Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3776229 A
Publication typeGrant
Publication dateDec 4, 1973
Filing dateNov 26, 1971
Priority dateNov 26, 1971
Also published asCA1000149A1, DE7236504U
Publication numberUS 3776229 A, US 3776229A, US-A-3776229, US3776229 A, US3776229A
InventorsMc Phee C
Original AssigneeAmerican Hospital Supply Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Medical liquid administration set for rate or volume delivery
US 3776229 A
Abstract
A parenteral liquid administration set which is readily changeable between delivering liquid at measured "rate" through a drip chamber that has a constant liquid level, and delivering liquid from the chamber in a measured "volume" with a progressively lowering liquid level. A valve system on a top of an enlarged semi-rigid measuring chamber functions to selectively change between "rate" and "volume" delivery. In one version there is also a secondary drip chamber below the enlarged semi-rigid measuring chamber so the set can simultaneously indicate "rate" and "volume" delivery.
Images(3)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent McPhee Dec. 4, 1973 [54] MEDICAL LIQUID ADMINISTRATION SET 3,437,224 4/1969 Williams 215/56 FOR RATE VOLUME DELWERY FOREIGN PATENTS OR APPLICATIONS [75] lnvemo Charles Mcphee Sylmar Calif 438,611 11/1935 Great Britain 128/214 c [73] Assignee: American Hospital Corporation,

Evanston, Ill. Primary Examiner-Dalton L. Truluck [22] Filed: Nov. 26 1971 Attorney-Larry N. Barger et al.

[21] Appl. No.: 202,505 ABSTRACT A parenteral liquid administration set which is readily [52] US. Cl. 128/214 C, 222/159, 22221317526, changeable between delivering liquid at measured rate through a drip chamber that has a constant liqg uid level, and delivering liquid from the chamber in a 1 le 0 588/25 1 I 5 measured volume with a progressively lowering liq- 1 1 442 215/56 uid level. A valve system on a top of an enlarged semi- I rigid measuring chamber functions to selectively change between rate and volume delivery. In one [56] References Cited version there is also a secondary drip chamber below UNITED STATES PATENTS the enlarged semi-rigid measuring chamber so the set 3,216,419 11/1965 Scislowicz 128/214 C 'can simultaneously indicate rate" and volume de- 2,3l3,2l9 3/1943 Bulling..... li 2,817,372 11/1957 Barret al. 3,216,4l8 11/ 1965 Scislowicz 128/214 C 14 Claims, 8 Drawing Figures MEDICAL LIQUID ADMINISTRATION SET FOR RATE OR VOLUME DELIVERY BACKGROUND Parenteral liquids such as intravenous solution or blood are generally dispensed to a patient through an "administration set. The adminstration set includes a long flexible tube connected at its upper end to an inverted liquid supply bottle and connected at its bottom end to a patient. An enlarged drip chamber is joined in series with the tubing between its ends. A nurse or physician can determine how fast the parenteral liquid is being administered by counting the drops falling into the drip chamber over a given period of time. The rate of liquid administration in ml/hr. is then calculated from the drip rate by a known conversion factor.

The problem with drip chambers of this type is that they do not provide an easy manner of measuring both rate and volume delivery. First the nurse or physician has to count the number of drops per minute and convert them into ml/hr. for the rate." Then if a specific volume is to be administered at this rate a further calculation is needed to determine how long the administration should be continued to deliver this volume. For instance, if a physician told a nurse to administer 40 ml. of liquid at 25 ml/hr. this becomes quite a tedious mathematical problem. This is particularly burdensome where a nurse might monitor several different parenteral liquid administrations simultaneously. Calibrations on the large liquid supply bottle, one or'two liter capacity, are not accurate enough for measuring volumes of less than 100 ml.

SUMMARY OF THE INVENTION 1 have overcome the above problems with the parenteral liquid administration set by providing an administration set which can be conveniently changed by a nurse or physician to indicate a rate or volume delivered. The rate is measured by a constant liquid level drip chamber and the volume is measured by a descending liquid level within an enlarged semi-rigid chamber. This chamber has approximately 100 ml. capacity and is volumetrically calibrated.

An important feature of my invention is a unique valving structure at a top portion of the enlarged chamher. When the valving structure is closed the chamber forms an airtight drip housing where liquid is received and dispensed while liquid in the chamber remains at an approximately constant level. When the valving structure is opened to the atmosphere, the chamber is filled to a given volumetric level and liquid dispensed from the chamber in a progressively lowering liquid level gives an instant reading of volume dispensed. As this level reaches a lower portion of the chamber an automatic float valve closes the chambers outlet passage to prevent air from being administered to the patient.

In one version of my invention a secondary drip chamber is attached to an outlet of the enlarged chamber. Thus, as liquid drains from the enlarged chamber in a volumetrically measured administration the secondary drip chamber will give a simultaneous rate reading in the number of drops falling into the secondary chamber.

With my invention a nurse or physician can get a quick and easy reading of the rate liquid is being administered, and also obtain a convenient accurate reading of how much volume has been dispensed.

THE DRAWINGS FIG. 1 is a side elevational .view showing the administration set measuring the rate of liquid dispensed;

FIG. 2 is a side elevational view similar to FIG. 1, but showing the volume dispensed;

FIG. 3 is an enlarged sectional view of a top cap of the enlarged chamber, showing an upstanding rigid tube portion of the valve structure;

FIG. 4 is an enlarged sectionalvie'w of a rotatable cap member fitting over the rigid tube of the cap and com bining with it to form the valve;

FIG. 5 is a bottom view of the cap of FIG. 4; FIG. 6 is a sectional view taken along 6-6 of FIG.

FIG. 7 is a fragmentary top view taken along line 7-7 of FIG. 3; and

FIG. 8 is an exploded perspective view of the top portion of the enlarged housing with its rigid upstanding tube, and the valve cap.

DETAILED DESCRIPTION The parenteral liquid administration set of my invention includes a conduit 1 that has a spike 2 at its upper end connected to a liquid supply bottle 3. This bottle may contain blood, intravenous solution, etc. A lower end of the conduit 1 is attached to a conventional intravenous needle (not shown).

Joined in series with this conduit 1 is an enlarged chamber 4 shown in the drawings :as being of approximately ml. capacity. This could also be of ml. capacity if desired. The enlarged chamber is comprised of a cylindrical transparent wall 5 with volumetrically calibrated indicia 6. Connected to this cylindrical wall are a top cap 7 and a bottom cap 8 which have an inlet passage 9 and an outlet passage 10 respectively. To control liquid flow rates to and from the enlarged chamber are conventional roller clamps 11 and 12 on the conduit 1.

In FIG. 1 there is shown a secondary smaller drip chamber 13 connected to bottom cap 8. This secondary drip chamber will be explained in more detail later and how it is used with the enlarged chamber 4 to simultaneously measure rate and. volume" delivery. However, the enlarged chamber 4 can be used to measure both rate and volume delivery by manually changing a valve on top' cap 7. In this later instance there is no secondar drip chamber and conduit 1 connects directly to outlet 10 of the enlarged chamber 4.

1 Having discussed the basic components of the administration set, the details of the enlarged chamber 4 and particularly its top cap 7 will be described. As shown in FIG. 1 the administration set is delivering a constant measurable rate of liquid. This rate is determined by counting the number of drops 14 falling across an air pocket 15 directly above a liquid level 16. In FIG. 1, where the rate delivery is shown, the roller clamp 1 1 is open so liquid can drain from bottle 3 into chamber 4. A valve means on the top cap shown generally as 17, is in an airtight closed position. This creates an airtight enlarged chamber 4 which functions as a drip housing and a liquid level 16 remains at a generally constant mosphere. This causes the liquid level 16 shown in FIG. 2 as initially being at 65 ml. to drop to the level shown in solid line, i.e., 45 ml. Any amount of liquid up to the enlarged chambers capacity can be supplied to it merely by opening roller clamp 11. In both the FIG. 1 and FIG. 2 showing settings the flow rate to the patient is controlled by roller clamp 12.

In practice, a nurse or physician can begin a liquid administration as shown in FIG. 1 at perhaps 300 ml/hr. If the physician gives an instruction to administer 65 more ml. at this rate and then stop the administration the nurse needs merely to open valve 17 and fill the enlarged chamber 4 to 65 ml. Next, roller clamp 11 is closed off. As the liquid within the chamber 4 is dispensed at the constant 300 ml/hr. (controlled by'roller clamp 12) the liquid level 16 will gradually descend within the enlarged chamber 4. This liquid level descent continues until a floating disc valve 20 within cage 21 contacts valve seat 22 to close off further passage of liquid or air through outlet 9 of the bottom cap. As can be seen, this is a very simple procedure and the nurse does not need to calculate how many minutes a 300 ml/hr. rate of liquid delivery would have to be run to deliver 65 ml. of liquid to the patient.

If, after delivering the 65 ml., the physician decides that he wants to resume the parenteral liquid delivery at a constant rate until bottle 3 is empty the nurse simply closes off valve 17 and partially refills enlarged chamber 4 while valve 11 remains open. Next, valve 17 is closed and administration of liquid at the drip rate desired is controlled by roller clamp 12. Alternatively, the enlarged semi-rigid chamber 4 can be partially filled with liquid after valve 17 is closed. This is done by slightly squeezing the transparent wall and releasing it to suck liquid back into the enlarged chamber. Such squeezing and filling procedure is conventional.

Having described the method by which the administration set' of my invention can be changed to indicate a rate or a volume delivery. The details of the specific top cap 8 and valve system which accomplishes this will be explained. As shown in FIG. 3, the top cap 7 includes top wall 23 and a pair of downwardly extending skirts 24 and 25 which are cemented or otherwise bonded to tubular wall 5 of the enlarged chamber. The top wall has an inlet opening surrounded by a drip tube structure 26. Fitting within this drip tube structure is flexible conduit 1. Thus as liquid drains from bottle 3 through conduit 1 it forms a drip on the drip tube 26 within the enlarged chamber.

Top wall 23 has an upstanding tube 27 closed by a puncture pad 28 for injecting additional medication into the enlarged chamber. Injections into the chamber can be made through this puncture pad whether the system delivering is in FIG. 1, or as in FIG. 2.

The valve 17 on the top wall 23, of top cap 8, includes a large upstanding rigid tube 29 in FIG. 3 surrounding a vent port 30 through the top wall 23. Fltting over this upstanding tube 29 is a rotatable cap 31 with a laterally protruding handle 32. This cap and upstanding tube 29 form an airtight fit with siliconized.

surfaces. The closure has a circumference rib 34 of the upstanding tube 29. Extending upwardly from a lower end 34 of the cap is a vertical groove 35. This groove 35 stops short of top wall 36 of the cap. The upstanding tube 29 also has a vertical groove 37 which extends from its top wall 38 downwardly but stops short of top wall 23 of cap 8. The two vertical grooves 37 and 35 overlap at a center portion of the valve when the cap is fitted to the upstanding tube 29. How this overlapping relationship works is probably best illustrated in the exploded perspective view of FIG. 8.

To limit its rotational movement to less than 360 cap 31 has an internal radial groove 39 extending partially around its periphery. At each end of groove 39 are shoulders 40 and 41. These shoulders abut a stop lug 42 at a base of the upstanding tube 29. When shoulder 41 abuts lug 42 the grooves 35 and 37 are aligned for passage of air through vent passage tube 29. When shoulder 40 abuts lug 42 the grooves 35 and 37 are sufficiently misaligned that air is prevented from passing through vent passage 30.

Vent passage 30 of upstanding tube 29 has a filter member 43 there across which is solvent or sonic welded to the tube 29. This filter member is of porous polymeric sheet material such as Teflon that is pervious to air but impervious to liquid. The purpose of filter 43 is to keep any splashing liquid from the enlarged chamber 4 from contaminating the inner connecting air passages 35 and 37.

As shown in FIG. 8 the cap has been exploded away from the upstanding tube 29. This is merely for purposes of illustration and the cap and upstanding tube as actually used would be snapped together. Preferably lettering 44 is included on the cap to indicate which direction to turn of opening and closing the valve.

In the above description and drawings I have described an enlarged chamber 4 which can give an indication of rate or volume parenteral liquid delivery, depending on how the valve 17 is turned. It is also possible to get simultaneous readings of these two measurements. This is done by including a secondary drip 13. Referring to FIG. 2 the secondary drip chamber 13 can indicate a flow rate simultaneously with the volume measuring liquid level lowering operation of enlarged chamber 4. If desired, the drip forming tube 45 within secondary drip member 13 can be of a much smaller diameter than drip tube 26. This can be a small drip formerly known as a pediatric drip for administering at very slow rates to infants.

In the above specification and drawings I have used specific examples to illustrate my invention. However, it is obvious to those skilled in the art that certain modifications and changes can be made to these embodiments without departing from the spirit and scope of the invention.

I claim:

1. A system comprising an administration set for optionally dispensing medical liquid by a continuous rate in drops or as a measured volume without disconnecting the administration set from a liquid supply source, comprising in combination:

a liquid supply container having a lower outlet through which liquid descends; a supply of medical liquid in said container; a calibrated-volume housing including a transparent tubular wall having top and bottom end closures; said top end closure having an inlet opening and said bottom end closure having an outlet opening; a filling conduit connected in series between the outlet opening of said liquid container and the inlet opening of said top end closure,

said filling conduit being substantially smaller in cross section than either the liquid supply container or the calibrated volume housing,

said top end closure including a drip tube connected to said fluid conduit and depending into said housing and including a terminal discharge end substantially immediately below said top end closure and being of a size for forming countable drops of the medical liquid as it drops onto a level of liquid in said housing;

a first two-position valve having open closed settings and being interposed in said filling conduit for controlling the flow of liquid into said housing from said liquid supply container; said top end closure having an air vent means for connecting the housing to atmospheric pressure;

a second two-position valve having openclosed settings and being connected to said air vent for sealing off the interior of the housing from atmospheric pressure or opening the interior of the housing to atmospheric pressure thereto; and

a dispensing conduit substantially smaller in cross section than said housing and connected to the bottom end closure outlet opening, said set providing means for administering liquid as a continuous rate directly from the liquid supply container or as a measured volume from the housing when one of said valves is in an open setting and the other is in an closed setting.

2. The combination as set forth in claim 1 wherein the chamber has an upstanding rigid tube around its vent opening with a passage through the tube into the chamber, and a filter member spans this passage.

3. The combination as set forth in claim 2 wherein the manually openable closure forms an airtight fit with the upstanding tube and is rotatable relative thereto, and said upstanding tube and closure having alignable groove systems.

4. The combination as set forth in claim 3 wherein the cap has a laterally extending handle to provide a visual indication of its angular position showing whether the vent passage is open or closed.

5. The combination as set forth in claim 3 wherein the upstanding rigid tube has a groove system on its outer surface and said closure system is a cap fitting over said upstanding tube, said cap having a groove system on its inner surface.

6. The combination as set forth in claim 5 wherein the cap has a vertical groove along a lower portion of its inner surface; theupstanding rigid tube has a vertical groove along its upper portion; and said two vertical grooves overlapping when they are rotationally aligned with each other, so that air can enter and exit through the aligned interconnecting grooves.

7. The combination as set forth in claim 5 wherein the system has rotational limit stop means to confine the closure rotation of the cap on the upstanding tube to less than 360.

8. The combination as set forth in claim 7 wherein the rotational stop means is a protruding lug at a base of the upstanding tube, and the cap has a generally cylindrical wall with an internal radial slot that receives this lug, said cap having abutting shoulders at opposite ends of said. slot for contacting the lug.

9. The combination as set forth in claim 8 wherein one shoulder abuts the stop means when the grooves are rotationally aligned for air passage, and the other shoulder abuts the lug when the grooves are sufficiently misaligned so as to fully shut off air passage through the vent opening.

10. The combination as set forth in claim 5 wherein the cap and upstanding tube have interfitting circumferential groove and rib structure to maintain the cap and upstanding tube together as the cap rotates on the upstanding tube.

11. The combination as set forth in claim 1 wherein the liquid outlet opening has an upwardly facing valve seat therearound, and the chamber has a floating valve member that seals against the valve seat when the vent passage is open and the liquid level within the chamber has dropped to approximately the level of the valve seat.

12. The combination as set forth in claim 1 wherein the set has a secondary drip housing connected to a lower portion of the volumetrically calibrated chamber about the liquid outlet opening, and there is a drip forming tube surrounding the liquid outlet passage and extending into the secondary drip chamber, said secondary drip chamber having a drain port at a lower portion thereof.

13. The combination as set forth in claim 12 wherein the set has conduit means connected to the inlet of the volumetrically calibrated chamber and also has conduit means connected to the drain port of the secondary drip chamber, both of said conduits having liquid flow control valves thereon.

14. A parenteral liquid administration set for selectively dispensing medical liquid by either continuous drip or measured volume, said set including: an enlarged chamber that includes a cylindrical transparent wall with volumetrically calibrated indicia thereon; a top cap fitted to an upper end of the cylindrical wall, said top cap including a liquid inlet opening with an external tubular connector and an internal drip tube about the liquid inlet opening; a filling conduit substantially smaller in diameter than the cylindrical wall, which filling conduit is connected to the liquid opening of the top end; a first valve connected with the filling conduit for opening or closing a passage through the filling conduit; partially along its vertical length, said groove stopping short of the base of the upstanding tube; a circumferential rib on the upstanding tube; an air pervious, liquid impervious filter closing off the passage through said upstanding tube; a cap fitting over and rotationally mounted on the rigid upstanding tube; an internal vertical groove within the cap which vertical groove interconnects with the upstanding tubes external groove at-one particular rotational position of the cap, whereby air is admitted into said chamber, said cap rotatable about the upstanding tube to close said vents air passage; said cap having a circumferential internal groove which receives the rib of the upstanding tube; lateral rotational stop means on the cap and upstanding tube; a bottom cap connected to the transpar ent cylindrical wall and having an outlet port therein; a float valve means within the calibrated chamber for closing off its outlet as liquid drops to approximately the level of the outlet; a secondary drip chamber connected to the liquid outlet of the calibrated chamber; said parenteral liquid administration set adapted to deliver parenteral liquid at a continuous drip or a measured volume when only one, but not both, of

the two valves is in an open position.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2313219 *Jul 16, 1940Mar 9, 1943Bulling Herman EFluid dispensing container
US2817372 *Mar 21, 1955Dec 24, 1957Barr John WTransfusion assembly
US3216418 *Jun 1, 1962Nov 9, 1965Abbott LabApparatus for administering parenteral solutions
US3216419 *Oct 17, 1963Nov 9, 1965Abbott LabApparatus for administering a parenteral solution provided with a diaphragm float valve
US3437224 *Jan 18, 1967Apr 8, 1969Dover Molded Products CoVial closure
GB438611A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3941126 *Aug 8, 1974Mar 2, 1976Dietrich Joseph WApparatus for long term intravenous administration of diluted incompatible multiple medications
US3951145 *Oct 25, 1973Apr 20, 1976Bob Lee SmithIntravenous measuring chamber
US3954623 *May 28, 1974May 4, 1976Johnson & JohnsonBlood filtration unit
US3965895 *Aug 21, 1974Jun 29, 1976Cutter Laboratories, Inc.Apparatus for controlled volume and rate administration of liquids
US3976068 *Jan 3, 1975Aug 24, 1976Origo, Inc.Drug dispenser for use with intravenous feeding pump
US3982534 *Jan 10, 1975Sep 28, 1976Buckman Thomas PIntravenous administration system
US3993066 *Nov 1, 1974Nov 23, 1976Baxter Laboratories, Inc.Burette chamber for use with intravenous solution administration set
US4269222 *Mar 27, 1979May 26, 1981Palti Yoram ProfConstant flow device
US4292969 *Dec 19, 1979Oct 6, 1981Raible Donald AFluid regulating device with torsional control
US4294249 *Oct 18, 1979Oct 13, 1981Cutter Laboratories, Inc.Swage-molded injection site
US4332247 *Jul 21, 1980Jun 1, 1982Baxter Travenol Laboratories, Inc.Administration set including burette with pivotable air valve
US4355639 *Jul 8, 1980Oct 26, 1982Sis-Ter S.P.A.Apparatus for the parenteral administration of liquids at a constant, adjustable flow rate
US4432760 *Feb 22, 1982Feb 21, 1984Baxter Travenol Laboratories, Inc.Administration set including burette with pivotable air valve
US4610374 *Oct 29, 1984Sep 9, 1986Dougherty Brothers CompanyApparatus for mixing flowable materials in sealed containers
US4735608 *May 14, 1986Apr 5, 1988Del F. KahanApparatus for storing and reconstituting antibiotics with intravenous fluids
US5188620 *Jun 14, 1990Feb 23, 1993Baxter International Inc.Pre-slit injection site and associated cannula
US5211638 *Jan 21, 1992May 18, 1993Baxter International Inc.Pre-slit injection site
US5242424 *Mar 1, 1993Sep 7, 1993Chen Yueh HorngDevice for use in controlling intravenous drip
US5300034 *Jul 29, 1992Apr 5, 1994Minnesota Mining And Manufacturing CompanyIv injection site for the reception of a blunt cannula
US5351383 *Apr 2, 1993Oct 4, 1994Minnesota Mining And Manufacturing CompanyMethod of making an injection or sampling site
US5400500 *Jul 1, 1994Mar 28, 1995Minnesota Mining And Manufacturing CompanyApparatus for making an injection or sampling site
US5423751 *Feb 18, 1993Jun 13, 1995Harrison; Samuel W.Contrast media dispensing apparatus
US5593385 *Mar 24, 1995Jan 14, 1997Harrison; Samuel W.Contrast media dispensing apparatus
US5658260 *Jul 29, 1996Aug 19, 1997Baxter International Inc.Bayonet lock cannula for pre-slit y-site
US5776125 *Apr 24, 1995Jul 7, 1998Baxter International Inc.Needleless vial access device
US5779674 *May 6, 1996Jul 14, 1998Mallinckrodt Medical, Inc.Fluid gas removal drip chamber
US5797897 *Jun 6, 1995Aug 25, 1998Baxter International Inc.Pre-slit injection site and tapered cannula
US5871500 *Jan 5, 1996Feb 16, 1999Baxter International Inc.Pre-slit injection site and tapered cannula
US6162206 *Dec 23, 1997Dec 19, 2000Baxter International Inc.Resealable access site
US6193697Apr 9, 1999Feb 27, 2001Baxter International Inc.Pre-slit injection site and tapered cannula
US6213996Oct 29, 1998Apr 10, 2001Baxter International Inc.Pre-slit injection site and tapered cannula
US6217568May 12, 1995Apr 17, 2001Edwards Lifesciences CorporationPreslit injection site and tapered cannula for blood sampling
US6261266Oct 29, 1998Jul 17, 2001Baxter International Inc.Pre-slit injection site and tapered cannula
US6261267 *Oct 9, 1998Jul 17, 2001Globe Enterprises, Inc.Automatic IV shut off valve
US6321597 *May 28, 1999Nov 27, 2001Deka Products Limited PartnershipSystem and method for measuring volume of liquid in a chamber
US6447498Oct 29, 1998Sep 10, 2002Baxter International Inc.Pre-slit injection site and tapered cannula
US6520937Dec 18, 2000Feb 18, 2003Scimed Life Systems, Inc.Fluid injection device
US6554806Feb 5, 2001Apr 29, 2003Alaris Medical Systems, Inc.Burette safety valve
US6569125Jul 17, 2001May 27, 2003Baxter International IncPre-slit injection site and tapered cannula
US6605076Aug 9, 1996Aug 12, 2003Baxter International Inc.Pre-slit injection site and tapered cannula
US6972000 *Aug 25, 2003Dec 6, 2005Nellcor Puritan Bennett IncorporatedManual/auto-prime air eliminator
US7828769Nov 7, 2005Nov 9, 2010Nellcor Puritan Bennett LlcManual/auto-prime air eliminator
US8070730Feb 25, 2010Dec 6, 2011Tyco Healthcare Group LpIntegral insufflation valve
CN101229403BFeb 27, 2008Jun 2, 2010龚明秀Murphy's burette
DE2540121A1 *Sep 9, 1975Apr 1, 1976United States Surgical CorpVolumenbegrenzungskammer
EP1034812A2 *Mar 13, 2000Sep 13, 2000Medtronic, Inc.Hydrophobic vent incorporated into cerebral spinal fluid drainage chamber
WO1997041904A1 *Mar 25, 1997Nov 13, 1997Mallinckrodt Medical IncFluid gas removal drip chamber
WO2002062473A2 *Feb 1, 2002Aug 15, 2002Alaris Medical Syst IncImproved burette safety valve
Classifications
U.S. Classification604/127, 604/254, 222/442, 222/159, 215/313, 604/248
International ClassificationA61M5/14, A61M5/168
Cooperative ClassificationA61M5/1412, A61M5/1411
European ClassificationA61M5/14H, A61M5/14F
Legal Events
DateCodeEventDescription
May 26, 1992ASAssignment
Owner name: MCGAW, INC. A CORP. OF DELAWARE
Free format text: SECURITY INTEREST;ASSIGNOR:WELLS FARGO BANK, N.A.;REEL/FRAME:006139/0057
Effective date: 19920401
Nov 21, 1990ASAssignment
Owner name: KENDALL MCGAW LABORATORIES, INC., AN OH CORP.
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MANUFACTURERS HANOVER TRUST COMPANY;REEL/FRAME:005515/0206
Effective date: 19901015
Nov 21, 1990AS17Release by secured party
Owner name: KENDALL MCGAW LABORATORIES, INC., AN OH CORP.
Owner name: MANUFACTURERS HANOVER TRUST COMPANY
Effective date: 19901015
Oct 24, 1990ASAssignment
Owner name: KENDALL MCGAW LABORATORIES, INC. AN OH CORPORAT
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MANUFACTURERS HANOVER TRUST COMPANY;REEL/FRAME:005709/0001
Effective date: 19901015
Oct 23, 1990ASAssignment
Owner name: WELLS FARGO BANK, N.A.
Free format text: SECURITY INTEREST;ASSIGNOR:MCGAW, INC., A CORP. OF OH;REEL/FRAME:005477/0809
Effective date: 19901022
Jul 14, 1986ASAssignment
Owner name: KENDALL MCGAW LABORATORIES, INC., 2525 MCGAW AVENU
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 26, 1985.;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION, A CORP OF IL;REEL/FRAME:004600/0460
Effective date: 19851126
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION, A CORP OF IL;REEL/FRAME:4600/460
Owner name: KENDALL MCGAW LABORATORIES, INC., A CORP OF OH,CAL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION, A CORP OF IL;REEL/FRAME:004600/0460