Syringe pump bearing mechanism

Details Syringe pump bearing mechanism Syringe pump bearing mechanism

2007-06-19

2007-06-19

Lucchesi, Nicholas D. (Department: 3767)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C128SDIG010

Reexamination Certificate

active

10425576

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.

REFERENCES:
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patent: 6428509 (2002-08-01), Fielder
patent: 6645177 (2003-11-01), Shearn
patent: 6958053 (2005-10-01), Reilly
patent: 2003/0233069 (2003-12-01), Gillespie, Jr.
patent: 2 224 444 (1990-05-01), None

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