Infusion device with disposable elements
First Claim
1. A device for pumping fluid through a conventional resilient I.V. delivery tube which comprises:
- a base;
a platen mounted on said base for holding said conventional tube;
means mounted on said base for alternately squeezing said tube against said platen in a first location and at a second location, said squeezing means comprising a first pumping finger mounted on said base to continuously urge against said tube partially occluding said tube initially at a relatively rapid pace and then progressively slower as said tube becomes more deformed to uniformly displace fluid at said first location and a second pumping finger mounted on said base to continuously urge against said tube partially occluding said tube initially at a relatively rapid pace and then progressively slower as said tube becomes more deformed to uniformly displace fluid at said second location partially occluding said tube at said first location; and
means mounted on said base and synchronized with said squeezing means comprising a first pinching finger mounted on said base for alternately occluding said tube upstream from said first location and between said first and second locations, said first location being squeezed as said tube is occluded upstream from said first location with said first and second pumping fingers shaped to urge against a relatively larger area than said first pinching finger.
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Accused Products
Abstract
An infusion device with a disposable administration set which is inexpensive to manufacture. In the preferred embodiment of the present invention the disposable administration set has a plurality of elongated cam followers connected to a plate assembly, wherein the cam followers are displaced in a predetermined sequence and forced against a delivery tube by cam means driven by rotary drive means. The disposable administration set is injection molded as a single integral piece. The disposable administration set includes adjustment spacers disposed between the plate assembly and the cam followers which adjust the distance between them to keep the device accurate. In the preferred embodiment of the present invention the cam means are configured to provide fluid delivery at a consistent and uniform rate.
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Citations
5 Claims
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1. A device for pumping fluid through a conventional resilient I.V. delivery tube which comprises:
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a base; a platen mounted on said base for holding said conventional tube; means mounted on said base for alternately squeezing said tube against said platen in a first location and at a second location, said squeezing means comprising a first pumping finger mounted on said base to continuously urge against said tube partially occluding said tube initially at a relatively rapid pace and then progressively slower as said tube becomes more deformed to uniformly displace fluid at said first location and a second pumping finger mounted on said base to continuously urge against said tube partially occluding said tube initially at a relatively rapid pace and then progressively slower as said tube becomes more deformed to uniformly displace fluid at said second location partially occluding said tube at said first location; and means mounted on said base and synchronized with said squeezing means comprising a first pinching finger mounted on said base for alternately occluding said tube upstream from said first location and between said first and second locations, said first location being squeezed as said tube is occluded upstream from said first location with said first and second pumping fingers shaped to urge against a relatively larger area than said first pinching finger. - View Dependent Claims (2, 3)
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4. A device for pumping fluid through a conventional resilient I.V. delivery tube which comprises:
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a base; a platen mounted on said base and adapted to hold said conventional tube; a first pumping finger mounted on said base to urge against and deform said tube with movement between a withdrawn position and an extended position with movement in the extended position at a relatively rapid pace and then progressively slower as the tubing becomes deformed; a second pumping finger mounted on said base to urge against and deform said tube with movement between a withdrawn position and an extended position with movement in the extended position at a relatively rapid pace and then progressively slower as the tubing becomes deformed, said first pumping finger partially occluding said tube to uniformly displace a fluid volume that is approximately twice the fluid volume uniformly displaced by the partially occluding movement of said second pumping finger; means for moving said second pumping finger is moved toward its said withdrawn position and moving said first finger toward its said withdrawn position as said second finger is moved toward its said extended position including a shaft having first and second eccentric cam lobe portions to engage first and second orifices formed on said first and second pumping fingers respectively; a first valve including a first pinching finger mounted on said base for movement over a range of motion of from one to three times a wall thickness of said tube by a third eccentric cam lobe portion on said shaft which contacts a third orifice on said first pinching finger for occluding said tube upstream from said first pumping finger as said first pumping finger moves toward its extended position; and a second valve including a second pinching finger mounted on said base for movement over a range of motion of from one to three times a wall thickness of said tube by a fourth eccentric cam lobe portion on said shaft which contacts a fourth orifice on said second pinching finger for occluding said tube between said first and second pumping fingers as said second finger moves toward its extended position with said first and second pinching fingers contacting a relatively smaller area of said I.V. delivery tube than said first and second pumping fingers. - View Dependent Claims (5)
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Specification