Fluid pump for a flexible, variable geometry reservoir
First Claim
1. An infusion pump for delivering a controlled rate of an intravenous fluid from a reservoir to a patient, the infusion pump comprising:
- a flexible, variable geometry reservoir containing intravenous fluid and having an outlet to allow the exit of fluid therefrom when the volume V of the reservoir is reduced;
a chamber containing the reservoir and having initial volume greater than the reservoir, the chamber having volume σ
which can be reduced;
means for reducing the chamber volume incrementally by dσ and
the volume of the reservoir therein incrementally by dV which is associated with dσ
at specific chamber volume σ
; and
programmable controller having a memory, the controller communicating with the chamber volume reducing means to control the rate of reduction of the chamber volume, wherein the controller, upon actuation, reduces the chamber volume according to the formula
space="preserve" listing-type="equation">dσ
=dV·
S.sub.σ
where S.sub.σ
is the previously determined relationship of reservoir volume reduction to chamber volume reduction at chamber volume σ
, and wherein the controller controls dσ
by determinations from values of dV and S.sub.σ
contained in the controller memory.
3 Assignments
0 Petitions
Accused Products
Abstract
A positive displacement infusion pump for delivery of intravenous fluid at a predetermined rate from a standard, flexible intravenous bag to a patient. The pump includes a bag chamber with a moveable side opposing a stationary side. The bag chamber has a volume which is greater that of the bag so the bag may be easily inserted into the chamber. The moveable side is controlled such that adjustments are made to the reduction of the chamber volume and/or rate of reduction of the chamber volume to precisely control the fluid flow out of the bag in accordance with information in the computer memory.
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Citations
22 Claims
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1. An infusion pump for delivering a controlled rate of an intravenous fluid from a reservoir to a patient, the infusion pump comprising:
-
a flexible, variable geometry reservoir containing intravenous fluid and having an outlet to allow the exit of fluid therefrom when the volume V of the reservoir is reduced; a chamber containing the reservoir and having initial volume greater than the reservoir, the chamber having volume σ
which can be reduced;means for reducing the chamber volume incrementally by dσ and
the volume of the reservoir therein incrementally by dV which is associated with dσ
at specific chamber volume σ
; andprogrammable controller having a memory, the controller communicating with the chamber volume reducing means to control the rate of reduction of the chamber volume, wherein the controller, upon actuation, reduces the chamber volume according to the formula
space="preserve" listing-type="equation">dσ
=dV·
S.sub.σwhere S.sub.σ
is the previously determined relationship of reservoir volume reduction to chamber volume reduction at chamber volume σ
, and wherein the controller controls dσ
by determinations from values of dV and S.sub.σ
contained in the controller memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An infusion pump for delivering a controlled rate of an intravenous fluid from a reservoir to a patient, the infusion pump comprising:
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a flexible, variable geometry reservoir containing intravenous fluid and having an outlet to allow exit of fluid therefrom when the volume V of the reservoir is reduced; a chamber containing the reservoir and having initial volume greater than the reservoir, the chamber having volume σ
which can be reduced;means for reducing the chamber volume incrementally by dσ and
the volume of the reservoir therein;a programmable controller having a memory, the controller communicating with the chamber volume reducing means to control the rate of reduction of the chamber volume, wherein the controller, upon actuation, reduces the chamber volume at a rate ##EQU12## where Ri is the incremental rate of intravenous fluid delivered to the patient associated with incremental chamber volume reduction dσ and
the time interval dt, and SR is the previously determined relationship of rate of chamber volume reduction to rate of fluid flow Ri at chamber volume σ
, and wherein the controller controls rate dσ
/dt by determinations from values of Ri and SR contained in the controller memory. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification