Drug Level Sensor for Injection Device
1 Assignment
0 Petitions
Accused Products
Abstract
A dispensing chamber assembly has a dispensing chamber housing, a plunger, and a level sensor. The dispensing chamber housing at least partially surrounds a dispensing chamber that holds a quantity of a substance. The plunger is fluidly sealed to the inner surface of the dispensing chamber housing. The level sensor detects when the dispensing chamber is substantially full.
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Citations
19 Claims
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1-11. -11. (canceled)
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12. A dispensing chamber assembly comprising:
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a dispensing chamber housing at least partially surrounding a dispensing chamber, the dispensing chamber for holding a quantity of a substance and a quantity of air; a plunger fluidly sealed to the inner surface of the dispensing chamber housing; and first and second electrical contacts for determining when the dispensing chamber is substantially full and the quantity of air is substantially, but not completely, purged from the dispensing chamber; wherein the substance touches the first and second contacts thereby closing an electrical circuit to indicate that the quantity of air is substantially, but not completely, purged from the dispensing chamber. - View Dependent Claims (13, 14, 17, 18, 19)
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15. A method of injecting a drug suspended in a phase transition compound into an eye, the method comprising:
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altering the temperature of a quantity of a substance and a quantity of air contained in a dispensing chamber; after the temperature of the quantity of the substance and the quantity of the air has been altered, activating an actuator to move a plunger located in the dispensing chamber;
expelling a substantial amount of the quantity of air from a dispensing chamber;detecting when the substance has reached a specific location; and activating the actuator a second time to move the plunger to dispense the substance from the dispensing chamber. - View Dependent Claims (16)
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Specification