| 摘要 |
<p>The pump unit comprises a housing (1) having a roller head (22) releasably fastened to the top (21) of the housing (1) and an arcuate tube retainer (26) for urging the pump tube (25) into engagement with the head (22). The retainer (26) is pivotally mounted on the housing (1) so as to be swingable between open and closed positions to permit changing of the pump tube (25) and is lockable in its closed position by a manually operated latch (81). The head (22) is rotated by a variable speed drive mechanism, including DC printed circuit motor (100) disposed within the housing (1). The retainer (26) has a removable arcuate liner (87) for engaging and urging a pump tube (25) of predetermined diameter into correct operative engagement with the head (22) and this liner (87) is readily interchangeable with other liners (87) which permit pump tubes (25) of different predetermined diameters to be used with the head (22). Also, the head (22) is interchangeable with another paediatric head (22) having a reduction gear mechanism (62) or providing a different speed ratio.</p> |
