Pump mechanism having a drive motor with an external rotor
First Claim
1. Apparatus for applying a force to a fluid container to cause fluid in the container to move from one position to another, comprising:
- an electric motor comprising a stator and a rotor, the rotor providing rotational motion and being located such that it rotates about the stator;
a drive device positioned on the outer surface of the rotor and rotating with the rotor for providing a rotational drive force; and
a follower disposed in contact with the drive device and mounted in relation thereto so as to translate the rotational drive force of the drive device into a linear drive force, the follower having a contact surface and the follower being located so as to apply the linear drive force against the fluid container with the contact surface to move the fluid.
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0 Petitions
Accused Products
Abstract
A pump mechanism using a drive motor having an external rotor. In one case, cams are mounted on the external surface of the rotor. Cam followers or peristaltic fingers engage the cams and move linearly in response to the rotational cam motion. The cam surfaces are rotated from adjacent cam surfaces to achieve a peristaltic effect through the peristaltic fingers sequentially pressing against the fluid tubing. In another case, the external surface of the rotor is threaded and elongated. A nut is mounted on the rotor and confined to travel in only a linear direction. A coupling arm is connected between the nut and a syringe plunger to force the plunger into the syringe barrel and thereby move the fluid.
186 Citations
18 Claims
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1. Apparatus for applying a force to a fluid container to cause fluid in the container to move from one position to another, comprising:
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an electric motor comprising a stator and a rotor, the rotor providing rotational motion and being located such that it rotates about the stator; a drive device positioned on the outer surface of the rotor and rotating with the rotor for providing a rotational drive force; and a follower disposed in contact with the drive device and mounted in relation thereto so as to translate the rotational drive force of the drive device into a linear drive force, the follower having a contact surface and the follower being located so as to apply the linear drive force against the fluid container with the contact surface to move the fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for applying a force to a fluid tubing to cause fluid in the tubing to move from one position to another, comprising:
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an electric motor comprising a stator and a rotor, the rotor providing rotational motion and being located about the stator; a cam positioned on the outer surface of the rotor and rotating with the rotor for providing a rotational driving force; and a cam follower disposed in contact with the cam and mounted in relation thereto so as to translate the rotational drive force of the cam into a linear drive force, the cam follower having a contact surface and the follower being located so as to apply the linear drive force against the flexible tubing with the contact surface to move the fluid in accordance with the movement of the cam. - View Dependent Claims (10, 11)
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12. Apparatus for applying a force to a fluid container to cause fluid in the container to move from one position to another, comprising:
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an electric motor comprising a stator and a rotor, the rotor providing rotational motion and being located about the stator; wherein the rotor includes threads formed in its outer surface for providing a rotational driving force; and a follower comprising a nut mounted on the threads of the rotor for translating the rotational drive force of the threads into linear drive force, the follower further comprising a coupling arm from the nut to the fluid container to couple the linear drive force of the nut to the fluid container to force the fluid in the fluid container to move the fluid. - View Dependent Claims (13, 14)
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15. A method for moving a fluid in a fluid container comprising the steps of:
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positioning a rotor in relation to a stator such that a motor is formed in which the rotor rotates about the stator; converting the rotational drive force of the rotor into linear drive force; and applying the linear drive force to the fluid container to move the fluid. - View Dependent Claims (16, 17, 18)
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Specification