US4585941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dosimetry system for strontium-rubidium infusion pump
Assignee: Bracco International BV
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Filing: 1983-02-28
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Granted: 1986-04-29
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Expires: 2003-02-28
Abstract
Abstract The dosimetry system used with a strontium-rubidium infusion system is a very high speed circuit capable of measuring the radioactive dosage infused into a patient in real time. The dosimetry system is capable of receiving very short duration input pulses generated by a photomultiplier tube in response to the presence of radioactivity.
Inventors
- 👤 Brian C. Bergner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/1407; A61M5/142; A61M5/145; A61M5/1452; A61M5/168; A61M5/16804; A61M5/16827; A61M5/172; G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/203; G21; G21G; G21G1/00; G21G1/0005; A61M2205/00; A61M2205/05; A61M2205/051; A61M5/007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A dosimetry system for a strontium-rubidium generator comprising: (a) a photomultiplier tube, having a face through which input signals in the form of light are received; (b) a plastic scintillator mounted on said face; (c) means for reflecting back into said tube any light which scintillates from the plastic scintillator; (d) means for preventing stray light from striking said plastic scintillator; and (e) a single channel analyzer electrically connected to said photomultipler tube for receiving pulses from said photomultiplier tube, said single channel analyzer comprising a very high speed comparator which receives input pulses from said photomultipler tube including means for analyzing input pulses having pulse widths of significantly less than 50 nanoseconds.
Claim 2
Dependent Claim
113 words
A dosimetry system for a strontium-rubidium generator comprising: (a) a photomultiplier tube, having a face through which input signals in the form of light are received; (b) a plastic scintillator mounted on said face; (c) means for reflecting back into said tube any light which scintillates from the plastic scintillator; (d) means for preventing stray light from striking said plastic scintillator; and (e) a single channel analyzer electrically connected to said photomultipler tube for receiving pulses from said photomultiplier tube, said single channel analyzer comprising a very high speed comparator which receives input pulses from said photomultipler tube including means for analyzing input pulses having pulse widths of significantly less than 50 nanoseconds.
Claim 3
Dependent Claim
19 words
The dosimetry system of claim 1 further comprising means for reducing the pulse repetition rate of said input pulses.
Claim 4
Dependent Claim
44 words
The dosimetry system of claim 2 wherein said means for reducing the pulse repetition rate of said input pulses comprises a programmable divide-by-N circuit capable of receiving a very high pulse repetition rate and bringing the pulse repetition rate down into any desirable range.
Claim 5
Dependent Claim
28 words
The dosimetry system of claim 3 wherein said means for analyzing input pulses having pulse widths of significantly less than 50 nanoseconds is comprised of a one-shot circuit.
Claim 6
Dependent Claim
32 words
The dosimetry system of claim 4 wherein said one-shot circuit is comprised of an emitter coupled logic flip-flop which can accept input pulses having pulse widths of significantly less than 50 nanoseconds.
Claim 7
Dependent Claim
36 words
The dosimetry system of claim 1 wherein said means for analyzing generates an output comprising output pulses and further comprising means for converting the output pulses of said means for analyzing into a measure of radioactivity.
Claim 8
Dependent Claim
70 words
The dosimetry system of claim 6 wherein said means for converting the output pulses into a measure of radioactivity comprises a Multiplier-Divider circuit which accepts said output pulses and multiplies them by a number corresponding to the eluate Flow Rate divided by a constant, K, in order to carry out the formula: ##EQU5## Where, A=total acitvity (in milliCuries); N=net counts (from Single Channel Analyzer); F=Flow Rate; and K=the calibration factor.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |