Abstract: A left atrial appendage occluder comprises an elastic closure disc, and a supporting structure connecting with the closure disc and being located on one side of the closure disc, with the supporting structure comprising a central end connecting with the closure disc and a plurality of interconnected and bent struts, wherein at least one anchoring thorn is set near the end of at least one strut with the anchoring thorn toward the closure disc. The left atrial appendage occluder has a stable structure, a good positioning and sealing effect on the cavity wall in the left atrial appendage, and it is easy to position repeatedly; it can also be recycled before separating from a conveyor. When in surgical operation, the left atrial appendage occluder can select the position area based on the actual shape and size of the patient's left atrial appendage, so the surgical risk is lowered.

Abstract: A luminal stent has a tube body and a skirt surrounding the tube body. The skirt has a flexible connecting section and a stent graft connected to a proximal end of the flexible connecting section. A distal end of the flexible connecting section is sealed and connected to the outer surface of the tube body. A proximal end of the stent graft is suspended and provided with a first radial support structure. When the flexible connecting section is radially compressed, at least a part of the first radial support structure is bent towards a direction distant from the tube body. Also provided is a stent system including the luminal stent. The stent system and the luminal stent can prevent type III endoleaks.

Abstract: A left atrial appendage occluder comprises an elastic closure disc, and a supporting structure connecting with the closure disc and being located on one side of the closure disc, with the supporting structure comprising a central end connecting with the closure disc and a plurality of interconnected and bent struts, wherein at least one anchoring thorn is set near the end of at least one strut with the anchoring thorn toward the closure disc. The left atrial appendage occluder has a stable structure, a good positioning and sealing effect on the cavity wall in the left atrial appendage, and it is easy to position repeatedly; it can also be recycled before separating from a conveyor. When in surgical operation, the left atrial appendage occluder can select the position area based on the actual shape and size of the patient's left atrial appendage, so the surgical risk is lowered.

Abstract: A bifurcated stem graft (10) comprises a body (100) and a side branch (200) that forms an acute angle with the body (100). The side branch (200) comprises a covering film (220) and a first bare stent (240) only disposed on the covering film (220). Part of the first bare stent (240) is positioned adjacent a boundary line (230) of the body (100) and the covering film (220) and is located in a vertex angle area (250) of the acute angle. Due to the fact that part of the first bare stem (240) is attached to the vertex angle area (250), after the stem (10) is released, the self-expanded part of the first bare stent (240) enables the vertex angle area (250) of the side branch (200) to be effectively supported, the covering film is not prone to shrinkage, and a leading wire can enter easily.

Abstract: The present invention relates to a steerable sheath tube (100) including a tube body (110), a traction mechanism (120) and a fixing and connecting mechanism (130). The traction mechanism (120) includes an anchor ring (121) and a traction wire (122). The anchor ring (121) is coaxially embedded in a distal elastic segment (111) of the tube body (110). The traction wire (122) is arranged in a side wall of the tube body (110), and extends along the axial direction of the tube body (110). The traction wire (122) includes a first segment and a second segment connected to each other, wherein the first segment is connected to the fixing and connecting mechanism (130) near a proximal end of the tube body (110), and the second segment hooks the anchor ring (121).

Abstract: A luminal stent includes a first tubular body and a second tubular body sleeved on the first tubular body, and at least one end of the second tubular body is sealingly connected to an outer surface of the first tubular body. In a radial support section of the luminal stent, the first tubular body includes at least one first radial support structure arranged in a circumferential direction thereof, and the second tubular body includes at least one second radial support structure arranged in a circumferential direction thereof and a coating film covering the second radial support structure. The second radial support structure has greater radial deformability than the first radial support structure. After implantation, the luminal stent can form a semi-closed gap between the first tubular body and the second tubular body or between the second tubular body and a lumen wall.

Abstract: Provided are an iron-based absorbable and implantable medical device and manufacturing method thereof. The iron-based absorbable and implantable medical device (1) comprises a substrate (11), a degradable polymer layer (12), and an anionic surfactant layer (13) located between the substrate (11) and the degradable polymer layer (12). The anionic surfactant, by using the hydrophobicity thereof, can form a hydrophobic barrier layer in a solution to isolate a surface of the iron-based substrate (11) from a body fluid environment, thereby avoiding direct contact with an acidic environment resulting from degradation of the degradable polymer layer (12) at the initial and early stages of implantation, thus preventing severe local corrosion of the iron-based substrate (11).

Abstract: Disclosed is an implanted device, comprising a device base body and an active drug, wherein the device base body is pure zinc and/or a zinc alloy, the zinc content in the device base body is 0.1-100%, and the active drug comprises anti-allergic drugs. After the implantation of the implanted device into the human body, the surrounding tissues of the implant would not have a clear hypersensitive reaction due to the presence of the anti-allergic drugs, and the implanted device can be used to be implanted into the body for supporting organ chambers, to fill the hollow chambers of the organs and tissues or as orthopaedic implants etc.

Abstract: A lumen stent includes a first tube body and a second tube body. The second body is sleeved outside the first body and has at least one end in hermetic connection with the outer surface of the first body. The second body includes a thin film body that covers at least part of the first body and a second radial supporting structure that is disposed in a maximum radius-length region of the thin film body and surrounds the maximum radius-length region. The second radial supporting structure has radius supporting property. After the implantation of the lumen stent, a semi-enclosed gap can be formed between the first body and the second body, or a semi-enclosed gap can be formed between the second body and a tube wall, so that blood flowing into the gap can serve as a filling material and prevent blood from flowing into a tumor body.

