EP0388269B1 - Kassette für eine peristaltische Pumpe mit quetschbarem Schlauch und peristaltische Pumpe mit einer solchen Kassette - Google Patents

Kassette für eine peristaltische Pumpe mit quetschbarem Schlauch und peristaltische Pumpe mit einer solchen Kassette Download PDF

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Publication number
EP0388269B1
EP0388269B1 EP90400644A EP90400644A EP0388269B1 EP 0388269 B1 EP0388269 B1 EP 0388269B1 EP 90400644 A EP90400644 A EP 90400644A EP 90400644 A EP90400644 A EP 90400644A EP 0388269 B1 EP0388269 B1 EP 0388269B1
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EP
European Patent Office
Prior art keywords
rollers
casing
cassette
tube
motor
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90400644A
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English (en)
French (fr)
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EP0388269A1 (de
Inventor
Edouard Malbec
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action

Definitions

  • the invention relates to a cassette for a peristaltic pump with a deformable tube, consisting of a housing which comprises, in the vicinity of each of its ends, a cylindrical raceway against which are suitable for applying and rolling tubular satellites. , intended to be driven by a motor, and which crush the deformable tube located between the two raceways.
  • FR-A-2 383 333 shows, in FIGS. 4 and 5, a sub-assembly forming a removable cassette with motor, for peristaltic pump, comprising tubular satellite rollers kept angularly apart by non-working rollers.
  • the deformable tube has, permanently, a crushed zone whether the pump is in service or not, which limits the possibilities of sterilization of the assembled cassette, and creates fatigue by crushing a determined zone of the deformable tube of the stored cassette.
  • non-working rollers create additional friction, which causes a reduction in mechanical efficiency.
  • EP-0 041 267 shows a cassette, without motor, for peristaltic pump, whose arrangement is relatively complicated.
  • the invention aims, above all, to provide a cassette, without motor, of the kind defined above, which no longer has, or which has to a lesser degree, the drawbacks mentioned above.
  • the cassette be of a simple and robust construction, allow efficient pumping and favorable storage conditions.
  • a cassette for a peristaltic pump with a deformable tube is characterized in that the satellites are mounted freely inside the housing, in the concavity of the deformable tube, this housing comprising, at least one side, a central opening of a diameter sufficient to allow the satellites to be driven, either directly from a rotary plate fitted with planets suitable for engaging in tubular satellites, either from a shaft internally engaged between the tubular satellites, and that, when it is separated from the drive motor, the satellites are brought back towards the center under the pressure of the tube at rest, this tube remaining open, which makes complete sterilization easy.
  • the same cassette can be driven either directly by a plate, this drive mode allowing at any time to know precisely the angular position of the plate and therefore of the satellites, or by a central shaft with possibility of high speed of rotation.
  • the satellites are produced in a simple and economical manner and their free mounting inside the cassette is advantageous for operation with self-centering of the pump. In addition, during storage, the tube is not crushed by the satellites brought back to the center.
  • the housing has an inner groove with a concave section in which the deformable tube is housed, while the satellites have an outer barrel shape, with convex curvature, combined with the concave curvature of the throat of the housing, to press on.
  • the deformable tube, each satellite comprising, on either side of the barrel zone, a cylindrical zone suitable for rolling on the associated raceway; such a concave inner profile housing allows self-centering of the tube and the satellites.
  • the housing comprises a central cylindrical crown on which is fixed, on both sides, in particular by clipping or snap-fastening, a flange having an internal raceway, the flange located on the side of the drive motor having a substantially border frustoconical for securing the housing to a drive motor housing by cooperation of this frustoconical edge with teeth, having a certain elasticity in the radial direction, provided over the entire periphery of a ring gear connected to the housing of the engine.
  • the tubular satellites are generally made of an elastic plastic material.
  • the invention also relates to a peristaltic pump fitted with a cassette such as defined above, this pump comprising a motor capable of driving the tubular satellites.
  • the pump motor comprises an output shaft provided with a plate carrying axes on which are mounted idle rollers suitable for engaging in the tubular satellites.
  • the plate may include, in particular, an axis located in the extension of the motor shaft and on which is mounted for a central roller with a relatively large self-centering game, adapted to cooperate with the outer surface of the satellites.
  • the cassette casing is generally closed on the side opposite the motor by an attached cover, one of the raceways for the satellites being able to be provided on the inside of this cover.
  • the pump plate has four regularly spaced rollers and a central roller, while the cassette has four satellites.
  • Figure 1 of these drawings is a perspective view of a peristaltic pump according to the invention, the cassette being separated from the tray.
  • FIG. 2 is a view of the plate along line II-II, FIG. 5.
  • FIG. 3 is a view of the cassette along line III-III of FIG. 4.
