Medication infusion pump
First Claim
1. A disposable insert for a liquid injection device having a first surface for engagement with the insert and a first surface for alignment of the insert, said disposable insert comprising:
- a reservoir,an outlet,a pump disposed between said reservoir and said outlet, said pump including a housing that defines a variable volume pump chamber and a second engagement surface, said pump further including a piston located in said pump chamber,a first check valve disposed between said reservoir and said pump chamber,a second check valve disposed between said pump chamber and said outlet,movable means for altering the volume of said pump chamber, said movable means including an armature of electromagnetic material that is secured to and movable with said piston, said armature being movable between the first engagement surface of the injection device and the second engagement surface of the disposable insert to control said piston, andsecond alignment surface means disposed in a predetermined position relative to said second engagement surface and cooperating with said first alignment surface means to accurately position said second engagement surface with respect to said first engagement surface.
6 Assignments
0 Petitions
Accused Products
Abstract
An extracorporeal medication infusion device provides a precise infusion rate of a liquid medication into a human or animal body. The infusion device includes a permanent portion which has a case, a battery, a programmable electronic controller, and an electromagnetic solenoid core and solenoid coil for providing an actuation force. The infusion device also includes a disposable portion which includes a reservoir filled with a liquid medication that is to be dispensed and a pump for pumping the medication from the reservoir into the user'"'"'s body. The pump includes a pump chamber and a piston connected to an electromagnetic armature for altering the volume of the pump chamber in response to the actuation force.
288 Citations
8 Claims
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1. A disposable insert for a liquid injection device having a first surface for engagement with the insert and a first surface for alignment of the insert, said disposable insert comprising:
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a reservoir, an outlet, a pump disposed between said reservoir and said outlet, said pump including a housing that defines a variable volume pump chamber and a second engagement surface, said pump further including a piston located in said pump chamber, a first check valve disposed between said reservoir and said pump chamber, a second check valve disposed between said pump chamber and said outlet, movable means for altering the volume of said pump chamber, said movable means including an armature of electromagnetic material that is secured to and movable with said piston, said armature being movable between the first engagement surface of the injection device and the second engagement surface of the disposable insert to control said piston, and second alignment surface means disposed in a predetermined position relative to said second engagement surface and cooperating with said first alignment surface means to accurately position said second engagement surface with respect to said first engagement surface. - View Dependent Claims (2, 3, 4)
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5. A disposable insert for a liquid injection device having a first surface for engagement with the insert, said disposable insert comprising:
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a variable volume collapsible reservoir, an outlet, a pump disposed between said reservoir and said outlet, said pump including a piston located in a variable volume pump chamber and a housing that defines a second engagement surface, and movable means connected to said piston and movable relative to said pump housing to alter the volume of said pump chamber, said movable means including a solenoid armature of electromagnetic material that is movable between the first engagement surface of the injection device and the second engagement surface of the disposable insert to control said piston. - View Dependent Claims (6, 7, 8)
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Specification