Patent US5643268A successfully refreshed from Google Patents.
US5643268A
Expired / Lapsed
US
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Fixation pin for fixing a reference system to bony structures
Assignee: BRAIN LAB MED COMPUTERSYSTEMS GmbH
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Filing: 1995-09-11
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Granted: 1997-07-01
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Expires: 2015-09-11
Abstract
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.
Inventors
- 👤 Stefan Vilsmeier
- 👤 Stefan Lippstreu
- 👤 Michael Bertram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:44
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
74 words
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.
Claim 2
Dependent Claim
74 words
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.
Claim 3
Dependent Claim
19 words
Fixation pin in accordance with claim 1, characterized in that the shaft (15) is formed from a fiber-reinforced plastic.
Claim 4
Dependent Claim
21 words
Fixation pin in accordance with claim 1, characterized in that the point (30) is ground from a sapphire or agate material.
Claim 5
Dependent Claim
32 words
Fixation pin in accordance with claim 1, characterized in that the point (30), together with the point holder (13), have a conical surface with a cone angle of approximately 50° to 70°.
Claim 6
Dependent Claim
20 words
Fixation pin in accordance with claim 1, characterized in that said conical front end (32) terminates in a spherical surface.
Claim 7
Dependent Claim
20 words
Fixation pin in accordance with claim 1 wherein said shaft has a rear end with a polygonal coupling shoulder (12).
Claim 8
Dependent Claim
22 words
Fixation pin in accordance with claim 1, characterized in that the point (30) is connected with the shaft (15) by frictional connection.
Claim 9
Dependent Claim
22 words
Fixation pin in accordance with claim 1, characterized in that the point (30) is connected with the shaft (15) by bonding material.
Claim 10
Dependent Claim
13 words
Fixation pin in accordance with claim 4 wherein the cone angle is 60°.
Claim 11
Dependent Claim
15 words
Fixation pin in accordance with claim 6 wherein said polygonal shoulder is an outer hexagon.
Claim 12
Dependent Claim
104 words
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.
Claim 13
Dependent Claim
104 words
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.
Claim 14
Dependent Claim
15 words
Fixation pin according to claim 2 wherein said plastic shaft is reinforced with glass fiber.
Claim 15
Dependent Claim
15 words
Fixation pin according to claim 2 wherein said plastic shaft is reinforced with carbon fibers.
Claim 16
Dependent Claim
22 words
Fixation pin in accordance with claim 7, characterized in that the point (30) is connected with the shaft (15) by positive locking.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |