Occluder delivery system and delivery unit

Description

[0001] The invention relates to a system for introducing a self-expanding occluder into a patient and for releasing the occluder in the left auricle of the patient.

[0002] The atrial appendages, or atrial appendages, are outpouchings of the atria of the heart in mammals. The left atrial appendage, medically known as the left atrial appendage (LAA), lies adjacent to the pulmonary artery and is a common site of blood clot formation, particularly in patients with atrial fibrillation. Preventing thrombi in the left atrial appendage therefore represents effective stroke prophylaxis in patients at risk.

[0003] Implants have been developed for this stroke prevention purpose. These implants are inserted into the outflow tracts and close off the access, for example using a Teflon film. In English-speaking literature, these implants are referred to as LAA (Left Atrial Appendage) occluders. These implants are inserted into the outflow tracts and anchored there, in particular using anchoring elements, so that they seal off the access to the outflow tracts in a fluid-tight manner, particularly via their proximal end region. They are usually inserted using endovascular techniques, i.e., in particular using an insertion catheter through which the implant is delivered to the site of use. The occluders are delivered to the site of use, in particular in a volume-reduced form, and expanded there. Self-expanding materials, such as shape memory alloys, are generally used for the occluders. One such occluder is already known from WO 2015 / 079023 A1.

[0004] To insert an occluder into the left auricle of a patient, it is known to use a guide wire. The guide wire, as disclosed, for example, in WO 2015 / 079023 A1, is screwed onto an internal thread of the occluder using an external thread. The occluder is then brought to its intended position in the area of ​​the left auricle. Once the occluder has assumed its self-expanded shape at the intended location, the guide wire can be released from the occluder by unscrewing the guide wire. This can, in particular, result in undesirable torque acting on the occluder and, in the worst case, even lead to the occluder becoming detached from its intended position. Consequently, there is a need to remedy these disadvantages.

[0005] Furthermore, there is a need to be able to move an occluder as easily as possible into an insertion position, which can in particular be a compressed position, in order to bring the occluder to the left auricle in this insertion position.

[0006] Furthermore, it is known from DE 10 2009 020 012 A1 and US 5 201 757 A that a stent can be brought into its self-expanded form by an opposite movement of two elements of a catheter.

[0007] EP 2 266 465 A1 discloses an occlusion instrument, wherein no parts protrude beyond the proximal end of the occlusion instrument during insertion.

[0008] From US 2017 / 0056222 A1, a handling unit for inserting a prosthesis is known, wherein two elements of the handling unit can be rotated relative to each other so that an outer tube and an inner tube move translationally relative to each other and the shape expands from the gap that forms.

[0009] From WO 2006 / 036837 A2 an introduction system for a two-part occluder with an outer tube and an internally guided wire is known, wherein the outer tube interacts at its distal end with the proximal end of the occluder by means of an internal thread and the internally guided wire interacts at its distal end with the distal end of the occluder.

[0010] WO 2017 / 157316 A1 shows an introduction system for a foldable occluder with an outer tube and an inner tube, wherein the outer tube interacts with the proximal end of the occluder by means of an internal thread and the inner tube interacts with the distal end of the occluder by means of an external thread.

[0011] Published patent application WO 2006 / 036837 A2 discloses a system for introducing an occluder designed to close a patent foramen ovale. An inner tube of an insertion unit of the system is motion-coupled to a distal end of the occluder.

[0012] US Patent Application Publication No. 2007 / 0135826 A1 discloses a system for inserting an occluder designed to occlude the left auricle of a patient. A distal end of an outer tube of an insertion unit of the system is positioned within the occluder during insertion of the occluder.

[0013] The present invention is therefore based on the overall object of developing the known prior art.

[0014] This object is achieved by a system having the features of claim 1.

[0015] What is proposed is initially a system for inserting a self-expanding occluder into a patient and for releasing the occluder in the left auricle of the patient. The system comprises the occluder and an insertion unit with a drive unit and an insertion catheter, which comprises an outer tube and an inner tube extending through the outer tube. A proximal end region of the occluder is movement-coupled to the outer tube, while a distal end region of the occluder is movement-coupled to the inner tube, with a distal end of the outer tube being arranged within the occluder. The drive unit interacts with the inner tube and the outer tube of the occluder in such a way that, when actuated, the inner tube can be moved in the distal or proximal direction, and the outer tube can be moved in the proximal oris movable in a distal direction so that the proximal end and the distal end of the occluder can be moved away from or towards each other.

[0016] By coupling the movement of the proximal end of the occluder with the outer tube and the distal end of the occluder with the inner tube, the proximal end and the distal end of the occluder can be moved away from each other or towards each other. To insert the occluder into a patient and to guide the occluder to the left auricula cordis, the inner tube can therefore first be moved in the distal direction while the outer tube is moved in the proximal direction. This allows the proximal end and the distal end of the occluder to be moved away from each other in order to bring the occluder into an insertion position. In this insertion position, the occluder is therefore compressed, so that it has an increased length but a reduced diameter. This allows it to be guided towards the left auricula cordis, particularly through blood vessels.

[0017] To release the occluder in the left auricle, the inner tube can be moved proximally while the outer tube can be moved distally. This causes the proximal and distal ends of the occluder to move toward each other, with the occluder tending toward its self-expanding shape. The length of the occluder decreases while its diameter increases. During this release process, the occluder comes into contact with the left auricle, thus closing the left auricle with the occluder.

[0018] Overall, a change in the position of the occluder can be brought about in a particularly simple manner in order to transfer the occluder into an insertion position in which the occluder can be brought particularly easily to the left auricula cordis of a patient, and to be able to release the occluder, whereby the occluder strives in particular for its self-expanded form and tightly closes the left auricula cordis after release.

[0019] An advantageous development of the invention provides that the outer tube ends distally before the inner tube. This allows for a particularly simple coupling of the proximal end region of the occluder to the outer tube and the distal end region of the occluder to the inner tube.

[0020] A further advantageous embodiment of the invention provides that the occluder comprises a frame with a tubular proximal end region through which the insertion catheter is inserted into the occluder. In this way, the insertion catheter can be inserted into the occluder in a particularly simple manner. The distal end of the outer tube can be located in the distal direction immediately after the tubular proximal end region, so that the outer tube interacts in particular with the tubular proximal end region of the occluder for movement coupling. It is conceivable that the outer tube interacts with the tubular proximal end section in a form-fitting or force-fitting manner. Furthermore, the occluder strives in particular to its self-expanded shape, so that, starting from the insertion position, the occluder can support the movement into the expanded position through the intrinsic striving when the outer tube moves in the distal direction.

[0021] It is also advantageous if the occluder comprises a cup-shaped distal end region on which the inner tube of the insertion catheter is arranged. The distal end region of the inner tube can therefore in particular be inserted into the cup-shaped distal end region of the occluder and terminate therein. The cup-shaped distal end region therefore in particular comprises a circular cylindrical jacket section and a base section. Consequently, a movement coupling can be provided between the inner tube and the distal end region of the occluder, in particular in the distal direction. It is conceivable that the inner tube is arranged in a form-fitting or force-fitting manner in the distal cup-shaped end region. As a result, a movement coupling between the inner tube and the distal cup-shaped end region of the occluder can be provided even when the inner tube is moved in the proximal direction.Furthermore, the occluder strives particularly towards its self-expanded form, so that starting from the insertion position, the occluder can support the movement of the inner tube in the proximal direction by the intrinsic striving into the expanded position.

[0022] It is particularly preferred if the occluder can be transferred into an insertion position for insertion into a patient by a distal end of the inner tube and a distal end of the outer tube being movable away from one another relative to one another, such that the proximal end and the distal end of the occluder can be moved away from one another. In this insertion position, the occluder can in particular have a reduced diameter and thus be compressed. The occluder can have an increased length, such that in the insertion position the occluder has a reduced diameter but a greater length compared to the release position. In this insertion position, the occluder can be brought particularly easily closer to the left auricle.

[0023] It is particularly preferred if the distal ends of the inner tube and the outer tube can be moved toward one another to release the occluder, such that the proximal end and the distal end of the occluder can be moved toward one another. In this case, it is particularly conceivable that the occluder, during the release process, tends to assume its self-expanded form, so that, starting from the insertion position of the occluder, upon movement of the inner tube in the proximal direction or the outer tube in the distal direction, the occluder intrinsically tends toward the expanded position.

[0024] It can be provided that a central part of the occluder between the proximal end and the distal end retains its position essentially unchanged during the release of the occluder. In order to release the occluder at its intended position in the area of ​​the left auricula cordis, the distal ends of the inner tube and the outer tube are moved towards each other so that the proximal end and the distal end of the occluder also move towards each other. Because the occluder can be designed to be self-expanding, it can be provided in particular that the occluder strives for its self-expanded position during the release process. In the final position, the occluder can come into contact with an inner side of the left auricula cordis and tightly close the left auricula cordis, in order to reduce the risk of thrombus formation and the resulting risk of stroke.In the final position, the occluder can either assume its self-expanded final shape. However, it is also conceivable that the final position of the occluder, in which it reaches the left auricle cordis sealing position, is already reached before the self-expanded final shape is reached, and the occluder can then no longer deform.

[0025] It is conceivable for the occluder to have a central axis that extends through the proximal end region and the distal end region. The occluder can run around this axis. In the inserted position, the occluder can have a center point between the proximal end and the distal end along this axis. When the occluder is now released, it can be provided in particular that the proximal end and the distal end of the occluder are moved towards one another in such a way that the center point of the occluder maintains or essentially maintains its position. This can provide a particularly precise arrangement and release of the occluder on the left auricle. In its end position, the occluder can in particular have a spherical outer contour, so that the center point can also be the center point of the circular outer contour.

[0026] It is further particularly preferred if the drive unit has a first transmission element with a first transmission thread, a second transmission element with a second transmission thread, and an actuating element actuatable by an operator with a first drive thread and a second drive thread. The first transmission element is movement-coupled to the inner tube. The second transmission element is movement-coupled to the outer tube. The first drive thread interacts with the first transmission thread, while the second drive thread interacts with the second transmission thread to move the distal ends of the outer tube and the inner tube towards or away from each other. In this way, a movement coupling between the drive unit and the outer tube or inner tube of the insertion catheter can be provided in a particularly simple manner.The first and second drive threads can be formed as a single piece. In particular, the actuating element can be formed as a single piece. Upon actuation of the actuating element, the distal ends of the outer tube and the inner tube can be moved toward or away from each other simultaneously. It can be provided that the first transmission thread and the second transmission thread, as well as the first and second drive threads, are formed synchronously such that upon actuation of the actuating element, the inner tube and the outer tube are each displaced by the same distance in opposite directions.

[0027] Advantageously, the first drive thread is designed as a first internal thread, which interacts with the first transmission thread, which is designed as an external thread. Furthermore, the second drive thread is advantageously designed as a second internal thread, which interacts with the second transmission thread, which is designed as an external thread. The first and second drive threads can be formed integrally with one another. Overall, this allows for a particularly simple coupling of motion and synchronous movement in opposite directions.

[0028] Preferably, the outer tube has at least one, in particular two or more, locking finger-like portions at its distal end region, which interact with the proximal end region of the occluder to couple the movement. In this way, a particularly simple movement coupling can be realized. The locking finger-like portion can interact, in particular, with the tubular proximal end section of the occluder and engage behind it, in particular, to couple the movement during a movement in the proximal direction. The outer tube can, in particular, be formed as a single piece.

[0029] A particularly preferred development of the invention results from the fact that the first transmission element interacts with a Luer connector arranged on the inner tube for coupling movement with the inner tube. A Luer connector can therefore be arranged on the inner tube. This can, for example, be arranged on the first transmission element for coupling movement.

[0030] A particularly preferred development of the invention provides that the locking finger-like section is arranged in a form-fitting manner at the proximal end region of the occluder when the inner tube is arranged in the occluder. In particular, it can be provided that the locking finger-like section is designed to be elastically flexible and, starting from a rest position, is deflected from the rest position after the inner tube has been inserted through the outer tube. When the inner tube is consequently guided through the outer tube, it can be provided that the locking finger-like section cannot deflect radially inward, thus providing a stable form-fitting connection between the proximal end region of the occluder and the locking finger-like section.

[0031] It is particularly preferred if, in order to remove the delivery catheter from the occluder, the inner tube can first be removed from the occluder. Once the inner tube has been removed from the occluder through the outer tube, the outer tube can then be removed from the occluder.

[0032] Consequently, it can be provided that the positive connection between the outer tube and the proximal end region of the occluder can only be released once the inner tube has been withdrawn from the occluder through the outer tube. As explained above, the distal end and the proximal end of the occluder can be moved toward each other by means of the outer tube and the inner tube to release the occluder. This forces the occluder into its self-expanding shape.

[0033] Once this process of moving the proximal and distal ends of the occluder toward each other is complete, the delivery catheter can be withdrawn from the occluder in a particularly simple manner by first withdrawing the inner tube from the occluder through the outer tube. The outer tube can then be withdrawn from the occluder, whereby, in particular, the locking finger-like section at the distal end of the outer tube can be elastically displaced radially inward in order to withdraw the outer tube from the tubular proximal end section of the occluder.

[0034] This procedure can therefore essentially completely or even completely prevent undesired torque transmission from the delivery catheter to the occluder. This minimizes or eliminates the risk of the occluder being dislodged from its intended position at the left auricle when the delivery catheter is removed from the occluder. After removal of the delivery catheter, the occluder can fully expand into its self-expanded shape, thereby completely sealing the left auricle in a fluid-tight manner.

[0035] Advantageously, the insertion unit comprises a housing that can be held by an operator, with the transmission elements and the actuating element being arranged in or on the housing. An operator, for example a surgeon, can thus hold the housing in their hand, so that the housing can be designed like a handle. The transmission elements and / or the actuating element can be arranged in or on the housing.

[0036] Preferably, the actuating element is rotatably mounted on the housing. The housing may have a central longitudinal axis, and the actuating element may be rotatable about the central longitudinal axis. The actuating element may, in particular, be formed in one piece and, in particular, be hollow-cylindrical with an internal thread.

[0037] Further details and advantageous embodiments of the invention can be found in the following description, which describes and explains in more detail the embodiment of the invention shown in the figures. They show: Figure 1 schematic top view of an occluder arranged on the left auricle according to an embodiment; Figure 2 schematic perspective view of the occluder according to Figure 1 ; Figure 3 Top view of one half of the occluder according to Figure 2 ; Figure 4 cutaway schematic representation of a frame section of the occluder according to Figure 2 ; Figure 5 perspective schematic representation of an insertion unit according to an embodiment; Figure 6 schematic cross-sectional representation of the insertion unit according to Figure 1 with occluder arranged thereon in insertion position; Figure 7 schematic cross-section of the insertion unit according to Figure 1with the occluder arranged thereon in a configuration prior to removal of the insertion unit from the occluder. Figure 8 Schematic cross-section of an area around the proximal end of the occluder with the insertion unit arranged thereon; Figure 9 Illustration based on Figure 8 , with the inner tube of the introducer unit removed from the occluder; and Figure 10 Illustration of a proximal region of the introducer unit with the Luer connector detached from the introducer unit.

[0038] Figure 1 10 schematically shows the left auricula cordis of a patient. To reduce the risk of stroke, an occluder 12 is inserted into the left auricula cordis 10 to close the access to the left auricula cordis 10.

[0039] The occluder 12 comprises a one-piece frame 14. This comprises a proximal tubular section 16 and a cup-shaped distal end section 18. The cup-shaped distal end section 18 comprises a circular cylindrical shell section 20 and a base section 22 to form a cup-shaped structure. Between the two end sections 16, 18, the occluder has a net-like frame section 24. This net-like frame section 24 is Figure 4 Particularly clearly visible in sectioned form. Starting from the proximal tubular end section 16, the net-like frame section 24 initially has a number of webs 26. These merge into a branching network of webs 25 to form the net structure. Diamond-shaped structures 28 are formed in the process. In the distal direction 29, the webs 25 converge again into individual webs 30, which open into the distal end section 18.

[0040] In the arranged state (cf. Figure 1 ), the occluder 12 has a proximal hemisphere 32 and a distal hemisphere 35. In the region of the proximal hemisphere 32, a number of first anchoring means 34 are provided. These extend along a circular line along the circumference and are hook-shaped with end sections pointing in the proximal direction 27. In the region of the distal hemisphere 35, second anchoring means 36 are formed. These also extend along a circular line along the circumference, have a rod-like shape and protrude obliquely from the circumferential surface in the proximal direction 27. The anchoring means 34, 36 are also formed integrally with the frame 14.

[0041] The frame 14 of the occluder 12 consists of a self-expanding material, for example, a shape memory alloy, in particular a nitinol alloy. The expanded shape imprinted on the occluder 12 is spherical (see FIG. Figure 2 ). The occluder 12 has a longitudinal axis 38 running in the proximal and distal directions through its center point. This longitudinal axis 38 also extends through the central longitudinal axis of the tubular proximal end section 16 and through the central longitudinal axis of the distal end section 18 (cf. Figure 2). The proximal hemisphere 32 is completely covered by a biological tissue 40. This biological tissue 40 is in particular designed as a biological membrane. In particular, it can be the pericardium membrane. The tissue 40 has openings such that the first anchoring means 34 protrude through the openings. Furthermore, the tissue 40 has an insertion opening for inserting an insertion catheter through the proximal tube section 16 into the occluder 12. When the insertion catheter has been removed from the occluder 12 after the occluder 12 has been released, the elastically flexible tissue 40 can contract such that the insertion opening is closed in a substantially fluid-tight manner, so that overall the tissue 40 closes the proximal hemisphere 32 in a substantially fluid-tight manner and thereby substantially covers the frame 14. As schematically indicated by surgical threads 42, the fabric is sewn to the frame 14 by means of PTFE threads.

[0042] Near the dividing plane 44 of the proximal hemisphere 32 and the distal hemisphere 35, a number of X-ray markers 38 are placed circumferentially in the region of the proximal hemisphere 32. These markers enable precise positioning of the occluder 12 in the left auricle. Consequently, a surgeon can place the occluder 12 with particularly precise positioning.

[0043] Overall, by providing the biological tissue 40, an occluder 12 with comparatively high biocompatibility can be provided. After the occluder 12 has been positioned on the left auricula cordis, the biological tissue 40 can be overgrown by the patient's natural tissue. Due to the biological tissue 40 used, there is a high overall biocompatibility and thus an increased probability of a successful surgical procedure to close the left auricula cordis.

[0044] The following is a system for inserting the occluder 12 into a patient and for releasing the occluder 12 in the left auricle 10 of the patient according to one embodiment: Figure 5 shows an overall insertion unit 100. This comprises, on the one hand, a drive unit 102 and, on the other hand, an insertion catheter 104. The insertion catheter 104 comprises an inner tube 108 and an outer tube 110. The inner tube 108 extends through the outer tube 110. Furthermore, the outer tube 110 ends in the distal direction 29 in front of the inner tube 108. The drive unit 102 comprises a housing 114 which can be held in the hand by an operator, in particular a surgeon, and which has an overall elongated shape.

[0045] Furthermore, the drive unit 102 comprises an actuating element 116, which is rotatably arranged in the housing 114. The actuating element 116 is hollow and has a first drive thread 118 and a second drive thread 120, wherein the first drive thread 118 is proximal to the second drive thread 120 (see Figure 6 and 7 ). The actuating element 116 is in particular formed in one piece.

[0046] Furthermore, a first transmission element 122 and a second transmission element 124 are arranged in the housing 114. Both transmission elements 122, 124 have a screw-like shape overall. The first transmission element 122 has a threaded portion 126 and a head portion 128. Accordingly, the second transmission element 124 has a threaded portion 130 and a head portion 132. Both transmission elements 122, 124 can, in particular, each be formed integrally. The first transmission element 122 is motion-coupled to the inner tube 108, while the second transmission element 124 is motion-coupled to the outer tube 110. The head portion 128 of the first transmission element 122 interacts with a Luer connector 134, which is attached to the inner tube 108. The Luer connector 134 is detachably arranged on the head portion 128 of the first transmission element 122.

[0047] The head portion 132 of the second transmission element 124 interacts with the outer tube 110 to couple the movement. The outer tube 110 is detachably arranged on the head portion 132.

[0048] At the distal end of the outer tube 110, this has two Figure 9 particularly clearly visible locking finger-like end sections 136. These are formed integrally with the outer tube 110 and are elastically deformable. Overall, the functionality of the insertion unit 100 is as follows: In order to insert the occluder 12 into the left auricular cord 10, the insertion catheter 104 is first arranged on the occluder 12 to form a system comprising the insertion unit 100 and the occluder 12, in order to guide the occluder 12 to the left auricular cord 10 and then release the occluder 12.

[0049] The occluder 12 is initially in its self-expanded form and thus has a spherical outer contour (cf. Figure 2 ). The outer tube 110 is inserted into the occluder 12 through an insertion opening (not shown) in the biological tissue 40 of the occluder 12 and through the tubular proximal tube section 16. The inner tube 108 is then guided through the occluder 12 and the outer tube 110 and arranged on the distal, cup-shaped end section 18 of the occluder 12. The locking finger-like sections 136 of the inner tube 108 are secured against elastic deformation radially inward, so that the locking fingers 136 come into contact with the proximal tubular section 16 in a form-fitting manner.

[0050] Then, an operator, in particular a surgeon, can take the housing 114 in his hand and rotate the actuating element 116. As in Figure 6As shown, the actuating element 116 is first rotated such that the head-like sections 128, 132 of the two transmission elements 122, 124 are moved towards one another. This moves the distal end 137 of the outer tube 110 and the distal end 138 of the inner tube 108 away from one another. This displaces the distal end 140 of the occluder 12 in the distal direction 29, while the proximal end 142 of the occluder is displaced in the proximal direction 27. Overall, the occluder 12 is transferred into an insertion position, so that the occluder 12 as a whole assumes a compressed shape in which it has an elongated outer contour with a reduced diameter d compared to the self-expanded shape (cf. Figure 6). In this compressed insertion position, the occluder 12 can be inserted into a blood vessel together with the insertion catheter 104 and then advanced further to its intended position up to the left auricula cordis. The position of the occluder 12 can be determined using the X-ray markers 38. The occluder 12 should be applied to the left auricula cordis, particularly in the central region, i.e., in the area of ​​the X-ray markers 38.

[0051] To release the occluder 12, as shown in Figure 7 shown, the actuating element 116 rotates such that the head-like sections 128, 132 are moved away from each other.

[0052] As a result, the inner tube 108 is moved in the proximal direction 27, while the outer tube 110 is moved in the distal direction 29. During this relative movement, the proximal end 142 of the occluder 12 and the distal end 140 of the occluder 12 are moved toward each other. This increases the diameter d of the occluder 12. The occluder 12 thereby pushes into its self-expanded shape, so that the proximal end 142 and the distal end 140 of the occluder push toward each other.

[0053] The position of the middle part of the occluder 12 remains unchanged, which is reflected in the Figure 6 and 7 by the center line 144. The center line 144 runs through the center of the occluder 12 between the proximal end 142 and the distal end 140 when the latter, as in Figure 6shown, has reached the destination position. The center of the occluder 12 therefore remains true to its position and thus unchanged in its position when the occluder, as shown in Figure 7 shown, is released.

[0054] In the Figure 6 In the position shown, the inner tube 108 is held force-fittingly in the proximal direction 27 at the cup-shaped distal end section 18 of the occluder 12. Consequently, upon a proximal movement of the inner tube 108, the distal end section 18 of the occluder 12 is also moved in the proximal direction 27. If the occluder 12 is in a position as shown in Figure 7 shown, the force of the frictional connection is reduced, so that, as shown in Figure 10 shown, the Luer connector 134 can be detached from the head-like section 128 with comparatively little force, so that the Luer connector 134 and thus the inner tube 108 can be pulled off the occluder 12 through the outer tube 110.

[0055] Then, as in Figure 10 As shown, the outer tube 110 can be pulled off the occluder 12, since the locking finger-like sections 136 can now elastically displace radially inward. The occluder 12 can then assume its release position, in which it assumes its self-expanded shape, as shown in Figure 1shown, or at least pushes it into its self-expanded final shape and can thus tightly close the left auricula cordis. When the insertion catheter has been removed from the occluder 12 after the release of the occluder 12, the elastically compliant tissue 40 can contract such that the insertion opening (not shown) in the tissue 40 is closed in a substantially fluid-tight manner, so that overall the tissue 40 closes the proximal hemisphere 32 in a substantially or completely fluid-tight manner and thereby substantially or completely covers the frame 14. The patient's skin can then grow over the biological tissue 40 so that the left auricula cordis can be permanently and stably closed.

[0056] Due to the proposed configuration, the insertion catheter 104 can be withdrawn from the occluder 12 particularly easily. This is particularly possible without, or almost without, exerting any torque on the occluder 12. Thus, the risk of the insertion catheter 104 being undesirably displaced from its intended position when withdrawing it from the occluder 12 is reduced.

