Patent ID: 8585742

Claim:
A bone fixation device for internal fixation of bone fragments, the bone fixation device having a longitudinal axis and comprising: a first plate and a second plate each having a lower surface, an upper surface, two lateral surfaces, a front surface axially intermediate between said first plate and second plate, an axially terminal surface, and at least two screw holes extending from said upper surface to said lower surface for receiving bone screws; a first guide rail and a second guide rail arranged parallel with respect to said longitudinal axis and uniaxially slideably connecting said first plate and said second plate; and at least one resilient member arranged between said first plate and said second plate, said at least one resilient member acting as a compression spring; wherein said first guide rail and said second guide rail each have a first end and a second end, the second end of the second guide rail having an interior thread penetrating therein, wherein a tension member is axially and threadedly connected to said second end of said second guide rail and axially kept at said second plate against movement toward said front surface of said second plate, and wherein the tension member is in the form of a set screw, which can be advanced in said interior thread penetrating into said second end of said second guide rail.