Rotary cam actuated linear peristaltic pump
Inactive Publication Date: 2012-10-11
MOMENI AHMAD
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- Abstract
- Description
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- Application Information
AI Technical Summary
Benefits of technology
[0011]The cams are mounted to a rotating cam shaft. The cam shaft is rotated with a motor. A motor and the cam shaft are in mechanical communication with each other by way of a worm drive and a worm gear. The worm drive and worm gear provide a gear reduction (i.e., mechanical advantage) so that a smaller motor is capable of running the pump. Moreover, the worm drive and worm gear prevent reverse rotation of the cam shaft during operation. This prevents fluid from back flowing through the tube. The cams also raise lifters which provide a mechanical advantage to reduce the load required to lift or traverse the pistons to the extended position. In particular, the pistons are preferably disposed about half way between a pivot point of the lifter and the cam. As such, the cam need only generate about one half the force to lift the piston to raise the piston since the lifter functions as a lever. Accordingly, a smaller motor can flow fluid through the tube at a greater rate (e.g., 1500 mL), as discussed below.
Problems solved by technology
Unfortunately, the peristaltic pump disclosed in the '921 patent has certain limitations.
In doing so, it is difficult to fit the locator pin and the shut off valve into the recesses due to the curved configuration of the fingers and the curved bottom surface of the platen.
However, the pump is top heavy causing the pump to be unstable and shift during installation of the tube.
Another limitation of the device disclosed in the '921 patent is that the flow rate through the pump is low fluid in the range of 600 mL.
Unfortunately, to do so, the size of the motor must be enlarged to handle the increased load.
The pump disclosed in the '921 patent is relatively heavy.
Enlarging the motor would undesirably increase the weight of the pump and may cause further instability.
Method used
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[0047]Referring now to the drawings, a peristaltic pump 10 is shown. The peristaltic pump 10 is operative to receive a tube 12 that can flow fluid therethrough. As shown in FIG. 10, a plurality of pistons 14a-h are traversable between an extended position (see piston 14a) and a retracted position (see piston 14d). The pistons 14a-h are sequentially traversed to the extended position from the retracted position from the right to the left to flow fluid through the tube 12 in the direction of arrow 16. The pistons 14a-h sequentially squeeze the tube 12 to urge the fluid through the tube 12. The pistons 14a-h move in a wave format as cams 18a-h are rotated in the direction of arrow 22 to continuously urge the fluid through the tube 12. The plurality of cams 18a-h, n are mounted to a cam shaft 20 that rotates in the direction of arrow 22 shown in FIG. 10. Each of the cams 18a-h have multiple lobes 24a-d (see FIG. 11). The lobes 24a-d of the cams 18a-h lift lifters 26a-h which act as a le...
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A rotary cam actuated linear peristaltic pump includes a plurality of cams which actuate a plurality of pistons. The cams apply a force to the piston by way of a lifter for providing mechanical advantage so that a smaller motor may be used to rotate the cam. Each piston of a plurality of pistons is sequentially raised to the extended position to squeeze a tube so as to flow fluid through the tube.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not ApplicableSTATEMENT RE: FEDERALLY SPONSORED RESEARCH / DEVELOPMENT[0002]Not ApplicableBACKGROUND[0003]The embodiments discussed herein relate to a peristaltic pump.[0004]Peristaltic pumps are typically used in medical applications for metering intravenous infusion of a medication into a patient. Peristaltic pumps may also be used for withdrawing fluid such as in wound drainage procedures. To this end, various linear and curvilinear peristaltic pumps have been introduced into the market place.[0005]For example, the curvilinear peristaltic pump described in U.S. Pat. No. 6,164,921 (hereinafter '921 patent) was introduced into the marketplace. The entire contents of the '921 patent is expressly incorporated herein by reference. The first named inventor of the '921 patent is the inventor of the device described below in the detailed description section. As shown in FIG. 7 of the '921 patent, a flexible tubing is inserted between a plurality...
Claims
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Login to View More IPC IPC(8): F04B43/12
CPCF04B43/12F04B43/082
InventorMOMENI, AHMAD
OwnerMOMENI AHMAD