PEDICLE DEPTH MEASURING APPARATUS

摘要

A pedicle depth measuring apparatus comprises an outer tubular member comprising a first end and a second end. A head member is joined to the second end. The head member comprises a base surface comprising an opening. An inner member is slidable within the outer tubular member. The inner member comprises a first end and a second end, the second end being slidable through the opening. The second end further comprises a marker disposed at a distal end. The marker comprises a material that is radiographically distinguishable, in which a placement of the marker within a cannulation of a patient's pedicle is observable. An indicator member is operable for indicating a distance between the marker and the base surface, in which the distance indicates a choice of a size of a pedicle screw to be installed for mitigating damage to the patient's nerve root.

主权项

1. A pedicle depth measuring apparatus comprising:
an outer tubular member comprising a first end and a second end; a head member being joinable to said second end, said head member comprising a base surface comprising an opening; an inner member being configured for slidable movement within said outer tubular member, said inner member comprising a first end and a second end, said second end being configured for slidable movement through said opening, said second end further comprising a marker disposed at a distal end of said second end, said marker comprising a material being radiographically distinguishable from said second end, in which a placement of said marker within a cannulation of a patient's pedicle is observable; and an indicator member being operable for indicating a distance between said marker and said base surface, in which said distance indicates a choice of a size of a pedicle screw for mitigating damage to the patient's nerve root upon insertion of the pedicle screw into the cannulation.