EP1820967A1 - Hose cassette for a peristaltic pump - Google Patents

Abstract

The hose cassette (1) has a cartridge housing (3) and flexible pump hose segment (4) in the hose cassette, does not run into the pump (2) of engaged hose cassette (1) along overarching of circle segment (k) at an angle of ninety degree. The overarching of circle segment is at an angle of 120 degree, preferably at 140 degree, maximum at 160 degree.

Description

Field of the invention

The invention relates to a hose cassette for a peristaltic pump with a cassette housing, with a running through the cassette housing flexible pump tube segment, both ends of the pump tube segment are fixed in the cassette housing by means of a first fixing element and a second fixing element, wherein the first fixing element and the second fixing in Region of a first end face of the cassette housing are arranged, and wherein the cassette housing has a recess for engagement of a roller wheel of the pump in the interior of the cassette housing. The invention further relates to a peristaltic peristaltic pump system with such a tube cassette.

Prior art and background of the invention

Peristaltic peristaltic pumps are used, for example, as suction and rinsing pumps for medical purposes, in particular in minimally invasive surgery. Specific areas of application are arthroscopy, laparoscopy, urology, hysteroscopy and cystoscopy. In medical applications, in particular, sterility that meets all requirements is required, and for this reason, the tube cassette is usually discarded after use in order to avoid cross-contamination between different patients. Consequently, the hose cassettes must be inexpensive to manufacture on the one hand, and on the other hand, in particular, they must allow easy handling by operators. namely in the connection of the tube cassette with the pump and the release thereof.

In the context of known peristaltic pumps, there are basically two different basic concepts. The first basic concept is that the tube arranged around the roller wheel is pressed against the roller wheel by means of a pressure strap or the like. Such peristaltic peristaltic pump systems are for example from the literature US 4,798,580 . US 5,044,902 . US 5,213,483 and DE 100 62 600.9 A1 known. With a locking lever mechanism, the hose is fixed and pressed by means of the pressure bracket against the roller wheel.

The second basic concept, from which the invention proceeds in the core, is that the hose is pulled around the roller wheel by a tensile force of suitable size with a sufficient circumferential angle. As a result, a pressure bar or the like can be dispensed with. The tensile force is to be dimensioned in coordination with the elastic properties of the hose so that in the region of a roller of a roller wheel, the inner cross section of the hose is reduced to virtually zero. This is for example from the literature DE 199 60 668 Cl is known that in the context of a hose cassette, at least one adjoining the circle segment leg of the pump tube segment is slidably mounted in the cassette housing in the longitudinal direction of the hose between a mounting position and an operating position. This has basically proven excellent, but builds relatively expensive and is therefore expensive to manufacture.

A tube cassette of the structure mentioned above is from the literature US 4,537,561 known. Here, in the context of a tube cassette, a straight running pump tube segment set up. The tube cassette is inserted orthogonal to the extension of the pump tube segment in the peristaltic pump, wherein the pump tube segment comes into contact with the roller wheel and is stretched around the roller wheel in the course of insertion of the tube cassette with a small peripheral angle. In the case of the known hose cassette, it is disadvantageous that, due to the geometry of the relationships, sufficient pressure is achieved on the pump hose segment by the roller wheel only with relatively high forces. On the one hand, this requires high forces when inserting the tube cassette, on the other hand, components of the tube cassette are subjected to bending moments, whereby they must build relatively stable.

Technical problem of the invention

The invention is therefore based on the technical problem of specifying a tube cassette and a peristaltic tube pump system, wherein the tube cassette is easy and safe to install, easy to build and has a high reliability.

Broad features of the invention and preferred embodiments

To solve this technical problem, the invention teaches that the pump tube segment runs in the tube cassette with not inserted into the pump tube cassette along a at least an angle of 90 ° spanning circle segment. Pump tubing segment is not supported on the arc outside, but free of other components. Preferably, the circular segment spans an angle of at least 120 ° to at least 160 °, ideally about 180 °. With In other words, the ends of the Pumpenschlauchsegements each other at an angle of 90 ° to 220 °, preferably from 150 ° to 200 °, ideally from 170 ° to 190 °, for example, about 180 °. Here, an angle of 0 ° is to be understood as the angle of the ends to each other, which the ends have in a straight line extension of the pump tube segment to each other.

This ensures that the ends of the pump tube segment are loaded almost exclusively on train. In addition, a secure sealing of the tube by the roller wheel and consequently a high achievable peristaltic pressure is ensured by the high Umfassungswinkel, without Andruckbügel or support surfaces or the like. In any case, it is unnecessary to set pressure means for pressing the pump tube segment to the roller wheel when the tube cassette is inserted in the pump. Likewise, slidable ends of the pump tube segment are required for the purpose of tensioning the pump tubing segment about the roller wheel. The ends of the pump tube segment are rather fixed relative to the cassette housing.

In the context of the invention, two fundamentally different variants are possible.

On the one hand, it may be provided that the recess for the roller wheel extends in the region of the first end face between the first fixing element and the second fixing element. Then, the use of the hose cassette is effected by a substantially linear movement from a mounting position to an operating position in the direction radially to the roller wheel.

On the other hand, the recess may extend in a region of a side face of the cassette housing that is orthogonal to the first end face and parallel to the circle segment. Then, the insertion of the cassette in a mounting position by attaching the cassette on the roller wheel can be done in the axial direction. This is followed by either a linear displacement of the cassette in the radial direction of the roller wheel or a pivoting movement of the cassette with movement component radially to the roller wheel. Both movements end in the operating position. In each of the above variants, the pump tubing segment is tensioned around the roller wheel as the tubing cartridge is moved to the operative position.

A preferred embodiment of the invention is characterized in that the fixing elements have two hose lines each hydrostatically communicating with one end of the pump hose segment, wherein the hose lines are preferably arranged running substantially anti-parallel to the ends of the pump hose segment. Then, the hose lines can emerge in particular by a second end face of the cassette housing which is opposite the first end face. The term antiparallel here refers to the flow direction of a fluid in the ends of the pump tube segment or the tubing. This embodiment is particularly suitable for a variant of the invention in which the tube cassette is moved by a linear movement in the direction radially to the roller wheel in the operating position. In this embodiment, it is also particularly easy to set up that the roller wheel is arranged inside a pump housing, whereby any risk of injury or intervention in the area of the roller wheel can be excluded. The leadership of the linear movement of the tube cassette is then by a cassette shaft complementary to the shape of the tube cassette.

In a cassette housing according to the invention, it is also possible to arrange two (or more) pump hose segments which are stacked substantially parallel to one another. In a corresponding manner, the hose lines connected to the ends of the pump hose segments are then also to be executed twice. In this embodiment, two roller wheels are typically set up in the context of the pump, wherein in each case one pump hose segment is assigned to a roller wheel. In this embodiment can also be provided that both roller wheels are controlled separately. In this way, for example, an independent control of a suction function by means of a pump tube segment and a rinse function by means of the other pump tube segment done. But it is also possible to work with only one roller wheel, wherein the roller wheel then has the required width to clamp both pump hose segments simultaneously to the roller wheel.

Furthermore, it can be provided that at least one fixing element has a flexible membrane arranged in the region of the first end face and hydrostatically communicating with the pump tubing segment. In the operating position of the tube cassette, this flexible membrane is then in connection with a force and / or displacement transducer, whereby ultimately a pressure measurement is possible in the operating position of the tube cassette. It will usually be advisable to place this flexible membrane on each fixation element, which is the pressure side of the pump tubing segment.

The invention further relates to a peristaltic peristaltic pump system with at least one inventive Hose cassette, comprising a pump, which has at least one pump housing and a driven roller wheel, wherein the hose cassette and the pump housing mutually complementary connecting elements, which are arranged with the proviso to each other, that the pump tube segment connected to the pump housing and moved to an operating position tube cassette the roller wheel is stretched around.

As connecting elements are in particular releasable locking connections in question. In detail, the connecting elements may comprise the following components: a) at least one guide element arranged on or in the pump housing for a translatory movement of the hose cassette in directions orthogonal to the first end face (and radially to the roller wheel), b) at least one latching connection with one attached to the cassette housing first detent element and one attached to the pump housing and complementary to the first detent element second detent element, wherein the detent connection engages when moving the hose cartridge in the direction of the operating position in this, and c) with a release element for solving the latching connection. Alternatively, the connecting elements may comprise the following components: a) at least one pivot axis arranged on or in the pump housing and essentially parallel to the axis of rotation of the roller wheel about which the hose cassette is pivotable, the pivot axis being opposite the midpoint of the pump tube segment with respect to the b) a latching connection with a mounted on the cassette housing first latching element and a pump housing attached to the second and complementary latching second latching element, wherein the latching connection engages when pivoting the tubing cassette about the pivot axis in the operating position in this and c) with a release element for releasing the latching connection. In both cases, the tube cassette is moved in a simple manner and with one hand in the direction of the operating position or pivoted until the latching connection engages. By actuation of the release element not only the locking connection is then released, but by the set in the operating position voltage of the pump tube segment is also an automatic ejection of the tube cassette, especially in the case of the variant with translational movements between the mounting and operating position.

For a hose cassette with a flexible membrane, it can be provided that the pump housing has a force and / or displacement transducer connected to the flexible membrane of the hose cassette in the operating position of the hose cassette. As a result, the mediated by the flexible membrane pressure force of the fluid is converted in the fixing in an electrical signal, which can then be used for pressure display and / or control or regulation.

A peristaltic pump according to the invention typically has an electromotive drive means for the roller wheel. This can be a DC motor, AC motor or stepping motor. Between a drive shaft of the motor and the drive shaft of the roller wheel, a mechanical reduction gear can be provided. But it is also a direct drive possible, for example in the case of stepper motor. Typically, the speed of the engine is controllable. For this purpose, a control electronics will typically be set up, wherein an operator can set the desired flow rates or pressures by means of controls, such as keys or switches, and the control electronics then controls and regulates the correlated rotational speeds in accordance with an operating program. The control electronics In addition, pressure values measured in the pump hose segment will be compared with target pressure values or maximum pressure values, and the speed of the roller wheel will be controlled in a corresponding manner. In extreme cases, the roller wheel can also be controlled in the reverse direction. A peristaltic pump according to the invention can alternatively or optionally be operated with mains current or with a battery or rechargeable battery. The technologies for drive and control or regulation of a roller wheel of a peristaltic peristaltic pump are known and therefore need not be explained in detail here.

The tube cassette or cassette housing may have a coding which is specific for a purpose, such as arthroscopy, laparoscopy, urology or hysteroscopy. In the operating position of the tube cassette can then be read by suitable means of the pump this code. These means are then in communication with the electronic control and control suitable working parameters for the respective application according to the operating program. Here, the coding can be done mechanically, by means of a transponder or smart labels or the like.

Figur 1:

eine Außenansicht einer erfindungsgemäßen peristaltischen Pumpe,

Figur 2:

Einblick in eine erfindungsgemäße Schlauchkassette mit entfernter Seitenwandung,

Figur 3:

die wesentlichen mechanischen Komponenten des Gegenstandes der Figur 1 und

Figur 4:

eine Variante eines erfindungsgemäßen peristaltischen Schlauchpumpensystems.

In the following the invention will be explained in more detail by means of exemplary embodiments representing figures. Show it:

FIG. 1:

an external view of a peristaltic pump according to the invention,

FIG. 2:

Insight into a tube cassette according to the invention with the side wall removed,

FIG. 3:

the essential mechanical components of the article of Figure 1 and

FIG. 4:

a variant of a peristaltic hose pump system according to the invention.

FIG. 1 shows an external view of a pump 2 which has a pump housing 16 and at least one driven roller wheel 11. The roller wheel 11 is arranged in a cassette shaft 20 in the interior of the pump housing 16. In the cassette shaft 20 can be seen further a releasable latching hook 18 and a force or displacement transducer 19th

FIG. 3 shows the essential mechanical components of the pump 2. The roller wheel 11 is driven by a motor / gear unit 21. As part of the motor / gear unit 21, an electrically controllable stepping motor is arranged, which is connected to the drive shaft of the roller wheel 11. At the opposite end of the cassette slot 20 of the force or displacement transducer 19 is arranged. Furthermore, one recognizes a valve element which can be actuated in the axial direction, which forms a so-called pinch valve in cooperation with a hose line when the cassette is inserted. In this case, the actuating element 22, when activated, flattens the tubing so that it becomes impermeable to the fluid.

FIG. 2 shows a hose cassette 1 according to the invention, which can be inserted into the cassette shaft 20 of FIG. One first recognizes a cassette housing 3, in which a flexible pump hose segment 4 is arranged. The two ends 5, 6 of the pump tube segment 4 are in fixed to the cassette housing 3 by means of a first fixing element 7 and a second fixing element 8. The first fixing element 7 and the second fixing element 8 are arranged in the region of the first end face 9 of the cassette housing 3. The cassette housing 3 has a recess 10 for engagement of the roller wheel 11 of the pump 2 in the interior of the cassette housing 3. The recess 10 is arranged substantially in the region of the first end face 9 between the first fixing element 7 and the second fixing element 8. However, it also extends partially into the first face 9 orthogonal side surface 12 of the cassette housing 3, so that the cassette case 3 is completely pushed over the roller wheel 11. The pump tube segment 4 is arranged in the tube cassette 1 with not inserted into the pump 2 tube cassette 1 along an angle of about 180 ° spanning circle segment K extending. It is understood that the term of the circle segment K is not necessarily to be understood as extending exactly along a circular arc, but represents the course, which at a given angle of the two ends 5, 6 to each other (here 180 °) results.

FIG. 2 also shows that the fixing elements 7, 8 have two hose lines 13, 14 that each hydrostatically communicate with one end 5, 6 of the pump hose segment 4 or are connected thereto, in which case the hose lines 13, 14 are essentially antiparallel to the ends 5, 6 of the pump tube segment 4 are arranged to extend. The hose lines 13, 14 pass out of the cassette housing 3 through the second end face 15a of the cassette housing 3 which is opposite the first end face 9. In a fixing element 7 is arranged in the region of the first end face 9 and with the pump tube segment 4 hydrostatically communicating or hereby connected flexible membrane 15 set. This interacts with inserted in the operating position cassette with the force / displacement transducer 19 and then represents a pressure measuring device. In Figure 2, you finally recognize a drain hose 23rd

From a comparative examination of FIGS. 1 to 3, it can be seen that the cassette shaft 20 constitutes a guide element for a translational movement of the hose cage 1 in directions orthogonal to the first end face 9. On the cassette housing 3, a not shown detent recess 17 is arranged, which interacts with the latching hook 18 of the pump 2 in the operating position of the hose cassette 1 detent. Finally, one recognizes a button 24, which represents a release element for releasing the latching connection. Upon actuation of the knob 24 of the latching hook 18 is pulled in the axial direction of the roller wheel 11 and thus gives the latching recess 17 of the cassette housing 3 free. Due to the tension of the pump hose segment (4) in the operating position, the hose cassette 1 is then automatically ejected from the pump housing 16.

FIG. 4 shows a variant of the system according to the invention. Here, the tube cassette 1 is first placed in the axial direction of the roller wheel 11, wherein the roller wheel 11 passes through the recess 10 of the side surface 12. Thereafter, the tube cassette 1 is brought from the mounting position to the operating position, either by displacement of the tube cassette 1 in the direction radially to the roller wheel 11 or by pivoting the tube cassette 1 about a pivot axis which is outside the roller wheel 11. In principle, all the details explained above apply analogously. This variant of the invention will usually be used when replacing one in a cassette slot 20 arranged roller wheel 11 is a free standing outside the pump housing 16 and rotating roller wheel 11 is to be established.

Claims (10)

Hose cassette (1) for a peristaltic pump (2)
with a cassette housing (3),
with a flexible pump hose segment (4) running through the cassette housing (3),
wherein both ends (5), (6) of the pump tube segment (4) in the cassette housing (3) by means of a first fixing element (7) and a second fixing element (8) are fixed in place,
wherein the first fixing element (7) and the second fixing element (8) in the region of a first end face (9) of the cassette housing (3) are arranged, and
the cassette housing (3) having a recess (10) for engaging a roller wheel (11) of the pump (2) in the interior of the cassette housing (3),
characterized,
in that the pump hose segment (4) in the hose cassette (1) runs along a circular segment (K) spanning over at least an angle of 90 ° when the hose cassette (1) is not inserted into the pump (2). Hose cassette (1) according to claim 1, characterized in that the recess (10) in a region of the first end face (9) between the first fixing element (7) and the second fixing element (8) and / or that the recess (10) extends in a region of a first end face (9) orthogonal and the circle segment (K) parallel side surface (12) of the cassette housing (3). Hose cassette (1) according to one of claims 1 or 2, characterized in that the circular segment (K) an angle of at least 120 °, preferably at least 140 °, most preferably spans at least 160 °. Hose cassette (1) according to one of claims 1 to 3, characterized in that the fixing elements (7), (8) two each with one end (5), (6) of the pumping tube segment (4) hydrostatically communicating hose lines (13), ( 14), wherein the hose lines (13), (14) are preferably arranged running substantially anti-parallel to the ends of the pump tube segment (4). Hose cassette (1) according to one of claims 1 to 4, characterized in that the hose lines (13), (14) through one of the first end face (9) opposite the second end face (15a) of the cassette housing (3) emerge. Hose cassette (1) according to one of claims 1 to 5, characterized in that in the cassette housing (3) two or more substantially parallel to each other stacked extending pump tube segments (4) are arranged. Hose cassette (1) according to one of claims 1 to 6, characterized in that at least one fixing element (7), (8) arranged in the region of the first end face (9) and with the pump hose segment (4) hydrostatically communicating flexible membrane (15) having. Peristaltic tube system
with a hose cassette (1) according to one of claims 1 to 7,
with a pump (2) which has a pump housing (16) and at least one driven roller wheel (11),
wherein the hose cassette (1) and the pump housing (16) mutually complementary connecting elements (17), (18) which are arranged with the proviso to each other, that the pump tube segment (4) connected to the pump housing (16) and in an operating position moving hose cassette (1) is spanned around the roller wheel (11). Peristaltic peristaltic pump system according to claim 8, wherein the connecting elements (17), (18) have the following components: a) at least one on or in the pump housing (16) arranged guide element (19) for a translational movement of the tube cassette (1) in directions orthogonal to the first end face (9), b) at least one latching connection with a first detent element (17) attached to the cassette housing (3) and a second detent element (18) attached to the pump housing (16) and complementary to the first detent element (17), the detent connection being displaced when the hose cassette is displaced ( 1) in the direction of translational movement from a mounting position into an operating position engages and c) with a release element to solve the locking connection or a) at least one arranged on or in the pump housing (16) and substantially parallel to the rotational axis of the roller wheel (11) extending pivot axis about which the tube cassette (1) is pivotable, wherein the pivot axis relative to the center (Z) of the pump tube segment (4 ), with respect to the first end face (9), is displaced laterally, b) a snap-in connection with a first detent element (17) attached to the cassette housing (3) and a second detent element (18) attached to the pump housing (16) and complementary to the first detent element (17), wherein the detent connection is pivotable when the hose cassette (1 ) From a mounting position to an operating position about the pivot axis in the operating position in this snaps and c) with a release element to solve the locking connection. Peristaltic peristaltic pump system according to claim 8 or 9, wherein the pump housing (16) has a in the operating position of the hose cassette (1) with the flexible membrane (15) of the hose cassette (1) connected to force and / or Wegaufnehmer (19).

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