A transcatheter aortic valve replacement assist device

Abstract

The application discloses a kind of auxiliary devices for transcatheter aortic valve replacement, it is related to TAVR treatment technical field, including delivery and recovery unit, including the delivery pipe for aortic valve replacement auxiliary;Protection umbrella unit is installed on the delivery pipe, for the interception of thrombus / plaque, including the block body of the surface of delivery pipe is set, rotating shaft is rotated on the block body, and opening and closing piece is installed on the rotating shaft and delivery and recovery unit.The application greatly reduces the risk of cerebral embolism, guarantees the safety of operation, realizes the full coverage of three cerebral blood supply branches by inverted conical hollow filter screen, the aperture is accurately controlled in the balance interval of "intercepting thrombus+passing blood flow", can effectively thrombus / plaque enter cerebral blood vessels, while allowing red blood cells, platelets to pass normally, avoid cerebral ischemia, and hollow filter screen uses medical elastic material, there is no risk of blood vessel scratch during unfolding / recovery process, and the protection effect and biological safety are considered, to provide key guarantee for high-risk patients.

Description

Technical Field

[0001] This invention relates to the field of TAVR treatment technology, and in particular to a transcatheter aortic valve replacement assist device. Background Technology

[0002] Transcatheter aortic valve replacement (TAVR) is a key procedure for treating severe aortic stenosis. However, the procedure requires balloon dilation or implantation of an artificial valve, which can easily lead to the detachment of thrombi and plaques from the aortic wall. These thrombi can then travel with the blood flow to the brachiocephalic artery, left common carotid artery, and left subclavian artery (three branches supplying blood to the brain), causing serious complications such as cerebral embolism.

[0003] However, in practical applications, some problems remain unresolved. The following are some common issues with transcatheter aortic valve replacement assist devices: First, when preventing cerebral embolism, a brain protection filter needs to be implanted separately via femoral or radial artery puncture, increasing the risk of vascular injury. The filter's coverage is limited and cannot completely cover the openings of the three cerebral blood supply branches, still posing a risk of thrombus leakage. Second, the anchoring stability is poor, and intraoperative blood flow impact or balloon dilation can easily cause the device to shift, losing its protective effect. Third, it is difficult to capture and intercept thrombi during postoperative retrieval, which may lead to secondary thrombus dislodgement. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing transcatheter aortic valve replacement assist devices, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to solve the problems of incomplete protection of cerebral blood supply branches, unstable device anchoring, and incomplete thrombus recovery.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a transcatheter aortic valve replacement assist device, comprising: a delivery and recovery unit, including a delivery tube for aortic valve replacement assistance; a protective umbrella unit, installed on the delivery tube for intercepting thrombi / plaques, including a block sleeved on the surface of the delivery tube, a rotating shaft on the block, an opening and closing member installed on the rotating shaft and the delivery and recovery unit, and a hollow filter screen for intercepting thrombi / plaques fixed on the opening and closing member; and an anchoring unit, installed on the block for reducing the displacement of the protective umbrella unit, including a transmission member installed on the block, and the transmission member cooperating with the rotating shaft, a driving member installed on the block, and the driving member cooperating with the transmission member, an anchor claw fixed on the surface of the driving member, an air bladder sleeved on one end surface of the anchor claw, an air cavity opened in the anchor claw, and an inflation / deflation device installed on the block and the anchor claw, and the inflation / deflation device cooperating with the hollow filter screen and the air bladder respectively.

[0008] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: a connecting tube is fixed at the bottom of the block, and the connecting tube is sleeved on the surface of the delivery tube; a delivery sheath is sleeved on the surface of the connecting tube; a connecting pipe is sleeved on the surface of the delivery tube, and the connecting pipe cooperates with the opening and closing component.

[0009] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: a guide wire is provided inside the delivery tube, a telescopic tube is sleeved on the surface of the delivery tube, and the two ends of the telescopic tube are respectively fixed between the block and the opening and closing component.

[0010] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: the opening and closing component includes a short column located on the circumference of the connecting tube, both ends of the short column are embedded with ball bearings, an arc-shaped rod is fixed between adjacent ball bearings, an umbrella strip is fixed on the surface of the rotating shaft, one end of the umbrella strip is fixed to the short column, a connecting block is sleeved on the surface of the delivery tube, and the connecting block cooperates with the connecting tube, and a movable rod is rotatably connected between the surface of the connecting block and the surface of the umbrella strip.

[0011] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: a spring is sleeved on the surface of the delivery tube and the spring is located inside the telescopic tube, and the two ends of the spring are respectively fixed to the surface of the block and the surface of the connecting block.

[0012] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: a movable block slides within the block body, a guide post is fixed on the movable block, a guide groove is provided on the surface of the rotating shaft, and the guide post slides within the guide groove; a fixed block slides within the block body, and both ends of the fixed block are respectively fixed to the surface of the movable block and the surface of the driving component; a T-shaped block is fixed within the block body, and the movable block slides on the T-shaped block.

[0013] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: a rotating cylinder is rotatable on the block, a cylinder slides inside the block, and one end of the cylinder slides on the inner wall of the rotating cylinder, a driving groove is provided on the inner wall of the rotating cylinder, a ball is embedded on the surface of one end of the cylinder and slides in the driving groove, a torsion spring is sleeved on the surface of one end of the rotating cylinder and the two ends of the torsion spring are respectively fixed to the surface of the rotating cylinder and the inner wall of the block, and one end of the fixing block is fixed to one end of the cylinder.

[0014] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: the inflation / deflation component includes a piston sliding within an air chamber, a threaded tube fixed to one side of the piston, a screw rotating on the anchor claw, the screw being threadedly connected to the threaded tube, a bevel gear fixed to one end of the screw, a bevel rack fixed to the block, and the bevel rack meshing with the bevel gear, air holes being provided on both the anchor claw and the air bladder, the air chamber communicating with the air bladder through the air holes, a connecting tube fixed to the anchor claw, and both ends of the connecting tube communicating with the hollow filter and the air chamber respectively, a limiting groove being provided inside the anchor claw, and a limiting block being fixed to the surface of one end of the threaded tube, and the limiting block sliding within the limiting groove.

[0015] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: an elastic band is fixed on the hollow filter screen, and one end of the elastic band is fixed to the surface of the short column; a shielding strip is fixed on the surface of the block, and the shielding strip is fixed to the hollow filter screen and the umbrella strip respectively.

[0016] As a preferred embodiment of the transcatheter aortic valve replacement assist device of the present invention, wherein: an elastic cover is fixed to the surface of the anchor claw, and the elastic cover is fixed to the surface of the block.

[0017] The beneficial effects of this invention are as follows: 1. It significantly reduces the risk of cerebral embolism and ensures surgical safety. The inverted cone-shaped hollow filter achieves full coverage of the three cerebral blood supply branches. The pore size is precisely controlled within the balance range of "intercepting thrombi + allowing blood flow", which can effectively prevent thrombi / plaques from entering cerebral blood vessels, while allowing red blood cells and platelets to pass through normally, thus avoiding cerebral ischemia. In addition, the hollow filter is made of medical elastic material, so there is no risk of vascular scratches during the unfolding / retrieval process. It takes into account both protective effect and biosafety, and provides key protection for high-risk patients (such as those with severe calcification and high thrombus burden).

[0018] 2. The anchoring is stable and highly adaptable, simplifying surgical procedures. The anchoring unit is double-fixed through "anchor claw contact + balloon buffer". After the anchor claw is deployed, it fits against the aortic sinus wall. After the balloon is inflated, the contact area increases, which can resist the impact of balloon expansion and high-speed blood flow during surgery. At the same time, the device adopts a coaxial delivery design, which can be directly adapted to the existing (18-24F) TAVR delivery system without the need to change special instruments, reducing the difficulty of operation for the surgeon.

[0019] 3. Thorough thrombus recovery avoids secondary risks. During device recovery, the inflation and deflation components work in tandem. The anchor claw rotates, driving the bevel gear to rotate in the opposite direction. The piston returns to its original position, causing the airbag to deflate. At the same time, the gas in the air chamber is forced into the filter screen, reducing the filter screen aperture and "encapsulating" the intercepted thrombus. The thrombus is then removed from the body along with the device, avoiding secondary embolism caused by thrombus detachment during recovery using traditional devices. In addition, the elastic band assists in tightening the filter screen during closure, ensuring that no thrombus is missed, further improving postoperative safety. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Local three-dimensional structure of transcatheter aortic valve replacement assist device Figure 1 .

[0022] Figure 2 Local three-dimensional structure of transcatheter aortic valve replacement assist device Figure 2 .

[0023] Figure 3 Transcatheter aortic valve replacement assist device Figure 2 Enlarged view of region A in the middle.

[0024] Figure 4 This is a partial structural cross-sectional plan view of a transcatheter aortic valve replacement assist device.

[0025] Figure 5 Transcatheter aortic valve replacement assist device Figure 4 Enlarged view of region B in the middle.

[0026] Figure 6 This is a partial cross-sectional plan view of the hollow filter screen of a transcatheter aortic valve replacement device.

[0027] Figure 7 Cross-sectional stereoscopic view of the local structure of a transcatheter aortic valve replacement assist device. Figure 1 .

[0028] Figure 8 Cross-sectional stereoscopic view of the local structure of a transcatheter aortic valve replacement assist device. Figure 2 .

[0029] Figure 9 Cross-sectional stereoscopic view of the local structure of a transcatheter aortic valve replacement assist device. Figure 3 .

[0030] Figure 10 Cross-sectional stereoscopic view of the local structure of a transcatheter aortic valve replacement assist device. Figure 4 .

[0031] Figure 11 Transcatheter aortic valve replacement assist device Figure 10 Enlarged view of region C.

[0032] Figure 12 Transcatheter aortic valve replacement assist device Figure 10 Enlarged view of region D in the middle.

[0033] Figure 13 Transcatheter aortic valve replacement assist device Figure 11 Enlarged view of region E in the middle.

[0034] Figure 14 This is a three-dimensional view of the pivot and guide post of a transcatheter aortic valve replacement assist device.

[0035] In the diagram: 1. Conveying and recycling unit; 11. Conveying pipe; 12. Connecting pipe; 13. Conveying sheath; 14. Connecting pipe; 15. Guide wire; 16. Telescopic pipe; 2. Protective umbrella unit; 21. Block; 22. Rotating shaft; 23. Opening and closing component; 24. Hollow filter screen; 25. Elastic band; 26. Shielding strip; 3. Anchoring unit; 31. Transmission component; 32. Driving component; 33. Anchor claw; 34. Airbag; 35. Air chamber; 36. Inflation and deflation component; 37. Elastic cover; 231. Short column; 232. Rolling ball; 233. Arc shape 234. Rod; 235. Umbrella strip; 236. Connecting block; 237. Movable rod; 311. Spring; 312. Moving block; 313. Guide post; 314. Guide groove; 315. Fixing block; 316. T-block; 327. Rotary cylinder; 328. Cylindrical cylinder; 329. Drive groove; 320. Ball bearing; 321. Torsion spring; 322. Piston; 33. Threaded pipe; 34. Screw; 35. Bevel gear; 366. Bevel rack; 37. Air hole; 38. Connecting pipe; 39. Limiting groove; 30. Limiting block. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1, referring to Figures 2-9 This is the first embodiment of the present invention, which provides a transcatheter aortic valve replacement assist device, which includes a delivery and recovery unit 1, a protective umbrella unit 2, and an anchoring unit 3.

[0040] Specifically, the delivery and retrieval unit 1 includes a delivery tube 11 for aortic valve replacement assistance. The delivery and retrieval unit 1 enables the retrieval of the protective umbrella unit 2 and the anchoring unit 3 after surgery. The delivery tube 11 is a medical flexible tube, which is existing technology and will be clearly known to those skilled in the art, so it will not be described in detail here.

[0041] Specifically, the protective umbrella unit 2 is installed on the delivery pipe 11 for intercepting thrombi / plaques. It includes a block 21 sleeved on the surface of the delivery pipe 11, with four rotating shafts 22 on the block 21. The shafts 22 are sealed to the block 21. Opening and closing parts 23 are installed on the rotating shafts 22 and the delivery and recovery unit 1. Hollow filter screens 24 for intercepting thrombi / plaques are fixed on the opening and closing parts 23.

[0042] With the opening and closing component 23, after it opens the hollow filter 24, the pore size of the hollow filter 24 can intercept thrombi / plaques >50μm to avoid cerebral embolism, while allowing red blood cells and platelets to pass through without affecting cerebral blood flow. After the protective umbrella unit 2 is unfolded, it is "inverted cone" shaped with a diameter of 25-30mm and a height of 15mm, which can completely cover the openings of the brachiocephalic artery, left common carotid artery and left subclavian artery in the aortic arch, achieving full coverage of the three cerebral blood supply branches.

[0043] The hollow filter 24 is made of elastic hollow medical-grade material, which is existing technology and can be clearly understood by those skilled in the art, so it will not be described in detail here. After the hollow filter 24 is unfolded, its pore size becomes larger, which is just enough to intercept thrombi / plaques >50μm, while allowing red blood cells and platelets to pass through. When it is closed after use, under the action of the air-inflating component 36 in the anchoring unit 3, the pore size of the hollow filter 24 becomes smaller, and the intercepted thrombi / plaques are captured during the "umbrella closing" process. The thrombi / plaques can be removed from the body when the protective umbrella unit 2 is retrieved after the operation.

[0044] Specifically, the anchoring unit 3, installed on the block 21, is used to reduce the displacement of the protective umbrella unit 2. It includes a transmission component 31 installed on the block 21, and the transmission component 31 cooperates with the rotating shaft 22. A driving component 32 is installed on the block 21, and the driving component 32 cooperates with the transmission component 31. Through the setting of the transmission component 31 and the driving component 32, multiple sets of anchor claws 33 can be rotated and opened when the protective umbrella unit 2 is opened. After unfolding, it fits the aortic sinus wall without the risk of vascular damage. It can resist the blood flow impact during balloon dilation during transcatheter aortic valve replacement surgery and avoid the displacement of the protective umbrella unit 2.

[0045] An anchor claw 33 is fixed to the surface of the drive component 32. An air bladder 34 is sleeved on one end of the surface of the anchor claw 33. An air cavity 35 is opened inside the anchor claw 33. An inflation / deflation device 36 is installed on the block 21 and the anchor claw 33. The inflation / deflation device 36 cooperates with the hollow filter screen 24 and the air bladder 34 respectively. The anchor claw 33 is made of medical polyurethane material. The air bladder 34 can expand and contract. It is a medical material and is existing technology. Those skilled in the art can clearly understand it. It will not be described in detail here.

[0046] As the anchor claw 33 rotates and unfolds, the airbag 34 expands under the action of the inflation / deflation component 36, which increases its adhesion to the aortic sinus wall and provides protection, preventing the anchor claw 33 from directly contacting the aortic sinus wall, thus reducing the risk of vascular injury and improving the anchoring effect of the protective umbrella unit 2. As the airbag 34 rotates, unfolds, and closes, it contracts, facilitating its detachment from the aortic sinus wall and retrieving the protective umbrella unit 2 and the anchoring unit 3 into the delivery sheath 13. It adopts an integrated design of "self-expanding protective umbrella + coaxial delivery sheath" and is compatible with existing TAVR delivery systems with diameters of 18-24F.

[0047] Example 2, refer to Figures 2-6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0048] Specifically, a connecting pipe 12 is fixed at the bottom of the block 21, and the connecting pipe 12 is sleeved on the surface of the delivery pipe 11. A delivery sheath 13 is sleeved on the surface of the connecting pipe 12, and a connecting pipe 14 is sleeved on the surface of the delivery pipe 11. The connecting pipe 14 cooperates with the opening and closing part 23. One end of the connecting pipe 12 is fixed to the block 21. Both the connecting pipe 12 and the connecting pipe 14 are medical hoses.

[0049] By moving the connecting pipe 12, connecting pipe 14 and conveying pipe 11 simultaneously, the protective umbrella unit 2 and the anchoring unit 3 located in the conveying sheath 13 can be moved out together. After the conveying pipe 11 is released, the connecting pipe 14 and the conveying pipe 11 can be moved by the self-expanding unfolding action of the protective umbrella unit 2. After unfolding, the conveying pipe 11 and the connecting pipe 14 can be moved independently without affecting the opened protective umbrella unit 2. When the protective umbrella unit 2 needs to be closed later, the conveying pipe 11 and the connecting pipe 14 can be moved back so that the connecting pipe 14 can act on the opening and closing part 23 to retract the unfolded hollow filter screen 24, which is convenient for subsequent recycling into the conveying sheath 13.

[0050] Specifically, a guide wire 15 is provided inside the delivery tube 11, and a telescopic tube 16 is sleeved on the surface of the delivery tube 11. The two ends of the telescopic tube 16 are respectively fixed between the block 21 and the opening and closing member 23. The guide wire 15 is a medical guide wire, which is existing technology and can be clearly understood by those skilled in the art, so it will not be described in detail here. The telescopic tube 16 can shield and protect the spring 237 to avoid contact with blood, while not affecting the movement of the connecting block 235.

[0051] Specifically, the opening and closing component 23 includes a short column 231 located on the circumference of the connecting pipe 14. Both ends of the short column 231 are embedded with ball bearings 232. An arc-shaped rod 233 is fixed between adjacent ball bearings 232. An umbrella strip 234 is fixed on the surface of the rotating shaft 22. One end of the umbrella strip 234 is fixed to the short column 231. A connecting block 235 is sleeved on the surface of the conveying pipe 11, and the connecting block 235 cooperates with the connecting pipe 14. A movable rod 236 rotates between the surface of the connecting block 235 and the surface of the umbrella strip 234.

[0052] The ball bearing 232 is rotatably connected to the short column 231. The ball bearing 232 enables the arc-shaped rod 233 to be rotatably connected to the short column 231. There are eight short columns 231 and eight arc-shaped rods 233. There are four umbrella strips 234 and four movable rods 236. The connecting block 235 is sealed to the conveying pipe 11. The movement of the connecting block 235 causes the umbrella strips 234 to rotate under the action of the movable rod 236, thereby realizing the unfolding and retraction of the hollow filter screen 24 between each umbrella strip 234. The short column 231, the ball bearing 232, the arc-shaped rod 233, the umbrella strips 234, the connecting block 235 and the movable rod 236 are all made of nickel-titanium alloy.

[0053] Specifically, a spring 237 is sleeved on the surface of the delivery pipe 11, and the spring 237 is located inside the telescopic pipe 16. The two ends of the spring 237 are fixed to the surface of the block 21 and the surface of the connecting block 235, respectively. With the setting of the spring 237, after the protective umbrella unit 2 and the anchoring unit 3 move out of the delivery sheath 13 and the relative fixation between the delivery pipe 11 and the connecting pipe 12 is released, the connecting block 235 is pushed to move under the action of its elastic reset, thereby driving the movable rod 236 to rotate and move, so that the umbrella strip 234 rotates and opens.

[0054] Multiple sets of hollow filter screens 24 are unfolded to form an "inverted cone shape," completely covering the openings of the brachiocephalic artery, left common carotid artery, and left subclavian artery in the aortic arch, achieving full coverage of the three cerebral blood supply branches. During subsequent retraction, the connecting tube 12 is fixed, and the delivery tube 11 and connecting tube 14 are moved back, allowing the connecting tube 14 to push the connecting block 235 back, thus retracting the unfolded hollow filter screens 24 for subsequent return into the delivery sheath 13.

[0055] Example 3, referring to Figures 7-14 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0056] Specifically, a movable block 311 slides inside the block 21, a guide post 312 is fixed on the movable block 311, a guide groove 313 is opened on the surface of the rotating shaft 22, and the guide post 312 slides in the guide groove 313. A fixed block 314 slides inside the block 21, and the two ends of the fixed block 314 are respectively fixed to the surface of the movable block 311 and the surface of the driving component 32. A movable groove that cooperates with the movable fixed block 314 is opened inside the block 21. A T-shaped block 315 is fixed inside the block 21, and the movable block 311 slides on the T-shaped block 315. The movable block 311 is slidably sleeved on the surface of the T-shaped block 315.

[0057] Through the cooperation of guide groove 313 and guide post 312, when umbrella bar 234 rotates and drives shaft 22 to rotate, guide groove 313 on shaft 22 rotates, causing guide post 312 to move within guide groove 313, thereby driving moving block 311 and fixed block 314 to move together, thus driving cylinder 322 to move. T-block 315 guides and limits moving block 311, making moving block 311 more stable during movement.

[0058] Specifically, a rotating cylinder 321 rotates on the block 21, and the rotating cylinder 321 is sealed to the block 21. A cylinder 322 slides inside the block 21, and one end of the cylinder 322 slides on the inner wall of the rotating cylinder 321. A drive groove 323 is provided on the inner wall of the rotating cylinder 321. A ball bearing 324 is embedded on the surface of one end of the cylinder 322, and the ball bearing 324 slides in the drive groove 323. The ball bearing 324 is rotatably connected to the cylinder 322. A torsion spring 325 is sleeved on the surface of one end of the rotating cylinder 321, and the two ends of the torsion spring 325 are fixed to the surface of the rotating cylinder 321 and the inner wall of the block 21, respectively. One end of the fixing block 314 is fixed to one end of the cylinder 322.

[0059] With the arrangement of the drive groove 323 and the ball bearing 324, when the fixed block 314 drives the cylinder 322 to move, the ball bearing 324 can move within the drive groove 323, thereby causing the rotating cylinder 321 to rotate, which in turn causes the anchor claw 33 to rotate and unfold, so that it corresponds synchronously with the unfolding and closing of the protective umbrella unit 2. This can resist the blood flow impact during balloon expansion and prevent the protective umbrella from shifting. With the arrangement of the torsion spring 325, it deforms when the rotating cylinder 321 rotates, providing force for subsequent rotation and reset.

[0060] Specifically, the inflation / deflation component 36 includes a piston 361 that slides within the air chamber 35. A threaded tube 362 is fixed to one side of the piston 361. A seal is formed between the piston 361 and the inner wall of the air chamber 35. A screw 363 rotates on the anchor claw 33 and is threadedly connected to the threaded tube 362. A seal is formed between the threaded tube 362 and the anchor claw 33 to prevent gas leakage. A bevel gear 364 is fixed to one end of the screw 363, and a bevel rack 36 is fixed to the block 21. 5. The bevel rack 365 meshes with the bevel gear 364. Air holes 366 are provided on both the anchor claw 33 and the air bladder 34. The air chamber 35 is connected to the air bladder 34 through the air holes 366. A connecting pipe 367 is fixed on the anchor claw 33. The two ends of the connecting pipe 367 are connected to the hollow filter screen 24 and the air chamber 35, respectively. A limiting groove 368 is provided in the anchor claw 33. A limiting block 369 is fixed on one end of the threaded pipe 362. The limiting block 369 slides in the limiting groove 368.

[0061] The conical rack 365 is arc-shaped and coaxial with the rotating cylinder 321. Through the arrangement of the conical rack 365 and the bevel gear 364, when the rotating cylinder 321 drives the anchor claw 33 to rotate, it in turn drives the screw 363 and the bevel gear 364 to revolve together. Since the conical rack 365 is fixed relative to the bevel gear 364 and under the action of meshing, the revolving bevel gear 364 rotates on its own axis at the same time, which in turn causes the screw 363 to rotate and drive the threaded tube 362 to move, thereby pushing the piston 361 to move in the air chamber 35. The gas on one side of the air chamber 35 is forced into the airbag 34 through the air hole 366 to make it expand, which can increase the adhesion with the aortic sinus wall and play a protective role, preventing the anchor claw 33 from directly contacting the aortic sinus wall, reducing the risk of vascular injury, and improving the anchoring effect of the protective umbrella unit 2.

[0062] Meanwhile, on the other side of the air chamber 35, under the movement of the piston 361, the gas in the hollow filter 24 during the deployment process is drawn in through the connecting tube 367. After the hollow filter 24 is deployed, its pore size becomes larger, which is just enough to intercept thrombi / plaques >50μm, while allowing red blood cells and platelets to pass through. During the resetting process of the anchor claw 33 after use, the piston 361 returns to its original position, allowing the airbag 34 to recover, and the gas on the other side of the air chamber 35 is forced into the hollow filter 24, reducing the pore size of the hollow filter 24, capturing the intercepted thrombi / plaques during the "umbrella closing" process. When the protective umbrella unit 2 is retrieved after surgery, the thrombi / plaques can be removed from the body, and the threaded tube 362 is guided and limited by the limiting block 369 and the limiting groove 368.

[0063] Specifically, an elastic band 25 is fixed on the hollow filter 24, and one end of the elastic band 25 is fixed to the surface of the short column 231. With the setting of the elastic band 25, when the opening and closing part 23 is retracted, under the action of its elastic tension, the short column 231, which is not fixed to the umbrella strip 234, can be pulled towards the block 21, thereby rotating and retracting the arc rod 233, which facilitates the subsequent movement and retraction of the protective umbrella unit 2 and the anchoring unit 3 into the delivery sheath 13. A shielding strip 26 is fixed on the surface of the block 21, and the shielding strip 26 is fixed to the hollow filter 24 and the umbrella strip 234 respectively. With the setting of the shielding strip 26, blood is prevented from passing through the gap between the hollow filter 24 and the block 21.

[0064] Specifically, an elastic cover 37 is fixed to the surface of the anchor claw 33, and the elastic cover 37 is fixed to the surface of the block 21. The elastic cover 37 is made of elastic waterproof material, which can block blood and does not affect the normal rotation of the anchor claw 33. It should be noted that the materials used in this invention are all medical grade and will not have any effect on the human body.

[0065] During use, preoperative delivery and positioning: The folded protective umbrella unit 2 and anchoring unit 3 are delivered into the aortic arch through the delivery tube 11 medical hose. The guide wire 15 guides the device to be accurately positioned below the opening of the three cerebral blood supply branches. The delivery sheath 13 protects the device to avoid damage to blood vessels during the operation.

[0066] The protective umbrella and anchoring unit 3 deploy synchronously: After the delivery sheath 13 is withdrawn, the spring 237 outside the delivery pipe 11 rebounds, pushing the connecting block 235 to move. The movable rod 236 drives the umbrella strip 234 to rotate, unfolding the hollow filter screen 24 into an inverted cone shape to cover the three major branch openings. At the same time, the umbrella strip 234 drives the rotating shaft 22 to rotate, the guide post 312 slides along the guide groove 313, pushing the cylinder 322 to move. The ball 324 slides in the drive groove 323 to make the rotating cylinder 321 rotate, driving the anchor claw 33 to unfold and fit against the aortic sinus wall. When the anchor claw 33 rotates, the bevel gear 364 meshes with the fixed bevel rack 365 and rotates, driving the screw 363 to push the piston 361 to squeeze the air chamber 35 through the threaded tube 362. The gas is filled into the air bag 34 through the air hole 366 to increase the fit stability. At the same time, the gas in the filter screen is sucked out through the connecting pipe 367, so that the filter screen aperture is expanded to the interception threshold.

[0067] Intraoperative protection and postoperative retrieval: During TAVR, the hollow filter 24 intercepts detached thrombi / plaques, ensuring normal cerebral blood flow; during postoperative retrieval, the delivery tube 11 is pulled back, the connecting block 235 drives the umbrella strip 234 to close the filter, and at the same time, the anchor claw 33 rotates under the action of the torsion spring 325, the bevel gear 364 rotates in the opposite direction to make the piston 361 return to its position, the air bag 34 deflates, and the gas in the air chamber 35 is forced into the filter through the connecting tube 367 to reduce the filter pore size and wrap the thrombus; finally, the entire device is retracted into the delivery sheath 13 and removed from the body.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A transcatheter aortic valve replacement assist device, characterized in that: include, The delivery and recovery unit (1) includes a delivery tube (11) for aortic valve replacement assistance. A protective umbrella unit (2), installed on the delivery pipe (11) for intercepting thrombi, includes a block (21) fitted onto the surface of the delivery pipe (11), on which a rotating shaft (22) rotates, and on the rotating shaft (22) and the delivery and recovery unit (1) are an opening and closing component (23), on which a hollow filter screen (24) for intercepting thrombi is fixed; and, Anchoring unit (3), installed on block (21), is used to reduce the displacement of protective umbrella unit (2). It includes a transmission component (31) and a driving component (32) installed on block (21). The transmission component (31) cooperates with the rotating shaft (22), and the driving component (32) cooperates with the transmission component (31). An anchor claw (33) is fixed on the surface of the driving component (32). An air bag (34) is sleeved on one end of the surface of the anchor claw (33). An air cavity (35) is opened in the anchor claw (33). An inflation / deflation component (36) is installed on the block (21) and the anchor claw (33), and the inflation / deflation component (36) cooperates with the hollow filter (24) and the air bag (34) respectively. The inflation / deflation component (36) includes a piston (361) that slides within the air chamber (35). A threaded tube (362) is fixed to one side of the piston (361). A screw (363) rotates on the anchor claw (33). The screw (363) is threadedly connected to the threaded tube (362). A bevel gear (364) is fixed to one end of the screw (363). A bevel rack (365) is fixed on the block (21), and the bevel rack (365) meshes with the bevel gear (364). Both the anchor claw (33) and the airbag (34) have... An air hole (366) is provided, and the air chamber (35) is connected to the air bag (34) through the air hole (366). A connecting pipe (367) is fixed on the anchor claw (33), and the two ends of the connecting pipe (367) are respectively connected to the hollow filter (24) and the air chamber (35). A limiting groove (368) is provided in the anchor claw (33). A limiting block (369) is fixed on one end of the threaded tube (362), and the limiting block (369) slides in the limiting groove (368). The hollow filter (24) is made of medical elastic material.

2. The transcatheter aortic valve replacement assist device as described in claim 1, characterized in that: The bottom of the block (21) is fixed with a connecting pipe (12), and the connecting pipe (12) is sleeved on the surface of the conveying pipe (11). The surface of the connecting pipe (12) is sleeved with a conveying sheath (13), and the surface of the conveying pipe (11) is sleeved with a connecting pipe (14), and the connecting pipe (14) cooperates with the opening and closing part (23).

3. The transcatheter aortic valve replacement assist device as described in claim 2, characterized in that: The conveying pipe (11) is provided with a guide wire (15), and a telescopic pipe (16) is sleeved on the surface of the conveying pipe (11), with the two ends of the telescopic pipe (16) fixed between the block (21) and the opening and closing part (23).

4. The transcatheter aortic valve replacement assist device as described in claim 2, characterized in that: The opening and closing component (23) includes a short column (231) located on the circumference of the connecting pipe (14). Both ends of the short column (231) are embedded with ball bearings (232). An arc-shaped rod (233) is fixed between adjacent ball bearings (232). An umbrella strip (234) is fixed on the surface of the rotating shaft (22). One end of the umbrella strip (234) is fixed to the short column (231). A connecting block (235) is sleeved on the surface of the conveying pipe (11). The connecting block (235) cooperates with the connecting pipe (14). A movable rod (236) rotates between the surface of the connecting block (235) and the surface of the umbrella strip (234).

5. The transcatheter aortic valve replacement assist device as described in claim 4, characterized in that: A spring (237) is fitted on the surface of the conveying pipe (11), and the spring (237) is located inside the telescopic pipe (16). The two ends of the spring (237) are fixed to the surface of the block (21) and the surface of the connecting block (235), respectively.

6. The transcatheter aortic valve replacement assist device as described in claim 1, characterized in that: A movable block (311) slides inside the block (21), and a guide post (312) is fixed on the movable block (311). A guide groove (313) is opened on the surface of the rotating shaft (22), and the guide post (312) slides in the guide groove (313). A fixed block (314) slides inside the block (21), and the two ends of the fixed block (314) are fixed to the surface of the movable block (311) and the surface of the driving component (32) respectively. A T-shaped block (315) is fixed inside the block (21), and the movable block (311) slides on the T-shaped block (315).

7. The transcatheter aortic valve replacement assist device as described in claim 6, characterized in that: A rotating cylinder (321) rotates on the block (21), and a cylinder (322) slides inside the block (21). One end of the cylinder (322) slides on the inner wall of the rotating cylinder (321). A drive groove (323) is provided on the inner wall of the rotating cylinder (321). A ball (324) is embedded on the surface of one end of the cylinder (322), and the ball (324) slides in the drive groove (323). A torsion spring (325) is sleeved on the surface of one end of the rotating cylinder (321), and the two ends of the torsion spring (325) are fixed to the surface of the rotating cylinder (321) and the inner wall of the block (21) respectively. One end of the fixing block (314) is fixed to one end of the cylinder (322).

8. The transcatheter aortic valve replacement assist device as described in claim 4, characterized in that: An elastic band (25) is fixed on the hollow filter (24), and one end of the elastic band (25) is fixed to the surface of the short column (231). A shielding strip (26) is fixed on the surface of the block (21), and the shielding strip (26) is fixed to the hollow filter (24) and the umbrella strip (234) respectively.

9. The transcatheter aortic valve replacement assist device as described in claim 1, characterized in that: An elastic cover (37) is fixed to the surface of the anchor claw (33), and the elastic cover (37) is fixed to the surface of the block (21).

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