Patent ID: 6632197
Filing Date: 2003-10-14
Classification: A61B,A61M

Abstract:
A clear view cannula adapted for use by a single hand of a surgeon and configured for an arthroscopic penetration through a body wall of a patient, the clear view cannula comprising:a cannula including a tubular body having a distal end and a proximal end portion, the tubular body defining a through hole aligned with the longitudinal axis, the tubular body including a plurality of teeth members on the outer surface and extending parallel to the longitudinal axis of the tubular body, the distal end having a tapered tip adapted for making an arthroscopic portal through a body wall of a patient, a single piece handle positioned on the proximal end portion of the tubular body, the handle being adapted for readily grasping by a single hand of a surgeon; and a cylindrical sleeve having a distal end portion and a proximal end portion, the cylindrical sleeve being concentrically mounted about and slidably secured for translation relative to the tubular body, a distal edge of the distal end portion of the cylindrical sleeve being connected to the distal end of the tubular body, the cylindrical sleeve and tubular body defining a first position of the cannula, the first position being adapted for insertion through the body wall of the patient, the proximal end portion of the sleeve including a shoulder, the shoulder having a depending detent configured for selectively engaging the plurality of teeth and limiting the movement of the cylindrical sleeve relative to the tubular body, the shoulder being adapted for manipulation by the fingers of the single hand of the surgeon such that the relative positions of the tubular body and cylindrical sleeve of the cannula can be controlled by the single hand of the surgeon while gripping the handle, and the distal end portion including a plurality of shield members connected to the distal end of the tubular body, the plurality of shield members being configured for moving between the first position of the cannula parallel with the longitudinal axis and a second position of the cannula substantially perpendicular to the longitudinal axis, the cannula being adapted for manipulation by a single hand of a surgeon for the movement between the first and the second positions, the shield members being configured for bending about the mid-points upon the application of distally directed pressure upon the shoulder relative to the tubular body, the shield members in the second position being configured to improve the internal visibility through the arthroscopic portal by retracting and retaining the torn or fragmented tissue associated with the arthroscopic portal against the inner surface of the body wall.