11. Heparin Delivery
11.2 PHYSICAL DESCRIPTION
The heparin pump is an electromechanical syringe pump, which
consists of the following elements:
11.2.1 Arm and Arm Shaft
The arm is used to hold the syringe in place from the outside so
that the syringe body cannot slide or rotate. The arm shaft signals
the arm’s engage or disengage position by blocking or unblocking
the light path of an optical sensor located on the heparin pump
assembly (see Figures 11-1 through 11-3).
11.2.2 Slide Assembly
The slide assembly consists of the gear rack, which meshes with
the motor gears, and the custom plunger foot for a 10/20 or 20/30
mL syringe. This assembly will push the syringe plunger up to
deliver the heparin (see Figures 11-1 and 11-2).
Figure 11-1. External Elements Of The Heparin Pump Assembly
11.2.3 Engage/Disengage Optical Sensor
The arm shaft actuates the engage/disengage optical sensor. When
the arm is in the engage position (horizontal), the arm shaft blocks
the light reaching the light detector, thereby signaling the
engagement. The opposite will happen when the arm is
disengaged (vertical). See Figures 11-1 through 11-3. The shaft
spring provides the force for the arm to close and hold the syringe
body in place.
157-1278-918 Rev A 11-5
April 2004
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