulated.
  5. 5. Katheter nach einem der Ansprüche 1 bis 4, dadurch gekenn zeichnet, daß mindestens vier Steuermagnete ( 5 ) vorgesehen sind, die in den Eckpunkten eines Tetraeders angeordnet sind. 5. A catheter according to any one of claims 1 to 4, characterized in that at least four control magnets (5) are provided which are arranged in the corners of a tetrahedron.
  6. 6. Katheter nach einem der Ansprüche 1 bis 5, dadurch gekenn zeichnet, daß das Steuergerät ( 7 ) EKG-getriggert ist. 6. A catheter according to any one of claims 1 to 5, characterized in that the control device (7) is ECG-triggered.
DE19904014947 1990-05-10 1990-05-10 Flexible catheter for diagnostic or therapeutic purposes - has very small guiding magnet of high remanence at distal end and extra corporal control magnets Withdrawn DE4014947A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904014947 DE4014947A1 (en) 1990-05-10 1990-05-10 Flexible catheter for diagnostic or therapeutic purposes - has very small guiding magnet of high remanence at distal end and extra corporal control magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904014947 DE4014947A1 (en) 1990-05-10 1990-05-10 Flexible catheter for diagnostic or therapeutic purposes - has very small guiding magnet of high remanence at distal end and extra corporal control magnets

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DE4014947A1 true true DE4014947A1 (en) 1991-11-14

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425382A (en) * 1993-09-14 1995-06-20 University Of Washington Apparatus and method for locating a medical tube in the body of a patient
WO1997048438A2 (en) * 1996-06-17 1997-12-24 Lucent Medical Systems, Inc. Medical tube for insertion and detection within the body of a patient
US5843153A (en) * 1997-07-15 1998-12-01 Sulzer Intermedics Inc. Steerable endocardial lead using magnetostrictive material and a magnetic field
DE19733889A1 (en) * 1997-08-05 1999-02-11 Kadalie Clemens Themba Representation of organ systems during control and guidance of e.g. guide wires, probes, catheters and endoscopes
US5879297A (en) * 1997-05-08 1999-03-09 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
US5944023A (en) * 1995-12-07 1999-08-31 Sims Deltec, Inc. Systems and methods for determining the location of an implanted device including a magnet
EP1009312A1 (en) * 1997-08-29 2000-06-21 Stereotaxis, Inc. Method and apparatus for magnetically controlling motion direction of a mechanically pushed catheter
US6129668A (en) * 1997-05-08 2000-10-10 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
US6173715B1 (en) 1999-03-01 2001-01-16 Lucent Medical Systems, Inc. Magnetic anatomical marker and method of use
US6263230B1 (en) 1997-05-08 2001-07-17 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
EP1115327A2 (en) * 1998-08-07 2001-07-18 Stereotaxis Inc. Method and apparatus for magnetically controlling catheters in body lumens and cavities
WO2002049705A1 (en) * 2000-12-21 2002-06-27 Oxford Instruments Plc Magnetic field generating system and method
US8068648B2 (en) 2006-12-21 2011-11-29 Depuy Products, Inc. Method and system for registering a bone of a patient with a computer assisted orthopaedic surgery system
US8148978B2 (en) 2005-12-30 2012-04-03 Depuy Products, Inc. Magnetic sensor array
DE102010051684A1 (en) * 2010-11-17 2012-05-24 Follak Matthias Device for controlling movements of catheter-like tool within blood vessel of patient for treatment of e.g. cerebral stroke, has electromagnet and catheter whose spatial orientations are controlled using synchronizing control
US8862200B2 (en) 2005-12-30 2014-10-14 DePuy Synthes Products, LLC Method for determining a position of a magnetic source

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674014A (en) * 1969-10-28 1972-07-04 Astra Meditec Ab Magnetically guidable catheter-tip and method
US3794041A (en) * 1971-11-30 1974-02-26 Yeda Res & Dev Gastrointestinal catheter
US4249536A (en) * 1979-05-14 1981-02-10 Vega Roger E Urological catheter
US4671287A (en) * 1983-12-29 1987-06-09 Fiddian Green Richard G Apparatus and method for sustaining vitality of organs of the gastrointestinal tract

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674014A (en) * 1969-10-28 1972-07-04 Astra Meditec Ab Magnetically guidable catheter-tip and method
US3794041A (en) * 1971-11-30 1974-02-26 Yeda Res & Dev Gastrointestinal catheter
US4249536A (en) * 1979-05-14 1981-02-10 Vega Roger E Urological catheter
US4671287A (en) * 1983-12-29 1987-06-09 Fiddian Green Richard G Apparatus and method for sustaining vitality of organs of the gastrointestinal tract

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5622169A (en) * 1993-09-14 1997-04-22 University Of Washington Apparatus and method for locating a medical tube in the body of a patient
US5425382A (en) * 1993-09-14 1995-06-20 University Of Washington Apparatus and method for locating a medical tube in the body of a patient
US5944023A (en) * 1995-12-07 1999-08-31 Sims Deltec, Inc. Systems and methods for determining the location of an implanted device including a magnet
WO1997048438A2 (en) * 1996-06-17 1997-12-24 Lucent Medical Systems, Inc. Medical tube for insertion and detection within the body of a patient
WO1997048438A3 (en) * 1996-06-17 1998-03-19 Robert N Golden Medical tube for insertion and detection within the body of a patient
US6263230B1 (en) 1997-05-08 2001-07-17 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
US5879297A (en) * 1997-05-08 1999-03-09 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
US6129668A (en) * 1997-05-08 2000-10-10 Lucent Medical Systems, Inc. System and method to determine the location and orientation of an indwelling medical device
US5843153A (en) * 1997-07-15 1998-12-01 Sulzer Intermedics Inc. Steerable endocardial lead using magnetostrictive material and a magnetic field
DE19733889A1 (en) * 1997-08-05 1999-02-11 Kadalie Clemens Themba Representation of organ systems during control and guidance of e.g. guide wires, probes, catheters and endoscopes
EP1009312A1 (en) * 1997-08-29 2000-06-21 Stereotaxis, Inc. Method and apparatus for magnetically controlling motion direction of a mechanically pushed catheter
EP1009312A4 (en) * 1997-08-29 2001-06-20 Stereotaxis Inc Method and apparatus for magnetically controlling motion direction of a mechanically pushed catheter
EP1115327A4 (en) * 1998-08-07 2007-06-20 Stereotaxis Inc Method and apparatus for magnetically controlling catheters in body lumens and cavities
EP1115327A2 (en) * 1998-08-07 2001-07-18 Stereotaxis Inc. Method and apparatus for magnetically controlling catheters in body lumens and cavities
US6173715B1 (en) 1999-03-01 2001-01-16 Lucent Medical Systems, Inc. Magnetic anatomical marker and method of use
WO2002049705A1 (en) * 2000-12-21 2002-06-27 Oxford Instruments Plc Magnetic field generating system and method
US8148978B2 (en) 2005-12-30 2012-04-03 Depuy Products, Inc. Magnetic sensor array
US8862200B2 (en) 2005-12-30 2014-10-14 DePuy Synthes Products, LLC Method for determining a position of a magnetic source
US8068648B2 (en) 2006-12-21 2011-11-29 Depuy Products, Inc. Method and system for registering a bone of a patient with a computer assisted orthopaedic surgery system
DE102010051684A1 (en) * 2010-11-17 2012-05-24 Follak Matthias Device for controlling movements of catheter-like tool within blood vessel of patient for treatment of e.g. cerebral stroke, has electromagnet and catheter whose spatial orientations are controlled using synchronizing control

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Legal Events

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OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: RAM, WOLFGANG, DR.MED., 2300 KIEL, DE

8130 Withdrawal