Helical anchors are used in transcatheter mitral valve repair,The alin of the curent study was to invest igate effectof helical anchor dsign,anchored position and biting depth on the detachment force in an in vitro ep...Helical anchors are used in transcatheter mitral valve repair,The alin of the curent study was to invest igate effectof helical anchor dsign,anchored position and biting depth on the detachment force in an in vitro eperiment.Mitral annulus was excised from 36 fresh porcine hearts and mounted in an unaxdal test ng.Seven helical anchorswere made of stainles ste based on the geometric parameters outer dlameter,wire diameter,and pich Thehelical anchors were serewedin at 3 to 9 odock positions of the psteroranuhis,namely,P3-9,and puld out.The pullout fore was measured with the maximal pullout force defined as the detachment force,The detachmentforce within the medlal ateal and central positions were comparable(p≥0.069),The detachmnen force at P6was bowest compared wih the medlal and lateral positons,and was 5.459±0.193 N,5.586±0.113 N,8.910.250 for the anchos in the outer dlameters of3,4,5 mm,respectivelyat the pitch of 2 mm and thewire dlameter of.4 mm and blting depth of 3 colls The detachment force hncreased with the outer and wiredlameters but was not fected by thepichat the bitig depthof 3 cols(@≥0.279).The detachment force of thehelieal anchor is lowest in the central posterlor annulus region,and the biting depth in 3 or more coll is rec.ommended.The helical anchor is stronger than the suture.展开更多
基金The authors acknowledge financial support from the National Natural Science Foundation of China(No.51805218).
文摘Helical anchors are used in transcatheter mitral valve repair,The alin of the curent study was to invest igate effectof helical anchor dsign,anchored position and biting depth on the detachment force in an in vitro eperiment.Mitral annulus was excised from 36 fresh porcine hearts and mounted in an unaxdal test ng.Seven helical anchorswere made of stainles ste based on the geometric parameters outer dlameter,wire diameter,and pich Thehelical anchors were serewedin at 3 to 9 odock positions of the psteroranuhis,namely,P3-9,and puld out.The pullout fore was measured with the maximal pullout force defined as the detachment force,The detachmentforce within the medlal ateal and central positions were comparable(p≥0.069),The detachmnen force at P6was bowest compared wih the medlal and lateral positons,and was 5.459±0.193 N,5.586±0.113 N,8.910.250 for the anchos in the outer dlameters of3,4,5 mm,respectivelyat the pitch of 2 mm and thewire dlameter of.4 mm and blting depth of 3 colls The detachment force hncreased with the outer and wiredlameters but was not fected by thepichat the bitig depthof 3 cols(@≥0.279).The detachment force of thehelieal anchor is lowest in the central posterlor annulus region,and the biting depth in 3 or more coll is rec.ommended.The helical anchor is stronger than the suture.
