EP3324047B1 - Tube reception device of a roller pump - Google Patents

Description

The present invention relates to a peristaltic pump and more particularly to a tensioning device arranged in / on a hose receiving compartment of the hose or roller pump (squeeze pump) for applying a hose which can be inserted into the shaft, preferably of the one-way design.

Roller or hose (squeeze) pumps are positive displacement pumps in which the medium to be pumped is forced through it by elastic external mechanical deformation of a hose. Due to the gentle promotion of the medium (without this to shear or swirl) peristaltic pumps are used in particular for medical purposes.

In the housing of a generic peristaltic pump, a flexible / elastically deformable hose is in principle used so that it is guided around a rotatable pump head over a predetermined peripheral portion on which a number of angularly spaced rollers are rotatably mounted, with appropriate rotation of the pump head with the hose be sequentially grooved and squeezed / clamped. The hose is either supported on the outside of the pump housing or it is stretched with a predetermined tensile force around and against the pump head.

In any design, however, the movement of the pump head causes the respective Abklemmstelle a straight meshing roller along the tube moves forward, thereby driving the fluid within the roller directly ahead of the hose section. The generation of the intake negative pressure in the hose section directly following the relevant roller is generally generated by the inherent elasticity of the hose material, as a result of which the hose tries to regain its original design form.

Due to increasingly stringent hygiene regulations and more demanding user wishes, it has become customary to design at least those components of a peristaltic pump, especially in their medical use, as one-way articles which come into direct contact with the pumped medium. These include primarily the hose, which must therefore be as simple as possible to expand and use. For this purpose, a large number of hose units and tensioning devices are known from the prior art, of which a few are to be mentioned below:
In principle, it is possible to preassemble the hose and the pump head in a kind of cartridge as a separate hose unit, which only has to be inserted / locked in a replacement operation in the housing of the peristaltic pump, such that the pump head with a drive shaft such as an electric motor or one to this downstream gear rotatably engaged. Although this solution greatly simplifies the exchange process and at the same time ensures high reliability, since the cartridge is executable as a self-contained housing unit, whereby rotating elements are housed inaccessible from the outside, this represents a relatively expensive design variant.

The pump head is a rather complex component consisting of a plurality of relatively movable / rotating parts (as already indicated above), which actually would not have to be replaced because it is not contaminated directly from the fluid. Therefore, it is much cheaper to provide only the tube as a disposable item. For its replacement, however, the hose must be withdrawn from the pump head or reared, whereby a biasing force must be overcome, with which the hose is stretched around the pump head. In order to facilitate changing only the hose (with the pump head remaining), therefore, a special clamping mechanism has been developed by means of which the hose can be tensioned and tensioned for a change operation.

The G 94 11 183 discloses a simple construction of such a clamping device. Accordingly, the hose is provided with two axially spaced bead-like stops / brackets, whereas the pump housing within the hose receiving compartment formed or inserted therein is provided with a cross bar or beams as a hose seat in which two notches are formed. In order to use now the hose in the hose receiving, the one bead-shaped stop is engaged in the one notch / hooked and then pulled the hose around the pump head. Finally, the other bead-shaped stop is engaged / hooked in the other notch. This insertion process is very time consuming and complicated because the stops must be hooked under tension of the hose in the notches, which requires some skill and strength on the part of an operator.

Alternatively, it is also possible to provide a driving bar as a hose receiving, which is firmly connected at its two axial ends to the hose at two axially spaced hose sections, such that the hose (hose center section) forms a loop between the beam ends. The bar and hose form a separate, exchangeable hose unit.

The tube thus formed is now placed / guided with its loop area over the pump head and the driving bar locked in a jig. The tensioning device preferably provides a guide rail / groove for the driving bar, along which the driving bar is moved under tensioning of the loop area until it engages in a releasable holder / latching within the hose receiving compartment. Although this design facilitates the insertion process of the hose, however, the hose in the region of the loop must be stretched simultaneously at two ends of the loop area and thus on two with respect to the pump head forming flanks, which requires a greater effort, which are not applied by each operator can.

Finally, replacement of only the hose (and not the pump head) requires outside access to the rotating components as well either for cost reasons remains open during operation or at least partially closed by means of an additional service / protective flap. The latter not only increases the cost of the peristaltic pump, but also forms a source of danger in that the flap must be closed in an additional step, which can possibly be forgotten.

Further prior art is out DE 20 2011 051 141 U1 which discloses a medical peristaltic pump having a tube receiving compartment and a tube unit insertable therein, wherein a lever-type tensioning device is provided to transversely engage the tube unit with a pump head.

Furthermore, it is off US 2007/0020130 A1 a peristaltic pump is known, in which a hose is pressed by a partially elastic support, which is clamped with respect to the pump and the hose.

WO 2004/044425 A1 shows a peristaltic pump in which a hose between a curved wall and scooters is clamped by the wall is displaced by a lever.

In view of this problem, an object of the present invention is to provide a peristaltic pump of the present type which has increased functionality. One goal is to facilitate the insertion process for a hose or for a hose unit, in particular the one-way design. Another goal is to improve the safety of the peristaltic pump. Finally, it is an object of the invention to keep the peristaltic pump and in particular the flexible hose unit cost.

This above object and the other objects are achieved by the features of claim 1. Advantageous embodiments of the invention are the subject of at least the dependent claims.

A basic idea of the invention therefore consists in equipping the peristaltic pump with a hose receiving compartment, into which the hose can be inserted almost without tension. Furthermore, the peristaltic pump has a hose tensioning device with a preferably manually or electromotively operable lever mechanism to tension the hose over a predetermined peripheral portion around the rotating (fixed) pump head of the peristaltic pump. By the lever mechanism necessary to achieve the required clamping force and thus the contact pressure against the pump head operating force can be reduced so that they can be easily applied manually without additional separate tool would be required. In the case of a motorized actuation of the lever mechanism, the drive can be made small and thus cost-effective.

Basically, as a lever mechanisms a variety of structural configurations are conceivable, with the aid of an actuating movement with a corresponding reduction on the hose / the hose unit is transferable, such as a worm gear, a pulley a gear transmission or the like tools. Concretely, however, it is advantageous to form the lever mechanism conventionally in the form of an actuating element (handle) hinged to the hose pump, which is coupled (actively connected) to a sliding force-transmitting, displaceable component or plunger component which generates an actuation force generated by pivoting Depending on the type of coupling / place, it transfers to the handle at the handle in a stout manner to the hose. Such a concept for the lever mechanism is easy to produce, reliable and therefore economical.

Thus, according to one aspect of the invention, there is provided a medical peristaltic pump having a pump housing in which a tubing receptacle is formed or received, in which a pump head / pump rotor (preferably stationary) is rotatably accommodated and with a tubing unit so inserted into the tubing receptacle. is that a hose of the hose unit with the pump head in this at least partially spanning engagement comes or can be brought (under elastic longitudinal expansion of the hose).

The tension (also pulling force) with which the hose is to be applied or applied to the pump head is applied by a pull / tension device arranged on the pump housing (ie provided as a fixed component of the peristaltic pump) which interacts with the hose unit or the pump head. so that during their (manual / motor) actuation of the hose is clamped around the pump head. According to the invention, the clamping device has a permanently installed on the pump housing and thus not to be regarded as a tool lever mechanism.

Due to this design, a hose or a hose unit can be easily inserted and tensioned by each person. Also, the removal of a hose or hose unit is done simply by the bias of the hose around the pump head released via the lever mechanism and then removed the hose / hose unit from the hose receiving compartment virtually free of forces becomes. Since the lever mechanism is part of the peristaltic pump, this is not changed every time, so that the operation of the peristaltic pump remains inexpensive.

According to the invention, the hose unit is preferably formed as a replacement component accordingly from the flexible hose and a bar-like hose holder, which holds the hose at two hose - longitudinally spaced positions (to form a hose loop). Furthermore, the tensioning device arranged on the pump housing or on the hose receiving compartment is provided in the form of the lever mechanism for displacing preferably the hose holder (or the pump head) with at least one lever element (actuating element or plunger component as defined above), to which a clamping device or a an undercut forming latching device is provided which, upon reaching a hose tensioning position, engages a counterclamping / latching device disposed on the hose support of the (replaceable hose unit) for locking the hose support and the tensioning device into its hose tensioning position.

In other words, a lifting element (actuating element of the lever mechanism) is pivoted (preferably folded in the direction of the hose receiving compartment) for clamping the hose around the pump head. At the same time, this pivoting movement of the one lever element is converted by the entire lever mechanism into a displacement movement preferably of the hose holder (or of the pump head) in the hose tensioning direction. As soon as the lever element is completely folded over, the tube holder (or the pump head) is also displaced to the maximum and the tube is clamped at most around the pump head. In this position, the clamping / locking device comes on the part of the lever member with the counter clamping / - locking device on the part of the hose holder into engagement and prevents or prevents inadvertent pivoting of the lever element and / or a displacement of the hose holder (in the case of a fixed pump head) itself when the lever mechanism becomes defective at one point. This increases the safety of the peristaltic pump.

Preferably, a lever element of the lever mechanism at the same time also has a protective cap for the at least partial (front) cover of the tube receiving compartment. As a result, the hose receiving compartment is opened or closed at the same time (automatically) by pressing the tensioning device, thus protecting the moving parts therein, such as the pump head or the hose, from the outside. This also increases the safety of the peristaltic pump.

Another aspect of the invention may provide that the protective cap either forms or is fixed to the lever element, which is provided as a handle (actuating element) of the lever mechanism or forms or is fixed to the lever element (plunger element), which via the handle for transmitting leverage can be actuated on the hose holder. As already stated, the lever mechanism according to the invention has an actuating element or a handle which is directly or indirectly hinged to the pump housing and a plunger element, which is operatively connected to the lever for power transmission. The protective cap can therefore be assigned to either the handle or the plunger element.

In the event that the handle at the same time has or is the protective cap, this may have the shape of a cover plate. In the event that the power transmission lever member (plunger member) has or is the protective cap, the handle may be in the form of a bow handle, a buckle / operating button, a toggle lever or the like ergonomic shape. As a result, since the protective function and the actuating function are assigned to different elements of the lever mechanism, they can be optimally adapted to their remaining function without compromise.

According to another aspect of the invention, a hose receptacle (Einhängbauteil) may be preferably provided as part of the lever mechanism, which is slidably disposed or can be arranged in or on the hose receiving compartment and in which the hose via the formed or fixed thereto hose holder can be inserted or inserted /.

In the preferred case of the slidable tube retainer, it is advantageously provided that the lever mechanism preferably acts on the tube retainer as a further element of the lever mechanism to move relative to the stationary (non-displaceable) pump head (thereby carrying the tube retainer) such that the free (loop-shaped) hose center section abuts the pump head in a spanning manner. In this case, the tube center section in inserted, unstressed condition can also be almost straight or already pre-cut.

It can also be advantageous if the lever mechanism is designed to be self-locking in addition to the latching / mating latching device, i. when the handle pivots during their actuation to tension the hose over a kind of dead center and then almost automatically works / snaps into its end clamping position.

It is also possible to provide a stop or stop projection which is formed in the tube receiving compartment and presses against the tube holder (or the tube holder) upon reaching the tube clamping position in order to block its further displacement in the tube tensioning direction.

Finally, it is provided according to another aspect of the invention to provide a hose unit for a peristaltic pump according to the invention (separate from the hose pump according to the invention preferably designed as a one-way component) consisting of a bar-like hose holder (engagement device), which the flexible, preferably elastic hose holds on two axially spaced positions and is firmly connected to these positions with the hose and thereby forms at least one undercut, which can be brought into holding engagement with the hose receptacle of the peristaltic pump or the tensioning device of the peristaltic pump. As a result, the hose unit can be produced very inexpensively due to the few components and is therefore particularly suitable as a one-way item.

Furthermore, a transversely projecting tab is formed on the hose holder, which for manual handling of the hose assembly during installation / removal process and preferably adapted as a detent of the tensioning device / the lever mechanism in the hose - clamping position. This facilitates the handling of the hose unit. At the same time provided for locking the tensioning device counter-latching element (tab) is changed on the part of the hose unit with each replacement. As a result, the counter-locking element can be made from a low-cost material (together with the hose holder) as a one-way article, since no consideration has to be taken of its durability.

• Fig. 1 zeigt ein erstes bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit feststehender Schlauchaufnahme und bügelfömiger Handhabe in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand,
• Fig. 2 zeigt ein zweites bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit feststehender Schlauchaufnahme und schnallenförmiger Handhabe in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand,
• Fig. 3 zeigt ein drittes bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit feststehender Schlauchaufnahme und plattenförmiger Handhabe, in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand
• Fig. 4 zeigt ein viertes bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit feststehender Schlauchaufnahme und kniehebelförmiger Handhabe in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand,
• Fig. 5 zeigt ein fünftes bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit verschiebbarer/beweglicher Schlauchaufnahme und tastenförmiger Handhabe in ungespanntem und gespanntem Zustand,
• Fig. 6 zeigt ein sechstes bevorzugtes Ausführungsbeispiel der Erfindung mit einem manuell betätigbaren Hebelmechanismus als Spannvorrichtung mit verschiebbarer/beweglicher Schlauchaufnahme und plattenförmiger Handhabe in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand,
• Fig. 7 zeigt ein siebtes bevorzugtes Ausführungsbeispiel der Erfindung mit einem elektromotorisch betätigbaren Hebelmechanismus als Spannvorrichtung mit verschiebbarer/beweglicher Schlauchaufnahme und sowie einem Zahnradgetriebe als Hebelmechanismus zwischen Antriebsmotor und Schlauchaufnahme in offenem (ungespanntem) und geschlossenem (gespanntem) Zustand,
• Fig. 8 zeigt als ein illustratives Beispiel das Gehäuse einer erfindungsgemäßen Schlauchpumpe mit bügelförmiger Handhabe gemäß Fig. 1 und insbesondere das Schlauchaufnahmefach in offenem (ungespanntem) Zustand,
• Fig. 9 zeigt die konkrete Ausgestaltung des Hebelmechanismus gemäß der Erfindung vorliegend mit einem Klappenförmigen Hebelelement als Handhabe (Betätigungselement) sowie einem ortsfesten Pumpenrotor und verschiebbarer Schlauchaufnahme als Bestandteil des Hebelmechanismus und mit bereits eingelegter Schlaucheinheit in einer Perspektivendarstellung,
• Fig. 10 die Seitenansicht des Hebelmechanismus mit eingelegter Schlaucheinheit gemäß der Fig. 9 in Schlauch - Spannposition (bei geschlossener Front - Klappe),
• Fig. 11 zeigt die Draufsicht einer Separat gefertigten Schlaucheinheit gemäß der Erfindung (als Ein-Weg-Artikel) und
• Fig. 12 zeigt die Seitenansicht der Schlaucheinheit gemäß der Fig. 11.

The invention will be explained below with reference to a preferred embodiment with reference to the accompanying figures.

• Fig. 1 shows a first preferred embodiment of the invention with a manually operable lever mechanism as a clamping device with a fixed hose receiving and ironing handle in open (untensioned) and closed (cocked) state,
• Fig. 2 shows a second preferred embodiment of the invention with a manually operable lever mechanism as a clamping device with fixed hose receptacle and buckle-shaped handle in open (untensioned) and closed (cocked) state,
• Fig. 3 shows a third preferred embodiment of the invention with a manually operable lever mechanism as a clamping device with fixed hose receiving and plate-shaped handle, in open (untensioned) and closed (cocked) state
• Fig. 4 shows a fourth preferred embodiment of the invention with a manually operable lever mechanism as a clamping device with fixed hose receptacle and toggle-shaped handle in open (untensioned) and closed (cocked) state,
• Fig. 5 shows a fifth preferred embodiment of the invention with a manually operated lever mechanism as a tensioning device with displaceable / movable hose receiving and key-shaped handle in untensioned and tensioned state,
• Fig. 6 shows a sixth preferred embodiment of the invention with a manually operable lever mechanism as a clamping device with movable / movable hose receiving and plate-shaped handle in the open (untensioned) and closed (cocked) state,
• Fig. 7 shows a seventh preferred embodiment of the invention with an electromotive actuated lever mechanism as a clamping device with sliding / movable hose receptacle and a gear drive as a lever mechanism between the drive motor and hose receptacle in open (untensioned) and closed (cocked) state,
• Fig. 8 shows as an illustrative example, the housing of a hose pump according to the invention with bow-shaped handle according to Fig. 1 and in particular the hose receiving compartment in open (untensioned) condition,
• Fig. 9 shows the specific embodiment of the lever mechanism according to the present invention with a flap-shaped lever element as a handle (actuator) and a stationary pump rotor and displaceable hose receptacle as part of the lever mechanism and with already inserted hose unit in a perspective view,
• Fig. 10 the side view of the lever mechanism with inserted hose unit according to the Fig. 9 in hose clamping position (with front flap closed),
• Fig. 11 shows the top view of a separately manufactured hose unit according to the invention (as a one-way article) and
• Fig. 12 shows the side view of the hose unit according to the Fig. 11 ,

In the Fig. 1 is a hose receiving compartment 1 of a peristaltic pump according to the Fig. 8 shown in detail, which is equipped with a clamping device with lever mechanism 2. As here from the Fig. 8 can be seen, the hose pump of the invention has basically a pump housing 4, on the front side in this case, the tube receiving compartment 1 is arranged, such that it opens to the front of the pump housing 4 out. Within the hose receiving compartment 1 is a pump head 6 consisting of a motor-driven, rotatable drive wheel, on the radial outer circumference of a number of pressure wheels / rollers (not shown) are relatively rotatably mounted, which are distributed at equal circumferential distances from each other. A control panel 8, which is also placed on the front of the pump housing 4, serves to program a control at least for the electric drive of the pump head, for example, to adjust the speed or on and off times of the peristaltic pump. In addition, on and off buttons are arranged on the front side of the pump housing.

In the embodiment according to the Fig. 1 the tube receiving compartment 1 is formed in the form of a substantially rectangular shell or depression, which is either manufactured in one piece with the pump housing 4 or is used as a separate component in a corresponding section of the pump housing 4. At two opposite walls of the tube receiving compartment 1, a notch 12 are each prepared, which serve as a tube receptacles and in which a hose or a hose unit 14 can be used. The notches 12 are aligned with each other for this purpose, such that their alignment line arranged radially offset to the pump head 6.

On a side parallel to the line of flight of the tube receiving compartment 1, the clamping device with lever mechanism 2 is mounted on the pump housing 4. In the present case, this lever mechanism consists of a handle 16 hinged pivotably on the pump housing 4 in the form of a handle bar, which is operatively connected to a push element (plunger component) 18 via a joint (not shown), a spring device or a toothed gear. The pusher element 18 has in plan view according to of the Fig. 1 a substantially rectangular plate shape, the size of which is sufficient to cover the tube receiving compartment 1 as far as possible or even completely. The thrust element 18 is further connected to the axis of rotation of the pump head 6 and forms in the present case a bearing for the axis of rotation.

For example, the thrust element 18 may consist of two parallel spaced plates, which are fixed to each other and between which the pump head is rotatably supported. In this case, it is also advantageous if the drive motor for the pump head 6 (not further shown) is also attached to the pusher element 18. The thrust element 18 is displaceably guided on the pump housing 4 such that it can not be lifted off the pump housing 4. The mounting of the pump head 6 is further selected so that the pump head 6 projects beyond the thrust element 18 on the plate edge of the thrust element 18, which faces the alignment line.

From the Fig. 1 is also the hose unit 14 can be seen, which is provided according to the invention as a hose pump separate component and optionally in the hose receiving compartment 1 can be used.

The hose unit 14 therefore consists of a flexible, preferably elastically deformable (stretchable in the tube longitudinal direction) tube 20 to which two brackets or engagement elements 22 are attached or formed at an axial distance from each other, which represent a total of the hose holder of the hose unit. These brackets 22 form radial circumferential projections or collars, which can be brought into undercut engagement with the notches 12 on the hose receiving compartment 1. The axial spacing of the brackets 22 is selected so that when the tube 20 is inserted into the two notches 12 so that the brackets 22 engage the tubing receptacle 1 behind the notches 12, the mid-section tube 20a extending therebetween will not or only slightly stretched, which essentially follows the line of flight.

On the opposite with respect to the thrust element 18 side of the alignment line the tube receiving compartment 1 is partially covered with a fixed plate 24, wherein the fixed Plate 24 has an inner protrusion 24a, in which that part of the pump head 6, which protrudes from the plate-shaped thrust element 18 in the direction of alignment, dips when retracting the tube receiving compartment 1 and retracts.

The operation of the peristaltic pump according to the first preferred embodiment of the invention can be described with reference to Fig. 1 and 8th rewrite as follows.

According to the Fig. 1 , Right representation, the tube receiving compartment 1 is opened by the bow-shaped handle 16 according to the Fig. 1 is manually opened to the left, whereby the plate-shaped thrust element 18 together with the pump head 6 via the lever mechanism to the left, that is moved away from the alignment line. In this (open, unclamped) position, the hose unit 14 can now be inserted into the notches 12 as described above without any effort and thus easy.

Subsequently, the bow-shaped handle 16 is manually folded in the direction of alignment, this folding or pivoting movement is transmitted via the lever mechanism with a corresponding reduction on the plate-shaped thrust element 18 for its displacement. That is, with / by pivoting the handle 16 in the direction of line of flight, the plate-shaped thrust element 18 is pushed toward the fixed plate 24 forward, at the same time the rotatably mounted pump head 6 is pressed against the tube center portion 20a and advanced. Since the sliding path of the pusher 18 to hit with the fixed plate 24 is greater than the distance between the inserted tube 20 and the pump head 6 in the fully open state, the pump head 6 is thus pressed through the tube 20 quasi through, wherein the hose center section 20a between the brackets 22 / notches 12 around the pump head 6 is stretched over a partial circumference of this. In the fully closed state of the tube receiving compartment 1 according to the left illustration in Fig. 1 Accordingly, the hose center portion 20a is U-shaped elastically deformed, resulting in a predetermined application force between the pump head 6 and hose 20.

In the course of the pivotal movement of the handle 16 in the closing or clamping direction this exceeds a kind of dead center of the lever mechanism, whereupon the handle 16 by utilizing the already generated clamping force of the hose center portion 20 a on the pump head 6 in the direction of the end position of the handle (according to the left Presentation in Fig. 1 ) is forced. That is, the lever mechanism according to the first embodiment of the invention is equipped with a kind of self-locking, which holds the handle 16 automatically, without additional locking elements, in its tensioned end position.

The FIGS. 2 and 3 show alternative embodiments of the clamping device 2 according to the Fig. 1 , wherein only the technical differences to the first embodiment is to be discussed below, while all other technical features substantially correspond to the first embodiment.

The embodiments according to the FIGS. 2 and 3 differ from the first embodiment according to the Fig. 1 in the embodiment of the manually operable handle 16. According to the Fig. 2 the handle 16 is formed as a kind of strip-shaped buckle, whereas the plate-shaped pushing element 18 in the right-hand illustration in FIG Fig. 2 is formed on the upper side with a longitudinal groove 26 in the sliding direction of the thrust element 18, which faces the buckle 16. In this case, the fixed plate 24 is formed with a corresponding longitudinal groove 28 which is aligned with the longitudinal groove 26 in the thrust element 18.

The longitudinal groove (s) 24, 26 is (are) dimensioned so that the buckle 16 when folded in its exciting end position according to the left illustration in Fig. 2 into the groove (s) 24, 26 einschwenkt and almost completely absorbed therein. This results in a substantially smooth, edge-free top of the plate-shaped thrust element 18 and the fixed plate 24, so that a versehendliches opening the buckle 16, for example, as a result of it getting stuck is avoided. This contributes to the further improvement of the safety of the hose pump according to the invention.

Finally, the handle 16 according to the right representation in Fig. 3 also consist of a plate-shaped flap, which after folding in its tensioned end position (see left illustration in Fig. 3 the tube receiving compartment 1 is preferably completely covered, including the fixed plate 24.

The embodiment according to the Fig. 4 corresponds in principle to the embodiments described above, in which case, however, the handle 16 is in the form of a toggle lever. Specifically, the toggle lever 16 is hinged to the hose receiving compartment 1 or the pump housing 4, that extends the pivot axis perpendicular to the front side of the pump housing 4 and thus perpendicular to the top of the plate-shaped thrust element 18. The toggle lever 16 is formed with an eccentric or a cam 16a, which presses against the thrust element 18 when the lever 16 is turned and displaces it in the closing direction against the inserted tube 20. Since the toggle lever 16 has no coupling with the pusher member 18, but only applies against the rear edge 18 a, a not shown spring (-einrichtung) is provided, which the thrust element 18 in the opening direction (relaxed end position according to the right representation in FIG Fig. 4 ). The knee lever 16 is also positioned so that it reaches its tensioned end position (see left illustration in FIG Fig. 4 ) has exceeded a (top) dead center of the cam 16a and is thus automatically held in this position.

All embodiments according to the Fig. 1 to 4 have in common that the tube receptacle in the form of the two aligned notches 12 is stationary / arranged in the tube receiving compartment / shaft 1, whereby it is necessary for a tensioning of the tube 20, the pump head 6 slidable in the direction towards the hose unit 14 to store. However, in principle it is also possible to hold the pump head 6 stationary in the hose receiving compartment 1 and instead store the hose receptacle 12 displaceably in the hose receiving compartment 1. In this case, the tensioning device 2 does not have to act on the pump head 6, but on the hose receptacle 12. In the following, this principle of operation is based on the Fig. 5 to 7 described by way of example.

The Fig. 5 shows a fifth embodiment of the invention as a simple construction for implementing the aforementioned alternative clamping principle.

In this case, the pump head 6 is in accordance with Fig. 5 , Left view rotatably mounted in the hose receiving compartment 1 (stationary) and is driven by a motor not shown within the pump housing 4. The tube receiving compartment 1 is thereby guided around the pump head 6 in a semicircular shape, whereby a kind of U-shaped receiving shaft or groove 1 a is formed between the tube receiving compartment 1 and the pump head 6.

On the receiving shaft 1a radially opposite side of the pump head 6, a bar-shaped receptacle 30 is mounted in the tube receiving compartment 1, such that the substantially tangential to the pump head 6 aligned beam 30 is displaceable in its transverse direction. In a middle portion of the beam 30 (the bar-shaped receptacle) a in the sliding direction of the beam 30 extending longitudinal slot 32 is worked out in the hose receiving compartment 1, through which a lever-shaped handle 16 extends therethrough, which is formed at its free projecting end to a key. The handle 16 is pivotally mounted at its other, not visible end in the pump housing 4. In an axial center portion of the lever-shaped handle 16, this has a not shown in detail driving element, which is in operative engagement with the bar-shaped receptacle 30 to transform a pivotal movement of the handle 16 with a corresponding reduction of the lever mechanism thus produced in a sliding movement of the beam 30.

As further from the Fig. 5 , Right representation can be seen, the hose unit 14 also has two axially spaced collar-shaped brackets 22 which are engageable with notches 12 in the movable bar-shaped receptacle 30 in undercut engagement. In this case, however, the axial distance between the two brackets 22 along the tube 20 is so large that the tube center portion 20a between the brackets 22 bulges out into a U-shaped loop when the brackets 22 and the tube 20 in the bar-shaped hose receptacle 30 at the notches 12 inserted / inserted. The loop in this case has a mean radius which corresponds approximately to the U-shaped receiving shaft 1a around the pump head 6 around, so that the tube center portion 20a can be placed around the pump head 6 almost without effort in an untensioned state.

As soon as the hose unit 14 has been inserted into the hose receiving shaft 1a, the handle 16 is actuated, ie in the present case pivoted away from the pump head 6 and thus the beam-shaped receptacle 30 is pushed away from the pump head 6. In this way, the hose center portion 20a applies with a predefined clamping force to the partial circumference of the pump head 6, as shown in the right-hand illustration of Fig. 5 is shown.

As in the embodiments described above, the handle 16 according to the fifth preferred embodiment of the invention is dimensioned so that this shortly before reaching its exciting end position (see right representation in FIG Fig. 5 ) exceeds a dead center, whereupon the clamping force of the tube 20 holds the handle 16 in this exciting end position.

The fifth embodiment of the invention according to the Fig. 5 has a comparatively simple mechanical structure, since the pump head 6 can be held stationary and only the (preferably bar-shaped) receptacle 30 relative to the pump head 6 must be displaced. Thus, this construction is inexpensive to produce. Meanwhile, in this solution, even in the tensioned end position of the handle 16, the rotating parts are exposed.

To solve this problem, the sixth embodiment of the invention according to the left-hand illustration in FIG Fig. 6 in contrast to the fifth preferred embodiment, a modified handle 16 before. In this case, the button described above is replaced by a plate-shaped flap, which is articulated via a hinge, not shown, on the pump housing 4 and via a kind of plunger member 34 with the bar-shaped receptacle 30 is operatively connected. The plunger member may in the present case consist of a rod frame, which at a certain middle position to achieve a lever effect on the pivotable flap 16 and on the receptacle 30 is hinged. Or the plunger member 34 may comprise two laterally displaceably mounted on the hose receiving compartment 1 push rods, which are coupled via a lever or gear mechanism with the handle 16 to transform a pivotal movement of the handle 16 in a sliding movement of the push rods.

The operation of the hose receiving compartment 1 and, in particular, the lever mechanism 2 tensioning device 2 according to the sixth embodiment of the invention is substantially the same as the fifth embodiment. That is, the pivoting movement of the plate-shaped flap 16 is transformed via the plunger member 34 in a sliding movement of the bar-shaped receptacle 30, but at the same time for tensioning the hose unit 14 (see middle illustration of Fig. 6 ) the flap-like handle 16, the tube receiving compartment 1 with reaching the exciting end position according to the right representation in Fig. 6 essentially completely covering. Also in this case, the clamping device 2 is provided with a self-locking, as has already been described above with reference to the fifth embodiment.

Finally, it should be noted that the handle / actuator can not necessarily be operated manually but also by motor. Such an engine can basically be used in all embodiments already described in order to apply an actuating force to the handle / actuating element, for example via a toothed gear or a piston. However, the use of a motor drive also allows a modification of the clamping device, as described below with reference to the seventh preferred embodiment according to the Fig. 7 , middle illustration is described.

This is in principle a hose receiving compartment 1 with stationarily held pump head 6 and a plate-shaped cap 16, which is displaceably guided on the pump housing 4 or tube receiving compartment 1. The cover plate 16 has a receptacle for the hose unit 14 on consisting of two spaced notches 12 which are aligned with each other and into which the hose unit 14 can be inserted in an undercut manner by means of holders / engagement elements 22 fixed thereto (see the right-hand illustration in FIG Fig. 7 ). The distance between the two brackets 22 is selected so that the tube 20 in the inserted but still unstressed state substantially follows the alignment line between the notches 12.

The drive is presently formed by an electric motor, not shown, which is operatively connected via a lever mechanism consisting of eccentric / cam and plunger member with the cover plate 16. Alternatively, however, other constructions for a lever mechanism such as a gear transmission are conceivable.

By activating the motor, a pushing force is applied to the cover plate 16 via the lever mechanism, whereby it is moved from an open end position according to the middle illustration in FIG Fig. 7 in the direction of the pump head 6 shifts. In the course of this sliding movement, the tube 20 engages the pump head 6 and is stretched around the pump head 6 with further displacement to the exciting end position of the cover plate 16. The Selbsthemmwirkung is generated in this case, either by the engine or the downstream lever mechanism.

In the Fig. 9 the tensioning device 2 according to the invention in the form of the lever mechanism, in this case for displacing the hose holder 14 and the hose receptacle 30, shown in more detail in the perspective. To better illustrate a locking mechanism according to the invention for locking the clamping device in the maximum hose - clamping position, the clamping device is shown in the open position. It should be noted that the lever mechanism may possibly also be provided for the displacement of the pump head instead of the hose holder.

Accordingly, the actuating element of the lever mechanism is pivotally mounted on the hose receiving compartment / pump housing protective cap or 16 (could also be a swivel bracket), with which at the same time the hose receiving compartment 1 in the hose - clamping position front side (at least partially) is covered / is. On the hose receiving compartment 1 facing Inside the actuating element (protective flap) 16, a clamping or locking device 40 is preferably arranged in the form of a spring clamping / snapping device, which can further preferably form an undercut acting in opening-movement direction of the actuating element 16.

Specifically, the clamping / detent device 40 on one side of the protective flap 16 of the lever mechanism has two strip-shaped, mutually parallel projections 42 which project from the back of the protective flap 16 in the direction of the tube receiving compartment 1 and between them a clamping or latching gap (Groove) 44 train. In this case, the projections 22 may be formed substantially without a surface structure (exclusively to achieve a clamping action) or they have at their respective free (front) edge at least one undercut approximately in the form of a bead (clamping and / or locking action). Of course, the clamping / locking device 40 may also be otherwise designed, such as in the form of a mushroom-shaped base or the like pressure / locking buttons.

At the protective flap 16 are in accordance with the Fig. 9 hinged on both sides of the two plunger 34, the free ends of which are hinged to the relative to the rotatable pump head 6 slidably mounted in the hose receiving compartment 1 tube receptacle 30. In this way, a pivoting movement of the protective flap 16 is transmitted via the two plungers 34 with a specific lever ratio to the hose receptacle 30 (part of the lever mechanism) to the displacement relative to the pump rotor / pump head 6.

The tube receptacle 30 is in the form of a bar or Rahmes formed with a driver / latching hook 46 which projects transversely to the direction of displacement at a central portion of the frame 30. The sliding path of the frame 30 in the hose tensioning direction (ie away from the pump rotor 6) is limited by a stop or abutment projection 48 which protrudes in the hose receiving compartment 1 from the rear wall of tab or tongue-shaped in the receiving compartment space and thus according to Fig. 9 is arranged below the frame 30 (hose receptacle) seen in the hose tensioning direction.

The (separate) hose unit 14 according to the FIGS. 11 and 12 comprises the flexible / elastic hose (20) and the hose holder (22), which is bar-shaped in this case and at their free ends in each case a connection nipple 50, to which the two hose ends are shot to form a hose loop. Furthermore, the two connection nipples 50 also form a connection possibility for two external connection hoses (not shown further). In a central portion of the bar-shaped hose holder 22 a transversely projecting tab 52 is formed, which initially serves as a handle (handle) for easy installation and removal of the hose unit 14 in / from the hose receiving compartment 1. However, this tab 52 is arranged so that it projects after insertion of the hose unit 14 in the tube receiving compartment 1 (with partial wrapping of the pump rotor 6) in the direction of receiving tray opening or towards the protective or cover flap 16.

The tab 52 can either be provided without a surface structure (exclusively to achieve a clamping effect) or with an undercut (to achieve a locking effect), as will be described below.

Furthermore, in the middle section of the bar-shaped hose holder 22, a latching edge 54 is formed, which can be locked / locked (clipped) to the catch / latching hook 46 of the frame 30 when the bar-shaped hose holder 22 is inserted into the latching bar or frame-shaped hose receptacle 30. is clipped.

This insertion / Einclipposition especially with closed cover flap 16 of the lever mechanism is in the Fig. 10 shown.

Accordingly, we initially with open cover 16 (also corresponds to the actuator of the lever mechanism), the hose unit 14 inserted through the front receiving slot opening in the tube receiving compartment 1 by the loop-shaped tube 22 placed around the pump rotor 6 and the bar-shaped tube holder 22 with respect to the pump rotor 6 lower Side of the tube receptacle or the frame 30 is inserted. In this case, the undercut 54 locks / clips on the side of the hose holder 22 with the driver / latching hook 46 on the side of the frame 30 elastic, so that removal of the tube holder 22 from the frame 30 is difficult to overcome the elastic latching allows. At the same time pushes the driver / latching hook 46 in the hose tensioning direction on the hose holder 22. That is, the frame 30 is moved over the lever mechanism in the hose tensioning direction, presses the driver / latching hook 46 on the hose holder 22 to guide this. The loop-shaped tube 20 is guided past on both sides of the driver hook 46 in this direction toward the pump rotor 6, as in particular in the Fig. 9 is shown. In addition, protrudes in this inserted position of the hose unit 14, the tab 52 of the hose holder 22 toward the (front) opening of the tube receiving compartment 1 and arranged in tube tensioning direction thus below and before the driver / latching hook 46 of the frame 30 at.

Now, the cover flap 16 as an actuating element for tensioning the tube 20 and for closing the receiving compartment 1 folded (see Fig. 10 ), At the same time the frame 30 is moved with entrainment of the bar-shaped hose holder 22 in the hose tensioning direction and the hose 20 elastically tensioned around the pump rotor 6 (in the longitudinal direction stretched).

Upon reaching the maximum hose clamping position of the cover 16, the tab 52 is inserted on the hose holder 22 in the gap 44 between the clamping / locking strips 42 on the side of the cover 16 and clamped therein and / or locked. At the same time, the tube holder 22 strikes against the stop projection 48 of the receiving compartment 1 or comes to lie in the immediate vicinity of the stop projection 48, such that further advancement of the tube holder 14 in the direction of tube tensioning (substantially) is prevented.

Like from the Fig. 10 can be seen, the cover flap 16 is held as an actuator of the lever mechanism / the clamping device in the maximum hose tensioning position (closed position) of the tab 52 on the hose holder 22 (against unfolding), which for this purpose with the clamping / locking device 40 at the back of Cover flap 16 is engaged. The hose holder 22 in turn is the driver / latching hook 46 on the Hose receptacle / the frame 30 (part of the lever mechanism) held in a latching manner. Thus, this latching between the frame 30 and tube holder 22 does not open unintentionally, the stop projection 48 is provided which prevents further displacement of the tube holder 22 (away from the driver / latching hook 48) in maximum tube tensioning device or even the tube holder 22 against the driver / latching hook 48 presses.

• Schlauchaufnahme 30 mit daran ausgebildetem Mitnehmer-/Rasthaken 46,
• Schlauchhalterung 22 mit Hinterschneidung 54 (befindet sich im Rasteingriff mit dem Mitnehmer-/Rasthaken 46) und Lasche 52 sowie
• Abdeckklappe 16 mit Klemm-/Rasteinrichtung 40 (befindet sich in Eingriff mit der Lasche 52)

durch den Anschlagsvorsprung 48 in verriegeltem Zustand und kann nur unter Überwindung der Klemm-/Rastkraft zwischen Lasche 52 und Klemm-/Rasteinrichtung 40 wieder geöffnet werden, welche auch von der Spannkraft des Schlauchs 20 abhängig ist, die über die Schlauchhalterung 22/Lasche 52 Reibschluss verstärkend auf die Klemm-/Rasteinrichtung 40 der Abdeckklappe 16 wirkt.This is the entire assembly consisting of

• Hose receptacle 30 with trained catch / latching hook 46,
• Hose bracket 22 with undercut 54 (located in locking engagement with the driver / latching hook 46) and tab 52 and
• Cover flap 16 with clamping / locking device 40 (is in engagement with tab 52)

by the stopper projection 48 in the locked state and can only be opened by overcoming the clamping / latching force between tab 52 and clamping / latching device 40, which is also dependent on the clamping force of the tube 20, the frictional connection via the tube holder 22 / tab 52 reinforcing acts on the clamping / locking device 40 of the cover 16.

In summary, the present invention relates to a peristaltic pump for medical purposes with a pump housing, in which a tube receiving compartment 1 is formed / inserted, in which a pump head 6 is rotatably mounted and with a (separate) hose unit 14, the so inserted / inserted into the tube receiving compartment 1 is that a hose 22 of the hose unit 14 comes with the pump head 6 in this at least partially spanning engagement. For this purpose, a tensioning device is arranged on the pump housing or hose receiving compartment 1, which cooperates with the hose unit 14 or the pump head 6 to tension the hose 20 around the pump head 6 when actuated. According to the invention, the tensioning device has a lever mechanism, wherein preferably a lever element 16 of the lever mechanism at the same time forms or has a protective cap for at least partially covering the hose receptacle 30 / of the hose receiving compartment 1. A lever element (preferably the protective / cover flap) also has a clamping / locking device 40 in the maximum Hose tensioning position cooperates with a counter clamping / - latching device 52 on the hose unit 14, to prevent or prevent inadvertent release of the hose 20.

Claims (8)

1. Tube unit for a tube pump of the peristaltic pump construction type having a beam-like tube holder (22), which securely holds a flexible tube (20) at two tube-longitudinally-spaced apart positions in the manner of a loop, in order to come into undercutting holding engagement around a pump head (6) with a tube reception (30) of a lever mechanism (2) of the tube pump for the tensioning of the tube (20), characterised in that a lug (52) is formed, at the tube holder (22) and protruding transversely thereto, which lug is adapted for manual handling of the tube unit (14) at the insert-removal procedure and for stopping the lever mechanism in its tube - tension position.
2. Tube unit according to claim 1, wherein the tube unit is provided as an exchange component.
3. Tube unit according to any of the preceding claims, wherein, in a middle portion of the beam-shaped tube holder (22), a latching edge (54) is formed which can be clasped or locked with a transport/latching hook (46) of the tube reception (30) when the beam-shaped tube holder (22) is set into the tube reception (30).
4. Tube unit according to any of the preceding claims, wherein the lug (52) forms a counter clamp/latch apparatus which is adapted to engage in a clamp/latch apparatus (40) of the lever mechanism (2).
5. Tube unit according to any of the preceding claims, wherein the lug (52) is provided without surface structure exclusively to achieve a clamping effect.
6. Tube unit according to any of the preceding claims 1 to 5, wherein the lug (52) is provided with an undercut to achieve a locking effect.
7. Tube unit according to any of the preceding claims, wherein the tube holder (22) has at its free ends respectively one connecting nipple (50), at which the two tube ends are shot, forming a tube loop, and wherein the two connecting nipples (50) also serve as a connecting possibility for external connecting tubes.
8. Tube unit according to claim 1, wherein the tube unit is provided for use with a medicinal tube pump,

   - wherein the tube pump has a pump housing (4) in which a tube reception compartment (1) is formed/inserted, in which the pump head (6) is rotationally supported,

   - wherein the tube unit (14) can be inserted or is inserted into the tube reception compartment (1) such that the tube (20) comes into this at least partially wrapping-around tension engagement with the pump head (6) by displacing the tube holder (22) or the pump head (6), and

   - wherein the lever mechanism (2) disposed on the pump housing (4) or on the tube reception compartment (1), for the tensioning displacement of the tube holder (22) or of the pump head (6), with at least one lever element (16), at which a clamp or latch apparatus (40) is provided, which, at the attainment of a tube-clamp position, comes into engagement with the lug (52) disposed on the tube holder (22) for a locking of the tube holder (22) and the clamp device (2).

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