A medical device, comprising: a bendable portion comprising a plurality of pivot members (126f, 226f) that are arranged in succession and a related plurality of pivot assemblies that pivotally connect adjacent ones of the plurality of pivot members; a first slat assembly extending along the bendable portion; and a second slat assembly extending along the bendable portion; wherein each of the first slat assembly and the second slat assembly is configured to push when the other of the first slat assembly and the second slat assembly pulls so as to cause the bendable portion to bend; wherein the pivot members comprise an alternating succession of inner links and outer links and wherein adjacent ones of the inner and outer links are overlapped relative to one another, each pivot member defining an opening; characterised in that each of the inner and outer links comprises a male tab (171, 291) at one end and a female slot (172, 292) at an opposite end; wherein adjacent ones of the inner links are connected to one another by the male tab of one inner link and the female slot of the adjacent inner link and wherein adjacent ones of the outer links are connected to one another by the male tab of one outer link and the female slot of the adjacent outer link, and wherein at least one of the male tabs of the inner links and the male tabs of the outer links comprises a tab neck (221, 222) having a predetermined shape and size, and wherein a slot opening (182, 222) of a female slot of an adjacent connected link has a predetermined shape and size adapted to restrict a relative movement between the two adjacent links. a bendable portion comprising a plurality of pivot members (126f, 226f) that are arranged in succession and a related plurality of pivot assemblies that pivotally connect adjacent ones of the plurality of pivot members; a first slat assembly extending along the bendable portion; and a second slat assembly extending along the bendable portion; wherein each of the first slat assembly and the second slat assembly is configured to push when the other of the first slat assembly and the second slat assembly pulls so as to cause the bendable portion to bend; wherein the pivot members comprise an alternating succession of inner links and outer links and wherein adjacent ones of the inner and outer links are overlapped relative to one another, each pivot member defining an opening; characterised in that each of the inner and outer links comprises a male tab (171, 291) at one end and a female slot (172, 292) at an opposite end; wherein adjacent ones of the inner links are connected to one another by the male tab of one inner link and the female slot of the adjacent inner link and wherein adjacent ones of the outer links are connected to one another by the male tab of one outer link and the female slot of the adjacent outer link, and wherein at least one of the male tabs of the inner links and the male tabs of the outer links comprises a tab neck (221, 222) having a predetermined shape and size, and wherein a slot opening (182, 222) of a female slot of an adjacent connected link has a predetermined shape and size adapted to restrict a relative movement between the two adjacent links.