Various embodiments concern a dual stage actuation flexure. Additionally, the composition can be rapidly applied on a large wound during an operation using an air gun in case of in-vivo application and shows prompt hemostasis. This exterior trim can be attached directly to a rebate of the frame and is intended to hold on this frame at least one sealing profile strip of the run channel type and a double lip seal for sealing against the bodyshell, the trim comprising a portion for clamping onto the rebate which has a substantially U-shaped cross section with two longitudinal axial legs. According to the present invention, the output of optical channels can be adjusted to be flat or as desired without deteriorating signal to noise ratio.