| 摘要 |
<p>An orthopedic surgical instrument for arthroscopic arthroplasty of the joints of the body, adapted for insertion into the joint through a puncture wound and capable of removing degenerated cartilage and bone over an extended surface area, to a limited depth, to expose blood supply to induce growth of fibrous secondary cartilage to regenerate an articular surface. The instrument is a rotating, semi-shielded cartilage and bone abrading, suctioning instrument featuring an outer tubular sheath attached to a support and within the sheath, an inner tubular shaft; at the distal end of the inner tubular shaft, partially shielded by the outer sheath, is an abrading element that is rotated to present an abrading surface. At its proximal end, the inner tubular shaft is connected to a vacuum source for removal of tissue-carrying fluid and bone abraded from the joint surface. This fluid reaches the tubular shaft from the region of the abrading element via an inlet and a passage through an annular distal bearing which supports the inner tubular shaft, the shaft being subject to transverse loading during bone-abrading engagement. Powered means are provided to rotate the inner tubular shaft relative to the outer sheath under bone-abrading load.</p> |
