Patent ID: 8702713
Filing Date: 2014-04-22
Classification: A61B

Abstract:
1. An instrument for adjusting relative positioning of at least two vertebrae, comprising: a first end member including a guide bar and a displacement member extending therefrom, said displacement member includes an externally threaded portion; a second end member configured to engage with said guide bar and said displacement member, said second end member further including an engaging member selectively engageable with said displacement member, said engaging member includes an elongated passage in which a portion of said externally threaded portion is received, said elongated passage including an upper portion and a lower portion including a plurality of rounded projections configured to engage with threading of said externally threaded portion when said engaging member is engaged with said displacement member, said second end member further includes a biasing member configured to normally bias said engaging member into engagement with said displacement member such that said plurality of rounded projections engage with said threading and prevent displacement of said second end member relative to said first end member without rotation of said displacement member; and wherein said second end member is movable relative to said first end member along said guide bar and said displacement member upon rotation of said displacement member relative to said first end member when said engaging member is engaged with said displacement member and independent of rotation of said displacement member relative to said first end member when said engaging member is disengaged from said displacement member.