Patent ID: 8728058

Claim:
A telescopic device comprising a first telescopic member and a second telescopic member, where the second telescopic member is displaceably arranged within the first telescopic member so that the second telescopic member can be moved in a first and a second axial direction along the longitudinal axis of the first telescopic member, a coupling arrangement for limiting displacement of the second telescopic member relative to the first telescopic member, the coupling arrangement comprising; a coupling member having an inner lumen and an external surface, the external surface including a central area, a first tapered surface proximal to the central area tapered to converge in the first axial direction, a second tapered surface distal to the central area tapered to converge in the second axial direction: and a coupling ring attached to the external surface of the coupling member; wherein a first coupling configuration of the coupling arrangement limits the displacement of the second telescopic member in the first axial direction and permits displacement of the second telescopic member in the opposite second axial direction.