US5018945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accurate peristaltic pump
Assignee: Baxter International Inc
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Filing: 1989-12-14
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Granted: 1991-05-28
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Expires: 2009-12-14
Abstract
Abstract A method and device are provided for infusing a fluid into a patient via a tubing. A peristaltic pumping apparatus is provided which applies a pumping action to the tubing. A linear variable differential transformer measures the diameter of the tubing subject to the pumping action. The diameter of the tubing is measured at various times and changes in the diameter of the tubing are utilized to adjust the pumping action on the tubing.
Inventors
- 👤 Edmund D. D'Silva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14212; A61M5/14228; F; F04; F04B; F04B43/00; F04B43/08; F04B43/082; A61M2205/00; A61M2205/60; A61M2205/6036
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
94 words
A method for infusing a fluid from a source of fluid to a patient through tubing comprising: (1) applying external pumping action to the tubing; (2) measuring a diameter of the tubing subject to the pumping action after passage of a period of time; (3) comparing the diameter of the tubing after the passage of a period of time with a previous diameter of the tubing; and (4) adjusting the rate of the pumping action to compensate for any change in diameter of the tubing to maintain an approximately constant flow rate of infusion.
Claim 2
Independent Claim
94 words
A method for infusing a fluid from a source of fluid to a patient through tubing comprising: (1) applying external pumping action to the tubing; (2) measuring a diameter of the tubing subject to the pumping action after passage of a period of time; (3) comparing the diameter of the tubing after the passage of a period of time with a previous diameter of the tubing; and (4) adjusting the rate of the pumping action to compensate for any change in diameter of the tubing to maintain an approximately constant flow rate of infusion.
Claim 3
Dependent Claim
20 words
The method of claim 1 further including repeating steps (2), (3) and (4) for a multiplicity of periods of time.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the external diameter of the tubing is measured.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the pumping action is peristaltic.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein the adjustment to the rate of pumping action is further made as a function of the time of infusion and the rate of infusion.
Claim 7
Dependent Claim
60 words
The method of claim 5 wherein the adjustment to the rate of pumping action is made in accordance with the formula: A/100=-9.7-0.0844(T)+12.3(ΔD)+0.0322(R) where A is the percent adjustment in the motor speed, T is the time of infusion in hours, ΔD is the change in tube diameter in inches, and R is the rate of infusion in millimeters per hour.
Claim 8
Independent Claim
106 words
A device for infusing fluid from a source of fluid through tubing to a patient comprising: means for applying a pumping action on the exterior of the tubing to provide fluid propulsion; means for measuring the diameter of the tubing subject to the pumping means; means for storing a plurality of diameter measurements of the tubing; means for comparing the diameter measurements of the tubing to determine changes in the tubing diameter; and means for adjusting the rate of the pumping action on the exterior of the tubing to compensate for any change in the tubing diameter to maintain an approximately constant flow rate of infusion.
Claim 9
Independent Claim
106 words
A device for infusing fluid from a source of fluid through tubing to a patient comprising: means for applying a pumping action on the exterior of the tubing to provide fluid propulsion; means for measuring the diameter of the tubing subject to the pumping means; means for storing a plurality of diameter measurements of the tubing; means for comparing the diameter measurements of the tubing to determine changes in the tubing diameter; and means for adjusting the rate of the pumping action on the exterior of the tubing to compensate for any change in the tubing diameter to maintain an approximately constant flow rate of infusion.
Claim 10
Dependent Claim
17 words
The device of claim 7 wherein the means for applying a pumping action is a peristaltic pump.
Claim 11
Dependent Claim
21 words
The device of claim 7 wherein the means for measuring the diameter of the tubing is a linear variable differential transformer.
Claim 12
Dependent Claim
17 words
The device of claim 7 wherein the means for storing and means for comparing is a microprocessor.
Claim 13
Dependent Claim
20 words
The device of claim 7 wherein the means for adjusting includes means for changing the speed of the pumping means.
Claim 14
Dependent Claim
122 words
A pump for infusing fluid into a patient via a tube comprising: a peristaltic pumping apparatus applied externally to the tube; a driving motor for driving the peristaltic pumping apparatus at a speed; a pressure plate provided juxtaposed to the peristaltic pumping apparatus, the tubing being secured between the pressure plate and the peristaltic pumping apparatus; means provided in the pressure plate for measuring the diameter of the tubing to which the peristaltic pumping apparatus is applied; and means for comparing the measurements of the tubing diameter to determine changes in diameter of the tubing; and means for regulating the speed of the driving motor to compensate for any change in tubing diameter to maintain an approximately constant flow rate of infusion.
Claim 15
Dependent Claim
122 words
A pump for infusing fluid into a patient via a tube comprising: a peristaltic pumping apparatus applied externally to the tube; a driving motor for driving the peristaltic pumping apparatus at a speed; a pressure plate provided juxtaposed to the peristaltic pumping apparatus, the tubing being secured between the pressure plate and the peristaltic pumping apparatus; means provided in the pressure plate for measuring the diameter of the tubing to which the peristaltic pumping apparatus is applied; and means for comparing the measurements of the tubing diameter to determine changes in diameter of the tubing; and means for regulating the speed of the driving motor to compensate for any change in tubing diameter to maintain an approximately constant flow rate of infusion.
Claim 16
Dependent Claim
12 words
The pump of claim 12 wherein the comparing means is a microprocessor.
Claim 17
Dependent Claim
12 words
The pump of claim 12 wherein the regulating means is a microprocessor.
Claim 18
Dependent Claim
31 words
The pump of claim 12 wherein the peristaltic pumping apparatus includes an array of cams secured to the driving motor, the array of cams driving a plurality of cooperating pressure fingers.
Claim 19
Dependent Claim
16 words
The pump of claim 12 wherein the means for measuring is a linear variable differential transformer.
References Cited (Backward Citations)
US3582234A
Cited
US4299541A
Cited
US4299218A
Cited
US4210138A
Cited
US4217993A
Cited
US4231707A
Cited
US4205238A
Cited
US4213345A
Cited
US4233549A
Cited
US4227420A
Cited
US4254460A
Cited
US4373525A
Cited
US4394862A
Cited
US4346705A
Cited
US4488700A
Cited
US4604034A
Cited
US4554492A
Cited
US4702675A
Cited
US4604166A
Cited
US4692145A
Cited
US4715786A
Cited
US4731057A
Cited
US4785799A
Cited
US4617014A
Cited
US4690673A
Cited
US4648869A
Cited
US4725205A
Cited
US4846792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |