Part-I - Controller General of Patents Designs and Trademarks

(12) PATENT APPLICATION PUBLICATION (21) Application No.2523/MUM/2010 A
(19) INDIA
(22) Date of filing of Application :13/09/2010 (43) Publication Date : 21/06/2013
(54) Title of the invention : STENTS WITH LOW STRUT THICKNESS AND VARIABLE STRUT GEOMETRY
(51) International classification
(31) Priority Document No :NA
(32) Priority Date :NA
(33) Name of priority country :NA
:A61F2/90;
A61F2/915
(86) International Application No
:NA
Filing Date
:NA
(87) International Publication No : NA
(61) Patent of Addition to Application Number :NA
Filing Date
:NA
(62) Divisional to Application Number
:NA
Filing Date
:NA
(71)Name of Applicant :
1)MERIL LIFE SCIENCES PVT. LTD.
Address of Applicant :KALPDEEP, PLOT NO. 147, H-1
CHARWADA ROAD, GIDC VAPI, VALSAD,
GUJARAT(GJ)- 396 195, INDIA,(IN) Gujarat India
(72)Name of Inventor :
1)VYAS, RAJNIKANT GANDALAL
2)THAKOR, UTPAL DEVENDRA
(57) Abstract :
The invention disclosed herein is a balloon expandable metallic stent with low and uniform strut thickness for implantation in a
body lumen such as artery. The stent consists of variable geometry of scaffold structure consisting of cells with open and closed
configuration across its axial length to impart differential mechanical strength to different parts. The closed cell configuration is
stronger than the open cell configuration and hence offers more resistance to radial expansion than the open cell configuration.
The stent is divided into distinct sections of rows of closed and open cells. By providing closed cells in the end portions and open
cells in the central portion of a stent, the dog-boning effect can be eliminated. Other configurations can be created by making only
one end section of the stent with closed cells or no section with closed cells. The thickness of the stentmade from cobaltchromium
alloy L-605 could be reduced to as low as 35 microns with adequate radial strength as well as fatigue resistance. The
stent with thinner struts and elimination of dog-boning effect are known to reduce arterial injury.
No. of Pages : 35 No. of Claims : 16
The Patent Office Journal 21/06/2013 13591