Collapsible bone screw apparatus
US8308783B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2009 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Aug 7, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/864
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A collapsible bone screw for healing bone fragments across a bone fracture includes an externally threaded inner screw member and an externally threaded outer screw member. The inner screw member is initially screwed into an inner bone portion. An unthreaded portion of the outer screw member is movably joined to the inner screw member. The outer screw member is screwed until it gains purchase in an outer bone portion. As impaction occurs over time, the collapsible bone screw apparatus may shorten in length as the two screw members slide, telescope or otherwise axially move toward each other to shorten the overall length, thereby preventing any portion of the screw apparatus from protruding out of the bone. A bone screw kit of multiple inner and outer screw members are provided as well as a method of surgically fastening bone fragments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.