EP0996475A1 - Canule a deux lumieres - Google Patents

Canule a deux lumieres

Info

Publication number
EP0996475A1
EP0996475A1 EP98941305A EP98941305A EP0996475A1 EP 0996475 A1 EP0996475 A1 EP 0996475A1 EP 98941305 A EP98941305 A EP 98941305A EP 98941305 A EP98941305 A EP 98941305A EP 0996475 A1 EP0996475 A1 EP 0996475A1
Authority
EP
European Patent Office
Prior art keywords
cannula
blood
double lumen
double
housing
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Withdrawn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
EP98941305A
Other languages
German (de)
English (en)
Inventor
Josef Magasi
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.)
MAGASI Josef
Original Assignee
Sueddeutsche Feinmechanik GmbH
Sueddeutsche Feinmechanik GmbH
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 Sueddeutsche Feinmechanik GmbH, Sueddeutsche Feinmechanik GmbH filed Critical Sueddeutsche Feinmechanik GmbH
Publication of EP0996475A1 publication Critical patent/EP0996475A1/fr
Withdrawn legal-status Critical Current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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • A61M5/1582—Double lumen needles

Definitions

  • Double lumen cannula Double lumen cannula
  • the invention relates to a double-lumen cannula with an outer cannula, which is designed as a stab incision cannula, and an inner cannula which can be displaced therein and which, in its forward position, projects beyond the outer cannula, and with two blood tubes, each of which is connected to one of the cannulas.
  • Double-lumen cannulas are used in the field of plasmapheresis or dialysis, i.e. when drawing blood and replacing parts with suitable solutions or in the artificial blood purification of kidney patients.
  • a permanent vascular access was created to draw and supply the blood by connecting an artery to a vein.
  • This vascular access is called a shunt or fistula.
  • Fresh arterial blood flows through the Nene and develops into a highly developed vessel that is easy to puncture.
  • the puncture was typically carried out by means of two puncture cannulas, an arterial stab incision cannula further away from the body being used for taking the blood and a venous stab incision cannula closer to the body for supplying the cleaned blood.
  • a double lumen cannula of the type mentioned at the outset is known, in which both cannulas are made of steel.
  • the outer cannula is equipped with a T-shaped housing, the arterial blood tube being connected to the base of the "T", the cannula tip being located at one end of the "T” and the other end being tubular.
  • the inner cannula can be inserted into this tubular end. It can be displaced in the tubular part in such a way that the front end of the inner cannula projects beyond the cannula tip or that it is withdrawn behind the cannula tip.
  • the double lumen cannula is applied in the latter position.
  • the inner cannula is then pushed into its front position.
  • the arterial blood is withdrawn through the outer cannula and the purified blood (venous blood flow) is returned through the inner cannula.
  • the inner cannula protrudes only a short distance from the outer cannula, which is due to the fact that such a steel part cannot be pushed further into the blood vessel without significantly increasing the risk of injury and the stress on the inner vein skin.
  • DE 195 35 349 A1 relates to a double-flow cannula for the treatment of gums and gums, with a washing-up liquid emerging from a rinsing cannula and being taken up again by a suction cannula surrounding it.
  • the irrigation and suction cannula are made in particular of stainless steel.
  • AI is a surgical instrument for epidural and spinal anesthesia and consists of a cannula with two needles lying one inside the other. In order to rule out injury to body tissue when inserting the needles, the needles are oriented to one another to the desired extent.
  • infusion cannula is described in the literature reference "Die Braunüle", company lettering from Braun Melsungen, 2nd revised and supplemented edition, Nov. 1994, in which an outer plastic cannula surrounds a metal cannula running in it. The inner cannula must be removed to infuse.
  • the invention is therefore based on the problem of developing a double-lumen cannula of the type mentioned in such a way that the recirculation of the blood or blood and solution and vascular damage are largely avoided.
  • the inner cannula is designed as a flexible plastic cannula, which in its front position projects so far with its front end that the outer cannula no longer has any medically significant recirculation of blood.
  • the invention was based on the knowledge that the arterial sampling point must be further away from the venous return point without the inner wall of the vein being stressed by the front edge of a metal tube.
  • the invention proposes forming the inner cannula from flexible plastic. It is thereby achieved that the inner cannula can be pushed much further into the vein, since it is not rigid, but also "seeks" the path through a curvature of the vein.
  • this flexible plastic tube also poses a much lower risk for the inner wall of the vein, since the material is softer and because this inner cannula evades by its flexibility when it hits the inner wall of the vein. This allows the inner cannula with its front end to be pushed far enough into the vein that it projects a large distance beyond the front end of the outer cannula. The distance between the arterial sampling point and the venous return point can be measured in such a way that no significant recirculation of blood takes place.
  • the double-lumen cannula has a cannula housing that forms an absolutely closed system with the blood tubes. In this way, no blood can escape in the region of the double-lumen cannula, and no contamination can get into the blood.
  • the inner cannula can be moved in the closed system.
  • a further development provides that the rear end of the inner cannula has a piston-like rim which is mounted in a cylindrical recess of the cannula housing through which blood flows back so that the back-flowing blood pushes the inner cannula forward.
  • the advantage of this embodiment is that the inner cannula is gently inserted into the vein with its front end and comes to a standstill if there is any resistance. If this is observed, for example, through a transparent housing, the inner cannula can be gently guided past the obstacle by a slight movement of the double-lumen cannula.
  • a further embodiment provides that the rear end of the inner cannula has a thickening which is mounted within a flexible wall. It is then expediently provided that the thickening is held within the flexible wall in such a way that the inner cannula can be displaced by action from outside, but not by the blood flowing back. In this way, the position of the inner cannula can be adjusted as desired.
  • the respective conditions for example a curvature in the vein, can then be taken into account.
  • the flexible wall can be the blood tube itself.
  • the thickening contains an iron core, as a result of which the inner cannula can be moved from the outside by means of a magnet.
  • the cannula housing of all embodiments can be equipped with a handle, for example with a turning handle, which allows the double-lumen cannula to be rotated and fixed in any position on the skin.
  • the cannula housing In order to be able to manufacture the cannula housing better, it can be provided that it consists of a front cannula housing and a branching piece, which are connected to one another by a coupling or in some other way.
  • the cannula housing can at least partially consist of transparent material in order to be able to better observe the positioning of the inner cannulas and the blood flow.
  • FIG. 1 shows a first example of a double lumen cannula according to the invention
  • FIG. 2 shows another embodiment of a double-lumen cannula
  • Fig. 3 an application to a vein.
  • FIG. 1 shows a first exemplary embodiment of a double-lumen cannula 1 with an outer cannula 2 and an inner cannula 3.
  • the outer cannula 2 is fixedly connected to the cannula housing 7, and the inner cannula 3 is displaceably mounted in this and in the outer cannula 2.
  • the lumen 18 of the inner cannula 3 is used for the return of cleaned, ie venous blood, and the lumen 17, which is located between the outer wall of the inner cannula 3 and the inner wall of the outer cannula 2, is used to withdraw arterial blood.
  • FIG. 1 In the cannula housing 7 there is a fork through which the lumen 17 is connected to a blood tube 4 for the arterial blood and the lumen 18 to a blood tube 5 for the venous blood.
  • the blood tubes 4 and 5 are only shown in FIG. 2, FIG. 1 only shows the connections 28 for the blood tubes, which are connected to a channel 19 for arterial blood and a channel 20 for venous blood.
  • FIG. 1b The tip of the double-lumen cannula 1 is shown in FIG. 1b, the illustration showing the removal position as explained in FIG. 3 with the aid of an application to a vein 23.
  • This front position of the inner cannula 3 shown in FIG. 1b corresponds to the position shown in FIG. 1.
  • the rear position of the inner cannula 3 is shown with broken lines, in which its front end 6 lies within the outer cannula 2 and which serves to insert the vein 23 into the vein 23. Once this puncture has taken place, the inner cannula 3 must be moved to the front so that the arterial removal site 26 is far enough from the venous return site 27.
  • this displacement is served by the piston-like edge 8, which is located within a cylindrical recess 9 of the cannula housing 7.
  • the rear part of the inner cannula 3 is drawn out in Fig.la.
  • the inner cannula 3 is displaced by means of the piston-like rim 8 by the blood flow of the venous blood in the direction of the arrow 21. As a result, the inner cannula 3 is gently pushed into the vein 25.
  • the puncture tip 16 of the outer cannula 2 is ground in a conventional manner such that the Double lumen cannula 1 can be inserted into the vein 23 with as little injury as possible.
  • the cannula housing 7 consists of a front cannula housing 13 and a branching piece 14 which are connected to one another by means of a coupling 15. In this way, the cannula housing 7 can be produced by means of, for example, simpler injection molded parts.
  • a handle anchor 12 is provided, on which a handle, for example a rotary handle, can be attached.
  • FIG. 2 shows a further exemplary embodiment of the double-lumen cannula 1.
  • the inner cannula 3 has a thickening 10, which is located within a flexible wall 11, which in the exemplary embodiment is designed as a wall of the blood tube 5.
  • the thickening 10 has such a dimension with respect to the flexible wall 11 that the thickening 10 can be displaced from the outside by finger pressure, but not by the blood flow. In this way it is possible to bring the inner cannula 3 consciously and specifically into a certain desired position.
  • conditions such as the curvature of the vein can be taken into account, for example by stopping the displacement of the inner cannula 3 in view of an obstacle and only continuing when the obstacle can be avoided by changing the position of the double-lumen cannula 1.
  • the dialysis can be carried out by means of a single puncture 24 with simultaneous blood withdrawal and blood return without any appreciable recirculation of blood. In this way, the patient's blood vessel is spared as much as possible, since only a single puncture 24 has to be made, the inner cannula 3 is inserted gently and through preventing blood recirculation the time of dialysis can be kept short.
  • Preferred dimensions of the double-lumen cannula are:
  • Inner diameter of inner cannula 0.5-1.5 mm, preferably approximately 1 mm
  • outer diameter of inner cannula 0.6-1.6 mm, preferably 1.2 mm
  • inner diameter of outer cannula 0.7-2.4 mm
  • Outer diameter outer cannula up to 2.5 mm, preferably about 1.8 mm.
  • the distance between the tips of the inner and outer cannula when the double lumen cannula is applied, i.e. when blood is drawn and supplied, should be about 5 - 30 mm, in particular 15 mm with a blood flow of about 350 ml / min and a blood pressure of 200 mmHg.

