Small changes in design can sometimes produce dramatic changes in an instrument's performance and perception. Beau sabreur surgeons may rest assured this instrument is not just another "Chomp" through a Thoracic Park. With cup sizes commonly offered as small as 4 mm, a T-Lex™ is a very precise instrument.

In the family of double articulating rongeurs for performing laminectomies, a whole closet full of nine-inch or better, patterns loosely bear the classifying name ascribed to Lars Leksell, M.D. who popularized the basic design. Inspired by history, Buxton has reached back in time to reintroduce the Leksell pattern with a new twist in design and function.

Affectionately nicknamed the Tyrannosaurus Lex, this instrument features the familiar strong, forward-angled jaws. However, we have reengineered the straight squeezing arm to kick out 60° - rather than the standard 30° - from the plane of the central axis established by the alignment of the articulating screws. The curved counterpart follows obediently through a sweeping arc so that the grip is still the same; only now the ergonomics are improved and the surgeon finds his hand is less likely to be in his own line of vision. Modifying the instrument also tends to alter the angle of attack to a more nearly perpendicular approach and the operator soon realizes the powerful jaws of these rugged rongeurs cut through bone and softer tissue with the strength and surety of their carnivorous namesake.

To attain the smoothest possible action, we have avoided the temptation to use a single return spring. Unilateral springs either slide, or in some cases roll, on a small wheel in a groove milled into the medial surface of the opposite arm. These springs notoriously grind their way through the opening and closing process. At first, resistance is light and barely noticed. Regular lubrication provides temporary relief, but its staccato-like effect is recurrent and relentless in squeezing stroke after squeezing stroke.

The Tyrannosaurus Lex, as with all of our double articulating rongeurs, features only paired springs with a ball-socket interface. We have taken the trouble to 'fit' the springs to flex in synchronization with the handle to achieve smooth counter pressure through the range of handle motion.

Talking Back, vol. 1, no. 3