Tissue collection bag with tube system for peristaltic pumps

Abstract

The invention relates to a tissue collection bag (1) for a morcellation system, comprising two outer layers (2, 3) of a flexible sheet-like structure made of a liquid-impermeable material which enclose an internal volume and are connected to each other at their edges, an inlet connection (4) for supplying liquid that carries tissue particles, an outlet connection (5) for discharging the liquid, and a filter device for retaining the tissue particles in the internal volume. The invention proposes a three-layer structure of the tissue collection bag (1) in which at least one intermediate layer (6) of a flexible sheet-like structure made of liquid-permeable material impermeable to the tissue particles lies between the two outer layers (2, 3), forms the filter device and divides the internal volume into at least two chambers (7, 8), wherein the inlet connection (4) opens into one chamber (7) and the outlet connection (5) opens into the other chamber (8). The invention further relates to a tube system for a peristaltic pump (20), comprising a peristaltic tube (15) and a support, the support being designed as a frame (16) with holding elements (17, 18) which hold the peristaltic tube (15) on the frame (16) in an arc shape, and to a peristaltic pump (20) designed to receive the support of the tube system.

Description

[0001] Tissue collection bag with tubing system for peristaltic pumps

[0002] The invention relates to a tissue collection bag for a morcellation system, comprising two outer layers of a flexible sheet-like structure made of liquid-impermeable materials enclosing an inner volume and connected to one another at their edges, an inlet connection for supplying liquid carrying tissue particles, an outlet connection for discharging the liquid, and a filter device for retaining the tissue particles in the inner volume.

[0003] The invention also relates to a hose system for a peristaltic pump.

[0004] Morcellation is a surgical procedure for the comminution and removal of tissue during endoscopic interventions. The procedure is used in laparoscopic hysterectomies and prostate enucleation, among other procedures. The corresponding instrument is called a morcellator. The morcellator has a moving knife at its tip, which comminutes the tissue so that it can be suctioned out of the surgical field in the form of tissue particles in a rinsing fluid. In addition to the morcellator, the morcellation system also includes a suction system with a suction pump and a tissue collection device. The latter retains the tissue particles carried by the suctioned fluid using a suitable filter device. The tissue particles thus collected (the morcellate) are usually submitted for pathological examination.Common suction systems used in morcellation utilize a vacuum pump in conjunction with a vacuum container and a collection container, which are connected to each other and to the morcellator via tubing. The fluid and tissue particles aspirated at the morcellator flow through the collection container. The tissue particles are retained there, and the fluid flows toward the vacuum container. After the operation, the vacuum system is vented, and the collection container and tissue are removed. The collection container may contain a filter device (e.g., a mesh basket or filter bag). To prevent the collection container from collapsing under vacuum and blocking the fluid path, a rigid design is required. The container's volume must therefore be at least equal to the required capacity for tissue particles.

[0005] The previously described system has a complicated design. Its use is therefore complex, prone to failure, and expensive. Numerous hose connections must be manually reconnected during each operation and after each interruption. The collection container must be opened, cleaned, and resealed, and suitable filter devices must be available.

[0006] DE 10 2022 201 057 A1 describes a tissue collection bag of the type specified above, in which the filter device is formed by a liquid-permeable inner bag located within a liquid-impermeable outer bag. The tissue particles are retained in the inner bag. The combination of inner bag and outer bag, both made of pliable, flexible material, is advantageous because they can accommodate larger quantities of tissue. The tissue collection bag can be used downstream of a suction pump. In this case, no vacuum is applied to the tissue collection bag, eliminating the need for a rigid design. The tissue collection bag is a disposable product. Its handling is significantly simpler, less prone to failure, and more cost-effective than the previously described systems.However, the conventional fabric collection bag still has disadvantages: The structure with an inner and outer bag is comparatively complex and expensive to manufacture. In the previously known design, the inner bag moves freely within the outer bag. Accordingly, it can unintentionally roll up, knot, or fold. Then, only a fraction of the inner bag's surface area is available as a filter area, and only a corresponding fraction of the volume is available to absorb the fabric particles. The fabric collection bag can then become clogged, even if its capacity for absorbing fabric particles has not yet been exhausted.

[0007] Against this background, the object of the invention is to provide a tissue collection bag for a morcellation system that is improved compared to the prior art.

[0008] The invention achieves this object starting from a fabric collection bag of the type specified at the outset by means of a three-layer structure in which at least one intermediate layer of a flexible sheet material made of liquid-permeable and impermeable material for the fabric particles, located between the two outer layers, forms the filter device and divides the internal volume into at least two chambers, wherein the inlet connection opens into one chamber and the outlet connection opens into the other chamber.

[0009] In contrast to the fabric collection bag known from the aforementioned DE 10 2022 201 057 A1, the fabric collection bag of the invention does not have an inner bag as a filter device, but instead has at least one layer of a flexible sheet-like structure made of liquid-permeable material that is impermeable to the fabric particles. Thus, the fabric collection bag according to the invention can be very easily manufactured as a structure with at least three layers. For example, the three layers can each consist of a suitable plastic material (polymer film or fabric material), which are cut to size, placed on top of one another, and connected to one another, preferably at their outer, circumferential edges, in particular welded or sealed. A design with two or more intermediate layers is also conceivable, which are, for example, net-like sheet-like structures as filter devices that differ from one another in terms of mesh size.In this way, three or more chambers are created, with the possibility of classifying the retained tissue particles according to size.

[0010] The intermediate layer, which is connected to the outer layers, ensures that the entire surface of the intermediate layer is always available as a filter surface. The intermediate layer cannot move freely within the interior volume of the fabric collection bag independently of the outer layers, which reduces susceptibility to failure and further simplifies handling.

[0011] The fluid containing tissue particles passes through the inlet port into the chamber in the interior of the tissue collection bag according to the invention, which chambers are separated from one another by the intermediate layer and into which the inlet port opens. For this purpose, the inlet port is expediently connected to the pressure side of a suitable suction pump. The intermediate layer allows the fluid entering the tissue collection bag via the inlet port to pass through and retains the tissue particles, which are then collected in the chamber. The fluid freed from the tissue particles passes into the other chamber and from there leaves the tissue collection bag through the outlet port. The fluid can drain away, e.g., through a hose connected to the outlet port.

[0012] After surgery, it is often necessary to weigh the resulting morcellate, for example, to determine whether the tissue has been completely removed. For this purpose, the tissue collection bag according to the invention, along with the collected tissue, can simply be weighed after the fluid has drained away. The net weight of the removed tissue is then determined from the measured gross weight after subtracting the (known) weight of the tissue collection bag.

[0013] In one possible embodiment, the two outer layers are connected to one another at their edges, in particular sealed or welded, as already explained above. The at least one intermediate layer can be connected to at least one of the two outer layers at its edges. Advantageously, at least some edges of the intermediate layer coincide with those of the outer layers, so that the connection can be made in a single operation. The outer layers are advantageously at least sufficiently dimensionally stable that they keep the intermediate layer "stretched", i.e. fully unfolded. This ensures optimal filtering effectiveness.

[0014] The intermediate layer can be connected at least at one of its edges to the corresponding outer layer in a region outside at least one of the edges of this outer layer. This makes it possible to arrange the outlet connection on the corresponding outer layer in a low-lying region, which is located in particular completely below the chamber receiving the tissue particles. This ensures that the liquid can drain completely freely from this chamber. It is advantageous if the tissue collection bag tapers downwards in a funnel-like manner towards the outlet connection in the region below the chamber receiving the tissue particles.

[0015] The inlet port can be located on one of the outer layers at a position above the outlet port. This allows the fluid to pass through the tissue collection bag by gravity. After turning off the suction pump, venting the tubing system, and disconnecting the tubing system from the suction pump, any fluid remaining in the tissue collection bag can drain freely through the outlet port. Advantageously, the inlet and outlet ports are located on the same outer layer and are thus accessible from the same side of the tissue collection bag. This simplifies handling.

[0016] In another possible embodiment, the tissue collection bag has a holding device on at least one of its edges, particularly in the form of a hook or an eyelet. The holding device allows the tissue collection bag to be hung. It is conceivable that the tissue collection bag could be attached to a holder provided for this purpose on the suction pump.

[0017] At least a partial surface of the intermediate layer can have openings that are permeable to the liquid and impermeable to the tissue particles. The size of the openings can be, for example, 0.5-2 mm. At least a partial surface of the intermediate layer can be formed by a mesh or a grid film. The intermediate layer can also be made entirely of such a material.

[0018] In one possible embodiment, the inlet and / or outlet connection can each be reversibly closed in a fluid-tight manner using a closure element. A screw cap or a plug, for example, can serve as a reversible closure and is screwed or plugged onto a threaded or conical section of the inlet or outlet connection to form a seal. This means that the tissue collection bag can be easily closed after surgery, and the collected tissue particles can be placed directly in the tissue collection bag for pathological examination without the need for other containers. For surgery, the inlet and / or outlet connection can each be easily connected to the suction pump or a collection container for the draining fluid using a connecting adapter with a suitable tube.

[0019] An advantageous embodiment provides that at least one of the outer layers of the tissue collection bag has a rigidity sufficient for the tissue collection bag to assume an unfolded, flatly spread out configuration without the influence of external forces. It has been found that it is advantageous in practice if the tissue collection bag does not have to be converted into an unfolded, flatly spread out configuration during preparation for the operation. The rigidity of one of the outer layers can be adjusted so that the tissue collection bag automatically holds itself in the desired application configuration. This facilitates handling and contributes to an efficient surgical procedure. The rigidity can be achieved by a suitable material stiffness of at least one of the outer layers. Likewise, at least one of the outer layers can be equipped with suitable stiffening elements.The flat, spread-out configuration achieved through rigidity ensures optimal filtering effect and thus function of the fabric collection bag.

[0020] According to a further possible embodiment, one of the outer layers has a downwardly open pocket on the outside, extending essentially across the entire width of the outer layer, which is intended to accommodate a holder that holds the tissue collection bag upright and in an unfolded, flatly spread-out configuration. The pocket with the holder accommodated therein (e.g. in the form of a bracket) serves to easily transfer the tissue collection bag into the desired application configuration and to hold it in this configuration. Advantageously, the two outer layers of the tissue collection bag and the pocket are formed from a single blank of the liquid-impermeable material, which are connected to one another, in particular sealed, at their edges after the blank has been folded over twice.Manufacturing costs can be advantageously reduced by producing the outer layers and the pocket from a single sheet of liquid-impermeable material. The intermediate layer can, for example, be placed before the double fold in an area on the (future) inside of the sheet, which will form one of the two outer layers.

[0021] A further possible embodiment of the invention provides for the inlet connection to be designed as a multiple connection, intended for the selective supply of the fluid carrying tissue particles or another fluid, in particular a disinfection, sterilization, or preservation fluid, or for the removal of tissue particles from the interior volume of the tissue collection bag. The multiple connection allows different fluids to be supplied to the tissue collection bag simultaneously or sequentially. This eliminates the need to change the connection depending on the fluid source, which further simplifies the surgical procedure. A peristaltic pump is particularly suitable as a suction pump for morcellation systems. A peristaltic pump is a positive displacement pump that conveys fluids by compressing and relaxing a flexible tube, referred to here as a peristaltic tube.The peristaltic tube is a central component that runs between the suction and pressure sides of the pump. The peristaltic tube can be made of a flexible material (e.g., soft PVC or silicone). A rotor driven by a rotor drive, with several rollers typically arranged on its outer circumference, generates a section-by-section mechanical deformation of the peristaltic tube to pump a liquid contained in the peristaltic tube. For this purpose, the tube is arranged between the rotor and a support surface of the peristaltic pump. The support surface and the peristaltic tube attached to it run in an arc, typically in an arc segment around the rotor.

[0022] Peristaltic pumps are self-priming. They are particularly suitable for medical applications because the pumped fluid only comes into contact with the peristaltic tubing, not with any parts of the pump itself. Peristaltic pumps operate without any seals or valves that require cleaning and are subject to wear.

[0023] In morcellation systems, practical problems arise from the fact that the peristaltic tubing must be changed for each procedure. The peristaltic tubing must be precisely positioned between the rotor and the support surface. If the tubing is not routed correctly around the rotor, for example, with too much tension or too loose, proper pumping of the fluid carrying tissue particles is not possible. Changing and threading the peristaltic tubing is therefore a source of error. The process is also relatively time-consuming.

[0024] Against this background, a further aspect of the invention relates to a hose system for a peristaltic pump, comprising a peristaltic hose and a support, wherein the support is designed as a (sufficiently rigid) frame with holding elements that hold the peristaltic hose in an arc-shaped course within the frame. The peristaltic hose can be held inseparably, i.e., cannot be separated without destruction, on the frame of the support. The hose system with support and peristaltic hose is therefore a firmly connected composite part that can be used as a disposable article. The frame precisely defines the required arc-shaped course of the peristaltic hose.