Claims

1. System for inserting a self-expandable occluder (12) into a patient and for releasing the occluder (12) in the left atrial appendage (10) of the patient, the system comprising the occluder (12) and an insertion unit (100) which has a drive unit (102) and has an insertion catheter (104) comprising an outer tube (110) and an inner tube (108) extending through the outer tube (110), wherein a proximal end region (16) of the occluder (12) is movement-coupled to the outer tube (110), and wherein a distal end region (18) of the occluder (12) is movement-coupled to the inner tube (108), wherein, in order to release the occluder (12), the drive unit (102) interacts with the inner tube (108) and the outer tube (110) such that, when actuated, the inner tube (108) can be moved in a distal or proximal direction and the outer tube (110) can be moved in the proximal direction (27) or distal direction (29), so that the distal end (140) and the proximal end (142) of the occluder (12) can be moved away from or toward one another, characterized in that during insertion of the occluder (12), a distal end (137) of the outer tube (110) is disposed inside the occluder (12), wherein the outer tube (110) comprises at least one elastically yielding latching finger-like portion (136) at its distal end region, wherein the latching finger-like portion (136) cooperates with the proximal end region of the occluder (12) only when the inner tube (108) is disposed inside the outer tube (110), and wherein the latching finger-like portion (136) is configured such that, after the insertion of the inner tube (108) through the outer tube (110), it is deflected from a rest position and cannot deflect radially inward.

2. System according to claim 1, wherein the outer tube (110) ends in front of the inner tube (108) in the distal direction (29).

3. System according to any of the preceding claims, wherein the occluder (12) comprises a frame (14) having a tubular proximal end portion (16) through which the insertion catheter (104) is inserted into the occluder (12).

4. System according to any of the preceding claims, wherein the occluder (12) comprises a pot-shaped distal end region (18) on which the inner tube (108) of the insertion catheter (104) is arranged.

5. System according to any of the preceding claims, wherein, in order to be inserted into a patient, the occluder (12) can be transferred into an insertion position by moving a distal end (138) of the inner tube (108) and the distal end (137) of the outer tube (110) relative to one another and away from one another, so that the proximal end (142) and the distal end (140) of the occluder (12) can be moved away from one another.

6. System according to claim 5, wherein, in order to release the occluder (12), the distal ends (137, 138) of the inner tube (108) and the outer tube (110) can be moved toward one another such that the proximal end (142) and the distal end (140) of the occluder (12) can be moved toward one another, preferably wherein a central part (144) of the occluder (12) between the proximal end (142) and the distal end (140) keeps its position substantially unchanged during the release of the occluder (12).

7. System according to any of the preceding claims, wherein the drive unit (102) has a first transmission element (122) that has a first transmission thread (126), a second transmission element (124) that has a second transmission thread (130), and an actuating element (116) that can be actuated by an operator and has a first drive thread (118) and a second drive thread (120), wherein the first transmission element (122) is movement-coupled to the inner tube (108), and wherein the second transmission element is movement-coupled to the outer tube (110), and wherein the first drive thread (118) interacts with the first transmission thread (126) and the second drive thread (120) interacts with the second transmission thread (130) in order to move the distal ends (137, 138) of the outer tube (110) and the inner tube (108) toward or away from one another.

8. System according to claim 7, wherein the first drive thread (118) is designed as a first internal thread which interacts with the first transmission thread (126) that is designed as an external thread, and wherein the second drive thread (120) is designed as a second internal thread which interacts with the second transmission thread (130) which is designed as an external thread.

9. System according to claim 7 or 8, wherein the first transmission element interacts with a Luer connector (134) arranged on the inner tube (108) for the purpose of movement coupling to the inner tube (108).

10. System according to any of the preceding claims, wherein the latching finger-like portion (136) interacts with the proximal end region (16) of the occluder (12) in a form-fitting manner when the inner tube (108) is arranged in the occluder (12).

11. System according to any of the preceding claims, wherein, in order to remove the insertion catheter from the occluder (12), the inner tube (108) can first be pulled out of the occluder (12), and then the outer tube (110) can be pulled out of the occluder (12) as soon as the inner tube (108) has been pulled out of the occluder (12) through the outer tube (110).

12. System according to any of claims 7 to 9, wherein the insertion unit (102) has a housing (114) which can be held by an operator, and wherein the transmission elements and the actuating element are arranged in or on the housing (114).

13. System according to claim 7, wherein the actuating element (116) is rotatably arranged on the housing.