Anterior posterior headblock
US4765317A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1987 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Jan 12, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F5/055
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Widely adjustable anterior posterior headblock in a halo vest fixation system of graphite and other material for fixation of a head about an orthopedic jacket with respect to the cervical region, such as for spinal trauma. A slotted adjustment carrier member with ball, sockets and clamping screws at each end of the carrier fits over and between pairs of upright rods. Clamping screws and a slot in the carrier member provide for anterior and posterior movement of a saddle and an attached vertically aligned halo ring traction plate to position an attached halo ring. The halo ring traction plate moves vertically in a slot via an independent-acting, internally-captured adjustment screw to provide for vertical traction or distraction as applied to the halo ring. The halo ring rotates pivotally about a pitch axis to provide for flexion or extension adjustment of the halo ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.