Accurate peristaltic pump for non elastic tubing
First Claim
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1. A peristaltic pump comprising:
- a motor driving a rotor, said rotor carrying a plurality of spring biased rollers on its circumference;
a semi-circular back wall, said semi-circular back wall having a fixed part and a rotatable moveable part;
a pair of elastic semi-circular sections are retained through the entire semi-circular back wall, the first of said elastic semi-circular sections retained in the fixed part and the second of said elastic semi-circular sections retained in the rotatable moveable part;
a peristaltic tube is mounted between said plurality of rollers of said rotor and said semi-circular back wall, along said tubes peripheral edges are said pair of elastic semi-circular sections which continuously elastically support said tube along the entire race;
means for correcting the effects of creep in said peristaltic tube, wherein said means for correcting creep include said spring biased rollers, which apply a substantially constant force to pinch said tube, and said means for correcting creep further include said pair of elastic semi-circular sections which fully restore the initial cross-section of said tube in the areas of said race where said rollers are not pinching said tube; and
wherein said spring biased rollers apply a force which is substantially independent of minor tube wall thickness variations.
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Abstract
A peristaltic pump which corrects the effects of creep on a peristaltic tube. A plurality of spring biased rollers apply a substantially constant force to pinch the tube. A pair of elastic semi-circular sections are retained throughout the entire semi-circular back wall of the peristaltic pump. The pair of elastic semi-circular sections fully restore the initial cross-section of the tube in the area of the race where the rollers are not pinching the tube.
35 Citations
1 Claim
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1. A peristaltic pump comprising:
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a motor driving a rotor, said rotor carrying a plurality of spring biased rollers on its circumference; a semi-circular back wall, said semi-circular back wall having a fixed part and a rotatable moveable part; a pair of elastic semi-circular sections are retained through the entire semi-circular back wall, the first of said elastic semi-circular sections retained in the fixed part and the second of said elastic semi-circular sections retained in the rotatable moveable part; a peristaltic tube is mounted between said plurality of rollers of said rotor and said semi-circular back wall, along said tubes peripheral edges are said pair of elastic semi-circular sections which continuously elastically support said tube along the entire race; means for correcting the effects of creep in said peristaltic tube, wherein said means for correcting creep include said spring biased rollers, which apply a substantially constant force to pinch said tube, and said means for correcting creep further include said pair of elastic semi-circular sections which fully restore the initial cross-section of said tube in the areas of said race where said rollers are not pinching said tube; and wherein said spring biased rollers apply a force which is substantially independent of minor tube wall thickness variations.
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Specification
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Current AssigneeSamuel Meiri
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Original AssigneeSamuel Meiri
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InventorsMeiri, Samuel
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Primary Examiner(s)Smith, Leonard E.
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Assistant Examiner(s)Szczecina, Jr., Eugene L.
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Application NumberUS07/492,860Time in Patent Office462 DaysField of Search417/474-477, 604/153US Class Current417/477.7CPC Class CodesF04B 43/1253 by using two or more roller...
