US4034228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubus for determining the boundaries of a beam of penetrating rays
Assignee: Siemens AG
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Filing: 1975-09-29
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Granted: 1977-07-05
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Expires: 1995-09-29
Abstract
Abstract A tubus for defining the boundary of a beam of penetrating rays, which is preferably adapted for use in the radiation therapy. In a tubus of the above-mentioned type, the tube wall is thereby constructed of a plurality of over-lapping wall elements directed in parallel with the edge radiation of the radiation cone encompassed by the tubus, and suspended on the tubus housing so as to be displaceable to the direction of the edge radiation. That type of construction of the tubus facilitates the cross-section and also the surface of the focused radiation cone to be varied. Thereby it becomes possible to correlate the radiation field in a stepless manner by means of one and the same tubus over a wide range to almost every form and size of the illness spread.
Inventors
- 👤 Alfred Arauner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/10; G; G21; G21K; G21K1/00; G21K1/02; G21K1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
In a tubus for defining the boundaries of a beam of penetrating rays including a tubus housing, a plurality of mutually overlapping wall elements forming a tubus wall structure in parallel with the direction of edge radiation of a ray cone encompassed by the tubus, means for suspending the wall elements on the tubus housing for displacement perpendicular to the direction of edge radiation, the improvement comprising shaft means having a longitudinal axis for guiding and pivoting the wall elements of each tubus side for a suspension in the virtual focal point of a radiation source, the tubus having a symmetrical axis, said shaft means being supported on the tubus housing, displaceable at right angles to said longitudinal axis and extending in parallel with the tubus side associated therewith, and perpendicular to the symmetrical axis of the tubus; lever means for controlling the inclination of the wall elements with respect to the tubus symmetrical axis; and guide means for guiding said lever means.
Claim 2
Dependent Claim
163 words
In a tubus for defining the boundaries of a beam of penetrating rays including a tubus housing, a plurality of mutually overlapping wall elements forming a tubus wall structure in parallel with the direction of edge radiation of a ray cone encompassed by the tubus, means for suspending the wall elements on the tubus housing for displacement perpendicular to the direction of edge radiation, the improvement comprising shaft means having a longitudinal axis for guiding and pivoting the wall elements of each tubus side for a suspension in the virtual focal point of a radiation source, the tubus having a symmetrical axis, said shaft means being supported on the tubus housing, displaceable at right angles to said longitudinal axis and extending in parallel with the tubus side associated therewith, and perpendicular to the symmetrical axis of the tubus; lever means for controlling the inclination of the wall elements with respect to the tubus symmetrical axis; and guide means for guiding said lever means.
Claim 3
Dependent Claim
66 words
A tubus as claimed in claim 1, wherein said shaft means includes a plurality of shafts and comprising a pinion being fastened to each end of each of said shafts for parallel guidance of said shafts, respectively; and gear rack means being fastened to the sides of said tubus housing in parallel with said sides, said pinions being in cooperative engagement with said gear rack means.
Claim 4
Dependent Claim
29 words
A tubus as claimed in claim 1, each of said wall elements having one side thereof positioned exteriorly and the opposite side interiorly of a presently adjoining wall element.
Claim 5
Dependent Claim
43 words
A tubus as claimed in claim 1, each of said wall elements having an inwardly projecting ray-absorbing edge beadings at the patient-sided end thereof, said edge beading being mutually stepped for overlapping thereof in their respective spacings from the source of the radiation.
Claim 6
Dependent Claim
47 words
A tubus as claimed in claim 1, said tubus wall structure comprising angle-profiled wall elements at each of the four corners thereof for an approximately rectangular cross-section of a focusable radiation area, and at least one planar wall element located intermediate two of said angle-profiled wall elements.
Claim 7
Dependent Claim
74 words
A tubus as claimed in claim 5, comprising an angled lever being fastened to a middle wall element of each said tubus side for pivoting pursuant to said guide means being fastened to said tubus housing, a groove in said guide means extending generally perpendicular to the plane of said middle wall element, said angled lever having a free end projecting out of the plane of said wall element being guided within said groove.
Claim 8
Dependent Claim
52 words
A tubus as claimed in claim 5, comprising an odd number of planar wall elements being located intermediate two of said angle-profiled wall elements, the middle one of said planar wall elements being located externally of the side edges of the wall elements located more proximate the side edges of said tubus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |