Syringe pump bearing mechanism
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United States of America Patent
Stats
-
Jun 19, 2007
Grant Date -
Nov 4, 2004
app pub date -
Apr 29, 2003
filing date -
Apr 29, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lead screw mounting system for a syringe pump in which a second end of a lead screw is located within a connection tube that connects a drive device engaged with the lead screw to a plunger drive head. A bearing mount having diverging bearing surfaces is formed at the second end of the lead screw and a bearing having a complementary inner shape is mounted to the bearing mount. The bearing is larger than the inner diameter of the connection tube and is in constant contact with the tube. During operation, the bearing tends to move up one or the other of the diverging bearing surfaces of the bearing mount depending on which direction the connection tube is moving over the bearing creating a wedge action. The bearing functions to keep the lead screw concentrically located within the connection tube thereby increasing flow uniformity of the syringe pump.
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