Senn's bone-plates

[Nicholas Senn, Chicago surgeon of Swi birth, 1844-1908.] Plates of decalcified bone employed in intestinal anastomosis. S.'s test, for perforation of the bowel; after the abdomen is opened hydrogen gas is injected into the rectum, and then a light held near the coils of intestines will reveal a perforation through ignition of the escaping gas.