A minimally invasive implantable heart assist device

Abstract

The present invention discloses a minimally invasive implantable heart assist device, comprising: a blood pump positioning bracket, the blood pump positioning bracket comprising a deformable cylinder, a nut, and a central cylinder; a bracket conveyor, the bracket conveyor comprising an outer cylinder, an inner cylinder assembly, and a locking structure, the other end of the outer cylinder and the inner cylinder assembly is provided with a cylindrical receiving groove structure for accommodating the deformable cylinder and the central cylinder; the outer diameter of the deformable cylinder increases when the outer cylinder and the inner cylinder assembly are in an unlocked state and the outer cylinder is separated from the inner cylinder assembly; a blood pump, the blood pump is provided with a blood inlet placed in the central cylinder and a blood vessel for connecting to the aorta; a positioning device, the positioning device is used to connect and position the blood pump and the blood pump positioning bracket. It can quickly realize the implantation of the blood pump through minimally invasive surgery, solving the problems of high surgical skills and great trauma to patients.

Description

Technical Field

[0001] The present invention belongs to the field of cardiac assist technology, and in particular relates to a minimally invasively implantable cardiac assist device. Background Art

[0002] Artificial hearts are referred to as "blood pumps". In recent years, implantable heart-assisted blood pumps have become an effective method for clinical treatment of advanced heart failure, with effects comparable to heart transplantation. The development of suspended blood pumps without mechanical bearings has become the mainstream of heart-assisted blood pump development. For example, the HeartMate3 and HeartWare centrifugal blood pumps commonly used in the United States have been used clinically for tens of thousands of cases; four blood pump products have also been approved for clinical use in China.

[0003] The existing blood pumps are large in size and must be implanted into the apex of the left ventricle through thoracotomy. The larger Levacor from WorldHeart and DuraHeart from TERUMO all require blood pumps to be implanted into the abdominal cavity. The implantation surgery is complicated, not only causing great trauma to the patient and causing many complications, but also requiring high surgical skills from the doctor, which affects the promotion and application of blood pumps. Summary of the invention

[0004] In order to solve the problem that existing heart assist devices all require blood pumps to be implanted into the abdominal cavity, which brings about complex surgery and great trauma to patients, the present invention proposes a heart assist device that can be minimally invasively implanted. The blood pump can be quickly implanted through minimally invasive surgery, solving the problem of high surgical requirements and great trauma to patients.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The present invention discloses a minimally invasively implantable heart assist device, comprising:

[0007] A blood pump positioning bracket, the blood pump positioning bracket comprising a deformable tube, a nut, and a center tube with one end fixedly connected to the deformable tube and the other end connected to the nut;

[0008] A stent conveyor, the stent conveyor comprising an outer cylinder, an inner cylinder assembly placed in the outer cylinder, and a locking structure arranged at one end of the outer cylinder and the inner cylinder assembly and realizing locking state control of the outer cylinder and the inner cylinder assembly, the other end of the outer cylinder and the inner cylinder assembly is provided with a cylindrical receiving groove structure for accommodating the deformable cylinder and the central cylinder; the outer diameter of the deformable cylinder increases when the outer cylinder and the inner cylinder assembly are in an unlocked state and the outer cylinder is separated from the inner cylinder assembly;

[0009] A blood pump, wherein the blood pump is provided with a blood inlet disposed in the central tube and a blood outlet blood vessel for connecting to the aorta;

[0010] A positioning device is used to connect the blood pump and the blood pump positioning bracket.

[0011] The beneficial effects of the present invention are:

[0012] The blood pump positioning stent of the present invention adopts a deformable tube structure that can self-recover to increase the outer diameter. A stent conveyor is used to deliver the deformable tube and the central tube into the minimally invasive hole of the myocardium. After the outer diameter of the deformable tube self-recovers, it is hung on the inner wall of the myocardium. The blood pump is fixed on the central tube placed outside the myocardium and connected to the aorta through the outlet blood vessel of the blood pump. The heart assist device can quickly implant the blood pump through minimally invasive surgery, reducing the requirements for surgical skills and trauma to patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the installation of a minimally invasive implantable heart assist device of the present invention;

[0015] Figure 2 This is a cross-sectional view of the blood pump positioning bracket of the present invention installed on the myocardium;

[0016] Figure 3 It is a schematic diagram of the state when the deformable tube of the present invention is pressed;

[0017] Figure 4 It is a schematic diagram of the state after the external pressure of the deformable cylinder of the present invention is released;

[0018] Figure 5 It is a schematic diagram of arranging a support frame outside the central tube of the present invention;

[0019] Figure 6 A structural schematic diagram of a suture ring;

[0020] Figure 7 is a cross-sectional view of a sewing ring of the present invention;

[0021] Figure 8 A schematic diagram of the structure of the stent conveyor of the present invention;

[0022] Fig. 9 A schematic diagram of the structure of the inner cylinder of the present invention;

[0023] Fig.10 A schematic diagram of the structure of the inner rod of the present invention;

[0024] Fig.11 A schematic diagram showing the installation of the deformable tube and the central tube into the receiving slot structure of the stent conveyor;

[0025] Fig.12 for Fig.11 In state Figure 4 The structure shown is a schematic diagram of the state after the outer cylinder of the stent conveyor is taken out;

[0026] Fig.13 for Fig.11 In state Figure 5 The structure shown is a schematic diagram of the state after the outer cylinder of the stent conveyor is taken out;

[0027] Fig.14 A cross-sectional view of a structure of a positioning device;

[0028] Fig.15 for Fig.14 The first installation diagram of the positioning device shown;

[0029] Fig.16 for Fig.14 A second installation schematic diagram of the positioning device is shown.

[0030] The reference numerals in the figures are:

[0031] 1. blood pump positioning bracket; 11. deformable cylinder; 12. nut; 13. center cylinder; 141. center ring; 142. skirt; 15. gasket; 16. support frame;

[0032] 2. Positioning device; 21. First positioning ring; 211. Positioning protrusion; 212. Gap; 22. Second positioning ring; 221. Hook;

[0033] 3. Blood pump; 31. Blood inlet; 32. Blood outlet; 33. Gasket;

[0034] 4. support conveyor; 41. outer cylinder; 42. first limiting platform; 43. locking structure; 44. receiving groove structure; 451. inner cylinder; 4511. elastic sheet; 4512. second limiting platform; 4513. locking hole; 452. inner rod; 4521. extrusion section; 4522. limiting section; 4523. extension section; 4524. connecting section; 453. limiting ring; 454. spring;

[0035] 5. Myocardium. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention discloses a minimally invasively implantable cardiac assist device, such as Figure 1 , 8As shown, it includes a blood pump positioning bracket 1, a positioning device 2, a blood pump 3 and a bracket conveyor 4.

[0043] like Figure 1 As shown, the blood pump 3 is a small pump used to completely replace the heart's work, stabilize and regulate blood flow. The blood pump 3 is provided 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.

[0044] like Figures 2 to 7 As shown, the blood pump positioning bracket 1 includes a deformable tube 11, a nut 12 and a central tube 13, one end of the central tube 13 is fixedly connected to the deformable tube 11 and the other end is connected to the nut. When in use, the blood inlet 31 of the blood pump 3 is placed in the central tube 13, and the blood outlet 32 ​​is placed outside the central tube 13.

[0045] like Figures 8 to 13 As shown, the stent conveyor 4 includes an outer cylinder 41, an inner cylinder assembly and a locking structure 43, wherein the inner cylinder assembly is placed in the outer cylinder 41 and is coaxially arranged with the outer cylinder 41, and the locking structure 43 is arranged at one end of the outer cylinder 41 and the inner cylinder assembly, and is used to realize the locking state of the outer cylinder 41 and the inner cylinder assembly, that is, to realize the control of locking and unlocking of the two. A receiving groove structure 44 is formed between the other ends of the outer cylinder 41 and the inner cylinder assembly, and the receiving groove structure 44 is cylindrical and is used to accommodate the deformable cylinder 11 and the center cylinder 13. When the outer cylinder 41 and the inner cylinder assembly are locked, the outer cylinder 41 and the inner cylinder assembly cannot move relative to each other in the axial direction, and the deformable cylinder 11 and the center cylinder 13 are placed in the receiving groove structure 44 and are compressed and deformed; when unlocked, the outer cylinder 41 can be axially withdrawn from the inner cylinder assembly relative to the inner cylinder assembly, and at this time, the deformable cylinder 11 and the center cylinder 13 lose the restraining effect of the outer cylinder 41 and deform to increase the outer diameter and restore to the original state.

[0046] The positioning device is used to connect and position the blood pump 3 and the blood pump positioning bracket 1 .

[0047] The above-mentioned heart assist device has a simple structure, can be implanted minimally invasively, and can be installed quickly. Fig.11 As shown, the outer tube 41 and the inner tube assembly are locked, and the deformable tube 11 and the central tube 13 are placed together in the receiving groove structure 44. The deformable tube 11 contracts and deforms under the action of the outer tube and the inner tube assembly. A small hole is opened in the myocardium 5 of the auricle or atrium through minimally invasive surgery, and one end of the receiving groove structure 44 of the stent conveyor 4 is inserted into the myocardial hole to place the deformable tube 11 in the myocardium. After unlocking the locking structure 43, the outer tube 41 is removed, and the outer diameter of the deformable tube 11 increases to achieve self-recovery until the outer diameter is larger than the hole diameter so that it hangs on the inner wall of the myocardium. Then the inner tube assembly is removed, and the nut 12 is installed on the end of the central tube 13 outside the myocardium. Then, the blood pump 3 is installed on the blood pump positioning bracket 1 through the positioning device, and the blood vessel 32 is connected to the aortic opening, and the installation is completed.

[0048] Based on the above structure and principle, there are many existing implementation methods of the blood pump, for example, it can be a centrifugal blood pump, such as Figure 1 As shown, the arrows in the figure represent the direction of blood flow.

[0049] There are many ways to implement the deformable tube 11. It can be deformed when pressed, and the outer diameter can be expanded to restore to its original state after the pressure is released. There are many ways to implement the deformable tube 11, as long as the outer diameter can be increased after the restraint is lost. Since the function of the deformable tube is to ensure that it is reliably hung in the myocardium and to support the connection between the entire cardiac assist device and the heart machine, its reliability and stability after restoration are very important. For this reason, the deformable tube 11 is preferably made of shape memory material, such as shape memory alloy. Shape memory alloy materials include nickel and titanium, which are the materials with the best shape memory properties among the current shape memory materials.

[0050] For further improvement, the deformable tube 11 can be in a mesh or non-mesh shape. In order to enhance the reliability of its hanging in the myocardium, the deformable tube 11 preferably adopts a mesh structure. With this structure and material, the deformable tube 11 has greater elasticity and can be received by the receiving groove structure 44. When released, it quickly returns to the original umbrella shape, has strong wall hanging stability, is not afraid of ventricular wall collapse, and can be stably connected to the blood pump.

[0051] In order to enhance the stability of the entire cardiac assist device, the blood pump positioning bracket 1 also includes a suture ring, such as Figure 1 , 6 As shown in Figure 7, the suture ring includes a center ring 141 sleeved outside the center tube 13 and a skirt 142 connected to the outer ring of the center ring 141. During operation, the skirt 142 is close to the outer wall of the myocardium 5, and the skirt 142 and the myocardium 5 are sutured to further enhance the firmness of fixation.

[0052] Skirt 142 Figure 6 As shown, a ring structure can be used. The skirt 142 can be made of a felt sheet wrapped with a polyester cloth material.

[0053] In order to facilitate the adjustment of the flush state of the mouth edge, the blood pump positioning bracket 1 further 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 mouth edge flush. The gasket is the same as the skirt 142, and can be made of a felt sheet wrapped with a polyester cloth material.

[0054] Exemplarily, the nut 12 and the center ring 141 can be made of medical stainless steel or titanium alloy.

[0055] In order to achieve positioning support for the deformable tube 11, one end of the central tube 13 connected to the deformable tube 11 is connected to a support frame 16 via a hinge structure, and a torsion spring is provided in the hinge structure to make the angle between the support frame 16 and the central tube 13 greater than or equal to 60 degrees.

[0056] In a natural state, under the action of the torsion spring, the angle between the support frame 16 and the central tube 13 is the smallest, which is 60 degrees, that is, the movable end of the support frame 16 can be twisted toward one end of the support frame 16, and even parallel to the inner wall of the central tube 13, so as to facilitate installation. Preferably, in order to improve the stability of the entire heart assist device when mounted on the wall, the torsion spring makes the angle between the support frame 16 and the central tube 13 greater than or equal to 90 degrees.

[0057] There are multiple support frames 16 , which are evenly distributed around the central tube 13 .

[0058] The stent conveyor 4 is used to place the blood pump positioning stent into the myocardium. In order to prevent the outer tube 41 from taking away the central tube 13 and the deformable tube 11 when the inner tube assembly is withdrawn, a first limiting platform 42 for limiting the movement of the central tube 13 toward one end of the locking structure 43 can be provided on the outer wall of the inner tube assembly. The first limiting platform 42 can be annular or convex.

[0059] There are many ways to implement the inner cylinder assembly. For example, when the self-recovery ability of the deformable cylinder 11 is strong, that is, after the outer cylinder 41 is pulled out, the deformable cylinder 11 can quickly recover to its original state to achieve reliable wall hanging. The inner cylinder assembly can be a columnar structure, that is, the deformable cylinder 11 can recover to its original state without the intervention of the inner cylinder assembly. In order to increase the speed of the deformable cylinder 11 recovering to its original state after the outer cylinder 41 is pulled out and facilitate the assembly of the deformable cylinder 11 and the central cylinder 13, as shown in FIG. 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 outside the inner rod 452, an elastic sheet 4511 is provided at one end thereof and a second limiting platform 4512 is provided inside the inner cylinder 451. The inner rod 452 includes an extrusion section 4521, a limiting section 4522, an extension section 4523 and a connecting section 4524 which are arranged in sequence, wherein the extrusion section 4521 is used to extrude the elastic sheet 4511 so that the elastic sheet 4511 pushes the deformable tube 11 outwards to enable it to quickly hang on the wall; the connecting section 4524 is arranged outside the inner tube 451 and is detachably connected to the limiting ring 453; the spring 454 is sleeved on the inner rod 452 and is arranged 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 a force to pull the inner rod 452 to move toward one end of the limiting ring 453; the limiting section 452 has a smaller diameter than the extrusion section 4521, and after the extrusion section 4521 completes the extrusion of the elastic sheet 4511, it abuts against the second limiting platform 4512 to prevent the inner rod 452 from transitioning to one end of the limiting ring 453 under the action of the spring.

[0060] When assembling the inner cylinder assembly of the second structure, one end of the connecting section 4524 of the inner rod 452 is inserted from one end of the elastic sheet 4511 of the inner cylinder 451 and passes through the inner rod 452, and the spring is put on and fixed on the connecting section 4524 to install the limiting ring 453. At this time, under the action of the spring, its extrusion section 4521 is pressed into the inner cylinder 451, and the limiting section 4522 abuts against the second limiting platform 4512. Under the action of the extrusion section 4521, the elastic sheet 4511 is slightly deformed and expanded outward. Then, after the outer cylinder 41 is put on the inner cylinder assembly, the locking structure 43 is assembled.

[0061] When the inner cylinder assembly of the second structure is adopted, the limit ring 453 not only limits the spring but also acts as an operating end when the deformable cylinder 11 and the center cylinder 13 are installed. When the deformable cylinder 11 and the center cylinder 13 of the blood pump positioning bracket 1 are assembled, the limit ring 453 is pressed while the outer cylinder 41 is fixed. At this time, the spring is compressed, and the extrusion section 4521 moves and loses the extrusion effect on the elastic sheet 4511. The spring sheet returns to its original caliber. The prepared center cylinder 13 is placed in the receiving groove structure 44 between the elastic sheet 4511 and the outer cylinder 41. The deformable cylinder 11 is pinched by hand and gradually pushed into the receiving groove structure 44 until the deformable cylinder 11 is flush with the notch of the receiving groove structure 44. The limit ring 453 is released, and the extrusion section 4521 is squeezed into the inner cylinder 451. The limit section 4522 abuts against the second limit platform 4512, and the storage work is completed.

[0062] When the inner cylinder assembly of the second structure is adopted, the deformable cylinder 11 and the central cylinder 13 are released, and one end equipped with the deformable cylinder 11 and the central cylinder 13 is inserted into the target myocardial hole, the locking structure 43 is removed, and the outer cylinder 41 is removed. Under the performance of the deformable cylinder 11 itself and the effect of the deformable cylinder 11, the outer diameter of the deformable cylinder 11 increases to achieve self-recovery and hang in the myocardial wall. Then, the limiting ring 453 is pressed, the spring is compressed, the extrusion section 4521 moves and loses the extrusion effect on the elastic sheet 4511, the spring sheet returns to the original caliber, and the inner cylinder assembly can be withdrawn.

[0063] In order to facilitate the removal of the outer cylinder 41, an operating handle may be provided on the outer wall of the outer cylinder.

[0064] If the support frame 16 is hinged on the central tube 13, when the deformable tube 11 and the central tube 13 are installed, the support frame 16 is squeezed by the outer tube 41 until it is parallel to the central tube 13 while the deformable tube 11 is pinched and gradually pushed into the accommodating groove structure 44. When the deformable tube 11 and the central tube 13 are released, under the action of the torsion spring, the support frame 16 recovers to the minimum angle with the central tube 13 and is in close contact with the inner wall of the core machine, so as to realize the positioning support of the deformable tube 11.

[0065] In order to facilitate preparation and processing and improve operability, the extrusion section 4521 is cylindrical, the elastic sheet 4511 is an arc-shaped sheet, and there are at least two elastic sheets 4511. With this structure, a groove of a certain depth can be directly processed along the axial direction of the end of the cylindrical inner rod 452. The extrusion section 4521 and the elastic sheet 4511 can be tightly matched.

[0066] 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 placed on the elastic sheet 4511 during operation and facilitate operation, a reducing section is provided between the extrusion section 4521 and the limiting section 4522. The diameter of the reducing section gradually decreases from one end connected to the extrusion section 4521 to the other end connected to the limiting section 4522.

[0067] For the convenience of operation, the locking structure 43 is a locking rod, and the corresponding positions of the inner cylinder assembly and the outer cylinder 41 are provided with locking holes 4513 for inserting the locking rod. That is, the locking holes 4513 can be directly provided at the corresponding positions of the inner cylinder 451 and the outer cylinder 41, and the inner cylinder 451 and the outer cylinder 41 can be locked or unlocked by directly inserting or pulling out.

[0068] Exemplarily, there are 3 to 6 elastic sheets 4511 , and the interval between two adjacent elastic sheets 4511 is 0.5-1 mm.

[0069] The receiving groove structure 44 corresponding to the elastic piece 4511 is the assembly position of the deformable tube 11 and the central tube 13. For this purpose, preferably, the length of the elastic piece 4511 is 10-15 mm.

[0070] The outer tube 41 and the inner rod 452 can be made of 316L stainless steel or medical titanium alloy, and the inner tube 451 can be made of medical nickel-titanium memory alloy material.

[0071] The stent delivery device 4 using the above structure can realize quick installation of the stent, and is convenient for minimally invasive surgery to install the blood pump device on the left atrial appendage or the left atrium wall. It can effectively solve the problems of long implantation time, large trauma, many complications, and complex surgery, and can greatly reduce the risk of surgical implantation; the surgical adaptability is wide, thereby saving more heart failure patients.

[0072] The positioning device realizes the connection and positioning of the blood pump 3 and the blood pump positioning bracket 1. There are various ways to realize it. For example, threads are set on the blood inlet 31 of the blood pump 3 and the central tube 13, and the two are connected through internal and external threads. However, the threaded connection has the problem of slow installation speed. In order to achieve fast installation, 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 connecting with the first positioning ring.

[0073] The first positioning ring 21 and the second positioning ring 22 realize the connection between the blood pump positioning bracket 1 and the blood pump, and there are many connection methods. Due to the need for rapid installation and replaceability during surgery, preferably, the first positioning ring 21 and the second positioning ring 22 are connected by a detachable structure.

[0074] When the first positioning ring 21 and the second positioning ring 22 are connected via a detachable structure, the following structure may be adopted:

[0075] Example 1: See Fig.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, and at least two limiting protrusions 211 placed on the same diameter surface are arranged on the outer wall / inner wall of the end;

[0076] Hooks 221 are evenly arranged on the inner wall / outer wall of one end of the second positioning ring 22 connected to the first positioning ring 21, the spacing between the two connected limiting protrusions 211 is greater than or equal to the width of the hook 221, and the first positioning ring 21 and / or the second positioning ring 22 are provided with a limiting structure for limiting the axial movement of the hook 221 along the second positioning ring 22 after the hook 221 is hung on the limiting protrusion 211.

[0077] Example 2: At least two limiting protrusions 211 disposed on the same diameter surface are provided on the outer wall / inner wall of one end of the second positioning ring 22 connected to the first positioning ring 21;

[0078] Hooks 221 are evenly arranged on the inner wall / outer wall of one end where the first positioning ring 21 and the second positioning ring 22 are connected, the spacing between the two connected limiting protrusions 211 is greater than or equal to the width of the hook 221, and the first positioning ring 21 and / or the second positioning ring 22 are provided with a limiting structure for limiting the axial movement of the hook 221 along the second positioning ring 22 after the hook 221 is hung on the limiting protrusion 211.

[0079] Example 1 and Example 1 are roughly the same in structure, except that the positions of their respective detachable structures are swapped.

[0080] The positioning device 2 with this structure can be installed quickly. Fig.15 As shown, the hook 221 is directly pressed against the limiting protrusion 211 and then rotated until the hook 221 is placed in the gap between two adjacent limiting protrusions 211, and then pushed toward the limiting protrusion 211 and then rotated to hook the hook 221 on the limiting protrusion 211. Fig.16 As shown, the hook portion 221 is directly aligned with the gap 212 between two adjacent limiting protrusions 211 and then inserted, and then rotated to hook the hook portion 221 onto the limiting protrusion 211 .

[0081] The limiting structure can be set on the first positioning ring 21 or the second positioning ring 22. Figures 14 to 16 In the structure shown, the limiting structure is arranged on the outer wall of the first positioning ring 21, so as to abut against the end of the hook body after the hook 221 is hung on the limiting protrusion 211; or it can be arranged on the inner wall of the second positioning ring 22, so as to abut against the end of the first positioning ring 21 after the hook 221 is hung on the limiting protrusion 211; or it can be arranged on the outer wall of the first positioning ring 21 and the inner wall of the second positioning ring 22 at the same time.

[0082] The overall length of the limiting protrusion 211 accounts for 90-95% of the circumference of the first positioning ring 21 / the second positioning ring 22.

[0083] The positioning device 2 can be made of 316L medical stainless steel or medical nickel-titanium alloy, which has sufficient rigidity, elasticity and shape memory properties.

[0084] By adopting this structure, the blood pump positioning bracket 1 and the blood pump 3 can be quickly connected and installed, which can effectively solve the problems of long implantation time, large trauma, many complications, and complex surgery, and can greatly reduce the risk of surgical implantation; the surgical adaptability is wide, thereby saving more heart failure patients.

[0085] The structure is simple, small in size, and light in weight, which can reduce surgical invasiveness. The blood pump is installed in the atrium, the output path of the blood pump is short, and the physiological compatibility and biosafety are improved.

[0086] In order to improve the sealing performance and avoid blood leakage at the edge of the deformable tube 11, Figure 1 As shown, during assembly, a gasket 33 may be placed outside the blood inlet 31 of the blood pump 3 . The gasket 33 may be made of polyester and placed inside the second positioning ring 22 .

[0087] Specifically, use Figure 1 The heart assist device shown in the figure is operated by minimally invasive surgery to open a small hole in the left atrial appendage or the left atrium, and after the deformable tube 11 and the central tube 13 are received in the receiving groove structure 44, the state is as follows Fig.11 Insert one end of the stent delivery device equipped with the deformable tube 11 into the hole, remove the locking structure 43, pull out the outer tube 41, and the deformable tube 11 will restore itself to an umbrella shape and hang on the inner wall of the myocardium. Fig.12 , 13 After installing the suture ring, gasket 15, and nut 12 in sequence, press the limit ring to pull out the inner tube assembly. The blood inlet 31 of the blood pump 3 is placed in the central tube 13, and the blood pump and the blood pump positioning bracket 1 are quickly installed through the positioning device 2. Figure 1 The outlet blood vessel 32 is connected to the aorta opening, and the whole installation process is completed.

[0088] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A minimally invasively implantable heart assist device, characterized in that: include: A blood pump positioning bracket (1), the blood pump positioning bracket (1) comprising a deformable tube (11), a nut (12), and a center tube (13) having one end fixedly connected to the deformable tube (11) and the other end connected to the nut; A stent conveyor (4), the stent conveyor (4) comprising an outer cylinder (41), an inner cylinder assembly disposed in the outer cylinder (41), and a locking structure (43) disposed at one end of the outer cylinder (41) and the inner cylinder assembly and realizing locking state control of the outer cylinder (41) and the inner cylinder assembly, the other end of the outer cylinder (41) and the inner cylinder assembly being provided with a cylindrical receiving groove structure (44) for accommodating the deformable cylinder (11) and the center cylinder (13); the outer diameter of the deformable cylinder (11) increases when the outer cylinder (41) and the inner cylinder assembly are in an unlocked state and the outer cylinder (41) is separated from the inner cylinder assembly; A blood pump (3), wherein the blood pump (3) is provided with a blood inlet (31) disposed in the central tube (13) and a blood outlet blood vessel (32) for connecting to the aorta; A positioning device (2), the positioning device being used to connect and position the blood pump (3) and the blood pump positioning bracket (1); A first limiting platform (42) is provided on the outer wall of the inner cylinder assembly for limiting the movement of the central cylinder (13) toward one end of the locking structure (43); The inner cylinder assembly comprises: An inner cylinder (451), wherein an elastic sheet (4511) is provided at one end of the inner cylinder (451) and a second limiting platform (4512) is provided inside the inner cylinder (451); an inner rod (452), the inner rod (452) comprising an extrusion section (4521) for extruding the elastic sheet (4511), a limiting section (4522) for abutting against the second limiting platform (4512) after the extrusion section (4521) has completed extruding the elastic sheet (4511), an extension section (4523), and a connecting section (4524) disposed outside the inner cylinder (451); a limiting ring (453), the limiting ring (453) being detachably connected to the connecting section (4524); A spring (454) is sleeved on the inner rod (452) and is placed between the limiting ring (453) and the end of the inner rod (452).

2. A minimally invasively implantable cardiac assist device according to claim 1, characterized in that: The deformable tube (11) is made of a shape memory material, and the deformable tube (11) is in a mesh shape.

3. A minimally invasive implantable cardiac assist device according to claim 1, characterized in that: The blood pump positioning bracket (1) further comprises a sewing ring, wherein the sewing ring comprises a central ring (141) sleeved outside the central tube (13) and a skirt (142) connected to the outer ring of the central ring (141).

4. The minimally invasive implantable cardiac assist device according to claim 1, characterized in that: One end of the central tube (13) connected to the deformable tube (11) is connected to a support frame (16) via a hinge structure, and a torsion spring is provided in the hinge structure for making the angle between the support frame (16) and the central tube (13) greater than or equal to 60 degrees.

5. A minimally invasive implantable heart assist device according to claim 4, characterized in that: The torsion spring enables the angle between the support frame (16) and the center tube (13) to be greater than or equal to 90 degrees.

6. The minimally invasively implantable cardiac assist device according to claim 1, characterized in that: There are at least two elastic sheets (4511), the elastic sheets (4511) are arc-shaped sheets, and the extrusion section (4521) is cylindrical.

7. The minimally invasively implantable cardiac assist device according to claim 1, characterized in that: The locking structure (43) is a locking rod, and corresponding positions of the inner cylinder assembly and the outer cylinder (41) are both provided with locking holes (4513) for inserting the locking rod.

8. The minimally invasively implantable cardiac assist device according to claim 1, characterized in that: The positioning device (2) comprises a first positioning ring (21) fixed on the nut (12) and a second positioning ring (22) fixed on the blood pump (3) and used for connecting with the first positioning ring; At least two limiting protrusions (211) are evenly arranged on the same diameter surface on the outer wall / inner wall of one end where the first positioning ring (21) is connected to the second positioning ring (22). Hooks (221) are evenly arranged on the inner wall / outer wall of one end of the second positioning ring (22) connected to the first positioning ring (21), the spacing between two connected limiting protrusions (211) is greater than or equal to the width of the hook (221), and the first positioning ring (21) and / or the second positioning ring (22) are provided with a limiting structure for limiting the amount of axial movement of the hook (221) along the second positioning ring (22) after the hook (221) is hung on the limiting protrusion (211).

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