Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
• • 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
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1284—Means for pushing the backing-plate against the tubular flexible member
• • 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
• • 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
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Definitions

• Peristaltic pump cassette comprising a device for adjusting the nip of the tube.
• the invention relates to peristaltic pumps.
• Peristaltic pumps have been known for many years and are widely used especially in medicine and research laboratories. They have the characteristic of causing the displacement of a liquid through a tube without a piece of the pump comes into contact with the liquid. It therefore becomes possible to pump liquids sensitive to external contamination such as blood.
• the pump comprises rotating rollers that move by locally crushing the flexible tube, causing the liquid to move within the flexible tube.
• the pump of the aforementioned document comprises removable cassettes each comprising a tube and a movable cam sliding which urges the tube against the rollers to ensure good contact thereof with the tube.
• the pump comprises means for adjusting the intensity of the clamping exerted by the cam on the tube.
• These means comprise two sliders movable inside the cassette so as to solicit the cam by corner effect.
• Each of the sliders is engaged with a threaded portion of a rod whose rotation can be controlled from the outside by a button.
• a disadvantage of this arrangement is that the adjustment of the clamping means is relatively long when it is necessary to change the clamping intensity over a large amplitude.
• An object of the invention is to facilitate and in particular to accelerate the use of the clamping means.
• a cassette for a peristaltic pump comprising a clamping adjustment member, immobilized by connection with a part of the cassette, the connection being disengageable to move the member during a tightening intensity adjustment.
• the cassette according to the invention may also have at least one of the following characteristics:
• the bond is a form-complementary bond
• the link is a notched link
• connection is disengageable by bearing on the body
• the member is accessible from outside the cassette and preferably extends outside the cassette;
• the member extends in projection from an upper face of the cassette
• a peristaltic pump comprising a clamping adjustment member Immobilized by connection with a pump part, the connection being disengageable to move the member during adjustment of the clamping intensity.
• FIG. 1 is a perspective view of a peristaltic pump head and a cassette according to a preferred embodiment of the invention, the cassette being disassembled;
• FIG. 2 is a view similar to Figure 1 showing the cassette mounted on the head;
• FIG. 3 is an axial sectional view of the pump head with the cassette of FIG. 2;
• FIG. 4 is an elevational view of the cassette of FIG. 1 with certain hidden portions illustrated in broken lines; and
• FIG. 5 is a perspective view of the cassette of FIG. 1.
• FIGS. 1 to 5 illustrate a peristaltic pump head with a cassette according to a preferred embodiment of the invention.
• the head 2 comprises a housing 4 having a main axis of symmetry 6.
• the head comprises a set of rollers 8 which are in this case eight in number.
• the rollers are arranged symmetrically about the axis 6.
• the rollers are rotatably mounted on a central support 10.
• Each of the rollers has in this case a cylindrical shape, the axis of each roll being parallel to the main axis 6.
• the pump comprises means not illustrated and known in themselves for rotating the support 10 about the axis 6.
• the housing 4 comprises two main front walls 12 and rear 14 defining between them a housing 16 for the reception of several cassettes 18 such as that shown in Figure 1.
• the cassettes can be received in the housing 16 as shown in Figure 2.
• the walls 12 and 14 are connected to one another by two rods 20 extending parallel to the axis 6 and serving as support and locking means to each of the cassettes 18, in cooperation therewith.
• Each cassette has a substantially flat shape and thus extends in a plane perpendicular to the axis 6.
• each cassette comprises a body 22 and a flexible tube 24 removably mounted in the body 22 by passing in particular through notches 25 of the latter.
• the body is substantially U-shaped in shape and comprises an elongated apex forming a cross-member 26 having two ends from which two arms 28 descend. notches 25 are formed in the vicinity of the lower ends of the arms 28. These same ends constitute the means for fixing and locking the cassette 18 to the head 2.
• a cavity 30 is formed facing the crosspiece 26, between the arms 28.
• the cassette 18 comprises a cam 32 received in the cavity 30.
• the cam 32 has a substantially flat rectangular shape with a recess in the shape of a hump in its lower face 34 intended to face the rollers 8.
• the tube 24 abuts against this edge 34 of the cam.
• the portion of the tube bearing against this edge is that which extends between the portions of the tube housed in the notches 25.
• the cassette has two walls 36 front and rear each extending from one to the other of the arms 28. to partially cover each face of the cam 32.
• the cassette 18 includes a leaf spring 38.
• a medial portion of the spring extends in the vicinity of the central portion of the cross member 26
• the end portions of the spring are fixed to the cam 32 by means of hooks 40 extending for this purpose projecting from an upper edge 41 of the cam.
• the flexible tube was removed for clarity in Figures 4 and 5.
• Days 42 formed in the walls 36 show on each side of the cassette the ends of the spring 38.
• the cassette 18 comprises a slider 50 in the general shape of a rectangular parallelepiped.
• the slide 50 is in contact by its lower face with the upper face of the central zone of the spring 38. Preferably, it is fixed to this face.
• the slide is slidably mounted in two grooves 52 formed respectively in the front and rear faces of the crosspiece 26 and extending facing one another. The middle portion of the slider is not housed in the grooves.
• the grooves extend in the vertical direction to allow the slide to move vertically.
• the median zone of the crosspiece 26 comprises facing grooves 52 a recess 54 receiving a control member which is here constituted by a slider 56.
• the recess 54 extends upwardly through a chimney extending to the upper face of the cross member 26 forming therein an orifice through which extends a finger 60 of the slider protruding from the upper side.
• the cavity 54 On either side of the base of the chimney, the cavity 54 has an upper face 55 oriented downwards and having a notch constituted by a succession of teeth.
• the slider 56 has an upper face 57 on either side of the finger 60, provided with a complementary shaped detent. In this way, this face 57 can engage with the upper face 55 of the crosspiece 26 to immobilize the slider 60 by complementarity of shape, that is to say by engaging the notches of the slider with the notches from the crossing 26.
• the slider has a lower face 62 inclined to give the cursor a configuration and a corner function. This face comes into contact with the upper face of the slider 50 in order to urge it downwards, that is to say in the direction of the tube 24.
• the spring 38 therefore has the function of tending to move away one of the other the cursor 56 and the cam 32 by respectively urging the cursor up and the cam down. As for the cam, it is blocked down by the flexible tube. In other words, the slider 56 is resting on the slider 50, which presses the spring 38, which urges the cam 32 downwards, which in turn allows the tube to be urged towards the rollers 8.
• the slider 56 makes it possible to adjust the clamping force of the cam on the tube. At rest, the slider 56 is immobilized thanks to the notched connection by complementarity of shape with the crossbar 26. To modify the intensity of the clamping of the tube exerted by the cam, a downward pressure is exerted on the finger 60, which has the effect of disengaging the connection between the upper face of the slider and the upper face of the crossbar 26. In other words, the form of complementarity connection is interrupted. The slider can thus be operated to the left or to the right by holding it by the finger 60.
• the tightening will be less intense if you move the cursor to the right and will be more intense if you move the cursor to the left.
• just release the slider which, biased by the spring, recovers in the desired position with the upper face of the crossbar 26.
• This system makes it possible to adjust the clamping force of the tube 24, for example as a function of the diameter thereof, in order to optimize the flow-pressure torque as well as the screw life of the tubes. It is also possible by this means to take into account certain characteristics of the liquid carried in the tube.
• the displacement of the slider makes it possible to vary the crushing of the spring, and thus by interaction the gripping force of the tube via the cam. Maintaining the cursor in the rest position is ensured by the notches operating by complementarity of form. Thanks to the direct movement of the cursor, the intensity of the wedge clamping can be varied quickly and easily.
• Marks may be indicated on the upper face of the cassette to mark different positions of the cursor corresponding to predetermined clamping intensities. It will thus be possible to provide a graduation for adjusting the clamping intensity. This graduation may be a function, for example, of the diameter of the tube used.
• the invention optimizes the nip for better performance and longer life of the tube.
• the invention facilitates the repeatability of the adjustment, that is to say the ability to reproduce at different times the same clamping intensity.
• the presence of the neck 60 or intermediate piece avoids the transmission of lateral forces between the slider and the cam.
• the form-complementary connection can be constituted by means other than a notch. It may be for example a wave shape. It can further be provided that the disengagement of the connection is by means other than a support on the cursor.
• the cassette may be without springs. Thus, it can be provided that the cursor comes directly in contact with the cam.
• the invention can be implemented in a peristaltic pump without a removable cassette.
• the adjustment member may be a rotary member, for example cooperating with a screw-nut connection.
• adjustment member may be provided to arrange the adjustment member so that it is accessible in the upper part of the cassette regardless of the disengageable nature of the link associated with this body.

Landscapes

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

Priority Applications (8)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=34947371

Family Applications (1)

Country Status (15)

Cited By (3)

Families Citing this family (38)

Citations (5)

Family Cites Families (12)

• 2004
  • 2004-06-22 FR FR0406764A patent/FR2871857B1/fr not_active Expired - Fee Related
• 2005
  • 2005-06-17 DE DE602005004665T patent/DE602005004665T2/de not_active Expired - Fee Related
  • 2005-06-17 ES ES05778710T patent/ES2301046T3/es not_active Expired - Lifetime
  • 2005-06-17 CN CNA2005800208193A patent/CN1973132A/zh active Pending
  • 2005-06-17 EP EP05778710A patent/EP1771662B1/fr not_active Expired - Lifetime
  • 2005-06-17 CA CA002571734A patent/CA2571734A1/en not_active Abandoned
  • 2005-06-17 RU RU2006144289/06A patent/RU2006144289A/ru not_active Application Discontinuation
  • 2005-06-17 DK DK05778710T patent/DK1771662T3/da active
  • 2005-06-17 JP JP2007517351A patent/JP2008503688A/ja active Pending
  • 2005-06-17 KR KR1020077001389A patent/KR20070033003A/ko not_active Withdrawn
  • 2005-06-17 WO PCT/FR2005/001524 patent/WO2006008376A1/fr not_active Ceased
  • 2005-06-17 PL PL05778710T patent/PL1771662T3/pl unknown
  • 2005-06-17 AT AT05778710T patent/ATE385543T1/de not_active IP Right Cessation
  • 2005-06-21 TW TW094120642A patent/TW200606339A/zh unknown
• 2006
  • 2006-12-18 US US11/612,011 patent/US20070217932A1/en not_active Abandoned

Patent Citations (5)

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