US3596515A - Drop flow sensor and resilient clamp therefor - Google Patents

Drop flow sensor and resilient clamp therefor Download PDF

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Publication number
US3596515A
US3596515A US685928A US3596515DA US3596515A US 3596515 A US3596515 A US 3596515A US 685928 A US685928 A US 685928A US 3596515D A US3596515D A US 3596515DA US 3596515 A US3596515 A US 3596515A
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US
United States
Prior art keywords
housing
light source
sensing
sleeve
drip chamber
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.)
Expired - Lifetime
Application number
US685928A
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English (en)
Inventor
Richard A Cramer
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.)
NEW IVAC Inc
Original Assignee
Ivac Medical Systems Inc
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 Ivac Medical Systems Inc filed Critical Ivac Medical Systems Inc
Application granted granted Critical
Publication of US3596515A publication Critical patent/US3596515A/en
Assigned to NEW IVAC, INC. reassignment NEW IVAC, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: IVAC CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/08—Design features of general application for actuating the drive
    • G06M1/10—Design features of general application for actuating the drive by electric or magnetic means
    • G06M1/101—Design features of general application for actuating the drive by electric or magnetic means by electro-optical means
    • 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
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/008—Indicating or recording presence, absence, or direction, of movement by using a window mounted in the fluid carrying tube
    • G01P13/0086—Indicating or recording presence, absence, or direction, of movement by using a window mounted in the fluid carrying tube with photo-electric detection

Definitions

  • the housing can be selectively clamped upon the drip chamber with the drip chamber positioned within the sensing gap to intercept the reference beam.
  • a falling drop of fluid within the drip chamber interrupts the reference beam, and the variation in the electrical response of the photocell is communicated to an indicator to indicate the presence of a drop.
  • a spring-biased sleeve clamps the housing onto any size drip chamber without altering the size of the sensing gap.
  • the clamping sleeve is provided with rods which extend radially outward from opposite sides of the sleeve and, in conjunction with one end of the housing, define a syringetype grip for positioning the sleeve.
  • the present invention relates generally to drop flow sensing devices and, more particularly, to a new and improved device for sensing the presence of a drop of fluid in the drip chamber of an intravenous set or the like used in medical applications.
  • the intravenous set comprises a bottle of fluid, normally supported in an inverted position, and a valve mechanism which allows the fluid to drip out of the bottle at a controlled rate into a drip chamber below the bottle.
  • the drip chamber serves the dual function of allowing a nurse or other attendant to observe the rate at which the fluid drips out of the bottle and also creates a reservoir for the fluid at the lower end of the chamber to insure that no air enters the main feeding tube leading to the patient.
  • the present invention is directed to improvements in sensing devices for detecting the presence of a falling drop at a specified location in a drop flow system, such as an intravenous set or the like.
  • a relatively narrow reference beam of light enters one side of a drip chamber or the like and strikes a photocell located on the opposite side of the chamber A drop of fluid falling through the drip chamber interrupts the reference beam, and the resultant change in the electrical response of the photocell indicates the presence of the drop.
  • the light source and photocell may be mounted in two respective, axially aligned sections of a substantially tubular housing. A sensing gap between the two sections is externally bridges by a fixed member. The light source and photocell are thus maintained at a constant distance from each other. Clamping means are provided for mounting the sensing device without altering the distance between the light source and photocell, thus resulting in a uniform response characteristic for different sizes of the drip chamber.
  • the clamping means may comprise a concentric sleeve surrounding one of the housing sections and spring-biased to move across the sensing gap so that the sensing device can be mounted on a drip chamber with the chamber clamped between one of the housing sections and the sleeve.
  • the spatial relationship between the light source, drip chamber and photocell is such that the light source is closest to the drip chamber, so that a falling drop interrupts a relatively large part ofthe reference light beam.
  • the clamping sleeve may be provided with rodlike extensions on opposite sides of the sleeve so that the overall structure resembles the conventional syringe familiar to most hospital personnel. Such personnel can thus grip the sensing device naturally for attachment to or detachment from a drip chamber.
  • the present invention therefore provides a sensing device which is structurally compact, provides uniform response for any size drip chamber, can be quickly and easily installed or removed, and is naturally handled with confidence and ease by hospital personnel.
  • FIG. I is a perspective view of a presently preferred embodiment of a sensing device, in accordance with the present invention, the sensing device being shown installed on a conventional intravenous set and electrically connected to an appropriate electronic indicator;
  • FIG. 2 is an enlarged, end elevational view taken in the direction of the arrow 2 in FIG. I;
  • FIG. 3 is an enlarged sectional view, taken along the line 3-3 in FIG. ll;
  • FIG. 4i is a sectional view, taken along the line l-4 in FIG. 3;
  • FIG. 5 is a combined block diagram and electrical schematic of a complete drop flow monitoring system utilizing the sensing device of the present invention.
  • FIG. 1 a presently preferred embodiment of a sensor 10, constructed according to the present invention, is shown clamped onto a drip chamber 12 of an intravenous set M.
  • a bottle l5 of the intravenous set M is suspended from a hook 16 extended from a vertical pole 18.
  • An electronic indicator 20 is shown in FIG. I mounted upon the pole Ill, and an electric cable 22 connects the indicator to the sensor 10.
  • the senor 110 generally comprises a tubular housing 24 constructed with a centrally located sensing gap 26 between a combined lamphouse and clamping section 23 and a coaxial transducer section 30.
  • the two sections 28, 30 are supported in fixed spatial relationship by an external bridge member 32.
  • the sensor 10 is adapted to be detachably secured to the drip chamber 12 by frictional engagement between the clamping section 2% and a springbiased concentric sleeve 34 slidably mounted on the transducer section 30.
  • the internal end of the clamping section 28 is provided with a substantially V-shaped notch 31 defining a clamping jaw for firmly engaging the chamber 12.
  • a reference beam of light from a light source 36 in the section 28 projects through the drip chamber 112 onto a photocell 38 in the transducer section 30 of the housing 24.
  • the reference light beam is interrupted whenever a fluid drop 40 falls through the drip chamber 112, and this interruption is electrically communicated to the indicator 20) via the cable 22.
  • a pair of finger grip rods 42 extend radially outward from opposite sides of the sleeve 34 and, in conjunction with the outer sealed end Ml of the transducer section 30 of the housing 2%, forms a syringe-type grip for selectively retracting the sleeve to enable mounting or removal of the sensor 110 with respect to the drip chamber 12.
  • the housing 24 of the sensor I0 is preferably formed of molded plastic or the like An integrally formed end wall as seals the external end of the clamping. section 28.
  • the bridge member 32 of the housing 2% is hollow to accommodate a pair of electrical conductors 50 for connection to the photocell 38.
  • the the cavity source 36 is in a central cavity 56 provided in a mounting block 58 positioned just behind the notch 31 in the clamping section 28.
  • a relatively small columnating aperture 60 extends from the cavity 56 through the block 58 and defines a relatively narrow reference light beam.
  • the spatial relationship between the aperture 60, the mounting block 58 and the notch 31 is such that the reference light beam passes approximately through the center of the drip chamber 12 when it is positioned in the notch.
  • the photocell 38 preferably of the germanium-type, is mounted in a close-fitting cavity 62 provided in a mounting block 64 which is positioned at the internal end of the transducer section 30 of the housing 24.
  • a columnating aperture 66 extends from the cavity 62 to the outermost face of the mounting block 64.
  • the light sourcev 36, columnating apertures 60, 66, and the photocell 38 are coaxially aligned to define an optical axis for the sensing system, and to minimize off axis photocell response to stray light.
  • the sleeve 34 When the sensor is mounted on the drip chamber 12, the sleeve 34 is urged toward the drip chamber 12 by means of a compressed coil spring 68 in the transducer section 30 of the housing 24.
  • the sleeve 34 is concentric with and slidable along the transducer section 30 of the housing 24, with clearance for the bridge member 32 being provided by means of a slot 67 in the sleeve.
  • One end of the spring 68 abuts a pin 70 which passes through the section 30 and sleeve 34 and is affixed to the sleeve.
  • the pin 70 travels in a pair of aligned slots 72 in opposite sides of the transducer section 30 (see FIGS. 3 and 4).
  • the finger grip rods 42 are mounted on the outer ends of the pin 70 projecting beyond the external surface of the sleeve 34.
  • the end of the spring 68 opposite that in abutment with the pin 70 abuts an end cap 74 which snaps over the open end 48 of the transducer section 30.
  • the capped end 44 of the transducer section 30 of housing 24 and the finger grip rods 42 form a syringe-type grip familiar to most hospital personn l.
  • the sensor 10 is mounted upon the drip chamber 12 by retracting the spring-biased sleeve 34, positioning the drip chamber in the sensing gap 26, and then releasing the sleeve 34 to engage the chamber.
  • the light source 36 and photocell 38 are electrically connected to the indicator by means of cable 22 which enters the clamping section 28 of the housing 24.
  • One conductor 76 is connected to one terminal of the light source 36 and a second conductor 78 is connected to the other terminal of the light source.
  • the second conductor 78 is common to both the light source circuit and the photocell circuit and is also connected by means of one of the conductors 50 to one terminal of the photocell 38.
  • the third conductor 80 in the cable is connected to the other conductor of the conductor pair 50 and is thereby electrically connected to the second terminal of the photocell 38.
  • the sensing device of the present invention satisfies a longexisting need in the art for a compact, reliable, versatile, and easily utilized drop flow sensor.
  • a generally oblong housing having a sensing gap therein
  • said gap being adapted to receive said drip chamber
  • a light source positioned in a first end of said housing
  • photosensitive means positioned in a second end of said housing said photosensitive means being in the path of said reference beam;
  • clamping means for detachably clamping said device to said drip chamber, said clamping means comprising a sleeve disposed around one of said first and second ends of said housing in sliding relationship therewith, said sleeve being resiliently urged across said gap, and at least one grip rod extending from said sleeve, said grip rod forming a syringe-type grip in conjunction with an external face of said one of said first and second ends of said housing;
  • sensing apparatus for sensing drop flow in a fluid conduit, comprising:
  • housing means for supporting said light source and said photosensitive means in fixed spatial relationship relative to each other, whereby said light source and said photosensitive means are spaced apart by a predetermined distance defining a sensing gap;
  • clamping means resiliently urges clamping means adjacent said sensing gap for retaining a fluid conduit within said gap in the path of said reference beam, said clamping means including a spring biased sleeve surrounding at least a part of said housing means, and at least one grip rod extending from said sleeve to define a syringe like grip with one end of said housing means, said clamping means enabling retention of different size conduits within said sensing gap without altering the size of said gap.
  • Sensing apparatus as set forth in claim 3, and further including means cooperatively associated with said light source and said clamping means for positioning a conduit closer to said light source than to said photosensitive means.
  • said housing means including:
  • Sensing apparatus as set forth in claim 5, wherein said spring biased sleeve surrounds and is concentric with at least one of said substantially tubular housings.
  • said means for defining said reference beam includes means for defining at least one columnating aperture within at least one of said housings.
  • Sensing apparatus as set forth in claim 6, including a pair of grip rods extending outwardly from said sleeve on opposite sides thereof to define a syringe-type grip with one end of said housings.
  • said clamping means includes coil spring means within said housing for urging said sleeve across said sensing gap.

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Fluid Mechanics (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Theoretical Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
US685928A 1967-11-27 1967-11-27 Drop flow sensor and resilient clamp therefor Expired - Lifetime US3596515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68592867A 1967-11-27 1967-11-27

Publications (1)

Publication Number Publication Date
US3596515A true US3596515A (en) 1971-08-03

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US685928A Expired - Lifetime US3596515A (en) 1967-11-27 1967-11-27 Drop flow sensor and resilient clamp therefor

Country Status (6)

Country Link
US (1) US3596515A (enrdf_load_stackoverflow)
AU (1) AU6294269A (enrdf_load_stackoverflow)
CH (1) CH502106A (enrdf_load_stackoverflow)
DE (1) DE2123113A1 (enrdf_load_stackoverflow)
FR (1) FR2067126A1 (enrdf_load_stackoverflow)
GB (1) GB1252615A (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826137A (en) * 1971-06-02 1974-07-30 E Clarke Method for measuring the rate of flows of liquids
WO1982001653A1 (en) * 1980-11-07 1982-05-27 Corp Ivac Drops sensing unit and associated drip chamber for iv fluid administration
JPS57113148U (enrdf_load_stackoverflow) * 1980-12-30 1982-07-13
US4583975A (en) * 1983-12-23 1986-04-22 Baxter Travenol Laboratories, Inc. Indirect piezoelectric drop counter and method
US4673397A (en) * 1985-08-02 1987-06-16 Baxter Travenol Laboratories, Inc. Splash back reduction drip chamber
US4680977A (en) * 1985-03-06 1987-07-21 Ivac Corporation Optical flow sensor
US4681569A (en) * 1985-03-22 1987-07-21 Coble Stephen J IV rate meter
US4718896A (en) * 1986-01-10 1988-01-12 Abbott Laboratories Apparatus and method for controlling the flow of fluid through an administration set
US4857048A (en) * 1987-05-29 1989-08-15 Hewlett-Packard Company IV pump and disposable flow chamber with flow control
US5154704A (en) * 1990-10-31 1992-10-13 Kent Archibald G IV clamp with tube clip
US5186057A (en) * 1991-10-21 1993-02-16 Everhart Howard R Multi-beam liquid-drop size/rate detector apparatus
USD383206S (en) * 1990-10-22 1997-09-02 Nutricare Medical Products, Inc. Medical fluid drip container
US5982289A (en) * 1998-09-25 1999-11-09 Dowty Aerospace Yakima Drip counter apparatus
US20040037935A1 (en) * 1997-08-15 2004-02-26 Penford Food Ingredients Co. French fry formulations containing rice flour
US6736801B1 (en) 1998-02-18 2004-05-18 George Gallagher Method and apparatus for monitoring intravenous drips
US20050142013A1 (en) * 2001-12-17 2005-06-30 Faries Durward I.Jr. Method and apparatus for heating solutions within intravenous lines to desired temperatures during infusion
US20060224123A1 (en) * 2003-07-09 2006-10-05 Kurt Friedli Device for administering a fluid product comprising optical scanning
US20080051732A1 (en) * 2006-06-23 2008-02-28 Thaiping Chen Drop sensing device for monitoring intravenous fluid flow
US20080147016A1 (en) * 1997-03-03 2008-06-19 Faries Durward I Method and Apparatus for Pressure Infusion and Temperature Control of Infused Liquids
US20080205481A1 (en) * 2007-02-22 2008-08-28 Faries Durward I Method and Apparatus for Measurement and Control of Temperature for Infused Liquids
US7740611B2 (en) 2005-10-27 2010-06-22 Patented Medical Solutions, Llc Method and apparatus to indicate prior use of a medical item
US8487738B2 (en) 2006-03-20 2013-07-16 Medical Solutions, Inc. Method and apparatus for securely storing medical items within a thermal treatment system
US8821011B2 (en) 1999-03-30 2014-09-02 Medical Solutions, Inc. Method and apparatus for monitoring temperature of intravenously delivered fluids and other medical items
US8845586B2 (en) 2004-03-09 2014-09-30 Patented Medical Solutions Llc Method and apparatus for facilitating injection of medication into an intravenous fluid line while maintaining sterility of infused fluids
US9119912B2 (en) 2001-03-12 2015-09-01 Medical Solutions, Inc. Method and apparatus for controlling pressurized infusion and temperature of infused liquids
US9211381B2 (en) 2012-01-20 2015-12-15 Medical Solutions, Inc. Method and apparatus for controlling temperature of medical liquids
US9656029B2 (en) 2013-02-15 2017-05-23 Medical Solutions, Inc. Plural medical item warming system and method for warming a plurality of medical items to desired temperatures

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2624758A1 (de) * 1975-06-11 1976-12-23 British Petroleum Co Vorrichtung zur ueberwachung eines fluessigkeitsstromes
FR2447200A1 (fr) * 1979-01-26 1980-08-22 Etienne Rene Appareil de delivrance goutte a goutte d'un produit de traitement
US4668216A (en) * 1985-03-11 1987-05-26 Ivac Corporation System for mounting a drop sensor to a drip chamber
JPH03231680A (ja) * 1990-02-06 1991-10-15 Terumo Corp 点滴検出機及びそれを備えた点滴警報装置並びに点滴量制御装置
GB9717139D0 (en) * 1997-08-13 1997-10-22 Smiths Industries Plc Urine meter assemblies

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640389A (en) * 1950-10-31 1953-06-02 Perkin Elmer Corp Oximeter
US3150360A (en) * 1961-10-23 1964-09-22 Waukee Eng Co Flowmeter alarm
US3163176A (en) * 1962-03-14 1964-12-29 Barth Engineering And Mfg Comp Apparatus for sensing and controlling fluid flow in the form of discrete free-falling drops
US3390577A (en) * 1965-09-24 1968-07-02 Gen Instrument Corp Monitoring system for fluid flow in drop form

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640389A (en) * 1950-10-31 1953-06-02 Perkin Elmer Corp Oximeter
US3150360A (en) * 1961-10-23 1964-09-22 Waukee Eng Co Flowmeter alarm
US3163176A (en) * 1962-03-14 1964-12-29 Barth Engineering And Mfg Comp Apparatus for sensing and controlling fluid flow in the form of discrete free-falling drops
US3390577A (en) * 1965-09-24 1968-07-02 Gen Instrument Corp Monitoring system for fluid flow in drop form

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826137A (en) * 1971-06-02 1974-07-30 E Clarke Method for measuring the rate of flows of liquids
WO1982001653A1 (en) * 1980-11-07 1982-05-27 Corp Ivac Drops sensing unit and associated drip chamber for iv fluid administration
US4397648A (en) * 1980-11-07 1983-08-09 Ivac Corporation Drop sensing unit and associated drip chamber for IV fluid administration
USRE32294E (en) * 1980-11-07 1986-11-25 Ivac Corporation Drop sensing unit and associated drip chamber for IV fluid administration
JPS57113148U (enrdf_load_stackoverflow) * 1980-12-30 1982-07-13
US4583975A (en) * 1983-12-23 1986-04-22 Baxter Travenol Laboratories, Inc. Indirect piezoelectric drop counter and method
US4680977A (en) * 1985-03-06 1987-07-21 Ivac Corporation Optical flow sensor
US4681569A (en) * 1985-03-22 1987-07-21 Coble Stephen J IV rate meter
US4673397A (en) * 1985-08-02 1987-06-16 Baxter Travenol Laboratories, Inc. Splash back reduction drip chamber
US4718896A (en) * 1986-01-10 1988-01-12 Abbott Laboratories Apparatus and method for controlling the flow of fluid through an administration set
US4857048A (en) * 1987-05-29 1989-08-15 Hewlett-Packard Company IV pump and disposable flow chamber with flow control
USD383206S (en) * 1990-10-22 1997-09-02 Nutricare Medical Products, Inc. Medical fluid drip container
US5154704A (en) * 1990-10-31 1992-10-13 Kent Archibald G IV clamp with tube clip
US5186057A (en) * 1991-10-21 1993-02-16 Everhart Howard R Multi-beam liquid-drop size/rate detector apparatus
US8920387B2 (en) 1997-03-03 2014-12-30 Medical Solutions, Inc. Method and apparatus for pressure infusion and temperature control of infused liquids
US7942851B2 (en) 1997-03-03 2011-05-17 Medical Solutions, Inc. Method and apparatus for pressure infusion and temperature control of infused liquids
US20080147016A1 (en) * 1997-03-03 2008-06-19 Faries Durward I Method and Apparatus for Pressure Infusion and Temperature Control of Infused Liquids
US8313462B2 (en) 1997-03-03 2012-11-20 Medical Solutions, Inc. Method and apparatus for pressure infusion and temperature control of infused liquids
US20040037935A1 (en) * 1997-08-15 2004-02-26 Penford Food Ingredients Co. French fry formulations containing rice flour
US6736801B1 (en) 1998-02-18 2004-05-18 George Gallagher Method and apparatus for monitoring intravenous drips
US5982289A (en) * 1998-09-25 1999-11-09 Dowty Aerospace Yakima Drip counter apparatus
US8821011B2 (en) 1999-03-30 2014-09-02 Medical Solutions, Inc. Method and apparatus for monitoring temperature of intravenously delivered fluids and other medical items
US9119912B2 (en) 2001-03-12 2015-09-01 Medical Solutions, Inc. Method and apparatus for controlling pressurized infusion and temperature of infused liquids
US8920372B2 (en) 2001-12-17 2014-12-30 Medical Solutions, Inc. Method and apparatus for heating solutions within intravenous lines to desired temperatures during infusion
US9492624B2 (en) 2001-12-17 2016-11-15 Medical Solutions, Inc. Method and apparatus for heating solutions within intravenous lines to desired temperatures during infusion
US8226605B2 (en) 2001-12-17 2012-07-24 Medical Solutions, Inc. Method and apparatus for heating solutions within intravenous lines to desired temperatures during infusion
US20050142013A1 (en) * 2001-12-17 2005-06-30 Faries Durward I.Jr. Method and apparatus for heating solutions within intravenous lines to desired temperatures during infusion
US20060224123A1 (en) * 2003-07-09 2006-10-05 Kurt Friedli Device for administering a fluid product comprising optical scanning
US8845586B2 (en) 2004-03-09 2014-09-30 Patented Medical Solutions Llc Method and apparatus for facilitating injection of medication into an intravenous fluid line while maintaining sterility of infused fluids
US8636691B2 (en) 2005-10-27 2014-01-28 Patented Medical Solutions, Llc Method and apparatus to indicate prior use of a medical item
US8444599B2 (en) 2005-10-27 2013-05-21 Patented Medical Solutions, Llc Method and apparatus to indicate prior use of a medical item
US7740611B2 (en) 2005-10-27 2010-06-22 Patented Medical Solutions, Llc Method and apparatus to indicate prior use of a medical item
US8487738B2 (en) 2006-03-20 2013-07-16 Medical Solutions, Inc. Method and apparatus for securely storing medical items within a thermal treatment system
US20080051732A1 (en) * 2006-06-23 2008-02-28 Thaiping Chen Drop sensing device for monitoring intravenous fluid flow
US8226293B2 (en) 2007-02-22 2012-07-24 Medical Solutions, Inc. Method and apparatus for measurement and control of temperature for infused liquids
US20080205481A1 (en) * 2007-02-22 2008-08-28 Faries Durward I Method and Apparatus for Measurement and Control of Temperature for Infused Liquids
US9211381B2 (en) 2012-01-20 2015-12-15 Medical Solutions, Inc. Method and apparatus for controlling temperature of medical liquids
US9764100B2 (en) 2012-01-20 2017-09-19 Medical Solutions, Inc. Method and apparatus for controlling temperature of medical liquids
US9656029B2 (en) 2013-02-15 2017-05-23 Medical Solutions, Inc. Plural medical item warming system and method for warming a plurality of medical items to desired temperatures

Also Published As

Publication number Publication date
AU6294269A (en) 1971-04-29
CH502106A (de) 1971-01-31
DE2123113A1 (de) 1972-11-23
GB1252615A (enrdf_load_stackoverflow) 1971-11-10
FR2067126A1 (enrdf_load_stackoverflow) 1971-08-20

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AS Assignment

Owner name: NEW IVAC, INC., CALIFORNIA

Free format text: MERGER;ASSIGNOR:IVAC CORPORATION;REEL/FRAME:004047/0648

Effective date: 19771130

Owner name: NEW IVAC, INC.

Free format text: MERGER;ASSIGNOR:IVAC CORPORATION;REEL/FRAME:004047/0648

Effective date: 19771130