Medical hose pump assembly

Abstract

The invention relates to a medical hose pump assembly having an impeller (6) and at least one pump hose (30) enclosing the impeller (6) in a circumferential region, wherein the pump hose (30), in the portion thereof enclosing the impeller (6), bears against a counter bearing (40) on the pump hose exterior facing away from the impeller (6), and to an associated hose cassette. Furthermore, the invention relates to a morcellation system having a medical hose pump assembly which is connected to a morcellation instrument in order to suction off liquid and tissue.

Description

[0001] Applicant: Richard Wolf GmbH

[0002] Title: Medical Peristaltic Pump Unit Our Reference: RWP 3802 WO

[0003] Description

[0004]

[0001] The invention relates to a medical peristaltic pump unit and a hose cassette for such a medical peristaltic pump unit.

[0005]

[0002] Medical peristaltic pump units are used, for example, in conjunction with endoscopic surgical systems for aspirating fluid from the surgical field. In such peristaltic pumps, a pump tube is guided around an impeller, which has displacement elements on its outer circumference. When the impeller rotates, these elements compress and release the pump tube circumferentially, thereby causing a pumping or conveying motion inside the pump tube. To achieve sufficient pumping action while simultaneously maintaining desired service life and minimizing wear, it is important to correctly adjust the tension of the pump tube on the outer circumference of the impeller.

[0006]

[0003] The object of the invention is to provide a medical peristaltic pump unit which ensures correct positioning of the pump hose on the pump wheel in a simple manner.

[0007]

[0004] This problem is solved by a medical peristaltic pump unit with the features specified in claim 1, and by a hose cassette for a medical peristaltic pump unit with the features specified in claim 15, and a morcellation system with the features specified in claim 17.

[0008] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025, resolved. Preferred embodiments are described in the dependent claims, the following description, and the accompanying figures.

[0009]

[0005] The medical peristaltic pump unit according to the invention comprises a pump impeller and at least one pump hose that encompasses or encloses the pump impeller in a circumferential region. In the region where the pump hose encloses the pump impeller, in particular in a loop-like manner, an abutment is provided according to the invention. The abutment is arranged at a distance from the pump impeller such that the pump hose rests against the abutment with its side opposite the pump impeller. Thus, the pump hose is arranged in a section between the pump impeller and the abutment. This arrangement has the advantage that the pump hose is pressed against the abutment when the pump impeller rotates, thereby creating a defined contact surface against which the pump hose is pressed to seal. This makes it possible to keep the stress acting on the pump hose low.In particular, a sufficient seal of the pump hose to achieve the pumping effect or a vacuum inside the pump hose can be ensured essentially independently of the tension of the pump hose by a displacement body of the pump wheel continuously pressing the pump hose against the abutment.

[0010]

[0006] The abutment is preferably formed by a contact surface, in particular an arc-shaped contact surface extending concentrically to the axis of rotation of the 25 pump impeller. The contact surface preferably extends in a circumferential region of the pump impeller parallel to the outer circumference of the pump impeller, i.e., at a defined radial distance from the axis of rotation. The distance is preferably on the

[0011] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 Diameter of the hose so that the hose can be pressed against the contact surface by a displacement body and thereby sealed.

[0012]

[0007] According to a particular embodiment of the invention, the at least one pump hose can be fixed in a hose cassette, in which the abutment is also formed. The at least one pump hose can be fixed in the hose cassette, for example, by positive locking, force locking, and / or material locking. In this way, the pump hose can be arranged in the hose cassette in a defined manner relative to the abutment. Thus, a prefabricated assembly consisting of the pump hose and abutment can be created, which can be interchangeably inserted into the peristaltic pump unit by inserting the hose cassette into a corresponding cassette receptacle on the peristaltic pump unit.

[0013] 15

[0008] According to a further possible embodiment of the invention, the impeller is arranged on or in a motor housing, and the hose cassette is designed such that it can be detachably connected to the motor housing or inserted into the motor housing, for example, into a cassette receptacle formed on the motor housing, 20 wherein the impeller engages in the hose cassette and comes into contact with the at least one pump hose. If the abutment is formed in the hose cassette, the pump hose thus lies between the impeller and the abutment in a circumferential region of the impeller. In this circumferential region, the impeller, 25 for example via a displacement body, can act on the pump hose so that it is continuously sealed by pressing against the abutment, thereby allowing a volume of liquid in the pump hose to be moved or conveyed.

[0014] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

[0009] The at least one pump hose is preferably fixed at its axial ends in the hose cassette, preferably each at a connection element. The connection elements can be fixedly arranged in the hose cassette or formed integrally with other parts of the hose cassette. The connection elements are preferably each connected to a connection hose or have a connection for such a connection hose. In this way, the at least one pump hose can be designed separately from the connection hoses and, in particular, pre-assembled in the hose cassette in such a way that a defined positioning between the pump hose and the abutment and the connection elements is achieved. Thus, by positioning the hose cassette, the at least one pump hose can also be brought into a desired predefined position relative to the pump impeller.This allows for very easy commissioning of the peristaltic pump unit.

[0015]

[0010] According to a preferred embodiment, the fixings of the axial ends of the at least one pump hose, for example the connection elements or receptacles for the connection elements, as well as the abutment in the hose cassette, are fixedly positioned relative to each other. This means that the surface forming the abutment is fixedly positioned relative to the fixings of the pump hose. This allows for easy handling, since the entire hose cassette with the pump hose or hoses can be provided pre-assembled and simply needs to be inserted into the cassette receptacle. This then positions the pump hose(s) precisely relative to the impeller without the need for any further adjustments or settings.

[0016] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

[0011] The hose cassette preferably has an open side surface through which the impeller engages into the interior of the hose cassette or can extend into the interior of the hose cassette. Such a hose cassette can be designed, in particular, to be attached to the housing or motor housing of the peristaltic pump unit on an outside surface. In such a design, the impeller is preferably arranged outside the housing on a side surface or end face of the housing, and the hose cassette can be attached to the outside or outer wall of the housing or motor housing in such a way that it overlaps the impeller or the impeller engages in the open side surface and engages and interacts with the at least one pump hose in the hose cassette.

[0017]

[0012] According to a further preferred embodiment, an end face 15 of the hose cassette is designed to be open, or has an insertion opening, such that the hose cassette can be slid over the pump impeller with the open end face leading, preferably with an inner wall forming the abutment facing this open end face or insertion opening. In this way, the pump impeller can be inserted into the hose cassette from the open end face 20, i.e., through the insertion opening in the open end face, and moved towards the inner wall forming the abutment until the pump impeller comes into contact with the pump hose located on this abutment or inner wall, so that the pump hose is situated between the pump impeller and the abutment 25. The described connection elements, to which the at least one pump hose is fixed with its axial ends, are preferably located on the open end face of the hose cassette.arranged, being attached in the hose cassette or.

[0018] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025, state that the connecting elements can be formed integrally with the open end face. Preferably, the connecting elements are arranged on the open end face on opposite sides of the insertion opening, so that when the hose cassette is inserted into the cassette receptacle, the impeller engages or enters the hose cassette between the connecting elements. In this embodiment, the impeller preferably extends, as described above, through an open side surface, preferably a side surface adjacent to the open end face, into the hose cassette. The open end face and the open side surface are preferably angled, in particular at a substantially 90° angle to each other.

[0019]

[0013] According to another possible embodiment, the at least one pump hose is bent in a U-shape within the hose cassette, such that when the hose cassette is inserted into the cassette receptacle 15, the pump hose extends around the impeller in the arc-shaped section and extends tangentially away from the impeller with sections adjoining the arc-shaped section. The two tangential sections extend along two diametrically opposite sides of the impeller. The connecting ends 20 of the at least one pump hose are preferably located at or extend away from a front end of the hose cassette in the insertion direction. The connecting ends of the pump hose can be connected to connecting elements in the hose cassette, as described further below 25, or extend out of the hose cassette at the front end.The connection ends are preferably located to the side of an open area at the front end of the hose cassette, so that when the hose cassette is inserted into the cassette holder, the...

[0020] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025. The impeller engages between the connection ends in the hose cassette. This means that the connection ends are located on diametrically opposite sides of the opening at the front end, through which the impeller can be moved into the hose cassette, or with which the hose cassette is pushed over the impeller.

[0021]

[0014] The impeller preferably has at least one displacer element which acts on the at least one pump hose when the impeller rotates. The displacer element is preferably a displacer roller rotatably mounted in the impeller, which is arranged such that it rolls along the pump hose when the impeller rotates. The displacer roller is preferably arranged such that, in the area where it is in contact with the pump hose, it compresses and seals the pump hose against the abutment. By rolling the displacer roller, a sealing point is thus created in the circumferential region of the impeller, which moves along the pump hose. It is particularly advantageous to have two or more such displacer elements, preferably displacer rollers, arranged evenly distributed around the circumference of the impeller.

[0022] 20

[0015] According to a further preferred embodiment, at least one displacer body, preferably the at least one displacer roller in the pump impeller, can be resiliently mounted in the radial direction, i.e., in the radial direction with respect to the axis of rotation of the pump impeller. The resiliently mounted or spring-loaded displacer bodies 25 allow for tolerance compensation, so that even with tolerances occurring, sufficient pumping action or sufficient vacuum can always be ensured. At the same time, the force to

[0023] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 The insertion of the pump hose can be kept to a minimum, as no large stretching of the pump hose is required.

[0024]

[0016] According to a particular embodiment of the invention, at least two parallel pump hoses are provided, which enclose the impeller in a section of its outer circumference. Preferably, at least one first displacement body, which acts on one of the first pump hoses, and at least one second displacement body, which acts on the second of the pump hoses, are arranged on the impeller. Several first and several second displacement bodies can also be arranged, each acting on the first or the second pump hose, respectively. Here, too, the displacement bodies can preferably be displacement rollers, which can also be spring-mounted. By arranging two or more pump hoses, the flow rate through the pump assembly can be increased.Furthermore, if at least one first displacement body and at least one second displacement body are arranged circumferentially offset on the pump impeller, the pulsation of the peristaltic pump unit can be reduced, since a suction phase of the first pump hose can coincide with a pressure phase of the second pump hose, and vice versa. A corresponding arrangement of displacement bodies could also be provided for three or more parallel pump hoses.

[0025]

[0017] The described hose cassette with at least one 25 pump hose, more preferably at least two pump hoses, can, according to a further possible embodiment, be designed as an interchangeable, single-use item. This makes it possible to replace the pump hose, if necessary, with the connecting hoses.

[0026] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 to pre-assemble in or on the hose cassette, so that this pre-assembled unit is very easy to replace and thus there is no great cleaning effort, since all parts which come into contact with the fluid to be pumped can be disposed of after use.

[0027]

[0018] In addition to the medical peristaltic pump unit described above, the invention relates to a hose cassette for a medical peristaltic pump unit, preferably for such a medical peristaltic pump unit as described above. The hose cassette has a receiving space for a pump impeller, which is bounded on one side by a contact surface against which a pump hose rests. The contact surface forms a support for at least one displacement element or at least one displacement body in a hose pump unit. The pump hose is preferably fixed in the hose cassette, for example with its ends to connection elements arranged or formed in the hose cassette and / or also, for example, to the aforementioned contact surface.The pump hose is arranged in the hose cassette such that it rests against the contact surface, so that when the hose cassette is mounted on a pump impeller, the pump hose is located between the outer circumference of the impeller and the contact surface. Such a hose cassette is preferably designed as a replaceable, single-use item, so that by replacing the hose cassette 25, a peristaltic pump unit can be prepared very easily for the next use without having to clean the fluid-carrying lines. The contact surface is preferably designed as an arcuate surface that extends concentrically to the axis of rotation of a pump impeller designed to engage with the hose cassette.

[0028] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 The hose cassette further preferably has engagement or fastening elements which are designed to fix the hose cassette in a defined position on a housing of a peristaltic pump unit, so that the pump hose and the contact surface 5 are brought into a defined position relative to the pump wheel.

[0029]

[0019] The pump hose is preferably fixed at its axial ends in the hose cassette, preferably at each connection element, which has a connection for at least one connection hose or is connected to a connection hose. The connection elements can be inserted into and fixed in the structure of the hose cassette or be formed integrally with the rest of the structure of the hose cassette. To accommodate the pump hose and the connection hoses, pump hose fittings or connection fittings are preferably formed on the connection element, onto which the hoses are pushed. Regarding further preferred embodiments, reference is made to the preceding description of the hose pump unit.

[0030]

[0020] In a preferred application, the medical peristaltic pump unit, as described above, 20 serves to aspirate fluid, preferably to aspirate fluid and morcellated tissue in a morcellation system. For this purpose, the peristaltic pump unit is designed and dimensioned such that its inlet side can be connected to a morcellation instrument and can aspirate fluid or fluid with tissue via this instrument.

[0031] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

[0021] In addition to the medical peristaltic pump unit described above, the invention relates to a morcellation system which includes such a medical peristaltic pump unit as described above. In the morcellation system, the peristaltic pump unit for aspirating fluid is connected to a morcellation instrument. Preferably, the inlet of the peristaltic pump unit is connected to the morcellation instrument and a tissue collection container is arranged on the outlet side of the peristaltic pump unit. The peristaltic pump unit is dimensioned such that fluid containing tissue fragments, in particular morcellated / shredded tissue, can be pumped or conveyed through the peristaltic pump unit into the tissue collection container located on the outlet side.

[0032]

[0022] The invention is described below by way of example with reference to the accompanying figures. These show:

[0033] Fig. 1 shows a medical peristaltic pump unit according to the invention without a hose cassette.

[0034] Fig. 2 shows a medical peristaltic pump unit according to Fig. 20 gur 1 with attached hose cassette,

[0035] Fig. 3 shows a front view of the peristaltic pump unit according to Figure 1,

[0036] Fig. 4 shows a front view of the peristaltic pump unit with hose cassette according to Figure 2,

[0037] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 Fig. 5 a perspective view of a rear side of the hose cassette,

[0038] Fig. 6 shows a top view of the back of the hose cassette according to Figure 5,

[0039] 5 Fig. 7 a partially cutaway view of the medical peristaltic pump unit according to Figure 2,

[0040] Fig. 8 shows a sectional view through a first part of the mounting surface and the counter-mounting surface,

[0041] Fig. 9 shows a section through a second area of ​​the mounting surface with an opposing counter-mounting surface, as well as

[0042] Fig. 10 shows a morcellation system with a medical hose pump unit.

[0043]

[0023] Figures 1 and 2 show the overall structure of a medical peristaltic pump unit according to the invention. The medical peristaltic pump unit has a motor housing 2 in which at least one electric drive motor, a motor controller, and optionally further electronic and electrical components for operating the medical peristaltic pump and optionally further medical instruments can be arranged. A pump impeller 6 is arranged on an outer wall or outer side, in this case the front side 4, which can be driven by the electric drive motor inside the motor housing 2 via the shaft 3, causing it to rotate about the axis of rotation D. In this embodiment, the pump impeller has two [faces / diameters] facing [direction / side].

[0044] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025, describe two planes 7 and 9 offset from the axis of rotation D, each containing two displacement bodies in the form of displacement rollers 8. The displacement rollers 8 in the two planes 7 and 9 are arranged offset from each other by 90°. In each of the two planes 7 and 9, the two displacement rollers 8 are spaced 180° apart from each other.

[0045]

[0024] The impeller 6 is arranged on the front side 4 in the area of ​​a cassette receptacle 10. The cassette receptacle 10 has a support body 12 projecting from the front side 4 below the impeller 6, which forms a counter-contact surface 14 on its upper side for a hose cassette 10. The cassette receptacle also has two retaining elements 16 projecting from the front side 4 to the side of the impeller 6. The retaining elements 16 are mushroom-shaped and their projecting heads can engage lateral sections of a hose cassette 20. A guide rib 18, projecting from the front side 4, is also formed above the impeller 6. The guide rib 18 extends parallel to an insertion direction E, in which a hose cassette 20 can be inserted into the cassette receptacle 10.

[0046]

[0025] While Figures 1 and 3 show the motor housing 2 without the attached hose cassette 20, Figures 2 and 4 show the motor housing 2 with the attached hose cassette 20. To insert the hose cassette 20 into the cassette receptacle, it is first pushed parallel to the axis of rotation D and then in the insertion direction E into the cassette receptacle 10. The impeller 6 engages with the open side of the hose cassette 20 facing the motor housing 2. The hose cassette 20 is also open at its end face located at the front in the insertion direction E, or at its front end in the insertion direction E, or has an opening between

[0047] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 The legs 50 have an insertion opening 51, through which it can be pushed over the pump wheel 6 in the insertion direction E. The hose cassette 20 is guided by the guide rib 18 and the retaining elements 16 and pushed over the pump wheel 6 in the insertion direction E parallel to the surface of the front 5 side 4 until the hose cassette 20 rests against the counter-contact surfaces 14 on the upper side of the support body 12. To hold the hose cassette 20 on the front 4, the hose cassette 20 has two lateral engagement sections 22. These extend outwards in a tab- or rib-like manner transverse to the insertion direction E and are engaged by the retaining elements 16. When the hose cassette 20 is first moved transversely to the front side 4 during insertion, the retaining elements below the engagement sections 22 each engage in a recess 23.When the hose cassette 20 is subsequently moved 15 parallel to the front side 4 in the insertion direction E, the engagement sections 22 engage behind the mushroom-shaped heads of the retaining elements 16. Furthermore, the hose cassette 20 has a tab 24 with an opening 26 at its front end in the insertion direction E. When the hose cassette 20 is inserted into the cassette receptacle 10, a spring-loaded locking projection 28, which is mounted on the support body 12, engages in the opening 26. By applying pressure to the locking projection 28, it can be disengaged from the opening 26, and the hose cassette 20 can be removed from the cassette receptacle 10 in the opposite direction to the insertion direction E.

[0048]

[0026] Figures 5 and 6 show views of the rear side of the hose cassette 20, which faces the front side 4 when inserted into the cassette receptacle 10. The hose cassette 20 is designed as a dimensionally stable structure, preferably as a plastic injection-molded part. Inside the hose cassette 20, two parallel pump hoses 30 are arranged.

[0049] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 net. The pump hoses 30 are each connected at their ends to a connecting element 32, 34. The connecting elements 32 and 34 are designed here as inserts which are inserted into and fixed in the structure of the hose cassette 20, but could also be formed integrally 5 with the rest of the structure. Each of the connecting elements 32, 34 has two pump hose ports 36 for the pump hoses 30. The pump hoses 30 are pushed onto the pump hose ports 36 at their ends. Inside the hose cassette 20, the pump hoses 30 rest against an arcuate contact surface 40. The arcuate contact surface 40 extends concentrically to the axis of rotation D when the hose cassette 20 is inserted into the cassette receptacle 10. The mounting surface 40 forms a support. During pumping operation, the displacement rollers 8 press the pump hoses 30 against the mounting surface 40.Therefore, the radius of the arc-shaped contact surface 40 is chosen so that it has a correspondingly adjusted distance to the axis of rotation D when the hose cassette 20 is inserted into the cassette receptacle 10.

[0050]

[0027] The connection elements 32, 34 are essentially tubular, with the pump hose nozzles 36 each extending transversely to the longitudinal extent 20 of the connection elements 32, 34. The connection element 32 has a connection nozzle 42, which extends radially opposite to the pump hose nozzles 36 with respect to the longitudinal axis of the connection element 32. An outlet hose 44 is attached to the connection nozzle 42. The connection element 34 accordingly has a connection nozzle 46, which extends radially opposite to the pump hose nozzles 36 with respect to the longitudinal axis of the connection element 34, and onto which an inlet hose 48 is attached. The connection nozzles 42 and 46 extend

[0051] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025, are positioned at an acute angle to the insertion direction E, in this example at an angle of approximately 45°. This causes the inlet hose 48 and the outlet hose 44 to extend obliquely downwards during operation. The pump hose nozzles 36 extend in a parallel direction to the connection nozzles 42 and 46, so that the subsequent pump hose 30 initially extends radially towards the pump impeller 6 and is then deflected in an arc in a tangential direction along the contact surface 40. This promotes a flow direction from the inlet hose 48 into the pump hoses 36 and from the pump hoses 36 into the outlet hose 44 with only a few changes in direction, thus achieving an overall low flow resistance.In this embodiment, the pump hose nozzles 36 on the second connection element 34 extend with their longitudinal axes at an angle of 90° to the longitudinal axes of the pump hose nozzles 36 on the first connection element 32, the longitudinal axes intersecting essentially at the center or axis of rotation D of the pump wheel 6.

[0052]

[0028] The hose cassette 20 has an essentially U-shaped interior, defined by the arcuate contact surface 40. Legs 50 extend obliquely outwards from the open ends of this U-shaped form, in which the connecting elements 32 and 34 are arranged and fixed. The legs 50 extend in the direction of the pump hose nozzles 36. The lower sides 25 of the legs 50, which extend obliquely to the insertion direction E and face each other, form contact surfaces 52 that bear against the counter-contact surfaces 14 of the support body 12 when the hose cassette 20 is inserted into the cassette receptacle 10. That is, the contact surfaces 52 extend at the same angle to the insertion direction E as the counter-contact surfaces 14.

[0053] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

[0029] The connection element 32 has an interior space which extends to the contact surface 52 and is closed in the area of ​​the contact surface 52 by a membrane 54. That is, the membrane 54 extends into the contact surface 52 and, in this exemplary embodiment, forms at least approximately 50% of the contact surface 52. The membrane 54 is thus subjected to the pressure of the fluid located inside the connection element 32. A pressure sensor 56 is arranged in a region of the counter-contact surface 14 facing the membrane 54 or opposite it. When the hose cassette 20 is inserted into the cassette receptacle 10, the pressure sensor 56 rests against the membrane 54 and can thus detect the pressure inside the connection nozzle 32. In this embodiment, this is the outlet-side pressure, i.e., the pressure prevailing in the outlet hose 44.Monitoring the outlet pressure can be useful, for example, to detect overpressure that could cause the hose to detach or a collection container connected to the peristaltic pump unit to burst. It is understood that a diaphragm 54 with a pressure sensor 56 could similarly be arranged at the connection port 34 of the inlet hose 48.

[0054]

[0030] In the second leg 50, on which the inlet hose 48 is located, a data storage device 58, for example in the form of an RFID chip, is arranged or embedded. The data storage device 58 can contain information about the type of hose cassette 20, which can be used by a control unit in the motor housing 2, for example, to correctly adjust the drive motor. Alternatively or additionally, it could also be checked, for example, whether it is an approved hose cassette 20 for the respective peristaltic pump unit.

[0055] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 For reading and / or writing the data storage device 58, a reading device 60 or a read / write device 60 is arranged in the system body 12 in the area of ​​the counter-contact surface 14, which is opposite the data storage device 58. The reading device 60 can, for example, be an antenna device which is connected to suitably designed control electronics and is configured for reading and / or writing the data storage device 58. Thus, the diaphragm 54 for pressure measurement is arranged in one of the legs 50, while the data storage device 58 10 is arranged in the other leg 50. Accordingly, the pressure sensor 56 is located in one of the counter-contact surfaces 14, the one facing the diaphragm 54, while the reading device 60 is located in the other counter-contact surface 14.

[0056]

[0031] An application example for the peristaltic pump unit described above is described with reference to Figure 10. Figure 10 schematically shows a morcellation system which includes a peristaltic pump unit as described above with reference to Figures 1 to 9. Figure 10 shows the motor housing 2 with the peristaltic cassette 20 inserted into the cassette holder 10. The motor housing 2 serves to control the overall system and also includes a control unit for a morcellation instrument 62. The morcellation instrument 62 has a handle 64 in which a motor unit 66 for driving the morcellation instrument 62 is inserted. The motor unit 66 is connected to the motor housing 2 for power supply via a connecting cable 68.For operation, the morcellation system shown here has a foot switch unit 70, which includes foot switches by which the drive motor of the pump wheel 6 can be switched on and off, as well as the motor input.

[0057] Patent Attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025. The foot switch unit 70 is connected to the motor housing 2 via a control cable 72. For aspiration of fluid and tissue, the morcellation instrument 62 is also connected to the inlet hose 48 of the hose cassette 20. The outlet hose 44 of the hose cassette 20 leads into a tissue collection container 74. The tissue collection container 74, in turn, is connected via a hose 76 to a fluid container 78 for collecting the aspirated fluid. When the motor in the motor housing 2 is activated, the impeller 6 rotates, and fluid containing tissue is drawn into the hose cassette 20 via the inlet hose 48 through the pump hoses 30 and conveyed into the tissue collection container 74 via the outlet hose 44. There, the tissue particles are retained and the liquid flows via the hose 76 into the liquid container 78.Alternatively, the tissue collection container 74 could also serve as a combined container to collect the liquid, thus eliminating the need for a separate liquid collection container. To separate the tissue fragments from the liquid, a mesh could be arranged in such a combined container to retain the tissue fragments. In the described system, the morcellation instrument 62, with the handle 64, the inlet hose 48, the subsequent hose cassette 20, and the outlet hose 44, can be provided as a pre-assembled, single-use unit. For commissioning, the hose cassette 20 is inserted into the cassette receptacle 10 on the motor housing 2, the outlet hose 44 is connected to a tissue collection container 74, and the motor unit 66 is inserted into the handle 64.

[0058] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 Reference list

[0059] 2 Motor housings

[0060] 3rd wave

[0061] 4 Front

[0062] 5 6 Pump wheel

[0063] 7, 9 Level of the pump wheel

[0064] 8 displacement rollers

[0065] 10 cassette recordings

[0066] 12 plant units

[0067] 14 Counter-surface area

[0068] 16 retaining elements

[0069] 18 Guide bridge

[0070] 20 hose cassette

[0071] 22 intervention sections

[0072] 15 23 Exceptions

[0073] 24 tabs

[0074] 26 Opening

[0075] 28 Rastvorsprung

[0076] 30 pump hoses

[0077] 32, 34 connection elements

[0078] 36 pump hose connectors

[0079] 40 m² of installation area

[0080] 42 connection spigots

[0081] 44 Outlet hose

[0082] 25 46 Connection spigot

[0083] 48 Inlet hose

[0084] 50 thighs

[0085] 51 Insertion opening

[0086] 52 investment areas

[0087] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 54 Membrane

[0088] 56 Pressure sensor

[0089] 58 Data storage device 60 Reading device

[0090] 5 62 Morcellation instrument 64 Handle

[0091] 66 Motor unit

[0092] 68 connection cables

[0093] 70 Foot switch unit

[0094] 10 72 Control cables

[0095] 74 Tissue collection container 76 Hose

[0096] 78 liquid containers

[0097] D axis of rotation

[0098] 15 E Direction of insertion

[0099] Patent attorneys Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

Claims

22 / 26 Claims 1. Medical peristaltic pump unit with a pump impeller (6) and at least one pump hose (30) enclosing the pump impeller (6) in a circumferential area, wherein the pump hose (30) 5 in its section enclosing the pump impeller (6) rests on an abutment (40) on its outer side facing away from the pump impeller (6).

