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 DE4014947A DE4014947A DE4014947A1 DE 4014947 A1 DE4014947 A1 DE 4014947A1 DE 4014947 A DE4014947 A DE 4014947A DE 4014947 A DE4014947 A DE 4014947A DE 4014947 A1 DE4014947 A1 DE 4014947A1
Authority
DE
Germany
Prior art keywords
catheter
control
magnets
distal end
magnet
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Withdrawn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
DE4014947A
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
Application filed by Wolfgang Dr Med Ram filed Critical Wolfgang Dr Med Ram
Priority to DE4014947A priority Critical patent/DE4014947A1/en
Publication of DE4014947A1 publication Critical patent/DE4014947A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0127—Magnetic means; Magnetic markers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/70—Manipulators specially adapted for use in surgery
    • A61B34/73—Manipulators for magnetic surgery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/346—Analysis of electrocardiograms
    • A61B5/349—Detecting specific parameters of the electrocardiograph cycle
    • A61B5/352—Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval

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, especially 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. B. Blutgefäße des menschlichen Körpers, einen Führungsdraht er­ fordern (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. Besondere Schwierigkeiten ergeben sich bei der Katheterisierung des Herzens.The catheters used in the medical field are hollow flexible hoses made of plastic, because of their flexi bility when inserted into the cavities or channels, for. B. Blood vessels of the human body, a guidewire request (DBP 34 47 642). By special design of the end of the guidewire can the distal end of the catheter Introducing can only be directed within certain limits. Special 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. Die gestellte Aufgabe wird durch einen Katheter mit den im Kennzeichen des Patentanspruchs 1 angege­ benen Merkmalen gelöst. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen.
The invention is therefore based on the object of describing a new catheter which permits better guiding of the distal end of the catheter and, above all, permits insertion and placement of the catheter with a lower risk. The object is achieved by a catheter with the features specified in the characterizing part of patent claim 1. Further refinements result from the subclaims.

Ausführungsbeispiele der Erfindung werden anhand der Zeich­ nungen erläutert.Embodiments of the invention are based on the drawing explained.

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 magnets.

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. 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. Der Durchmesser des Führungsmagneten 2 wird zweckmäßigerweise an den Innendurch­ messer des Katheterschlauches 1 angepaßt. 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. 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. Bei gleichzeitiger Beobachtung der Lage des Führungsmagneten 2 im Röntgenbild läßt sich der Weg des Katheters sehr genau be­ stimmen. Im einfachen Fall kann als Steuermagnet 3 ein perma­ nenter Magnet ausreichend sein, der z. B. aus zwei Einzelmagne­ ten 3a und 3b 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.In the front end of the catheter ( Fig. 1), which consists of a soft flexible tube 1 made of plastic, a short cylindrical guide magnet 2 with high permeability is attached. A samarium-cobalt magnet has proven particularly suitable and can have a length of 7 to 10 mm, for example with a diameter of 1 to 2 mm. The diameter of the guide magnet 2 is expediently adapted to the inside diameter of the catheter tube 1 . For safe guidance and alignment of the end of the catheter, this area should be particularly flexible design of the tube so that the small guide magnet 2 is of the manually-guided control magnet can set 3 (Fig. 2) in the direction of the lines of force. By skillful handling of the control magnet, the front end of the guide magnet 2 can be aligned so that the catheter travels the desired path when advancing. With simultaneous observation of the position of the guide magnet 2 in the X-ray image, the path of the catheter can be determined very accurately. In a simple case, a permanent magnet may be sufficient as the control magnet 3 , the z. B. from two Einzelmagne ten 3 a and 3 b is formed, which are fastened on a steel plate 30 so that their north and south poles like a horseshoe magnet generate a strong forward magnetic field.

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. B. in Form eines U-förmigen Magneten, auf eine sorgfältige Abschirmung des Magnetfeldes auf der Rückseite geachtet werden muß. In Fig. 3 ist der Einsatz von vier elektromagnetischen Steuermagneten 5 schematisch dar­ gestellt. 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. 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. Im Falle des Einsatzes als Herzkatheter kann es vorteilhaft sein, wenn die vom Steuergerät 7 gelieferten Gleichströme für die Steuermagnete 5 EKG-getriggert sind.The effect of the control magnet 3 on the guide magnet 2 in the end of the catheter can be significantly increased by using electromagnets, with a suitable configuration of the control magnet, for. B. in the form of a U-shaped magnet, care must be taken to carefully shield the magnetic field on the back. In Fig. 3, the use of four electromagnetic control magnets 5 is shown schematically. The four electromagnets are arranged on tripods so that their position corresponds to the corner points of a tetrahedron and that the distal end of the catheter with its guide magnet 2 comes to lie approximately in the center of the tetrahedron. By means of a control lever 6 (joystick), the strengths of the magnetic fields of the individual control magnets 5 can be individually adjusted via a control device 7 , whereby a targeted alignment and movement of the small guide magnet 2 takes place. In the case of use as a cardiac catheter, it can be advantageous if the direct currents supplied by the control device 7 for the control magnets 5 are EKG-triggered.

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

Claims (6)

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 ) with high remanence at the distal end of the flexible catheter and control of the catheter end by extracorporeally arranged control magnets ( 3 , 5 ). 2. Katheter nach Anspruch 1, dadurch gekennzeichnet, daß der Führungsmagnet (2) die Form eines wenige Millimeter langen Zylinders hat.2. Catheter according to claim 1, characterized in that the guide magnet ( 2 ) has the shape of a few millimeters long cylinder. 3. Katheter nach den Ansprüchen 1 und 2, dadurch gekennzeich­ net, daß die Steuermagnete (3) handgeführte Permanentmag­ nete sind.3. Catheter according to claims 1 and 2, characterized in that the control magnets ( 3 ) are hand-held permanent magnets. 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. Catheter according to claims 1 and 2, characterized in that the control magnets ( 5 ) are spatially fixed electromagnets, the field strength of which is regulated by a control device ( 7 ) by means of a control lever ( 6 ). 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. Catheter according to one of claims 1 to 4, characterized in that at least four control magnets ( 5 ) are provided, which are arranged in the corner points of a tetrahedron. 6. Katheter nach einem der Ansprüche 1 bis 5, dadurch gekenn­ zeichnet, daß das Steuergerät (7) EKG-getriggert ist.6. Catheter according to one of claims 1 to 5, characterized in that the control device ( 7 ) is EKG-triggered.
DE4014947A 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
DE4014947A 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
DE4014947A 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 DE4014947A1 (en) 1991-11-14

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Cited By (17)

* 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
CN110694165A (en) * 2018-07-09 2020-01-17 唐彬秩 Neonate PICC catheter that is fixed a position and is directed under direct-view

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 (23)

* 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 Lucent Medical Systems Inc Medical tube for insertion and detection within the body of a patient
AU735276B2 (en) * 1996-06-17 2001-07-05 Lucent Medical Systems, Inc. Medical tube for insertion and detection within the body of a patient
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
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
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
DE102010051684B4 (en) 2010-11-17 2022-11-10 Follak Matthias Magnet-assisted navigation system for vascular catheterization
CN110694165A (en) * 2018-07-09 2020-01-17 唐彬秩 Neonate PICC catheter that is fixed a position and is directed under direct-view

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Legal Events

Date Code Title Description
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