a medical shaft instrument includes an instrument head with at least one jaw member for applying clamps with two jaw member branches . the instrument head is connectable over an instrument shaft having an outer tube with a handle for actuation of the jaw member . a clip magazine includes a retaining rail for supporting clamps in a predetermined storage position distance from each other . all the clamps are advanceable by a forth and back movable conveying and advancing rail . the clamp closest to the instrument head is conveyable by a tongue into the jaw member between the jaw member branches . the retaining rail has a distally extending support plate or bridge , which covers a jaw member region of a jaw member branch on the other jaw member branch facing side such that a tipping of an advanced or advanceable clamp on the jaw member branch is prevented .