Rotation operated delivery device

An endovascular introducer comprising in combination, a handle assembly, a stent graft deployment device and a stent graft retained on the stent graft deployment device, the handle assembly including a first part and a second part, the second part to be moved relative to the first part, the first part comprising a fixed portion to be gripped and held by a user, a rotating portion to be rotated with the fixed portion and a rotation transfer sleeve, the rotation transfer sleeve being within the rotating portion and connected to the rotating portion by a one way clutch arrangement whereby rotation of the rotating portion in a first direction transfers rotation to the rotation transfer sleeve and rotation of the rotating portion in a direction opposite to the first direction does not transfer rotation to the rotation transfer sleeve;

• the rotation transfer sleeve and the second part comprising co-acting first screw threads whereby rotation of the rotating portion of the first part with respect to the second part in the first direction transferred through the one way clutch arrangement causes relative longitudinal motion between the first part and the second part, the one way clutch assembly comprises the rotation transfer sleeve comprising a first ring of gear teeth and the rotating portion comprising a second ring of gear teeth, the first ring of gear teeth engaging with the second ring of gear teeth when the rotating portion is rotated in the first direction and the first ring of gear teeth disengaging with the second ring of gear teeth when the rotating portion is rotated in the second direction and a spring to engage the first ring of gear teeth with the second ring of gear teeth;
• the deployment device including a pusher assembly, the stent graft being mounted onto the pusher assembly and a sheath to cover the stent graft on the pusher assembly and to retain the stent graft in a compressed condition on the pusher assembly, the sheath being relatively movable with respect to the pusher assembly, the pusher assembly being connected to the first part and the sheath being connected to the second part whereby retraction of the second part with respect to the first part by the relative rotation thereof causes the sheath to be retracted at least partially from the stent graft on the pusher assembly.