EP0998669A1 - In-vitro detection of reactions in blood to foreign substances - Google Patents
In-vitro detection of reactions in blood to foreign substancesInfo
- Publication number
- EP0998669A1 EP0998669A1 EP97917620A EP97917620A EP0998669A1 EP 0998669 A1 EP0998669 A1 EP 0998669A1 EP 97917620 A EP97917620 A EP 97917620A EP 97917620 A EP97917620 A EP 97917620A EP 0998669 A1 EP0998669 A1 EP 0998669A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blood
- potential
- measured
- volume
- solids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/48707—Physical analysis of biological material of liquid biological material by electrical means
- G01N33/48714—Physical analysis of biological material of liquid biological material by electrical means for determining substances foreign to the organism, e.g. drugs or heavy metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/12—Coulter-counters
Definitions
- the present invention is directed to the field of medical diagnoses, and, more specifically, diagnoses performed by detecting reactions in blood caused by the presence of foreign substances therein. I refer to this test as the "MRT" Test.
- the MRT Test relates to the field of hypersensitivity reactions observed in humans and animals. These reactions can be due to contact with offending substances such as medications, environmental chemicals, foods, carcinogens, food additives, etc.
- the MRT Test is an in- vitro assay which indirectly detects the release of mediators in whole blood after it is mixed with a test substance.
- a patient's blood reacts with the test substance, intracellular fluids are released, causing the liquid portion of blood to increase, while the total volume of the solids present in the blood decreases.
- These reactions may be caused by various immunologic and non-immunologic mechanisms.
- Blood is a liquid that circulates throughout the body using the vascular system and is in contact with practically every cell in the body. Blood delivers oxygen, food and other essential elements to all of our cells. Approximately 50% of blood is a fluid called serum (or plasma). It is a complex mixture of water, various proteins, carbohydrates, lipids, and electrolytes. Small amounts of other substances such as vitamins, minerals, and hormones are also found in blood. The other 50% of blood is comprised of solids such as erythrocytes (red blood cells: RBC), leukocytes (white blood cells: WBC), and thrombocytes (Platelets).
- RBC red blood cells
- WBC white blood cells
- thrombocytes Platinum
- the white blood cells are a significant part of our body's immune system.
- the immune system is highly complex and intricate in its design and is responsible for defending against foreign invaders such as bacteria, viruses, and other pathogens.
- the science of immunology incorporates the study of resistance to infections and the rejections of so called "foreign substances”.
- Types I-IV immune mediated hypersensitivity reactions and categorized them as Types I-IV, based upon the mechanics ofthe reaction. ' Types I. II, and III are identified as antibody mediated and the fourth one is described as cell mediated.
- Type I is the most widely occurring hypersensitivity reaction. It involves Mast cells and basophils, which bind IgE through their Fc receptors. After encountering the antigen, the antibody induces degranulation (the destruction ofthe exterior wall of the cell) and release of mediators.
- Type II reactions involve the binding of antigen and anv body on the surface of a cell, generally resulting in the destruction of the cell. As is the case in a Type I reaction, the final outcome of this reaction generates the release of cellular contents (including the release of the mediators).
- Type III reactions address the interactions of cells with complexes. Immune complexes, when deposited on tissue, cause complement activation, which in turn attracts polymo ⁇ honuclear leukocytes ("polymo ⁇ hs"). As their normal response, the polymo ⁇ hs will attempt phagocytosis on the complexes, but in many instances the complexes will be trapped by the tissue, blocking phagocytosis. As a natural course, polymo ⁇ hs will release inflammatory mediators.
- Type IV reactions involve sensitized T-lymphocytes. After the second contact with a specific antigen. T cells release lymphokines. which produces an inflammatory response, and in turn attracts mediator-releasing macrophages.
- reactions caused by immune, toxic, pharmacological and other mechanisms may cause d e release of mediators into the blood stream.
- a method of detecting reaction in blood caused by the presence of a foreign substance in the blood comprising the steps of: establishing a potential across a predetermined spatial volume; passing a first portion of the blood through the predetermined spatial volume; substantially continuously measuring the potential across the predetermined spatial volume over a first predetermined period of time; comparing the measured potential with a baseline; and calculating the total volume of solids in the first portion of the blood as a function of a total absolute deviation ofthe measured potential from the baseline.
- the same procedure is then followed with a second portion ofthe blood, after it has been exposed to the substance whose reaction is being determined.
- the two calculations are then compared, with a positive reaction being indicated when the two measured solid volumes are measurably different.
- an in-vitro method for detecting a reaction in blood caused by substances comprising the steps of: establishing a first potential across a first predetermined spatial volume: passing a first portion of the blood through the first predetermined spatial volume; substantially continuously measuring the first potential over a first predetermined period of time; comparing the measured first potential with a first baseline: calculating the total volume of solids in the first portion o the blood as a first function of a total absolute deviation of the measured first potential from said first baseline; exposing a second portion of the blood to a substance; establishing a second potential across a second predetermined spatial volume; passing the second portion of the blood through the second predetermined spatial volume; substantially continuously measuring the second potential over a second predetermined period of time; comparing the measured second potential with a second baseline; calculating the total volume of solids in the second portion of the blood as
- an in-vitro method for detecting a reaction in blood caused by substances comprising the steps of: establishing a first potential across a first predetermined spatial volume; passing a first portion ofthe blood through the first predetermined spatial volume; substantially continuously measuring the first potential over a first predetermined period of time; comparing the measured first potential with a first dynamic baseline; calculating the total volume of solids in the first portion of the blood as a first function of a total absolute deviation ofthe measured first potential from the first dynamic baseline; exposing a second portion of the blood to a substance; establishing a second potential across a second predetermined spatial volume; passing the second portion of the blood through the second predetermined spatial volume; substantially continuously measuring the second potential over a second predetermined period of time; comparing the measured second potential wid a second dynamic baseline; calculating the total volume of solids in the second portion of the blood as a second function of a total absolute deviation of the measured second potential from the second dynamic baseline; and comparing the total volume of solids in the
- Figure 1 illustrates an idealized particle (balloon) having a volume of 300 ⁇ l, in a unit volume of 1 ml of a suspension, leaving a liquid volume of 700 ⁇ l.
- Figure 2 illustrates an identical unit volume of 1 ml (not drawn to scale), in which the particle has a volume of only 100 ⁇ l, and the liquid a resultant volume of 900 ⁇ l.
- Figure 3 illustrates an actual oscilloscope reading of a series of particles being measured as they pass through the electromagnetic field under observation.
- Figure 4 shows a close up of some oscilloscope readings such as depicted in Fig. 3.
- Figure 5 shows a smoothed curve showing three particles passing through the electromagnetic field being measured.
- Figure 6 shows an idealized representation of a series of particles passing through the electromagnetic field.
- Figure 7 shows an idealized representation of a comparison of test and control sample readings as the particles pass through the electromagnetic field.
- the MRT Test relies in large part upon the performance of the test described in my co ⁇ pending PCT application, and reference is made thereto for a more complete understanding of the mechanics ofthe testing being done. The following is presented for convenience of reference.
- supplies and Instrumentation may vary to some extent and depend on the type of testing instrument employed for the MRT Test. In this case I have chosen the semi-automated STSIOO manufactured by Signet Diagnostic Co ⁇ oration. and the following description is made with that device as a reference).
- adjustable multi pipette 10-20 ml dispenser e.g. an Oxford pipetor to dispense the electrolytic solution mixed with a lysing agent body temperature incubator, e.g. by Precision Scientific 60-100 ⁇ m rotator, e.g. by Roto Mix 70 ml blood dilution vial with diluent lysing reagent (as described in my prior patents) 8 ml vial testing cuvettes with reagents.
- the reagents are dried and diluted food extracts, e.g. by ALK or Bayer.
- isotonic (electrolytic) solution e.g. Osmocel Isotonic Solution by Hematronic Apparatus, STSIOO or STS200 made by Signet Diagnostic Co ⁇ .
- Control samples contain no reagent.
- Test samples contain a small amount of a substance being evaluated, the "reagent”.
- the control sample serves as a finge ⁇ rint ofthe patient's blood.
- the test sample provides information related to the reaction ofthe tested substance to the reagent being tested. IV. After transferring blood to all tested samples, mix all cuvettes and cap them.
- VIL Remove from incubator and follow by 30 minutes room temperature incubation. Total of 60 minutes incubation. 3. Testing:
- the MRT Test the new proprietary laboratory method, can be described in the following fashion:
- step "c" Measure total volume of liquid and or solids in native blood sample by means ofthe method described in my prior PCT application.
- step "d" Measure total volume of liquid and/or solids in the mixture of blood and tested substance sample. If in step "c", you measure liquids, then do so here. Likewise with solids, so that comparisons may be made "like-to-like”.
- step "d" for each tested substance. This may be done in parallel, i.e. several test measurements taken at the same time, or one after another.
- f Identify volumetric differences of liquid volume and or solid volume between native blood sample and the tested blood sample. g. Prepare the results identifying the measured volumetric differences. h. Identify the positive and negative reactions, by noting which reagents produced a measurable reaction, i.e. one greater than the standard deviation expected for the test, calculated in known fashion.
- Figure 1 represents a small cuvette containing 1 ml of heterogeneous fluid.
- the liquid portion is equivalent to 700 ⁇ l.
- the balloon filled with black ink has an equivalent volume of 300 ⁇ l. Note that for pu ⁇ oses of measurement the balloon would be considered as a solid entity.
- This example illustrates how human blood cells react in the body.
- the reacting substance When the reacting substance is introduced to the blood, it triggers a series of complex reactions.
- the intracellular fluids will be released into the plasma, changing the original ratio of solids to liquid.
- the ratio is the key for identifying the malady (the intracellular liquids contain the mediators causing the clinical symptomology), but the ratio can be determined easily from a measurement of either the solid or the liquid volume per unit volume ofthe blood suspension.
- the basic apparatus is shown in my prior PCT patent application, and includes an aperture tube in which the blood suspension is drawn into an orifice and along an aperture.
- An electromagnetic field is imposed upon the aperture, and the blood suspension is drawn through the field. Since the liquid of the suspension is essentially homogeneous, and conductive, while the blood cells are resistive, with their resistivity varying with their size, the size of the blood cells passing through the aperture may be calculated by measuring the perturbation of the field as the particles pass therethrough.
- the new method does not adhere to the standard peak detection. It continuously measures the flow of volume of liquid and solids in the tested liquid.
- the series of spikes represent particles causing small disturbances in the electrical field.
- the longer and higher the pulse the greater the volume ofthe particle (See printout identified as Figure 4). Accordingly, a smaller particle will create a shorter disturbance of a smaller magnitude, and a larger particle will cause a longer disturbance of a greater magnitude.
- Figure 5 explains how the MRT measurement works and how it differs from the Coulter Method.
- a disturbance caused by particle "PI” produces the spike with the peak high's marked “h,”. It is measured from the base level up to the peak of the signal. After the particle travels the length ofthe aperture, the measured signal experiences a "bounce” in which the measured signal goes below the original baseline, and gradually goes on an upward gradient towards the original baseline. But a subsequent particle may often enter the aperture before the "bounce” is over.
- second particle “P2” starts its disturbance below the static base level. The height of h 2 is measured from the baseline and clearly shows, that the result is not very accurate since the true disturbance commences below that level.
- the third particle (P3) is a platelet and its electrical disturbance is entirely below the base level, due to the large "bounce” caused by P2, and so is invisible to the instrument.
- the lower size limit of particles which may be measured is determined by the static noise threshold established during calibration.
- the upper size limit is related to the physical size of the aperture.
- a major problem associated with electric resistance particle counting and sizing becomes evident when attempts are made to evaluate two dissimilar particle sizes at the same time using the same aperture, e.g. simultaneous measurement of erythrocytes and platelets. After cells pass through the orifice, some re-enter the electrical field with the pulse resembling the size of platelets. Threshold and electrical "noises” are also a substantial problem.
- a specific constant threshold is set during the calibration which controls the minimum level of signal detection. This in turn lowers the presence ofthe electronic "noise". When the voltage change exceeds the level ofthe threshold, the instrument will identify the peak of that impulse. This is the basis ofthe peak detection method.
- the time is measured as the duration of the interval commencing when the gradient ofthe curve begins to indicate the presence ofa particle until the measured signal returns to its original level.
- the presence of the particle is indicated when the gradient increases for a predetermined period, preferably corresponding to at least three consecutive measurement clock cycles.
- V L2 time identified as "V L2 ". This is the time it takes fluid to pass through the orifice.
- V S2 the point “V S2”
- another particle "P2” enters the orifice.
- the signal is still below the static threshold and the static baseline, but the STSIOO instrument recognizes the condition and begins to measure the solid particle.
- H The height ofthe perturbation of the signal is therefore measured as H , from the dynamic baseline, rather than from the static baseline as shown by h 2 . This more accurately reflects the true size ofthe perturbation ofthe signal, and therefore the size ofthe particle.
- the duration ofthe signal identified as "V L2 " is another important part ofthe measurement. If we look at signal "P3". it is evident, that the whole impulse is contained below the baseline. The volume ofthe solid, identified by time “V 3 " arid measured from the dynamic baseline becomes part ofthe measurement.
- the MRT Ribbon Method thus correctly measures all particles suspended in the electrolytic solution. There is a definite relationship between the length, height and volume of the tested particle. Since the STS200 apparatus measures with a frequency greater then 1 MHZ, it is easy to identify the relationship between the size ofthe particle and the time it will need to pass through the orifice. Also the flow of fluid is identified.
- the gradient of the curve on the upward slope of the curve when a particle is present also varies with the size of the particle, larger particles having a steeper slope.
- the exact relationship depends upon the configuration of the system, and may be determined with some minor experimentation depending upon the parameters ofthe equipment being used. Thus, the gradient may also be used to calculate the size of the particles.
- Figure 6 graphically represents how the STS200 identifies the volume of solid and the volume of liquid.
- V L Volume in time in which an instrument measures the liquid
- V s Volume in time in which an instrument measure the solid particle.
- V ⁇ V LT + V s ⁇
- the fluid flows through the orifice.
- the liquid portion is characterized by the flat impulse line and the solid portion is characterized as the visual disturbance in the flat impulse signal.
- the computer software program quantifies the cumulative volume of liquid and cumulative volume of solids in accordance with the rules established, here. There are at least three different ways of data collection and results presentation:
- the next step repeats the preparation process ofthe sample cuvette.
- Results will be calculated from the information obtained from all samples, by comparing the total volume of liquid of control sample to the total volume of liquid ofthe substance sample. We will obtain two results from each substance. One sample will give us information on the activities ofthe Red Blood Cells (RBC) and another sample will inform us . pn reactions of all other then RBC blood components in presence of tested substance. It is not mandatory to conduct the MRT Test in this exact fashion. Per individual need, one can conduct the partial test obtaining results from the first or the second solution only. 4.
- the computer will establish the volumetric baseline of the plasma (liquid) present in one cubic millimeter of control blood sample. Once the baseline is established, the actual volume of plasma present in each milliliter of each blood sample will be calculated and compared against the actual volume of plasma in the control sample. If liquid volume in the control sample significantly varies from liquid volume in the test sample, the tested substance is identified as reacted. A significant reaction would be one greater than could be attributed to the known instrumentation error plus the standard deviation for similar measurements. Any difference of less than that amount would not necessarily indicate a positive reaction, since it could be attributed to statistical or instrumentation error.
- Figure 7 portrays the measurement ofthe blood sample distribution ofthe Control and Test Samples. The differences between the distribution patterns would be due to the exposure ofthe Test Sample to the tested substance.
- the computer program will calculate the variation and save it as the results data. Inte ⁇ retation of results will be based on the standard deviations and other generally accepted laboratory methods of results inte ⁇ retation.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1406096P | 1996-03-25 | 1996-03-25 | |
US14060P | 1996-03-25 | ||
PCT/US1997/004849 WO1997036169A1 (en) | 1996-03-25 | 1997-03-25 | In-vitro detection of reactions in blood to foreign substances |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0998669A1 true EP0998669A1 (en) | 2000-05-10 |
EP0998669A4 EP0998669A4 (en) | 2004-11-17 |
Family
ID=21763317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97917620A Withdrawn EP0998669A4 (en) | 1996-03-25 | 1997-03-25 | In-vitro detection of reactions in blood to foreign substances |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0998669A4 (en) |
AU (1) | AU2589597A (en) |
WO (1) | WO1997036169A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3733548A (en) * | 1971-04-28 | 1973-05-15 | Coulter Electronics | Apparatus and method for measuring particle concentration of a suspension passing through a sensing zone |
WO1992001934A1 (en) * | 1990-07-17 | 1992-02-06 | Pasula Mark J | Blood testing apparatus |
US5376878A (en) * | 1991-12-12 | 1994-12-27 | Fisher; Timothy C. | Multiple-aperture particle counting sizing and deformability-measuring apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4021117A (en) * | 1975-08-07 | 1977-05-03 | Hildegard Gohde | Process for automatic counting and measurement of particles |
US4788155A (en) * | 1983-11-01 | 1988-11-29 | Pasula Mark J | Method and apparatus for measuring the degree of reaction between a foreign entity and a subject's blood cells |
-
1997
- 1997-03-25 AU AU25895/97A patent/AU2589597A/en not_active Abandoned
- 1997-03-25 WO PCT/US1997/004849 patent/WO1997036169A1/en not_active Application Discontinuation
- 1997-03-25 EP EP97917620A patent/EP0998669A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3733548A (en) * | 1971-04-28 | 1973-05-15 | Coulter Electronics | Apparatus and method for measuring particle concentration of a suspension passing through a sensing zone |
WO1992001934A1 (en) * | 1990-07-17 | 1992-02-06 | Pasula Mark J | Blood testing apparatus |
US5376878A (en) * | 1991-12-12 | 1994-12-27 | Fisher; Timothy C. | Multiple-aperture particle counting sizing and deformability-measuring apparatus |
Non-Patent Citations (1)
Title |
---|
See also references of WO9736169A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0998669A4 (en) | 2004-11-17 |
WO1997036169A1 (en) | 1997-10-02 |
AU2589597A (en) | 1997-10-17 |
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