Intravenous fluid infusion device
First Claim
1. An intravenous fluid infusion device for infusing a fluid into a patient at a controlled flow rate, comprising:
- a cylindrical houding unit;
an outlet tubing in fluid communication with said housing unit;
a syringe housing disposed partially within said housing unit;
a syringe plunger disposed at least partially within said syringe housing;
a control unit disposed within said housing unit and providing fluid communication between said syringe housing and said tubing; and
an elastomeric member means extending radially outwards of said housing unit and said syringe housing and further extending from the proximal end of said housing unit to the distal end of said syringe plunger, said elastomeric member means being for providing a longitudinal force of preselected varying magnitude over time between said housing unit and said syringe plunger.
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Accused Products
Abstract
An infuser for dispensing medicaments to a patient at a preselected controlled flow rate. A housing unit is provided having a precalibrated flow control valve assembly portion sized to the desired flow rate. At the outer proximal end of the housing an outlet tubing or catheter is interconnected to the flow control valve assembly. A conventional syringe has its proximal end removably and sealably contained within the housing with its tip portion in sealingly mating engagement with the flow control valve assembly whereby the housing, syringe, and valve assembly are disposed in coaxial alignment. Elastomeric members are disposed on either side of the syringe and housing, each such member being anchored at opposed ends to the proximal end of the housing and the distal end of the syringe plunger. Restorative force applied to the syringe by the energy stored in the distended elastomeric members controls, over time, the force at which the plunger is introduced into the syringe housing, thereby controlling the infusion rate of the medicaments stored in the syringe.
49 Citations
20 Claims
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1. An intravenous fluid infusion device for infusing a fluid into a patient at a controlled flow rate, comprising:
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a cylindrical houding unit; an outlet tubing in fluid communication with said housing unit; a syringe housing disposed partially within said housing unit; a syringe plunger disposed at least partially within said syringe housing; a control unit disposed within said housing unit and providing fluid communication between said syringe housing and said tubing; and an elastomeric member means extending radially outwards of said housing unit and said syringe housing and further extending from the proximal end of said housing unit to the distal end of said syringe plunger, said elastomeric member means being for providing a longitudinal force of preselected varying magnitude over time between said housing unit and said syringe plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An infusion device comprising:
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syringe means defining a cavity for containing fluid and comprising a syringe housing and a syringe plunger in coaxial alignment alongitudinal axis and in slidable engagement; tube means in fluid connection with said cavity for delivering said fluid from said cavity through said tube means to a patient; and elongate elastomeric band means having a preselected coefficient of elasticity and interconnected between said syringe housing and said syringe plunger for decreasing the volume of said cavity at a preselected controlled rate varying over time as a function of said preselected coefficient of elasticity. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of charging an infusion device with fluid having a housing unit, an outlet tube in fluid communication with said housing unit, a syringe housing slidably disposable partially within said housing unit, a syringe plunger slidably disposable within said syringe housing, an elastomeric member interconnected between said housing unit and said syringe plunger, a control unit contained within said housing unit and providing fluid communication between said outlet tube and a cavity defined by said syringe housing and said syringe plunger, a distal portion of said control unit and a proximal portion of said syringe housing being releasably interconnectable, and a filler needle, said method comprising:
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attaching said filler needle to said proximal portion of said syringe housing; introducing said filler needle into a reservoir of said fluid; withdrawing said syringe plunger partially from said syringe housing to fill said cavity with said fluid; removing said filler needle from said proximal end of said syringe housing; inserting said syringe housing into said housing unit; interconnecting said proximal end of said syringe housing to said distal end of said control unit; and interconnecting said elastomeric member between said syringe plunger and said syringe housing. - View Dependent Claims (18, 19, 20)
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Specification