Abstract: A modular safety ladder system for climbing trees is provided, comprising a single support member having a lower end and an upper end; a bottom step attached to the lower end; a top step attached to the upper end; an intermediate step attached to the support member between the bottom step and the top step; a flexible strap attached to the support member for suspending the ladder module from the tree, wherein the strap is placed in tension when weight is exerted on the ladder module; first and second stabilizers attached to the upper end and the lower end of the support member, respectively, for stabilizing the ladder module against the tree, wherein the first and second stabilizers include surfaces which are caused to forcibly contact the tree when the strap is placed in tension; and a safety loop connected to the strap for allowing a secure attachment between the strap and a coupling device on the climber, wherein the safety loop is constructed in a manner to support the weight of the climber.

Abstract: A portable safety ladder for climbing trees is provided, comprising a single primary support member having first step; a single secondary support member having a second step, wherein the secondary support member is slidable relative to the primary support member; a locking mechanism operatively disposed between the primary support member and the secondary support member for selectively locking the position of the secondary support member relative to the primary support member; a single flexible strap on the primary support member for suspending the ladder module from the tree, wherein the flexible strap is placed in tension when weight is exerted on the ladder module; first and second stabilizers attached to the primary support member and the secondary support member, respectively, for stabilizing the ladder module against the tree, wherein the first and second stabilizers include surfaces which are caused to forcibly contact the tree when the flexible strap is placed in tension; and a safety loop connected t

Abstract: A portable ladder module is provided, comprising a primary support member having a first step; a secondary support member having a second step, wherein the secondary support member is slidable relative to the primary support member. A lock is operatively disposed between the primary support member and the secondary support member for selectively locking the position of the secondary support member relative to the primary support member in an extended position and a retracted position. A strap having a quick-release buckle is secured to the primary support member for holding the ladder module to a tree, and a pair of rigid tubing members on each of the primary support member and the secondary support member are present for stabilizing the ladder module against the tree. Preferably, a third step is provided on either the primary or the secondary support member, depending upon the nature of the sliding relationship between the primary and secondary support members.

Abstract: A modular ladder system for climbing trees is provided, comprising an upper assembly and a lower assembly, wherein the lower assembly is slidable relative to the upper assembly; wherein the upper assembly includes a first pair of support members attached to one another by a top step, and wherein the lower assembly includes a second pair of support members attached to one another by a bottom step; a locking device operatively disposed between the upper assembly and the lower assembly for selectively locking the position of the lower assembly relative to the upper assembly in an extended position and a retracted position; an attachment device on the upper assembly for attaching the ladder module to a tree; and a stabilizer on the upper assembly and the lower assembly for stabilizing the ladder module against the tree.

Abstract: An osteotomy guide and surgical kit for performing a tibial osteotomy are provided, wherein the osteotomy guide comprises two or more rows of guide holes formed therethrough for attaching the guide onto a pair of guide pins in a predetermined relation to a tibia; a transverse slot, defining a transverse cutting plane; and a plurality of oblique slots angularly offset from the transverse slot, each oblique slot defining an oblique cutting plane. Additional features of the surgical kit include a transverse member adapted to pass through the transverse slot, which can be either a modified saw blade or a separate removable plate, and a locking device on the osteotomy guide for lockably engaging the transverse member and positioning the osteotomy guide at a predetermined location relative to the transverse member. A measurement guide hole is also provided in the same plane as the transverse slot so that accurate measurement of the tibial depth can be accomplished.

Abstract: A modular ladder system for climbing trees is provided, comprising an upper assembly having a first pair of support members attached to one another by a top step; a lower assembly having a second pair of support members attached to one another by a bottom step; a central assembly having a third pair of support members and a third step, wherein the upper and lower assemblies are independently slidable relative to the central assembly; a first lock between the upper assembly and the central assembly for selectively locking the position of the upper assembly relative to the central assembly in an extended position and a retracted position; a second lock between the lower assembly and the central assembly for selectively locking the position of the lower assembly relative to the central assembly in an extended position and a retracted position; an attachment device on the upper assembly for attaching the ladder module to a tree; and a stabilizer on the upper assembly and the lower assembly for stabilizing the lad