US4543091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray marker device
Assignee: FRONING EDWARD C P O BOX 1768 RANCHO SANTA FE CA 92067
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Filing: 1983-05-18
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Granted: 1985-09-24
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Expires: 2003-05-18
Abstract
Abstract For pre-operative radiography preparatory to stereotaxic lateral extradural disc puncture (e.g. as disclosed in U.S. Pat. No. 3,941,127) the patient is placed on his side and a radiographic film is exposed from which the surgeon calculates position and angle of needle approach to the disc before the actual operation begins. An X-ray opaque marker device similar to a ruler is located parallel and adjacent to the patient at the level of the midsaggital plane. Markings and numbers on the marker device show on the exposed film. With prolonged X-ray exposure, the image of the marker may be "burned". The present device provides a series of radiopaque shields which may be interposed between the marker and the film to reduce burn-out of the image of the marker on the film. A convenient stand supports and stores the marker and one or more shields so that they may be individually and selectively raised and turned into operative position.
Inventors
- 👤 Edward C. Froning
- 👤 Gregory S. Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:07
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/12; A61B90/00; A61B90/39; A61B90/10; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7062; Y10T403/7064; Y10T403/7066; Y10T403/7067; Y10T403/7069
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
An X-ray marker device comprising a base formed with a rectangular storage depression, a single, round rod extending upward from said base adjacent one longitudinal edge of said depression, a substantially rectangular marker shaped to fit into said depression, said marker having a cylindrical collar fixed thereto, said collar being rotatable relative to said rod and longitudinally slidable along said rod between a storage position with said marker stored in said depression and an operative position, said marker when in operative position being on the side of said rod opposite said depression, and turned 180° relative to its storage position and substantially elevated above said base, said collar having friction means on its interior, the weight of said marker causing said friction means to secure said collar and said marker against movement longitudinally of said rod; said marker being laminated, one lamina being of radiopaque material formed with cut-outs pointed at at least one end and radiopaque numerals located in said cut-outs.
Claim 2
Dependent Claim
162 words
An X-ray marker device comprising a base formed with a rectangular storage depression, a single, round rod extending upward from said base adjacent one longitudinal edge of said depression, a substantially rectangular marker shaped to fit into said depression, said marker having a cylindrical collar fixed thereto, said collar being rotatable relative to said rod and longitudinally slidable along said rod between a storage position with said marker stored in said depression and an operative position, said marker when in operative position being on the side of said rod opposite said depression, and turned 180° relative to its storage position and substantially elevated above said base, said collar having friction means on its interior, the weight of said marker causing said friction means to secure said collar and said marker against movement longitudinally of said rod; said marker being laminated, one lamina being of radiopaque material formed with cut-outs pointed at at least one end and radiopaque numerals located in said cut-outs.
Claim 3
Dependent Claim
15 words
A device according to claim 1 in which said rod slants away from said base.
Claim 4
Dependent Claim
34 words
A device according to claim 1 in which said collar has a finger grip fixed to said collar extending in a second direction from said rod and means securing said extension to said marker.
Claim 5
Dependent Claim
46 words
A device according to claim 1 which further comprises at least one radiopaque shield of approximately the same length and width as said marker; said shield being slidable along said rod independently of said marker from a lowered position to a raised selected position of adjustment.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |