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DRUG DELIVERY DEVICE AND METHOD

  • US 20060206054A1
  • Filed: 04/23/2006
  • Published: 09/14/2006
  • Est. Priority Date: 11/26/2001
  • Status: Active Grant
First Claim
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1. In a drug delivery device having a pressurized source of a liquid medicament delivering the liquid drug to an outlet via a flow path, the flow path including a flow restriction and first and second valves, a method for identifying the presence of a gas bubble in the flow path, the method comprising:

  • (a) operating the first and second valves in such a manner as to ensure a pressure between the first and second valves significantly below a pressure of the pressurized source;

    (b) during a pressure accumulation period, maintaining the first valve open and the second valve closed; and

    (c) at the end of the pressure accumulation period, identifying the presence or absence of a gas bubble in the flow path based at least in part on a measurement of pressure between the first and second valves.

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