Title:
【発明の名称】カセット型静脈ポンプの弁間の差圧を補償する方法
Document Type and Number:
Japanese Patent JP2003516820
Kind Code:
A
Abstract:
A pump used to infuse a fluid into a patient is controlled in accordance with an algorithm that enables a microprocessor (17) to monitor and adjust each pump cycle to compensate for a differential pressure between the pump's inlet and outlet. The algorithm defines a fluid delivery protocol that is applied in controlling the operation of the pump to achieve a desired rate, volume, and timing of the fluid infusion. Fluid is delivered by the pump when a plunger (42) compresses an elastomeric membrane (29) overlying a fluid chamber (30). Due to the small volume of the chamber, an incremental change in the plunger position before the delivery stroke produces a significant change in the delivery pressure. At the beginning of a pump cycle, the microprocessor determines the differential pressure between the inlet and outlet of the pump, and adjusts the plunger position before the delivery stroke to compensate for the differential pressure. A retraction of the plunger from the home position decreases the delivery pressure of the fluid, and an advancement of the plunger increases it. After the position of the plunger is adjusted to compensate for the differential pressure, the pump cycle proceeds. Following the plunger stroke, the outlet pressure is used to determine the actual volume of fluid delivered. The duration of the plunger stroke in the next pump cycle is adjusted to compensate for any volume delivery error produced by the differential pressure compensation.
More Like This:
Inventors:
Horst, Peter A
Kraji Yusky, David A
Mask, Rudolph Theei
Kraji Yusky, David A
Mask, Rudolph Theei
Application Number:
JP2001544933A
Publication Date:
May 20, 2003
Filing Date:
December 15, 2000
Export Citation:
Assignee:
ABBOTT LABORATORIES
International Classes:
F04B49/08; A61M5/00; A61M5/142; A61M5/168; A61M5/172; F04B13/00; F04B49/00; F04B49/06; G01P21/00; G05D16/20; (IPC1-7): A61M5/00; A61M5/142; F04B13/00; F04B49/08
Domestic Patent References:
| JPS645558A | 1989-01-10 | |||
| JPH05280470A | 1993-10-26 | |||
| JPS61257661A | 1986-11-15 |
Foreign References:
| US5292306A | 1994-03-08 | |||
| US5554115A | 1996-09-10 |
Attorney, Agent or Firm:
Yoshio Kawaguchi (4 outside)