His inventions included : a flanged tube to overcome obstructions in the gullet, a steam craniotome to open the skull in brain operations.
2.
The first craniotome was designed and created by John H . Bent, a mechanical engineer and owner of Standard Pneumatic Motor Company, under contract with Hall Air Instruments of Santa Barbara, California.
3.
Bent designed the original Craniotome around a small, lightweight, very high speed ( approximately 70, 000 rpm ) pneumatic turbine motor he had invented for use in industrial wire-wrapping tools and other air-powered hand-held devices.
4.
When Hall was subsequently acquired by 3M Company ( which was then actively developing and marketing surgical instruments ), the 3M Craniotome became widely used in neurosurgery, replacing the Gigli saw ( manually pulled saw wires ) as the primary means of opening the skull for access to the brain for surgical procedures.
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