US5605837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control solution for a blood glucose monitor
Assignee: LifeScan Inc
•
Filing: 1996-02-14
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Granted: 1997-02-25
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Expires: 2016-02-14
Abstract
Abstract A control solution for use with a photometric blood glucose strip contains glucose in an aqueous suspension of carbon black. The control solution mimics blood when applied to a whole blood glucose test strip, which is then inserted into a meter. A meter reading within a predetermined range indicates that meter and strip are operating satisfactorily. Preferably the control solution is buffered to a neutral pH and includes chloride ion to provide a stable end point for the glucose reaction. Depending on the glucose concentration, the solution checks meter and strip operation at high, low, and normal blood glucose levels.
Inventors
- 👤 Saker A. Karimi
- 👤 Geoffrey McGarraugh
- 👤 Yeung S. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:39
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/96; G01N33/66; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/104998; Y10T436/106664
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
The control solution that mimics whole blood for use with a photometric blood glucose strip, which comprises a suspension of opaque iron oxide or carbon water, a dispersant to keep the particles in suspension, and a predetermined concentration of glucose.
Claim 2
Dependent Claim
40 words
The control solution that mimics whole blood for use with a photometric blood glucose strip, which comprises a suspension of opaque iron oxide or carbon water, a dispersant to keep the particles in suspension, and a predetermined concentration of glucose.
Claim 3
Dependent Claim
14 words
The control solution of claim 1 in which the opaque particles comprise carbon particles.
Claim 4
Dependent Claim
18 words
The control solution of claim 2 in which the concentration of particles is at least about 0.015% w/v.
Claim 5
Dependent Claim
20 words
The control solution of claim 2 in which the particles are substantially spherical, with a diameter of about 40 nm.
Claim 6
Dependent Claim
34 words
The control solution of claim 1 further comprising an end point stablizer, which stablizes absorbance of 660 nm radiation by the control solution a predetermined time after contact with a photometric blood glucose strip.
Claim 7
Dependent Claim
15 words
The control solution of claim 5 in which the end point stabilizer is chloride ion.
Claim 8
Dependent Claim
23 words
The control solution of claim 6 in which the chloride ion concentration is in a range from about 0.1% to about 0.25% w/v.
Claim 9
Dependent Claim
16 words
The control solution of claim 7 in which the chloride ion concentration is about 0.20% w/v.
Claim 10
Dependent Claim
10 words
The control solution of claim 1 further comprising a buffer.
Claim 11
Dependent Claim
12 words
The control solution of claim 9 in which the buffer comprises EDTA.
Claim 12
Dependent Claim
25 words
The control solution of claim 9 in which the buffer maintains the solution at a pH in a range from about 6.5 to about 7.5.
Claim 13
Dependent Claim
10 words
The control solution of claim 1 further comprising an antifreeze.
Claim 14
Dependent Claim
12 words
The control solution of claim 12 in which the antifreeze comprises glycerol.
Claim 15
Dependent Claim
10 words
The control solution of claim 1 further comprising a preservative.
Claim 16
Dependent Claim
13 words
The control solution of claim 14 in which the preservative is imidazolidinyl urea.
Claim 17
Dependent Claim
18 words
The control solution of claim 15 in which the imidazolidinyl urea concentration is at least about 0.07% w/v.
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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) | 2000-02-25 | 2000-08-26 | 2001-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-25 | 2004-08-26 | 2005-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-25 | 2008-08-26 | 2009-02-25 | $7700.00 | Window Closed / Lapsed |