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US3706499A Expired / Lapsed US ⏱️ 0.0 years remaining

Blood test system

Assignee: Becton Dickinson and Co
•
Filing: 1970-03-02
•
Granted: 1972-12-19
•
Expires: 1990-03-02
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Abstract

Abstract A blood testing system which includes a colorimeter for observing the light transmission characteristics of a reacted blood sample to determine the concentration of a particular component. The colorimeter includes a lamp, a sample holding well, a photocell, and a meter having a needle to indicate the output of the photocell. A removable module is provided which is adapted to plug into the circuitry of the instrument and adjustably calibrate the instrument for a particular blood determination. The module includes a printed scale which is designed to be positioned immediately adjacent the meter needle when the module is operatively connected to the colorimeter, the units of the scale being correlated to the particular blood determination of the module such that the scale reads directly in the units of the test being conducted. By employing a number of modules, each being color-coded and calibrated for a particular blood determination, the colorimeter may be easily adapted to perform a number of tests by merely inserting the appropriate module. A carousel is provided for mounting several modules in the instrument, the carousel being rotatable to sequentially translate individual modules to the operative position adjacent the output needle of the meter. A number of filters are provided for the colorimeter, and a mechanism is incorporated which is designed to selectively position individual filters in the light path of the colorimeter. A patient record card is provided which is adapted to overlie and be temporarily affixed to the module. The card, which may also be color-coded, includes a scale which overlies the scale of the module, this scale being adapted to be marked to serve as a permanent record of the test determination. A removable tear-off tab is associated with the card which may be utilized to identify a blood sample by patient number and test. A number of marked cards, obtained over a period of time for a particular test, is adapted to be placed in overlapping relationship whereby the test results will be displayed as a graph plotted against time. A folder is provided to retain the cards in such overlapping relationship, the folder having a clear plastic overlay with indicia thereon to indicate the normal range of the test results. The cuvette containing the reagent required for the blood determination is provided with a molded plastic cap which is designed to retain a capillary within the cuvette when the cap is attached. For this purpose, the cap includes an integral depending flap having an aperture therethrough, the aperture being designed to threadedly receive the capillary.

Inventors

  • 👤 Edward J Rapoza
  • 👤 Maxwell E Siegel
  • 👤 Weems E Estelle
  • 👤 Pasquale M Petrucci
  • 👤 Joseph S Linarducci
  • 👤 John Hamma
  • 👤 John Montgomery

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 23:49
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/251; G01N21/253; B; B01; B01L; B01L3/00; B01L3/54; B01L3/545; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/492

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 212 words
A colorimeter comprising: a supporting structure containing a lamp, a photocell, a sample holding well positioned between said lamp and said photocell, an ammeter for displaying the output of said photocell, an amplifier, and including means to regulate the voltage from the power supply prior to current being provided to the lamp so that essentially a constant amount of current is provided, a removable module having electrical means connectable in said circuit to vary the output gain of said amplifier, whereby said meter may be calibrated for a particular colorimetric determination when said module electrical means is operatively connected in said circuit, said circuit including a feed-back loop in said amplifier, and said module electrical means including a manually adjustable variable resistance element for connection into said feed-back loop for adjusting and setting the output gain of the amplifier in order to calibrate the colorimeter so that, when said module is removed and replaced by a further module, only the variable resistance element in the further module need be adjusted and set to calibrate the output gain of the amplifier in order to calibrate the colorimeter so that said calibration remains the same for a reasonable length of time upon removal thereof from the remainder of the colorimeter and later returned thereto.
Claim 2
Dependent Claim 212 words
A colorimeter comprising: a supporting structure containing a lamp, a photocell, a sample holding well positioned between said lamp and said photocell, an ammeter for displaying the output of said photocell, an amplifier, and including means to regulate the voltage from the power supply prior to current being provided to the lamp so that essentially a constant amount of current is provided, a removable module having electrical means connectable in said circuit to vary the output gain of said amplifier, whereby said meter may be calibrated for a particular colorimetric determination when said module electrical means is operatively connected in said circuit, said circuit including a feed-back loop in said amplifier, and said module electrical means including a manually adjustable variable resistance element for connection into said feed-back loop for adjusting and setting the output gain of the amplifier in order to calibrate the colorimeter so that, when said module is removed and replaced by a further module, only the variable resistance element in the further module need be adjusted and set to calibrate the output gain of the amplifier in order to calibrate the colorimeter so that said calibration remains the same for a reasonable length of time upon removal thereof from the remainder of the colorimeter and later returned thereto.
Claim 3
Dependent Claim 29 words
The invention in accordance with claim 1 wherein said removable module further includes electrical means connectable in said circuit to adjustably regulate the flow of current to said lamp.
Claim 4
Dependent Claim 60 words
The invention in accordance with claim 2 wherein said ammeter includes a needle indicating the flow of current therethrough, and said module including a printed scale for positioning adjacent said needle when said module electrical means is operatively connected in said circuit, said scale being correlated with said ammeter to read directly in the units of said particular colorimetric determination.
Claim 5
Dependent Claim 38 words
The invention in accordance with claim 3 wherein a plurality of filters are positioned on one end of a lever arm, said lever arm being rotatable to selectively position an individual filter between said lamp and said photocell.
Claim 6
Dependent Claim 57 words
The invention in accordance with claim 4 wherein said module further includes a cam for engaging the opposite end of said lever arm when said module electrical means is operativelY connected in said electrical circuit, the position of said cam on said module being predetermined whereby a preselected filter is positioned between said lamp and said photocell.
Claim 7
Dependent Claim 46 words
The invention in accordance with claim 1 wherein a rotatable carousel is positioned on the supporting structure and having a plurality of radially disposed module receiving stations thereon, said carousel being rotatable whereby each module receiving station may be selectively rotated into a meter read-out position.
Claim 8
Dependent Claim 33 words
The invention in accordance with claim 6 wherein terminal means are provided to operatively connect said module electrical means in said electrical circuit when said module is positioned in said meter read-out position.

References Cited (Backward Citations)

US2048554A Cited
US2891438A Cited
US2657357A Cited
US2836793A Cited
US2982174A Cited
US3441352A Cited
US3561878A Cited
US3619776A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-12-19 1976-06-19 1976-12-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-12-19 1980-06-19 1980-12-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-12-19 1984-06-19 1984-12-19 $7700.00 Window Closed / Lapsed

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