2. Medical peristaltic pump unit according to claim 1, in which the support is formed by a contact surface (40) and preferably by an arc-shaped contact surface (40) extending concentrically to the axis of rotation (D) of the pump wheel.

3. Medical hose pump unit according to claim 1 or 2, in which the at least one pump hose (30) is fixed in a hose cassette (20) in which the abutment (40) is also formed.

4. Medical peristaltic pump unit according to one of the preceding claims, in which the pump wheel (6) is arranged on a motor housing (2) and the hose cassette (20) is detachably connectable to the motor housing (2), wherein the pump wheel 20 (6) engages in the hose cassette (20) and comes into contact with the at least one pump hose (30).

5. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one pump tube (30) is fixed with its axial ends in the tube cassette (20) 25, preferably each on a connection element (32, 34) Attorneys at Law Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 fixed, which is connected to at least one connecting hose (44, 48) or has a connection (42, 46) for at least one connecting hose (44, 48).

6. Medical peristaltic pump unit according to one of the preceding claims, in which fixings of the axial ends of the at least one pump tube (30) and the abutment (40) in the tube cassette (20) are arranged in a fixed position relative to each other.

7. Medical peristaltic pump unit according to one of the preceding claims, wherein the tubing cassette (20) has an open side surface through which the pump wheel (6) engages into the interior of the tubing cassette (20).

8. Medical peristaltic pump unit according to one of the preceding claims, wherein an end face of the hose cassette (20) is designed to be open in such a way that the hose cassette (20) can be slid over the pump wheel (6) with the open end face forward, wherein preferably an inner wall forming the abutment (40) faces the open end face.

9. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one pump tube (30) is bent in a U-shape in the tube cassette (20), wherein connecting ends (32, 34) of the at least one pump tube (30) are preferably located at a front end of the tube cassette (20) in the insertion direction (E) or extend 25 away from this front end. Attorneys at Law Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 10. Medical peristaltic pump unit according to one of the preceding claims, wherein the pump wheel (6) has at least one displacement body (8) which acts on the at least one pump hose (30) when the pump wheel (6) is rotated, wherein the displacement body (8) is preferably a displacement roller (8) rotatably mounted in the pump wheel (6) and arranged such that it rolls on the pump hose (30) when the pump wheel (6) is rotated.

11. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one displacer body, preferably the at least one displacer roller (8) is resiliently mounted in the pump wheel (6) in the radial direction.

12. Medical peristaltic pump unit according to one of the preceding claims, in which at least two parallel pump tubes (30) enclose the pump wheel (6) and in which preferably at least a first displacement body (8), which acts on a first of the pump tubes (30), and at least a second displacement body (8), which acts on a second of the pump tubes (30), are arranged 20 on the pump wheel (6).

13. Medical peristaltic pump unit according to one of the preceding claims, wherein the hose cassette (20) with the at least one pump hose (30) is designed as an interchangeable, single-use article. Attorneys at Law Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025 25 / 26 14. Medical peristaltic pump unit according to one of the preceding claims, which is designed for aspiration of liquid, preferably in a morcellation system.

15. Hose cassette (20) for a medical peristaltic pump assembly, preferably for a medical peristaltic pump assembly according to one of claims 1 to 11, which has a receiving space for a pump impeller (6) which is bounded on one side by a contact surface (40) and bears against a soft pump hose (30) such that the pump hose (30) is located between the outer circumference of the pump impeller and the contact surface (40) when the pump impeller (6) is inserted.

16. Hose cassette (20) according to claim 15, in which the at least one pump hose (30) is fixed with its axial ends in the hose cassette (20), preferably fixed to each of a connection element (32, 34) which has a connection for at least one connection hose.

17. Morcellation system comprising a medical peristaltic pump unit according to one of the preceding claims, which is connected to a morcellation instrument (62) for aspirating fluid, wherein a tissue collection container (74) is preferably arranged on the outlet side of the peristaltic pump unit. Attorneys at Law Hemmer Lindfeld Frese RWP 3802 WO, 13 / 11 / 2025

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