| 摘要 |
A cutting block (1) for fixing relative to a bone for guiding a saw blade during a step in an orthopaedic surgical procedure in which the bone is cut, comprises a body (2) having a top surface (6) for guiding a saw blade, and a top plate (3) which is connected to the body and which can move between a first position in which the top plate is spaced apart from the body and a second position in which the top surface of the top plate is contiguous with and an extension of the top surface of the body. The top plate has first and second resiliently deformable arms (15, 16) extending from it, spaced apart along the top plate, and the body has first and second recesses formed in it extending substantially perpendicularly to the top surface of the body. The first and second arms on the top plate are inserted in respective ones of the recesses so that the arms and the recesses define the path for movement of the top plate relative to the body between the first and second position. Each of the recesses has a profiled surface against which the respective deformable arm acts during movement of the top plate relative to the body between the first and second positions so as to cause the arm to deform, the deformation of each of the arms being greater when the top plate is in an intermediate position between the first and second positions than when it is in each of the first and second positions, so that the top plate is biased away from the intermediate position towards the first and second positions. Biasing of the arms to the first and second positions locks the top plate in either the first or second positions. The cutting block has the advantage of easier manufacturing, particularly as the numbers of components is reduced. Furthermore, it reduces the need for welding with the attendant heat distortion that can affect the final product. The cutting block is also easier to clean. |
