US3897345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength low attenuation couch top
Assignee: THERATRONICS INTERNATIONAL Ltd PO BOX 13140 413 MARCH ROAD KANATA ONTARIO CANADA K2K 2B7 A CORP OF CANADA
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Filing: 1973-09-18
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Granted: 1975-07-29
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Expires: 1993-09-18
Abstract
Abstract In the diagnosis of tumours and the like, particularly by means of X-ray radiographs and the gamma therapy of such afflicted patients'' difficulties have been encountered with prior known stretchers due to the excessive attenuation of the X-rays and the gamma ray because no suitable structural material of low cost has been discovered. Beryllium sheet, wood and plastic sheet are all suitable, but beryllium is costly; wood and plastic structures of sufficient transparency tend to deflect excessively. These prior difficulties have been further magnified when the X-ray beam has been projected obliquely to the plane of the stretcher. The present invention provides a relatively low cost structure having a greatly enhanced strength to weight ratio and a lower transparency to X-rays. The latter feature resulting in lower radiation dose to the patient than previously possible.
Inventors
- 👤 Melvin Lewis Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/04; A61B6/0407; A61B6/0442
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
9 words
A PROCESS FOR THE PRODUCTION OF AN UNSATURATED ALIPHATIC
Claim 2
Dependent Claim
9 words
A PROCESS FOR THE PRODUCTION OF AN UNSATURATED ALIPHATIC
Claim 3
Dependent Claim
249 words
A DIAGNOSTIC STRETCHER SUBSTANTIALLY TRANSPARENT TO XCARBOXYLIC ACID OR THE GROUP CONSISTING OF ACRYLIC ACID AND RADIATION WITH AN ATTENUATION EQUIVALENT TO LESS THAN 1 MM OF METHACRYLIC ACID WHICH COMPRISES PASSING A MIXTURE OF AIR OR ALUMINUM WHEN SUBJECT TO X-RAYS OF 90 KVP PASSED NORMAL OTHER GAS CONTAINING MOLECULAR OXYGEN, STEAM, AND AN UNSATUTHROUGH THE SAID STRETCHER SAID STRETCHER COMPRISING: RATED ALIPHATIC ALDEHYDE OF THE GROUP CONSISTING OF ACROLEIN FOR I. AN OUTER SKIN OF CARBON OR GRAPHITE FIBRES IN EPOXY MATRIX, THE PRODUCTION OF ACRYLIC ACID, AND METHACROLEIN FOR THE PROSAID SKIN HAVING A CONFIGURATION OF A LONG THIN AND SUBDUCTION OF METHACRYLIC ACID, INTO CONTACT AT A TEMPERATURE STANTIALLY FLAT BOARD SUITABLE FOR RECEIVING A PATIENT BETWEEN 20* AND 350*C AND AT A PRESSURE BETWEEN ATOMTHEREON AND FOR CANTILEVERED MOUNTING ON A STAND AND SPHERIC AND A SUPERATOMOSPHERIC PRESSURE OF 3 ATMOSPHERES II. A RIGID POLYURETHANE FOAM CORE WITHIN SAID SKIN SAID SKIN WITH A CATALYST CONSISTING ESSENTIALLY OF OXIDES OR OXYGENAND CORE BEING BONDED TOGETHER. CONTAINING COMPOUNDS OF THE ELEMENTS ANTIMONY, MOLYBDENUM, VANADIUM, AND TUNGSTEN, SUPPORTED ON A CARRIER MATERIAL, THE ATOMIC RATIOS OF THE ELEMENTS OF THE CATALYST WITH RESPECT TO MOLYBDENUM BEING RESPECTIVELY BETWEN 1 : 12 AND 60 : 12 FOR ANTIMONY, BETWEEN 0.5 : 12 AND 25 : 12 AND 25 : 12 FOR VANADI UM, AND BETWEEN 0.1 : 12 AND 12 : 12 FOR TUNGSTEN, AND SUBSEQUENTLY RECOVERING THE ACRYLIC ACID OR METHACRYLIC ACID FROM THE RESULTING MIXTURE.
Claim 4
Dependent Claim
249 words
A DIAGNOSTIC STRETCHER SUBSTANTIALLY TRANSPARENT TO XCARBOXYLIC ACID OR THE GROUP CONSISTING OF ACRYLIC ACID AND RADIATION WITH AN ATTENUATION EQUIVALENT TO LESS THAN 1 MM OF METHACRYLIC ACID WHICH COMPRISES PASSING A MIXTURE OF AIR OR ALUMINUM WHEN SUBJECT TO X-RAYS OF 90 KVP PASSED NORMAL OTHER GAS CONTAINING MOLECULAR OXYGEN, STEAM, AND AN UNSATUTHROUGH THE SAID STRETCHER SAID STRETCHER COMPRISING: RATED ALIPHATIC ALDEHYDE OF THE GROUP CONSISTING OF ACROLEIN FOR I. AN OUTER SKIN OF CARBON OR GRAPHITE FIBRES IN EPOXY MATRIX, THE PRODUCTION OF ACRYLIC ACID, AND METHACROLEIN FOR THE PROSAID SKIN HAVING A CONFIGURATION OF A LONG THIN AND SUBDUCTION OF METHACRYLIC ACID, INTO CONTACT AT A TEMPERATURE STANTIALLY FLAT BOARD SUITABLE FOR RECEIVING A PATIENT BETWEEN 20* AND 350*C AND AT A PRESSURE BETWEEN ATOMTHEREON AND FOR CANTILEVERED MOUNTING ON A STAND AND SPHERIC AND A SUPERATOMOSPHERIC PRESSURE OF 3 ATMOSPHERES II. A RIGID POLYURETHANE FOAM CORE WITHIN SAID SKIN SAID SKIN WITH A CATALYST CONSISTING ESSENTIALLY OF OXIDES OR OXYGENAND CORE BEING BONDED TOGETHER. CONTAINING COMPOUNDS OF THE ELEMENTS ANTIMONY, MOLYBDENUM, VANADIUM, AND TUNGSTEN, SUPPORTED ON A CARRIER MATERIAL, THE ATOMIC RATIOS OF THE ELEMENTS OF THE CATALYST WITH RESPECT TO MOLYBDENUM BEING RESPECTIVELY BETWEN 1 : 12 AND 60 : 12 FOR ANTIMONY, BETWEEN 0.5 : 12 AND 25 : 12 AND 25 : 12 FOR VANADI UM, AND BETWEEN 0.1 : 12 AND 12 : 12 FOR TUNGSTEN, AND SUBSEQUENTLY RECOVERING THE ACRYLIC ACID OR METHACRYLIC ACID FROM THE RESULTING MIXTURE.
Claim 5
Dependent Claim
16 words
A diagnostic stretcher in accordance with claim 1 wherein said outer skin additionally includes organic fibres.
References Cited (Backward Citations)
US3157787A
Cited
US3449570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |