DEVICE WITH A COUPLING PERISTALTIC PUMP UNIT

Description

TECHNICAL FIELD

[0001] The present invention relates to a device for supplying and / or aspirating a fluid substance to or from a human or animal body, as well as a connecting part of such a device. Such devices are used particularly in the medical field, for example in negative pressure wound therapy combined with instillation or irrigation, in eye surgery, or in liposuction. STATE OF THE ART

[0002] In the medical field, there are a variety of applications in which, on the one hand, body fluids or secretions are suctioned from body cavities or wounds using a pump, and on the other hand, a substance is introduced into the body. Possible areas of application include, in particular, negative pressure wound therapy combined with instillation, eye surgery, and liposuction (fat removal). Depending on the application, the suction and the injection can occur simultaneously, sequentially, and / or alternately intermittently. Of course, there are also many medical applications in which only fluids are suctioned from the body without any substance being introduced. Likewise, there are also applications in which only a substance is introduced into the body without suction necessarily having to take place.

[0003] If a fluid substance is aspirated, it may be, for example, secretions released by the body in a wound area, or instillation or irrigation fluid, or both.

[0004] The substance to be administered can be, for example, a physiological or non-physiological saline solution, a drug, or a mixture thereof. The substance can be used, for example, to promote wound healing, prevent infections, or provide local anesthesia. The administration of the substance can thus serve for irrigation or therapeutic, diagnostic, and / or preventive purposes.

[0005] To administer the substance, similar to a conventional infusion, a fluid bag or bottle filled with the substance is often placed elevated above the body part to be treated, so that the substance is delivered to the area to be treated through a supply line due to hydrostatic pressure. Separately, body fluids are often suctioned away by a vacuum pump via a corresponding line.

[0006] To enable better adjustment and control of the substance delivery, and / or to be independent of the arrangement and, in particular, the height of the liquid container filled with the substance, systems are also well known in which the substance is delivered to the body using a pump, particularly a peristaltic or hose pump. The suction of fluid substances from the body can also be accomplished using a peristaltic pump.

[0007] Peristaltic or hose pumps of this type are disclosed, for example, in the documents EP 0 130 374 A2, DE 42 14 916 A1, DE 10 2005 055 013 B3, WO 94 / 03728, US 4,181,476, WO 91 / 14100 and US 5,927,956.

[0008] DE 38 12 109 A1 discloses a peristaltic pump which is designed to supply a cleaning agent to household appliances.

[0009] US 2014 / 0163487 discloses a device with two pumps. The pump head of a peristaltic pump, which serves to deliver a substance to the body, is arranged on the outside of the pump unit housing. A liquid container, which serves to hold an instillation liquid, can be connected to the pump unit housing. A hose guide is formed on the liquid container. Due to this, the pump head, when the container is connected to the pump unit housing, exerts a corresponding pumping action on the instillation tube leading from the interior of the container, thus pumping the instillation liquid toward the body.

[0010] For cleaning purposes and especially to extend the service life of the hose during storage and transport, it may be desirable to reduce the load on the hose when the peristaltic pump is not in operation.

[0011] US Pat. No. 4,218,197 and EP 0 388 269 B1 therefore each disclose a radially variable positioning of rollers on the pump head. By moving the rollers radially inward, the pressure exerted on the hose is reduced.

[0012] In the device disclosed in EP 1 743 100 B1, when coupling the pump head to a drive unit, an expanding part of a coupling element is pushed between the roller elements mounted on the pump head for radial movement. The roller elements are thereby pressed radially outward against the hose wrapped around them. The torque is transmitted from the coupling element to the pump head via drive pins, which engage in recesses provided on a retaining plate of the pump head connecting the roller elements. This solution has the disadvantage that no speed increase or decrease is possible when transmitting the torque from the coupling element to the pump head.

[0013] CN 205681233 U and CN 205117687 U disclose peristaltic pumps in which the pump head is formed by three roller elements connected by a connecting plate. The roller elements are radially movable to a certain degree and are driven by a shaft that is inserted between the roller elements, thereby pressing them radially against the hose. The torque is transmitted from the shaft to the pump head by friction. To achieve precisely defined pumping properties, the roller elements must be manufactured from high-quality materials and with tight manufacturing tolerances.

[0014] DE 694 02 428 T2 and US Pat. No. 6,280,440 B1 each disclose a peristaltic pump cassette in which three rollers are arranged within a loop formed by a hose. When the peristaltic pump cassette is used, a drive shaft is advanced centrally between the rollers, pressing them radially outward against the hose. During operation, the power is transferred from the drive shaft to the rollers via friction.

[0015] US Pat. No. 5,044,902 A proposes a peristaltic pump in which freely rotating rollers mounted on a rotating disc are inserted into the interior of counter rollers to transfer the rotary motion from the disc to counter rollers. At the same time, the counter rollers are pressed radially outward against a hose by a central roller. PRESENTATION OF THE INVENTION

[0016] It is an object of the invention to provide a peristaltic pump unit that is inexpensive to manufacture but still efficient.

[0017] To achieve this object, a device is proposed as defined in claim 1. Furthermore, claim 14 defines a connecting part for such a device. Advantageous embodiments of the invention are defined in the dependent claims.

[0018] The present invention therefore provides a device for supplying and / or sucking a fluid substance to or from a human or animal body, comprising a drive unit with a drive, such as in particular a motor; a connecting part which can be connected to the drive unit and which has a peristaltic pump unit with a pump head, a hose guide and a hose inserted in the hose guide, wherein the pump head has one or more roller elements which serve to roll on the hose in order to thereby transport the fluid substance through the hose, in particular towards the human or animal body or away from the human or animal body; and a coupling element which can be coupled to the pump head and which, when the connecting part is connected to the drive unit as intended, serves to transmit a movement from the drive to the pump head.

[0019] The pump head has a state decoupled from the coupling element, in which the roller element(s) exert no or a comparatively low mechanical pressure on the hose, and also has a state coupled to the coupling element, in which the roller element(s) are pressed against the hose by the coupling element with a comparatively high mechanical pressure.

[0020] When decoupled, the roller element(s) can move freely and independently of one another within a range defined laterally by the hose inserted into the hose guide. The individual roller elements are therefore not connected to one another, but are arranged separately within the aforementioned range. The roller elements are therefore independent components with regard to their freedom of movement. If multiple roller elements are present, they can usually touch one another when decoupled. By eliminating mutual connection between the roller elements, manufacturing costs and assembly are significantly reduced.

[0021] The roller element(s) are preferably each cylindrical.

[0022] The coupling element has a first toothed region. The pump head also has a second toothed region which, when coupled, engages with the first toothed region of the coupling element in such a way that a movement of the coupling element is transmitted directly to the pump head. Due to the mutual engagement of the first and second toothed regions, the torque is transmitted from the coupling element to the pump head during operation of the peristaltic pump in a particularly efficient manner and with an adjustable, clearly defined step-up or step-down ratio. The torque is transmitted directly, i.e., not via an intermediate part, from the coupling element to the pump head and in particular to the part(s) directly acting on the hose.If the pump head is formed by multiple roller elements, interconnecting the roller elements to limit their range of motion or ensure a consistent motion sequence is not absolutely necessary. Even if the individual roller elements touch each other during operation, the frictional force generated between the roller elements does not affect their movement, as the frictional connection from the coupling element to the individual roller elements is much more efficient. Even at very high pumping capacities and a correspondingly high pressure applied in the hose, the step-up or step-down ratio between the coupling element and the pump head is clearly defined.

[0023] In an alternative embodiment, the transmission of movement from the coupling element to the pump head, and in particular to the roller element(s), can also be achieved purely by frictional force. The corresponding surfaces of the coupling element and the roller wheel(s), which can then be cylindrical, for example, are then advantageously designed to have a high coefficient of friction.

[0024] When coupled, the coupling element presses the pump head or parts of the pump head, in particular one or more roller elements, radially outwards against the hose. In the case of multiple roller elements, the coupling element can also be referred to as a spreading element. When uncoupled, the pump head or its parts are displaced radially inwards compared to the coupled state due to the pressure of the hose. The hose material is therefore hardly subjected to any stress, which means the hose has a longer service life with regard to transport and storage and / or can be designed with a thinner wall. With a thinner wall thickness of the hose, which is usually made of silicone, the work required by the drive during operation is also reduced.

[0025] The roller element(s) may have a certain amount of lateral play when decoupled.

[0026] The pump head, and in particular its roller elements, are preferably pressed against the hose by the coupling element in the coupled state in such a way that they deform, clearly visible to the human eye, and particularly elastically, compared to the uncoupled state. This results in a certain spring effect, which achieves a clearly defined contact force on the hose even with relatively large manufacturing tolerances.

[0027] In order to achieve the coupling of the coupling element to the pump head and a continuous increase in the contact pressure on the hose when connecting the connecting part to the drive unit, the coupling element advantageously has a conically shaped section, in particular an end section.

[0028] Advantageously, the coupling element also has a cylindrical section, which, when coupled, serves to press the roller element(s) against the hose. This advantageously eliminates any existing toothed areas.

[0029] The coupling element can be part of the drive unit. But it can also be part of the connecting part.

[0030] The connecting part can, in particular, be a fluid container for collecting or providing a fluid. This can be a disposable part that is disposed of after a single use.

[0031] The roller element(s) are preferably each formed by a ring gear. A ring gear is a substantially circular object with a radially outward-facing outer surface and a radially inward-facing inner surface. A gear ring is typically formed on the outer and / or inner surface.

[0032] The second toothing area can thus be formed by an outer toothed ring formed on one or more ring gears.

[0033] The second toothed area can also be an inner gear ring formed on the ring gear. In such an embodiment, the ring gear preferably has a centrally arranged circulating element, which rests against the coupling element when coupled.

[0034] The pump head is preferably manufactured as a whole from a plastic, in particular polypropylene (PP), using an injection molding process. However, it can also be made from other materials, particularly organic ones.

[0035] The present invention also relates to a connecting part of a device for supplying and / or sucking a fluid substance to or from a human or animal body, in particular to a connecting part of a device according to the above-mentioned explanations. The connecting part has a peristaltic pump unit with a pump head, a hose guide and a hose inserted in the hose guide, wherein the pump head has one or more roller elements which serve to roll on the hose in order to thereby convey the fluid substance through the hose, in particular towards or away from the human or animal body. The pump head can be coupled to a coupling element which serves to transmit a movement from a drive to the pump head.When decoupled from the coupling element, the roller element(s) exert no or comparatively low mechanical pressure on the hose, but can be coupled to the coupling element in such a way that, when coupled, they are pressed against the hose by the coupling element with comparatively high mechanical pressure. When decoupled, the roller element(s) can move freely and independently of one another within a range that is laterally limited by the hose inserted into the hose guide. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Preferred embodiments of the invention are described below with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. In the drawings: Fig. 1a a perspective view of a schematically shown device according to a first embodiment of the invention with a connecting part in the form of a fluid collecting container and a pump unit housing, wherein the front wall of the pump unit housing is omitted; Fig. 1b a second perspective view of the fluid collecting container of the Fig. 1a shown device from a different viewing angle; Fig. 1c of the Fig. 1b shown fluid collection container in the same view, but with the cover removed; Fig. 1d perspective detail view of the peristaltic pump unit of the Fig. 1c shown fluid collection container including the coupling element of the Fig. 1a shown pump unit housing in decoupled state; Fig. 1e a perspective detailed view of the peristaltic pump unit of the Fig. 1b shown fluid collection container including the coupling element of the Fig. 1ashown pump unit housing in decoupled state; Fig. 1 fine perspective detailed view of the peristaltic pump unit of the Fig. 1c shown fluid collection container including the coupling element of the Fig. 1a shown pump unit housing in coupled state; Fig. 1g a perspective detailed view of the peristaltic pump unit of the Fig. 1b shown fluid collection container including the coupling element of the Fig. 1a shown pump unit housing in coupled state; Fig. 1h a plan view of the peristaltic pump unit of the Fig. 1c shown fluid collection container including the coupling element of the Fig. 1a shown pump unit housing in coupled state; Fig. 2a a perspective view of a connecting part in the form of a peristaltic cassette of a device according to a second embodiment of the invention, in uncoupled state; Fig. 2b the Fig. 2ashown peristaltic cassette with pump head in uncoupled state and with cover removed; Fig. 2c, which in the Fig. 2a Peristaltic cassette shown with cover removed and without pump head, instillation tube and coupling element; Fig. 2d the Fig. 2a shown peristaltic cassette in coupled state; Fig. 2edie in the Fig. 2a shown peristaltic cassette with pump head in coupled state and with cover removed; Fig. 2 fine perspective view of the cover, the coupling element and part of the pump head of the Fig. 2a shown peristaltic cassette in coupled state; Fig. 3a a perspective view of a connecting part and a coupling element of a device according to a third embodiment of the invention, in uncoupled state; Fig. 3b the Fig. 3ashown connector in decoupled state and with cover removed; Fig. 3c a top view of the peristaltic pump unit of the Fig. 3b shown connector in decoupled state and with cover removed; Fig. 3a perspective view of the Fig. 3a shown connector without cover, pump head and instillation tube; Fig. 3e a perspective view of the Fig. 3a shown connector and the one shown in the Fig. 3a shown coupling element, in coupled state; Fig. 3f, which in the Fig. 3e shown connecting part with coupling element in coupled state and with cover removed; Fig. 3g a top view of the peristaltic pump unit of the Fig. 3f shown connecting part with coupling element in coupled state and with cover removed; and Fig. 3h a central cross-sectional view along the line III-III through the Fig. 3gThe connecting part shown with the coupling element is coupled and the cover is removed. DESCRIPTION OF PREFERRED EMBODIMENTS

[0037] In the Figures 1a to 3h Different embodiments of devices according to the invention or of connecting parts according to the invention are shown. Figures 1a to 3h The devices shown are suitable for the instillation / irrigation treatment of wounds on the human or animal body, particularly in combination with negative pressure treatment. Accordingly, the following explanations refer to the use of the devices for instillation / irrigation treatment, possibly in combination with negative pressure treatment. However, it would also be possible, in principle, to use these devices, with appropriately adapted design, for example, for catheter irrigation, eye surgery, liposuction, or other medical applications.

[0038] Elements with an identical or similar technical function and effect are included in the Figures 1a to 3h in the various embodiments are provided with the same reference numerals.

[0039] The device of the first embodiment of the invention, which is shown in the Figures 1a to 1h shown, has a pump unit housing 1 with a connecting part in the form of a fluid collecting container 5 ( Figure 1 ) on.

[0040] While the pump unit housing 1 including its internal components is usually designed for multiple use and thus for the longest possible service life, the fluid collection container in many applications is a disposable item, particularly for hygienic reasons, which is disposed of after a single use, often lasting only a few days or hours.

[0041] The pump unit housing 1 has an overall essentially cuboid shape with a Figure 1aa front wall (not shown), a rear wall 11, a first side wall 12 and a second side wall 13, as well as an upper wall 14 and a lower wall 15. The front wall and the rear wall 11 each have a wall edge which protrudes from the first side wall 12 arranged therebetween. The fluid collection container 5 is held between these wall edges and can thus be attached to the pump unit housing 1 in a simple, yet secure and protected manner.

[0042] For suspending and holding the fluid collection container 5 on the pump unit housing 1, receiving hooks 190 are provided on the pump unit housing 1, into which correspondingly designed and arranged pins 554 of the fluid collection container 5 can engage. The pump unit housing 1 can have a retaining lug 191 attached to a spring-loaded element, which is designed to snap into a locking notch correspondingly designed on the fluid collection container 5 but not shown in the figures, in order to secure the fluid collection container 5 to the pump unit housing 1. To release the locking connection between the retaining lug 191 and the locking notch, the spring-loaded element to which the retaining lug 191 is attached can be pressed downwards against the spring force.

[0043] The projecting wall edges of the front wall and the rear wall 11 as well as the receiving hooks 190 and the retaining lug 191 together form a container receptacle 19 of the fluid collection container 5.

[0044] The pump unit housing 1 has a housing-side vacuum connection 17 which, when the fluid collection container 5 is attached to the pump unit housing 1, is coupled to a corresponding container-side vacuum connection provided on the fluid collection container 5 but not shown in the figures, so that a vacuum can be generated inside the fluid collection container 5 via the housing-side and the container-side vacuum connection in order to suck in body fluids via a secretion line not shown in the figures and collect them in the fluid collection container 5. The secretion line connects the fluid collection container 5 to a cavity or wound of a patient from which body fluids are to be sucked.

[0045] Within the first side wall 12, an adapter receptacle 18 is also provided, which serves to accommodate a hose adapter (not shown in the figures). The hose adapter connects the secretion line to the interior of the fluid collection container 5 via a container-side secretion connection provided on the fluid collection container 5, but also not shown in the figures.

[0046] A drive train 2 with a motor 20 and a motor shaft 21 connected to the motor 20 is housed in an interior space 16 of the pump unit housing 1. The pump unit housing 1, together with the drive train 2 and any other elements arranged in the interior space 16, forms a drive unit.

[0047] The motor shaft 21 drives with a first end region directly a Figure 1aFor illustrative reasons, not shown, a diaphragm pump is provided. By means of the diaphragm pump, which is arranged in the interior 16 of the pump unit housing 1, a vacuum can be generated for the suction of body fluids through the secretion line at the housing-side vacuum connection 17. With a second end region, which is in the Figure 1 Not visible, the motor shaft 21 is connected to a freewheel and / or gear 22, which connects the motor shaft 21 to a drive shaft 23. The drive shaft 23, which extends along the rotational axis of the motor shaft 21, protrudes through the first side wall 12.

[0048] On the outside of the pump unit housing 1, a coupling element 24 is non-rotatably mounted at the end of the drive shaft 23. The coupling element 24 has a circumferential gear ring 240 with regularly spaced, radially outwardly extending teeth. The gear ring 240 is arranged directly on the outside of the first side wall 12 and can even bear against it. Directly adjacent to the gear ring 240, the coupling element 24 has a cylindrical section 241, which at its outer end merges into a conical section 242. The conical section 242, which forms the outer end of the coupling element 24, tapers conically outward and thus toward the fluid collection container 5.

[0049] Via the coupling element 24, a pump head 30 of a peristaltic pump unit 30 ( Figure 1c) when the fluid collection container 5 is properly attached to the pump unit housing 1. The coupling element 24 thus serves to transmit the movement of the drive shaft 23 generated by the motor 20 to the pump head 30 of the peristaltic pump unit 30.

[0050] The motor 20 thus serves both to drive the diaphragm pump and to drive the peristaltic pump unit 3. In an alternative embodiment, two separate motors can of course also be provided in the interior 16 of the pump unit housing, one serving to drive the diaphragm pump and the other serving to drive the peristaltic pump unit 3.

[0051] The fluid collection container 5 has, as is particularly evident in the Figures 1a and 1bAs can be clearly seen, it has a front wall 50, a rear wall (not visible in the figures), two side walls 52 and 53, an upper wall 54, and a lower wall (also not visible). These walls are formed by a base part 55 made of an opaque material and a translucent part 56. A fill level scale 560 is provided on the side wall 52 formed exclusively by the translucent part 56.

[0052] The side wall 53 formed exclusively by the base part 55 has a centrally arranged, circular recess 555 on its outer side. In the radial direction, the recess 555 is essentially circumferentially delimited by a boundary wall 556. Furthermore, an inlet channel 557 and an outlet channel 558 are formed in the base part 55, each extending linearly and parallel to one another from the upper wall 54 into the recess 555.

[0053] The inlet channel 557, the outlet channel 558, and the boundary wall 556 together form a hose guide for an instillation tube 6. The instillation tube 6 is inserted into the hose guide in such a way that it extends through the inlet channel 557 into the recess 555 and from there along the boundary wall 556, predominantly around the pump head 30. The instillation tube 6 leads out of the fluid collection container 5 again via the outlet channel 558. To prevent the instillation tube 6 from slipping, particularly along its longitudinal direction, a holding element 559 is fixed to it in the areas where the inlet channel 557 and the outlet channel 558 open outwards in the upper wall 54. The holding elements 559 are inserted into recesses provided for this purpose in the inlet channel 557 and the outlet channel 558, so that longitudinal displacement and twisting of the instillation tube 6 is prevented.

[0054] At each end of the instillation tube 6, connecting elements 60 are provided, which serve to connect additional tubes. For example, one of the connecting elements 60 can be connected via a first additional tube to a container in which the substance to be administered to a patient is stored. The other connecting element 60 can then be connected, for example, via a second additional tube to a wound area, so that the substance is transported from the container through the instillation tube 6 to the wound by means of the peristaltic pump 3.

[0055] The pump head 30 of a peristaltic pump unit 3 is arranged within the recess 555. In the present embodiment, the pump head 30 is formed by three identically designed roller elements 300. The roller elements 300 are each formed by hollow gears that lie flat in the recess 555 and are freely movable there.

[0056] As is particularly evident from the Figure 1d As can be clearly seen, the roller elements 300 each have an outer gear ring 301 and a radially outwardly directed cylindrical surface 302. The roller elements 300, which are preferably each made in one piece from a plastic, form the satellite wheels of the peristaltic pump 3.

[0057] In the in the Figure 1dIn the situation shown, the pump head formed by the roller elements 300 is in a decoupled state, in which the coupling element 24 is arranged at a distance from the pump head 30. In other words, the fluid collection container 5 is not connected to the pump unit housing 1. In this decoupled state, the roller elements 300 are freely movable within the space of the recess 555, which is laterally delimited by the instillation tube 6. In particular, there is no connection between the individual roller wheels 300, meaning they can be rotated and moved as desired and independently of one another.

[0058] The roller wheels 300 are arranged in a triangle and rest with their cylindrical surfaces 302 on one side against each other and on the other side against the instillation tube 6. The roller wheels 300 exert a pressure in the Figure 1dshown decoupled state only exerts a slight pressure on the instillation tube 6. It would also be conceivable that they exert no pressure on the instillation tube 6 and do not touch it at all in the decoupled state. The contact of the roller wheels 300 against each other and against the instillation tube 6 according to the Figure 1d However, it has the advantage that it prevents rattling or mutual collision of the roller wheels 300, for example, during transport of the fluid collection container. Alternatively or additionally, positioning elements 57 can also be provided within the recess 555 to define the roller position during storage (see Figure 2c ).

[0059] Because the roller wheels exert little or no pressure on the instillation tube 6 when decoupled, damage to the instillation tube 6 during transport or storage is avoided. Furthermore, the instillation tube 6 can be completely sterilized internally. The material of the instillation tube 6 is unstressed and therefore has a longer service life. The requirements for the instillation tube 6 are thus reduced, and in particular it can be manufactured with thinner walls, which also reduces manufacturing costs. The same applies to the roller wheels 300, which, due to their unstressed state, are also subject to lower requirements and can therefore be manufactured with thinner walls and from a relatively inexpensive material that is well suited for injection molding, such as polypropylene (PP).A thinner-walled design of the instillation tube 6 also reduces the flexion or deformation work to be performed by the motor 20 via the drive train 2. The motor 20 can thus be operated with a lower motor power, or a smaller-sized motor 20 can be used.

[0060] When connecting the fluid collection container 5 to the pump unit housing 1, the coupling element 24, as shown in the Figure 1fshown, between the roller wheels 300. The conical section 242 presses the roller wheels 300 radially outward and against the instillation tube 6. The instillation tube 6 is pressed against the boundary wall 556 by the roller wheels 300 and is thereby deformed. When the coupling element 24 is fully advanced between the roller wheels 300, the conical section 242 of the coupling element 24 rests against the cylindrical surfaces 302 of the roller wheels 300 and thereby holds the roller wheels 300 in their position pressed against the instillation tube 6. The gear ring 240 of the coupling element 24 is in meshing engagement with the outer gear rings 301 of the roller wheels 300. This state of the pump head 30, when the coupling element 24 is fully advanced between the roller wheels 300, is referred to as the coupled state.

[0061] Due to the engagement of the gear ring 240 with the outer gear rings 301, a rotational movement of the coupling element 24 caused by the motor 20 is transmitted directly to the roller wheels 300, which then roll with their cylindrical surfaces 302 on the instillation tube 6 and thus achieve the desired pumping action of the peristaltic pump 3. Due to the mutual toothing, a clearly defined reduction of the rotational movement of the coupling element 24 to that of the pump head 30 or the roller wheels 300 is achieved.

[0062] The roller wheels 300 can be coupled, as is particularly the case in the Figure 1hAs can be seen, due to the pressure between the coupling element 24 and the instillation tube 6, the coupling element 24 can be elastically deformed compared to the uncoupled state. This does not represent a disadvantage; rather, it may even be desirable. Due to the slight deformation of the roller wheels 300, in this case from a circular to a slightly oval shape, a resilient effect is created. This allows a uniform contact force on the instillation tube 6 to be achieved by the various roller wheels 300, even with relatively large production tolerances.

[0063] As it is in the Figures 1b, 1c and 1gAs can be seen, the fluid collection container 5 has a cover 32 which covers the recess 555 as well as the inlet channel 557 and the outlet channel 558. In a central region of the recess 555, the cover 32 has a circular recess through which the coupling element 24 protrudes when the fluid collection container 5 is connected to the pump unit housing 1.

[0064] In the Figures 2a to 2fA further embodiment of a connecting part for a device according to the invention is shown. The connecting part here is a peristaltic cassette 5', which can be arranged, for example, as an intermediate part between a fluid collection container and the pump unit housing 1. The peristaltic cassette 5' has a housing with a hose guide for the instillation line 6, which is guided through the housing. Advantageously, substantially all parts of the peristaltic cassette 5' are manufactured from a plastic material using an injection molding process.

[0065] The peristaltic cassette 5' has an essentially cuboid-shaped, thin outer shape. The housing of the peristaltic cassette 5' has, as is particularly evident in the Figure 2c can be seen, a substantially circular recess 555, within which a pump head 30 of a peristaltic pump 3 is arranged to be freely rotatable ( Figure 2b). The pump head 30 is identical to the one used in the Figures 1a to 1h shown embodiment. It also has several roller wheels 300, which serve to roll on the instillation tube 6 placed around the pump head 30 in the recess 555 and, by mechanically deforming the tube, to supply a substance through the instillation tube 6 to the wound area.

[0066] In contrast to the Figures 1 a to 1 h shown embodiment, the coupling element 24 forms in the embodiment of the Figures 2a to 2f a part of the connecting part, in this case the peristaltic cassette 5'. The cover 32 has a conical curvature in the area around the central recess, which is reinforced by ribs on the side facing the recess 555 (see Figure 2f). The abutment of the gear ring 240 against these ribs prevents the coupling element 24 from falling out of the peristaltic cassette 5'. To bring the coupling element 24 into the state coupled to the pump head 30, it can simply be pressed from the outside through the recess provided in the cover 32 into the peristaltic cassette 5'. On its outward-facing side, the coupling element has an engagement structure that can be brought into engagement with a drive unit, so that the pump head 30 can be set into a rotary movement by the drive unit via the coupling element 24.

[0067] The Figures 1a to 2fThe embodiments shown can in principle have any number of roller wheels 300, in particular just one, two or more than three. The cylindrical section 241 of the coupling element 24 and the cylindrical surface 302 of the roller elements 300 have the advantage that the contact force of the roller elements 300 on the instillation tube 6 does not have to be transmitted via the toothed rings 240 and 301. In principle, the cylindrical section and the cylindrical surface 302 can also be omitted. The Figures 1a to 2f The peristaltic pumps 3 shown can also be used, in alternative embodiments, to suction fluids from a human or animal body. With purely frictional torque transmission, the gear rings 240 and 301 can be omitted.