  • Figure 4 is a section along line IV-IV, Figure 3 of the cassette.
  • Figure 5 is a view from the left, with parts torn off, from the plate shown in Figure 2.
  • Figure 6 is a longitudinal section, with exterior parts, of the pump, the plate being mounted inside the cassette.
  • Figure 7 is a section of another embodiment of a pump according to the invention, the cassette being shown in section.
  • Figure 8 is a view along line VIII-VIII, Figure 7 of the ring gear serving as a cassette holder.
  • FIG. 9 is a section of another advantageous embodiment of the cassette.
  • a peristaltic pump 1 comprising a deformable tube 2, in particular made of plastic, forming the pump body.
  • This tube is interposed between an external cylindrical casing 3 and internal rollers 4 suitable for cooperating with a central drive member 5, itself driven by an electric motor 6.
  • the pump 1 comprises a removable cassette 7 consisting of a cylindrical housing 8 in which the tube 2 is mounted, as well as tubular satellites 9, four in number in the embodiment considered.
  • satellites 9 constitute the rollers 4 and are advantageously made of an elastic plastic material.
  • the satellites 9 can be constituted by sections of tube made of extruded plastic.
  • the tube 2 substantially describes a semicircle inside the housing 8 and leaves this housing by openings 10 ⁇ along branches 11 substantially parallel.
  • the face 12 of the housing intended to be applied against the motor 6 has a central opening 13 of sufficient diameter to allow the drive of the satellites 9 as explained below.
  • This face 12 has a diameter greater than that of the housing 8 and forms a flange projecting radially relative to the housing, flange in which are provided two buttonholes 14 diametrically opposed to allow the fixing of the cassette 7 on the motor 6 provided with pins 15 provided with heads capable of cooperating with the buttonholes 14.
  • the casing 8 of the cassette comprises, in the vicinity of each of its ends, in the axial direction, a cylindrical raceway 16, 17 (see FIG. 4) against which are suitable for applying, and for rolling, the tubular satellites 9, the deformable tube 2 being located between the two raceways, against a cylindrical surface 18 whose diameter is greater than that of the raceways 16, 17.
  • the housing 8 is closed, on the side opposite to the motor driving the pump, by an attached cover 19 on which is provided the raceway 17 which constitutes the internal surface of a centering flange of the cover 19 in the housing.
  • the internal face of this cover 19 has a central recess 20 ⁇ .
  • the satellites 9 are held, in the longitudinal direction, between the internal face of the cover 19 and a shoulder 21 (FIG. 4) bordering the opening 13 on the inside of the housing.
  • the distance l , in the axial direction, between this shoulder 21 and the internal face of the cover 19 is only slightly greater than the length axial h of the satellites 9 to ensure good maintenance of these satellites and avoid any oblique setting.
  • the difference l - h is less than or equal to 0 ⁇ , 2 mm.
  • Rollers 22, mounted idly on axes 23 carried by a plate 24, are suitable for engaging in the satellites 9, passing through the opening 13.
  • the rollers 22 are regularly distributed around the axis of the plate 24
  • the number of these rollers 22 is equal to that of the satellites 9, that is to say equal to four in the example considered.
  • each roller 22 remote from the plate 24 has a substantially frustoconical shape to facilitate the entry of the roller in the corresponding satellite 9.
  • the end of the axis 23 is provided with a head 26 capable of holding the roller 22 in the longitudinal direction.
  • the diameter d of the rollers 32 is slightly less than the internal diameter f ( Figure 4) of the satellites 9.
  • the clearance that is to say the difference f - d is advantageously of the order of 0 ⁇ .3 mm.
  • a central roller 27 is mounted to rotate freely on an axis 28 which is located in the extension of the motor shaft 6 when the plate 24 is fixed to this motor shaft.
  • This central roller 27 also has a frustoconical end which is housed in the recess 20 ⁇ (see Figure 6).
  • the head of the axis 26 is housed completely inside a bore provided at the end of this roller 27.
  • the length of the roller 27 is greater than that of the rollers 22.
  • the roller 27 is mounted on its axis 28 with a radial self-centering clearance (difference between the diameter of the internal bore of the roller 27 and the external diameter of the axis 28) relatively large, in particular of the order of 0.5 ⁇ .
  • This roller 27 in particular thanks to the large self-centering play, provides a dynamic balance of all pressures.
  • the fixing of the plate 24 on the output shaft of the motor can be ensured by any means, in particular by locking screws such as 30 (FIG. 1) oriented radially.
  • the satellites 9 are brought back to the center under the pressure of the tube 2 at rest, as visible in FIG. 3, this tube remaining open until stabilization satellites in a tangential position of mutual support. This avoids sticking between the walls of the tube during storage, bonding which could occur if the tube was stored crushed.
  • the tube 2 can be held in place by two welded stop rings designed to be wedged in specific housings under the pressure of a support flange secured to the cover of the cassette.
  • this tube 2 mounts in the cassette very quickly.
  • the cassette 7 having been put in place on the plate 5, the rollers 22 are located inside the tubular satellites 9, which are in abutment against the central roller 27.
  • the cassette is snapped onto the motor frame by a slight rotation who after engagement of the lugs 15 in the large diameter portion of the buttonhole 14, places said lugs in the narrower portion of this buttonhole that the head of the lugs 15 cannot pass through.
  • the drive rollers 22 are housed with a slight clearance inside the tubular satellites 9, while the central support roller 27 exerts its pressure against the outside of the satellites 9 which deviate up to 1 sealing of the tube 2 pump body closure on itself. This assembly can be carried out in a few seconds, with one hand.
  • the pumping action is obtained when the motor 6 is put into rotation, driving the plate 5 and the satellites 9.
  • the rollers 22, driven by the plate 5, do not directly attack the tube 2 pump body, which avoids the stretching of the pump body towards the delivery port and the tendency to close the suction port. This results in a flow curve of the pump as a function of the relatively regular speed of rotation.
  • the central free roller 27 provides support and dynamic balance of all operating pressures.
  • FIGS. 7 and 8 one can see an alternative embodiment of a cassette and a pump according to the invention.
  • the elements of FIGS. 7 and 8 playing identical or similar roles to elements already described with respect to the preceding figures are designated by numerical references equal to the sum of the number 10 ⁇ 0 ⁇ and the reference used in the preceding figures, without their description be taken up in detail.
  • the housing 10 ⁇ 8 of the cassette 10 ⁇ 7 comprises a cylindrical central crown 31 on which is fixed, on either side by snap-fastening, a flange 32, 33, each flange comprising one of the raceways 116, 117.
  • the flange 33 forms the cover 119 which is offset in the axial direction relative to the edge used for snap-fastening on the crown 31.
  • the flange 32 located on the side of the drive motor 10 ⁇ 6 has a substantially frustoconical border 34 whose diameter increases in the direction of the motor 10 ⁇ 6.
  • This border 34 ensures the attachment of the housing and the cassette 10 ⁇ 7 on the housing of the drive motor 10 ⁇ 6 by cooperation of said border 34 with teeth 35 provided on the entire periphery of a ring gear 36 connected to the housing of the 10 ⁇ 6 engine.
  • the teeth 35 protrude radially with respect to the mean plane of the crown, as visible in FIG. 7 and are regularly distributed over the entire circumference as visible in FIG. 8.
  • a space 37 separates two successive teeth.
  • Each tooth 35 has a certain elasticity in the radial direction, in particular by bending at its root, to allow the crossing of the large diameter end of the edge 34 and the gripping of the frustoconical surface of said edge.
  • the ramp effect created by the inclined surfaces of the teeth and of the edge 34 makes it possible to apply with axial pressure the part of the flange 32 facing the zone of the crown 36 located inside, in the radial direction, teeth 35.
  • the crown 36 constitutes a particularly simple and advantageous cassette holder, allowing the cassette to be put in place with one hand, without having to impose a particular orientation. predetermined cassette 10 ⁇ 7 relative to the motor housing 10 ⁇ 6.
  • the drive member 10 ⁇ 5 is constituted by a shaft engaged internally between the tubular satellites 10 ⁇ 4.
  • FIG. 9 represents a variant embodiment, the elements playing roles identical to elements already described with respect to FIGS. 1 to 6 are designated by numerical references equal to the sum of the number 20 ⁇ 0 ⁇ and the reference used in these FIGS. 1 to 6.
  • the housing 20 ⁇ 8 has an inner groove 37 of concave section, facing the axis of the housing, in which is housed the deformable tube 20 ⁇ 2.
  • the satellites 20 ⁇ 9 have an outer barrel shape 38, with convex curvature combined with the concave curvature 37 of the groove of the housing.
  • the satellites 20 ⁇ 9 comprise, on either side of the barrel zone 38, a cylindrical zone 39, 40 ⁇ suitable for rolling on the associated raceway 216, 217.
  • the satellites 20 ⁇ 4 may comprise a cylindrical interior housing to allow the entry of planets similar to those shown in Figure 1.
  • the housing 20 ⁇ 8 of FIG. 9, with concave internal profile, allows self-centering of the tube and the satellites 20 ⁇ 9 so that it is practically no longer necessary to provide shoulders on either side of the satellites to maintain them in the axial direction. This results in a significant reduction in the wear of the satellites, and a longer service life of the cassette. The heating is also reduced.
  • the tightness produced by the crushing of the tube 20 ⁇ 2 between the concave surface 37 and the convex surface 38 of the roller is better, especially at the commissure. This allows higher pump discharge pressures and energy savings for the same flow rate.
  • the cassette and the pump according to the invention have numerous advantages.
  • the operation of the pump is silent and its assembly is easy during mass production.
  • the low manufacturing cost and the ease of assembly allowing the use of disposable cassettes in particular for medical applications.
  • the pump body has maximum endurance while the manufacturing tolerances remain easy to hold with raw plastic molding parts.
  • a minimum number of parts are in motion with reduced friction and dynamically balanced stresses providing excellent mechanical efficiency, and offering the possibility of using low-power, less expensive and more reliable motors. Maximum natural ventilation occurs during operation, which prevents overheating.
  • the tubular satellites 9, as already indicated, can be obtained economically by cutting extruded tube, which avoids an expensive production mold.
  • the tube 2 is closed, by crushing, in at least two places.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • External Artificial Organs (AREA)

Claims (7)

  1. Kassette für eine peristaltische Pumpe mit quetschbarem Schlauch, bestehend aus einem Gehäuse, das in der Nähe jedes seiner Enden eine zylinderische Lauffläche aufweist, gegen welche mittels eines Motors antreibbare rohrförmige Satellitenräder in Anlage bringbar und darauf abrollbar sind, welche den zwischen den beiden Laufflächen liegenden quetschbaren Schlauch quetschen, dadurch gekennzeichnet, daß die die Satellitenräder (9, 109, 209) im Inneren des Gehäuses (8, 108, 208) innerhalb des Bogens des quetschbaren Schlauchs frei angeordnet sind, wobei dieses Gehäuse zumindest auf einer Seite eine zentrale Öffnung (13, 113, 213) mit einem Durchmesser aufweist, der ausreicht, um den Antrieb der Stallitenräder entweder direkt von einer Drehscheibe (5) aus zu gestatten, die mit Planetenrädern (22) versehen ist, welche in die rohrförmigen Satellitenräder eingreifen, oder von einer Welle (105) aus, welche innen zwischen die Satellitenräder eingreift, und daß bei Trennung vom Motor die Satellitenräder (9, 109, 209) unter dem Druck des Schlauchs (23, 102, 202) zur Mitte hin zurückgeführt werden, wobei dieser Schlauch im Ruhezustand offen bleibt, wodurch eine vereinfachte vollständige Sterilisierung möglich wird.
  2. Kassette nach Anspruch 1, dadurch gekennzeichnet, daß das Gehäuse (208) eine innere Auskehlung (37) mit konkavem Querschnitt aufweist, in welcher der quetschbare Schlauch (202) zu liegen kommt, während die Satellitenräder (209) eine faßförmige Außenform (38) mit konvexer Krümmung aufweisen, die in Verbindung mit der konkaven Krümmung der Auskehlung (37) des Gehäuses dazu dient, gegen den quetschbaren Schlauch zu drücken, wobei jedes Satellitenrad (209) beiderseits des faßförmigen Bereichs einen zylindrischen Abschnitt (39, 40) aufweist, der auf einer zugerodneten Lauffläche (216, 217) abrollbar ist, und wobei das konkave Profil (37) des Gehäuse eine Selbstzentrierung des Schlauchs und der Satellitenräder gewährleistet.
  3. Kassette nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Gehäsue (108) einen zylindrischen Ring (31) in der Mitte aufweist, auf welchem, insbesondere duch gegenseitiges Verrasten, Flansche (32, 33) befestigt sind, von denen jeder eine inneliegende Lauffläche (116, 117) aufweist, wobei der auf der Seite des Antriebsmotors (106) liegende Flansch (32) einen im wesentlichen kegelstumpfförmigen Rand (34) aufweist, welcher durch Zusammenwirken mit über den gesamten Umfang eines mit einem Gehäuse für den Antriebsmotor verbundenen Zahnkranzes (36) vorgesehenen Zähnen (35) ermöglicht, die Befestigung des Gehäuses (108) auf dem Motorgehäuse zu gewährleisten.
  4. Kassette nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die rohrförmige Satellitenräder (9, 109, 209) aus einem elastischen Kunststoff gefertigt sind.
  5. Peristaltische Pumpe mit einer Kassette nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie einen Motor aufweist, dessen Abtriebswelle mit einer Scheibe (24) versehen ist, welche Achsen (23) trägt, auf welchen Rollkörper (22) beweglich angeordnet sind, welche mit den rohrförmigen Satellitenrädern in Inneneingriff bringbar sind, wobei die Scheibe (24) insbsondere eine Achse (28) aufweist, welche in der Verlängerung der Motorwelle liegt und auf welcher ein mittlerer Rollkörper (27) mit einem vergleichsweise erheblichen Selbstzentrierspiel beweglich angeordnet ist.
  6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, daß das Gehäuse (8) der Kassette auf der dem Motor gegenüberliegenden Seite mit einem aufgesetzten Deckel (19) verschlossen ist, wobei eine (17) der Laufflächen für die Satellitenräder (9) auf der Innenseite dieses Deckels (19) vorgesehen ist.
  7. Pumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Scheibe (24) vier Rollkörper (22) und einen mittleren Rollkörper (27) aufweist.
EP90400644A 1989-03-13 1990-03-12 Kassette für eine peristaltische Pumpe mit quetschbarem Schlauch und peristaltische Pumpe mit einer solchen Kassette Expired - Lifetime EP0388269B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903234A FR2644212B1 (fr) 1989-03-13 1989-03-13 Cassette pour pompe peristaltique a tube deformable, et pompe peristaltique equipee d'une telle cassette
FR8903234 1989-03-13

Publications (2)

Publication Number Publication Date
EP0388269A1 EP0388269A1 (de) 1990-09-19
EP0388269B1 true EP0388269B1 (de) 1994-01-26

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ID=9379609

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Application Number Title Priority Date Filing Date
EP90400644A Expired - Lifetime EP0388269B1 (de) 1989-03-13 1990-03-12 Kassette für eine peristaltische Pumpe mit quetschbarem Schlauch und peristaltische Pumpe mit einer solchen Kassette

Country Status (21)

Country Link
US (1) US5044902A (de)
EP (1) EP0388269B1 (de)
JP (1) JPH07122434B2 (de)
KR (1) KR0148344B1 (de)
CN (1) CN1019843B (de)
AT (1) ATE100903T1 (de)
AU (1) AU627282B2 (de)
BR (1) BR9005772A (de)
CA (1) CA2011988C (de)
DD (1) DD294065A5 (de)
DE (1) DE69006239T2 (de)
DK (1) DK0388269T3 (de)
ES (1) ES2048451T3 (de)
FR (1) FR2644212B1 (de)
IE (1) IE64115B1 (de)
IL (1) IL93713A (de)
NZ (1) NZ232882A (de)
PT (1) PT93423B (de)
RU (1) RU1836587C (de)
WO (1) WO1990010792A1 (de)
ZA (1) ZA901920B (de)

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IE900874L (en) 1990-09-13
AU627282B2 (en) 1992-08-20
RU1836587C (ru) 1993-08-23
IL93713A (en) 1993-08-18
PT93423B (pt) 1996-05-31
IE64115B1 (en) 1995-07-12
EP0388269A1 (de) 1990-09-19
IL93713A0 (en) 1990-12-23
DK0388269T3 (da) 1994-02-28
CN1019843B (zh) 1992-12-30
CA2011988C (fr) 1999-07-06
NZ232882A (en) 1992-11-25
KR920700351A (ko) 1992-02-19
WO1990010792A1 (fr) 1990-09-20
BR9005772A (pt) 1991-08-06
FR2644212A1 (fr) 1990-09-14
ES2048451T3 (es) 1994-03-16
FR2644212B1 (fr) 1991-11-15
DE69006239D1 (de) 1994-03-10
PT93423A (pt) 1991-10-31
ZA901920B (en) 1990-12-28
CA2011988A1 (fr) 1990-09-13
CN1045634A (zh) 1990-09-26
US5044902A (en) 1991-09-03
AU5120690A (en) 1990-09-13
DD294065A5 (de) 1991-09-19
KR0148344B1 (ko) 1999-03-20
ATE100903T1 (de) 1994-02-15
JPH0331593A (ja) 1991-02-12
DE69006239T2 (de) 1994-07-14
JPH07122434B2 (ja) 1995-12-25

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