Bone screw comprising a device for electrostimulation
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United States of America Patent
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Aug 17, 2004
Grant Date -
N/A
app pub date -
May 10, 2002
filing date -
Jun 23, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Bone screw (10a) having a hollow, tubular shaft (12a) consisting of metal, such as titanium, the shaft having a head (14a) at one end and a self-tapping external thread (18a) at the other end. The head (14a) has a hexagonal recess (16a) for inserting a turning tool. An electrically insulated metallic end-piece (20a) which tapers in the direction of the end in the form of a cone or pointed arch, is inserted the other end of the shaft (12a). A receiving coil (30a) is located in the hollow shaft (12a), the terminals (36a, 38a) of the coil being electrically coupled to the shaft (12a) and to the end-piece (20a). The space between the end-piece (20a) and the end of the shaft (12a) as well as the interior of the shaft (12a) are filled with a biocompatible insulating compound (26a), such as an epoxy resin. A low-frequency electric voltage can be induced in the receiving coil by an external primary coil which is coupled to an oscillation generator. The electric voltage generates a growth-promoting current in the surrounding tissue, the shaft and the end-piece acting as tissue electrodes (stimulation method according to Kraus and Lechner).
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