WO1992017227A3 - Drop detection method and apparatus - Google Patents

Drop detection method and apparatus Download PDF

Info

Publication number
WO1992017227A3
WO1992017227A3 PCT/US1992/002435 US9202435W WO9217227A3 WO 1992017227 A3 WO1992017227 A3 WO 1992017227A3 US 9202435 W US9202435 W US 9202435W WO 9217227 A3 WO9217227 A3 WO 9217227A3
Authority
WO
WIPO (PCT)
Prior art keywords
detector
drop
virtually
pass filter
light source
Prior art date
Application number
PCT/US1992/002435
Other languages
French (fr)
Other versions
WO1992017227A2 (en
Inventor
Denis Y Yerlikaya
Randall Jeffrey Krohn
Clarence Logan Walker
Michael John Wilhelm
Curtis Durrell Kinghorn
Original Assignee
Sherwood Medical 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 Sherwood Medical Co filed Critical Sherwood Medical Co
Priority to EP92910567A priority Critical patent/EP0578764B1/en
Priority to CA002102424A priority patent/CA2102424C/en
Priority to AU17677/92A priority patent/AU668089B2/en
Priority to DE69221135T priority patent/DE69221135T2/en
Publication of WO1992017227A2 publication Critical patent/WO1992017227A2/en
Publication of WO1992017227A3 publication Critical patent/WO1992017227A3/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/10—Mirrors with curved faces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16886—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body for measuring fluid flow rate, i.e. flowmeters
    • A61M5/1689—Drip counters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/14—Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00—Surgery
    • Y10S128/13—Infusion monitoring

Abstract

A drop detector system and method are provided for a drop detector of the type including a drop chamber (30) and an electro-optical sensor (40). The detector system detects drops passing through an optical sensing path between a detector (40) and at least one light source (38). In response to the detection of a drop passing through the optical path, the detector produces an output signal. A capacitator is connected between the detector and an amplifier to block the DC component of the output signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber. The detector and light source or sources are arranged to detect drops falling in the drop chamber at virtually any angle and in virtually any ambient light condition.
PCT/US1992/002435 1991-04-01 1992-03-31 Drop detection method and apparatus WO1992017227A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP92910567A EP0578764B1 (en) 1991-04-01 1992-03-31 Drop detection method and apparatus
CA002102424A CA2102424C (en) 1991-04-01 1992-03-31 Drop detection method and apparatus
AU17677/92A AU668089B2 (en) 1991-04-01 1992-03-31 Drop detection method and apparatus
DE69221135T DE69221135T2 (en) 1991-04-01 1992-03-31 DROP DETECTOR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/678,639 US5256155A (en) 1991-04-01 1991-04-01 Drop detection method and apparatus
US678,639 1991-04-01

Publications (2)

Publication Number Publication Date
WO1992017227A2 WO1992017227A2 (en) 1992-10-15
WO1992017227A3 true WO1992017227A3 (en) 1992-11-12

Family

ID=24723654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/002435 WO1992017227A2 (en) 1991-04-01 1992-03-31 Drop detection method and apparatus

Country Status (10)

Country Link
US (2) US5256155A (en)
EP (3) EP0768092B1 (en)
AU (2) AU668089B2 (en)
CA (1) CA2102424C (en)
DE (3) DE69231867T2 (en)
IE (1) IE79030B1 (en)
IL (1) IL101413A (en)
MX (1) MX9201484A (en)
TW (1) TW207955B (en)
WO (1) WO1992017227A2 (en)

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Also Published As

Publication number Publication date
CA2102424A1 (en) 1992-10-02
IE79030B1 (en) 1998-04-08
EP0578764B1 (en) 1997-07-23
IL101413A (en) 1995-05-26
IL101413A0 (en) 1992-11-15
DE69232670D1 (en) 2002-08-08
DE69231867T2 (en) 2002-04-18
EP0768092A3 (en) 1997-12-03
EP0578764A1 (en) 1994-01-19
AU1767792A (en) 1992-11-02
EP0768092A2 (en) 1997-04-16
IE921024A1 (en) 1992-10-07
DE69221135T2 (en) 1997-11-27
EP0768092B1 (en) 2002-07-03
EP0770403A3 (en) 1997-12-03
TW207955B (en) 1993-06-21
EP0770403A2 (en) 1997-05-02
US5346466A (en) 1994-09-13
DE69232670T2 (en) 2003-02-27
AU5618196A (en) 1996-08-29
WO1992017227A2 (en) 1992-10-15
AU668089B2 (en) 1996-04-26
EP0770403B1 (en) 2001-06-06
MX9201484A (en) 1993-02-01
US5256155A (en) 1993-10-26
DE69231867D1 (en) 2001-07-12
DE69221135D1 (en) 1997-09-04
CA2102424C (en) 2003-05-20

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