Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1996-03-28
1997-08-12
Gluck, Richard E.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
4174776, F04B 4312
Patent
active
056558970
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a peristaltic pump cassette that permanently closes its tube the first time that the drive spindle is inserted.
Peristaltic pumps provide a uniform and controllable flow. They are frequently used particularly for medical purposes, for example to control injections.
Peristaltic pumps are frequently provided with a cassette designed to cooperate with the spindle of a motor which drives mobile components by friction.
This type of cassette includes a casing, a deformable tube and rotating rollers.
The deformable tube forms a loop in a plane applied to a bearing surface of the casing by rotating rollers.
These rotating rollers are driven in rotation by the motor spindle and cause deformation of the tube thus producing the required peristaltic effect.
Many publications have disclosed pumps and peristaltic pump cassettes, for example:
French patent application FR-A-2.595.765 which describes and illustrates a peristaltic pump comprising at least 2 elastic tubes placed in parallel and several pressure rollers acting on these elastic tubes. The purpose of this pump is to output a uniform flow.
French patent application FR-A-2,644,212 deals with a cassette for a peristaltic pump with a deformable tube and the pump fitted with this type of cassette. The cassette includes a casing which is fitted with a cylindrical rolling track close to each of its ends, against which satellites are applied and roll compressing the deformable tube located between the two rolling tracks. The cassette described and illustrated is easy to build and is robust.
French patent application FR-A-2.644.522 concerns a peristaltic pump with deformable tube comprising independent deformable tube arcs inside the casing, which gives an instantaneous reduction in flow fluctuations. The pump is compact.
The use of peristaltic pumps with cassettes in a hospital environment can improve the safety of health care. Throwaway cassettes, separable from the motor unit, have made a significant improvement in this respect.
The use of a polarizing device to prevent a cassette from being used with a motor unit for which it is not designed, is another important step in improving reliability.
However, it was found that, when separated from its motor unit, a cassette could accumulate liquid in the tube passing therethrough, which in some cases could bring about risks. For example, a perfusion liquid could be mistakenly injected under uncontrolled conditions.
In order to solve this difficulty, it was planned to use peristaltic pump cassettes in which the deformable tube is compressed and blacked when the pump is installed. However, compressing the tube in this way at a given point continuously after mounting and before using the pump, could cause permanent deformation of the tube which could be harmful to its future use.
Therefore, the purpose of this invention is to propose a peristaltic pump cassette in which the tube is permanently blacked after its first use, regardless of its subsequent configuration and position with respect to the motor unit.
Another object of the invention is to provide this type of self-closing cassette which can be stored, after first use, without causing damage to the tube.
Yet another object of this invention is to provide a relatively easy to make self-closing peristaltic pump cassette, for which the production cost remains reasonable.
Thus, the invention concerns a peristaltic pump cassette designed to work in cooperation with a motor unit the first time that it is used, through a drive spindle comprising: rotating rollers, in order to drive the liquid contained in it.
According to the invention, before the first use the rollers are in a radial position in which the tube is not blocked: the first time that the cassette is used, the rollers are moved radially as the drive spindle is inserted, blocking the tube; after use, the rollers remain in a radial position that keeps the tube closed.
The following characteristics are possible, either separately or in all technically possible combinations, depending on the dif
REFERENCES:
patent: 4702679 (1987-10-01), Malbec
Bouvier Bernard
Neftel Frederic
Debiotech S.A.
Gluck Richard E.
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