US3832067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimeter for detecting blood leaks in an artificial kidney machine
Assignee: KOPF D SYST
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Filing: 1972-11-24
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Granted: 1974-08-27
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Expires: 1992-11-24
Abstract
Abstract A colorimeter is provided that senses the presence of a contaminant opaque to light of a specific color which is carried in a fluid flowstream. As the flowstream passes through the colorimeter, a photocell on one side of the flowstream is illuminated only by light of the specific color which originates on the opposite side of the flowstream, the photocell sensing a change in intensity of transmitted light caused by presence of the contaminant.
Inventors
- 👤 J Kopf
- 👤 C Bacon
- 👤 T Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:36
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/85; A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1692; A61M2205/00; A61M2205/33; A61M2205/3306; A61M2205/3313
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A detector for use in an artificial kidney machine for sensing the presence of blood in the flowstream of dialysate solution comprising: an enclosed flow cell with an inlet stage, a detection stage and an outlet stage through which said dialysate solution flows diverter means in said inlet stage guiding a portion of said dialysate solution at high velocity along a direct path to said detection stage a passageway in said diverter means through which a stabilizing stream of said dialysate solution flows a photocell mounted in said detection stage and a monochromatic source of light of a color to which blood is opaque that illuminates said photocell and said dialysate solution as it flows through said detection stage.
Claim 2
Dependent Claim
119 words
A detector for use in an artificial kidney machine for sensing the presence of blood in the flowstream of dialysate solution comprising: an enclosed flow cell with an inlet stage, a detection stage and an outlet stage through which said dialysate solution flows diverter means in said inlet stage guiding a portion of said dialysate solution at high velocity along a direct path to said detection stage a passageway in said diverter means through which a stabilizing stream of said dialysate solution flows a photocell mounted in said detection stage and a monochromatic source of light of a color to which blood is opaque that illuminates said photocell and said dialysate solution as it flows through said detection stage.
Claim 3
Dependent Claim
25 words
The device of claim 1 in which said outlet stage is above said inlet stage and said passageway in said diverter means is oriented vertically.
Claim 4
Dependent Claim
31 words
The device of claim 2 further comprising drain means that drains dialysate solution remaining in said enclosed flow cell when the flow of dialysate solution through said enclosed flow cell stops.
Claim 5
Dependent Claim
15 words
The device of claim 1 in which said monochromatic source of light produces green light.
Claim 6
Dependent Claim
15 words
The device of claim 1 in which said monochrOmatic source of light produces blue-green light.
Claim 7
Dependent Claim
131 words
A detector for use in an artificial kidney machine for sensing the presence of blood in the flowstream of dialysate solution comprising: an enclosed flow cell with an inlet stage, a detection stage and an outlet stage through which said dialysate solution flows diverter means in said inlet stage guiding a portion of said dialysate solution at high velocity along a direct path to said detection stage a passageway in said diverter means through which a stabilizing stream of said dialysate solution flows a photocell mounted in said detection stage and a light source that illuminates said photocell and said dialysate solution as it flows through said detection stage, and filter means between said light source and said photocell which passes only light of a color to which blood is opaque.
Claim 8
Dependent Claim
131 words
A detector for use in an artificial kidney machine for sensing the presence of blood in the flowstream of dialysate solution comprising: an enclosed flow cell with an inlet stage, a detection stage and an outlet stage through which said dialysate solution flows diverter means in said inlet stage guiding a portion of said dialysate solution at high velocity along a direct path to said detection stage a passageway in said diverter means through which a stabilizing stream of said dialysate solution flows a photocell mounted in said detection stage and a light source that illuminates said photocell and said dialysate solution as it flows through said detection stage, and filter means between said light source and said photocell which passes only light of a color to which blood is opaque.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |