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Title:
AMBULATORY INFUSION PUMP
Document Type and Number:
WIPO Patent Application WO1995024229
Kind Code:
A3
Abstract:
A medical infusion pump (10) including an improved electric motor assembly (256). The medical infusion pump (10) includes a pumping mechanism (250) and a pump chamber (132) in an operative position with respect to the pumping mechanism (250), the pumping mechanism (250) manipulating the pump chamber (132) to pump liquid through the pump chamber. An electric motor (256) having a rotatable drive shaft (316) is operably linked to the pump driving mechanism (250) and the pump driving mechanism (250) pumps a select amount of liquid through the pump chamber (132) on each rotation of the electric motor drive shaft (316). The improved electric motor assembly (256) includes a motor having a portion of a drive shaft (388) extending therefrom. A magnet (392) is attached to the extending portion of the drive shaft for rotation with the drive shaft. A flux gatherer (396) is spaced from and magnetically coupled to the magnet (392) for biasing the poles of the magnet in a select orientation relative to the flux gatherer (396) so as to stop the pump driving mechanism (250) in a select position. A magnetic position detector (400) is spaced from and magnetically coupled to the magnet (392) for emitting an electrical signal each rotation of the drive shaft (388).

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Inventors:
ANDERSON ROBERT L
CASTLEBERRY JEFFREY P
STRACENER STEVE W
Application Number:
PCT/US1995/002545
Publication Date:
October 26, 1995
Filing Date:
March 02, 1995
Export Citation:
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Assignee:
BAXTER INT (US)
International Classes:
A61M5/00; A61M5/142; A61M5/152; A61M5/168; A61M39/28; H02P3/08; A61M5/14; (IPC1-7): A61M/
Foreign References:
US4725205A1988-02-16
US4869646A1989-09-26
US4653987A1987-03-31
US5286176A1994-02-15
US5039279A1991-08-13
US5131816A1992-07-21
US2105200A1938-01-11
US3778195A1973-12-11
US4236880A1980-12-02
US4255088A1981-03-10
US4273121A1981-06-16
US4474309A1984-10-02
US4479797A1984-10-30
US4565542A1986-01-21
US4585442A1986-04-29
US4650469A1987-03-17
US4657490A1987-04-14
US4696671A1987-09-29
US4927411A1990-05-22
US5006050A1991-04-09
US5017059A1991-05-21
US5116203A1992-05-26
Other References:
See also references of EP 0697898A4
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