Cancellous bone extractor

The utility model relates to the field of orthopedic medical instruments, in particular to a cancellous bone extractor which comprises an outer sleeve and a bone extractor, a knurled cap is arranged at the head end of the outer sleeve, the bone extractor is of a tubular structure, a bone cutting cavity is formed in the inner side of one end, extending into the outer sleeve, of the bone extractor, and the knurled cap is arranged in the bone cutting cavity. A traction part used for dragging cancellous bone is arranged on the inner wall of the bone taking cavity, and a limiting ring used for abutting against the knurled cap is arranged at the upper end of the bone taking device. According to the utility model, a working channel in a vertebral body is established through the outer sleeve, then the working channel is sent into a bone sampler for bone sampling, and in the process, a plurality of barb-shaped structures which are annularly distributed are arranged, so that a small amount of cancellous bone can still