Infusion pumping apparatus
First Claim
Patent Images
1. Infusion pumping apparatus comprising:
- an infusion tube for conducting infusion fluid;
and a rotor cassette for pumping infusion fluid through said infusion tube by repetitively compressing said infusion tube, said cassette having;
(a) a housing having a rotor cavity and inlet and outlet passages extending through said housing from the outside surface of said housing to two spaced points in said rotor cavity, said rotor cavity and said inlet and outlet passages containing said infusion tube;
(b) a rotor body mounted for rotation within said rotor cavity; and
(c) a plurality of rollers mounted at the periphery of said rotor body for rotation about axes parallel to the rotation axis of said rotor body, said rollers positioned and sized to compress said infusion tube, each roller having a peripheral groove extending around the circumference of said roller and positioned inward of the edges of said infusion tube when compressed.
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Abstract
Infusion pumping apparatus having means for releasing back pressures which can develop in an infusion tube (18) through which fluid is being driven. When an excessive back pressure is developed, the infusion tube expands into a peripheral groove (43) on a drive roller (38) carried at the periphery of a rotor body (20).
30 Citations
18 Claims
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1. Infusion pumping apparatus comprising:
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an infusion tube for conducting infusion fluid; and a rotor cassette for pumping infusion fluid through said infusion tube by repetitively compressing said infusion tube, said cassette having; (a) a housing having a rotor cavity and inlet and outlet passages extending through said housing from the outside surface of said housing to two spaced points in said rotor cavity, said rotor cavity and said inlet and outlet passages containing said infusion tube; (b) a rotor body mounted for rotation within said rotor cavity; and (c) a plurality of rollers mounted at the periphery of said rotor body for rotation about axes parallel to the rotation axis of said rotor body, said rollers positioned and sized to compress said infusion tube, each roller having a peripheral groove extending around the circumference of said roller and positioned inward of the edges of said infusion tube when compressed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Infusion pumping apparatus comprising:
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an infusion tube for conducting infusion fluid; a housing for containing said infusion tube; and drive means within said housing for repetitively compressing said tube to drive selected amounts of fluid through said tube; said housing and said drive means having spaced working surfaces between which said tube is positioned and one of said working surfaces having a relief into which said tube expands upon development of a predetermined pressure within said tube, said relief positioned inward of the edges of said infusion tube when compressed. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification