EP0484717B1 - Schlauchpumpe - Google Patents

Schlauchpumpe Download PDF

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Publication number
EP0484717B1
EP0484717B1 EP91117858A EP91117858A EP0484717B1 EP 0484717 B1 EP0484717 B1 EP 0484717B1 EP 91117858 A EP91117858 A EP 91117858A EP 91117858 A EP91117858 A EP 91117858A EP 0484717 B1 EP0484717 B1 EP 0484717B1
Authority
EP
European Patent Office
Prior art keywords
hose
pump
slide
slides
return stroke
Prior art date
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
Application number
EP91117858A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0484717A1 (de
Inventor
Hans Gerlach
Reinhard Knuth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
B Braun Melsungen AG
Original Assignee
B Braun Melsungen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by B Braun Melsungen AG filed Critical B Braun Melsungen AG
Publication of EP0484717A1 publication Critical patent/EP0484717A1/de
Application granted granted Critical
Publication of EP0484717B1 publication Critical patent/EP0484717B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/082—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Definitions

  • the invention relates to a hose pump of the type specified in the preamble of claim 1.
  • linear peristaltic pumps are often used as infusion pumps to deliver liquid from a reservoir to a patient's body.
  • the peristaltic pump has a tube that is inserted into the pump housing as an inexpensive, sterile, disposable item.
  • the hose is pressed off by a squeezing device, which has numerous sliders driven by a camshaft, which act cyclically on the pump hose in different phases and squeeze it out.
  • the hose has a resilience so that it widens again at this point when a slide is withdrawn.
  • a problem with such peristaltic pumps is that they cause a retraction phase in the medium on the return stroke of the last slide. This effect is caused by the fact that after the last slide is withdrawn, the inner volume of the hose that is now free is greater than the volume of media that has been added at this point in time. The widening hose creates suction and thus backflow. This withdrawal is particularly disadvantageous in the case of low delivery rates and increased back pressure, since there is a clear return delivery for a certain period of time. In the case of medical peristaltic pumps, this return delivery can have fatal consequences because blood can be drawn into the cannula through which the medication is to be delivered to the patient.
  • DE 31 04 873 A1 describes a device with which pulsations can be prevented in a peristaltic pump.
  • this device in addition to the pump slides, there are two further slides driven by the camshaft, the drive cams of which differ from those of the other slides.
  • the additional spools are controlled to produce an out-of-phase pulsation and build up pressure at times when the normal spools would cause reflux.
  • the media pressures, which are generated by the normal pump slide and the additional slide complement each other in such a way that an almost constant delivery pressure is achieved.
  • it is disadvantageous that a considerable amount of additional components is required, that the pump is enlarged in its structural dimensions and that there is also increased friction.
  • a finger pump is known from US Pat. No. 4,952,124, with which the problem of backflow is to be avoided or reduced by controlling at least two of the fingers provided in the central region of the pump length in such a way that the effective area becomes wider than the other fingers. This complicates the mechanical structure of the pump or requires a larger number of fingers.
  • additional slides are provided as gate valves.
  • the invention has for its object to provide a simple, effective and the pumping system not hindering or stressful measure to reduce the pulsation or withdrawal in a peristaltic pump.
  • the last slide in the conveying direction is controlled in such a way that it keeps the hose partially compressed even in the retracted state. While the remaining slides release the hose in the retracted position, so that the hose cross section can at least approximately return to the original state, the last slider is only between the closed position and a partial open position of the hose moved. The return stroke of the slide takes place only to such an extent that the hose cross section is opened to such an extent that there are no aerodynamic disadvantages. Because the last slide is only partially retracted, the volume released when the pump cycle begins again at the end of the pump area of the hose is reduced. The ratio between the volume released and the volume conveyed per unit of time is significantly reduced, ie improved, by this measure.
  • the delivery volume per pump cycle is not affected by the narrowing of the pump hose.
  • the delivery volume of the pump is defined during the time in which the first and the last slide compress the hose (at the same time). The volume in the hose is then driven forward and conveyed.
  • a return stroke limiting device which advantageously consists of a stop fixed to the housing, acts on the last slide.
  • Another advantage is that the control cam of the last slide can be designed in the same way as the control cam of the other slides. Of course, all of the camshaft control cams must be circumferentially offset from one another.
  • the peristaltic pump can therefore generally be constructed with the components of conventional peristaltic pumps, only a slot possibly having to be provided in the last slide, which allows the associated control cam of the camshaft to continue to rotate while this slide is held by the stop forming the return stroke limiting device .
  • the peristaltic pump 10 is mounted in a recess 12 in a front housing wall 11 of the housing of an infusion device. It consists of the rigid frame 13 with the counter bearing 14, the squeezing device 15 and the pressing device 16.
  • the frame 13 has a base part 17 and four rods 18 projecting therefrom.
  • the counter bearing 14 is attached via a joint, which is designed as a hinged door and can be attached to the other two rods 18 with a quick release.
  • a drive motor (not shown), which is fastened to the pump housing 21, drives via a reduction gear the camshaft 22 mounted in the pump housing 21.
  • the camshaft 22 consists of a shaft 23 with a hexagonal profile and cam disks 24 seated on this shaft, each of which has a hexagonal opening and thereby sits on the shaft 23 in a rotationally fixed manner.
  • Two cam disks 24 each form a double cam disk. Adjacent cam disks are circumferentially offset from one another by 30 ° on the shaft 23 and have an eccentricity of 2.5 mm, which results in a stroke of 5 mm with a full rotation of the cam disk.
  • Each of the cam disks 24 drives a slide 25.
  • the slides are guided in the pump housing 27 so that they can be moved longitudinally in lateral grooves and they run through slots 26 in the wall of the pump housing facing the counter bearing 14, a thickened head 27 being arranged at the end of each slide 25 .
  • the bearing play of the guide grooves for the slider 25 is selected so that the heads of adjacent slides just touch, but that tolerances of the slider or the heads do not add up.
  • the heads 27 of the slide are covered by a membrane 28 which is attached to the pump housing 21.
  • the pump housing 21 also has flanges 29 with which it is fastened to the housing wall 11 of the device housing.
  • the pump housing 21 is guided with sliding bushes along the rods 18, so that the frame 13 relative to the pump housing 21 or the crimping device 15 in Longitudinal direction of the rods can be moved.
  • the counter bearing 14 When the counter bearing 14 is in the closed position, it is a rigid component of the frame 13 and can be moved horizontally with the latter relative to the housing wall 11 or to the crimping device 15 fastened therein.
  • a spring device 33 consisting of at least one compression spring is supported on the rear side of the pump housing 21.
  • the spring device 33 is contained in a tube 34 which is connected to the pump housing 21 and which telescopically plunges into a tube 35 projecting rearward from the base part 17.
  • At the end of the tube 35 there is an adjusting device 36, which engages with a thread in an internal thread 37 of the tube 35 and presses with its end against the spring device 33.
  • the spring force of the pressing device 16 can be changed by rotating the adjusting device 36.
  • the spring device 33 engages centrally on the base part 17 and on the squeezing device 15, i.e. along the central axis of the crimping device.
  • a slider 38 is provided, which enables low-friction sliding of the two tubes 34 and 35 and which, together with the sliding bushes 32, ensures that the frame 13 is guided in a linearly displaceable manner without tilting relative to the squeezing device 15.
  • the hose 40 which runs vertically between the membrane 28 and the counterbearing 14, is squeezed out at least in every phase of the rotation of the camshaft 22 by at least one slide 25. Any tolerances of the pump and / or hose are compensated for by the pressing device 16, which causes the frame 13 together with the thrust bearing 14 against the squeezing device by the spring device 33 15, and thus driven against the slide 25.
  • a push button 39 is slidably arranged on the pump housing 21, which pushes against the membrane 28 and against the outlet region of the pump hose.
  • the push button 39 is coupled to a sensor (not shown) which detects the position of the push button 39 and thereby determines the output pressure of the pump.
  • the camshaft 22 controls the slide 25 so that the hose 40 is continuously compressed and squeezed by the heads 27, the compression progressing in the conveying direction, that is to say from right to left in the drawings of this exemplary embodiment.
  • the sliders act on the pumping area of the tubing in a section that encompasses 360 ° of the pumping cycle, i.e. the first and the last slide are controlled in phase.
  • Fig. 3 the state is shown that the first in the conveying direction and the last in the conveying direction slide 25 are both in the outermost advanced state.
  • the intermediate slides 25 are withdrawn to a greater or lesser extent, so that the volume V F enclosed in this area by the hose 40 represents the delivery volume which is enclosed on all sides at this moment and which is advanced in the delivery direction.
  • the heads 27 In the retracted position of the slide, the heads 27 assume a position which enables the hose to assume the undeformed (round) state.
  • the hose itself has its own resilience.
  • the last slide 25a in the conveying direction is generally designed in the same way as the other slides 25 and the cam disk 24a controlling it has the same shape as the other cam disks 24. It is different that a return stroke limiting device is provided which does not allow the slide 25a, withdraw as far as the other slides 25.
  • This return stroke limiting device consists of a stop 42 which is provided on the housing 21 and against which the head 27a of the slider 25a abuts during the retraction movement. This stop 42 is arranged so that the slider 25a in the extreme retracted position, that is, when its head 27a abuts the stop 42, takes up half the hose diameter (or a little more), as can be seen from FIG. 4.
  • the tube volume V 1 is also shown hatched, which is excluded from the release during the retraction movement of the slide 25 a and which contributes to the reduction or elimination of the back suction. If the slide 25a were to move back as far as the other slides, then the hose widening in this area would cause a backward suction.
  • a gap 43 is provided in the slide 25a, in which the cam disk 24a moves and which permits a longitudinal movement of the cam disk 24a with respect to the slide 25a. This achieves the required play of the camshaft in relation to the slide 25a.
  • the slide 25a is designed in the same way as the slide 25 and the cam disk 24a is designed in the same way as the cam disks 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • External Artificial Organs (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP91117858A 1990-11-06 1991-10-19 Schlauchpumpe Expired - Lifetime EP0484717B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4035182A DE4035182C1 (enExample) 1990-11-06 1990-11-06
DE4035182 1990-11-06

Publications (2)

Publication Number Publication Date
EP0484717A1 EP0484717A1 (de) 1992-05-13
EP0484717B1 true EP0484717B1 (de) 1994-09-07

Family

ID=6417698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117858A Expired - Lifetime EP0484717B1 (de) 1990-11-06 1991-10-19 Schlauchpumpe

Country Status (3)

Country Link
EP (1) EP0484717B1 (enExample)
AT (1) ATE111189T1 (enExample)
DE (2) DE4035182C1 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4310332A1 (de) 2022-07-21 2024-01-24 B. Braun Melsungen AG Verdrängereinheit für eine medizinische schlauchpumpe und medizinische schlauchpumpe
EP4592529A1 (de) 2024-01-29 2025-07-30 B. Braun Melsungen AG Medizinische schlauchpumpe

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1001179B (el) * 1992-03-10 1993-06-07 Micrel Kentron Efarmogon Mikro Φορητη γραμμικη μερισταλτικη αντλια.
DE29706606U1 (de) 1997-04-12 1997-08-21 Kammerer, Rolf, 75196 Remchingen Rotationsverdrängerpumpe
DE20210502U1 (de) 2002-07-06 2003-11-20 B. Braun Melsungen Ag, 34212 Melsungen Peristaltische Schlauchpumpe
FR2908165A1 (fr) 2006-11-08 2008-05-09 Fresenius Vial Soc Par Actions Procede de controle du debit d'une pompe peristaltique et pompe peristaltique
DE202009001865U1 (de) 2009-02-11 2010-07-22 Krauss, Gunter Pumpe, insbesondere Schlauchpumpe
US9163623B2 (en) 2011-12-08 2015-10-20 Carefusion 303, Inc. System and method for improved flow uniformity in a peristaltic pump mechanism
DE202018003997U1 (de) 2018-08-28 2019-12-04 Gunter Krauss Pumpe, insbesondere Schlauchpumpe
EP3757390A1 (de) * 2019-06-25 2020-12-30 maxon international ag Verfahren zur herstellung eines zweiteiligen quetschelements für eine peristaltikpumpe sowie zweiteiliges quetschelement für eine peristaltikpumpe
US12228124B2 (en) 2020-05-04 2025-02-18 The Board of Regents for the Oklahoma Agricultural and Mechanical Colleges Peristaltic compressor
CN113397721A (zh) * 2021-06-04 2021-09-17 河北卫勤医疗科技有限公司 一种实现生命支持暨急救功能的便携式多功能集成装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322201A (en) * 1979-03-09 1982-03-30 Avi, Inc. IV Pump with back pressure control
JPS56113084A (en) * 1980-02-12 1981-09-05 Terumo Corp Pulsation preventing method and device for peristaltic finger pump
JPS61228872A (ja) * 1985-04-01 1986-10-13 シャープ株式会社 薬液注入装置
US4781548A (en) * 1987-04-10 1988-11-01 Alderson Richard K Infusion pump system and conduit therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4310332A1 (de) 2022-07-21 2024-01-24 B. Braun Melsungen AG Verdrängereinheit für eine medizinische schlauchpumpe und medizinische schlauchpumpe
DE102022118250A1 (de) 2022-07-21 2024-02-01 B. Braun Melsungen Aktiengesellschaft Verdrängereinheit für eine medizinische Schlauchpumpe und medizinische Schlauchpumpe
EP4592529A1 (de) 2024-01-29 2025-07-30 B. Braun Melsungen AG Medizinische schlauchpumpe

Also Published As

Publication number Publication date
DE4035182C1 (enExample) 1992-01-02
EP0484717A1 (de) 1992-05-13
ATE111189T1 (de) 1994-09-15
DE59102830D1 (de) 1994-10-13

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