Patent US4857048A successfully refreshed from Google Patents.
US4857048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
IV pump and disposable flow chamber with flow control
Assignee: Agilent Technologies Inc
•
Filing: 1988-03-21
•
Granted: 1989-08-15
•
Expires: 2008-03-21
Abstract
Abstract An apparatus and method are disclosed for an IV pump which can act also as a passive infusion controller. The apparatus has a disposable flow chamber with two pumping subchambers connected by a first collapsible passageway. A pump drive is used to operate the pumping subchambers and includes a first control valve for depressing the first collapsible passageway to control flow between the subchambers and an outlet control valve for depressing an outlet collapsible passageway to control flow of infusate out of the flow chamber. The flow chamber has a base surface and first and second caps, each cap being spaced apart from the base surface and having means for attachment to one of two moveable connector rods. The caps each act as one side of the first and second pumping subchambers, respectively, the base surface being the other side. A flexible wall is connected to the base surface and to each of the caps providing the subchamber volumes therebetween. The flexible wall is constructed of a material having a thickness and modulus of elasticity such that when the connector rods are not moving the flexible wall element does not collapse when subjected to a negative gauge pressure.
Inventors
- 👤 Tad D. Simons
- 👤 Frederick A. Stawitcke
- 👤 William M. Reed
- 👤 Paul A. Tessier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:47
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14212; A61M5/14224; F; F04; F04B; F04B43/00; F04B43/02; F04B43/021
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A method of calibrating an infusion system to achieve a given flow rate for infusing fluids into patients comprising the steps of: connecting a drip chamber, which is adapted to receive an infusate, to a volumetric pump; pumping said volumetric pump for a first time period at a rate to achieve said given flow rate; counting the number of drops per unit time through said drip chamber during said pumping step to arrive at a drip rate corresponding to said given flow rate in order to calibrate the drop size; stopping said pumping; and while said pumping is stopped, adjusting said drip rate to be equal to the number of drops counted per unit time to achieve said given flow rate for a passive infusion.
Claim 2
Independent Claim
125 words
A method of calibrating an infusion system to achieve a given flow rate for infusing fluids into patients comprising the steps of: connecting a drip chamber, which is adapted to receive an infusate, to a volumetric pump; pumping said volumetric pump for a first time period at a rate to achieve said given flow rate; counting the number of drops per unit time through said drip chamber during said pumping step to arrive at a drip rate corresponding to said given flow rate in order to calibrate the drop size; stopping said pumping; and while said pumping is stopped, adjusting said drip rate to be equal to the number of drops counted per unit time to achieve said given flow rate for a passive infusion.
Claim 3
Independent Claim
102 words
A method of infusing fluids into patients at a given flow rate comprising the steps of: connecting a source of said fluid through a drip chamber to a volumetric pump; pumping said volumetric pump at a rate to achieve said given flow rate; counting the number of drops per unit time during said pumping step to arrive at a drip rate corresponding to said given flow rate; stopping said pumping; and while said pumping is stopped, adjusting said drip rate to be equal to the number of drops counted per unit time to achieve said given flow rate for a passive infusion.
Claim 4
Independent Claim
102 words
A method of infusing fluids into patients at a given flow rate comprising the steps of: connecting a source of said fluid through a drip chamber to a volumetric pump; pumping said volumetric pump at a rate to achieve said given flow rate; counting the number of drops per unit time during said pumping step to arrive at a drip rate corresponding to said given flow rate; stopping said pumping; and while said pumping is stopped, adjusting said drip rate to be equal to the number of drops counted per unit time to achieve said given flow rate for a passive infusion.
Claim 5
Dependent Claim
94 words
The method of claim 2 further comprising the steps of: interrupting said passive infusion; pumping said volumetric pump during said interruption for a second time period at a rate to achieve said given flow rate; counting the number of drops per unit time during said second time period to arrive at a drip rate corresponding to said given flow rate; stopping said pumping; and while said pumping is stopped, adjusting said drip rate to be equal to the number of drops counted per unit time to achieve said flow rate for a passive infusion.
References Cited (Backward Citations)
US2703084A
Cited
US2849026A
Cited
US2925814A
Cited
US3091239A
Cited
US3199511A
Cited
US3198385A
Cited
US3314594A
Cited
US3227092A
Cited
US3339464A
Cited
US3335724A
Cited
US3428042A
Cited
US3295458A
Cited
US3384080A
Cited
US3372624A
Cited
US3359910A
Cited
US3391644A
Cited
US3451393A
Cited
US3500366A
Cited
US3464359A
Cited
US3596515A
Cited
US3559644A
Cited
US3488763A
Cited
US3563090A
Cited
US3648694A
Cited
US3640277A
Cited
US3670926A
Cited
US3640276A
Cited
US3690318A
Cited
US3731679A
Cited
US3737251A
Cited
US3895741A
Cited
US3769879A
Cited
US3809507A
Cited
US3934480A
Cited
US3894538A
Cited
US3990444A
Cited
US3874826A
Cited
US3993069A
Cited
US3886938A
Cited
US3895631A
Cited
US3901231A
Cited
US3884228A
Cited
US3923060A
Cited
US3985133A
Cited
US4037598A
Cited
US3993061A
Cited
US3994294A
Cited
US3969991A
Cited
US4029094A
Cited
DE2512942A1
Cited
US3963024A
Cited
US3993065A
Cited
US3990443A
Cited
US4137940A
Cited
US4018362A
Cited
US4030495A
Cited
US4048474A
Cited
US4039269A
Cited
US4105028A
Cited
US4191184A
Cited
US4181130A
Cited
US4286590A
Cited
US4335835A
Cited
US4237881A
Cited
US4410322A
Cited
US4322201A
Cited
US4236880A
Cited
US4277226A
Cited
US4382753A
Cited
US4303376A
Cited
US4314484A
Cited
US4346606A
Cited
US4383252A
Cited
US4364386A
Cited
US4375813A
Cited
US4389886A
Cited
US4384578A
Cited
US4430078A
Cited
US4380235A
Cited
US4509943A
Cited
FR2514834A1
Cited
US4670007A
Cited
US4525163A
Cited
US4583975A
Cited
US4557725A
Cited
US4617014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |