World's smallest stent developed by scientists

Geneva (PTI): Scientists have created the world's smallest stent -- 40 times smaller than any produced to date. Stents have been used to treat blocked coronary vessels for some time now, but the urinary tract in foetuses is much narrower in comparison, said researchers from Federal Institute of Technology in Zurich (ETH Zurich), Switzerland.

About one in every thousand children develops a urethral stricture, sometimes even when they are still a foetus in the womb. In order to prevent life-threatening levels of urine from accumulating in the bladder, paediatric surgeons have to surgically remove the affected section of the urethra and sew the open ends of the tube back together again.

It would be less damaging to the kidneys, however, if a stent could be inserted to widen the constriction while the foetus is still in the womb, according to the study published in the journal Advanced Materials Technologies. It's not possible to produce stents with such small dimensions using conventional methods, which is why paediatric surgeon Gaston De Bernardis from Aargau Cantonal Hospital approached the Multi-Scale Robotics Lab at ETH Zurich. The lab's researchers have now developed a new method that enables them to produce highly detailed structures measuring less than 100 micrometres in diameter. "We've printed the world's smallest stent with features that are 40 times smaller than any produced to date," said Carmela De Marco, lead author of the study.