Medical hose pump assembly

Abstract

The invention relates to a medical hose pump assembly comprising a motor housing (2), which has an impeller (6) on the outer face of the motor housing, and at least one replaceable hose cassette (20), in the interior of which at least one pump hose (30) is provided, wherein the motor housing (2) has a cassette receiving area (10) for receiving the hose cassette (20) on the outer face which has the impeller (6), the cassette receiving area being designed to releasably fix the hose cassette (20) to the motor housing (2), and the hose cassette (20) and the cassette receiving area (10) are designed such that, when the hose cassette (20) is fixed to the motor housing (2), the at least one pump hose (30) is in contact with the impeller (6). The invention further 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 3801 WO

[0003] Description

[0004]

[0001] The invention relates to 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 a pump impeller, which has displacement bodies on its outer circumference. When the pump impeller rotates, these displacement bodies compress and release the pump tube circumferentially, thereby causing a pumping or conveying motion inside the pump tube.

[0006]

[0003] From US 8,491,285 B2, a peristaltic pump is known in which a housing has a cassette receptacle, inside which the impeller is located. The pump hose is arranged in a cassette, which is inserted into the cassette receptacle, thereby bringing the hose into a position encompassing the impeller. The actual pump hose is curved and terminates at the open end of the pump cassette in two connectors, from which connecting hoses extend to the opposite end of the cassette and then out of it. When the pump cassette is inserted into the pump receptacle, the connectors lie at the bottom of the cassette receptacle. A disadvantage of this design is that the cassette receptacle is difficult to clean and the design of the hose cassette in the connectors requires a strong flow deflection.

[0007] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025

[0004] Against this background, the object of the invention is to provide a medical peristaltic pump unit that enables easy cleaning and optimized flow through the pump. This object is achieved by a medical peristaltic pump unit with the features specified in claim 1 and by a morcellation system with the features specified in claim 18. Preferred embodiments are described in the dependent claims, the following description, and the accompanying figures.

[0008]

[0005] The medical peristaltic pump unit according to the invention comprises a motor housing. Inside the motor housing, at least one electric drive motor and preferably the necessary control unit for operating the pump unit and, optionally, for communication with other devices are arranged. Furthermore, operating elements for setting and operating the peristaltic pump unit can be arranged on the outside of the motor housing. The motor housing could also include other components of a surgical system. On its outside, the peristaltic pump unit has an impeller, which can be rotated by, or is driven by, a drive motor arranged inside the motor housing. For arrangement on the impeller, the peristaltic pump unit also has at least one replaceable tubing cassette, inside which at least one pump tubing is arranged.The motor housing has a cassette receptacle on its outer side, at point 25 where the pump impeller is located, in which the hose cassette can be received and held. The cassette receptacle is designed such that the hose cassette can be detachably fixed in the receptacle on the outside of the motor housing. It is essential that, according to the invention, the cassette receptacle...

[0009] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, stated that the cassette is located on the outside of the motor housing and not as a recess on the inside. This ensures, firstly, that the cassette is easily accessible and can be easily cleaned from the outside. Secondly, more space is available on the outside of the motor housing for the necessary hoses, allowing the hoses to run with fewer bends or angles and resulting in more favorable flow characteristics. The hose cassette and the cassette holder are designed such that when the hose cassette is fixed to the motor housing, i.e., received in the cassette holder, at least one pump hose is in contact with the impeller, allowing the displacement elements arranged on the impeller to act on the pump hose.In this way, the pump hose can be very easily positioned relative to the impeller, as it can simply be replaced along with the entire hose cassette and arranged on the impeller. The position of the pump hose relative to the impeller is defined and predetermined by the hose cassette and the cassette holder that accommodates it, so that correct positioning of the pump hose relative to the impeller is always ensured when the hose cassette is inserted into the cassette holder. This allows for high operational reliability with easy handling.

[0010]

[0006] The cassette receptacle preferably has at least one retaining element which engages positively with a section of the hose cassette when the hose cassette is inserted into the cassette receptacle. The retaining element is preferably arranged such that it surrounds or overlaps a section of the hose cassette in order to positively secure it. More preferably, at least one releasable retaining element is provided which is arranged such that it secures the hose cassette against removal from the cassette receptacle.

[0011] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, and can be released to remove the hose cassette. This could, for example, be a spring-loaded locking or engagement element. However, other suitable releasable retaining elements could also be used. For example, a fixed retaining element could be provided on the cassette holder, which is engaged by a releasable element on the hose cassette. For instance, an elastic tongue or wall could be formed on the hose cassette, which releasably engages the projection on the cassette holder.

[0012] 10

[0007] In another possible embodiment, the cassette receptacle has at least two spaced-apart retaining elements. Furthermore, in this embodiment, the hose cassette preferably has engagement sections on two opposite sides, each of which engages with one of the retaining elements when the hose cassette is inserted into the cassette receptacle. The retaining elements are preferably arranged such that, relative to the insertion direction of the hose cassette, they engage laterally on the hose cassette or encompass engagement sections provided laterally on the hose cassette. The engagement sections can preferably be located 20 between the retaining elements and an outer wall of the motor housing, so that the hose cassette rests against this outer wall.The retaining elements are preferably arranged such that, when the hose cassette is inserted into the cassette receptacle, the engagement sections and the retaining elements interlock and, if necessary, are moved along the retaining elements by a certain insertion distance. For example, the retaining elements can be designed as a groove or a projection that overlaps a web-shaped engagement section. In this way, the retaining elements can simultaneously serve to guide the hose cassette in the insertion direction. In another possible embodiment, the engagement sections could

[0013] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, each designed as a groove or projection. The retaining elements are preferably arranged such that they encompass or engage behind the engagement sections in such a way that the hose cassette is held or secured in a direction transverse, particularly preferably perpendicular to the outside of the motor housing.

[0014]

[0008] In another possible embodiment, the at least one hose cassette has a front end in the insertion direction, which is designed to be open or has an insertion opening such that, when inserted into the cassette receptacle, the hose cassette can be pushed over the pump impeller with its open end or open end face and engage with it. That is, the pump impeller enters the hose cassette from the open end, i.e., through the insertion opening in the open end face, and thus comes into contact with the pump hose guided in the hose cassette in such a way that it can generate the desired pumping action. Preferably, during insertion, the pump impeller is moved with its outer circumferential side towards the pump hose guided in the hose cassette. That is, the pump hose is pushed together with the hose cassette over a section of the outer circumference of the pump impeller.The impeller preferably projects from an outer surface of the motor housing. The axis of rotation of the impeller preferably extends transversely, and more preferably substantially perpendicular to the outer surface or outer wall of the motor housing. If the outer surface of the motor housing is arranged at an angle to the vertical, the axis of rotation also preferably extends at an angle. The hose cassette preferably comes into contact with the outer surface of the motor housing with at least some wall sections. Particularly preferably, the hose cassette has a substantially U-shaped wall structure that extends perpendicular to the outer surface of the motor housing when the hose cassette is inserted into the cassette receptacle. The open.

[0015] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 The area of ​​the U-shaped wall structure between the two lateral legs forms the described open front end of the hose cassette.

[0016]

[0009] According to a further 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, 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 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 below, or extend out of the hose cassette at the front end.The connection ends are preferably located laterally to an open area at the front end of the hose cassette, so that when the hose cassette is inserted into the cassette receptacle, the impeller engages with the hose cassette between the connection ends. That is to say, 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 onto the impeller.

[0017]

[0010] According to another possible embodiment, the at least one hose cassette has an open side facing the motor housing or its outer wall, through which the

[0018] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 The impeller extends into the interior of the hose cassette when the hose cassette is inserted into the cassette holder. The open side is preferably bounded by the end face of a U-shaped wall structure as described above. The end face of the U-shaped wall structure is preferably positioned in the cassette holder such that it faces the outside of the motor housing, and particularly preferably abuts the outside or outer wall of the motor housing. On the opposite side, which faces away from the surface of the motor housing, a closed side surface of the hose cassette preferably extends transversely to the U-shaped wall structure. In this embodiment, the hose cassette thus has a closed side wall facing away from the motor housing when the hose cassette is inserted into the cassette holder.The hose cassette has one open side that abuts or rests against the motor housing. This allows the impeller to engage with the interior of the hose cassette through the open side, thus making contact with at least one pump hose. The hose cassette can be slid over the impeller, for example, transversely and / or parallel to the outside of the motor housing. A circumferential wall extends transversely to these sides, preferably in the form of the described U-shaped wall structure, with one side facing forward in the insertion direction also being open, so that the hose cassette can be slid over the impeller, for example, in an insertion direction parallel to the outside of the motor housing.

[0019]

[0011] A key advantage of the embodiment according to the invention and the described preferred embodiments is that the pump impeller is freely accessible on the outside of the motor housing and can therefore be easily cleaned and maintained. During operation, it is preferably completely covered by the hose cassette, so that

[0020] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025: The area between the impeller and the pump hose is covered, so that no foreign bodies or objects can enter this area during operation. This improves operational safety and at the same time minimizes the risk of injury to operators, as the moving parts are covered during operation.

[0021]

[0012] According to another possible embodiment of the invention, the at least one hose cassette has a plastic support structure in which the at least one pump hose is held at its axial ends. This makes it possible to fix the pump hose of a defined length in the hose cassette in such a way that, when the hose cassette is inserted into the cassette receptacle, the pump hose wraps around the impeller in a defined manner and bears against the impeller with a desired contact force. This prevents the pump hose from being arranged too loosely or too tightly in the area of ​​the impeller. In this way, high operational reliability can be achieved with easy handling.

[0022]

[0013] According to a further preferred embodiment, the hose cassette has an arc-shaped guide and / or contact surface for the at least one pump hose. This contact surface is preferably oriented towards the outer circumference of the impeller when the hose cassette is inserted into the cassette receptacle. The contact surface is spaced radially from the outer circumference of the impeller by a defined distance with respect to the axis of rotation of the impeller. The contact surface forms a counter-bearing for the pump hose, so that the pump hose can be pressed against the contact surface by the displacement elements on the impeller. The at least one pump hose can be compressed section by section by the displacement elements. This counter-bearing or contact surface ensures a reliable vacuum build-up in the

[0023] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 Inside of the pump hose when the pump wheel is rotated.

[0024]

[0014] The hose cassette preferably has at least one, preferably two, connection elements which connect the at least one pump hose to an inlet hose and / or an outlet hose. Preferably, the hose cassette thus has two connection elements spaced apart from each other, between which the at least one pump hose extends in an arc and to which the at least one pump hose is fixed at its opposite axial ends. An inlet hose is connected to one connection element and an outlet hose to the other connection element. This arrangement makes it possible to position the pump hose at a defined length between the connection elements and, if necessary, to configure the pump hose differently in diameter and material than the subsequent hoses.The described connection elements, to which the at least one pump hose is fixed with its axial ends, are preferably located or arranged on the open end face of the hose cassette, and may be attached to the hose cassette or formed integrally with it. Preferably, the connection elements are arranged on the open end face on sides opposite the insertion opening, so that when the hose cassette is inserted into the cassette receptacle, the pump impeller engages or enters the hose cassette between the connection elements.

[0025] 25

[0015] The described connection elements are preferably made of plastic and are further preferably formed integrally with the support structure of the hose cassette or fixed in the support structure by force-fit, form-fit and / or material-fit. In this way, a cost-effective, one-piece construction of the support structure with the connection elements can be created.

[0026] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 and the connecting elements can fix the ends of the pump hose at defined points in the structure of the hose cassette.

[0027]

[0016] Preferably, the hose cassette with the at least one pump hose is designed as a replaceable, single-use item. The subsequent inlet and outlet hoses can also be provided with the hose cassette as a pre-assembled, single-use item. This allows for easy handling, since after operation the entire hose cassette can be detached from the motor housing and disposed of, and a new, pre-assembled hose cassette can be replaced for the next operation. This minimizes cleaning effort.

[0028]

[0017] According to a particular embodiment of the invention, the hose cassette can have several, particularly preferably two, parallel pump hoses inside it. The impeller is designed such that it is in contact with both parallel pump hoses when the hose cassette is inserted into the cassette receptacle, so that the displacement elements on the impeller act on both pump hoses. The arrangement of two pump hoses allows for more uniform pumping. Furthermore, a larger flow cross-section can be provided in the pump.

[0029]

[0018] In the arrangement of two pump hoses, the pump impeller preferably has at least two displacement bodies which are arranged axially offset or spaced apart from each other. Thus, of these at least two displacement bodies, at least one first displacement body acts on a first of the two parallel pump hoses, and at least one second displacement body acts on a second of the two parallel pump hoses. Several first and several second displacement bodies can also be arranged around the circumference of the

[0030] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 The displacement bodies are arranged on the impeller, in particular uniformly. The first displacement bodies are preferably arranged in a first plane transverse to the axis of rotation of the impeller, and the second displacement bodies are arranged in a second plane transverse to the axis of rotation of the impeller, wherein the first and the second planes are offset in the direction of the axis of rotation, in particular parallel to each other. Thus, separate displacement bodies are preferably provided for the first and for the second pump hose. According to a further possible embodiment of the invention, this allows the at least one first displacement body and the at least one second displacement body to be arranged on the impeller offset from each other in the direction of rotation.As the impeller rotates, a vacuum is alternately created in the first and second pump tubes, resulting in a more consistent flow through the pump and at least partially compensating for the pulsations in the first and second pump tubes caused by the rotation of the displacement bodies. This reduces the overall pulsation of the pump.

[0031]

[0019] According to a further possible embodiment of the invention 20, the connection elements each have at least one, preferably two, pump hose ports for connecting a pump hose, which preferably extend transversely or tangentially to the axis of rotation of the pump wheel. In an embodiment with two parallel pump hoses, two pump hose ports 25 can preferably be provided. For this purpose, the pump hose ports on each connection element are preferably arranged parallel to each other and offset from each other in the direction of the axis of rotation of the pump wheel. In addition to one or two pump hose ports, each connection element preferably has a connection port which, depending on the use-

[0032] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025. The connection element is designed for connecting an inlet or outlet hose. The connection nozzle and the pump hose nozzle(s) extend from the connection element preferably in opposite directions, i.e., in particular diametrically opposite to a longitudinal axis of the connection element. This ensures that a hose connected to the connection nozzle, for example an inlet or outlet hose, can extend essentially in line with the pump hose, so that preferably only a slight or even no flow deflection occurs in the connection element, thus minimizing flow resistance.

[0033]

[0020] According to a further embodiment of the invention, at least one of the connection elements, preferably the connection element provided for connection to an outlet hose 15, has a pressure sensor or is designed to receive a pressure sensor or alternatively to be connected to a pressure sensor. This enables pressure measurement directly in the connection element via the pressure sensor. In this way, the pressure at the outlet side can preferably be measured and monitored. This allows, for example, excessive pressure at the outlet side 20 to be detected in order to issue an alarm signal and / or stop the operation of the pump, for example to prevent a container located at the outlet of the pump from bursting or a hose from coming loose due to overpressure.If the connection element for the system is designed with a pressure sensor, this has the advantage that pressure measurement is possible inside the connection element without the pressure sensor itself having to be located in the hose cassette. Thus, the hose cassette with the connection element can, for example, interact with a pressure sensor permanently mounted on the cassette holder to measure the pressure.

[0034] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 To determine the pressure inside the connection element or in the flow path inside the hose cassette.

[0035]

[0021] According to another possible embodiment, one of the connection elements, preferably the connection element intended for connection to an outlet hose, has a diaphragm adjacent to a fluid channel inside or to the interior of the connection element. Such a diaphragm serves to transmit pressure to the outside. That is, this diaphragm can, for example, interact with a pressure sensor or another suitable sensor for pressure measurement. For example, the diaphragm deflection can be recorded as a quantity representative of the pressure, or the diaphragm can be in contact with an external pressure sensor. The cassette receptacle preferably has a sensor, for example a pressure sensor, which is arranged and designed such that it interacts with the diaphragm for pressure measurement when the hose cassette is inserted into the cassette receptacle.The membrane is particularly favorably positioned on the sensor in the cassette holder when the hose cassette is in the operating position.

[0036] 20

[0022] The hose cassette preferably has at least one contact surface extending transversely to the insertion direction, and more preferably obliquely to the insertion direction, at its front end in the insertion direction. The contact surface further extends substantially transversely or normally or perpendicularly to the outside of the motor housing on which the 25 cassette receptacle is arranged. The oblique extension preferably runs at an angle between 30 and 60° with respect to the insertion direction. The cassette receptacle preferably has at least one counter-contact surface, which is arranged such that it is opposite the contact surface of the hose cassette and preferably on the

[0037] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025. The contact surface rests against the cassette when the hose cassette is inserted into the cassette holder. The contact surface and counter-contact surface preferably extend substantially parallel to each other. The contact surface, which extends transversely to the insertion direction, and in particular obliquely to the insertion direction, allows the hose cassette to be pressed against the counter-contact surface with its contact surface when inserted into the cassette holder, so that both are held in contact. Since the contact surface is preferably located in the area of ​​the connection element, the angled or oblique position of the contact surface has the advantage that a pump hose nozzle can preferably also extend obliquely away from the insertion direction, so that favorable hose routing for the subsequent hoses in extension of the pump hose can be achieved.Preferably, at least one membrane adjacent to a fluid channel of the hose cassette or to a flow path in the hose cassette, particularly preferably the pressure-measuring membrane described above, is located in one of the described contact surfaces, and at least one sensor interacting with the membrane is arranged in an opposing contact surface of the cassette receptacle. Thus, when the hose cassette is inserted into the cassette receptacle, the contact surface with the membrane is brought into contact with the opposing contact surface with the sensor, so that a pressure measurement inside the fluid channel can be taken by the sensor via the membrane. As described above, this is preferably a fluid channel on the outlet or pressure side of the hose cassette.

[0038]

[0023] According to a further possible embodiment of the invention, the hose cassette can have at least one data storage element. This can, for example, store operating data and / or contain configuration data on the basis of which the control of the drive is determined.

[0039] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 follows. Furthermore, it is possible that the data storage element contains identification data that identifies a hose cassette, so that by reading the data storage element, a controller in the motor housing can, for example, recognize which type of hose cassette is inserted into the cassette holder. Preferably, a correspondingly designed reading device is arranged on an opposite contact surface for reading the data storage device. The reading device can, for example, be an antenna device suitable for reading and / or writing an RFID data storage element. However, other reading or writing devices, such as magnetic, optical, or electrical read and / or write devices for communication with a data storage device, can also be located in the contact surface.Particularly preferably, the hose cassette is designed such that a contact surface with a membrane, as described above, is located on one connection element, and a data storage device is located on the contact surface on the opposite side, in the area of ​​a second connection element. In this way, the pairing of one contact surface with a counter-contact surface can be used for pressure measurement, and the pairing of a second contact surface with a second counter-contact surface can be used for data transmission.

[0040]

[0024] In a preferred application, the medical peristaltic pump unit, as described above, 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.

[0041] 30

[0042] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025

[0025] 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.

[0043]

[0026] The invention is described below by way of example with reference to the accompanying figures. These show:

[0044] Fig. 1 shows a medical peristaltic pump unit according to the invention without a hose cassette.

[0045] 20 Fig. 2 a medical peristaltic pump unit according to figure 1 with attached hose cassette,

[0046] Fig. 3 shows a front view of the peristaltic pump unit according to Figure 1,

[0047] Fig. 4 shows a front view of the peristaltic pump unit with 25 hose cassettes according to Figure 2.

[0048] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 Fig. 5 a perspective view of a rear side of the hose cassette,

[0049] Fig. 6 shows a top view of the back of the hose cassette according to Figure 5,

[0050] 5 Fig. 7 a partially cutaway view of the medical peristaltic pump unit according to Figure 2,

[0051] Fig. 8 shows a sectional view through a first part of the mounting surface and the counter-mounting surface,

[0052] Fig. 9 shows a section through a second area of ​​the mounting surface with an opposing counter-mounting surface, as well as

[0053] Fig. 10 shows a morcellation system with a medical hose pump unit.

[0054]

[0027] 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 [discs] facing [inwards / outwards].

[0055] Patent attorneys Hemmer Lindfeld Frese RWP 3801 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.

[0056]

[0028] 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-support 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.

[0057]

[0029] 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

[0058] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 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 in the insertion direction E parallel to the surface of the front 5 side 4 over the pump wheel 6 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 transversely to the insertion direction E in a tab- or rib-like manner 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.

[0059]

[0030] 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 an injection-molded plastic part. Inside the hose cassette 20, two parallel pump hoses 30 are arranged. The pump hoses 30 are each connected at their ends to a connection element 32, 34. The connection elements 32 and 34 are

[0060] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, here designed as inserts which are inserted into and fixed in the structure of the hose cassette 20, but could also be formed integrally with the rest of the structure. Each of the connection elements 32, 34 has two pump hose nozzles 36 for the pump hoses 30.

[0061] 5 The pump hoses 30 are attached at their ends to the pump hose fittings 36. 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 contact surface 40 forms a support. During pumping operation, the displacement rollers 8 press the pump hoses 30 against the contact surface 40. Therefore, the radius of the arcuate contact surface 40 is selected such 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.

[0062]

[0031] The connection elements 32, 34 are essentially tubular, with the pump hose ports 36 extending transversely to the longitudinal extent of the connection elements 32, 34. The connection element 32 has a connection port 42, which extends radially opposite to the pump hose ports 36 with respect to the longitudinal axis of the connection element 32. An outlet hose 44 is attached to the connection port 42. The connection element 34 correspondingly has a connection port 46, which extends radially opposite to the pump hose ports 36 with respect to the longitudinal axis of the connection element 34, and onto which an inlet hose 48 is attached. The connection ports 42 and 46 extend 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 diagonally downwards 30 during operation.The pump hose nozzles 36 extend in parallel.

[0063] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025. The direction towards the connection nozzles 42 and 46 is such that the subsequent pump hose 30 initially extends radially towards the impeller 6 and is then deflected in an arc along the contact surface 40 in a tangential direction. 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, with the longitudinal axes intersecting essentially at the center point or axis of rotation D of the impeller 6.

[0064]

[0032] 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-shape, 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 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.

[0065]

[0033] The connecting 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

[0066] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, are located in the contact surface 52 and, in this embodiment, form at least approximately 50% of the contact surface 52. The membrane 44 is thus subjected to the pressure of the fluid located inside the connection element 32. In one of the areas facing the membrane 54, or

[0067] A pressure sensor 56 is arranged in the area opposite the counter-surface 14. When the hose cassette 20 is inserted into the cassette receptacle 10, the pressure sensor 56 rests against the diaphragm 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-side pressure can be useful, for example, to detect overpressure, which could cause the hose to detach or a collection container connected to the peristaltic pump unit to burst. It can be understood that, similarly, a diaphragm 54 with a pressure sensor 56 could also be arranged at the connection nozzle 34 of the inlet hose 48.

[0068]

[0034] 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 20, 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. For reading and / or writing the data storage device 58, a read device 60 or a read / write device 60 is arranged in the system body 12 in the area of ​​the counter-surface 14, which is opposite the data storage device 58. The read device 60 can

[0069] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025, for example, describe an antenna device connected to suitably designed control electronics and configured for reading and / or writing the data storage device 58. The diaphragm 54 for pressure measurement is arranged in one of the legs 50, while the data storage device 58 is arranged in the other leg 50. Accordingly, the pressure sensor 56 is located in one of the mating surfaces 14, the one facing the diaphragm 54, while the reading device 60 is located in the other mating surface 14.

[0070]

[0035] An application example for the previously described peristaltic pump unit 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 tubular 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 for turning the drive motor of the pump wheel 6 on and off, as well as for controlling the motor unit 66. The foot switch unit 70 is connected to the motor housing 2 via a control cable 72. For aspirating 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 opens into a tissue collection chamber.

[0071] Patent Attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025. The fabric collection container 74 is connected via a hose 76 to a liquid container 78 for collecting the extracted liquid. When the motor in the motor housing 2 is activated, the impeller 6 rotates, and liquid containing fabric is drawn in through the inlet hose 48 via the 5 pump hoses 30 in the hose cassette 20 and conveyed through the outlet hose 44 into the fabric collection container 74. There, the fabric particles are retained, and the liquid flows through the hose 76 into the liquid container 78. Alternatively, the fabric collection container 74 could also be used as a combined container to collect the liquid, thus eliminating the need for a separate liquid collection container. To separate the fabric particles from the liquid, a net could, for example, be arranged in such a combined container to retain the fabric particles.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.

[0072] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 Reference list

[0073] 2 Motor housings

[0074] 3rd wave

[0075] 4 Front

[0076] 5 6 Pump wheel

[0077] 7, 9 Level of the pump wheel

[0078] 8 displacement rollers

[0079] 10 cassette recordings

[0080] 12 plant units

[0081] 14 Counter-surface area

[0082] 16 retaining elements

[0083] 18 Guide bridge

[0084] 20 hose cassette

[0085] 22 intervention sections

[0086] 23 exceptions

[0087] 24 tabs

[0088] 26 Opening

[0089] 28 Rastvorsprung

[0090] 30 pump hoses

[0091] 20 32, 34 Connection elements

[0092] 36 pump hose connectors

[0093] 40 m² of installation area

[0094] 42 connection spigots

[0095] 44 Outlet hose

[0096] 46 connection spigots

[0097] 48 Inlet hose

[0098] 50 thighs

[0099] 51 Insertion opening

[0100] 52 investment areas

[0101] 30 54 Membran

[0102] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 56 Pressure sensor

[0103] 58 Data storage device 60 Reading device

[0104] 62 Morcellation instrument 64 Handle

[0105] 66 Motor unit

[0106] 68 connection cables

[0107] 70 Foot switch unit

[0108] 72 control cables

[0109] 74 Tissue collection container 76 Hose

[0110] 78 liquid containers

[0111] D axis of rotation

[0112] E Direction of insertion

[0113] Patent attorneys Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025

Claims

27 / 32 Claims 1. Medical peristaltic pump unit with a motor housing (2) which has a pump impeller (6) on its outside, and with at least one replaceable hose cassette (20) in which at least one pump hose (30) is arranged inside, wherein the motor housing (2) has on the outside a cassette receptacle (10) for receiving the hose cassette (20) with the pump wheel (6), which is designed to fix the hose cassette (20) to the motor housing (2) at a pressure of 10 bar, and wherein the hose cassette (20) and the cassette holder (10) are designed such that when the hose cassette (20) is fixed to the motor housing (2), at least one pump hose (30) is in contact with the pump wheel (6).

2. Medical peristaltic pump unit claim 1, wherein the cassette receptacle (10) has at least one retaining element (16) which engages positively with a section of the tubular cassette (20) when the tubular cassette (20) is inserted into the cassette receptacle (10). 20 3. Medical peristaltic pump unit according to claim 1 or 2, wherein the cassette receptacle (10) has at least two spaced-apart retaining elements (16) and the tubing cassette (20) has engagement sections (22) on two sides facing away from each other, each of which engages with one of the retaining elements (16) when the tubing cassette (20) is inserted into the cassette receptacle (10). Attorneys at Law Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 4. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one tubular cassette (20) has a front end in the insertion direction (E) which is designed to be open in such a way that the tubular cassette (20) 5 can be pushed over the pump wheel (6) with its open end when inserted into the cassette receptacle (10) and can engage over it.

5. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one pump hose (30) is bent in a U-shape in the hose cassette (20), wherein connecting ends (32, 34) of the at least one pump hose (30) are preferably located at a front end of the hose cassette (20) in the insertion direction (E) or extend away from this front end. 15 6. Medical peristaltic pump unit according to one of the preceding claims, in which the at least one tubular cassette (20) has an open side facing the motor housing (2) through which the pump wheel (6) extends into the interior of the tubular cassette (20) when the tubular cassette (20) is inserted into the cassette receptacle (10).

7. Medical peristaltic pump unit according to one of the preceding claims, wherein the hose cassette (20) has a support structure made of plastic in which the at least one pump hose (30) is held at its axial ends, wherein the hose cassette (20) preferably has an arc-shaped guide and / or contact surface (40) for the at least one pump hose (30). Attorneys at Law Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 8. Medical peristaltic pump unit according to one of the preceding claims, wherein the hose cassette (20) has at least one, preferably two, connection elements (32, 34) which connect the at least one pump hose (30) to an inlet hose (48) and / or an outlet hose (44), wherein the connection elements (32, 34) are preferably made of plastic and are further preferably formed integrally with the support structure of the hose cassette (20) or are fixed in the support structure by force and / or form locking. 10 9. Medical hose pump unit according to one of the preceding claims, in which the hose cassette (20) with the at least one pump hose (30) is designed as an interchangeable article intended for single use.

10. Medical peristaltic pump unit according to one of the preceding claims, wherein the hose cassette (20) has two parallel pump hoses (30) inside it and the pump wheel (6) is designed such that it is in contact with both pump hoses (30) when the hose cassette (20) is inserted into the cassette receptacle (10). 20 11. Medical peristaltic pump unit according to one of the preceding claims, in which the pump impeller (6) has at least two displacement bodies (8), of which at least one first displacement body (8) acts on a first of the two parallel pump tubes (30) and at least 25 a second displacement body (8) acts on a second of the two parallel pump tubes (30), wherein preferably the at least one first and the at least one Attorneys at Law Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 The second displacement body (8) is arranged offset in the direction of rotation on the pump wheel (6).

12. Medical peristaltic pump unit according to one of the preceding claims, wherein the connection elements (32, 34) 5 each have at least one, preferably two, pump hose ports (36) for connecting a pump hose (30) and a connection port (46, 42) for connecting an inlet (48) or outlet hose (44), wherein the pump hose ports (36) and the connection ports (46, 42) preferably extend in opposite directions from the connection element (32, 34).

13. Medical peristaltic pump unit according to one of the preceding claims, wherein at least one of the connection elements (32, 34), preferably the connection element (32) provided for connection with an outlet hose (44), is designed to accommodate a pressure sensor (56) or to be positioned against a pressure sensor (56).

14. Medical peristaltic pump unit according to one of the preceding claims, in which one of the connection elements 20 (32, 34), preferably the connection element (32) provided for connection with an outlet hose (44), has a diaphragm (54) adjacent to a fluid channel inside the connection element (32, 34) and the cassette receptacle (10) has a sensor (56) which is arranged and designed such that it interacts with the diaphragm (54) for pressure measurement when the hose cassette (20) is inserted into the cassette receptacle (10). Attorneys at Law Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025 31 / 32 15. Medical peristaltic pump unit according to one of the preceding claims, wherein the at least one hose cassette (20) has at least one contact surface (52) extending transversely to the insertion direction (E), preferably obliquely 5 to the insertion direction (E), at its front end in the insertion direction (E), and the cassette receptacle (10) has at least one counter contact surface (14) which is arranged such that it is opposite the contact surface (52) and preferably bears against the contact surface (52) when the hose cassette (20) is inserted into the cassette receptacle (10), wherein preferably at least one membrane (54) adjacent to a fluid channel of the hose cassette (20) is located in a contact surface (52) and at least one sensor (56) cooperating with the membrane (54) is arranged in an opposite counter contact surface (14).

16. Medical peristaltic pump unit according to claim 15, in which at least one data storage element is located on a mounting surface (52) and a reading device (60) designed for reading the data storage device (58) is located on an opposite mounting surface (14). 20 17. Medical peristaltic pump unit according to one of the preceding claims, which is designed for aspiration of liquid, preferably in a morcellation system.

18. Morcellation system comprising a medical peristaltic pump unit according to one of the preceding claims, 25 which is connected to a morcellation instrument for aspirating fluid, wherein a tissue collection container is preferably arranged on the outlet side of the peristaltic pump unit. Attorneys at Law Hemmer Lindfeld Frese RWP 3801 WO, 13 / 11 / 2025

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