Method for percutaneous arthroscopic disc removal, bone biopsy and fixation of the vertebrae
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United States of America Patent
Stats
-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Aug 9, 1999
filing date -
Jul 15, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The insertion points for guide pins used in percutaneous vertebral fixation by pedicle screw are determined by establishing an approach path on a CT image, measuring on the CT image the distance from the intersection of the approach path and the skin of the patient's back to the patient's midline, and marking off the corresponding distance while visualizing the patient by anteroposterior fluoroscopy. An longitudinally expansible pedicle screw comprises a shaft with bone-engaging threads on a distal portion, machine screw threads on a proximal portion, and a tubular extension having wrench-engageable holes on a proximal face, and internal threads engaging the machine screw threads on the proximal portion of the shaft. An oval cannula accommodates an arthroscope and forceps simultaneously for intervertebral disc surgery.
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