WO2001000111A1 - Device and method for treatment of mitral insufficiency - Google Patents

Device and method for treatment of mitral insufficiency Download PDF

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Publication number
WO2001000111A1
WO2001000111A1 PCT/SE2000/001369 SE0001369W WO0100111A1 WO 2001000111 A1 WO2001000111 A1 WO 2001000111A1 SE 0001369 W SE0001369 W SE 0001369W WO 0100111 A1 WO0100111 A1 WO 0100111A1
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WO
WIPO (PCT)
Prior art keywords
elongate body
coronary sinus
curvature
mitral
shortening
Prior art date
Application number
PCT/SE2000/001369
Other languages
French (fr)
Inventor
Jan Otto Solem
Per Ola Kimblad
Original Assignee
Jan Otto Solem
Per Ola Kimblad
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26663608&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2001000111(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to AU60386/00A priority Critical patent/AU6038600A/en
Priority to JP2001505828A priority patent/JP4381640B2/en
Priority to EP00946661A priority patent/EP1196113A1/en
Priority to US10/019,563 priority patent/US7044967B1/en
Priority to CA002369129A priority patent/CA2369129C/en
Application filed by Jan Otto Solem, Per Ola Kimblad filed Critical Jan Otto Solem
Priority to KR1020017016818A priority patent/KR20020033646A/en
Priority to BR0012314-5A priority patent/BR0012314A/en
Publication of WO2001000111A1 publication Critical patent/WO2001000111A1/en
Priority to US10/953,047 priority patent/US7311728B2/en
Priority to US11/643,352 priority patent/US7637945B2/en
Priority to US11/841,782 priority patent/US7717954B2/en
Priority to US12/750,438 priority patent/US20100185273A1/en

Links

Classifications

    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2442—Annuloplasty rings or inserts for correcting the valve shape; Implants for improving the function of a native heart valve
    • A61F2/2451—Inserts in the coronary sinus for correcting the valve shape
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00238—Type of minimally invasive operation
    • A61B2017/00243—Type of minimally invasive operation cardiac
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00867—Material properties shape memory effect
    • 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
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2002/826—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents more than one stent being applied sequentially
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
    • Y10S623/902—Method of implanting
    • Y10S623/903—Blood vessel

Definitions

  • the present invention generally relates to a device and a method for treatment of mitral insufficiency and, more specifically, for treatment of dilatation of the mitral annulus .
  • Mitral insufficiency can result from several causes, such as ischemic disease, degenerative disease of the mitral apparatus, rheumatic fever, endocarditis, congenital heart disease and cardiomyopathy .
  • the four major structural components of the mitral valve are the annulus, the two leaflets, the chordae and the papillary muscles. Any one or all of these in different combinations may be injured and create insufficiency.
  • Annular dilatation is a major component in the pathology of mitral insufficiency regardless of cause.
  • mitral insufficiency primarily or only due to posterior annular dilatation, since the annulus of the anterior leaflet does not dilatate because it is anchored to the fibrous skeleton of the base of the heart .
  • mitral insufficiency usually progress to severe disability within five years.
  • the treatment consists of either mitral valve replacements or repair, both methods requiring open heart surgery. Replacement can be performed with either mechanical or biological valves.
  • Mitral valve repair is theoretically possible if an essentially normal anterior leaflet is present.
  • the basic four techniques of repair include the use of an annuloplasty ring, quadrangular segmental resection of diseased posterior leaflet, shortening of elongated chordae, and transposition of posterior leaflet chordae to the anterior leaflet .
  • Annuloplasty rings are needed to achieve a durable reduction of the annular dilatation. All the common rings are sutured along the posterior mitral leaflet adjacent to the mitral annulus in the left atrium.
  • the Duran ring encircles the valve completely, whereas the others are open towards the anterior leaflet .
  • the ring can either be rigid, like the original Carpentier ring, or flexible but non-elastic, like the Duran ring or the Cosgrove-Edwards ring .
  • a first object of the present invention is to provide a device and a method for treatment of mitral insufficiency without the need for cardiopulmonary by-pass and opening of the chest and heart.
  • a second object of the invention is to provide reduction of the mitral annulus using less invasive surgery.
  • a device for treatment of mitralis insufficiency comprises an elongate body having such dimensions as to be insertable into the coronary sinus and having two states, in a first state of which the elongate body has a shape that is adaptable to the shape of the coronary sinus, and to the second state of which the elongate body is transferable from the said first state assuming a reduced radius of curvature, whereby the radius of curvature of the coronary sinus is reduced as well as the circumference of the mitral valve annulus, when the elongate body is positioned in the coronary sinus.
  • means are provided for the transfer of the elongate body to the second state by bending and/or shortening it from a larger radius of curvature to a smaller radius of curvature.
  • the transfer means may comprise means for bending and/or shortening the elongate body by a preferably asymmetric contraction thereof.
  • the elongate body may comprise a memory material providing the transfer to the second state.
  • the elongate body may comprise a stent .
  • the device according to the invention may comprise several stent sections and said bending and/or shortening means may comprise wires for shortening the distance between the stent sections.
  • a method of reducing the circumference of the mitral valve annulus comprises the steps of inserting an elongate body into the coronary sinus in the vicinity of the posterior leaflet of the mitral valve, and then providing a bending and/or shortening of the elongate body when positioned in the coronary sinus so as to reduce the curvature of the coronary sinus and thereby reduce the circumference of the mitral valve annulus.
  • the present invention takes advantage of the position of the coronary sinus being close to the mitral annulus. This makes repair possible by the use of current catheter-guided techniques.
  • the coronary veins drain blood from the myocardium to the right atrium.
  • the smaller veins drain blood directly into the atrial cavity, and the larger veins accompany the major arteries and run into the coronary sinus which substantially encircles the mitral orifice and annulus. It runs in the posterior atrioventricular groove, lying in the fatty tissue between the left atrial wall and the ventricular myocardium, before draining into the right atrium between the atrial septum and the post- Eustachian sinus .
  • the course of the coronary sinus may approach within 5-15 mm of the medial attachment of the posterior leaflet of the mitral valve.
  • Preliminary measurements performed at autopsies of adults of normal weight show similar results, with a distance of 5,3 ⁇ 0,6 mm at the medial attachment and about 10 mm at the lateral aspect of the posterior leaflet.
  • the circumference of the coronary sinus was 18,3+2,9 mm at its ostium (giving a diameter of the posterior leaflet of 5,8 ⁇ 0,9 mm) and 9,7+0,6 mm along the lateral aspect of the posterior leaflet (corresponding to a diameter of 3, 1+0, 2 mm) .
  • FIG. 1 is a cross-sectional view of a part of a heart
  • FIG. 2 and 3 are schematic views of a first embodiment of a device according to the present invention
  • Figs 4-6 are schematic views illustrating an instrument, which may be used when positioning the device shown in Figs 2 and 3 in the coronary sinus,
  • Fig. 7 is a partial, enlarged view of the first embodiment shown in Fig. 2.
  • Figs 8 and 9 are schematic views illustrating the positioning of the device of Figs 2 and 3 in the coronary sinus .
  • Figs 10 and 11 are schematic views illustrating the positioning of a second embodiment of the device according to the present invention in the coronary sinus.
  • Figs 12 and 13 are schematic views illustrating the positioning of a third embodiment of the device according to the present invention in the coronary sinus.
  • Fig 1 is a cross-sectional view through the heart area of the posterior atrioventricular groove 1, which is filled with fatty tissue. It shows the posterior leaflet 2 of the mitral valve and the adjoining parts 3, 4 of the atrial myocardium and the ventricular myocardium.
  • the coronary sinus 5 is shown close to the mitral annulus 6 and behind the attachment 7 of the posterior leaflet 2. Since the coronary sinus 5 substantially encircles the mitral annulus 6, a reduction of the radius of curvature of the bent coronary sinus 5 also will result in a diameter and circumference reduction of the mitral annulus 6.
  • the device of Fig. 2 comprises an elongate body 8 made of memory metal, e.g. Nitinol, or other similar material which has a memory of an original shape, illustrated in Fig. 3, and can be temporary forced into another shape, illustrated in Fig. 2.
  • This elongate body 8 comprises one, two or more memory metal strings 9 of helical or other shape so as to fit together and be able of permitting the movements described below.
  • several hooks 10 are fastened so as to extend radially out therefrom. These hooks 10 are covered by a cover sheet 11 in Fig. 2.
  • the elongate body 8 is forced into a stretched or extended state by means of a stabilising instrument 12 shown in Fig. 4.
  • This instrument 12 has two arms 13 at a distal end 14 of a rod 15 and a locking means 16 at a proximal end of the rod 15.
  • the distance between the ends of the rod 15 corresponds to the desired length of the elongate body 8 when being inserted into the coronary sinus 5.
  • the arms 13 are free to move between the position shown in Fig. 4 and a position in alignment with the rod 15, as shown in Fig. 6.
  • the locking means 16 has two locking knobs 17, which are pressed radially outwards from the rod 15 by two spring blades 18.
  • the elongated body 8 can be pushed over the rod 15 of the stabilising instrument 12, then stretched between the arms 13 and the knobs 17, and finally locked in its stretched state on the stabilising instrument 12 between the arms 13 and the knobs 17, as illustrated in Fig. 5.
  • the rod 15 may be a metal wire which is relatively stiff between the distal end 14 and the locking means 16 but still so bendable that it will follow the shape of the coronary sinus 5.
  • the metal wire of the stabilising instrument 11 is more pliable to be able to easily follow the bends of the veins .
  • the above-described elongate body 8 is positioned in the coronary sinus 5 in the following way:
  • An introduction sheet (not shown) of synthetic material may be used to get access to the venous system.
  • a long guiding wire (not shown) of metal is advanced through the introduction sheet and via the venous system to the coronary sinus 5.
  • This guiding wire is provided with X- ray distance markers so that the position of the guiding wire in the coronary sinus 5 may be monitored.
  • the elongate body 8 is locked onto the stabilising instrument 12, as shown in Fig. 5, and introduced into the long cover sheet 11 of synthetic material. This aggregate is then pushed through the introduction sheet and the venous system to the coronary sinus 5 riding on the guiding wire. After exact positioning of the elongate body 8 in the coronary sinus 5, as illustrated in Fig. 8 where the mitral valve 19 is shown having a central gap
  • the cover sheet 11 is retracted exposing the elongate body 8 within the coronary sinus 5. This manoeuvre allows the hooks 10 on the elongate body 8 to dig into the walls of the coronary sinus 5 and into the heart . The elongate body 8 is still locked on to the stabilising instrument 12 such that the hooks 10 engage the walls of the coronary sinus 5 in the stretched or extended state of the elongate body 8.
  • a catheter 21, shown in Fig. 6, is pushed forward on the guiding wire and the rod 15 for releasing the elongate body 8 from the locking means 16 by pressing the spring blades 18 towards the rod 15.
  • This movement releases the knobs 17 as well as the arms 13 from engagement with the elongate body 8 which contracts as illustrated in Fig. 9 and as a result bends towards the mitral valve annulus 6 moving the posterior part thereof forward (shown by arrows in Fig. 9) .
  • This movement reduces the circumference of the mitral valve annulus 6 and thereby closes the central gap 20.
  • FIG. 7 illustrates a part of an arrangement of the wires 9 and the hooks 10 along a peripheral part of the elongate body 8, whereby the elongate body 8 will be asymmetrically contracted resulting in a bending thereof when interconnecting parts 22 of at least some of the hooks 10 are shortened to an original shape.
  • Figs 10 and 11 illustrate an alternative embodiment of an elongate body 8', which is a solid wire in the shape of an open U-shaped ring that will engage the wall of the coronary sinus 5 most adjacent to the mitral valve annulus 6 when inserted into the coronary sinus 5.
  • the elongate body 8' consists of a memory metal material which when reverting to its original shape will bend as illustrated in Fig. 11.
  • the return of the open ring 8' to its original shape may be initiated in several ways, as is obvious to the man skilled in the art.
  • the third embodiment of the elongate body 8" illustrated in Figs 12 and 13, comprises three stent sections 23-25 positioned at one end of the elongate body 8", at the middle thereof and at the other end of the elongate body 8", respectively.
  • These stent sections 23- 25 may be positioned in the coronary sinus 5 as illustrated by conventional means, such that their positions are fixed. They are connected by wires 26, 27, which may be manoeuvred from outside the vein system such that the distances between the adjacent stent sections 23, 24 and 24, 25 are reduced. More specifically, these distances are reduced asymmetrically, i.e. more on the side of coronary sinus 5 most adjacent to the posterior part of the mitral valve annulus 6. Thereby, the elongate body 8" is bent, as illustrated in Fig. 13, and presses the coronary sinus 5 against the mitral valve annulus 6 closing the gap 20.
  • the present invention provides a device placed in the coronary sinus, designed to reduce the dilatation of the mitral annulus.
  • This device is at a distance from the attachment of the posterior leaflet that does not much exceed the distance at which present annuloplasty rings are placed by open surgery techniques, and the coronary sinus is along its entire course large enough to hold such a device.
  • the device could be positioned by catheter technique or any other adequate technique and offers a safer alternative to the current open surgery methods.
  • the device could be designed or heparincoated so as to avoid thrombosis in the coronary sinus, thus reducing the need for aspirin, ticlopedine or anticoagulant therapy.

Abstract

A device for treatment of mitral annulus dilatation comprises an elongate body (8) having two states. In a first of these states the elongate body (8) is insertable into the coronary sinus (5) and has a shape adapting to the shape of the coronary sinus (5). When positioned in the coronary sinus (5), the elongate body (8) is transferable to the second state assuming a reduced radius of curvature, whereby the radius of curvature of the coronary sinus (5) and the radius of curvature as well as the circumference of the mitral annulus (6) is reduced.

Description

DEVICE AND METHOD FOR TREATMENT OF MITRAL INSUFFICIENCY
The present invention generally relates to a device and a method for treatment of mitral insufficiency and, more specifically, for treatment of dilatation of the mitral annulus . Mitral insufficiency can result from several causes, such as ischemic disease, degenerative disease of the mitral apparatus, rheumatic fever, endocarditis, congenital heart disease and cardiomyopathy . The four major structural components of the mitral valve are the annulus, the two leaflets, the chordae and the papillary muscles. Any one or all of these in different combinations may be injured and create insufficiency. Annular dilatation is a major component in the pathology of mitral insufficiency regardless of cause. Moreover, many patients have a mitral insufficiency primarily or only due to posterior annular dilatation, since the annulus of the anterior leaflet does not dilatate because it is anchored to the fibrous skeleton of the base of the heart . Studies of the natural history of mitral insufficiency have found that totally asymptomatic patients with severe mitral insufficiency usually progress to severe disability within five years. At present the treatment consists of either mitral valve replacements or repair, both methods requiring open heart surgery. Replacement can be performed with either mechanical or biological valves.
The mechanical valve carries the risk of thromboembolism and requires anticoagulation, with all its potential hazards, whereas biological prostheses suffer from limited durability. Another hazard with replacement is the risk of endocarditis. These risks and other valve related complications are greatly diminished with valve repair. Mitral valve repair is theoretically possible if an essentially normal anterior leaflet is present. The basic four techniques of repair include the use of an annuloplasty ring, quadrangular segmental resection of diseased posterior leaflet, shortening of elongated chordae, and transposition of posterior leaflet chordae to the anterior leaflet .
Annuloplasty rings are needed to achieve a durable reduction of the annular dilatation. All the common rings are sutured along the posterior mitral leaflet adjacent to the mitral annulus in the left atrium. The Duran ring encircles the valve completely, whereas the others are open towards the anterior leaflet . The ring can either be rigid, like the original Carpentier ring, or flexible but non-elastic, like the Duran ring or the Cosgrove-Edwards ring .
Effective treatment of mitral insufficiency currently requires open-heart surgery, by the use of total cardiopulmonary by-pass, aortic cross-clamping and cardioplegic arrest.
To certain groups of patient, this is particular hazardous. Elderly patients, patients with a poor left ventricular function, renal disease, severe calcification of the aorta, previous cardiac surgery or other concomitant diseases, would in particular most likely benefit from a less invasive approach, even if repair is not complete. The current trend towards less invasive coronary artery surgery, without cardiopulmonary by-pass, as well as PTCA will also call for a development of a less invasive method for repair of the often concomitant mitral insufficiency.
Therefore, a first object of the present invention is to provide a device and a method for treatment of mitral insufficiency without the need for cardiopulmonary by-pass and opening of the chest and heart. A second object of the invention is to provide reduction of the mitral annulus using less invasive surgery.
These and other objects are attained by a device as defined in the appended claim 1, and by a method as defined in the appended claim 7.
According to the present invention, a device for treatment of mitralis insufficiency comprises an elongate body having such dimensions as to be insertable into the coronary sinus and having two states, in a first state of which the elongate body has a shape that is adaptable to the shape of the coronary sinus, and to the second state of which the elongate body is transferable from the said first state assuming a reduced radius of curvature, whereby the radius of curvature of the coronary sinus is reduced as well as the circumference of the mitral valve annulus, when the elongate body is positioned in the coronary sinus.
Preferably, means are provided for the transfer of the elongate body to the second state by bending and/or shortening it from a larger radius of curvature to a smaller radius of curvature.
The transfer means may comprise means for bending and/or shortening the elongate body by a preferably asymmetric contraction thereof.
Further, the elongate body may comprise a memory material providing the transfer to the second state.
In a preferred embodiment, the elongate body may comprise a stent . In an alternative embodiment, the device according to the invention may comprise several stent sections and said bending and/or shortening means may comprise wires for shortening the distance between the stent sections.
According to a second aspect, a method of reducing the circumference of the mitral valve annulus comprises the steps of inserting an elongate body into the coronary sinus in the vicinity of the posterior leaflet of the mitral valve, and then providing a bending and/or shortening of the elongate body when positioned in the coronary sinus so as to reduce the curvature of the coronary sinus and thereby reduce the circumference of the mitral valve annulus.
Thus, the present invention takes advantage of the position of the coronary sinus being close to the mitral annulus. This makes repair possible by the use of current catheter-guided techniques. The coronary veins drain blood from the myocardium to the right atrium. The smaller veins drain blood directly into the atrial cavity, and the larger veins accompany the major arteries and run into the coronary sinus which substantially encircles the mitral orifice and annulus. It runs in the posterior atrioventricular groove, lying in the fatty tissue between the left atrial wall and the ventricular myocardium, before draining into the right atrium between the atrial septum and the post- Eustachian sinus . In an adult, the course of the coronary sinus may approach within 5-15 mm of the medial attachment of the posterior leaflet of the mitral valve. Preliminary measurements performed at autopsies of adults of normal weight show similar results, with a distance of 5,3±0,6 mm at the medial attachment and about 10 mm at the lateral aspect of the posterior leaflet. The circumference of the coronary sinus was 18,3+2,9 mm at its ostium (giving a diameter of the posterior leaflet of 5,8±0,9 mm) and 9,7+0,6 mm along the lateral aspect of the posterior leaflet (corresponding to a diameter of 3, 1+0, 2 mm) .
The invention will be better understood by the following description of preferred embodiments referring to the appended drawings, in which Fig. 1 is a cross-sectional view of a part of a heart , Figs 2 and 3 are schematic views of a first embodiment of a device according to the present invention,
Figs 4-6 are schematic views illustrating an instrument, which may be used when positioning the device shown in Figs 2 and 3 in the coronary sinus,
Fig. 7 is a partial, enlarged view of the first embodiment shown in Fig. 2.
Figs 8 and 9 are schematic views illustrating the positioning of the device of Figs 2 and 3 in the coronary sinus ,
Figs 10 and 11 are schematic views illustrating the positioning of a second embodiment of the device according to the present invention in the coronary sinus, and
Figs 12 and 13 are schematic views illustrating the positioning of a third embodiment of the device according to the present invention in the coronary sinus.
Fig 1 is a cross-sectional view through the heart area of the posterior atrioventricular groove 1, which is filled with fatty tissue. It shows the posterior leaflet 2 of the mitral valve and the adjoining parts 3, 4 of the atrial myocardium and the ventricular myocardium. The coronary sinus 5 is shown close to the mitral annulus 6 and behind the attachment 7 of the posterior leaflet 2. Since the coronary sinus 5 substantially encircles the mitral annulus 6, a reduction of the radius of curvature of the bent coronary sinus 5 also will result in a diameter and circumference reduction of the mitral annulus 6.
The device of Fig. 2 comprises an elongate body 8 made of memory metal, e.g. Nitinol, or other similar material which has a memory of an original shape, illustrated in Fig. 3, and can be temporary forced into another shape, illustrated in Fig. 2. This elongate body 8 comprises one, two or more memory metal strings 9 of helical or other shape so as to fit together and be able of permitting the movements described below. Along the elongate body 8 several hooks 10 are fastened so as to extend radially out therefrom. These hooks 10 are covered by a cover sheet 11 in Fig. 2. The elongate body 8 is forced into a stretched or extended state by means of a stabilising instrument 12 shown in Fig. 4. This instrument 12 has two arms 13 at a distal end 14 of a rod 15 and a locking means 16 at a proximal end of the rod 15. The distance between the ends of the rod 15 corresponds to the desired length of the elongate body 8 when being inserted into the coronary sinus 5.
The arms 13 are free to move between the position shown in Fig. 4 and a position in alignment with the rod 15, as shown in Fig. 6. The locking means 16 has two locking knobs 17, which are pressed radially outwards from the rod 15 by two spring blades 18. Thus, the elongated body 8 can be pushed over the rod 15 of the stabilising instrument 12, then stretched between the arms 13 and the knobs 17, and finally locked in its stretched state on the stabilising instrument 12 between the arms 13 and the knobs 17, as illustrated in Fig. 5. The rod 15 may be a metal wire which is relatively stiff between the distal end 14 and the locking means 16 but still so bendable that it will follow the shape of the coronary sinus 5. Proximally of the locking means 16 the metal wire of the stabilising instrument 11 is more pliable to be able to easily follow the bends of the veins . The above-described elongate body 8 is positioned in the coronary sinus 5 in the following way:
An introduction sheet (not shown) of synthetic material may be used to get access to the venous system.
Having reached access to the venous system, a long guiding wire (not shown) of metal is advanced through the introduction sheet and via the venous system to the coronary sinus 5. This guiding wire is provided with X- ray distance markers so that the position of the guiding wire in the coronary sinus 5 may be monitored.
The elongate body 8 is locked onto the stabilising instrument 12, as shown in Fig. 5, and introduced into the long cover sheet 11 of synthetic material. This aggregate is then pushed through the introduction sheet and the venous system to the coronary sinus 5 riding on the guiding wire. After exact positioning of the elongate body 8 in the coronary sinus 5, as illustrated in Fig. 8 where the mitral valve 19 is shown having a central gap
20, the cover sheet 11 is retracted exposing the elongate body 8 within the coronary sinus 5. This manoeuvre allows the hooks 10 on the elongate body 8 to dig into the walls of the coronary sinus 5 and into the heart . The elongate body 8 is still locked on to the stabilising instrument 12 such that the hooks 10 engage the walls of the coronary sinus 5 in the stretched or extended state of the elongate body 8.
A catheter 21, shown in Fig. 6, is pushed forward on the guiding wire and the rod 15 for releasing the elongate body 8 from the locking means 16 by pressing the spring blades 18 towards the rod 15. This movement releases the knobs 17 as well as the arms 13 from engagement with the elongate body 8 which contracts as illustrated in Fig. 9 and as a result bends towards the mitral valve annulus 6 moving the posterior part thereof forward (shown by arrows in Fig. 9) . This movement reduces the circumference of the mitral valve annulus 6 and thereby closes the central gap 20. Fig. 7 illustrates a part of an arrangement of the wires 9 and the hooks 10 along a peripheral part of the elongate body 8, whereby the elongate body 8 will be asymmetrically contracted resulting in a bending thereof when interconnecting parts 22 of at least some of the hooks 10 are shortened to an original shape.
Figs 10 and 11 illustrate an alternative embodiment of an elongate body 8', which is a solid wire in the shape of an open U-shaped ring that will engage the wall of the coronary sinus 5 most adjacent to the mitral valve annulus 6 when inserted into the coronary sinus 5. The elongate body 8' consists of a memory metal material which when reverting to its original shape will bend as illustrated in Fig. 11. The return of the open ring 8' to its original shape may be initiated in several ways, as is obvious to the man skilled in the art.
The third embodiment of the elongate body 8" , illustrated in Figs 12 and 13, comprises three stent sections 23-25 positioned at one end of the elongate body 8", at the middle thereof and at the other end of the elongate body 8", respectively. These stent sections 23- 25 may be positioned in the coronary sinus 5 as illustrated by conventional means, such that their positions are fixed. They are connected by wires 26, 27, which may be manoeuvred from outside the vein system such that the distances between the adjacent stent sections 23, 24 and 24, 25 are reduced. More specifically, these distances are reduced asymmetrically, i.e. more on the side of coronary sinus 5 most adjacent to the posterior part of the mitral valve annulus 6. Thereby, the elongate body 8" is bent, as illustrated in Fig. 13, and presses the coronary sinus 5 against the mitral valve annulus 6 closing the gap 20.
Concludingly, the present invention provides a device placed in the coronary sinus, designed to reduce the dilatation of the mitral annulus. This device is at a distance from the attachment of the posterior leaflet that does not much exceed the distance at which present annuloplasty rings are placed by open surgery techniques, and the coronary sinus is along its entire course large enough to hold such a device. The device could be positioned by catheter technique or any other adequate technique and offers a safer alternative to the current open surgery methods. The device could be designed or heparincoated so as to avoid thrombosis in the coronary sinus, thus reducing the need for aspirin, ticlopedine or anticoagulant therapy.
It is to be understood that modifications of the above-described device and method can be made by people skilled in the art without departing from the spirit and scope of the invention.

Claims

CLAIMS 1. A device for treatment of mitral annulus dilatation, comprising an elongate body (8; 8'; 8") having such dimensions as to be insertable into the coronary sinus (5) and having two states, in a first of which the elongate body (8; 8'; 8") has a shape that is adaptable to the shape of the coronary sinus (5) , and to the second of which the elongate body (8; 8'; 8") is transferable from the said first state assuming a reduced radius of curvature, whereby the radius of curvature of the coronary sinus (5) is reduced as well as the circumference of the mitral valve annulus (6) , when the elongate body (8; 8'; 8") is positioned in the coronary sinus (5) .
2. A device according to claim 1, further comprising means (9; 22; 26, 27) for the transfer of the elongate body (8; 8") to the second state by bending and shortening it from a larger radius of curvature to a smaller radius of curvature.
3. A device according to claim 2, wherein said transfer means (9; 22; 26, 27) comprises means for bending and shortening the elongate body (8) by a contraction thereof.
4. A device according to claim 1, wherein the elongate body (8; 8') comprises a memory material providing the transfer to the second state.
5. A device according to claim 1 or 2 , wherein the elongate body (8) comprises a stent.
6. A device according to claim 2, wherein the elongate body (8") comprises several stent sections (23- 25) and said bending means (9; 22; 26, 27) comprises wires (26, 27) for shortening the distance between the stent sections.
7. A method of reducing the circumference of the mitral valve annulus, comprising inserting an elongate body (8; 8'; 8") into the coronary sinus (5) in the vicinity of the posterior leaflet (2) of the mitral valve, and providing a bending and shortening of the elongate body (8; 8'; 8") when positioned in the coronary sinus (5) so as to reduce the curvature of the coronary sinus (5) and thereby reduce the circumference of the mitral valve annulus (6) .
8. A method according to claim 7, wherein said bending and shortening of the elongate body (8; 8") is provided by a contraction thereof.
9. A method according to claim 7 or 8 , wherein a memory material is used in the elongate body (8') for providing the transfer to the second state.
10. A method according to claim 7 or 8 , wherein the elongate body (8") is made from several stent sections (23-25) and wires (26, 27) are used for shortening the distance between the stent sections (23-25) in order to bend the elongate body (8").
PCT/SE2000/001369 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency WO2001000111A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BR0012314-5A BR0012314A (en) 1999-06-29 2000-06-28 Device and method for treating mitral regurgitation
JP2001505828A JP4381640B2 (en) 1999-06-29 2000-06-28 Mitral valve insufficiency treatment device
EP00946661A EP1196113A1 (en) 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency
US10/019,563 US7044967B1 (en) 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency
CA002369129A CA2369129C (en) 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency
AU60386/00A AU6038600A (en) 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency
KR1020017016818A KR20020033646A (en) 1999-06-29 2000-06-28 Device and method for treatment of mitral insufficiency
US10/953,047 US7311728B2 (en) 1999-06-29 2004-09-29 Device and method for treatment of mitral insufficiency
US11/643,352 US7637945B2 (en) 1999-06-29 2006-12-20 Device and method for treatment of mitral insufficiency
US11/841,782 US7717954B2 (en) 1999-06-29 2007-08-20 Device and method for treatment of mitral insufficiency
US12/750,438 US20100185273A1 (en) 1999-06-29 2010-03-30 Device and method for treatment of mitral insufficiency

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9902455-6 1999-06-29
SE9902455A SE514718C2 (en) 1999-06-29 1999-06-29 Apparatus for treating defective closure of the mitral valve apparatus
US09/345,475 US6210432B1 (en) 1999-06-29 1999-06-30 Device and method for treatment of mitral insufficiency

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US10019563 A-371-Of-International 2000-06-28
US10/953,047 Continuation US7311728B2 (en) 1999-06-29 2004-09-29 Device and method for treatment of mitral insufficiency

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US (6) US6210432B1 (en)
EP (2) EP2135559B2 (en)
JP (3) JP4381640B2 (en)
CN (1) CN1359279A (en)
AU (1) AU6038600A (en)
BR (1) BR0012314A (en)
CA (1) CA2369129C (en)
SE (1) SE514718C2 (en)
WO (1) WO2001000111A1 (en)

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US7717954B2 (en) 2010-05-18
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US6210432B1 (en) 2001-04-03
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US20070100442A1 (en) 2007-05-03

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