Fluid delivery device needle retraction mechanisms, cartridges and expandable hydraulic fluid seals
First Claim
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1. A fluid delivery device comprising:
- a housing having a first hydraulic chamber and a second hydraulic chamber;
a flow restrictor fluidly coupling the first hydraulic chamber and the second hydraulic chamber;
a cartridge having a container forming a fluid reservoir sealed at a proximal end with a piston, the cartridge being insertable into the housing to couple the piston with the second hydraulic chamber, the fluid reservoir being substantially filled with a liquid and the second hydraulic chamber being filled with a hydraulic fluid prior to inserting the cartridge within the housing, the cartridge including a septum configured to be pierced by a delivery needle; and
an actuator coupled to the housing and configured to deliver a force to the piston through the first and second hydraulic chambers.
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Abstract
A fluid delivery device includes an automatic needle retraction mechanism configured to automatically retract a delivery end of a needle into a housing. In one embodiment, the needle assembly is configured to automatically withdraw the delivery end of the needle into the housing upon an actuator moving from the first position to the second position. In one embodiment, the needle assembly is configured to automatically withdraw the delivery end of the needle into the housing upon decoupling a bottom surface of the housing from a skin surface.
36 Citations
30 Claims
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1. A fluid delivery device comprising:
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a housing having a first hydraulic chamber and a second hydraulic chamber; a flow restrictor fluidly coupling the first hydraulic chamber and the second hydraulic chamber; a cartridge having a container forming a fluid reservoir sealed at a proximal end with a piston, the cartridge being insertable into the housing to couple the piston with the second hydraulic chamber, the fluid reservoir being substantially filled with a liquid and the second hydraulic chamber being filled with a hydraulic fluid prior to inserting the cartridge within the housing, the cartridge including a septum configured to be pierced by a delivery needle; and an actuator coupled to the housing and configured to deliver a force to the piston through the first and second hydraulic chambers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A fluid delivery device comprising:
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a housing having a first hydraulic chamber and a second hydraulic chamber; a flow restrictor fluidly coupling the first hydraulic chamber and a second hydraulic chamber; a cartridge forming a fluid reservoir between a slideable piston and a septum configured to receive a delivery needle, the cartridge including a stopper configured to seal a distal end of the cartridge after the fluid reservoir is substantially filled with a liquid, the piston being coupled with the second hydraulic chamber; and an actuator coupled to the housing and configured to deliver a force to the piston through the first and second hydraulic chambers. - View Dependent Claims (24)
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25. A fluid delivery device comprising:
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a housing having a first hydraulic chamber and a second hydraulic chamber; a flow restrictor fluidly coupling the first hydraulic chamber and a second hydraulic chamber; a fluid reservoir having a piston; a seal sealing an end of the second hydraulic chamber and configured to couple with the piston, the seal being expandable between a compressed position and an expanded position; and an actuator coupled to the first hydraulic chamber and configured to expand the seal, move the piston and deliver a force to the fluid reservoir through the first and second hydraulic chambers. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification