Apparatus for locating transverse holes of intramedullary implantates
US4621628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1984 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | Sep 6, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2034/2051
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The apparatus serves to locate transverse holes V of intramedullary implantates, especially in the distal end of implanted interlocking nails, in the fracture treatment of bones. The apparatus includes at least one magnet (13, 16) generating an axially symmetrical field, and a magnetic field detection device (8, 9) having an axial reception characteristic, with one of said two directional elements being adapted to be aligned on the axis of the transverse hole (11) to be located. The other one of said two directional elements, e.g. the magnet (13), is freely movable exteriorly, and therefore adapted to be aligned with the axis of the transverse hole. The output signals of the magnetic field detection device (8, 9) are presented on a display device (17) through a signal processing device (15). By relative displacement of the magnet (13) and of the magnetic field detection device (8, 9), the two axes thereof may be made to coincide, which state can be displayed on the display device by a zero point indication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.