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Delivery apparatus with pressure controlled delivery

  • US 5,354,273 A
  • Filed: 12/14/1992
  • Issued: 10/11/1994
  • Est. Priority Date: 12/14/1992
  • Status: Expired due to Term
First Claim
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1. A delivery apparatus for delivering a stored medium from a variable volume delivery device in which mechanical actuating means are provided for expelling the stored medium from the delivery device through a delivery tip at one end thereof, said delivery apparatus comprising:

  • fixture means for receiving and positioning said delivery device;

    said fixture means including force generating and application means for applying an actuating force to said mechanical actuating means of said delivery device to subject the stored medium in said variable volume chamber to a pressure for the expulsion of said medium from said chamber through said delivery tip;

    said fixture means further including an opening therein for receiving said delivery tip and positioning the same for connection to a use application;

    pressure sensing means for sensing and generating a signal proportional to the magnitude of the pressure in said medium resulting from the force applied by said force generating and application means;

    reference pressure generating means for generating a reference pressure signal representing a preselected desired reference pressure magnitude for the pressure in said medium resulting from the actuating force applied by said applicator means;

    comparator means for comparing the signal generated by said pressure sensing means with said reference pressure signal and for generating a difference signal proportional to the difference between the signal generated by said pressure sensing means and said reference pressure signal;

    control means for controlling the magnitude of the force applied by said applicator means; and

    means connecting said difference signal to said control means for controlling the magnitude of the force applied by said applicator means in a direction to reduce the magnitude of said difference signal to zero, whereby said applied force is automatically regulated to maintain a pressure in said medium at the level represented by said reference pressure signal.

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