WO1983000631A1 - Mandrin for catheter - Google Patents

Mandrin for catheter Download PDF

Info

Publication number
WO1983000631A1
WO1983000631A1 PCT/DE1979/000032 DE7900032W WO8300631A1 WO 1983000631 A1 WO1983000631 A1 WO 1983000631A1 DE 7900032 W DE7900032 W DE 7900032W WO 8300631 A1 WO8300631 A1 WO 8300631A1
Authority
WO
WIPO (PCT)
Prior art keywords
wires
stylet
plastic
strand
plastic strand
Prior art date
Application number
PCT/DE1979/000032
Other languages
German (de)
French (fr)
Inventor
Gerd Krick
Original Assignee
Gerd Krick
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 Gerd Krick filed Critical Gerd Krick
Publication of WO1983000631A1 publication Critical patent/WO1983000631A1/en

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
    • A61M25/0102—Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
    • 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
    • A61M25/0043—Catheters; Hollow probes characterised by structural features
    • A61M2025/0063—Catheters; Hollow probes characterised by structural features having means, e.g. stylets, mandrils, rods or wires to reinforce or adjust temporarily the stiffness, column strength or pushability of catheters which are already inserted into the human body

Definitions

  • the invention relates to a stylet for catheters, consisting of a plastic strand with a wire insert that is circular in cross section.
  • Another known stylet for venous catheters for example, consists of a plastic strand provided with an X-ray contrast strip. Furthermore, a stylet of the type specified at the outset is known, in which a wire forms the core of the plastic strand and which is produced by the plastic being extrudate around the wire.
  • the flexibility of these well-known stylets mainly depends on the type of plastic material, whose flexibility and elasticity are known to vary in large tolerance ranges.
  • the object of the present invention is therefore to create a stylet whose rigidity, flexibility and elasticity can be reduced within narrow limits.
  • this object is achieved in that a plurality of wires with a round cross-section at a distance from each other in the upper surface of the strand made of a soft plastic and left by this are bordered over half of their cross-sections.
  • a very soft plastic is used, which essentially serves only as a filling material, so that its stiffness, flexibility and restoring force are mainly determined by the metal wire.
  • the flexibility and elasticity of the stylet are no longer dependent on the properties of the plastic used, which are difficult to reproduce from batch to batch with the required accuracy. Since the wires give the stylet the required flexibility and elasticity, a very soft plastic can be used, the hardness of which no longer needs to be adjusted within narrow limits.
  • the stylet according to the invention is therefore characterized by a more uniform elasticity and flexibility, which better meet the requirements of practice.
  • the stylet according to the invention can also be easily pushed into the catheter tube, since the wire, with its cross-section, roughly crescent-shaped, protrudes over the surface of the plastic strand Support elevations against the inner wall of the catheter and form guides.
  • the more, linear contact of the stylet with the catheter reduces the friction between the two, which is particularly important for pulling out the stylet so that there is no displacement of the inserted catheter.
  • Wires give this a good elasticity, so that the man in it after being deflected by an obstacle as a result of it;
  • the wires can run ver in the axial direction of the plastic strand or surround it in a helical shape. If the wires run helically over the surface of the plastic strand, the stylet and thus the catheter can follow the curves and radii of the laying path particularly easily.
  • Fig. 1 section and a longitudinal section through a stylet
  • Dar mandrin consists of a strand 2 of round cross-section made of a soft plastic, over the surface of which four wires 1 extend at the same distance from one another in the axial direction.
  • the wires 1 are so far embedded in the surface of the plastic strand 2 that they protrude only about a third. The wires are thus securely held in the plastic strand.
  • the wires are very thin in relation to the cross section of the plastic strand and are dimensioned such that they give the stylet the required flexibility and elasticity.
  • the wires are preferably made of a stainless steel.
  • the wires are extruded with the plastic strand or pressed into it immediately after the extrusion.

Abstract

The mandrin for a catheter is comprised of a plurality of wires (1), having a circular cross-section and arranged at a distance from each other and half-embedded at the surface of a flexible plastic strand (2). Said construction provides the mandrin with a rigidity, a flexibility and an elasticity which may be reproduced precisely.

