An implantable retrievable device for prevention of embolization
By designing an embolism prevention device comprising a support frame, connecting rod, reinforcing rod, and filter, the problem of the inability of existing technologies to effectively prevent the dislodgement of cardiogenic thrombi is solved. This device achieves stable fixation and convenient retrieval in the aortic arch, reducing the risk of drug anticoagulation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI FOURTH PEOPLES HOSPITAL
- Filing Date
- 2025-02-26
- Publication Date
- 2026-08-04
AI Technical Summary
There is a lack of devices in the current technology that can safely and effectively prevent the dislodgement of cardioembolic thrombi and prevent embolism, especially thrombus filtering devices that are difficult to install in the aortic arch, and existing methods rely on anticoagulants, which pose risks.
An embolism prevention device was designed, comprising a retrieval end and an implant. The implant consists of a support frame, a connecting rod, a reinforcing rod, and a filter. Utilizing shape memory alloy material and a barbed structure, it can be stably implanted into the aortic arch to cover the critical artery. Combined with a reversible groove shape for easy retrieval, it is equipped with a mesh polymer membrane to intercept thrombi.
It achieves stable fixation in the aortic arch, effectively intercepts thrombi, prevents them from reaching the brain and causing ischemic stroke, and allows for convenient recovery after thrombus dissolution, reducing the risk of drug anticoagulation.
Smart Images
Figure CN224584906U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical devices, specifically to an implantable retrievable device for preventing embolism. Background Technology
[0002] In certain pathological conditions, blood clots can easily form within the heart, known as cardiogenic thrombosis. Examples include thrombi forming in the left atrial appendage of patients with atrial fibrillation, thrombi forming within ventricular aneurysms after myocardial infarction, myxomas in the atria, and vegetations on heart valves. Once these thrombi detach, most can reach the brain via the carotid or vertebral arteries, causing acute ischemic stroke (IS), which, according to studies, leads to death or disability in approximately 70% of patients. If minimally invasive interventional or surgical treatment is performed at this time, the thrombus will detach and cause embolism. Currently, there is no protective device that can absolutely guarantee the complete recovery of detached thrombi. Therefore, current guidelines and expert consensus suggest that if cardiogenic thrombosis is detected, anticoagulants should generally be used first. However, during this process, thrombus detachment and embolism may occur. Furthermore, conventional thrombus filtering devices are difficult to install in the aortic arch. Utility Model Content
[0003] Purpose of the utility model: This application aims to overcome the defects of the prior art and provide an implantable retrievable device for preventing embolism.
[0004] Technical solution: An implantable retrievable device for preventing embolism includes a retrievable end and an implant connected to the retrievable end. The implant includes a support frame and multiple connecting rods connecting the retrievable end and the support frame. A reinforcing rod is connected between two adjacent connecting rods, and the reinforcing rod has barbs. Among the multiple connecting rods, there is a longest connecting rod with a length greater than the others. The end of the longest connecting rod near the support frame is connected to an abutment rod, which unfolds into an arc shape and is connected to the longest connecting rod at both ends. A filter is connected to the support frame.
[0005] Furthermore, the implant is asymmetrically shaped like a straw hat.
[0006] Furthermore, the recycling end has a first groove and a second groove, the opening of the first groove being located on one side of the recycling end, and the opening of the second groove being located on the other side of the recycling end.
[0007] Thus, the first and second grooves can be used for subsequent recycling, and the opening directions of the two grooves are opposite, making the recycling operation more convenient.
[0008] Furthermore, both the first groove and the second groove include a first plane, a second plane, and a connecting arc surface connecting the first plane and the second plane.
[0009] Therefore, the shapes of the first and second grooves are similar to the shape of a hook, which makes it more convenient for subsequent recycling operations.
[0010] Furthermore, the filter section is a mesh-like polymer material membrane.
[0011] This makes it more effective in intercepting blood clots.
[0012] Furthermore, both the connecting rod and the reinforcing rod are made of shape memory alloy.
[0013] This facilitates deployment and recovery.
[0014] Furthermore, the barbs are made of shape memory alloy.
[0015] Furthermore, there are six connecting rods and six reinforcing rods.
[0016] Furthermore, the implantable retrievable device is used to place in the aortic arch and can cover the brachiocephalic trunk, the left common carotid artery, and the left subclavian artery.
[0017] Beneficial effects: This patented device is implantable in the aorta for a period of time and can be retrieved to prevent the detachment of cardioembolic thrombi from causing ischemic stroke. The device is placed in the ascending aorta-aortic arch region, primarily covering the bifurcation of the brachiocephalic trunk, left common carotid artery, and left subclavian artery from the aorta, preventing thrombi from detaching and reaching the brain via these arteries, thus preventing ischemic stroke. Furthermore, the device can be promptly removed after anticoagulation therapy to dissolve the thrombus.
[0018] The device described in this application can be stably fixed in the aortic arch. Furthermore, the device described in this application is easier to retrieve during subsequent recovery operations. Attached Figure Description
[0019] Figure 1 This is a three-dimensional schematic diagram of the implantable recyclable device of this application;
[0020] Figure 2 This is a magnified view of region A;
[0021] Figure 3 This is a magnified view of region B.
[0022] Figure 4 A schematic diagram of the aortic arch for an implantable retrievable device;
[0023] Figure 5 This is a schematic diagram of an implantable recyclable device viewed from the support frame. Detailed Implementation
[0024] Reference numerals: 1. Recycling end; 1.1. First groove; 1.2. Second groove; 1.3. First plane; 1.4. Second plane; 1.5. Connecting arc surface; 2. Connecting rod; 3. Support frame; 4. Reinforcing rod; 4.1. Barb; 5. Abutting rod; 6. Filter screen; a. Brachiocephalic trunk; b. Left common carotid artery; c. Left subclavian artery.
[0025] As shown in the figure, an implantable retrievable device for preventing embolism includes a retrievable end 1 and an implant connected to the retrievable end 1. The implant includes a support frame 3 and multiple connecting rods 2 connecting the retrievable end 1 and the support frame 3. A reinforcing rod 4 is connected between two adjacent connecting rods 2, and the reinforcing rod 4 has barbs 4.1. Among the multiple connecting rods 2, there is a longest connecting rod with a longer length than the other connecting rods 2. The end of the longest connecting rod near the support frame 3 is connected to an abutment rod 5. The abutment rod 5 is arc-shaped when unfolded and both ends are connected to the longest connecting rod. A filter part 6 is connected to the support frame 3.
[0026] The retrieval end 1 has a first groove 1.1 and a second groove 1.2. The opening of the first groove 1.1 is located on one side of the retrieval end, and the opening of the second groove 1.2 is located on the other side of the retrieval end. The first groove 1.1 and the second groove 1.2 each include a first plane 1.3, a second plane 1.4, and a connecting arc surface 1.5 connecting the first plane 1.3 and the second plane 1.4.
[0027] The filter section is a mesh-like polymer membrane. Both the connecting rod and the reinforcing rod are made of shape memory alloy. There are six connecting rods and six reinforcing rods. The implantable retrievable device is placed in the aortic arch and can cover the brachiocephalic trunk, left common carotid artery, and left subclavian artery.
[0028] This application discloses an implantable retrievable device for intercepting detached cardiac thrombi to prevent ischemic stroke. The device is placed in the ascending aorta-aortic arch region, primarily covering the bifurcation of the brachiocephalic trunk, left common carotid artery, and left subclavian artery, preventing thrombi from detaching and reaching the brain via these arteries, thus preventing ischemic stroke. The device is applied intracardiacly by placing an umbrella-shaped filter in the ascending aorta. After thrombus dissolution via internal / surgical procedures or anticoagulation therapy, the device can be promptly removed. Furthermore, the implant's position is more stable after reaching the designated location due to the barbs at the reinforcing rod and the abutment rod against the body. For subsequent retrieval, the retrieval end has a first and a second groove with opposite opening directions, facilitating easy retrieval. The shape memory alloy material ensures the implant unfolds into the desired shape upon reaching the designated location and retracts within the delivery cable during retrieval.
[0029] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.
Claims
1. An implantable, retrievable device for prevention of embolization, characterized in that, The device includes a retrieval end and an implant connected to the retrieval end. The implant includes a support frame and multiple connecting rods connecting the retrieval end and the support frame. A reinforcing rod is connected between two adjacent connecting rods, and the reinforcing rod has barbs. Among the multiple connecting rods, there is a longest connecting rod with a length greater than the other connecting rods. The end of the longest connecting rod near the support frame is connected to an abutment rod. The abutment rod is arc-shaped when unfolded and both ends are connected to the longest connecting rod. A filter part is connected to the support frame.
2. The implantable, retrievable device for prevention of embolization of claim 1, wherein, The recycling end has a first groove and a second groove, the opening of the first groove is located on one side of the recycling end, and the opening of the second groove is located on the other side of the recycling end.
3. The implantable, retrievable device for prevention of embolization of claim 2, wherein, Both the first groove and the second groove include a first plane, a second plane, and a connecting arc surface connecting the first plane and the second plane.
4. The implantable, retrievable device for prevention of embolization of claim 1, wherein, The filter section is a mesh-like polymer membrane.
5. The implantable, retrievable device for prevention of embolization of claim 1, wherein, Both the connecting rod and the reinforcing rod are made of shape memory alloy.
6. The implantable, retrievable device for prevention of embolization of claim 1, wherein, There are six connecting rods and six reinforcing rods. The implantable retrievable device is placed in the aortic arch and can cover the brachiocephalic trunk, the left common carotid artery, and the left subclavian artery.