Fixation pin for fixing a reference system to bony structures
First Claim
1. Fixation pin (10) for fixing a reference system, especially a head ring for stereotactic treatment, to bony structures witha shaft (15) made of a plastic material withan outside thread (11),a coupling shoulder (12) for a screwdriver, anda point holder (13), and witha point (30) with a conical front end (32) held by the point holder (13) characterized in thatthe point (30) is made of a semiprecious stone material.
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Accused Products
Abstract
The present invention pertains to a fixation pin for fixing a reference system, especially a head ring for stereotactic treatment, to bony structures, which pin has a shaft made of plastic material with an outside thread, a coupling shoulder for a screwdriver and a point holder, and it has a point, which is held by the point holder. The point has a conical front end, in which case the point is made of a semiprecious stone material.
211 Citations
14 Claims
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1. Fixation pin (10) for fixing a reference system, especially a head ring for stereotactic treatment, to bony structures with
a shaft (15) made of a plastic material with an outside thread (11), a coupling shoulder (12) for a screwdriver, and a point holder (13), and with a point (30) with a conical front end (32) held by the point holder (13) characterized in that the point (30) is made of a semiprecious stone material.
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11. In combination with a head ring for stereotactic treatment having vertical posts, a fixation pin for fixing the head ring to bony structures, comprising a shaft made of plastic material having an outside thread threadedly engaged with said vertical post of the head ring, a coupling shoulder for driving engagement with a driver member operable to rotate said shaft within said post, and a point holder at one end of said shaft, a point removably engaged in said point holder, said point being made of semiprecious stone material and operable to be advanced to engage the bony structures by rotation of said shaft post.
Specification