Medical fluid pump
First Claim
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1. A pumping unit comprising:
- an internally sterile pumping chamber having an inlet and an outlet;
a vane mounted for rotation about a hollow shaft, the hollow shaft being in fluid communication with the inlet of said pumping chamber and said vane having a fluid conduit extending therethrough in fluid communication with the hollow shaft;
a flexible diaphragm forming a wall portion of said pumping chamber; and
a drive rod extending through said diaphragm so that one end of said rod engages said vane within said pumping chamber at a position on said vane radially offset from the axis of rotation of the hollow shaft and an other end extends out of said pumping chamber, said drive rod being in a fixed fluidtight attachment with said diaphragm.
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Abstract
A medical pump apparatus including an internally sterile pumping chamber having a flexible diaphragm forming a wall portion and a drive rod extending through the diaphragm in a rotating vane disposed within the pumping chamber. A motor rotates a revolving hook which engages the drive rod to drive the vane within the pumping unit. The pumping chamber is isolated from the motor by the fluidtight attachment of the drive rod through the flexible diaphragm. Fluid is pumped into the inlet of pumping chamber through the hollow shaft of the vane and out through a fluid conduit of the vane, subsequently out the outlet of the pumping chamber.
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Citations
18 Claims
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1. A pumping unit comprising:
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an internally sterile pumping chamber having an inlet and an outlet; a vane mounted for rotation about a hollow shaft, the hollow shaft being in fluid communication with the inlet of said pumping chamber and said vane having a fluid conduit extending therethrough in fluid communication with the hollow shaft; a flexible diaphragm forming a wall portion of said pumping chamber; and a drive rod extending through said diaphragm so that one end of said rod engages said vane within said pumping chamber at a position on said vane radially offset from the axis of rotation of the hollow shaft and an other end extends out of said pumping chamber, said drive rod being in a fixed fluidtight attachment with said diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical pump apparatus comprising:
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a motor; a revolving hook connected for rotation to said motor; an internally sterile pumping chamber having an inlet, an outlet and one end of a drive rod extending out from a diaphragm so that the one end of the drive rod engages said revolving hook to cause the one end of the drive rod to revolve; and a rotatable vane disposed within said pumping chamber and engaged by an opposite end of the drive rod to cause rotation of said vane about an axis, said rotatable vane including a hollow shaft concentric with the axis of rotation, the hollow shaft being in fluid communication with the inlet of said pumping chamber such that rotation of said rotatable vane increases fluid pressure within said pumping chamber to force fluid out through the outlet and draw fluid in through the inlet into the hollow shaft and out of said rotatable vane. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for controlling the flow of fluid into a patient comprising the steps of:
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directing fluid into a shaft of a rotatable vane mounted within a pumping chamber for axial rotation about the shaft; revolving an end of a rod extending from a diaphragm forming a wall of the pumping chamber so as to revolve an opposite end of said rod engaged with the rotatable vane at a position radially offset from the shaft to cause the rotatable vane to rotate; and the rotation of the vane causing the fluid to be pushed out of the pumping chamber through a tube to a patient. - View Dependent Claims (18)
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Specification