FR2403603A1 - Electronic counter for blood corpuscles - has statistical checks to reject extreme values and compute reliable mean - Google Patents

Electronic counter for blood corpuscles - has statistical checks to reject extreme values and compute reliable mean

Info

Publication number
FR2403603A1
FR2403603A1 FR7809705A FR7809705A FR2403603A1 FR 2403603 A1 FR2403603 A1 FR 2403603A1 FR 7809705 A FR7809705 A FR 7809705A FR 7809705 A FR7809705 A FR 7809705A FR 2403603 A1 FR2403603 A1 FR 2403603A1
Authority
FR
France
Prior art keywords
rejected
blood corpuscles
calculated
extreme values
electronic counter
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Withdrawn
Application number
FR7809705A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Becton Dickinson and Co
Original Assignee
Becton Dickinson and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Becton Dickinson and Co filed Critical Becton Dickinson and Co
Publication of FR2403603A1 publication Critical patent/FR2403603A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects
    • G01N15/12—Investigating individual particles by measuring electrical or magnetic effects by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle
    • 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
    • G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects
    • G01N15/12—Investigating individual particles by measuring electrical or magnetic effects by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle
    • G01N15/131—Details
    • G01N15/132—Circuits

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

Blood corpuscles are electronically counted as they pass through an orifice (18) from changes in conductivity between electrodes (20, 22) on either side. The output pulses that occur in each of a succession of time intervals is found and the sequence of results is subject to statistical analysis to reject extreme or unreliable data. Firstly, the means valves, standard deviation and scatter coefficient are calculated; the latter is then compared with a calculated coefficient, and if it is smaller, then the results are acceptable and the overall mean count is calculated. If it is larger, those counts lying more than 1.4 standard deviations from the mean are rejected. If too many are so rejected, the entire series is rejected.
FR7809705A 1977-09-15 1978-03-31 Electronic counter for blood corpuscles - has statistical checks to reject extreme values and compute reliable mean Withdrawn FR2403603A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US83355877A 1977-09-15 1977-09-15
US83355777A 1977-09-15 1977-09-15

Publications (1)

Publication Number Publication Date
FR2403603A1 true FR2403603A1 (en) 1979-04-13

Family

ID=27125634

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7809705A Withdrawn FR2403603A1 (en) 1977-09-15 1978-03-31 Electronic counter for blood corpuscles - has statistical checks to reject extreme values and compute reliable mean

Country Status (2)

Country Link
DE (1) DE2812470A1 (en)
FR (1) FR2403603A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254380A2 (en) * 1986-07-25 1988-01-27 Toa Medical Electronics Co., Ltd. Particle size distribution analysis

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61160038A (en) * 1985-01-08 1986-07-19 Sumitomo Electric Ind Ltd Particle detector
US5978435A (en) * 1995-08-21 1999-11-02 Foss Electric A/S Method and an apparatus for determining the number of particles or cells in a liquid sample

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868498A (en) * 1972-03-29 1975-02-25 Contraves Ag Method and apparatus for determining errors during counting of particles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868498A (en) * 1972-03-29 1975-02-25 Contraves Ag Method and apparatus for determining errors during counting of particles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254380A2 (en) * 1986-07-25 1988-01-27 Toa Medical Electronics Co., Ltd. Particle size distribution analysis
EP0254380A3 (en) * 1986-07-25 1989-11-29 Toa Medical Electronics Co., Ltd. Particle size distribution analysis

Also Published As

Publication number Publication date
DE2812470A1 (en) 1979-03-22

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Legal Events

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