Jason R King

US Patent:

20160367303, Dec 22, 2016

Filed:

Dec 15, 2014

Appl. No.:

15/116363

Inventors:

Ajay Mahajan - North Canton OH, US
Jason King - North Canton OH, US
Greg Norman - Wadsworth OH, US
Tim Paul - Hiram OH, US

Assignee:

The University of Akron - Akron OH

International Classification:

A61B 17/86
A61B 17/70
A61B 17/88

Abstract:

The present invention is generally directed to a reduced shock breakaway screw for use with medical implants and the like having improved solid wall geometry in the breakaway area between the upper and lower portions of the set screw. This improved geometry serves to slow down the fracturing process during shearing, thereby increasing the proportion of energy dissipated as heat from plastic deformation of the material to the amount of energy released as kinetic energy from elastic rebound.

US Patent:

20140236237, Aug 21, 2014

Filed:

Oct 4, 2012

Appl. No.:

14/349708

Inventors:

- Akron OH, US
Jason King - North Canton OH, US

Assignee:

The University of Akron - Akron OH

International Classification:

A61B 17/70
A61B 17/86

US Classification:

606270

Abstract:

A reduced shock breakaway set screw for use with medical implants and constructs for the spine having improved geometry of the groove area between the upper head portion and lower threaded portion of the set screw. The groove area of the set screw has circular and noncircular portions which in at least one embodiment comprise upper and lower radii separated by a flattened groove bottom. Other embodiments have apertures running between the groove area and an internal cylindrical bore and/or ridges or ribs running across the groove area. The improved geometry serves to slow down the fracturing process during shearing thereby increasing the proportion of energy dissipated as heat from plastic deformation of the material to the amount of energy released as kinetic energy from elastic deformation, thus reducing shock to the patient and physician without changing the preset break-off torque for the set screw.