Abstract: A set of surgical instruments for carpal tunnel surgery includes a group of differently-sized dilators for progressively dilating a carpal tunnel of a patient. A pair of guides is adapted to be inserted in the dilated carpal tunnel. Each of the guides has a trough defining a first longitudinal and a second longitudinal groove, and the trough is formed with a rear handle defining a cavity open to the first longitudinal groove. A group of surgical knives is each movable along the second longitudinal groove of the guide for cutting. Each of the surgical knives is provided with a shank in a zigzag configuration, and the shank has a rear end formed with a grip and a front end formed with an angled head.

Abstract: In-marrow nail structure including an in-marrow nail main body two ends of which are respectively disposed with a thread tip section and a thread tail section. A polished section is formed between the two ends. A nut is screwed on the thread tail section. The thread tip section has a tip and a large thread section for easily drilling into and engaging with the dense section of the skeleton. The length of the polished section occupies a larger part of the total length of the main body so that when thrust into the marrow, the polished section is easier to be align with the fractured portion of the skeleton. In practical pressurizing, the stress is evenly shared. The diameters of the thread tip section and the thread tail section of the main body are both larger than the diameter of the polished section so as to enhance the strength thereof.