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Syringe pump bearing mechanism

  • US 7,232,424 B2
  • Filed: 04/29/2003
  • Issued: 06/19/2007
  • Est. Priority Date: 04/29/2003
  • Status: Active Grant
First Claim
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1. A syringe pump having a lead screw with a drive device in threaded engagement with the lead screw, the drive device moving along the lead screw in response to rotation of the lead screw, and a drive head adapted to drive a syringe plunger into the barrel of a syringe to expel fluid contents of the syringe, the syringe pump comprising:

  • a lead screw having a first end and a second end with the first end mounted to a frame, the second end of the lead screw comprises a bearing mount having outwardly diverging bearing surfaces;

    a connection tube located over the lead screw and connected between the drive device and the drive head to communicate movement of the drive device along the lead screw to the drive head, the connection tube having a hollow portion with an inner surface;

    wherein the second end of the lead screw is located within the hollow portion of the connection tube but is otherwise unmounted; and

    a bearing located at the bearing mount in contact with the inner surface of the hollow portion of the connection tube thereby creating a guided cantilever mount of the second end of the lead screw within the connection tube.

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