Source: http://www.google.com/patents/US20020026230?ie=ISO-8859-1&dq=7,682,496
Timestamp: 2015-08-01 16:43:24
Document Index: 304103726

Matched Legal Cases: ['art 16', 'art 18', 'art 16', 'art 18', 'arts 16', 'arts 18', 'arts 16', 'art 18', 'art 16', 'arts 16', 'art 16', 'art 18', 'art 54', 'art 58', 'art 54', 'art 54', 'art 58', 'art 58', 'art 54', 'art 54', 'art 58']

Patent US20020026230 - Removable stent - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsDevice suitable for internally supporting vessels in particular circular vessels in the non-medical and medical fields, such as transmission pipes and blood vessels, the urinary tract, the digestive tract, and airways, said device comprising; an outer wall, and an inner wall in association with the outer...http://www.google.com/patents/US20020026230?utm_source=gb-gplus-sharePatent US20020026230 - Removable stentAdvanced Patent SearchPublication numberUS20020026230 A1Publication typeApplicationApplication numberUS 09/910,008Publication dateFeb 28, 2002Filing dateJul 23, 2001Priority dateFeb 5, 1999Also published asEP1148845A1, WO2000045738A1Publication number09910008, 910008, US 2002/0026230 A1, US 2002/026230 A1, US 20020026230 A1, US 20020026230A1, US 2002026230 A1, US 2002026230A1, US-A1-20020026230, US-A1-2002026230, US2002/0026230A1, US2002/026230A1, US20020026230 A1, US20020026230A1, US2002026230 A1, US2002026230A1InventorsFranciscus Moll, Menno KalmannOriginal AssigneeAtropos LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (19), Classifications (9), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetRemovable stent
[0067] An assembly 1, according to the present invention, FIGS. 1, 2 and 3, has a guide wire 2 a catheter tube 4, an expandable/contractible balloon catheter 6 and a stent 10 arranged in a first contracted position to grip around the balloon catheter 6. [0068] The stent can be pre-tensioned or made from a memory metal to assume a contracted position in its ‘resting’ state. [0069] The balloon catheter 6 can be inflated/deflated by means of the pipes 12 in connection with the catheter tube 4. [0070] The stent 10 consists of four ring like elements 14 each ring provided with a first terminal part 16 and a second terminal part 18 at the other end thereof (see FIGS. 4-6). [0071] The rings 14 are formed from a single length of pre-tensioned material, for example surgical metal, whereby the terminal parts can slide over one another when transforming between the expanded/contracted arrangements. When not being used, the device is so pre-tensioned, rather like a spring, that in this ‘rest’ state it occupies a contracted state (FIG. 6). [0072] Each ring section 14 has an outer wall 20, which outer wall 20 contacts the internal surface of the body vessel when in its expanded treating position, and an inner wall 22 which contacts to grip around the balloon catheter 6, when the device is arranged thereon, FIGS. 2, 3. [0073] The four rings 14 are joined to provide the tubular form of the device, by means of links 24. [0074] The first terminal part 16, of each ring 14, see particularly FIGS. 7 and 8 is provided with two laterally arranged down turned guiding lip-sections 26, and arranged there between a downturned, somewhat truncated, releasable locking edge 28. [0075] The second terminal part 18 of the rings 14 is provided with a number of laterally arranged receiving openings 30 which are interlockable with the locking edge 28, of terminal 16. [0076] In a second preferred embodiment of the stent (FIG. 9), the rings are joined by links arranged on a terminal part of the rings, and this terminal part is provided with a cut-away receiving section 40 which is releasably interlockable with a finger element 42 arranged on the other terminal part of the rings. [0077] In a third preferred embodiment of the stent (FIG. 10), terminal parts of the rings are provided with depending studs 50 which are interlockable with corresponding U profiles 52 arranged on the other terminal parts of the rings. [0078] In a fourth preferred embodiment of the stent as shown in FIG. 11, terminal ends of the rings are laterally provided with up turned cuffs 60 which co-operate with narrowing profiles 62 of the other terminal parts of the ring sections. [0079] In use, the stent is arranged in its first contracted state, see FIGS. 2 and 4 around the deflated balloon