Description

Mandrin für Katheter Stylet for catheters
Die Erfindung betrifft einen Mandrin für Katheter, bestehend aus einem im Querschnitt kreisförmigen Kunststoffsträng mit Drahteinlage.The invention relates to a stylet for catheters, consisting of a plastic strand with a wire insert that is circular in cross section.
Aus der US-PS 39 73 556 ist ein aus einer Schraubenfeder bestehender Mandrin init einer Drahtseele bekannt, dessen Windungen auf der Außenseite teilweise abgeschliffen oder mit einem Überzug aus Kunststoff versehen sein können. Dieser bekannte Katheter weist ein erhebliches Gewicht auf und ist wegen seines komplizierten Aufbaus kostspielig.From US-PS 39 73 556 a mandrel consisting of a helical spring with a wire core is known, the windings of which can be partially ground on the outside or provided with a plastic coating. This known catheter has a considerable weight and is expensive because of its complicated structure.
Ein anderer bekannter Mandrin für beispielsweise Venenkatheter besteht aus einem mit einem Röntgenkontraststreifen versehenen Kunststoffsträng. Weiterhin ist ein Mandrin der eingangs angegebenen Art bekannt, bei dem ein Draht die Seele des Kunststoffstrangs bildet und der dadurch hergestellt wird, da3 der Kunststoff um den Draht herum extrudiart wird. Die Flexibilität dieser bekannten Mandrins hängt überwiegend von der Art des Kunststoffmaterials ab dessen Schmiegsamkeit und Elastizität bekannterweise in große ren Toleranzbereichen variiert.Another known stylet for venous catheters, for example, consists of a plastic strand provided with an X-ray contrast strip. Furthermore, a stylet of the type specified at the outset is known, in which a wire forms the core of the plastic strand and which is produced by the plastic being extrudate around the wire. The flexibility of these well-known stylets mainly depends on the type of plastic material, whose flexibility and elasticity are known to vary in large tolerance ranges.
Aufgabe der vorliegenden Erfindung ist es daher, einen Mandrin zu schaffen, dessen Steifigkeit, Flexibilität und Elastizität sich in engen Grenzen reprodurieren läßt.The object of the present invention is therefore to create a stylet whose rigidity, flexibility and elasticity can be reduced within narrow limits.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß mehrere Drähte mit rundem Querschnitt im Abstand voneinander in die Ober fläche des aus einem weichen Kunststoff bestehenden Strangs ein gelassen und von diesem bis über die Hälfte ihrer Querschnitte eingefaßt sind. Bei dem erfindungsgemäßen Mandrin wird ein sehr weicher Kunststoff verwendet, der im wesentlichen lediglich als Füllmaterial dient, so daß dessen Steifigkait, Flexibilität und Rückstellkraft überwiegend von dem Metalldraht bestimmt werden. Dia Flexibilität und Elastizität des Mandrins sind also nicht mehr von den Eigenschaften des verwendeten Kunststoffs abhängig, die sich von Charge zu Charge nur schwer mit dar erforderlichen Genauigkeit reproduzieren lassen. Da die Drähte dem Mandrin die erforderliche Flexibilität und Elastizität verleihen, Kann einsehr weicher Kunststoff verwendet werden, dessen Härte nicht mehr in engen Grenzen eingestellt zu werden braucht. Der erfin dungsgemäße Mandrin zeichnet sich daher durch eine gleichmäßigere Elastizität und Flexibilität aus, die den Erfordernissen der Praxis besser gerecht werden.According to the invention this object is achieved in that a plurality of wires with a round cross-section at a distance from each other in the upper surface of the strand made of a soft plastic and left by this are bordered over half of their cross-sections. In the stylet according to the invention, a very soft plastic is used, which essentially serves only as a filling material, so that its stiffness, flexibility and restoring force are mainly determined by the metal wire. The flexibility and elasticity of the stylet are no longer dependent on the properties of the plastic used, which are difficult to reproduce from batch to batch with the required accuracy. Since the wires give the stylet the required flexibility and elasticity, a very soft plastic can be used, the hardness of which no longer needs to be adjusted within narrow limits. The stylet according to the invention is therefore characterized by a more uniform elasticity and flexibility, which better meet the requirements of practice.
Dar erfindungsgemäße Mandrin läßt sich in Katheterschlauch auch leichtar varschieben, da sich die Drähce mit ihren die Oberfläche des Kunststoffstrangs im Querschnitt etwa sichelförmig überragender Erhebungen gegen die Innenwandung des Katheters abstützen und Führungen bilden. Die mehr, linienförmige Berührung des Mandrins mit dem Katheter setzt die Reibung zwischen, beiden herab, was insbesondere für das Herausziehen des Mandrins von Bedeutung ist, damit sich keine Verlagerung des eingeführten Katheters einstellt. Die über die Oberfläche des Mandrins verlaufenden.The stylet according to the invention can also be easily pushed into the catheter tube, since the wire, with its cross-section, roughly crescent-shaped, protrudes over the surface of the plastic strand Support elevations against the inner wall of the catheter and form guides. The more, linear contact of the stylet with the catheter reduces the friction between the two, which is particularly important for pulling out the stylet so that there is no displacement of the inserted catheter. The ones running over the surface of the stylet.
Drähte verleihen diesem eine gute Elastizität, so daß der Man drin nach einem Auslenken durch ein Hindernis infolge seiner;Wires give this a good elasticity, so that the man in it after being deflected by an obstacle as a result of it;
Rückstellkraft wieder in seine Ausgangslage zurückstrsbt. Kathe ter lassen sich daher mit dem erfindungsgamäßen Mandrin leich ter verlegen. Die Drähte können in axialer Richtung des Kunststoffstrangs ver laufen oder diesen auch wendeiförmig einfassen. Verlaufen die Drähte wendeiförmig über die Oberfläche des KunststoffStrangs, kann der Mandrin und damit der Katheter besonders leicht dan Krümmungen und Radien des Verlegeweges folgen.Restoring force returns to its original position. Kathe ter are therefore easier to lay with the inventive styling. The wires can run ver in the axial direction of the plastic strand or surround it in a helical shape. If the wires run helically over the surface of the plastic strand, the stylet and thus the catheter can follow the curves and radii of the laying path particularly easily.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den ünteransprüchen näher beschrieben worden.Further advantageous embodiments of the invention have been described in more detail in the subordinate claims.
Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigtAn embodiment of the invention is explained below with reference to the drawing. In this shows
Fig. 1 einen Längsschnitt durch einen Mandrin abschnitt undFig. 1 section and a longitudinal section through a stylet
Fig. 2. einen Querschnitt durch den Mandrin nach Fig. 1.2. a cross section through the stylet according to FIG. 1.
Dar Mandrin besteht aus einem im Querschnitt runden Strang 2 aus einem weichen Kunststoff, über dessen Oberfläche in gleichem Abstand voneinander in axialer Richtung vier Drähte 1 verlaufen. Die Drähte 1 sind so weit in die Oberfläche des Kunststoffstrangs 2 eingelassen, daß sie diesen nur etwa zu einem Drittel überragen. Die Drähte sind damit sicher in dem Kunststoffsträng gehaltert.Dar mandrin consists of a strand 2 of round cross-section made of a soft plastic, over the surface of which four wires 1 extend at the same distance from one another in the axial direction. The wires 1 are so far embedded in the surface of the plastic strand 2 that they protrude only about a third. The wires are thus securely held in the plastic strand.
Die Drähte sind im Verhältnis zum Querschnitt des Kunststoffstrangs sehr dünn und so bemessen, daß sie dem Mandrin die erforderliche Flexibilität und Elastizität verleihen.The wires are very thin in relation to the cross section of the plastic strand and are dimensioned such that they give the stylet the required flexibility and elasticity.
Die Drähte bestehen vorzugsweise aus einem nicht rostenden Stahl.The wires are preferably made of a stainless steel.
Zur Herstellung des Mandrins werden die Drähte mit dem Kunststoffsträng extrudiert oder unmittelbar nach dem Extrudieren in diesen eingedrückt. To produce the stylet, the wires are extruded with the plastic strand or pressed into it immediately after the extrusion.

