Needleless injector
First Claim
Patent Images
1. An injector, comprising:
- a housing having a chamber for holding a liquid formulation of an active principle to be injected into a biological body and an output port in fluid communication with the chamber, the liquid formulation being injected though the output port; and
a piston positioned within the housing, the piston including an end portion with substantially the same shape as the chamber, the piston and housing being drawn together by a magnetic force to expel the liquid formulation out of the chamber through the output port.
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Accused Products
Abstract
An injector includes a housing having a chamber for holding a liquid formulation of an active principle to be injected into a biological body and an output port in fluid communication with the chamber through which the liquid formulation is injected. A piston is positioned within the housing, and includes an end portion with substantially the same shape as the chamber. A magnetic force draws the piston and housing together to expel the liquid formulation out of the chamber through the output port.
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Citations
51 Claims
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1. An injector, comprising:
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a housing having a chamber for holding a liquid formulation of an active principle to be injected into a biological body and an output port in fluid communication with the chamber, the liquid formulation being injected though the output port; and
a piston positioned within the housing, the piston including an end portion with substantially the same shape as the chamber, the piston and housing being drawn together by a magnetic force to expel the liquid formulation out of the chamber through the output port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An actuator, comprising:
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a fiber of shape memory alloy under tension, the tension being produced by a magnetic force; and
a capacitor which discharges a potential to the fiber to cause the fiber to contract, the fiber relaxing to a stretched state when the potential is removed. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. An injector, comprising:
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a housing having a chamber for holding a liquid formulation of an active principle to be injected into a biological body and an output port in fluid communication with the chamber, the liquid formulation being injected though the output port;
a piston positioned within the housing, the piston including an end portion with substantially the same shape as the chamber; and
an actuator attached to the piston and made of shape memory alloy, the piston and housing being drawn together by a magnetic force, the actuator moving the piston away from the housing when a potential is applied to the actuator, and the piston moving towards the housing when the voltage is removed to expel the liquid formulation out of the chamber through the output port.
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29. An actuator, comprising:
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a contracting material under tension, the tension being produced by a magnetic force; and
a capacitor which discharges a potential to the fiber to cause the fiber to contract, the fiber relaxing to a stretched state when the potential is removed. - View Dependent Claims (30, 31)
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32. A method of injecting a liquid formulation of an active principle into a biological body, comprising:
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holding a liquid formulation of an active principle in a chamber of a housing, the chamber being in fluid communication with an output port through which the liquid formulation is injected;
positioning a piston within the housing, the piston including an end portion with substantially the same shape as the chamber; and
applying a magnetic force between the housing and the piston to draw the piston and the housing together;
expelling the liquid formulation from the chamber through the output port as the piston moves towards the housing. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of actuating a fiber of shape memory alloy, comprising;
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applying a tension to the fiber with a magnetic force; and
discharging a capacitor to apply a potential to the fiber to cause the fiber to contract, the fiber relaxing to a stretched state when the potential is removed. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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Specification