Patent ID: 6613019
Filing Date: 2003-09-02
Classification: A61M

Abstract:
A method for delivering an intended dose of medication from a medical injection device containing a cartridge that contains medication and that has moveable piston having an inner wall with an inner wall face that is in contact with the medication, an opposite outer wall having an outer wall face, the inner and outer wall faces being spaced apart from each other, wherein the spacing between the inner and outer wall decreases temporarily after the exertion of a force on the outer wall the method comprising the steps of:a. selecting a dose of medication to deliver; b. advancing the outer wall a distance D, the distance D being equal to the sum of: (i) a first distance D1 that is equal to an amount of displacement necessary that the inner face must move to deliver the dose selected in step a, and (ii) an overshoot distance OD; and c. retracting the outer wall by the overshoot distance OD.