Claims

Patentansprüche: Claims:
1. Mandrin für Katheter, bestehend aus einem im Querschnitt kreisförmigen Kunststoffsträng mit Drahteiniage, dadurch gekennzeichnet, daß mehrere Drähte (1) mit rundem Querschnitt im Abstand voneinander in die Oberfläche des aus einem weichen Kunststoff bestehenden Strangs (2) eingelassen und von diesem bis über die Hälfte ihrer Querschnitte eingefaßt sind.1. stylet for catheters, consisting of a circular cross-section of plastic strand with wire insert, characterized in that several wires (1) with a round cross-section spaced from each other in the surface of the strand made of a soft plastic (2) and from this to over half of their cross sections are edged.
2. Mandrin nach Anspruch 1, dadurch gekennazeichnet, daß die Drähte (1) in axialer Richtung des Kunststoffstrangs (2) verlaufen.2. stylet according to claim 1, characterized in that the wires (1) extend in the axial direction of the plastic strand (2).
3. Mandrin nach Anspruch 1, dadurch gekennzeichnet, daß die Drähte den Kunststoffsträng (2) wendeiförmig einfassen.3. stylet according to claim 1, characterized in that the wires surround the plastic strand (2) helically.
4. Mandrin nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Aussteifung des Kunststoffstrangs (2) drei bis vier Drähte (1) über dessen Oberfläche verlaufen, 4. stylet according to any one of claims 1 to 3, characterized in that three to four wires (1) extend over the surface thereof to stiffen the plastic strand (2),
5. Mandrin nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Drähte (1) gleichen Abstand voneinander aufweisen.5. stylet according to one of claims 1 to 4, characterized in that the wires (1) have the same distance from each other.
6. Mandrin nach einem der Ansprüche 1 bis 5, dadurch gekenn zeichnet, daß der Kunststoffsträng (2) die Drähte (1) etw zu zwei Drittel ihrer Querschnitte einfaßt. 6. stylet according to one of claims 1 to 5, characterized in that the plastic strand (2) surrounds the wires (1) somewhat to two thirds of their cross sections.
PCT/DE1979/000032 1978-03-28 1979-03-28 Mandrin for catheter WO1983000631A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP2813276.5780328 1978-03-28
DE2813276A DE2813276C2 (en) 1978-03-28 1978-03-28 Stylet for catheters

Publications (1)

Publication Number Publication Date
WO1983000631A1 true WO1983000631A1 (en) 1983-03-03

Family

ID=6035552

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1979/000032 WO1983000631A1 (en) 1978-03-28 1979-03-28 Mandrin for catheter

Country Status (6)

Country Link
US (1) US4362163A (en)
JP (1) JPS54133780A (en)
DE (1) DE2813276C2 (en)
FR (1) FR2420978A1 (en)
GB (1) GB2017182B (en)
WO (1) WO1983000631A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132694A2 (en) * 1983-08-02 1985-02-13 B. Braun-SSC AG Set of catheter or cannula and mandrel
EP0238952A2 (en) * 1986-03-27 1987-09-30 Pfrimmer-Viggo GmbH + Co. KG Catheter for percutaneous gastrotomy
EP0611073A1 (en) * 1993-02-09 1994-08-17 C.R. Bard, Inc. Guidewire with round forming wire

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DE2813276C2 (en) * 1978-03-28 1985-10-03 Dr. Eduard Fresenius, Chemisch-pharmazeutische Industrie KG Apparatebau KG, 6380 Bad Homburg Stylet for catheters
US4559046A (en) * 1979-08-20 1985-12-17 Catheter Technology Corporation Apparatus for intravenous therapy and hyperalimentation
DE8132839U1 (en) * 1981-11-10 1982-03-11 B. Braun Melsungen Ag, 3508 Melsungen REINFORCING CORE FOR A CATHETER TUBE
US4457301A (en) * 1982-06-18 1984-07-03 Howmedica Inc. Intramedullary fixation device
DE3336046A1 (en) * 1983-10-04 1985-05-02 Peter Dr. März Guide mandrin for catheters and such like instruments, and a method for the production thereof
DE3336045A1 (en) * 1983-10-04 1985-05-02 Peter Dr. März Guide mandrin for catheters and similar instruments, and a method for the production thereof
US4634432A (en) * 1985-05-13 1987-01-06 Nuri Kocak Introducer sheath assembly
US4834709A (en) * 1986-03-26 1989-05-30 Sherwood Medical Company Preformable catheter
US4867174A (en) * 1987-11-18 1989-09-19 Baxter Travenol Laboratories, Inc. Guidewire for medical use
EP0382974A1 (en) * 1989-01-23 1990-08-22 C.R. Bard, Inc. Braided guide wire and method for the use thereof
JP2631320B2 (en) * 1989-10-27 1997-07-16 テルモ株式会社 catheter
US5003918A (en) * 1989-12-28 1991-04-02 Interventional Technologies, Inc. Apparatus for manufacturing atherectomy torque tubes
US5184627A (en) * 1991-01-18 1993-02-09 Boston Scientific Corporation Infusion guidewire including proximal stiffening sheath
US5295493A (en) * 1992-03-19 1994-03-22 Interventional Technologies, Inc. Anatomical guide wire
DE4302693C2 (en) * 1993-02-01 1995-06-08 Eilentropp Kg Guide wire, in particular for medical purposes
US5404887A (en) * 1993-11-04 1995-04-11 Scimed Life Systems, Inc. Guide wire having an unsmooth exterior surface
CA2222579A1 (en) * 1995-06-01 1996-12-05 Scimed Life Systems, Inc. Flow assisted catheter
US5685841A (en) * 1995-08-14 1997-11-11 Mackool; Richard J. Support for fluid infusion tube for use during eye surgery
US5776115A (en) * 1996-01-17 1998-07-07 Becton Dickinson And Company Catheter having a gear-shaped lumen to avert the elimination of fluid flow therein
US5713867A (en) * 1996-04-29 1998-02-03 Medtronic, Inc. Introducer system having kink resistant splittable sheath
US5899892A (en) * 1996-05-31 1999-05-04 Scimed Life Systems, Inc. Catheter having distal fiber braid
US6447484B1 (en) * 1997-01-09 2002-09-10 Medtronic, Inc. Flexible disc obturator for a cannula assembly
US6709418B1 (en) * 1997-07-11 2004-03-23 A-Med Systems, Inc. Apparatus and methods for entering cavities of the body
DE29718991U1 (en) * 1997-10-24 1998-11-05 Fresenius Ag Feeding tube for feeding a nutrient solution
JP2002518106A (en) * 1998-06-19 2002-06-25 エイ−メド システムズ， インコーポレイテッド Apparatus and method for entering a body cavity
US6165158A (en) * 1998-10-14 2000-12-26 Advanced Cardiovascular Systems, Inc. Lubricious catheter shaft
US6193705B1 (en) 1998-10-28 2001-02-27 Scimed Life Systems, Inc. Flow assisted catheter
EP1620159B1 (en) 2003-04-14 2009-08-05 Cook Incorporated Large diameter delivery catheter/sheath
ATE378085T1 (en) 2003-04-28 2007-11-15 Cook Inc FLEXIBLE INTRODUCER WITH DIFFERENT DUROMETER
US7771369B2 (en) * 2003-12-05 2010-08-10 Boston Scientific Scimed, Inc. Guide catheter with removable support
JP6304713B2 (en) 2015-03-10 2018-04-04 朝日インテック株式会社 Balloon catheter
JP6342843B2 (en) 2015-05-01 2018-06-13 朝日インテック株式会社 Balloon catheter

