However, a new conceptual study suggests that in the future, grafts can be woven directly from synthetic yarns rather than from the patient’s own body (usually from the leg vein). It is reported that the most commonly used method in clinical treatment is to replace the coronary artery with other parts of the patient. This is not only invasive, but also fails to take into account that there are no replaceable parts in some patients. < / P > < p > in view of this, a research team from North Carolina State University (NC State) and Case Western Reserve University (CWRU) came up with a way to provide vascular grafts with bioengineering materials. In order to find this alternative, fan Zhang said that in order to find this alternative, they mixed two types of fibers into a single yarn and woven them into an artery substitute through a circular loom. One of the fibers is collagen, and the other is a synthetic fiber made of polylactic acid. When combined, the finished product can expand and contract like a human graft. < / P > < p > although not a permanent implant, the bionic stent still helps patients mobilize their own cells to reconstruct new arteries. The endothelial cells, which are usually arranged inside the artery, adhere to the stent and begin to grow. < / P > < p > compared with products using only synthetic materials, collagen can help these cells adhere to the scaffold better. The results showed that the initial cell adhesion capacity was increased by 10 times and the final cell number was increased by 3.2 times. Martin King, co-author of the study, said: “we are not designing a prototype of the final product, but adding ingredients that enable the patient to heal, and using this structure to function as a coronary artery, fibers can eventually be explained and absorbed by the human body.”. < / P > < p > these synthetic fibers can be degraded into lactic acid, which is common in human body and has low content. The main problem at present is that the material is too porous in form, leading to the passage of blood. Before the clinical trial, the research team still needs to work hard to overcome this deficiency. The report shows that the number of app store purchases soared in the first half of this year due to the impact of covid-19