Infusion pump
First Claim
1. An infusion pump for delivering liquid to a body at an adjustably controlled rate of delivery, said pump comprising a syringe section including a syringe barrel having a nozzle at one end and an inner end of a syringe piston in said syringe barrel with an outer end of said syringe piston extending out of the other end of said barrel,a drive mechanism comprising a generally cylindrical housing having one end mounted to the other end of said syringe barrel, said outer end of said piston extending into said one end of said housing,a gas spring at the other end of said housing,dampening/timing means positioned between said gas spring and said outer end of said syringe piston, said dampening/timing means including a viscous fluid which is movable through a passageway in said housing from a space adjacent said gas spring to a space above said piston, andadjustment means for adjusting the flow rate of the viscous fluid through said passageway and between said spaces.
9 Assignments
0 Petitions
Accused Products
Abstract
The infusion pump delivers liquid to a body at an adjustably controlled rate of delivery. The pump comprises a syringe section including a syringe barrel having a nozzle at one end. A syringe piston has an inner end situated in the syringe barrel and an outer end extending out of the other end of the syringe barrel. A drive mechanism comprising a generally cylindrical housing has one end mounted to the other end of the syringe barrel. The outer end of the piston extends into the one end of the housing. A gas spring is situated at the other end of the housing and a dampening/timing mechanism is positioned between the gas spring and the outer end of the syringe piston. The dampening/timing mechanism includes a viscous fluid which is movable through a passageway in the housing from a space adjacent the gas spring to a space above the piston. A control mechanism is provided for altering the flow rate of the viscous fluid through the passageway and between the spaces.
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Citations
20 Claims
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1. An infusion pump for delivering liquid to a body at an adjustably controlled rate of delivery, said pump comprising a syringe section including a syringe barrel having a nozzle at one end and an inner end of a syringe piston in said syringe barrel with an outer end of said syringe piston extending out of the other end of said barrel,
a drive mechanism comprising a generally cylindrical housing having one end mounted to the other end of said syringe barrel, said outer end of said piston extending into said one end of said housing, a gas spring at the other end of said housing, dampening/timing means positioned between said gas spring and said outer end of said syringe piston, said dampening/timing means including a viscous fluid which is movable through a passageway in said housing from a space adjacent said gas spring to a space above said piston, and adjustment means for adjusting the flow rate of the viscous fluid through said passageway and between said spaces.
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20. A unitary infusion pump for controlling dispensing of a liquid from a syringe barrel, said pump comprising:
- housing means including a syringe barrel, a plunger situated in said syringe barrel and having an inner end and an outer end, drive means in said housing means positioned to cause relative movement between said syringe barrel and said plunger, said drive means including a sealed variable volume chamber, a viscous fluid in said chamber and motive means for causing relative movement between said syringe barrel and said plunger, by causing said viscous fluid to be displaced in said housing from said chamber, and means for throttling the displacement of said viscous fluid in said housing.
Specification