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • External Artificial Organs (AREA)

Abstract

L'invention concerne une canule à deux lumières (1) comportant une canule extérieure (2), qui est conçue comme une canule de perforation et d'incision, et une canule intérieure (3) pouvant coulisser dans celle-ci, qui, lorsqu'elle est en position avant, dépasse de la canule extérieure (2), ainsi que deux flexibles à sang (4, 5) qui sont reliés chacun à une des canules (2, 3). Une telle canule à deux lumières doit être conçue de façon que la recirculation du sang et des endommagements des vaisseaux soient évités dans une large mesure. Cet objectif est atteint par le fait que la canule intérieure (3) se présente sous la forme d'une canule en matière plastique flexible qui, lorsqu'elle est en position avant, dépasse, avec son extrémité avant (6), de la canule extérieure (2) dans une mesure telle qu'aucune recirculation notable du sang se produise encore.
EP98941305A 1997-07-08 1998-07-08 Canule a deux lumieres Withdrawn EP0996475A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997129022 DE19729022C2 (de) 1997-07-08 1997-07-08 Doppellumenkanüle
DE19729022 1997-07-08
PCT/EP1998/004246 WO1999002209A1 (fr) 1997-07-08 1998-07-08 Canule a deux lumieres

Publications (1)

Publication Number Publication Date
EP0996475A1 true EP0996475A1 (fr) 2000-05-03

Family

ID=7834929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98941305A Withdrawn EP0996475A1 (fr) 1997-07-08 1998-07-08 Canule a deux lumieres

Country Status (7)

Country Link
EP (1) EP0996475A1 (fr)
JP (1) JP2001509425A (fr)
AU (1) AU8974198A (fr)
BR (1) BR9810690A (fr)
DE (1) DE19729022C2 (fr)
PL (1) PL338044A1 (fr)
WO (1) WO1999002209A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8092416B2 (en) 2008-03-28 2012-01-10 Vitalmex Internacional S.A. De C.V. Device and method for connecting a blood pump without trapping air bubbles
BR202021000447U2 (pt) * 2021-01-11 2022-09-13 Andre Brito Queiroz Cateter com duplo lúmen paralelo para evitar o enrosco dos fios-guias nas cirurgias endovasculares do arco aórtico

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920013A (en) * 1975-01-06 1975-11-18 Jason H Bodzin Subclavian vena puncture devices
DE2613281C2 (de) * 1976-03-29 1984-12-20 Günter van Dr.med. 4000 Düsseldorf Endert Doppellumenkatheter
CA1114705A (fr) * 1977-08-04 1981-12-22 Robert H. Johnson Canule permettant l'ecoulement du sang dans deux directions et methode d'utilisation
GB2032778A (en) * 1978-10-12 1980-05-14 Avon Medicals Fistula needle
DE3327585A1 (de) * 1982-08-06 1984-02-09 John Martin Oxford Evans Chirurgisches instrument fuer die epidurale und spinale anaesthesie
HU210728B (en) * 1991-09-12 1995-07-28 Bottlik Needle for piloting of a catheter through the skin in closed structure
DE19535349C2 (de) * 1995-09-22 1998-01-29 Uwe Ahrendt Doppelstromkanüle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9902209A1 *

Also Published As

Publication number Publication date
BR9810690A (pt) 2000-09-05
DE19729022C2 (de) 1999-07-22
PL338044A1 (en) 2000-09-25
DE19729022A1 (de) 1999-02-18
WO1999002209A1 (fr) 1999-01-21
JP2001509425A (ja) 2001-07-24
AU8974198A (en) 1999-02-08

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