The aim of the Panagenesi project is to optimize the rooting of islands in the transplant site through the use of fibrin variable circular section scaffolds, consequently reducing the number of pancreatic islands necessary for the transplant’s full success and prolongation of their function over time.
The scaffold is essentially a tubular textile article with a small diameter, comprising a sequence of lobed structures (narrowed sections alternating with broader sections), with a variable cross-section and three-dimensional type internal structure (internal criss-crossing), produced using fibrin yarns.
For the manufacture of the tubular textile, Comez has designed an innovative electronic double needle bar warp knitting machine, with a working width of 800mm, in gauge 20 (needles per inch), with 8 knitting bars for independently controlled pattern making. The knitting bars, finished product take-down and yarn feeders, are all controlled by versatile electronic actuators which are said to provide excellent dynamic performance and positioning accuracy.
New fields of application for warp knitting
According to machine builder Comez, the machine opens up new fields of application for warp knitting technology by applying the most advanced mechanical and electronic technologies, being capable of operating at a very high accuracy rate, by processing yarns of various types, structure and composition and by having a sophisticated construction design, whilst being flexible in its operation and versatile in the multiple textile structures it can create.
The machine is said to be especially suited for the production of complex articles that can find applications in a variety of medical/hospital fields and in technical and industrial sectors in general.
The double needle bar machine can create spacer (3D) fabrics comprising two external fabrics forming the two faces of the fabric itself, bound by an internal structure. The possibility of distancing the two needle bars allows for the gap between the two external fabrics to be increased or decreased.
The variability of the circular section 3D tubular article for the Panagenesi project is obtained by modifying the interlacing movement which constitutes the fabric’s structure and by varying the feeding of the yarns and number of stitches per centimetre. The positive feeding of the yarns allows for the processing of very fine yarns such as those made from fibrin where very little resistance to mechanical action is encountered.Source. http://www.knittingindustry.com/articles/1078.php