US3821555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for alternately irradiating an object by means of at least two radiation sources
Assignee: Studsvik Energiteknik AB
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Filing: 1972-08-11
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Granted: 1974-06-28
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Expires: 1992-08-11
Abstract
Abstract This application discloses an apparatus for alternately irradiating an object by means of a radioactive source and at least one further radiation source. The sources are mounted in a holder pivotably arranged within a tubular housing being longitudinally diplaceable in a bracket and having a collimator opening, a selected source being brought into radiation position aligned with said collimator opening by turning said holder. The holder is turned by means of a longitudinal armature or permanent magnet system coupled to said holder in said housing and being pivotable around a longitudinal axis due to magnetic action at any portion of its length, said magnetic action being provided by an electromagnet arranged in connection with said bracket.
Inventors
- 👤 G Mattsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:26
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/44; A61B6/4476; A61B6/08; G; G01; G01N; G01N23/00; G01N23/02; G01N23/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
244 words
In an apparatus for selectively alternately irradiating an object by means of at least two sources of radiation and wherein at least one of said sources is a radioactive one, the combination comprising a bracket, a tubular housing having a collimator opening, said housing being longitudinally displaceable in said bracket, pivotable means arranged within said housing in connection with said collimator opening, said two radiation sources being mounted in said pivotable means such that when said pivotable means is in a first position one of said radiation sources is in radiation position aligned with said collimator opening, and when said pivotable means is in a second position the other radiation source is in radiation position aligned with said collimator opening, a magnetically operable system arranged in said housing and extending in the longitudinal direction of said housing and being pivotable around a longitudinal axis into two extreme positions due to magnetic action at any portion of its length, said magnetically operable system being coupled to said pivotable means such that one of the extreme positions of said magnetically operable system corresponds to said first position of said pivotable means and the other extreme position of said magnetically operable system corresponds to said second position of said pivotable means, and at least one electromagnet arranged outside of said housing in connection with said bracket for selectively turning said magnetically operable system by magnetic action independently of the axial position of said housing in said bracket.
Claim 2
Dependent Claim
244 words
In an apparatus for selectively alternately irradiating an object by means of at least two sources of radiation and wherein at least one of said sources is a radioactive one, the combination comprising a bracket, a tubular housing having a collimator opening, said housing being longitudinally displaceable in said bracket, pivotable means arranged within said housing in connection with said collimator opening, said two radiation sources being mounted in said pivotable means such that when said pivotable means is in a first position one of said radiation sources is in radiation position aligned with said collimator opening, and when said pivotable means is in a second position the other radiation source is in radiation position aligned with said collimator opening, a magnetically operable system arranged in said housing and extending in the longitudinal direction of said housing and being pivotable around a longitudinal axis into two extreme positions due to magnetic action at any portion of its length, said magnetically operable system being coupled to said pivotable means such that one of the extreme positions of said magnetically operable system corresponds to said first position of said pivotable means and the other extreme position of said magnetically operable system corresponds to said second position of said pivotable means, and at least one electromagnet arranged outside of said housing in connection with said bracket for selectively turning said magnetically operable system by magnetic action independently of the axial position of said housing in said bracket.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1 wherein said magnetically operable system is a permanent magnet system arranged to produce at least one longitudinal north-magnetic pole and one south-magnetic pole for interaction with poles produced by said electromagnet when energized with direct current for turning said permanent magnet system.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 2 wherein said permanent magnet system includes two permanent magnets rotatably mounted at the ends of said tubular housing and two longitudinal pole pieces connecting said permanent magnets to each other to form said longitudinal poles.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 2 wherein said electromagnet is U-shaped and partly surrounds said tubular housing.
Claim 6
Dependent Claim
29 words
Apparatus according to claim 1 and which further comprises means for bringing said pivotable means and said magnetically operable system to a neutral position between said two extreme positions.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 5 wherein said means for bringing said pivotable means and said magnetically operable system to said neutral position is constituted by a spring arrangement.
Claim 8
Dependent Claim
48 words
Apparatus according to claim 2 and which further comprises at least one iron piece fixed to said tubular housing such that the interaction between said permanent magnet system and said iron piece tends to bring said permanent magnet system to a neutral position between said two extreme positions.
Claim 9
Dependent Claim
56 words
Apparatus according to claim 2 wherein said permanent magnet system includes a longitudinal iron core symmetrically located relatively to the poles of said electromagnet when in a neutral position between said two extreme positions and wherein means are provided for supplying alternating current to said electromagnet for stabilizing said permanent magnet system in the neutral position.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 1 wherein one of said radiation sources is a source of directional light.
Claim 11
Dependent Claim
16 words
Apparatus according to claim 1 wherein both of said radiation sources are of the radioactive type.
Claim 12
Dependent Claim
47 words
Apparatus according to claim 5 and which further comprises a source of directional light arranged within said tubular housing such that a beam of light can be emitted through said collimator opening when said magnetically operable system and consequently said pivotable means are in a neutral position.
Claim 13
Dependent Claim
40 words
Apparatus according to claim 11 wherein said source of directional light is axially aligned with said colimator opening and wherein said pivotable means is provided with an opening permitting light emission when said pivotable means is in a neutral position.
Claim 14
Dependent Claim
49 words
Apparatus according to claim 11 wherein said source of directional light is arranged to be supplied with current from a coil mounted in said tubular housing, and means arranged outside of said tubular housing in connection with said bracket for producing a pulsating magnetic field passing through said coil.
Claim 15
Dependent Claim
27 words
Apparatus according to claim 13, wherein said coil is wound on a longitudinal iron core, said core being arranged to rotate together with said magnetically operable system.
Claim 16
Dependent Claim
26 words
Apparatus according to claim 13 wherein said means for producing a pulsating magnetic field includes said electromagnet and means for supplying alternating current to said electromagnet.
Claim 17
Dependent Claim
105 words
Apparatus according to claim 14 wherein said magnetically operable system is a longitudinal permanent magnet system including said longitudinal iron core, said core being symmetrically located relative to the poles of said electromagnet when in the neutral position, means being provided for supplying alternating current to said electromagnet for stabilizing said core and thus said permanent magnet system in the neutral position, said means for supplying alternating current to said electromagnet being arranged to produce a first alternating current for stabilizing said permanent magnet system in a neutral position and a second substantially higher alternating current for producing a direction light voltage in said coil.
Claim 18
Dependent Claim
60 words
An osteodensitometer comprising an apparatus according to claim 1 wherein said bracket is mounted on one arm of a fork, a radiation detector being mounted on the other arm of said fork, the object to be examined being fixed between the arms of said fork, and means being provided for displacing said fork in accordance with a predetermined scanning pattern.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |