IP Library › Granted Patent US 12,392,335
Granted Patent B2
US 12,392,335 · App. 17/835,500 · Granted Aug 19, 2025

Medical fluid pumping system having backflow prevention

Inventor: Troy J. Orr (Draper, UT)
Assignees: Baxter International Inc.; Baxter Healthcare SA
F04B43/06A61M1/14A61M5/14224A61M60/113F04B7/0275F04B23/04F04B43/0736F04B45/043F04B45/0536A61N2005/1021F04B2201/0601F04B2201/0605
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Quick Facts
Patent No.
US 12,392,335
App. No.
17/835,500
Granted
Aug 19, 2025
Kind
B2
Abstract

A medical fluid pumping system includes a medical fluid pump for pumping a process fluid and a medical fluid chassis operable with the medical fluid pump. The medical fluid pump includes a first pump chamber, a first inlet valve chamber including a first inlet valve diaphragm, a first outlet valve chamber, a second pump chamber, a second inlet valve chamber including a second inlet valve diaphragm, and a second outlet valve chamber. The medical fluid chassis includes a motive fluid source providing motive fluid at a motive fluid pressure. The first and second inlet valve diaphragms are configured to actuate from an open to a closed position at a pressure less than the motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.

Claims (38)

1. A medical fluid pumping system comprising:

a medical fluid pump for pumping a process fluid, the medical fluid pump including

a first pump chamber,

a first inlet valve chamber in fluid communication with the first pump chamber, the first inlet valve chamber including a first inlet valve diaphragm,

a first outlet valve chamber in fluid communication with the first pump chamber,

a second pump chamber,

a second inlet valve chamber in fluid communication with the second pump chamber, the second inlet valve chamber including a second inlet valve diaphragm,

a second outlet valve chamber in fluid communication with the second pump chamber,

a first valve seal separate from the first inlet valve diaphragm and configured to compress the first inlet valve diaphragm around the first inlet valve chamber, wherein the first valve seal comprises an o-ring configured to fit into a groove surrounding the first inlet valve chamber, and

a second valve seal separate from the second inlet valve diaphragm and configured to compress the second inlet valve diaphragm around the second inlet valve chamber, wherein the second valve seal comprises an o-ring configured to fit into a groove surrounding the second inlet valve chamber; and

a medical fluid chassis operable with the medical fluid pump, the medical fluid chassis including a motive fluid source providing a motive fluid at a motive fluid pressure, wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a differential pressure less than the motive fluid pressure to mitigate a process fluid backflow through the first and second inlet valve chambers.

2. The medical fluid pumping system of claim 1 , wherein the process fluid includes blood and the motive fluid includes air.

3. The medical fluid pumping system of claim 1 , wherein the first and second inlet valve diaphragms are provided via a same one or more diaphragm sheet.

4. The medical fluid pumping system of claim 1 , wherein the first and second inlet valve diaphragms are separate diaphragms.

5. The medical fluid pumping system of claim 1 , further comprising at least one of a first pump diaphragm provided with the first pump chamber, a second pump diaphragm provided with the second pump chamber, a first outlet valve diaphragm provided with the first outlet valve chamber, or a second outlet valve diaphragm provided with the second outlet valve chamber.

6. The medical fluid pumping system of claim 1 , wherein at least one of the first or second inlet valve diaphragms includes additional support where the at least one of the first or second inlet valve diaphragms is seated in a valve seat of the respective first or second inlet valve chamber.

7. The medical fluid pumping system of claim 1 , wherein at least one of the first or second inlet valve diaphragms includes a preformed dome.

8. The medical fluid pumping system of claim 1 , wherein the first and second inlet valve diaphragms are configured to actuate from the open position to the closed position when the differential pressure is between 5 mmHg and 200 mmHg.

9. The medical fluid pumping system of claim 1 , wherein the motive fluid pressure is substantially 300 mmHg.

10. The medical fluid pumping system of claim 1 , wherein the motive fluid source includes a positive motive fluid source, and also includes a negative motive fluid source for actuating the first and second inlet valve diaphragms and first and second outlet valve diaphragms from closed positions to open positions.

11. The medical fluid pumping system of claim 10 , wherein the first and second outlet valve diaphragms of the first and second outlet valve chambers, respectively, are configured to actuate from the closed position to the open position when the differential pressure is less than a negative motive fluid pressure held by the negative motive fluid source to mitigate process fluid backflow through the first and second outlet valve chambers.

12. The medical fluid pumping system of claim 10 , wherein the positive and negative motive fluid sources are separated from motive fluid portions of the first pump chamber, the first inlet valve chamber, the first outlet valve chamber, the second pump chamber, the second inlet valve chamber, and the second outlet valve chamber by a motive fluid valve.

13. The medical fluid pumping system of claim 12 , wherein in a first state the motive fluid valve allows (i) a positive motive fluid pressure to be supplied from the positive motive fluid source to the motive fluid portions of the first pump chamber, the first inlet valve chamber, and the second outlet valve chamber and (ii) a negative motive fluid pressure to be supplied from the negative motive fluid source to the motive fluid portions of the first outlet valve chamber, the second pump chamber, and the second inlet valve chamber.

14. The medical fluid pumping system of claim 13 , wherein in a second state the motive fluid valve allows (i) the positive motive fluid pressure to be supplied from the positive motive fluid source to the motive fluid portions of the second pump chamber, the second inlet valve chamber, and the first outlet valve chamber and (ii) the negative motive fluid pressure to be supplied from the negative motive fluid source to the motive fluid portions of the second outlet valve chamber, the first pump chamber, and the first inlet valve chamber.

15. A medical fluid pump for pumping a process fluid, the medical fluid pump comprising:

a first pump chamber;

a first inlet valve chamber in fluid communication with the first pump chamber, the first inlet valve chamber including a first inlet valve diaphragm;

a first outlet valve chamber in fluid communication with the first pump chamber;

a second pump chamber;

a second inlet valve chamber in fluid communication with the second pump chamber, the second inlet valve chamber including a second inlet valve diaphragm;

a second outlet valve chamber in fluid communication with the second pump chamber;

a first valve seal separate from the first inlet valve diaphragm and configured to compress the first inlet valve diaphragm around the first inlet valve chamber, wherein the first valve seal comprises an o-ring configured to fit into a groove surrounding the first inlet valve chamber; and

a second valve seal separate from the second inlet valve diaphragm and configured to compress the second inlet valve diaphragm around the second inlet valve chamber, wherein the second valve seal comprises an o-ring configured to fit into a groove surrounding the second inlet valve chamber,

wherein the first and second inlet valve diaphragms are configured to actuate from an open position to a closed position at a differential pressure less than a supplied motive fluid pressure to mitigate a process fluid backflow through the first and second inlet valve chambers.

16. The medical fluid pump of claim 15 , wherein at least one of the first or second inlet valve diaphragms includes additional support where the at least one of the first or second inlet valve diaphragms is seated in a valve seat of the respective first or second inlet valve chamber.

17. The medical fluid pump of claim 15 , wherein at least one of the first or second inlet valve diaphragms includes a preformed dome.

18. The medical fluid pump of claim 15 , wherein the first and second inlet valve diaphragms are configured to actuate from the open position to the closed position when the differential pressure is between 5 mmHg and 200 mmHg.

19. The medical fluid pump of claim 15 , wherein at least one of the first pump chamber, the first inlet valve chamber, the first outlet valve chamber, the second pump chamber, the second inlet valve chamber, and the second outlet valve chamber is formed via at least one rigid plate.

Assignments (5)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 31, 2025
From: BAXTER INTERNATIONAL INC.
To: VANTIVE US HEALTHCARE LLC
Reel/Frame 074047/0246 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 31, 2025
From: BAXTER HEALTHCARE SA
To: VANTIVE HEALTH GMBH
Reel/Frame 074046/0489 →
SECURITY INTEREST Recorded Jan 31, 2025
From: VANTIVE US HEALTHCARE LLC; GAMBRO RENAL PRODUCTS, INC.
To: ARES CAPITAL CORPORATION
Reel/Frame 070076/0701 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 21, 2022
From: ORR, TROY J.
To: FRESENIUS MEDICAL CARE HOLDINGS, INC.
Reel/Frame 060581/0993 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 21, 2022
From: FRESENIUS MEDICAL CARE HOLDINGS, INC.
To: BAXTER INTERNATIONAL INC.; BAXTER HEALTHCARE SA
Reel/Frame 060582/0588 →
Continuity (7)
Continuation 16355170 · Mar 15, 2019
Continuation 14558021 · Dec 2, 2014
Continuation 13472099 · May 15, 2012
Continuation 11945177 · Nov 26, 2007
Continuation In Part 11484061 · Jul 11, 2006
Provisional Application 60699262 · Jul 13, 2005
Related Publication 20220299019A1 · Sep 22, 2022
References Cited (400)
US 862867A · Eggleston · 1907 [cited by applicant]
US 1946343A · Wicha · 1934 [cited by applicant]
US 2308974A · Ilarper · 1943 [cited by applicant]
US 2311229A · Herbert · 1943 [cited by applicant]
US 2356738A · Brugger · 1944 [cited by applicant]
US 2383193A · Herbert · 1945 [cited by applicant]
US 2529028A · Landon · 1950 [cited by applicant]
US 2658526A · Porter · 1953 [cited by applicant]
US 2711134A · Hughes · 1955 [cited by applicant]
US 2726019A · Moran · 1955 [cited by applicant]
US 2732807A · Parsegian · 1956 [cited by applicant]
US 2740259A · Westlund · 1956 [cited by applicant]
US 2755745A · Lewis · 1956 [cited by applicant]
US 2836121A · Browne · 1958 [cited by applicant]
US 2843050A · Harper · 1958 [cited by applicant]
US 2855144A · Andreasen · 1958 [cited by applicant]
US 2861596A · Ipsen · 1958 [cited by applicant]
US 2871795A · Smith · 1959 [cited by applicant]
US 2886281A · Canalizo · 1959 [cited by applicant]
US 2895653A · Giepen · 1959 [cited by applicant]
US 2920573A · Schuarte · 1960 [cited by applicant]
US 2980032A · Schneider · 1961 [cited by applicant]
US 3036526A · Llise · 1962 [cited by applicant]
US 3039399A · Everett · 1962 [cited by applicant]
US 3045601A · Rippingille · 1962 [cited by applicant]
US 3083943A · Stewart et al. · 1963 [cited by applicant]
US 3151783A · Shaw et al. · 1964 [cited by applicant]
US 3208721A · McHugh · 1965 [cited by applicant]
US 3216415A · Littleton · 1965 [cited by applicant]
US 3252623A · Corbin et al. · 1966 [cited by applicant]
US 3286577A · Weidner, Jr. · 1966 [cited by applicant]
US 3307481A · DeCoyeDeCastelet · 1967 [cited by applicant]
US 3310281A · Boteler · 1967 [cited by applicant]
US 3314371A · Hopkinson · 1967 [cited by applicant]
US 3318324A · Ruth · 1967 [cited by applicant]
US 3323786A · Boschi · 1967 [cited by applicant]
US 3379216A · Mercier · 1968 [cited by applicant]
US 3397216A · Welch et al. · 1968 [cited by applicant]
US 3491675A · Gold · 1970 [cited by applicant]
US 3508848A · Schmidlin · 1970 [cited by applicant]
US 3533387A · Kaneko · 1970 [cited by applicant]
US 3556465A · Little · 1971 [cited by applicant]
US 3645992A · Elston · 1972 [cited by applicant]
US 3652187A · Loeffler et al. · 1972 [cited by applicant]
US 3654953A · Hagdorn · 1972 [cited by applicant]
US 3655603A · Morton et al. · 1972 [cited by applicant]
US 3656873A · Schiff · 1972 [cited by applicant]
US 3661060A · Bowen · 1972 [cited by applicant]
US 3668978A · Bowen · 1972 [cited by applicant]
US 3685789A · Puster et al. · 1972 [cited by applicant]
US 3689025A · Kiser · 1972 [cited by applicant]
US 3693611A · Ploss · 1972 [cited by applicant]
US 3697197A · Berglund et al. · 1972 [cited by applicant]
US 3718552A · Mortell · 1973 [cited by applicant]
US 3727623A · Robbins · 1973 [cited by applicant]
US 3741687A · Nystoem · 1973 [cited by applicant]
US 3743245A · Demler, Sr. · 1973 [cited by applicant]
US 3776107A · Molus · 1973 [cited by applicant]
US 3785378A · Stewart · 1974 [cited by applicant]
US 3800794A · Georgi · 1974 [cited by applicant]
US 3807406A · Rafferty et al. · 1974 [cited by applicant]
US 3807906A · Breit · 1974 [cited by applicant]
US 3838946A · Schall · 1974 [cited by applicant]
US 3927955A · Spinosa et al. · 1975 [cited by applicant]
US 3955901A · Hamilton · 1976 [cited by applicant]
US 3966358A · Heimes et al. · 1976 [cited by applicant]
US 3985133A · Jenkins et al. · 1976 [cited by applicant]
US 3985135A · Carpenter et al. · 1976 [cited by applicant]
US 3995774A · Cooprider et al. · 1976 [cited by applicant]
US 4008710A · Chmiel · 1977 [cited by applicant]
US 4026669A · Leonard et al. · 1977 [cited by applicant]
US 4046610A · Lilja · 1977 [cited by applicant]
US 4047844A · Robinson · 1977 [cited by applicant]
US 4089342A · Stradella et al. · 1978 [cited by applicant]
US 4121236A · Wclp et al. · 1978 [cited by applicant]
US 4121584A · Turner et al. · 1978 [cited by applicant]
US 4123204A · Scholle · 1978 [cited by applicant]
US 4135496A · Chazov et al. · 1979 [cited by applicant]
US 4142523A · Stegeman · 1979 [cited by applicant]
US 4142524A · Jassawalla et al. · 1979 [cited by applicant]
US 4150922A · Cuenoud et al. · 1979 [cited by applicant]
US 4151184A · Smith · 1979 [cited by applicant]
US 4152098A · Moody et al. · 1979 [cited by applicant]
US 4158530A · Bernstein · 1979 [cited by applicant]
US 4162876A · Kolfertz · 1979 [cited by applicant]
US 4178940A · Au · 1979 [cited by applicant]
US 4181245A · Garrell et al. · 1980 [cited by applicant]
US 4185759A · Zissimopoulos · 1980 [cited by applicant]
US 4199307A · Jassawalla · 1980 [cited by applicant]
US 4204538A · Cannon · 1980 [cited by applicant]
US 4205238A · Shim et al. · 1980 [cited by applicant]
US 4214237A · Zissimopoulos · 1980 [cited by applicant]
US 4222127A · Donachy et al. · 1980 [cited by applicant]
US 4222813A · Jodrey · 1980 [cited by applicant]
US 4230844A · Chang et al. · 1980 [cited by applicant]
US 4236880A · Archibald · 1980 [cited by applicant]
US 4261356A · Turner et al. · 1981 [cited by applicant]
US 4262668A · Schmidt · 1981 [cited by applicant]
US 4262824A · Hrynewycz · 1981 [cited by applicant]
US 4264020A · Loiseau · 1981 [cited by applicant]
US 4265506A · Hollyday · 1981 [cited by applicant]
US 4265600A · Mandroian · 1981 [cited by applicant]
US 4265601A · Mandroian · 1981 [cited by applicant]
US 4266657A · Frost et al. · 1981 [cited by applicant]
US 4273121A · Jassawalla · 1981 [cited by applicant]
US 4276004A · Hahn et al. · 1981 [cited by applicant]
US 4277226A · Archibald · 1981 [cited by applicant]
US 4303376A · Siekmann · 1981 [cited by applicant]
US 4304260A · Turner et al. · 1981 [cited by applicant]
US 4308978A · Bayly et al. · 1982 [cited by applicant]
US 4321939A · Fenwick · 1982 [cited by applicant]
US 4322201A · Archibald · 1982 [cited by applicant]
US 4332254A · Lundquist · 1982 [cited by applicant]
US 4333452A · Au · 1982 [cited by applicant]
US 4364386A · Jenkins et al. · 1982 [cited by applicant]
US 4370983A · Lichtenstein · 1983 [cited by applicant]
US 4381180A · Sell · 1983 [cited by applicant]
US 4382753A · Archibald · 1983 [cited by applicant]
US 4410322A · Archibald · 1983 [cited by applicant]
US 4411603A · Kell · 1983 [cited by applicant]
US 4411651A · Schulman · 1983 [cited by applicant]
US 4412553A · Kopp et al. · 1983 [cited by applicant]
US 4421506A · Danby et al. · 1983 [cited by applicant]
US 4430048A · Fritsch · 1984 [cited by applicant]
US 4431019A · Kopp et al. · 1984 [cited by applicant]
US 4436620A · Bellotti et al. · 1984 [cited by applicant]
US 4439112A · Kitsnik · 1984 [cited by examiner]
US 4453931A · Pastrone · 1984 [cited by applicant]
US 4453932A · Pastrone · 1984 [cited by applicant]
US 4468177A · Strimling · 1984 [cited by applicant]
US 4468222A · Lundquist · 1984 [cited by examiner]
US 4479760A · Bilstad et al. · 1984 [cited by applicant]
US 4479761A · Bilstad et al. · 1984 [cited by applicant]
US 4479762A · Bilstad et al. · 1984 [cited by applicant]
US 4483665A · Hauser · 1984 [cited by applicant]
US 4490621A · Watabe et al. · 1984 [cited by applicant]
US 4493709A · Smith · 1985 [cited by applicant]
US 4496294A · Frikker · 1985 [cited by applicant]
US 4497760A · Sorlien · 1985 [cited by applicant]
US 4501300A · Murphy · 1985 [cited by applicant]
US 4511616A · Pitts et al. · 1985 [cited by applicant]
US 4514295A · Mathieu et al. · 1985 [cited by applicant]
US 4515017A · McConaghy · 1985 [cited by applicant]
US 4515792A · Watthey · 1985 [cited by applicant]
US 4519792A · Dawe · 1985 [cited by applicant]
US 4523598A · Weiss et al. · 1985 [cited by applicant]
US 4527411A · Shinosaki et al. · 1985 [cited by applicant]
US 4536201A · Brorsson et al. · 1985 [cited by applicant]
US 4538638A · Stack · 1985 [cited by applicant]
US 4542735A · Smith et al. · 1985 [cited by applicant]
US 4543044A · Simmons · 1985 [cited by applicant]
US 4550066A · Alexander et al. · 1985 [cited by applicant]
US 4550134A · Isogai et al. · 1985 [cited by applicant]
US 4552552A · Polaschegg et al. · 1985 [cited by applicant]
US 4553910A · Gosschalk · 1985 [cited by applicant]
US 4558715A · Walton et al. · 1985 [cited by applicant]
US 4559044A · Robinson et al. · 1985 [cited by applicant]
US 4569378A · Bergandy · 1986 [cited by applicant]
US 4573883A · Noon et al. · 1986 [cited by applicant]
US 4583920A · Lindner · 1986 [cited by applicant]
US 4586738A · Butler et al. · 1986 [cited by applicant]
US 4597412A · Stark · 1986 [cited by applicant]
US 4605396A · Tseo et al. · 1986 [cited by applicant]
US 4606374A · Kolenc et al. · 1986 [cited by applicant]
US 4611578A · Heimes · 1986 [cited by applicant]
US 4623328A · Hartranft · 1986 [cited by applicant]
US 4624625A · Schrenker · 1986 [cited by applicant]
US 4627419A · Hills · 1986 [cited by applicant]
US 4627837A · Gonzalo · 1986 [cited by applicant]
US 4628499A · Hammett · 1986 [cited by applicant]
US 4634430A · Polaschcgg · 1987 [cited by applicant]
US 4636149A · Brown · 1987 [cited by applicant]
US 4639245A · Pastrone et al. · 1987 [cited by applicant]
US 4643713A · Viitala · 1987 [cited by applicant]
US 4644897A · Fender · 1987 [cited by applicant]
US 4646781A · Mcintyre et al. · 1987 [cited by applicant]
US 4657490A · Abbott · 1987 [cited by applicant]
US 4662598A · Weingarten · 1987 [cited by applicant]
US 4662906A · Matkovich et al. · 1987 [cited by applicant]
US 4676467A · Palsulich · 1987 [cited by applicant]
US 4684106A · Kolenc et al. · 1987 [cited by applicant]
US 4690621A · Swain · 1987 [cited by applicant]
US 4703913A · Hunkapiller · 1987 [cited by applicant]
US 4705259A · Dolhen et al. · 1987 [cited by applicant]
US 4710166A · Thompson et al. · 1987 [cited by applicant]
US 4735558A · Kleinholz et al. · 1988 [cited by applicant]
US 4741678A · Nehring · 1988 [cited by applicant]
US 4746436A · Kopp et al. · 1988 [cited by applicant]
US 4755111A · Cocchi et al. · 1988 [cited by applicant]
US 4755228A · Sakurai et al. · 1988 [cited by applicant]
US 4758238A · Sundblom et al. · 1988 [cited by applicant]
US 4759264A · Danby et al. · 1988 [cited by applicant]
US 4763051A · Ruppert · 1988 [cited by applicant]
US 4768547A · Danby et al. · 1988 [cited by applicant]
US 4773218A · Wakita et al. · 1988 [cited by applicant]
US 4778451A · Kamen · 1988 [cited by applicant]
US 4781715A · Wurzel · 1988 [cited by applicant]
US 4787825A · Mantell · 1988 [cited by applicant]
US 4808161A · Kamen · 1989 [cited by applicant]
US 4817503A · Yamada · 1989 [cited by applicant]
US 4818186A · Pastrone et al. · 1989 [cited by applicant]
US 4818190A · Pelmulder et al. · 1989 [cited by applicant]
US 4821761A · Aid et al. · 1989 [cited by applicant]
US 4826482A · Kamen · 1989 [cited by applicant]
US 4830586A · Herter et al. · 1989 [cited by applicant]
US 4840542A · Abbott · 1989 [cited by applicant]
US 4842584A · Pastrone · 1989 [cited by applicant]
US 4846636A · Danby et al. · 1989 [cited by applicant]
US 4850817A · Nason et al. · 1989 [cited by applicant]
US 4850980A · Lentz et al. · 1989 [cited by applicant]
US 4854832A · Gardner et al. · 1989 [cited by applicant]
US 4856335A · Tornberg · 1989 [cited by applicant]
US 4856340A · Garrison · 1989 [cited by applicant]
US 4857048A · Simons et al. · 1989 [cited by applicant]
US 4858883A · Webster · 1989 [cited by applicant]
US 4869282A · Sittler et al. · 1989 [cited by applicant]
US 4872813A · Gorton et al. · 1989 [cited by applicant]
US 4882346A · Driscoll et al. · 1989 [cited by applicant]
US 4888011A · King et al. · 1989 [cited by applicant]
US 4894164A · Polaschegg · 1990 [cited by applicant]
US 4896215A · Morcom · 1990 [cited by applicant]
US 4900305A · Smith et al. · 1990 [cited by applicant]
US 4902282A · Bellotti et al. · 1990 [cited by applicant]
US 4906260A · Emheiser et al. · 1990 [cited by applicant]
US 4917348A · Phallen et al. · 1990 [cited by applicant]
US 4927411A · Pastrone et al. · 1990 [cited by applicant]
US 4928605A · Suwa et al. · 1990 [cited by applicant]
US 4935125A · Era et al. · 1990 [cited by applicant]
US 4938742A · Smits · 1990 [cited by applicant]
US 4944487A · Holtermann · 1990 [cited by applicant]
US 4950134A · Bailey et al. · 1990 [cited by applicant]
US 4969866A · Inagaki · 1990 [cited by applicant]
US 4974754A · Wirz · 1990 [cited by applicant]
US 4974774A · Nakagawa et al. · 1990 [cited by applicant]
US 4976162A · Kamen · 1990 [cited by applicant]
US 4981418A · Kingsford et al. · 1991 [cited by applicant]
US 4995864A · Bartholomew et al. · 1991 [cited by applicant]
US 4997464A · Kopf · 1991 [cited by applicant]
US 5002471A · Perlov · 1991 [cited by applicant]
US 5006050A · Cooke et al. · 1991 [cited by applicant]
US 5011368A · Frindel et al. · 1991 [cited by applicant]
US 5024644A · Bunch, III · 1991 [cited by applicant]
US 5036886A · Olsen et al. · 1991 [cited by applicant]
US 5038640A · Sullivan et al. · 1991 [cited by applicant]
US 5044901A · Fumero et al. · 1991 [cited by applicant]
US 5061236A · Sutherland et al. · 1991 [cited by applicant]
US 5062770A · Story et al. · 1991 [cited by applicant]
US 5062774A · Kramer et al. · 1991 [cited by applicant]
US 5088515A · Kamen · 1992 [cited by examiner]
US 5092377A · Krumberger · 1992 [cited by applicant]
US 5092414A · Blezard · 1992 [cited by applicant]
US 5095141A · Schammel et al. · 1992 [cited by applicant]
US 5098262A · Wecker et al. · 1992 [cited by applicant]
US 5100380A · Epstein et al. · 1992 [cited by applicant]
US 5100699A · Roeser · 1992 [cited by applicant]
US 5108367A · Epstein et al. · 1992 [cited by applicant]
US 5116021A · Faust et al. · 1992 [cited by applicant]
US 5116316A · Sertic et al. · 1992 [cited by applicant]
US 5145331A · Goes et al. · 1992 [cited by applicant]
US 5146713A · Grafius · 1992 [cited by applicant]
US 5151019A · Danby et al. · 1992 [cited by applicant]
US 5158210A · Du · 1992 [cited by applicant]
US 5158529A · Kanai · 1992 [cited by applicant]
US 5167387A · Ilartwich · 1992 [cited by applicant]
US 5167837A · Snodgrass et al. · 1992 [cited by applicant]
US 5171029A · Maxwell et al. · 1992 [cited by applicant]
US 5178182A · Kamen · 1993 [cited by applicant]
US 5193977A · Dame · 1993 [cited by applicant]
US 5193990A · Kamen et al. · 1993 [cited by applicant]
US 5201636A · Mikulski · 1993 [cited by applicant]
US 5211201A · Kamen et al. · 1993 [cited by applicant]
US 5213485A · Wilden · 1993 [cited by applicant]
US 5232434A · Inagaki et al. · 1993 [cited by applicant]
US 5241985A · Faust et al. · 1993 [cited by applicant]
US 5242384A · Robinson et al. · 1993 [cited by applicant]
US 5247434A · Peterson et al. · 1993 [cited by applicant]
US 5249932A · Van Bork · 1993 [cited by applicant]
US 5252041A · Schumack · 1993 [cited by applicant]
US 5252044A · Raines et al. · 1993 [cited by applicant]
US 5259352A · Gerhardy et al. · 1993 [cited by applicant]
US 5261798A · Budde · 1993 [cited by applicant]
US 5262068A · Browers et al. · 1993 [cited by applicant]
US 5269811A · Hayes et al. · 1993 [cited by applicant]
US 5279504A · Williams · 1994 [cited by applicant]
US 5279556A · Goi et al. · 1994 [cited by applicant]
US 5292384A · Klueh et al. · 1994 [cited by applicant]
US 5302093A · Owens et al. · 1994 [cited by applicant]
US 5304126A · Epstein et al. · 1994 [cited by applicant]
US 5324422A · Colleran et al. · 1994 [cited by applicant]
US 5330425A · Utterberg · 1994 [cited by applicant]
US 5332372A · Reynolds · 1994 [cited by applicant]
US 5342182A · Montoya et al. · 1994 [cited by applicant]
US 5344292A · Rabenau et al. · 1994 [cited by applicant]
US 5350357A · Kamen et al. · 1994 [cited by applicant]
US D351470S · Scherer et al. · 1994 [cited by applicant]
US 5353837A · Faust · 1994 [cited by applicant]
US 5368452A · Johnson et al. · 1994 [cited by applicant]
US 5378126A · Abrahamson et al. · 1995 [cited by applicant]
US 5387090A · Becker · 1995 [cited by examiner]
US 5391060A · Kozumplik et al. · 1995 [cited by applicant]
US 5395351A · Munsch · 1995 [cited by applicant]
US 5401963A · Sittler · 1995 [cited by applicant]
US 5413626A · Bartsch · 1995 [cited by applicant]
US 5415528A · Ogden et al. · 1995 [cited by applicant]
US 5421208A · Packard et al. · 1995 [cited by applicant]
US 5421823A · Kamen et al. · 1995 [cited by applicant]
US 5423738A · Robinson et al. · 1995 [cited by applicant]
US 5427509A · Chapman et al. · 1995 [cited by applicant]
US 5429485A · Dodge · 1995 [cited by applicant]
US 5431626A · Bryant et al. · 1995 [cited by applicant]
US 5431627A · Pastrone et al. · 1995 [cited by applicant]
US 5431634A · Brown · 1995 [cited by applicant]
US 5438510A · Bryant et al. · 1995 [cited by applicant]
US 5441392A · Lundback · 1995 [cited by applicant]
US 5441636A · Chevallet et al. · 1995 [cited by applicant]
US 5445506A · Afflerbaugh et al. · 1995 [cited by applicant]
US 5447286A · Kamen et al. · 1995 [cited by applicant]
US 5462416A · Dennehey et al. · 1995 [cited by applicant]
US 5462417A · Chapman · 1995 [cited by applicant]
US 5464352A · Van Emmerick · 1995 [cited by applicant]
US 5474683A · Bryant et al. · 1995 [cited by applicant]
US 5476368A · Rabenau et al. · 1995 [cited by applicant]
US 5476378A · Zagoroff et al. · 1995 [cited by applicant]
US 5478211A · Dominiak et al. · 1995 [cited by applicant]
US 5480294A · DiPerna et al. · 1996 [cited by applicant]
US 5482438A · Anderson et al. · 1996 [cited by applicant]
US 5482440A · Dennehey et al. · 1996 [cited by applicant]
US 5482446A · Williamson et al. · 1996 [cited by applicant]
US 5484239A · Chapman et al. · 1996 [cited by applicant]
US 5486286A · Peterson et al. · 1996 [cited by applicant]
US 5490765A · Bailey et al. · 1996 [cited by applicant]
US 5499906A · O'Leary · 1996 [cited by applicant]
US 5502096A · Kimura et al. · 1996 [cited by applicant]
US 5503538A · Wiernicki et al. · 1996 [cited by applicant]
US 5514069A · Brown et al. · 1996 [cited by applicant]
US 5520523A · Yorita et al. · 1996 [cited by applicant]
US 5522998A · Polaschegg · 1996 [cited by applicant]
US 5524865A · Uchisawa et al. · 1996 [cited by applicant]
US 5527161A · Bailey et al. · 1996 [cited by applicant]
US 5538405A · Patno et al. · 1996 [cited by applicant]
US 5540568A · Rosen et al. · 1996 [cited by applicant]
US 5547453A · DiPerna · 1996 [cited by applicant]
US 5551850A · Williamson et al. · 1996 [cited by applicant]
US 5551941A · Howell · 1996 [cited by applicant]
US 5551942A · Brown et al. · 1996 [cited by applicant]
US 5554011A · Bales et al. · 1996 [cited by applicant]
US 5554013A · Owens et al. · 1996 [cited by applicant]
US 5554108A · Browning et al. · 1996 [cited by applicant]
US 5558506A · Simmons et al. · 1996 [cited by applicant]
US 5567118A · Grgurich et al. · 1996 [cited by applicant]
US 5570716A · Kamen et al. · 1996 [cited by applicant]
US 5573385A · Chevallier · 1996 [cited by applicant]
US 5578070A · Utterberg · 1996 [cited by applicant]
US 5588816A · Abbott · 1996 [cited by examiner]
US 5593290A · Greisch · 1997 [cited by examiner]
US 5601420A · Warner et al. · 1997 [cited by applicant]
US 5609572A · Lang · 1997 [cited by applicant]
US 5614677A · Wamsiedler et al. · 1997 [cited by applicant]
US 5624409A · Seale · 1997 [cited by applicant]
US 5628908A · Kamen et al. · 1997 [cited by applicant]
US 5630710A · Tune et al. · 1997 [cited by applicant]
US 5634896A · Bryant et al. · 1997 [cited by applicant]
US 5640995A · Packard et al. · 1997 [cited by applicant]
US 5641405A · Keshaviah et al. · 1997 [cited by applicant]
US 5641892A · Larkins et al. · 1997 [cited by applicant]
US 5643205A · Utterberg · 1997 [cited by applicant]
US 5645531A · Thompson et al. · 1997 [cited by applicant]
US 5647733A · Augustyn et al. · 1997 [cited by applicant]
US 5653251A · Handler · 1997 [cited by applicant]
US 5656032A · Kriesel · 1997 [cited by applicant]
US 5658133A · Anderson et al. · 1997 [cited by applicant]
US 5660722A · Nederlof · 1997 [cited by applicant]
US 5667368A · Augustyn et al. · 1997 [cited by applicant]
US 5669724A · Kato · 1997 [cited by applicant]
US 5669764A · Behringer et al. · 1997 [cited by applicant]
US 5687633A · Eady · 1997 [cited by applicant]
US 5690602A · Brown et al. · 1997 [cited by applicant]
US 5709534A · O'Leary · 1998 [cited by applicant]
US D390654S · Alsberg et al. · 1998 [cited by applicant]
US 5713865A · Manning et al. · 1998 [cited by applicant]
US 5713888A · Neuenfeldt et al. · 1998 [cited by applicant]
US 5718565A · Kuhn et al. · 1998 [cited by applicant]
US 5718567A · Rapp et al. · 1998 [cited by applicant]
US 5725363A · Bustgens et al. · 1998 [cited by applicant]
US 5741121A · O'Leary · 1998 [cited by applicant]
US 5741125A · Neftel et al. · 1998 [cited by applicant]
US 5743170A · Pascual et al. · 1998 [cited by applicant]
US 5746708A · Giesler et al. · 1998 [cited by applicant]
US 5755683A · Houle et al. · 1998 [cited by applicant]
US 5764034A · Bowman et al. · 1998 [cited by applicant]
US 5769387A · Perez · 1998 [cited by applicant]
US 5771914A · Ling et al. · 1998 [cited by applicant]
US 5772635A · Dastur et al. · 1998 [cited by applicant]
US 5772637A · Heinzmann et al. · 1998 [cited by applicant]
US 5775371A · Pan et al. · 1998 [cited by applicant]
US 5782575A · Vincent et al. · 1998 [cited by applicant]
US 5782805A · Meinzer et al. · 1998 [cited by applicant]
US 5788215A · Ryan · 1998 [cited by applicant]
US 5799207A · Wang et al. · 1998 [cited by applicant]
US 5816775A · Imai et al. · 1998 [cited by applicant]