Blue Sail Medical has been granted a patent for a radially expandable stent with improved strength and reduced foreshortening properties. The stent features a mixed configuration of straight and arcuate connector segments, providing resistance to flip deformation while maintaining flexibility. The patent also includes a method for manufacturing the stent. GlobalData’s report on Blue Sail Medical gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Blue Sail Medical, expandable microsphere foams was a key innovation area identified from patents. Blue Sail Medical's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
A patent granted for a radially expandable stent with mixed configuration
A recently granted patent (Publication Number: US11648136B2) describes a method for manufacturing a radially expandable stent for insertion into a body vessel. The stent is designed with a tubular body consisting of a series of annular segments with a zig-zag shape, forming peaks and valleys. The stent includes a distal end and a proximal end, with at least two annular segments positioned internally between them. The annular segments are connected by straight connector segments, with exactly three connector segments between the end annular segments and their adjoining internal segments. Additionally, at least 90% of the connector segments between the internal annular segments are arcuate.
The patent also specifies that the peaks and valleys of the annular segments can be either 180° out of phase or in phase with the adjacent annular segment. In the former case, the peaks of a first and third annular segment extend toward a second annular segment positioned between them and are aligned longitudinally with the valleys of the second annular segment. In the latter case, the peaks of a first and third annular segment extend toward a second annular segment positioned between them and are aligned longitudinally with the peaks of the second annular segment.
The method further includes positioning the straight connector segments equidistant from each other along the circumference of the tubular body. The patent also mentions that the flip force required to catastrophically deform the stent should be greater than 0.2 newtons. The tubular body of the stent is made of metal, specifically a cobalt chromium alloy. Additionally, the stent may have a drug eluting coating, with rapamycin or a 40-O derivative of rapamycin being mentioned as potential options.
The dimensions of the radially expandable stent can be tailored to support either a coronary artery or a peripheral artery. This patent provides a detailed method for manufacturing a stent with specific design features, such as the zig-zag shape of the annular segments and the use of straight and arcuate connector segments. The inclusion of a drug eluting coating and the choice of a cobalt chromium alloy for the stent material further enhance its potential applications in medical procedures.