[0025] The carrier is expediently designed for reversible attachment to a peristaltic pump, wherein the peristaltic hose, when attached to the peristaltic pump, engages with the rotor of the peristaltic pump, which rotor rotates about the rotor axis, and in doing so extends with its curved course around the rotor axis. The carrier is simply inserted by hand into the corresponding holder, whereby the hose held on the frame of the carrier is automatically correctly positioned relative to the rotor. For this purpose, the holder on the peristaltic pump can, for example, have a contour corresponding to the carrier, so that the carrier can only be positively attached to the peristaltic pump in exactly one position and orientation. This automatically ensures the exact positioning of the peristaltic hose. The source of error explained above is thereby eliminated.Changing the peristaltic tube is easy, safe and can be done in a very short time.

[0026] In one possible design, the frame has a U-shape, with a retaining element for the peristaltic tube provided at the free end of each U-leg and in the area of ​​the U-bend. This arrangement allows the tube's path to be precisely defined. The U-shape corresponds to the typical path in the form of a 180° bend. The distance between the U-legs defines the bend diameter.

[0027] In one possible embodiment, the carrier has at least one position marker for detecting the correct position on the peristaltic pump. The pump can have a corresponding sensor that detects the position marker and is provided for detecting the correct position of the carrier. A magnet, for example, is suitable as the position marker, and an electrical contact (e.g., a reed contact) that responds to the magnetic field is suitable as the associated sensor. The contact is positioned on the pump housing in such a way that it only switches when the position marker on the frame assumes the correct position.

[0028] In a further possible embodiment, an identification element for automatically identifying the hose system is arranged on the carrier. The identification element can be, for example, an RFID tag with a unique identification number. The associated peristaltic pump expediently has at least one reading device which is provided for reading the identification element of the carrier. By reading the RFID tag, it can be automatically determined whether the hose system used is a suitable and approved original part. The prescribed single use can also be ensured. The reading device can, for example, interact with the rotor drive in such a way that the pump delivery cannot be activated if it is determined that the hose system has already been used previously.

[0029] The tubing system may also include a suction tube, which is permanently or detachably connected to a suction-side end of the peristaltic tubing. The suction tube connects the suction side of the pump to a morcellator for aspirating the fluid containing tissue particles. The suction tube must normally be sterile.

[0030] In an advantageous embodiment, the hose system also includes a tissue collection bag as described above and below, wherein the peristaltic hose is permanently or detachably connected at its pressure-side end to the inlet connection of the tissue collection bag. The hose system with carrier, peristaltic hose and tissue collection bag can be provided as a disposable set for use with a peristaltic pump suitable for receiving the carrier. The prefabrication can significantly simplify and accelerate the preparation and performance of an operation compared to the prior art. The invention further relates to a peristaltic pump with a pump housing, a rotor and a motorized rotor drive, wherein the peristaltic pump, in particular the pump housing, has a receiving section which is designed to receive a carrier of a hose system designed as described above.The receiving section is expediently designed (e.g. by corresponding contours of the frame of the carrier of the hose system on the one hand and the receiving section on the other) so that the carrier is automatically positioned in the correct position, i.e. with the correct course of the peristaltic hose relative to the rotor. The peristaltic pump can have a support surface in the region of the receiving section which, when the carrier is received on the receiving section, is provided for supporting the peristaltic hose of the hose system positioned radially between the rotor and the support surface by the carrier, wherein the peristaltic hose can then be elastically deformed in sections between the rotor and the support surface under the mechanical action of the rotating rotor in order to pump the liquid carrying tissue particles. In one possible embodiment, the support surface can also be formed on the carrier of the hose system.

[0031] The peristaltic pump expediently comprises a holder provided for holding a tissue collection bag, as described above and below, on the peristaltic pump. The holder can, for example, be designed to be received in the pocket arranged on the outside of one of the outer layers of the tissue collection bag, thus holding the tissue collection bag in a flat, spread-out configuration. Attaching the tissue collection bag to the peristaltic pump ensures a fixed, predetermined positioning of the tissue collection bag relative to the peristaltic pump, thus ensuring proper pumping of the fluid carrying tissue particles into the tissue collection bag.

[0032] In the following, exemplary embodiments of the invention are explained in more detail with reference to the figures. They show: Fig. 1a: schematic plan view of a

[0033] Tissue collection bag according to the invention;

[0034] Fig. 1b: sectioned side view of the

[0035] Tissue collection bag from Fig. 1a;

[0036] Fig. 2a: sectioned side view of a

[0037] Design of the tissue collection bag with pocket;

[0038] Fig. 2b: schematic representation of a blank for producing the fabric collection bag of Fig. 2a;

[0039] Fig. 3: schematic representation of a hose system according to the invention;

[0040] Fig. 4: View of an inventive

[0041] peristaltic pump;

[0042] Fig. 5: Enlarged view of the receiving section for the hose system on the pump housing of the peristaltic pump.

[0043] In the following description of the figures, the same reference symbols and the same terms are used for the same elements.

[0044] Figs. 1a and 1b schematically show a tissue collection bag according to the invention. This is designated overall by the reference numeral 1. It is a tissue collection bag 1 for a morcellation system, comprising two outer layers 2, 3 of a flexible sheet material made of a liquid-impermeable material, for example, a transparent, flexible polymer film material, enclosing an internal volume and connected to one another at their edges 9, 10. An inlet port 4 serves to supply fluid containing tissue particles. An outlet port 5 is provided for the discharge of the fluid.The illustrated tissue collection bag 1 has a three-layer structure, in which an intermediate layer 6 of a flexible sheet material made of liquid-permeable and impermeable to tissue particles, for example a mesh, is located between the two outer layers 2, 3 and forms a filter device for retaining the tissue particles in the interior volume of the tissue collection bag 1. As can be seen in particular in Fig. 1b, the intermediate layer 6 divides the interior volume into two chambers, with the inlet connection 4 opening into one chamber 7 and the outlet connection 5 opening into the other chamber 8.

[0045] The fluid carrying the tissue particles enters chamber 7 through inlet port 4. For this purpose, inlet port 4 is conveniently connected to the pressure side of a suitable suction pump (not shown). The intermediate layer 6 allows the fluid to pass through and retains the tissue particles, which are then collected in chamber 7. The fluid passes through intermediate layer 6 into chamber 8 and exits the tissue collection bag 1 from there through outlet port 5.

[0046] As can be seen in Fig. 1a, the two outer layers 2, 3 are sealed together at their circumferential edges 9. The upper and lateral edges of the intermediate layer 6 coincide with the edges 9 of the outer layers 2, 3 and are sealed there. The intermediate layer 6 is sealed at its lower edge 10 only with the outer layer 2 on the right in Fig. 1b, specifically in an area above the lower edge 9 of the outer layers 2, 3. The outlet connection 5 is arranged in the lowest area of ​​the tissue collection bag 1. This area is located completely below the chamber 7 that receives the tissue particles. The area tapers funnel-like towards the outlet connection 5. A holding device 11 for hanging the tissue collection bag 1 is provided at the upper edge 9, in particular in the form of a hook or an eyelet (not shown). The height of the tissue collection bag can be, for example, 21 cm, while the width is 15 cm.

[0047] Fig. 2a shows a schematic sectional view of an embodiment of the fabric collection bag 1 with pocket 12. The pocket 12 is arranged on the rear side of the outer layer 3 and is open at the bottom. It extends essentially across the entire width of the outer layers 2, 3. For this purpose, as illustrated in Fig. 2b, the pocket 12 and the outer layers 2, 3 are made from a single blank 14 of a liquid-impermeable material. In the illustrated embodiment, the fabric collection bag 1 is obtained by folding and folding the blank 14 twice and sealing it at the edges 9 (see Fig. 1a). The vertical edges are formed by the fold lines between the sections 2, 3, 12 of the blank 14, so that no sealing is required there. Prior to this, the intermediate layer 6 is attached to the central section of the blank 14 by sealing along the edge 10.The pocket 12 is designed to accommodate a holder 13 for holding the tissue collection bag 1 upright in an unfolded, flat configuration. The holder 13, which is preferably in the shape of a bow or plate, preferably extends within the pocket 12 substantially across the entire width of the tissue collection bag 1, thereby stiffening it and holding it in the intended configuration.

[0048] Fig. 3 shows a hose system according to the invention for a peristaltic pump, comprising a peristaltic hose 15 and a support, wherein the support is designed as a rigid frame 16 with holding elements 17, 18 that hold the peristaltic hose 15 in an arcuate configuration on the frame 16. The peristaltic hose 15 is inseparably secured to the frame 16 of the support, wherein the frame, together with the holding elements 17, 18 and the peristaltic hose 15, form a disposable article usable with a corresponding peristaltic pump. The frame 16 can, for example, be provided as a plastic injection-molded part. The peristaltic hose 15 is made of a common elastomer material.

