Device for Delivering Medicament
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a device for the delivery of predetermined doses of liquid medicament to a patient, which medicament is intended to be inhaled by the patient or intended to be injected into the body of the patient. The device is adapted to be in a medicament delivery state and in a medicament non-delivery state. When the device is in a medicament delivery state, said device is adapted to drive a piston into a cartridge containing the liquid medicament to be delivered, with a force that is above or equal to a predetermined minimum force value and below a predetermined maximum force value. The minimum force value is the lowest force value needed to deliver the predetermined dose and the maximum force value is the first force value at which it exists a risk of damaging the cartridge or the components of the device. Further, more of the spring force is brought to an efficient output torque ensuring that a predetermined volume of medicament is expelled from a cartridge.
35 Citations
26 Claims
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1-12. -12. (canceled)
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13. A device for delivering predetermined doses of liquid medicament, the device having a medicament delivery state and a medicament non-delivery state and comprising:
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a cartridge configured to contain the liquid medicament and a piston sealingly and slidably arranged in the cartridge; an energy accumulating member configured to stepwise accumulate energy when the device is in the medicament non-delivery state; an elongated threaded plunger rod arranged in an interior of the device; a plunger rod driving member configured to engage the threaded plunger rod and be in a driven state when the device is in the medicament delivery state and in a non-driven state when the device is in the medicament non-delivery state, wherein rotation of the plunger rod driving member due to output torque of the energy accumulating member drives the threaded plunger rod, enabling the threaded plunger rod, which is in contact with the piston, to be driven toward a proximal end of the cartridge by a predetermined distance and expel a predetermined dose of the liquid medicament from the cartridge; and a bearing coupled to an outer cover and configured to pick up forces acting on a proximal part of the device in a longitudinal direction thereof, whereby more of the accumulated energy that results from stepwise rotational tensioning of the energy accumulating member positioned at a distal end of the device is converted to output torque. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification