Dosing Operation In A Medical Device
First Claim
1. A method of controlling a dosing operation where a piston in a medical device is moved to a desired position of movement, the dosing operation applies a motor to provide a force from the piston to expel a dose of a liquid medicament, said method comprising:
- moving the piston, at a first fixed speed, to a first position of the movement,moving the piston, at a decreasing speed, from said first position to a second position of the movement, and moving the piston, at a second fixed speed, from said second position to the desired position Sref.
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Accused Products
Abstract
This invention relates to a method of controlling a dosing operation where a piston in a medical device is moved to a desired position, the dosing operation applies a motor to provide a force from the piston to expel a dose of a liquid medicament, said method comprising the steps of: moving the piston, at a first fixed speed, to a first position of the movement, moving the piston, at a decreasing speed, from said first position to a second position of the movement, and moving the piston, at a second fixed speed, from said second position to the desired position of the movement. The method further comprises the step of letting a fixed waiting time pass, when the piston has reached the desired position. This enables for a precise movement and stop of the piston leading to a precise dose, minimized post dripping and to that only a fixed and short waiting time need to go before a user can withdraw an injection needle of the medical device from his skin.
29 Citations
20 Claims
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1. A method of controlling a dosing operation where a piston in a medical device is moved to a desired position of movement, the dosing operation applies a motor to provide a force from the piston to expel a dose of a liquid medicament, said method comprising:
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moving the piston, at a first fixed speed, to a first position of the movement, moving the piston, at a decreasing speed, from said first position to a second position of the movement, and moving the piston, at a second fixed speed, from said second position to the desired position Sref. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification