more side walls 52 may be used to further minimize the risk of loss of the tissue samples the side walls may be formed as an integral unit with the collecting chamber and may be rectangular as shown or contoured to further minimize risk of loss for example the collecting chamber and side walls may be formed by removing a shaped section of the top of the collecting chamber just large enough to allow the swinging frame to come down unimpeded the pusher 24 fig4 may alternatively comprise two or more posts or wires so that the tissue sample may be more pushed with greater stability alternatively the pusher may be a pusher wall rather than a post or wire the pusher should be able to push on the tissue sample but should not be positioned such that the tissue sample is impaled upon the pusher as the tissue sample is brought down by the swinging frame to minimize the chances that an irregularly shaped tissue sample is accidentally impaled upon the pusher the tip s of the pusher may be blunt for example rounded according to one embodiment of the present invention the pusher forms a pusher basket so that as the tissue sample is pushed the chances of the tissue sample being lost are minimized fig6 a is a.