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US3169528A (en) * 1963-05-24 1965-02-16 Iii Francis S Knox Coronary sinus sucker
DE1274275B (en) * 1964-04-06 1968-08-01 Sklar Mfg Co J Surgical probe
US3731671A (en) * 1971-10-21 1973-05-08 Cordis Corp Low-friction catheter guide
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US3777761A (en) * 1972-07-18 1973-12-11 D Sheridan Post operative drainage tubes with suture strip and method of use
US3973556A (en) * 1975-06-20 1976-08-10 Lake Region Manufacturing Company, Inc. Smoothened coil spring wire guide
DE2813276C2 (en) * 1978-03-28 1985-10-03 Dr. Eduard Fresenius, Chemisch-pharmazeutische Industrie KG Apparatebau KG, 6380 Bad Homburg Stylet for catheters
US4257421A (en) * 1979-01-10 1981-03-24 Health Development Corporation Gastro-intestinal tube guide and stiffener

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169528A (en) * 1963-05-24 1965-02-16 Iii Francis S Knox Coronary sinus sucker
DE1274275B (en) * 1964-04-06 1968-08-01 Sklar Mfg Co J Surgical probe
GB1316560A (en) * 1969-04-07 1973-05-09 Sheridan D S X-ray marked medico-surgical tubes
US3731671A (en) * 1971-10-21 1973-05-08 Cordis Corp Low-friction catheter guide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132694A2 (en) * 1983-08-02 1985-02-13 B. Braun-SSC AG Set of catheter or cannula and mandrel
EP0132694A3 (en) * 1983-08-02 1985-03-13 Intermedicat Gmbh Mandrel for catheters and cannulas
EP0238952A2 (en) * 1986-03-27 1987-09-30 Pfrimmer-Viggo GmbH + Co. KG Catheter for percutaneous gastrotomy
EP0238952A3 (en) * 1986-03-27 1988-05-18 Pfrimmer-Viggo Gmbh + Co. Kg Catheter for percutaneous gastrotomy
EP0611073A1 (en) * 1993-02-09 1994-08-17 C.R. Bard, Inc. Guidewire with round forming wire

Also Published As

Publication number Publication date
DE2813276A1 (en) 1979-10-11
JPS54133780A (en) 1979-10-17
FR2420978A1 (en) 1979-10-26
GB2017182A (en) 1979-10-03
GB2017182B (en) 1982-03-31
DE2813276C2 (en) 1985-10-03
US4362163A (en) 1982-12-07
FR2420978B1 (en) 1981-03-20

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