1. A crushing instrument for temporarily closing the lumen of the intestine prior to resection.
2. A surgical instrument designed to crush the intestine and therefore obliterate its lumen (channel within a tube; such as, a blood vessel or to the cavity within a hollow organ; such as, the intestine).

Lumen is a luminous term because it is Latin for "light", including the light that comes through a window. When a hollow organ is cut across, you can see light through the space that has been opened. So the word lumen came to mean this space.