Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1976-07-02
1978-12-26
Croyle, Carlton R.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
138118, F04B 4308, F04B 4312, F04B 4506
Patent
active
041313992
ABSTRACT:
A peristaltic pump equipped with at least one peristaltic tube is disclosed characterized in that the said tube is associated with means which limit its occlusion, independently of the physical and/or mechanical stresses to which it may be subjected. The peristaltic tube is provided with at least one longitudinal groove or ridge on the internal surface of its wall. Alternatively, a strand may extend longitudinally inside the peristaltic tube, at least over the part subjected to the action of the pressing devices, and this strand is rigid or semi-rigid and has the shape of an arc of a circle. The strand may be flexible and may be firmly attached to the peristaltic tube at least at a point located upstream from the pressing devices. Various other geometrical arrangements are disclosed. The peristaltic pump is especially adapted to extracorporal blood circulation. The peristaltic tube is of such dimensions that when flattened transversely, there remains at least one passage, the ratio of the cross-section of the passage to the cross-section of the channel of the tube at rest being between 1/10 and 1/10,000. The peristaltic tube consists of a silicone elastomer and may be coated on the internal surface and/or the external surface with a thin layer of a silicone elastomer.
REFERENCES:
patent: 460944 (1891-10-01), Burson
patent: 2693766 (1954-11-01), Seyler
patent: 2854028 (1958-09-01), Ballard et al.
patent: 3056428 (1962-10-01), Brown et al.
patent: 3128716 (1964-04-01), Stallman et al.
patent: 3192863 (1965-07-01), Vadot
patent: 3508587 (1970-04-01), Mauch
patent: 3685787 (1972-08-01), Adelberg
patent: 3784323 (1974-01-01), Sausse
patent: 4029441 (1977-06-01), Fischer
Croyle Carlton R.
Honor Robert S.
Jewell Walter F.
Rhone-Poulenc Industries
Ross Thomas I.
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