Source: http://www.google.co.uk/patents/US20020087173
Timestamp: 2016-07-27 23:13:21
Document Index: 544301442

Matched Legal Cases: ['art 10', 'art 10', 'art 10', 'art 10', 'art 10', 'art 10', 'art 10', 'art 10']

Patent US20020087173 - Mitral valve constricting device, system and method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA device, system and method for treating a mitral valve is disclosed. The device is implantable in the coronary sinus of the heart to partially encircle the mitral valve annulus. The device is elongated, is resilient, and has a preformed arched configuration. When the device is implanted in the coronary...http://www.google.co.uk/patents/US20020087173?utm_source=gb-gplus-sharePatent US20020087173 - Mitral valve constricting device, system and methodAdvanced Patent SearchPublication numberUS20020087173 A1Publication typeApplicationApplication numberUS 09/751,271Publication date4 Jul 2002Filing date28 Dec 2000Priority date28 Dec 2000Also published asCA2433672A1, CA2433672C, DE60137724D1, EP1395182A2, EP1395182A4, EP1395182B1, US7591826, WO2002053206A2, WO2002053206A3Publication number09751271, 751271, US 2002/0087173 A1, US 2002/087173 A1, US 20020087173 A1, US 20020087173A1, US 2002087173 A1, US 2002087173A1, US-A1-20020087173, US-A1-2002087173, US2002/0087173A1, US2002/087173A1, US20020087173 A1, US20020087173A1, US2002087173 A1, US2002087173A1InventorsClifton Alferness, David KayeOriginal AssigneeAlferness Clifton A., Kaye David M.Export CitationBiBTeX, EndNote, RefManPatent Citations (28), Referenced by (239), Classifications (5), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMitral valve constricting device, system and method
DETAILED DESCRIPTION OF THE INVENTION [0025] Referring now to FIG. 1, it is a superior view of a human heart 10 with the atria removed to expose the mitral valve 12 and coronary sinus 14 of the heart 10 to lend a better understanding of the present invention. Also generally shown in FIG. 1 are the pulmonary valve 22, the aortic valve 24, and the tricuspid valve 26 of the heart 10. [0026] More specifically, the mitral valve 12 includes an anterior cusp 16, a posterior cusp 18 and an annulus 20. The annulus encircles the cusps 16 and 18 and maintains their spacing to provide a complete closure during a left ventricular contraction. As is well known, the coronary sinus 14 partially encircles the mitral valve 12 adjacent to the mitral valve annulus 20. As is also known, the coronary sinus is part of the venus system of the heart and extends along the AV groove between the left atrium and the left ventricle. This places the coronary sinus essentially within the same plane as the mitral valve annulus making the coronary sinus available for placement of the mitral valve therapy device of the present invention therein. [0027] [0027]FIG. 2 shows a mitral valve therapy device 30 embodying the present invention in position within the coronary sinus 14 of the heart 10. As may be noted in FIG. 2, the device is elongated and has an arched configuration. The device also at least partially encircles the mitral valve 12 adjacent to the mitral valve annulus 20. The device 30, by virtue of having an unstressed preformed arched radius smaller than the radius of the dilated mitral valve annulus 20, imparts an inward, generally radial force designated by arrows 32, on the mitral valve annulus 20. This force returns the mitral valve annulus 20 to its original or substantially original geometry to permit the cusps 16 and 18 to more fully come together for sealing the left atrium during left ventricular contraction. [0028] The device 30 has a cross section dimension to be received by the coronary sinus. It is preferably formed of a resilient material to permit the device to be straightened and/or bent for being advanced into the coronary sinus. After being positioned as illustrated, the device is permitted to assume its preformed arched configuration to act upon the mitral valve annulus as previously described. To that end, the device may be formed of, for example, Nitinol, a nickel titanium alloy, well known in the art. This material, as is well known, is capable of being preformed but manipulated to be straight or partially bent while having sufficient memory to return to its preformed configuration. In order to be received within the coronary sinus, the device may have a cross sectional dimension of, for example, on the order of four or five french. [0029] FIGS. 3-6 illustrate a manner in which the mitral valve therapy device may be implanted within the coronary sinus 14 in accordance with a preferred embodiment of the present invention. Referring initially to FIG. 3, an elongated flexible sheath 32 is first introduced into the heart 10 through the superior vena cava 11 into the right atrium 13, and to and through the coronary sinus ostium 15. The sheath 32 is then further advanced into the coronary sinus 14. Advancement of the sheath 32 continues until the distal end 34 of the sheath 32 reaches or slightly enters the great cardiac vein 17. The sheath 32 preferably takes the form of a double-wound polyester catheter. The sheath is dimensioned for receiving the mitral valve therapy device 30 and the introducer 36. To that end, the sheath may have an inner diameter dimension of six french or greater. [0030] The distal end of the introducer 36 and the proximal end of the therapy device 30 each include coupling mechanisms forming a releasable coupling arrangement 38. The coupling arrangement 38 will be described in greater detail subsequently with reference to FIGS. 5 and 6. [0031] The introducer 36 as will be noted in FIG. 3 is elongated and has a diameter dimension similar to the cross sectional dimension of the device 30. The introducer is also flexible. It may be formed of, for example, stainless steel. [0032] Once the sheath 32 is positioned within the heart 10 as illustrated in FIG. 3, the proximal end of the device 30 is coupled to the distal end of the introducer 36. The device 30 and introducer 36 are then fed into the sheath 32. As the device 30 is advanced through the sheath 32 by moving the introducer 36 relative to the sheath 32, the device 30 and introducer 36 follow the path defined by the sheath 32. When the distal end of the device 30 reaches or is near the distal end 34 of the sheath 32, the advancement of the introducer 36 and device 30 is terminated. [0033] The next step is the partial retraction of the sheath 32. This may be best seen in FIG. 4. The sheath 32 is pulled back while the introducer 36 is held stationary. This continues until the distal end 34 of the sheath 32 is proximal to the coupling arrangement of the device 30 and the introducer 36. [0034] Referring to FIGS. 5 and 6, the coupling arrangement 38 includes a coupling interlock mechanism 40 at the proximal end of the mitral valve therapy device 30 and a complimentary interlock mechanism 42 at the distal end of the introducer 36. After the sheath 32 is retracted where the distal end 34 of the sheath 32 is proximal to the coupling arrangement 38 as seen in FIG. 4, rotation of the sheath and introducer relative to the device 30 releases the introducer 36 from the device 30. The sheath 32 and introducer 36 may now be completely retracted from the patient's heart 10. This leaves the mitral valve therapy device 30 in place within the coronary sinus to act upon the mitral valve annulus to return the mitral valve to a proper sealing function during left ventricular contraction. [0035] [0035]FIG. 7 shows the mitral valve therapy device 10 in a stressed condition. The dashed line 44 illustrates the degree of arcuate shifting of the device 30 towards its preformed unstressed state. When first implanted, the device 30 will have a radius of curvature which is greater than its preformed radius of curvature by virtue of the resistance to the device imposed by the heart anatomy. The device, in seeking to migrate to its preformed unstressed state indicated by the dashed line 44, exerts the aforementioned radially inward force on the mitral valve annulus. [0036] [0036]FIG. 8 is another view of the heart 10 illustrating the mitral valve therapy device 30 in position within the coronary sinus 14. Here, it may be seen that the device 30 includes a proximal end 46 and a distal end 48. The length of the device 30 is selected so that the included angle theta (θ), defined by the proximal end 46 and distal end 48 together with the center 50 of the mitral valve 12, is preferably greater than 180�. Selecting such a length for the device 30 will assist in the device 30 being held in place and promote a uniform radial force on the mitral valve. [0037] The mitral valve therapy device 30 illustrated in FIGS. 2-8 has sufficient length to project through the coronary sinus ostium into the right atrium so that the proximal end 46 of the device 30 is proximal to the coronary sinus ostium. The device 30 may include additional fixation to hold the device 30 in place. To this end, FIG. 9 shows a fixation element 52 at the proximal end of the mitral valve therapy device 30. The fixation element 52, in accordance with this preferred embodiment, takes the form of a polyester mesh 54 bound to the inner surface of the device 30. This serves to grip heart tissue, such as the right atrial or coronary sinus wall, to maintain the device 30 in its implanted desired position. Alternatively, as shown in FIG. 10, the fixation may be provided by a plurality of teeth 56 formed in the inner surface of the device 30. This alternative arrangement will also provide a gripping action to maintain the device in its proper position. [0038] As can thus be seen from the foregoing, the present invention provides a new an improved device, system and method for treating mitral regurgitation. The device may be employed with only percutaneous techniques. This allows the patient to receive therapy much sooner in the mitral regurgitation progression than previously available with prior art techniques. The cost of the therapy will also be comparatively low making the therapy more generally available. Further, the mitral valve therapy device may be implanted by any noninvasive cardiologist, again lending to the general availability of the therapy. Still further, the device may be readily removed in the event that the therapy is unsuccessful or adjustment is necessary. Lastly, since the heart remains intact and fully functional throughout the procedure, the effectiveness of the therapy may be immediately deduced for optimized adjustment. [0039] While particular embodiments of the present invention have been shown and described, modifications may be made, and it is therefore intended in the appended claims to cover all such changes and modifications which fall within the true spirit and scope of the invention. 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LTD., WASHINGTONFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CARDIAC DIMENSIONS, INC.;REEL/FRAME:032759/0069Effective date: 20140411RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services