[0049] The frame 16 has a U-shape, with a holding element 17, 18 for holding the peristaltic tube being provided at the free end of each U-leg and in the region of the U-bend. The holding elements 17 are designed as sleeves that accommodate the peristaltic tube 15 and thus specify the length of the section of the peristaltic tube 15 lying between the holding elements 17. The holding element 18 is designed as a clip that rests on the peristaltic tube 15 in the region of the U-bend. The holding element 18 fixes the curved section of the peristaltic tube 15 in the plane of the frame 16. The U-shape corresponds to the usual course of the peristaltic tube 15 in the form of a 180° bend.

[0050] Also visible in Fig. 3 is a (sterile) suction hose 19 as a component of the hose system. The suction hose 19 is detachably connected to the suction-side end of the peristaltic hose 15 via a cone 25. The suction hose 19 serves to connect the suction side of the peristaltic hose 15 to a morcellator (not shown). The pumping direction is indicated by block arrows in Fig. 3.

[0051] Another component of the tubing system is a tissue collection bag 1, as shown in Figs. 1a and 1b. The peristaltic tubing 12 is connected at its pressure-side end to the inlet port 4 (Figs. 1a, 1b) of the tissue collection bag 1. The tubing system shown, comprising frame 16, peristaltic tubing 15, suction tubing 19, and tissue collection bag 1, forms a disposable set for use with a suitable peristaltic pump.

[0052] Fig. 4 shows an example of a peristaltic pump 20 with a pump housing 21 and a touchscreen 22 for operation. On the front of the pump housing 21, next to the touchscreen 22, a receiving section 23 is formed for the support formed by the frame 16.

[0053] Fig. 5 shows an enlarged view of the area of ​​the pump housing 20 with the receiving section 23. In the area of ​​the receiving section 23, a rotor (not shown) is provided which is driven in rotation by a rotor drive (not shown) installed in the pump housing 21. In the illustrated embodiment, the rotor is located behind a cover 24 which prevents manual intervention during operation. The cover 24 can be designed as a flap which can be folded open to insert the carrier of the hose system. The frame 16 of the carrier is designed for reversible reception in the receiving section 23, wherein the peristaltic hose 15 engages with the rotor of the peristaltic pump 20 when the frame 16 is received in the receiving section 23 and in the process extends with its curved course (Fig. 3) around the rotor axis.The receiving section 23 has a contour corresponding to the frame 16, so that the frame 16 can only be positively received in exactly one position and orientation on the receiving section 23 of the pump housing 20. The contour of the receiving section 23 can be provided, for example, by locking projections that engage in corresponding locking recesses on the frame 16. The frame 16 can thus simply be "clicked" into the receiving section 23. The frame 16 is rigid in order to specify the course of the peristaltic tube 15 as precisely as possible. This automatically ensures the exact positioning of the peristaltic tube 15 relative to the rotor of the peristaltic pump 20. However, the frame 16 should have sufficient elasticity to guarantee the locking function and to ensure that it does not break during handling and insertion into the receiving section 23.The peristaltic pump 20 has a support surface (not shown) in the region of the receiving section 23, which is provided for supporting the peristaltic hose 15, which is positioned radially between the rotor and the support surface by the frame 16. For pumping, the peristaltic hose 15 is elastically deformed in sections along its curved course circumferentially between the rotor and the support surface.

[0054] - Patent claims -

Claims

Patent claims 1. Tissue collection bag (1) for a morcellation system, comprising two outer layers (2, 3) of a flexible sheet-like structure made of a liquid-impermeable material enclosing an inner volume and connected to one another at their edges, an inlet connection (4) for supplying liquid carrying tissue particles, an outlet connection (5) for discharging the liquid, and a filter device for retaining the tissue particles in the inner volume, characterized by a three-layer structure in which at least one intermediate layer (6) of a flexible sheet-like structure made of liquid-permeable and impermeable material for the tissue particles, located between the two outer layers (2, 3), forms the filter device and divides the inner volume into at least two chambers (7, 8), wherein the inlet connection (4) opens into one chamber (7) and the outlet connection (5) opens into the other chamber (8).

2. Fabric collecting bag (1) according to claim 1, wherein the two outer layers (2, 3) and the at least one intermediate layer (6) are connected to one another, in particular sealed, wherein the intermediate layer (6) is connected at its edges (9, 10) to at least one of the outer layers (2, 3).

3. Fabric collecting bag (1) according to claim 2, wherein the at least one intermediate layer (6) is connected at least one of its edges (10) to the outer layer (2) in a region outside at least one of the edges (9) of this outer layer (2).

4. Fabric collecting bag (1) according to one of claims 1 to 3, wherein the fabric collecting bag (1) is provided on at least one of its edges (10) has a holding device (11), in particular in the form of a hook or an eyelet.

5. Fabric collecting bag (1) according to one of claims 1 to 4, wherein the at least one partial surface of the at least one intermediate layer (6) is formed by a net or a grid film 6. Fabric collection bag (1) according to one of claims 1 to 5, wherein the inlet and / or outlet connection (4, 5) can each be closed reversibly in a fluid-tight manner by means of a closure element.

7. Fabric collection bag (1) according to one of claims 1 to 6, wherein at least one of the outer layers (3) has a rigidity sufficient for the fabric collection bag (1) to assume an unfolded, flatly spread-out configuration without the action of external forces.

8. Fabric collection bag (1) according to one of claims 1 to 7, wherein one of the outer layers (2, 3) has on the outside a downwardly open pocket (12) extending substantially over the entire width of the outer layer (2, 3), intended to receive therein a holder (13) which holds the fabric collection bag (1) upright and in an unfolded, flatly spread-out configuration.

9. Fabric collection bag (1) according to claim 8, wherein the two outer layers (2, 3) and the pocket (12) are formed from a single blank (14) of the liquid-impermeable material, which are connected to one another, in particular sealed, at their edges (9, 10) after the blank (14) has been folded over twice.

10. Tissue collection bag (1) according to one of claims 1 to 9, wherein the inlet connection (4) is designed as a multiple connection, provided for the selective supply of the tissue particle-carrying liquid or another liquid, in particular a disinfectant, Sterilization or preservation liquid, or for removing tissue particles from the internal volume of the tissue collection bag (1).

11. Hose system for a peristaltic pump (20), with a peristaltic hose (15) and a support, wherein the support is designed as a frame (16) with holding elements (17, 18) which hold the peristaltic hose (15) in an arcuate course in the frame (16).

12. Hose system according to claim 11, wherein the carrier is designed for reversible reception on a peristaltic pump (20), wherein the peristaltic hose (15) engages with a rotor of the peristaltic pump (20) that is rotatable about a rotor axis when the carrier is received on the peristaltic pump (20) and thereby extends with its arcuate course around the rotor axis.

13. Hose system according to claim 11 or 12, wherein the frame (16) has a U-shape and at the free end of each U-leg and in the region of the U-bend has a holding element (17, 18) holding the peristaltic hose (15).

14. Hose system according to one of claims 11 to 13, wherein the carrier has at least one position marker for detecting the correct position on the peristaltic pump (20) and / or an identification element for automatically identifying the hose system.

15. Hose system according to one of claims 11 to 14, with a tissue collection bag (1) according to one of claims 1 to 10, wherein the peristaltic hose (15) is firmly connected or detachably connectable at its pressure-side end to the inlet connection (4) of the tissue collection bag (1).

16. Peristaltic pump (20) with a pump housing (21), a rotor and a motorized rotor drive, wherein the peristaltic pump (20) a receiving section (23) which is designed to receive a carrier of a hose system according to one of claims 11 to 15 17. Peristaltic pump (20) according to claim 16, wherein the peristaltic pump (20) has a support surface in the region of the receiving section (23) which, when the carrier is received on the receiving section (23), is provided for supporting the peristaltic hose (15) of the hose system which is positioned radially between the rotor and the support surface by the carrier, wherein the peristaltic hose (15) is elastically deformable in sections between the rotor and the support surface under the mechanical action of the rotating rotor for pumping the liquid carrying tissue particles.

18. Peristaltic pump (20) according to claim 16 or 17, with at least one sensor which is provided for detecting the correct position of the carrier on the receiving section (23).

19. Peristaltic pump (20) according to one of claims 16 to 18, with at least one reading device provided for reading an identification element of the carrier.

20. Peristaltic pump (20) according to one of claims 16 to 19, wherein the peristaltic pump has a holder (13) provided to hold a tissue collection bag (1) according to one of claims 1 to 10 on the peristaltic pump (20). - Summary -

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