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Self adjustable exit port

  • US 6,217,906 B1
  • Filed: 09/17/1999
  • Issued: 04/17/2001
  • Est. Priority Date: 03/24/1997
  • Status: Expired due to Term
First Claim
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1. A method of forming a delivery device comprising the steps of:

  • filling a chamber of the delivery device with a beneficial agent having a known viscosity;

    providing an exit passage through which the beneficial agent is delivered, the exit passage comprising a first portion having a wall which is at an angle to a direction of flow of the beneficial agent, the exit passage also comprising a slit orifice downstream of the first portion; and

    selecting the angle of the wall with respect to the direction of flow of the beneficial agent based on the viscosity of the beneficial agent so that the force of the flow of the beneficial agent opens the slit orifice to deliver the beneficial agent substantially without diffusion of external liquids into the chamber.

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