Registers – Calculators – Bar
Patent
1996-12-06
1998-05-19
Tso, Edward
Registers
Calculators
Bar
G06G 102
Patent
active
057538964
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The state of the acid-base equilibrium (E.A.B.) is information which is of great importance in medicine, inasmuch E.A.B. alterations, if not rapidly and appropriately corrected, can result in being lethal for the patient. At the actual moment in time, in literature and in common use, only complicated alignment charts exist which permit the more experienced doctors to find directions in the diagnostic sense within such a complicated chapter of physiopathology such as E.A.B. As is known, the haemogasanalytical parameters necessary for the definition of the state of E.A.B. are essentially three: pH, partial pressure of carbon dioxide (PaCO.sub.2) and bicarbonate ion (HCO.sub.3).
Known from Patent Abstract of Japan vol. 16 no. 365 (P-1397), & JP-A-41013266 is the use of alignment charts for indicating and determining the state of the acid-base equilibrium. Such alignment charts however are of very difficult use.
Known from FR-A-2384304 is a device permitting the calculation of three haematological constants starting from three measures, comprising three independent sliding scales having three indexes indicating the constants.
Known from U.S. Pat. No. 4,023,276 is a diagnostic scale for interpretation of an electrocardiogram, composed of a fixed diagnostic scale having two sections, one displaying the interrogation items and another the diagnostic names of the electrocardiogram; and comprising a plurality of sliding scales each indicating the affirmation or denial of the interrogation items; by arranging the diagnostic scales according to the affirmation or denial to each interrogation item, diagnostic names can be displayed on the fixed diagnostic scale.
The diagnostic scale described in said U.S. application is quite complicated and difficult to use.
In the attached table:
FIG. 1 shows the front side of the slide-rule and the front face of the three cursors;
FIG. 2 shows the rear face of the three cursors;
FIG. 3 shows the back side of the slide rule.
SUMMARY OF THE INVENTION
With the acid-base equilibrium slide-rule the sate of E.A.B. is made possible from the knowledge of numerical values of the said three parameters obtained by way of a normal haemogasanalytical exam. The E.A.B. slide-rule consists, in fact, of three cursors, on which according to a graded scale the numerical values of the pH, the ion HCO.sub.3 and of the PaCO.sub.2 are indicated. More precisely the E.A.B. slide-rule consists of an outer frame, within which the three cursors slide, which has a frontal face or frontal rule and a rear face or rear-rule. The frontal-rule is made up of a transparent material that covers the front of the outer frame within which the three cursors slide, allowing in such way a perfect vision of the frontal face of the actual cursors.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevation view of the preferred embodiment of the invention;
FIG. 2 is a rear elevation view of parts of the preferred embodiment of the invention shown in FIG. 1;
FIG. 3 is a rear elevation view of another part of the preferred embodiment of the invention shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As is illustrated in FIG. 1 such frontal-rule of a transparent material has, at the height of each cursor and in correspondence with each extremity of the same, a semicircular cut that allows for holding the cursor between two fingers for its movement within the groove towards the right or the left. On the frontal-rule (FIG. 1) the frontal faces of the three cursors, by way of the aforementioned transparent material, are therefore made visible, so that from the from the top towards the bottom they are contained in corresponding grooves according to the order: pH, HCO.sub.3, PaCO.sub.2. The pH scale varies from a numerical value of 7.00 to one of 8.50 according to a centesimal subdivision corresponding to 7.00-7.10-7.20-7.30-7.40-7.50-7.60-7.70-7.80-7.90-8.00-8.10-8.20-8.30-8.40 -8.50. The second cursor is that of the ion HCO.sub.3 : the graded scale varies from 5 to 75 according to a unitary
REFERENCES:
patent: 4023276 (1977-05-01), Furukawa et al.
patent: 4327584 (1982-05-01), Alinari
patent: 4775779 (1988-10-01), Fukute
patent: 4960029 (1990-10-01), Nelson
patent: 4961362 (1990-10-01), Gunn
patent: 5280567 (1994-01-01), Kobayashi
Patent Abstracts of Japan, vol. 16, No. 365 (P-1397), 6 Aug. 1992, Pat. 4,111,266 14 Apr. 1992, Takeshi.
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