Telescopic body for an external fixation system
US6500177B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Nov 17, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/6491
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A telescopic body for an external bone fixation device includes a central core body and cylindrical outer parts having a bore extending therethrough, all disposed about a center axis. The outer surface of the core body is in the form of a keyed shaft, and the bore in the outer parts has keyways that mate with the shaft, thereby permitting the outer parts to be telescoped in a rotationally fixed, torsion-resistant fashion. Threaded drive spindles housed in the outer parts can be screwed into and out of the core body at either end, permitting the overall length of the telescopic body to be changed. Terminal elements are provided in the ends of the outer parts to limit travel of the drive spindles. At least one of the terminal elements may be a dynamic progression cap which, when progressively unscrewed, allows the axial clamping tension of the threaded spindle to be released in millimeter increments to permit relaxation of the axial clamping of the spindle. The degree of rigidity of the telescopic body as a whole is selectable by suitable choice of materials for each component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.