Neurology department clinical percussion hammer for testing knee-jerk reaction

The invention discloses a neurology department clinical percussion hammer for testing knee-jerk reaction, wherein the neurology department clinical percussion hammer comprises a hammer head; one sideof the hammer head is welded with a hammer handle; the hammer handle comprises a first plate and a second plate, the first plate is welded with the hammer head, and a sliding groove is arranged on oneside, away from the hammer head, of the first plate; the second plate is slidingly arranged in the sliding groove, and a holding rod is welded at a part, away from the hammer head, of the second plate; the top of one side, away from the hammer head, of the first plate and the bottom of one side, away from the hammer head, of the first plate are each welded with a transverse plate; the top of eachtransverse plate is provided with a rotating hole; the two rotating holes are internally rotatingly provided with a same rotating shaft; the outer side of the rotating shaft is fixedly sleeved with agear, one side, close to th