FR2587901A1 - Device intended to stop the circulation of thrombi in vessels - Google Patents

Device intended to stop the circulation of thrombi in vessels Download PDF

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Publication number
FR2587901A1
FR2587901A1 FR8514394A FR8514394A FR2587901A1 FR 2587901 A1 FR2587901 A1 FR 2587901A1 FR 8514394 A FR8514394 A FR 8514394A FR 8514394 A FR8514394 A FR 8514394A FR 2587901 A1 FR2587901 A1 FR 2587901A1
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branches
axis
central axis
central
curved
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FR8514394A
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French (fr)
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Individual
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Individual
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Priority to FR8514394A priority Critical patent/FR2587901A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/01—Filters implantable into blood vessels
    • A61F2/0105—Open ended, i.e. legs gathered only at one side
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/01—Filters implantable into blood vessels
    • A61F2002/016—Filters implantable into blood vessels made from wire-like elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/005—Rosette-shaped, e.g. star-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0073—Quadric-shaped
    • A61F2230/008—Quadric-shaped paraboloidal

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  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The subject of the invention is a device intended to stop the circulation of thrombi in vessels, of the type comprising elastic branches disposed regularly around a central axis and at least the end of some of which is fitted with hooks directed outwards for anchoring in the wall of the vessel; this device being characterised in that it comprises, on either side of a central connection body 1, and disposed regularly around a central axis 2, on the one hand, several elastic branches 3, 4a, 4b, 4c, 4d each consisting of a curved strand, substantially parallel to the central axis at the central body, and progressively separating from this axis beyond it, at least three of these regularly distributed branches 4a, 4b, 4c, 4d being fitted at their end with a hook 5 directed outwards, and on the other hand, at least three elastic branches 6 each consisting of a curved strand, substantially parallel to the central axis at this axis and progressively separating from this axis beyond it, and whose end 7 is curved back inwards.

Description

La présente invention concerne un dispositif destiné à arrêter la circulation des thrombus dans les vaisseaux. The present invention relates to a device for stopping the circulation of thrombi in the vessels.

La première technique qui a été utilisée pour arrêter la circulation des thrombus afin d'éviter leur remontée vers le coeur consiste à effectuer un pincement de la veine cave. Cette technique nécessite toutefois une intervention chirurgicale. The first technique that has been used to stop the circulation of thrombi in order to avoid their ascent to the heart consists in pinching the vena cava. However, this technique requires surgery.

Depuis on a développé une autre technique qui consiste à introduire un filtre dans une veine. Le filtre utilisé à cet effet comporte 6 branches élastiques distribuées régulièrement autour d'un axe et dont l'extrémité est recourbée en forme de crochets. Il est introduit dans la veine par l'intermédiaire d'une sorte de cathéter dans lequel il est replié. Pour l'introduction, le patient est en position décubitus, de sorte que généralement le filtre tend à se fixer par gravité dans une position où toutes les extrémités des branches ne sont pas fixées dans la paroi de la veine. Par suite l'efficacité d'un tel dispositif n'est pas parfaite. De plus à l'état replié un tel dispositif a un diamètre relativement important (environ 8 mm) de sorte qu'il nécessite un cathéter de diamètre important et donc difficile à introduire. Since then, another technique has been developed which consists in introducing a filter into a vein. The filter used for this purpose has 6 elastic branches distributed regularly around an axis and the end of which is curved in the form of hooks. It is introduced into the vein via a kind of catheter in which it is folded. For the introduction, the patient is in the decubitus position, so that generally the filter tends to be fixed by gravity in a position where all the ends of the branches are not fixed in the wall of the vein. Consequently, the effectiveness of such a device is not perfect. In addition, in the folded state, such a device has a relatively large diameter (approximately 8 mm) so that it requires a catheter of large diameter and therefore difficult to introduce.

La présente invention vise à fournir un dispositif destiné à arrêter la circulation des thrombus dans les vaisseaux, qui puisse être mis en place aisément et qui soit sûr. The present invention aims to provide a device intended to stop the circulation of thrombi in the vessels, which can be placed easily and which is safe.

A cet effet la présente invention a pour objet un dispositif destiné à arrêter la circulation des thrombus dans les vaisseaux, du type comprenant des bandws
élastiques disposées régulièrement autour d'un axe central et dont au moins l'extrémité de certaines est munie de crochets dirigés vers l'extérieur pour l'ancrage dans la paroi des vaisseaux, ce dispositif étant caractérisé en ce qu'il comprend, de part et d'autre d'un corps central de liaison , et disposées régulièrement autour d'un.To this end the present invention relates to a device intended to stop the circulation of thrombi in the vessels, of the type comprising bandws
elastic regularly arranged around a central axis and at least the end of some of which is provided with hooks directed outward for anchoring in the wall of the vessels, this device being characterized in that it comprises, on the one hand and on the other side of a central connecting body, and regularly arranged around a.

axe central, d'un côté, plusieurs branches élastiques constituées chacune par un brin courbe, sensiblement parallèle à l'axe central au niveau du corps central et s'écartant progressivement de cet axe au-delà, au moins trois de ces branches régulièrement réparties étant munies à leur extrémité d'un crochet dirigé vers l'extérieur, et, de l'autre côté, au moins trois branches élastiques constituées chacune par un brin courbe, sensiblement parallèle à l'axe central au niveau de cet axe et s'écartant progressivement de cet axe au-delà et dont l'extrémité est recourbée vers l'intérieur.central axis, on one side, several elastic branches each consisting of a curved strand, substantially parallel to the central axis at the level of the central body and progressively deviating from this axis beyond, at least three of these branches regularly distributed being provided at their end with a hook directed towards the outside, and, on the other side, at least three elastic branches each constituted by a curved strand, substantially parallel to the central axis at this axis and s' gradually moving away from this axis beyond and the end of which is curved inward.

Ce dispositif comprend ainsi d'un côté des branches de filtration régulièrement distribuées. Certaines de ces branches régulièrement réparties (au moins trois) sont munies de crochets et servent ainsi à l'ancrage du dispositif dans la paroi du vaisseau. De l'autre côté le dispositif comprend des branches qui permettent de stabiliser sa position lors de la mise en place. This device thus comprises on one side regularly distributed filtration branches. Some of these regularly distributed branches (at least three) are provided with hooks and thus serve to anchor the device in the wall of the vessel. On the other side, the device includes branches which make it possible to stabilize its position during installation.

En outre par leur forme particulière et leur orientation par rapport au corps central, les différentes branches élastiques peuvent être ramenées au voisinage de l'axe central afin d'être introduitesdans un tube de petit diamètre utilisé pour la mise en place du dispositif. In addition, by their particular shape and their orientation relative to the central body, the various elastic branches can be brought in the vicinity of the central axis in order to be introduced into a tube of small diameter used for the installation of the device.

De plus pour diminuer encore le diamètre apparent du tube et faciliter la mise en place du dispositif, les branches munies de crochets ont avantageusement une longueur différente de façon que les crochets soient décalés le long de l'axe. On diminue ainsi le diamètre apparent et on évite que les crochets se bloquent les uns les autres en empêchant le déploiement du dispositif.In addition to further reduce the apparent diameter of the tube and facilitate the installation of the device, the branches provided with hooks advantageously have a different length so that the hooks are offset along the axis. The apparent diameter is thus reduced and the hooks are prevented from blocking each other by preventing the deployment of the device.

Dans ces conditions il est possible d'avoir un diamètre apparent ne dépassant pas trois millimètres, ce qui autorise la mise en place du dispositif à l'aide d'un cathéter de petit diamètre (par exemple de 3 mm de diamètre intérieur).Under these conditions it is possible to have an apparent diameter of not more than three millimeters, which authorizes the positioning of the device using a small diameter catheter (for example 3 mm inside diameter).

Le dispositif selon l'invention est réalisé de préférence en un métal élastique et peut être notamment en titane ou en acier inoxydable amagnétique par exemple 316 L, pour ne pas gêner un examen éventuel par imagerie RMN. Les branches peuvent être constituées par exemple par des brins d'un diamètre de 0,4 mm. Les brins peuvent être réunis au corps central par brassage, collage ou sertissage. The device according to the invention is preferably made of an elastic metal and can in particular be made of titanium or non-magnetic stainless steel, for example 316 L, so as not to hinder a possible examination by NMR imaging. The branches can be formed for example by strands with a diameter of 0.4 mm. The strands can be joined to the central body by stirring, gluing or crimping.

L'invention sera exposée ci-après plus en détail en se référant aux dessins annexés sur lesquels
la Fig. 1 est une vue en plan d'un dispositif selon l'invention,
la Fig. 2 est une vue de côté du dispositif selon la Fig. 1,
la Fig. 3 est une vue partielle en plan du dispositif de la Fig. 1 après repliement partiel.The invention will be explained below in more detail with reference to the accompanying drawings in which
Fig. 1 is a plan view of a device according to the invention,
Fig. 2 is a side view of the device according to FIG. 1,
Fig. 3 is a partial plan view of the device of FIG. 1 after partial folding.

Le dispositif représenté sur les Fig. 1 à 3 comprend un corps central 1 de forme générale cylindrique présentant un axe de symétrie 2. The device shown in Figs. 1 to 3 comprises a central body 1 of generally cylindrical shape having an axis of symmetry 2.

Sur l'un des côtés du corps central 1 sont fixés 4 branches 3 sans crochets et des branches 4a, 4b, 4c et 4d munies chacune d'un crochet à l'extrémité opposée à celle fixée au corps central 1
Les branches 3 et 4a, 4b, 4c et 4d sont formées de brins courbes ayant sensiblement la même courbure.On one side of the central body 1 are fixed 4 branches 3 without hooks and branches 4a, 4b, 4c and 4d each provided with a hook at the end opposite to that fixed to the central body 1
The branches 3 and 4a, 4b, 4c and 4d are formed of curved strands having substantially the same curvature.

Au niveau du corps central 1 les branches 3, 4a, 4b, 4c, et 4d sont sensiblement parallèles à l'axe central 2 et vont en s'écartant de cet axe au-delà.At the level of the central body 1, the branches 3, 4a, 4b, 4c, and 4d are substantially parallel to the central axis 2 and go away from this axis beyond.

Les 4 branches 3 ont une même longueur et sont disposées à 900 les unes par rapport aux autres. The 4 branches 3 have the same length and are arranged at 900 relative to each other.

Les branches 4a, 4b, 4c et 4d ont des longueurs qui diffèrent les unes des autres d'une même valeur (en l'occurence des longueurs décroissantes) et sont disposées également à 900 les unes par rapport aux autres dans des plans faisant un angle de 450 avec les plans des branches 3. The branches 4a, 4b, 4c and 4d have lengths which differ from each other by the same value (in this case decreasing lengths) and are also arranged at 900 relative to each other in planes making an angle of 450 with the plans of the branches 3.

Les crochets 5 à l'extrémité des branches 4 sont dirigés vers l'extérieur. The hooks 5 at the end of the branches 4 are directed outwards.

De l'autre côté du corps central 1 sont fixées 4 branches 6 formées chacune d'un brin courbe. Au niveau du corps central les branches 6 sont sensiblement parallèles à l'axe central 2 et vont en s'écartant au-delà, jusqu'au voisinage de leur extrémité 7, qui, par contre, est recourbée vers l'intérieur, en direction de l'axe central. On the other side of the central body 1 are fixed 4 branches 6 each formed of a curved strand. At the level of the central body, the branches 6 are substantially parallel to the central axis 2 and move away from it, up to the vicinity of their end 7, which, on the other hand, is bent inwards, in the direction of the central axis.

On a présenté sur la Fig. 3 comment le dispositif représenté sur les Fig. 1 et 2 pouvait être replié en vue de son introduction dans un conduit tel qu'un cathéter ou une aiguille. We have shown in FIG. 3 how the device shown in FIGS. 1 and 2 could be folded up for introduction into a conduit such as a catheter or needle.

Les branches 4a, 4b, 4c et 4d sont ramenées vers l'axe central 2. Les différents branches 4a à 4d ayant des longueurs différentes, les crochets 5 sont étagés le long de l'axe central 2. Les branches 3 sont repliées de même contre les branches 4a, 4b, 4c et 4d. The branches 4a, 4b, 4c and 4d are brought back towards the central axis 2. The different branches 4a to 4d having different lengths, the hooks 5 are stepped along the central axis 2. The branches 3 are similarly folded against branches 4a, 4b, 4c and 4d.

Le dispositif peut alors être introduit aisément dans un conduit destiné à la mise en place du dispositif. The device can then be easily inserted into a conduit intended for the installation of the device.

Le dispositif peut généralement être mis en place par voie percutanée à l'aide d'un cathéter muni d'un piston interne mécanique ou hydraulique, les crochets étant disposés vers la sortie du cathéter. The device can generally be implemented percutaneously using a catheter provided with an internal mechanical or hydraulic piston, the hooks being arranged towards the exit of the catheter.

Après sortie des crochets à l'intérieur du vaisseau on tire l'ensemble de façon à ancrer les crochets 5 dans les parois du vaisseau puis on retire le cathéter. After removal of the hooks inside the vessel, the assembly is pulled so as to anchor the hooks 5 in the walls of the vessel and then the catheter is removed.

Pendant cette opération les branches 6 assurent un excellent positionnement des crochets 5.During this operation, the branches 6 ensure excellent positioning of the hooks 5.

En variante on peut bien sûr mettre en place le dispositif par voie chirurgicale.  As a variant, it is of course possible to place the device surgically.

Claims (4)

REVENDICATIONS 1. Dispositif destiné à arrêter la circulation des thrombus dans les vaisseaux, du type comprenant des branches élastiques disposées régulièrement autour d'un axe central et dont au moins l'extrémité de certaines est munie de crochets dirigés vers l'extérieur pour l'ancrage dans la paroi des vaisseaux, ce dispositif étant caractérisé en ce qu'il comprend, de part et d'autre d'un corps central de liaison (1), et disposées régulièrement autour d'un axe central (2), d'un côté, plusieurs branches élastiques (3, 4a, 4b, 4c, 4d) constituées chacune par un brin courbe, sensiblement parallèle à l'axe central au niveau du corps central, et s'écartant progressivement de cet axe au-delà, au moins trois de ces branches (4a, 4b, 4c, 4d) régulièrement réparties étant munies à leur extrémité d'un crochet (5) dirigé vers l'extérieur, et, de l'autre côté, au moins trois branches élastiques (6) constituées chacune par un brin courbe, sensiblement parallèle à l'axe central au niveau de cet axe et s'écartant progressivement de cet axe au-delà et dont l'extrémité (7) est recourbée vers l'intérieur. 1. Device intended to stop the circulation of thrombi in the vessels, of the type comprising elastic branches regularly arranged around a central axis and at least the end of some of which is provided with hooks directed outwards for anchoring in the vessel wall, this device being characterized in that it comprises, on either side of a central connecting body (1), and regularly arranged around a central axis (2), of a side, several elastic branches (3, 4a, 4b, 4c, 4d) each constituted by a curved strand, substantially parallel to the central axis at the level of the central body, and progressively deviating from this axis beyond, at least three of these branches (4a, 4b, 4c, 4d) regularly distributed being provided at their end with a hook (5) directed towards the outside, and, on the other side, at least three elastic branches (6) formed each by a curved strand, substantially parallel to the central axis at this axis and deviates ant progressively from this axis beyond and the end (7) of which is curved inward. 2. Dispositif selon la revendication 1, caractérisé en ce que les branches (4a, 4b, 4c, 4d) munies de crochets (5) ont une longueur différente. 2. Device according to claim 1, characterized in that the branches (4a, 4b, 4c, 4d) provided with hooks (5) have a different length. 3. Dispositif selon la revendication 1 ou la revendication 2, caractérisé en ce qu'il comprend, d'un côté, huit branches (3, 4a, 4b, 4c, 4d) dont quatre (4a, 4b, 4c, 4d) sont munies d'un crochet (5) à leur extrémité et de l'autre côté quatre branches (6) à extrémité (7) recourbée vers l'intérieur. 3. Device according to claim 1 or claim 2, characterized in that it comprises, on one side, eight branches (3, 4a, 4b, 4c, 4d) of which four (4a, 4b, 4c, 4d) are provided with a hook (5) at their end and on the other side four branches (6) with ends (7) curved inwards. 4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il est en titane ou en acier inoxydable amagnétique.  4. Device according to any one of claims 1 to 3, characterized in that it is made of titanium or non-magnetic stainless steel.
FR8514394A 1985-09-27 1985-09-27 Device intended to stop the circulation of thrombi in vessels Pending FR2587901A1 (en)

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606641A1 (en) * 1986-11-17 1988-05-20 Promed FILTERING DEVICE FOR BLOOD CLOTS
EP0293605A1 (en) * 1987-05-22 1988-12-07 Boston Scientific Corporation Implantable filter
FR2632848A1 (en) * 1988-06-21 1989-12-22 Lefebvre Jean Marie FILTER FOR MEDICAL USE
EP0350043A1 (en) * 1988-07-08 1990-01-10 Aubrey M. Palestrant Mechanically locking blood clot filter
FR2649884A1 (en) * 1989-07-18 1991-01-25 Ems Ind Filter for retention of blood clots
FR2699810A1 (en) * 1992-12-28 1994-07-01 Cardial Sa Device for stopping thrombus circulation in vascular conduits
EP0678284A1 (en) * 1994-04-21 1995-10-25 B. BRAUN CELSA, Société Anonyme Blood filter for temporary or permanent use, and associated implanting device
FR2718950A1 (en) * 1994-04-21 1995-10-27 Braun Celsa Sa Temporary or long-term blood filter
WO1995031229A1 (en) * 1994-05-16 1995-11-23 Tovarichestvo S Ogranichennoi Otvetstvennostju 'comed' Intravenous filter
EP0746236A1 (en) * 1993-10-01 1996-12-11 Boston Scientific Corporation Improved vena cava filter
US5634942A (en) * 1994-04-21 1997-06-03 B. Braun Celsa Assembly comprising a blood filter for temporary or definitive use and a device for implanting it
US5755790A (en) * 1995-04-14 1998-05-26 B. Braun Celsa Intraluminal medical device
US5853420A (en) * 1994-04-21 1998-12-29 B. Braun Celsa Assembly comprising a blood filter for temporary or definitive use and device for implanting it, corresponding filter and method of implanting such a filter
US6231581B1 (en) 1998-12-16 2001-05-15 Boston Scientific Corporation Implantable device anchors
WO2005079701A2 (en) * 2004-02-13 2005-09-01 Boston Scientific Limited Centering intravascular filters and devices and methods for deploying and retrieving intravascular filters
US7699867B2 (en) 2004-04-16 2010-04-20 Cook Incorporated Removable vena cava filter for reduced trauma in collapsed configuration
WO2011055079A1 (en) * 2009-11-06 2011-05-12 A.L.N. Filter for a vena cava and kits containing same
US7972353B2 (en) 2004-04-16 2011-07-05 Cook Medical Technologies Llc Removable vena cava filter with anchoring feature for reduced trauma
US8043322B2 (en) 2004-04-16 2011-10-25 Cook Medical Technologies Llc Removable vena cava filter having inwardly positioned anchoring hooks in collapsed configuration
US8105349B2 (en) 2004-04-16 2012-01-31 Cook Medical Technologies Llc Removable vena cava filter having primary struts for enhanced retrieval and delivery
US8167901B2 (en) 2004-09-27 2012-05-01 Cook Medical Technologies Llc Removable vena cava filter comprising struts having axial bends
US8246672B2 (en) 2007-12-27 2012-08-21 Cook Medical Technologies Llc Endovascular graft with separately positionable and removable frame units
US8246648B2 (en) 2008-11-10 2012-08-21 Cook Medical Technologies Llc Removable vena cava filter with improved leg
US10022212B2 (en) 2011-01-13 2018-07-17 Cook Medical Technologies Llc Temporary venous filter with anti-coagulant delivery method
CN109771089A (en) * 2018-12-21 2019-05-21 先健科技(深圳)有限公司 Filter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334629A (en) * 1964-11-09 1967-08-08 Bertram D Cohn Occlusive device for inferior vena cava
US4425908A (en) * 1981-10-22 1984-01-17 Beth Israel Hospital Blood clot filter
EP0117940A2 (en) * 1982-12-06 1984-09-12 Cook Incorporated Expandable blood clot filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334629A (en) * 1964-11-09 1967-08-08 Bertram D Cohn Occlusive device for inferior vena cava
US4425908A (en) * 1981-10-22 1984-01-17 Beth Israel Hospital Blood clot filter
EP0117940A2 (en) * 1982-12-06 1984-09-12 Cook Incorporated Expandable blood clot filter

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606641A1 (en) * 1986-11-17 1988-05-20 Promed FILTERING DEVICE FOR BLOOD CLOTS
EP0270432A1 (en) * 1986-11-17 1988-06-08 Promed Filter apparatus for blood clots
EP0293605A1 (en) * 1987-05-22 1988-12-07 Boston Scientific Corporation Implantable filter
FR2632848A1 (en) * 1988-06-21 1989-12-22 Lefebvre Jean Marie FILTER FOR MEDICAL USE
EP0348295A1 (en) * 1988-06-21 1989-12-27 LEFEBVRE, Jean-Marie Medical filter
EP0350043A1 (en) * 1988-07-08 1990-01-10 Aubrey M. Palestrant Mechanically locking blood clot filter
FR2649884A1 (en) * 1989-07-18 1991-01-25 Ems Ind Filter for retention of blood clots
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