Surgical fixation pin tension adjuster
US4923458A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1986 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Apr 17, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/848
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A tension adjuster is mounted on and is part of an external fixation device comprising frame segments rigidly supporting fixation pins that pass through and immobilize fractured bones during rehabilitation. This tension adjuster securely attaches the fixation pins to the frame segments and adjustably applies tension along the fixation pins to more rigidly secure the fixation pins and to improve the immobilization of the fractured bones. The tension adjuster comprises a threaded slotted screw attached to the fixation pins and comprises a mounting nut having an aperture through which is drawn the threaded slotted tension screw while adjusting the tension along the fixation pins. A tapered pin extending into the aperture of the mounting nut and into a chamfered slot of the threaded slotted tension screw, guides the threaded slotted tension screw through the mounting nut during tension adjustments. A tension nut rotating upon the threaded slotted tension screw and buttressing the tension mounting nut operates by simple turning motion to draw the threaded slotted tension screw through the tension mounting nut and thereby applying tension along the fixation pins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.