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Syringe pump

  • US 6,500,151 B1
  • Filed: 03/29/2000
  • Issued: 12/31/2002
  • Est. Priority Date: 04/28/1999
  • Status: Expired due to Term
First Claim
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1. A syringe pump comprising:

  • a mechanism for engaging and driving a plunger of a syringe; and

    a sensor mechanism for sensing a size of a barrel of the syringe, said sensor mechanism comprising;

    a contact member displaceable into contact with said barrel, a mask member, having at least a first side, coupled with said contact member and movable in response to movement of said contact member, and a row of a plurality of optical sensors positioned to receive radiation transmitted by the mask member, wherein the mask member includes a plurality of transmitting regions arranged in a row, each transmitting region having a different length, and wherein the pump includes a control unit responsive to at least one output from said sensors, said control unit determining the size of the barrel from a combination of a length of the row of sensors receiving radiation transmitted by one of the transmitting regions and a position of an edge of the transmitting region.

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