catheter 6. In the first contracted state, the first terminal parts 16 overlap the second terminal parts 18. The assembly is then guided into position to the pre-determined treatment site within a body vessel, as shown in FIG. 1, at which treatment site the balloon catheter 6 is expanded. On inflation of the balloon catheter 6, the stent is unravelled so that the outer wall 20 thereof is pushed against the inner surface of the body vessel (see FIG. 3). The balloon catheter 6 is controllably expanded to such an extent that the terminal parts 16, respectively 18 of the rings are displaced, the rings 14 therefore expanding, so that the second terminal part 18 of the rings 14, in the first contracted state residing on the inner wall 22 of the rings 14, slips through the lips 26 of the first terminal part 16 of the rings so that the locking edge 28 falls into one of the corresponding openings 30. In this position the stent is locked in its expanded, treatment position (see FIG. 5). [0080] The degree of expansion of the stent can be controlled by the degree of expansion of the balloon catheter. Body vessels of varying internal diameters are catered for by the presence of a plurality of receiving openings 30. [0081] It will be clear that the embodiments as shown in FIGS. 9, 10 and 11 are expandable and lockable by the same principle. [0082] Once the period of treatment has expired, the balloon catheter 6 can once more be inserted into the body vessel and inflated to force open the stent whereby the locking means are decoupled, i.e. whereby the locking edge 28 is forced up out of the corresponding opening 30 so that the two terminal parts 16, 18 of the rings are forced further apart until the terminal part 16 now slips beneath the terminal part 18 to re-assume a pre-tensioned second contracted state, the rings contracting to once more grip around the balloon catheter (see FIG. 6). [0083] The balloon catheter can then be deflated whereby the two ends of the rings slide over one another until the stent re-assumes its pre-tensioned contracted position, gripping around the balloon catheter. [0084] It will be obvious that the embodiments as shown in FIGS. 9, 10 and 11 work by exactly the same principle. [0085] A further preferred embodiment of the device according to the present invention is shown in FIGS. 12-19. [0086] This embodiment of the device 50 comprises four ring sections 52, each consisting of a strip of pre-tensioned material, which at a first terminal part 54 are joined together by a backbone 56 and which at a second terminal part 58 are provided with a tapered male stub 60. [0087] Continuous with the rings 52 and arranged in the first terminal part 54 are female receiving openings 62 interlockable with the male projecting stubs 60, and guiding apertures 64 arranged between the female receiving openings 62 and a terminal edge of the first terminal part 54. [0088] In use, the device 50 is arranged to grip around a deflated balloon catheter (see FIG. 12) in which contracted, rest position the device 50 is pre-tensioned to grip around the deflated balloon catheter C. In this first contracted position, the second terminal part 58 is not extended through the aperture 64. [0089] Subsequently the device 50 gripping around the balloon catheter C can be inserted into a blood vessel B (see FIG. 13) and displaced therethrough until the treatment site has been reached (see FIG. 14). [0090] At this treatment site, the balloon catheter C can be further expanded so that the rings 52 unraffle so that the second terminal part 58 slips over the edge of the first terminal part 54 whereby the stubs 60 slip into the female receiving opening 62 (see FIG. 15) to releasably lock the rings 52 in their expanded positions (see FIG. 15). At this point the balloon catheter C can be deflated and removed from the blood vessel (see FIG. 16). [0091] In this expanded state, the stent can be left within the blood vessel until the treatment has been completed. [0092] Subsequently, the stent can be removed by reinserting the balloon catheter C into the blood vessel B and through the stent. Now the balloon catheter C can be once again expanded to force the male stubs 60 up and out of the female receiving openings 62 so that the male stubs 60 slide over the first terminal part 54 and into the guiding apertures 64, at which point the balloon catheter is deflated so that the second terminal part 58 is displaced through the aperture 64 on recontracting of the stent 50 to assume its second rest, contracted state (see FIG. 18 and 19). The apertures 64 ensure a good degree of safety and controllability over the recontraction of the stent. In this contracted state, the stent can then be removed from the blood vessel. [0093] A further embodiment of the device according to the present invention is shown in FIGS. 20 and 21 and consists of a single strip of either pre-tensioned material or memory metal. [0094] This ring strip 80 is provided at a first terminal end thereof with a female receiving opening 94 and a strip guiding aperture 86 and at a second terminal end thereof with a male projecting stub 88 which interlocks with the female receiving opening 94 in an expanded state (see FIG. 21). [0095] When being released from this expanded state (FIG. 21), the male stub 88 slips through the receiving aperture 86 to reassume a second contracted state wherein the stent is removable (FIG. 20). [0096] The first contracted state wherein the strip does not extend through the guiding aperture 86 is not shown. [0097] Referring to FIGS. 22 to 32 and initially to FIG. 22 thereof an expandable stent 100 is typically manufactured from a shape memory material such as Nitinol. The stent 100 in this case comprises a series of rings 102, only two of which are illustrated. Each of the rings 102 is of generally spiral shape having a first free end 105 and a second free end 106. In the contracted configuration illustrated in FIG. 22 the first free end 105 is an inner free end and the second free end 106 is an outer free end. The first free end 105 is defined at the end of a strap portion 109 and a buckle portion 110 adjacent the second free end 106 has a first strap receiving slot 111 and a second strap receiving slot 112 which are most clearly visible in FIGS. 29 and 30. The strap portion 109 is received in the slots 111, 112 to lock the stent in various configurations as described in more detail below. [0098] To prepare the stent 100 for use, the spiral contracted configuration of FIG. 22 is reversed by moving the inner free end 105 out over the outer free end 106 so that the first free end 105 becomes an outer free end and the second free end 106 becomes an inner free end as illustrated in FIG. 23. The stent is thereby pretensioned and is urged to return to the contracted configuration of FIG. 22. In the pretensioned configuration of FIG. 23 the strap portion 109 extends outwardly through the slot 111 in the buckle portion 110. [0099] The stent in the pretensioned configuration of FIG. 23 is then loaded onto an introduction balloon 120 of an introduction catheter 121. The catheter 121 is advanced to a treatment site such as a stenosis. The introduction balloon 120 is inflated as illustrated in FIGS. 25 and 26 until the free end 105 of the strap portion 109 is aligned with the slot 112. The strap portion 109 then engages in the slot 112 and is locked in this configuration by the engagement of a shoulder 125 adjacent to the strap section 109 against the stent wall in the region of the slot 112 as illustrated in FIG. 27. By this action the stent is locked in this first expanded configuration and the balloon 120 may be deflated and the introducer catheter 121 withdrawn leaving the stent in situ as illustrated in FIG. 28. [0100] To retrieve the stent 100 a retrieval catheter 130 with a retrieval balloon 131 is advanced to the location of the stent. The retrieval balloon 131 is then inflated to expand to a diameter greater than that of the introducing balloon 120 causing the strap 109 to disengage from the slot 112 as illustrated in FIG. 29. Continued inflation of the retrieval balloon 131 pushes the slot 111 over the strap 109 until the free end 105 lies on the inside of the stent (FIG. 30). This is the manufactured configuration of the stent (FIG. 22) and on deflation of the retrieval balloon 131 the stent, by virtue of the shape memory of the material, contracts (FIG. 31). The contracted stent 100 is then removed from the vasculature carried by the retrieval balloon 131 on the retrieval catheter 130. [0101] The stent may be used as a medicament or drug delivery device. In one embodiment of this aspect the stent is coated with a porous drug-containing coating. Alternatively or additionally a craft or tissue 150 may be used to cover at least part of the stent and/or, especially as illustrated in FIG. 32, to extend between adjacent rings. The craft or tissue may be a bioabsorbable or biodegradable material which is impregnated with a drug to be delivered to a treatment site. In some cases a layered tissue may be used. One layer may be used to carry drugs and deliver these at the site. A second layer may be used to prevent flow of drug in the opposite direction. Such a layered structure allows treatment to be delivered at the outside of the stent to the wall of the lumen, or treating the material (such as blood) that is on the inside of the stent and not the wall of the lumen. This provides an even further enhanced localised and precise treatment. [0102] The drug delivery technique utilising the stent described is particularly advantageous as the stent and therefore the associated drug can be removed during treatment. The stent is readily delivered, used for treatment and removed. [0103] The drugs, which may be delivered using the stent and delivery technique, may be, for example, anticoagulant or antithrombotic agents, anti-inflammatory agents and the like. [0104] The present invention is not limited to the above described preferred embodiments; the rights of the present invention are to be determined by the following claims, in which many modification are possible. Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2151733May 4, 1936Mar 28, 1939American Box Board CoContainerCH283612A * Title not availableFR1392029A * Title not availableFR2166276A1 * Title not availableGB533718A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6569181Dec 20, 2000May 27, 2003Advanced Cardiovascular Systems, Inc.Stent retrieval systemUS7279664Jul 26, 2005Oct 9, 2007Boston Scientific Scimed, Inc.Resonator for medical deviceUS7304277Aug 23, 2005Dec 4, 2007Boston Scientific Scimed, IncResonator with adjustable capacitor for medical deviceUS7423496Nov 9, 2005Sep 9, 2008Boston Scientific Scimed, Inc.Resonator with adjustable capacitance for medical deviceUS7524282Aug 29, 2005Apr 28, 2009Boston Scientific Scimed, Inc.Cardiac sleeve apparatus, system and method of useUS7595469May 24, 2005Sep 29, 2009Boston Scientific Scimed, Inc.Resonator for medical deviceUS7812290Apr 30, 2007Oct 12, 2010Boston Scientific Scimed, Inc.Resonator for medical deviceUS7838806Nov 2, 2007Nov 23, 2010Boston Scientific Scimed, Inc.Resonator with adjustable capacitor for medical deviceUS7871369Mar 31, 2009Jan 18, 2011Boston Scientific Scimed, Inc.Cardiac sleeve apparatus, system and method of useUS8038704Jul 27, 2005Oct 18, 2011Paul S. SherburneStent and other objects removal from a bodyUS8046048Jul 29, 2008Oct 25, 2011Boston Scientific Scimed, Inc.Resonator with adjustable capacitance for medical deviceUS8058593Aug 31, 2009Nov 15, 2011Boston Scientific Scimed, Inc.Resonator for medical deviceUS8066759Aug 19, 2005Nov 29, 2011Boston Scientific Scimed, Inc.Resonator for medical deviceUS8235054Feb 22, 2011Aug 7, 2012Applied Medical Resources CorporationWound retractorUS8470016Sep 22, 2011Jun 25, 2013Paul SherburneStent and other object removal from a bodyUS8568469 *Jun 28, 2004Oct 29, 2013Advanced Cardiovascular Systems, Inc.Stent locking element and a method of securing a stent on a delivery systemUS8932214May 11, 2011Jan 13, 2015Applied Medical Resources CorporationSurgical access systemUS8973583Jun 26, 2012Mar 10, 2015Applied Medical Resources CorporationWound retractorUS20110172697 *Sep 15, 2009Jul 14, 2011Joensson AndersMedical Device, Method And System For Temporary Occlusion Of An Opening In A Lumen Of A Body* Cited by examinerClassifications U.S. Classification623/1.13, 623/1.17International ClassificationA61F2/93, A61F2/92, A61M36/04, A61F2/00Cooperative ClassificationA61F2/93, A61F2210/0095European ClassificationA61F2/92Legal EventsDateCodeEventDescriptionJul 23, 2001ASAssignmentOwner name: ATROPOS LIMITED, IRELANDFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOLL, FRANCISCUS LAURENS;KLAMANN, MENNO;REEL/FRAME:012016/0359;SIGNING DATES FROM 20010710 TO 20010720Aug 13, 2003ASAssignmentOwner name: SURGICAL INNOVATIONS V.O.F., NETHERLANDSFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ATROPOS LIMITED;REEL/FRAME:014383/0212Effective date: 20021014RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services