Anastomosis device for connecting two hollow organs, and method for use of the anastomosis device

Abstract

The present invention relates to an anastomosis device for connecting two hollow organs, to a tool for dilating hollow organs when using the anastomosis device, and to an anastomosis method for use of the anastomosis device. The anastomosis device comprises a main body having a hollow cylindrical shape, which is open at both end faces, has a continuous cut along the longitudinal axis and is elastically deformable with respect to its diameter, and holding means in the region of at least one cut edge, formed along the longitudinal axis by the continuous cut, of the main body for manually changing the diameter of the main body in order, with a first, larger diameter, to insert a hollow-organ segment into the main body and, with a second, smaller diameter, to place at least one overhang, projecting beyond an end face of the main body, of the inserted hollow-organ segment over this end face of the main body and thereabove a hollow-organ end of one of the two hollow organs to be connected.

Description

Anastomosis device for connecting two hollow organs and method for using the anastomosis device

[0001] The present invention relates to an anastomosis device for connecting two hollow organs and a method for using the anastomosis device. The invention further relates to a tool for dilating hollow organs.

[0002] An anastomosis is a natural or artificial connection between two or more separate vessels of the same type, especially between hollow organs such as blood and lymph vessels, muscular hollow organs, vas deferens / spermic cords, etc. To this day, the most common vascular anastomoses in plastic and reconstructive surgery as well as in vascular surgery are sewn by hand according to the technique developed by A. Carrel in 1902. This technique is very demanding, requires years of training and demands a high level of skill from the surgeon.

[0003] Performing a hand-sewn vascular anastomosis is time-consuming and expensive, requiring specialized operating rooms, equipment, and personnel, making this highly sought-after procedure difficult or impossible to perform in many hospitals. As a result, anastomosis devices have been developed to replace and simplify the hand-sewn procedure.

[0004] In known anastomosis devices, at least one connecting element is placed on at least one hollow organ end to be connected and connected either directly or by another connecting element to a second hollow organ end, whereby the placed hollow organ end often has to be secured by an additional fastening means.

[0005] US 9642623 B2 discloses methods, devices, apparatus, assemblies, and kits for performing a vascular anastomosis. The vascular anastomosis device comprises tissue-engaging members that can move between at least two configurations. In some embodiments, the tissue-engaging portions move without the aid of moving parts, while in other embodiments, the tissue-engaging portions extend from one or more movable wings. The tissue-engaging portions may be separated by a first distance when in a pre-deployment configuration and by a second distance when in a deployed configuration. The method comprises engaging a plurality of tissue-engaging elements of a coupling device with a first end tissue.After selective engagement of the tissue-engaging elements and the first end fabric, the first end fabric is stretched by at least one movement of the tissue-engaging elements. The stretched first end fabric is joined to the second end fabric by connecting the coupling device to a suitable anastomosis device.

[0006] Current anastomosis devices often feature complex and cumbersome instrumentation, rigid structures, and inflexible techniques with regard to vascular discrepancies. They are permanently exposed to the bloodstream, increasing the risk of inflammation, thrombosis, and myointimal hyperplasia, or provide inadequate clinical outcomes. Furthermore, the entire anastomosis process takes place during surgery, making the procedure lengthy and costly.

[0007] Against this background, the present invention is based on the object of creating an anastomosis device for connecting hollow organs such as blood vessels, ureters, fallopian tubes, or the intestine, which avoids one or more disadvantages of known anastomosis devices. Preferably, the connection of these hollow organs should be possible, if possible without a microscope, in an effective, simple, seamless, and time-saving manner, and the anastomosis device should be usable in such a way that it does not come into permanent contact with the bloodstream or the endothelium of the hollow organ.

[0008] According to one aspect of the present invention, an anastomosis device for connecting two hollow organs is provided, comprising a base body having a hollow, cylindrical shape which is open at both ends, has a continuous cut along the longitudinal axis and is elastically deformable with respect to its diameter, and Holding means in the region of at least one cutting edge of the base body formed along the longitudinal axis by the continuous cut for manually changing the diameter of the base body in order to insert a hollow organ segment into the base body at a first larger diameter and to put at least one overhang of the inserted hollow organ segment projecting beyond a front end of the base body over this front end of the base body and a hollow organ end of one of the two hollow organs to be connected at a second smaller diameter.

[0009] According to a further aspect of the present invention, a method of using the anastomosis device is provided, comprising the following steps: Inserting a hollow organ segment into the base body at the first larger diameter of the base body, and Slipping at least one overhang of the inserted hollow organ segment projecting beyond a front end of the base body over this front end of the base body with a second smaller diameter of the base body, wherein the holding means are used to change the diameter of the elastically deformable base body from the first to the second diameter or from the second to the first diameter.

[0010] Preferred embodiments of the invention are defined in the dependent claims.

[0011] The invention is based on the idea of cleverly designing an anastomosis device so that it can not only be manufactured easily and cost-effectively, but also be used to connect two hollow organs more effectively, safely, and in a more time-efficient manner. In particular, the invention also enables a suture-free anastomosis, which reduces the duration of the operation and the surgeon's workload by shortening the required work steps and the duration of the operation.

[0012] The present anastomosis device has the advantage, among other things, that a key step of the anastomosis process can optionally be performed outside the patient's body (ex vivo) by a specialist before or during the operation. The hollow organ segment that is inserted into the base body can be a hollow organ interposition (in particular an autologous transplant) or an artificial interposition, whereby both overhangs of the inserted hollow organ segment that protrude beyond the respective frontal end of the base body, also referred to as hollow organ segment ends, are slipped over the respective frontal end of the base body, over which one hollow organ end of one of the two hollow organs to be connected is subsequently slipped. This can reduce the patient's treatment time and the surgeon's working time.

[0013] Another option is that the hollow organ segment that is inserted into the base body is one of the hollow organs to be connected. The overhang of the inserted hollow organ segment protruding from the front end of the base body is slipped over this front end of the base body, over which the second hollow organ end of the hollow organ to be connected is then slipped. One of the advantages of this option is the use of existing structures in the patient's body without the need for a hollow organ interposition.

[0014] In particular, the compact design, the enabling of laminar blood flow and the absence of platelet aggregation inhibitors can drastically improve the patency rate of such operations, as the method according to the invention becomes standardized and less time-consuming, thus making anastomoses more available and safer worldwide.

[0015] In a preferred embodiment, the first larger diameter of the base body represents an initial state of the base body, in which the base body is not elastically deformed, the cut edges are spaced apart along the cut, and the base body is open. This allows a hollow organ segment to be inserted into the base body directly in its initial state, without manually changing the diameter using the holding means.

[0016] The holding means can be configured such that the diameter of the base body is reduced to the second, smaller diameter by applying mechanical force via the holding means, thereby bringing the base body into an assembly state in which the base body is elastically deformed and the cut edges are in an overlapping or parallel position. This enables the simple insertion of at least one hollow organ segment end over this front end of the base body and the subsequent insertion of a hollow organ end of one of the two hollow organs to be connected over it.

[0017] Preferably, the base body is designed to increase the diameter of the base body after the application of mechanical force has ended and to bring the base body into a final state. This ensures that the hollow The end of the organ segment and the hollow organ end of one of the two hollow organs to be connected are automatically fixed to the base body by increasing the diameter of the base body and without any further action by the surgeon.

[0018] In an alternative embodiment, the second, smaller diameter of the base body represents an initial state in which the base body is not elastically deformed, the cut edges along the cut are in an overlapping or parallel position relative to one another, and the base body is closed. After the hollow organ segment has been inserted into the base body, this enables the insertion of at least one hollow organ segment end over this front end of the base body, and the subsequent insertion of a hollow organ end of one of the two hollow organs to be connected over it.

[0019] The holding means can be designed in such a way that the diameter of the base body is increased by applying mechanical force via the holding means and the base body is thereby brought into an assembly state in which the base body is elastically deformed and the cutting edges are at a distance from one another, whereby a hollow organ segment can be inserted into the base body.

[0020] The holding means may comprise one or more holding elements, in particular one or more radially projecting projections and / or notches and / or bulges and / or holes, in the region of the outer surface of the base body. This allows the diameter of the elastically deformable base body to be manually changed from the first to the second diameter and / or from the second to the first diameter in a simple manner and using simple tools such as pliers, tweezers, or other gripping tools.

[0021] In a further embodiment, it is provided that the holding means in the region of each of the cutting edges each have a holding element projecting in the radial direction, wherein one of the holding elements is arranged set back in the circumferential direction relative to the cutting edge and the cutting edge is interrupted there in the longitudinal direction, whereby the base body has an overlap of the two edges when the diameter is reduced. The opposing retaining element is preferably arranged directly on the cutting edge and can thus engage in the interrupted area of the other cutting edge when the diameter of the base body is reduced.

[0022] Preferably, the material thickness is configured such that the base body decreases progressively at one of the cutting edges in the circumferential direction toward the cutting edge. This allows for greater flexibility in reducing the diameter of the base body by applying mechanical force via the holding means to the second, smaller diameter.

[0023] A further embodiment may further comprise at least one fastening ring for fixing the overturned hollow organ segment end and the hollow organ end placed over it on the base body, whereby additional security is achieved against loosening of the overturned overhang of the hollow organ segment and the hollow organ end placed over it of one of the two hollow organs to be connected.

[0024] In the area of the front ends of the base body, one or more securing prongs, particularly directed toward the holding means, can be attached to secure the overlaid hollow organ segment end and the overlaid hollow organ end of one of the two hollow organs to be connected. These securing prongs can penetrate the overlaid overhangs and thus hold them in position.

[0025] According to a further aspect of the present invention, a tool for dilating hollow organs is provided, comprising: a dilator having a cylindrical shape which is open at both front ends, has a continuous cut along the longitudinal axis and is elastically deformable with respect to its diameter, and a clamping element having two connecting elements whose first ends are attached to the dilator at different locations, in particular at different points of a front end, in order to change the diameter of the dilator by changing the distance between the first ends.

[0026] The tool can be advantageously used in anastomosis procedures using the anastomosis device according to the invention or the anastomosis method according to the invention, for example to insert the tool into the end of a hollow organ when the dilator has a smaller diameter and to place this hollow organ end over another hollow organ (end) and / or the anastomosis device according to the invention when the dilator has a larger diameter.

[0027] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0028] Embodiments of the invention are illustrated in the following drawings and explained in more detail in the following description. They show: Fig. 1 is a schematic representation of a first embodiment of the anastomosis device according to the invention in an initial state; Fig. 2 is a schematic representation of the anastomosis device shown in Fig. 1 with an inserted hollow organ segment; Fig. 3 is a schematic representation of the anastomosis device shown in Fig. 1 in an assembled state with a gripping tool; Fig. 4 is a schematic representation of the anastomosis device shown in Fig. 1 with two hollow organ segment ends slipped over the front ends of the base body; Fig. 5 is a schematic representation of the anastomosis device shown in Fig. 1 with the hollow organs to be connected; Fig. 6 is a schematic representation of the anastomosis device shown in Fig. 1 in the final state; Fig. 7 is a schematic representation of a second embodiment of the anastomosis device according to the invention with a modified arrangement of the holding means; Fig. 8 is a schematic representation of a third embodiment of the anastomosis device according to the invention in an initial state; Fig. 9 is a schematic representation of the anastomosis device shown in Fig. 7 with two fixing rings; Fig. 10 is a schematic representation of the anastomosis device shown in Fig. 7 with securing tip areas; Fig. 11 is a schematic representation of a fourth embodiment of the anastomosis device according to the invention with a modified design of the holding means with a gripping tool; Fig. 12 is a schematic representation of the anastomosis device shown in Fig. 1 with an inserted hollow organ; Fig. 13 a tool for dilating hollow organs during anastomosis procedures; and Fig. 14 is a flow chart of an embodiment of the anastomosis method according to the invention for using the anastomosis device according to the invention.

[0029] Fig. 1 shows a schematic representation of a first embodiment of the anastomosis device 1 according to the invention in an initial state. The anastomosis device- Device 1 comprises an elongated, hollow, and cylindrically shaped base body 10 made of biocompatible and / or biodegradable material, which is open at both ends 12, 13 and elastically deformable with respect to its diameter. The base body 10 further comprises an outer surface 11 and a continuous cut along the longitudinal axis. Holding means 20, 21 projecting in the radial direction are attached approximately centrally in the longitudinal direction to the cut edges 14, 15 formed by the cut. In this embodiment, the holding means 20, 21 are designed as elongated, curved handles that are (optionally) curved, with their curvature directed away from the respective cut edges 14, 15.

[0030] In the first embodiment shown, the base body has a first, larger diameter of the base body 10 in the initial state compared to an assembled state and a final state, as described in more detail below. This means that the base body assumes this initial state without the application of force. The cutting edges 14, 15 are spaced apart (in the circumferential direction of the base body) and form a gap 16 between them. The holding means 20, 21 enable a manual reduction of the diameter of the base body 10 and a closing of the gap 16.

[0031] Fig. 2 shows a schematic representation of the anastomosis device 1 shown in Fig. 1 with an inserted hollow organ segment 3. In the present example, the hollow organ segment is a hollow organ interposition that was previously removed from the patient. This hollow organ segment 3 was simply inserted into the base body 10 through the gap 16 between the two cut edges 14, 15. The hollow organ segment 3 is longer than the base body 10, so that one hollow organ segment end 30 (also referred to as the "overhang") protrudes beyond one end face 12 of the base body 10, and the other hollow organ segment end 31 protrudes beyond the other end face 13 of the base body 10.

[0032] Fig. 3 shows a schematic representation of the anastomosis device 1 shown in Fig. 1, with inserted hollow organ segment 3, in an assembled state with a gripping tool 2. The diameter of the base body 10 was determined by applying me- mechanical force via the holding means 20, 21 with the gripping tool 2, thereby reducing the diameter to the second, smaller diameter, and the base body 10 is thereby brought into the assembled state. The gripping tool 2 can be tweezers, as shown. However, the holding means can also be gripped by other surgical instruments such as forceps, clamps, or scissors, or alternatively, directly with the fingers, in order to reduce the diameter of the base body 1.

[0033] Fig. 4 shows a schematic representation of the anastomosis device 1 shown in Fig. 1 with two hollow organ segment ends 30, 31 slipped over the front ends 12, 13 of the base body 10. One hollow organ segment end 30 is slipped over one front end 12 and the other hollow organ segment end 31 is slipped over the other front end 13 of the base body 10 onto the outer surface 11 of the base body 10. This is preferably done manually, if necessary with the aid of a tool with which the respective hollow organ segment end is slightly widened for slipping over. During this process step, the base body 10 remains in the assembled state, for example by continuing to grip the handles 20, 21 using a tool 2, so that the hollow organ segment ends 30, 31 can be more easily slipped over the ends 12, 13 of the base body 10.Optionally, the base body 10 has a roughening on its outer surface 11 in the area of the front ends 12, 13 for better fixation and durability of the overlaid hollow organ segment ends 30, 31.

[0034] When using a hollow organ interposition, the method steps shown in Figures 2 to 4 can optionally be carried out outside the patient's body (ex vivo) by a specialist before or during the operation. For the actual operation to connect the two hollow organs, the anastomosis device 1 is then prepared in the state shown in Figure 4 and inserted as described below. Optionally, the base body 10 can also be held in the assembled state by external force application via the holding means 20, 21. If necessary, the force applied by the overlaid hollow organ segment ends 30, 31 is also sufficient to (essentially) hold the base body 10 in this assembled state and to prevent its diameter from increasing significantly due to its elastic properties.

[0035] Another option for securing the anastomosis device 1 in the reduced diameter is a locking connection attached to the base body 10. In its closed state, it permanently holds the two adjacent or overlapping cut edges 14, 15 in the assembled state, and no additional gripping tool 2 is required. By opening the locking connection, the diameter of the base body 10 can be increased again.

[0036] Fig. 5 shows a schematic representation of the anastomosis device 1 shown in Fig. 1 with the hollow organs 4, 5 to be connected. The aim of the hollow organ anastomosis is to achieve a connection between one hollow organ end 40 of one hollow organ 4 and the other hollow organ end 50 of the other hollow organ 5, for example because the hollow organs 4, 5 were severed for medical reasons or unintentionally due to an accident. For this purpose, one hollow organ end 40 is slipped over one (already slipped over) hollow organ segment end 30 and the other hollow organ end 50 is slipped over the other (already slipped over) hollow organ segment end 31. Here, too, the hollow organ ends 40, 50 are expanded, if necessary manually or with the aid of a tool. This and all subsequent procedural steps involving the hollow organs 4, 5 to be connected are carried out on the patient during the operation.

[0037] Fig. 6 shows a schematic representation of the anastomosis device 1 shown in Fig. 1 in its final state. After the application of mechanical force via the holding means 20, 21, possibly automatically and without further intervention by the surgeon due to the elastic properties of the base body 10, the diameter of the base body 10 has increased slightly again compared to the assembled state, whereby the base body 10 has been brought into its final state. However, it can also happen that the force applied by the overturned hollow organ segment ends 30, 31 and the overturned hollow organ ends 40, 50 is so great that the diameter increases only slightly or almost not at all, and the diameter of the base body 10 in the assembled state essentially corresponds to the diameter of the base body 10 in the final state. In any case, the overturned hollow organ segment ends 30, 31 and the overturned hollow organ ends 40, 50 are fixed to the outer surface 11 of the base body 10 by the restoring force of the base body 10. The connection between the hollow organs 4, 5 is thus achieved and the hollow organ anastomosis is completed.

[0038] Fig. 7 shows a schematic representation of a second embodiment of the anastomosis device 1 according to the invention with a modified arrangement of the holding means 20, 21 in the initial state. One holding means 20 is arranged circumferentially offset from the cutting edge 15, and the cutting edge 14 is interrupted there in the longitudinal direction. The opposite holding means 21 is arranged directly on the cutting edge 14. This allows the holding means 21 to engage in the interrupted area of the other cutting edge 15 when the diameter of the base body 10 is reduced in order to bring it into the assembled state. Furthermore, the cutting edges 14, 15 can overlap when the diameter of the base body 10 is reduced.

[0039] Fig. 8 shows a schematic representation of a third embodiment of the anastomosis device 1 according to the invention in the initial state. This embodiment corresponds to the first embodiment with regard to the individual components, wherein in this embodiment the initial state has a second, smaller diameter of the base body 10. The cutting edges 14, 15 are in an overlapping state. The holding means 20, 21 enable a manual enlargement of the diameter of the base body 10 and a formation of the gap in order to bring the base body 10 into a state shown in Fig. 1 in order to introduce a hollow organ segment into the base body, as shown in Fig. 2. The method steps explained with reference to Figs. 3 to 6 are then carried out.

[0040] Fig. 9 shows a schematic representation of a fourth embodiment of the anastomosis device 1 according to the invention with two fastening rings 60, 61. These fastening rings 60, 61 are arranged on the hollow organ segment ends and the hollow organ ends after being slipped over during the hollow organ anastomosis. This fixes these slipped overs to the outer surface 11 of the base body 10 and provides additional support to reliably prevent the slipped over ends from slipping off the base body.

[0041] Fig. 10 shows a schematic representation of a fifth embodiment of the anastomosis device 1 according to the invention with securing tip regions 70, 71 in the region of the front ends of the base body on its outer surface 11. The securing tip regions 70, 71 each have one or more securing tips. These are preferably oriented in the direction of the holding means 20, 21 in order to penetrate the hollow organ segment ends and the hollow organ ends after being slipped over. This also reliably fixes these slipped over portions to the outer surface 11 of the base body 10 and provides additional support to reliably prevent the slipped over ends from slipping off the base body.

[0042] Fig. 11 shows a schematic representation of a sixth embodiment of the anastomosis device 1 according to the invention with a modified design of the holding means 22, 23. The holding means are realized here by slots on the outer surface 11 of the base body 20. A gripping tool 2 can engage therein and manually change the diameter of the base body. The holding means can also be designed differently, for example in the form of one or more holes and / or projections. The holding means can also be arranged only in the region of one cutting edge, which can generally be sufficient to change the diameter of the base body. Furthermore, the holding means can also be designed differently in the region of the two cutting edges.

[0043] Fig. 12 shows a schematic representation of the anastomosis device 1 according to the invention shown in Fig. 1 with an inserted hollow organ 4. Instead of a hollow organ interposition, as in the use of the anastomosis device 1 explained with reference to Figs. 1 to 6, one of the hollow organs to be connected, here the hollow organ 4, is used directly for the hollow organ anastomosis and thus represents the hollow organ segment inserted into the base body. The hollow organ end 40 of the hollow organ 4 is slipped over a front end 13 onto the outer side 11 of the base body 10. This makes it possible to slip the second hollow organ 5 to be connected (not shown in Fig. 12) over it in order to complete the hollow organ anastomosis. In this embodiment, the use of a hollow organ interposition is therefore not necessary. Furthermore, the process of slipping the end of a hollow organ over takes place only at one front end of the base body 10.

[0044] Fig. 13 shows a tool 6 for dilating hollow organs, for example during anastomosis procedures. Instead of conventional forceps, such a tool can also be used to attach the anastomosis device. In the exemplary embodiment shown, it has a clamping element 80 and a dilator 90. The dilator has a cylindrical shape that is open at both ends, has a continuous cut along the longitudinal axis, and is elastically deformable with respect to its diameter. The clamping element 80 is designed like forceps in the present case and has two connecting elements 81, 82, the first ends of which are attached to the dilator at different locations in order to change the diameter of the dilator by changing the distance between the first ends. In the embodiment shown, the first ends are attached to different points on a front end 91 (a ring edge 91) of the dilator.The second ends of the two connecting elements 81, 82 are firmly connected to each other.

[0045] To use the tool 6, the diameter of the dilator 90 can be reduced via the clamping element 80, thus enabling insertion into a hollow organ end. After the dilator 90 has been placed in a hollow organ end, the diameter is enlarged again. The hollow organ end can then be placed over another hollow organ (end) and / or the anastomosis device 1, and the tool 6 can subsequently be removed again.

[0046] As described above, the shape of the base body has a continuous cut along the longitudinal axis. The cut can (but does not have to) run along a straight line. Alternatively, the cut can run along a line that deviates from a straight line, for example along a wavy line (serpentine line), jagged line, or any other type of line, provided that the diameter of the base body can be changed. Preferably, the diameter should be able to be changed to such an extent that the hollow organ segment, with the enlarged diameter, can be inserted into the base body through the slot formed by the cut. Alternatively, with the enlarged diameter, the hollow organ segment can be pushed into the base body from one end of the base body and thus inserted.

[0047] As further described above, the holding means are arranged in the region of at least one cutting edge of the base body formed along the longitudinal axis by the continuous cut. The holding means can thus be arranged directly at the cutting edges or adjacent to the cutting edges, or at a distance from the cutting edges, provided they allow manual adjustment of the diameter of the base body.

[0048] Fig. 14 shows a flowchart of the method 100 according to the invention for using the anastomosis device. In the first step 101, a hollow organ segment 3 is inserted into the anastomosis device 1 (see Fig. 2). After reducing the diameter of the base body 10 by means of the holding means 20, 21, in the second step 102, the hollow organ segment ends 30, 31 are slipped over the respective front ends 12, 13 of the base body 10 (see Fig. 4). Subsequently, in the third step 103, the respective hollow organ ends 40, 50 of the hollow organs 4, 5 to be connected are slipped over the respective hollow organ segment ends 30, 31 on the patient (see Fig. 5) and fixed to the outer surface 11 of the base body 10 by releasing the holding means 20, 21 and automatically increasing the diameter (see Fig. 6). The hollow organ anastomosis is now complete.As already mentioned above, the first two steps can optionally be carried out before or during the operation by a specialist outside the patient's body (ex vivo) if a hollow organ interposition, e.g. an autologous transplant or an artificial interposition, is used as a hollow organ segment.

[0049] According to a further aspect, the present disclosure also relates to an anastomosis device for connecting two hollow organs, comprising a base body having a hollow, cylindrical shape which is open at both end faces and is elastically deformable with respect to its diameter, and holding means on the base body for manually changing the diameter of the base body in order to insert a hollow organ segment into the base body at a first larger diameter and, at a second smaller diameter, to fold at least one overhang of the inserted hollow organ segment projecting beyond an end face of the base body over this end face of the base body and, thereover, a hollow organ end of one of the two hollow organs to be connected.

[0050] Furthermore, the present disclosure also relates to an anastomosis system comprising an anastomosis device according to the present disclosure and a tool for dilating hollow organs according to the present disclosure.

[0051] The embodiments of the anastomosis device and method according to the invention described above and shown in the figures are to be understood merely as examples. Various modifications are conceivable with regard to the specific design, arrangement, and number of elements.

Claims

Patent claims 1. Anastomosis device for connecting two hollow organs with a base body which has a hollow, cylindrical shape which is open at both ends, has a continuous cut along the longitudinal axis and is elastically deformable with respect to its diameter, and Holding means in the region of at least one cutting edge of the base body formed along the longitudinal axis by the continuous cut for manually changing the diameter of the base body in order to insert a hollow organ segment into the base body at a first larger diameter and, at a second smaller diameter, to put at least one overhang of the inserted hollow organ segment projecting beyond a front end of the base body over this front end of the base body and over this a hollow organ end of one of the two hollow organs to be connected.

2. Anastomosis device according to claim 1, wherein the first larger diameter of the base body represents an initial state of the base body in which the base body is not elastically deformed and the cut edges along the cut are at a distance from one another and the base body is open.

3. Anastomosis device according to claim 2, wherein the holding means are designed to reduce the diameter of the base body to the second smaller diameter by applying mechanical force via the holding means and thereby bring the base body into an assembled state in which the base body is elastically deformed and the cut edges are in an overlapping or parallel position.

4. Anastomosis device according to claim 3, wherein the base body is configured to increase the diameter of the base body after the application of mechanical force has ceased and to bring the base body into a final state.

5. Anastomosis device according to claim 1, wherein the second smaller diameter of the base body represents an initial state in which the base body is not elastically deformed and the cut edges along the cut are in an overlapping or parallel position to one another and the base body is closed.

6. Anastomosis device according to claim 5, wherein the holding means are designed to increase the diameter of the base body by applying mechanical force via the holding means and thereby bring the base body into an assembled state in which the base body is elastically deformed and the cut edges are at a distance from one another.

7. Anastomosis device according to one of the preceding claims, wherein the holding means comprise one or more holding elements, in particular one or more projections and / or notches and / or bulges and / or holes projecting in the radial direction, in the region of the outer surface of the base body.

8. Anastomosis device according to one of the preceding claims, wherein the holding means in the region of each of the cutting edges each have a holding element projecting in the radial direction, wherein one of the holding elements is arranged set back in the circumferential direction relative to the cutting edge and the cutting edge is interrupted there in the longitudinal direction.

9. Anastomosis device according to one of the preceding claims, wherein the material thickness of the base body at one of the cutting edges decreases progressively in the circumferential direction towards the cutting edge.

10. Anastomosis device according to one of the preceding claims, further comprising at least one fastening ring for fixing the overhang of the hollow organ segment and the hollow organ end of one of the two hollow organs to be connected, which end is turned over, to the base body.

11. Anastomosis device according to one of the preceding claims, further comprising one or more securing tips arranged in the area of the outer surface of the base body, in particular aligned in the direction of the holding means, for fixing the overhang of the hollow organ segment and the hollow organ end of one of the two hollow organs to be connected, which end is placed over it.

12. A method for connecting two hollow organ ends with an anastomosis device according to one of the preceding claims, comprising the following steps: Inserting a hollow organ segment into the base body at the first larger diameter of the base body, and Slipping at least one overhang of the inserted hollow organ segment, which overhang projects beyond a front end of the base body, over this front end of the base body with a second smaller diameter of the base body, wherein the holding means are used to change the diameter of the elastically deformable base body from the first to the second diameter and / or from the second to the first diameter.

13. The method according to claim 12, wherein the hollow organ segment is a hollow organ interposition, an autologous transplant, or an artificial interposition.

14. The method according to claim 12 or 13, wherein the steps of inserting the hollow organ segment into the base body and fitting it over are carried out ex vivo.

15. Tool for dilating hollow organs, comprising: a dilator having a cylindrical shape which is open at both ends, has a continuous cut along the longitudinal axis and is elastically deformable with respect to its diameter, and a clamping element having two connecting elements, the first ends of which are attached to the dilator at different locations, in particular at different points on a front end, in order to change the diameter of the dilator by changing the distance between the first ends.

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