公开(公告)号：CA2047231A1

公开(公告)日：1991-07-12

申请号：CA2047231

申请日：1990-11-28

Applicant: BAXTER INT

Inventor： MATTHEWS JOSEPH B ,  BOWMAN GEORGE A

IPC: F04B49/06 ,  A61M1/00 ,  F04B43/09 ,  F04B43/12 ,  G02B26/04 ,  G01P3/40 ,  A61M5/168 ,  G02B26/00

Abstract: An encoder wheel (60) is provided for monitoring a peristaltic pump (20). Th e encoder wheel (60) provides a plurality of equispaced sectors (62) and a reference sector (66) provided at the outer radius of the encoder wheel (60). A vane slit (68) is pro- vided radially offset from the sectors (62, 66). A pair of optical couplers (72, 74) are provided to read the sectors (62, 66) and the vane slit (68).

公开(公告)号：CA2047230A1

公开(公告)日：1991-07-12

申请号：CA2047230

申请日：1990-11-28

Applicant: BAXTER INT

Inventor： MATTHEWS JOSEPH B ,  BOWMAN GEORGE A

IPC: A61M1/00 ,  A61M5/142 ,  F04B49/06 ,  H02P8/14 ,  H02P8/16 ,  G05B19/40 ,  H02P8/00

Abstract: The present invention provides a drive signal for a peristaltic pump motor. A first circuit is provided which generates a first series of pulses at a given frequency. A second circuit is provided which generates a second series of pulses having a frequency higher than the frequency of the first series of pulses. A third circuit is provided which generates a third series of pulses having a frequency between the frequency of the first and second series of pulses. Finally, a circuit is provided which combines the three series of pulses into a drive signal. The drive signal length is determined by the frequency of the first series of pulses. The drive signal further is divided into two sections, an initial pulse stage determined by the frequency of the third series of pulses, and a modulated pulse stage being a series of pulses determined by the frequency of the second series of pulses.