[0068] A connecting part of a further embodiment according to the invention is shown in the Figures 3a to 3hThe connecting part can be, for example, a fluid container or a peristaltic cassette. If it is a fluid container, it can be used to collect aspirated fluids or to provide a substance to be administered. Just like the Figures 1a to 2f In the embodiments shown, the pump head 30 is also arranged within a circular recess 555 of a housing. An instillation tube 6 is also inserted into the recess 555 and extends along the boundary wall 556 around the pump head 30. In contrast to the embodiments shown in the Figures 1 a to 3 h In the embodiments shown, however, the instillation tube 6 crosses inside the connecting part and is led out of it on opposite sides.

[0069] The flow direction of the fluid through the inlet channel 557 and the Figures 3a-3hThe invisible outlet channel extends from top to bottom along the force of gravity. This prevents the fluid from flowing back. Due to the inlet channel 557 and the outlet channel opening outwards on opposite sides of the housing, and due to the arrangement of the connection elements 60 on opposite sides of the housing, kinking of the hose during hose installation by medical personnel can be prevented.

[0070] The pump head 30 of the embodiment of the Figures 3a to 3h has only a single roller element 300. As shown in the Figure 3cAs can be seen, in the decoupled state, it essentially completely fills the space laterally delimited by the instillation tube 6 without exerting any significant pressure on the instillation tube 6. The roller element 300 has a pot-like configuration with a centrally arranged, circular recess. The recess is surrounded in its opening area by an inner gear ring 303, which has a plurality of teeth arranged at regular intervals and extending radially inward. The roller wheel 300 can thus also be referred to here as a ring gear.

[0071] Centrally within the recess bordered by the inner gear ring 303, the roller wheel 300 has a revolving cam 304. The revolving cam 304 has a cylindrical outer surface, to which a conically tapered end section adjoins.

[0072] The roller wheel 300 has a cylindrical outer surface 302, which is formed by a circumferential edge region of the roller wheel 30 (see Figure 3b ). Between the edge region and an inner region, on the inside of which the inner gear ring 303 is formed, the roller wheel 300 has a circumferential recess. Due to this circumferential recess, the cylindrical outer surface 302 is elastically deformable to a certain degree.

[0073] When coupling the coupling element 24, which can be part of the connecting part but does not have to be, it is pushed through a recess provided in the cover 24 and into the central circular recess of the roller element 300. The coupling element 24 slides with its conical section 242 along the conical end section of the rotating cam 304 and thereby presses the roller element 300 in the radial direction towards the instillation tube 6. In the fully coupled state, the coupling element 24 lies, as shown in the Figure 3h can be seen, with its cylindrical section 241 laterally against the cylindrical outer surface of the rotating cam 304, whereby the roller wheel 300 is held in its position and the instillation tube 6 is squeezed together. The roller wheel 300 can thereby deform slightly in the area of ​​its cylindrical outer surface 302 due to the circumferential recess, as shown in the Figures 3gand especially 3h is recognizable.

[0074] In the coupled state, the outer gear ring 240 of the coupling element 24 is also in meshing engagement with the inner gear ring 303 of the roller element 300. As a result, a rotational movement of the coupling element 24 is transmitted directly to the roller element 300, so that in the coupled state, the pump head 30 can be set into a rotational movement via the coupling element 24 by means of an external drive. The pump head 30 formed by the roller element 300 rolls on the instillation tube 6, thereby generating the desired pumping effect.

[0075] The Figures 3a to 3hThe embodiment shown has the particular advantage that the transmission of the contact pressure from the coupling element 25 to the pump head 30 is effected at a distance from the point where the gear ring 240 of the coupling element 24 meshes with the inner gear ring 303 of the roller element 300. The transmission of the radial contact pressure, on the one hand, and the transmission of the torque, on the other hand, are thus spatially separated from one another. Furthermore, the pump head 30 can be formed from a single, advantageously one-piece roller element 300, whose radial extension within the recess 555 can also be maximized. LIST OF REFERENCE SYMBOLS

[0076] 1 Pump unit housing 300 Roll element 11 back wall 301 Outer gear ring 12 side wall 302 Cylindrical surface 13 side wall 303 Inner gear ring 14 Upper wall 304 Revolving cam 15 Lower wall 32 cover 16 Interior 17 Housing side 5 Fluid collection container Vacuum connection 5' Peristaltic cassette 18 Adapter holder 50 front wall 19 Container holder 52 side wall 190 Hook 53 side wall 191 Retention nose 54 55 Upper wall base part 2 Powertrain 554 cones 20 Motor 555 Deepening 21 Motor shaft 556 boundary wall 22 Freewheel / gearbox 557 Inlet channel 23 drive shaft 558 exhaust channel 24 coupling element 559 Holding element 240 sprocket 56 Translucent part 241 Cylindrical section 560 Level scale 242 Conical section 57 Positioning element 3 Peristaltic pump unit 6 Instillation tube 30 Pump head 60 Connecting elements

Claims

1. Device for supplying and / or aspirating a fluid substance to or from a human or animal body, which device has a drive unit (1, 2) with a drive (20); an attachment part (5; 5') which is attachable to the drive unit (1, 2) and which has a peristaltic pump unit (3) with a pump head (30), a hose guide (556, 557, 558), and a hose (6) placed in the hose guide (556, 557, 558), wherein the pump head (30) has one or more roller elements (300) which serve for rolling on the hose (6) in order thereby to convey the fluid substance through the hose (6); and a coupling element (24) which can be coupled to the pump head (30) and which serves to transmit a movement from the drive (20) to the pump head (30) when the attachment part (5; 5') is attached as intended to the drive unit (1, 2), wherein the pump head (30) has a state in which it is decoupled from the coupling element (24), and in which the one or more roller elements (300) apply no mechanical pressure or a comparatively low mechanical pressure to the hose (6), and in addition a state in which it is coupled to the coupling element (24), and in which the one or more roller elements (300) are pressed by the coupling element (24) against the hose (6) with a comparatively high mechanical pressure, wherein the one or more roller elements (300), in the decoupled state, are movable freely and independently of each other within a range (555) which is laterally limited by the hose (6) placed in the hose guide (556, 557, 558) characterized in that the coupling element (24) has a first toothing area (240), and the one or more roller elements (300) each have a second toothing area (301; 303) engaging, in the coupled state, in the first toothing area (240) in such a way that a movement of the coupling element (24) is transmitted directly to the one or more roller elements (300).

2. Device according to Claim 1, wherein the pump head (30) has several roller elements (300) which are able to touch each other in the decoupled state.

3. Device according to any one of the preceding Claims, wherein the one or more roller elernents (300) each have a lateral play in the decoupled state.

4. Device according to any one of the preceding Claims, wherein the one or more roller elements (300) in the coupled state are each pressed against the hose (6) by the coupling element (24) in such a way that, by comparison with the decoupled state, they deform in a way that is clearly visible to the human eye.

5. Device according to any one of the preceding Claims, wherein the coupling element (24) has a conically shaped portion (242).

6. Device according to any one of the preceding Claims, wherein the coupling element (24) has a cylindrical portion (241) which, in the coupled state, serves to press the one or more roller elements (300) against the hose (6).

7. Device according to any one of the preceding Claims, wherein the coupling element (24) is a part of the drive unit (1, 2).

8. Device according to one of Claims 1 to 6, wherein the coupling element (24) is a part of the attachment part (5').

9. Device according to Claim 8, wherein the attachment part (5) is a fluid container for collecting or making available a fluid.

10. Device according to any one of the preceding Claims, wherein the one or more roller elements (300) are each formed by a hollow wheel.

11. Device according to Claim 10, wherein the second toothing area is formed by an outer toothed ring (301) provided in each case on the hollow wheel.

12. Device according to Claim 10, wherein the pump head (30) has a single roller element (300), which is formed by hollow wheel, and wherein the second toothing area is an inner toothed ring (303) provided on the hollow wheel.

13. Device according to any one of the preceding Claims, wherein the pump head (30) is produced as a whole from plastic in an injection moulding method.

14. Attachment part (5; 5') of a device for supplying and / or aspirating a fluid substance to or from a human or animal body, in particular of a device according to one of the preceding Claims, having a peristaltic pump unit (3) with a pump head (30), a hose guide (556, 557, 558), and a hose (6) placed in the hose guide (556, 557, 558), wherein the pump head (30) has one or more roller elements (300) which serve for rolling on the hose (6) in order thereby to convey the fluid substance through the hose (6), wherein the pump head (30) can be coupled to a coupling element (24) which serves to transmit a movement from a drive (20) to the pump head (30), wherein, in a state decoupled from the coupling element (24), the one or more roller elements (300) apply no mechanical pressure or a comparatively low mechanical pressure to the hose (6), but can be coupled to the coupling element (24) in such a way that, in a coupled state, the one or more roller elements (300) are pressed by the coupling element (24) against the hose (6) with a comparatively high mechanical pressure, and wherein the one or more roller elements (300), in the decoupled state, are movable freely and independently of each other within a range (555) which is laterally limited by the hose (6) placed in the hose guide (556, 557, 558) characterized in that the one or more roller elements (300) each have a second toothing area (301; 303) configured for engaging, in the coupled state, in a first toothing area (240) of the coupling element (24).