Rapid positioning device for blood pump implantation

Abstract

The utility model discloses a rapid positioning device for implanting a blood pump. The rapid positioning device comprises a first positioning ring and a second positioning ring, wherein the first positioning ring is fixed on a blood pump positioning bracket; the second positioning ring is fixed on the blood pump and is connected with the first positioning ring; at least two limiting protrusions evenly arranged on the same diameter face are arranged on the outer wall / inner wall of the end, connected with the second positioning ring, of the first positioning ring, and hook parts are evenly arranged on the inner wall / outer wall of the end, connected with the first positioning ring, of the second positioning ring. The distance between every two connected limiting protrusions is larger than or equal to the width of the hook part, and the first positioning ring and / or the second positioning ring are / is provided with limiting structures used for limiting the movement amount of the hook part moving in the axial direction of the second positioning ring after the hook part is hung on the limiting protrusions. Rapid connection and installation of the blood pump positioning support and the blood pump can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of cardiac assist technology, specifically relating to a rapid positioning device for blood pump implantation. Background Technology

[0002] Artificial hearts, often simply called "blood pumps," have become an effective treatment for advanced heart failure in recent years, with results comparable to heart transplantation. The development of bearingless, suspended blood pumps has become the mainstream approach in cardiac assistive device (CAP) development. For example, the HeartMate 3 and HeartWare centrifugal blood pumps, commonly used in the United States, have been used in tens of thousands of clinical cases. In China, four blood pump products have also been approved for clinical application.

[0003] Existing blood pumps are relatively large and require open-chest surgery to implant them at the apex of the left ventricle. Even larger pumps, such as WorldHeart's Levacor and TERUMO's DuraHeart, require implantation in the abdominal cavity. This complex implantation procedure is not only highly invasive and prone to complications for patients, but also demands a high level of surgical skill from the surgeon, hindering the widespread adoption of blood pumps.

[0004] After long-term research, the inventors developed a minimally invasive method for blood pump implantation, which requires attaching a blood pump positioning stent to the myocardial wall. During blood pump implantation, installation speed is crucial to minimizing risks. Therefore, achieving rapid connection and installation of the blood pump positioning stent and the blood pump is of paramount importance. Utility Model Content

[0005] In order to achieve rapid connection and installation of the blood pump positioning bracket and the blood pump, this utility model proposes a rapid positioning device for blood pump implantation.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] The first aspect of this utility model discloses a rapid positioning device for blood pump implantation, including a first positioning ring for fixing on a blood pump positioning bracket and a second positioning ring for fixing on the blood pump and connected to the first positioning ring.

[0008] At least two limiting protrusions evenly placed on the same diameter plane are provided on the outer / inner wall of the end where the first positioning ring connects to the second positioning ring.

[0009] Hooks are evenly provided on the inner / outer wall of the end of the second positioning ring that is connected to the first positioning ring. The distance between two connected limiting protrusions is greater than or equal to the width of the hooks. The first positioning ring and / or the second positioning ring are provided with a limiting structure for limiting the amount of movement of the hooks along the axial direction of the second positioning ring after the hooks are hooked on the limiting protrusions.

[0010] The second aspect of this utility model discloses a rapid positioning device for blood pump implantation, including a first positioning ring for fixing on a blood pump positioning bracket and a second positioning ring for fixing on the blood pump and connected to the first positioning ring.

[0011] At least two limiting protrusions are provided on the outer / inner wall of the end of the second positioning ring that is connected to the first positioning ring;

[0012] Hooks are uniformly provided on the inner / outer wall of the end where the first positioning ring and the second positioning ring are connected. The distance between two connected limiting protrusions is greater than or equal to the width of the hooks. The first positioning ring and / or the second positioning ring are provided with a limiting structure for limiting the amount of movement of the hooks along the axial direction of the second positioning ring after the hooks are hooked on the limiting protrusions.

[0013] The beneficial effects of this utility model are:

[0014] This utility model uses two positioning rings to be fixed to the blood pump positioning bracket and the blood pump respectively. The two positioning rings are assembled using a hook and a limiting protrusion structure. During operation, it is only necessary to align the hook with the gap between the two adjacent limiting protrusions, insert it, and then rotate it. The operation is simple and quick. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the installation of the minimally invasive implantable cardiac assist device of this utility model;

[0017] Figure 2 This is a cross-sectional view of the blood pump positioning stent of this utility model installed on the myocardium;

[0018] Figure 3 This is a schematic diagram of the deformable cylinder of this utility model when it is pressed.

[0019] Figure 4This is a schematic diagram showing the state of the deformable cylinder of this utility model after the external pressure is released;

[0020] Figure 5 A schematic diagram of a support frame installed outside the central cylinder of this utility model;

[0021] Figure 6 This is a schematic diagram of a suture ring structure;

[0022] Figure 7 This is a cross-sectional view of the suture ring of this utility model;

[0023] Figure 8 This is a schematic diagram of a structure of the support conveyor of this utility model;

[0024] Figure 9 This is a schematic diagram of one structure of the inner cylinder of this utility model;

[0025] Figure 10 This is a schematic diagram of one structure of the inner rod of this utility model;

[0026] Figure 11 A schematic diagram of the deformable cylinder and the central cylinder being installed into the receiving groove structure of the support conveyor;

[0027] Figure 12 for Figure 11 Use in state Figure 4 The diagram shows the state of the structure after the outer cylinder of the support conveyor has been removed.

[0028] Figure 13 for Figure 11 Use in state Figure 5 The diagram shows the state of the structure after the outer cylinder of the support conveyor has been removed.

[0029] Figure 14 A cross-sectional view of a structure of a positioning device;

[0030] Figure 15 for Figure 14 The diagram shows the first possible installation of the positioning device.

[0031] Figure 16 for Figure 14 The diagram shows a second installation method for the positioning device.

[0032] The attached figure labels are named as follows:

[0033] 1. Blood pump positioning bracket; 11. Deformable cylinder; 12. Nut; 13. Central cylinder; 141. Central ring; 142. Skirt; 15. Gasket; 16. Support frame;

[0034] 2. Positioning device; 21. First positioning ring; 211. Limiting protrusion; 22. Second positioning ring; 221. Hook;

[0035] 3. Blood pump; 31. Blood inlet; 32. Outlet blood vessel; 33. Washer;

[0036] 41. Outer cylinder; 42. First limiting structure; 43. Locking structure; 44. Receiving groove structure; 451. Inner cylinder; 4511. Elastic sheet; 4512. Second limiting platform; 4513. Locking hole; 452. Inner rod; 4521. Compression section; 4522. Limiting section; 4523. Extension section; 4524. Connecting section; 453. Limiting ring; 454. Spring; 5. Myocardium. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] This utility model discloses a minimally invasive implantable cardiac assist device, such as... Figure 1 , 8 As shown, it includes a blood pump positioning stent 1, a positioning device 2, a blood pump 3, and a stent delivery device.

[0044] like Figure 1 As shown, blood pump 3 is a small pump used to completely replace the heart's function, stabilizing and regulating blood flow. Blood pump 3 is equipped with a blood inlet 31 and an outlet blood vessel 32. The outlet blood vessel 32 is an artificial blood vessel used to connect to the outlet blood vessel 32 of the aorta.

[0045] like Figures 2 to 7 As shown, the blood pump positioning bracket 1 includes a deformable cylinder 11, a nut 12, and a central cylinder 13. One end of the central cylinder 13 is fixedly connected to the deformable cylinder 11, and the other end is connected to the nut. In use, the blood inlet 31 of the blood pump 3 is placed inside the central cylinder 13, and the outlet blood vessel 32 is placed outside the central cylinder 13.

[0046] like Figures 8 to 13 As shown, the support conveyor includes an outer cylinder 41, an inner cylinder assembly, and a locking structure 43. The inner cylinder assembly is placed inside the outer cylinder 41 and coaxially arranged with it. The locking structure 43 is located at one end of the outer cylinder 41 and the inner cylinder assembly, used to lock the outer cylinder 41 and the inner cylinder assembly, i.e., to control their locking and unlocking. A receiving groove structure 44 is formed between the other ends of the outer cylinder 41 and the inner cylinder assembly. This receiving groove structure 44 is cylindrical and is used to accommodate the deformable cylinder 11 and the central cylinder 13. When the outer cylinder 41 and the inner cylinder assembly are locked, they cannot move axially relative to each other. The deformable cylinder 11 and the central cylinder 13 are compressed and deformed within the receiving groove structure 44. When unlocked, the outer cylinder 41 can be axially pulled away from the inner cylinder assembly. At this time, the deformable cylinder 11 and the central cylinder 13 lose the restraining effect of the outer cylinder 41, deform, and their outer diameter increases, returning to their original shape.

[0047] The positioning device is used to connect and position the blood pump 3 and the blood pump positioning bracket 1.

[0048] The aforementioned cardiac assist device has a simple structure, can be implanted minimally invasively, and can be installed quickly. Before implantation, such as... Figure 11 As shown, the outer cylinder 41 and inner cylinder assembly are locked, and the deformable cylinder 11 and central cylinder 13 are placed together in the receiving groove structure 44. Under the force of the outer cylinder and inner cylinder assembly, the deformable cylinder 11 contracts and deforms. A small hole is made in the myocardium 5 of the atrial appendage or atrium through minimally invasive surgery. One end of the stent delivery device receiving groove structure 44 is inserted into the myocardial hole so that the deformable cylinder 11 is placed in the myocardium. After unlocking the locking structure 43, the outer cylinder 41 is removed. The outer diameter of the deformable cylinder 11 increases and recovers to a size larger than the hole diameter, thus hanging on the inner wall of the myocardium. Then the inner cylinder assembly is removed. After installing the nut 12 on the end of the central cylinder 13 that is outside the myocardium, the blood pump 3 is installed on the blood pump positioning stent 1 through the positioning device. The outflow vessel 32 is connected to the aortic opening, thus completing the installation.

[0049] Based on the above structure and principle, there are many existing implementations of its blood pump. For example, it can be a centrifugal blood pump, such as... Figure 1 As shown in the figure, the arrows represent the direction of blood flow.

[0050] There are various ways to implement the deformable cylinder 11. It deforms when pressed, and its outer diameter expands to return to its original shape after the pressure is released. Any method that allows the outer diameter to increase after being released from restraint is acceptable. Since the deformable cylinder's function is to reliably attach to the myocardium and support the entire cardiac assist device's connection to the cardiomyocyte, its reliability and stability after returning to its original shape are crucial. Therefore, the deformable cylinder 11 is preferably made of shape memory materials, such as shape memory alloys. Shape memory alloys include nickel and titanium, which are currently the materials with the best shape memory performance.

[0051] For further purposes, the deformable cylinder 11 can be either mesh-like or non-mesh-like. To enhance its reliability in attaching to the myocardium, a mesh structure is preferred for the deformable cylinder 11. This structure and material give the deformable cylinder 11 greater elasticity, allowing it to be housed in the receiving groove structure 44. When released, it quickly returns to its original umbrella shape, providing strong stability against wall collapse and stable connection to the blood pump.

[0052] To enhance the stability of the entire cardiac assist device, the blood pump positioning stent 1 also includes a suture ring, such as... Figure 1 , 6 As shown in Figure 7, the suture ring includes a central ring 141 sleeved outside the central tube 13 and a skirt 142 connected to the outer ring of the central ring 141. During operation, the skirt 142 is close to the outer wall of the myocardium 5, and suturing the skirt 142 and the myocardium 5 can further enhance the fixation firmness.

[0053] Skirt hem 142 Figure 6 As shown, a ring structure can be adopted. The skirt 142 can be made of polyester fabric material wrapped around a felt sheet.

[0054] To facilitate adjustment of the flush position of the rim, the blood pump positioning bracket 1 also includes a gasket 15, which is placed between the skirt 142 and the nut 12. The number of gaskets can be selected according to the installation of the nut to keep the rim flush. The gasket is the same as the skirt 142 and can be made of felt wrapped with polyester fabric.

[0055] For example, the nut 12 and the center ring 141 can both be made of medical-grade stainless steel or titanium alloy.

[0056] In order to achieve the positioning support of the deformable cylinder 11, the end of the central cylinder 13 connected to the deformable cylinder 11 is connected to the support frame 16 through a hinge structure. The hinge structure is provided with a torsion spring for making the angle between the support frame 16 and the central cylinder 13 greater than or equal to 60 degrees.

[0057] In its natural state, under the action of the torsion spring, the angle between the support frame 16 and the central cylinder 13 is at its minimum, 60 degrees. This means that the movable end of the support frame 16 can be twisted towards one end of the support frame 16, or even parallel to the inner wall of the central cylinder 13, to facilitate installation. Preferably, to improve the stability of the entire cardiac assist device wall-mounted installation, the torsion spring ensures that the angle between the support frame 16 and the central cylinder 13 is greater than or equal to 90 degrees.

[0058] There are multiple support frames 16, which are evenly distributed around the central cylinder 13.

[0059] The stent delivery device is used to place the blood pump positioning stent into the myocardium. To prevent the outer cylinder 41 from taking away the central cylinder 13 and the deformable cylinder 11 when the inner cylinder assembly is withdrawn, a first limiting platform 42 can be provided on the outer wall of the inner cylinder assembly to restrict the movement of the central cylinder 13 toward the locking structure 43. The first limiting platform 42 can be annular or protruding.

[0060] There are many ways to implement the inner cylinder assembly. For example, when the deformable cylinder 11 has a strong self-recovery capability, that is, after the outer cylinder 41 is removed, the deformable cylinder 11 can quickly return to its original shape to achieve reliable wall mounting, the inner cylinder assembly can be a columnar structure, that is, the deformable cylinder 11 can self-recover to its original shape without the intervention of the inner cylinder assembly. In order to improve the speed at which the deformable cylinder 11 returns to its original shape after the outer cylinder 41 is removed and to facilitate the assembly of the deformable cylinder 11 and the central cylinder 13, such as... Figures 8 to 13As shown, the inner cylinder assembly includes an inner cylinder 451, an inner rod 452, a limiting ring 453, and a spring 454. The inner cylinder 451 is sleeved on the outer side of the inner rod 452, and an elastic plate 4511 is provided at one end of the inner cylinder 451. A second limiting platform 4512 is provided inside the inner cylinder 451. The inner rod 452 includes a pressing section 4521, a limiting section 4522, an extension section 4523, and a connecting section 4524 arranged sequentially. The pressing section 4521 is used to press the elastic sheet 4511, so that the elastic sheet 4511 pushes the deformable cylinder 11 outward, so that it can quickly hang on the wall. The connecting section 4524 is placed outside the inner cylinder 451 and is detachably connected to the limiting ring 453. The spring 454 is sleeved on the inner rod 452 and placed between the limiting ring 453 and the end of the inner rod 452. Under the action of the limiting ring 453 and the end of the inner rod 452, the spring has the force to pull the inner rod 452 towards one end of the limiting ring 453. The diameter of the limiting section 4522 is smaller than that of the pressing section 4521. After the pressing section 4521 has finished pressing the elastic sheet 4511, it abuts against the second limiting platform 4512 to prevent the inner rod 452 from moving excessively towards one end of the limiting ring 453 under the action of the spring.

[0061] When assembling the inner cylinder assembly using the second structure described above, one end of the connecting section 4524 of the inner rod 452 is inserted into and protrudes from one end of the elastic plate 4511 of the inner cylinder 451. After the spring is fitted, it is fixed to the connecting section 4524, and the limiting ring 453 is installed. At this time, under the action of the spring, its pressing section 4521 presses into the inner cylinder 451, and the limiting section 4522 abuts against the second limiting platform 4512. Under the action of the pressing section 4521, the elastic plate 4511 undergoes a slight deformation and expands outward. Then, after the outer cylinder 41 is fitted onto the inner cylinder assembly, the locking structure 43 is assembled.

[0062] When the inner cylinder assembly with the second structure described above is installed, the limiting ring 453 not only limits the spring but also acts as the operating end. When assembling the deformable cylinder 11 and the central cylinder 13 of the blood pump positioning bracket 1, while fixing the outer cylinder 41, press the limiting ring 453. At this time, the spring is compressed, the compression section 4521 moves and loses its compression effect on the elastic plate 4511, and the spring plate returns to its original diameter. Place the prepared central cylinder 13 into the receiving groove structure 44 between the elastic plate 4511 and the outer cylinder 41. Gradually push the deformable cylinder 11 into the receiving groove structure 44 until the deformable cylinder 11 is flush with the groove opening of the receiving groove structure 44. Release the limiting ring 453, and the compression section 4521 squeezes into the inner cylinder 451. The limiting section 4522 abuts against the second limiting platform 4512, and the storage work is completed.

[0063] When the inner cylinder assembly with the second structure described above is released, the end equipped with the deformable cylinder 11 and the central cylinder 13 is inserted into the target myocardial cavity. The locking structure 43 is removed, and the outer cylinder 41 is pulled out. Under the performance of the deformable cylinder 11 itself and its action, the outer diameter of the deformable cylinder 11 increases, achieving self-recovery and hanging inside the myocardial wall. Then, the limiting ring 453 is pressed, the spring is compressed, the compression section 4521 moves and loses its compression effect on the elastic plate 4511, the spring plate returns to its original diameter, and the inner cylinder assembly can be pulled out.

[0064] To facilitate the removal of the outer cylinder 41, an operating handle can be installed on the outer wall of the outer cylinder.

[0065] If a support frame 16 is hinged to the central cylinder 13, during the installation of the deformable cylinder 11 and the central cylinder 13, while the deformable cylinder 11 is being held and gradually pushed into the receiving groove structure 44, the support frame 16 is being pressed by the outer cylinder 41 until it is parallel to the central cylinder 13. When the deformable cylinder 11 and the central cylinder 13 are released, under the action of the torsion spring, the support frame 16 returns to its minimum angle with the central cylinder 13 and is in close contact with the inner wall of the machine, thus achieving positioning and support of the deformable cylinder 11.

[0066] To facilitate manufacturing and improve operability, the extrusion section 4521 is cylindrical, and the elastic sheet 4511 is arc-shaped, with at least two elastic sheets 4511. With this structure, a groove of a certain depth can be directly machined into the end of the cylindrical inner rod 452 along its axial direction. The extrusion section 4521 and the elastic sheet 4511 are fitted together with a tight fit.

[0067] The extrusion section 4521 can extend out or be inserted into the elastic sheet 4511. In order to improve the smoothness of the extrusion section 4521 in the elastic sheet 4511 during operation and facilitate operation, a variable diameter section is provided between the extrusion section 4521 and the limiting section 4522. The diameter of the variable diameter section gradually decreases from the end connected to the extrusion section 4521 to the end connected to the limiting section 4522.

[0068] For ease of operation, the locking structure 43 is a locking rod, and corresponding positions of the inner cylinder assembly and the outer cylinder 41 are provided with locking holes 4513 for inserting the locking rod. The locking holes 4513 can be directly provided at corresponding positions on the inner cylinder 451 and the outer cylinder 41, allowing for locking and unlocking of the inner cylinder 451 and the outer cylinder 41 simply by inserting or removing the rod.

[0069] For example, there are 3 to 6 elastic sheets 4511, and the spacing between two adjacent elastic sheets 4511 is 0.5-1 mm.

[0070] The receiving groove structure 44 corresponding to the elastic sheet 4511 is the assembly position of the deformable cylinder 11 and the central cylinder 13. Preferably, the length of the elastic sheet 4511 is 10-15mm.

[0071] The outer cylinder 41 and inner rod 452 can be made of 316L stainless steel or medical titanium alloy, and the inner cylinder 451 can be made of medical nickel-titanium shape memory alloy material.

[0072] The stent delivery device with the above structure can be quickly installed, facilitating minimally invasive surgery to install the blood pump device to the left atrial appendage or left atrium / ventricular wall. It can effectively solve problems such as long implantation time, large trauma, many complications, and complex surgery, and can greatly reduce the risks of surgical implantation. The surgical applicability is wide, thus saving more heart failure patients.

[0073] The positioning device connects and positions the blood pump 3 and the blood pump positioning bracket 1. This can be achieved in various ways, such as by setting threads on the blood inlet 31 and the central cylinder 13 of the blood pump 3, connecting them via internal and external threads. However, threaded connections suffer from slow installation speeds. Therefore, to achieve rapid installation, such as... Figures 14 to 16 As shown, the positioning device includes a first positioning ring 21 fixed on the nut 12 and a second positioning ring 22 fixed on the blood pump 3 for connection with the first positioning ring.

[0074] The first positioning ring 21 and the second positioning ring 22 connect the blood pump positioning bracket 1 to the blood pump, and there are various connection methods. Due to the need for quick installation and replacement during surgery, preferably, the first positioning ring 21 and the second positioning ring 22 are connected by a detachable structure.

[0075] When the first positioning ring 21 and the second positioning ring 22 are connected by a detachable structure, the following structure can be adopted:

[0076] Example 1: See Figure 14 , 15 As shown, one end of the first positioning ring 21 is fixedly connected to the nut 12, and the other end is connected to the second positioning ring 22. At least two limiting protrusions 211 placed on the same diameter plane are provided on the outer / inner wall of this end.

[0077] Hooks 221 are uniformly provided on the inner / outer wall of the end of the second positioning ring 22 that is connected to the first positioning ring 21. The distance between two connected limiting protrusions 211 is greater than or equal to the width of the hooks 221. The first positioning ring 21 and / or the second positioning ring 22 are provided with limiting structures for limiting the movement of the hooks 221 along the axial direction of the second positioning ring 22 after the hooks 221 are hooked on the limiting protrusions 211.

[0078] Example 2: At least two limiting protrusions 211 located on the same diameter plane are provided on the outer / inner wall of the end where the second positioning ring 22 is connected to the first positioning ring 21;

[0079] Hooks 221 are uniformly provided on the inner / outer wall of the end where the first positioning ring 21 and the second positioning ring 22 are connected. The distance between the two connected limiting protrusions 211 is greater than or equal to the width of the hooks 221. The first positioning ring 21 and / or the second positioning ring 22 are provided with a limiting structure for limiting the amount of movement of the hooks 221 along the axial direction of the second positioning ring 22 after the hooks 221 are hooked on the limiting protrusions 211.

[0080] Example 1 and Example 2 have roughly the same structure, the only difference being that the positions of their detachable structures are swapped.

[0081] The positioning device 2, employing this structure, allows for rapid installation. During installation, or as... Figure 15 As shown, simply press the hook 221 tightly against the limiting protrusion 211 and rotate it until the hook 221 is positioned in the gap between two adjacent limiting protrusions 211. Then push it towards the limiting protrusion 211 and rotate it again to hook the hook 221 onto the limiting protrusion 211. Or as shown... Figure 16 As shown, simply align the hook with the gap 212 between the two adjacent limiting protrusions 211 and insert it, then rotate it to hook the hook 221 onto the limiting protrusion 211.

[0082] The limiting structure can be set on the first positioning ring 21 or the second positioning ring 22, as shown in Example 1. Figures 14 to 16 In the structure shown, the limiting structure is provided on the outer wall of the first positioning ring 21 so that it abuts against the end of the hook body after the hook 221 is hooked on the limiting protrusion 211; or it can be provided on the inner wall of the second positioning ring 22 so that it abuts against the end of the first positioning ring 21 after the hook 221 is hooked on the limiting protrusion 211; or it can be provided on both the outer wall of the first positioning ring 21 and the inner wall of the second positioning ring 22.

[0083] The overall length of the limiting protrusion 211 accounts for 90-95% of the circumference of the first positioning ring 21 / second positioning ring 22.

[0084] The positioning device 2 can be made of 316L medical stainless steel or medical nickel-titanium alloy, which has both sufficient rigidity and elasticity and shape memory properties.

[0085] This structure enables rapid connection and installation of the blood pump positioning stent 1 and the blood pump 3, effectively solving problems such as long implantation time, large trauma, many complications, and complex surgery, and greatly reducing the risks of surgical implantation; it also has a wide range of surgical applications, thus saving more heart failure patients.

[0086] The structure is simple, small in size and light in weight, which can reduce the invasiveness of surgery. The blood pump is installed in the atrium, and the output path of the blood pump is short, which improves physiological compatibility and biosafety.

[0087] To improve sealing performance and prevent blood leakage from the rim of the deformable cylinder 11, such as Figure 1 As shown, during assembly, a washer 33 can be placed outside the blood inlet 31 of the blood pump 3. The washer 33 can be made of polyester material and placed inside the second positioning ring 22.

[0088] Specifically, adopting such as Figure 1 The cardiac assist device shown is manufactured through minimally invasive surgery, by making a small incision in the left atrial appendage or left atrium, and then housing the deformable cylinder 11 and the central cylinder 13 into the receiving groove structure 44, as shown in the figure. Figure 11 As shown. Insert one end of the stent delivery device equipped with the deformable cylinder 11 into the hole, remove the locking structure 43, pull out the outer cylinder 41, and the deformable cylinder 11 will automatically return to an umbrella shape and hang on the inner wall of the myocardium, as shown. Figure 12 , 13 As shown. After sequentially installing the suture ring, gasket 15, and nut 12, press the limiting ring and pull out the inner cylinder assembly. The blood inlet 31 of the blood pump 3 is placed into the central cylinder 13. The blood pump and blood pump positioning bracket 1 are quickly installed through the positioning device 2, as shown. Figure 1 As shown. The outlet vessel 32 is connected to the aortic opening, thus completing the entire installation process.

[0089] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood as not limiting the scope of protection of this invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and such modifications and combinations are still within the scope of protection of this invention.

Claims

1. A blood pump implant quick positioning device, characterized in that, The first positioning ring (21) is connected with the second positioning ring (22) at one end, and at least two limiting protrusions (211) are arranged on the outer wall / inner wall of the one end of the first positioning ring (21) and the second positioning ring (22) and are uniformly arranged on the same diameter surface. The inner wall / outer wall of the one end of the second positioning ring (22) connected with the first positioning ring (21) is uniformly provided with a hook portion (221), the spacing between the two limiting protrusions (211) connected with each other is greater than or equal to the width of the hook portion (221), and the first positioning ring (21) and / or the second positioning ring (22) is provided with a limiting structure for limiting the movement amount of the hook portion (221) in the axial direction of the second positioning ring (22) after the hook portion (221) is hung on the limiting protrusion (211). The limiting protrusions (211) are 2 to 6.

2. The rapid positioning device for blood pump implantation according to claim 1, characterized in that, The limiting protrusions (211) are two, and the ratio of the total length of the two limiting protrusions (211) to the circumference of the first positioning ring (21) is 90-95%.

3. The rapid positioning device for blood pump implantation according to claim 1, wherein, The first positioning ring (21) is connected with the second positioning ring (22) at one end, and at least two limiting protrusions (211) are arranged on the outer wall / inner wall of the one end of the first positioning ring (21) and the second positioning ring (22) and are uniformly arranged on the same diameter surface.

4. A blood pump implant rapid positioning device, characterized in that, The inner wall / outer wall of the one end of the second positioning ring (22) connected with the first positioning ring (21) is uniformly provided with a hook portion (221), the spacing between the two limiting protrusions (211) connected with each other is greater than or equal to the width of the hook portion (221), and the first positioning ring (21) and / or the second positioning ring (22) is provided with a limiting structure for limiting the movement amount of the hook portion (221) in the axial direction of the second positioning ring (22) after the hook portion (221) is hung on the limiting protrusion (211). The limiting protrusions (211) are 2 to 6. The limiting protrusions (211) are two, and the ratio of the total length of the two limiting protrusions (211) to the circumference of the first positioning ring (21) is 90-95%.

5. A rapid positioning device for blood pump implantation according to claim 4, characterized in that The first positioning ring (21) is connected with the second positioning ring (22) at one end, and at least two limiting protrusions (211) are arranged on the outer wall / inner wall of the one end of the first positioning ring (21) and the second positioning ring (22) and are uniformly arranged on the same diameter surface.

6. The rapid positioning device for blood pump implantation according to claim 4, wherein, The inner wall / outer wall of the one end of the second positioning ring (22) connected with the first positioning ring (21) is uniformly provided with a hook portion (221), the spacing between the two limiting protrusions (211) connected with each other is greater than or equal to the width of the hook portion (221), and the first positioning ring (21) and / or the second positioning ring (22) is provided with a limiting structure for limiting the movement amount of the hook portion (221) in the axial direction of the second positioning ring (22) after the hook portion (221) is hung on the limiting protrusion (211). The limiting protrusions (211) are 2 to 6. The limiting protrusions (211) are two, and the ratio of the total length of the two limiting protrusions (211) to the circumference of the first positioning ring (21) is 90-95%.

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