Abstract: An artificial heart valve stent including: a tubular stent body having an inflow side end and an outflow side end, the inflow side end and the outflow side end being opposite to each other; an inflow side skirt surrounding the external wall of the stent body; and an outflow side skirt surrounding the external wall of the stent body. In a spread state, free ends of the inflow side skirt and the outflow side skirt extend toward the inflow side end; and the inflow side skirt cooperates with the outflow side skirt to clamp heart valve tissues. The artificial heart valve stent can be steadily arranged on heart valve tissues, prolong the service life of an artificial heart valve and reduce the risk of another artificial heart valve replacement for the patient.

Abstract: An iron-based alloy absorbable and implantable medical device for internal fixation. A substrate includes an iron-based alloy and degradable polymer. The mass ratio of the iron-based alloy to the degradable polymer is between 1:4 and 4:1. The weight-average molecular weight of the degradable polymer is between 150000 to 3000000, and the polydispersity index thereof is between 1 and 6. The device further includes antioxidants. The iron-based alloy is used as a load-bearing framework or reinforcement phase of the device. By adjusting the mass ratio of the iron-based alloy to the degradable polymer and the combination mode thereof, the corrosion rate of the iron-based alloy in the late period of the implantation is accelerated, and the quantity of corrosion products poorly soluble in the iron-based alloy is reduced. Adding antioxidants to the device further reduces the quantity of the corrosion products poorly soluble in the iron-based alloy.

Abstract: A high-speed precision interrupted ultrasonic vibration cutting method includes steps of: (1) installing an ultrasonic vibration apparatus on a machine tool, and stimulating a cutting tool to generate a transverse vibration, so as to realize varieties of machining processes; (2) realizing an interrupted cutting process by setting cutting parameters and vibration parameters to satisfy an interrupted cutting conditions; and (3) turning on the ultrasonic vibration apparatus and the machine tool, and starting a high-speed precision interrupted ultrasonic vibration cutting process. High-speed precision interrupted ultrasonic vibration cutting is able to be realized through the above steps during machining of difficult-to-machine materials in aviation and aerospace fields.

Abstract: Absorbable iron-based alloy implanted medical device and manufacturing method thereof. The iron-based alloy implanted medical device comprises an iron-based alloy substrate (11), a degradable polymer layer (13) disposed on a surface of the iron-based alloy substrate (11), and a tannic acid chemical conversion film (12) disposed on a surface of the iron-based alloy substrate (11). After the medical device is implanted into a body, the tannic acid chemical conversion film (12) is configured to protect the iron-based alloy substrate (11) coated thereby from being in contact with a body fluid, thereby ensuring that the device meets a clinical mechanical property requirement in the early stage of implantation. Furthermore, the iron-based alloy implanted medical device has a decreased size, and produces a decreased amount of a corrosive product after being implanted, facilitating faster absorption or elimination of the corrosive product.

Abstract: An absorbable implantable medical device made of iron-based alloy, including a base made of iron-based alloy and a complex, wherein the complex includes a complexing agent. In a physiological solution, the base made of iron-based alloy can react with the complexing agent to generate a water-soluble iron complex having solubility in the physiological solution of no less than 10 mg/L. A corrosion product generated after the absorbable implantable medical device made of iron-based alloy is implanted in a human body can be quickly metabolized/absorbed by the body.

Abstract: An absorbable iron-based alloy implantable medical device includes an iron-based alloy matrix, a degradable polymer coating disposed on the surface of the iron-based alloy matrix, and a corrosion inhibition layer disposed on the surface of the iron-based alloy matrix. The corrosion inhibition layer can delay early-stage corrosion of the iron-based alloy matrix, ensure mechanical performance of a medical device in the early stage of the implantation, prevent degradation of a polymer in the early stage of the implantation of the medical device, and reduce the usage of the degradable polymer, thereby reducing risks of inflammatory reactions.

Abstract: An elliptical ultrasonic machining device powered by non-contact induction mainly includes an induction power supply device and an elliptical ultrasonic spindle shank, wherein: induction power supply secondary units of the induction power supply device encircle a spindle shank shell of the elliptical ultrasonic spindle shank; induction power supply primary units are arranged at a primary magnetic core seat outside the elliptical ultrasonic spindle shank; the primary magnetic core seat and the elliptical ultrasonic spindle shank have a same circle center, and a small gap exists between the primary magnetic core seat and the elliptical ultrasonic spindle shank; the primary magnetic core seat is fastened on a machine tool spindle seat of a machine tool through a support and keeps still; the elliptical ultrasonic spindle shank is mounted on a machine tool spindle through a taper shank and rotates with the spindle in a high speed.

Abstract: The invention discloses an absorbable iron-based alloy stent, comprising an iron-based alloy substrate and a degradable polyester in contact with the surface of the substrate, in which the degradable polyester has a weight average molecular weight of between 20,000 and 1,000,000 and a polydispersity index of between 1.2 and 30. With the degradable polyester, the iron-based alloy is capable of corroding rapidly and controllably within a predetermined period. Following implantation into the human body, the degradable stent serves as a mechanical support at early stage, then gradually degrading and being metabolized and absorbed by the human body. During the process of degradation, minimal or no solid product is produced. Ultimately, the configuration of the lumen with an implanted stent as well as the systolic and diastolic functions thereof return to their natural states.

Abstract: An iron based and absorbable implanted prefabricated tube (1) for medical device and preparation method therefor, and a medical device prepared by the prefabricated tube and preparation method therefor. The average nitrogen content of nitrogen in the prefabricated tube is from 0.04-0.4 wt. % or 0.02-0.04 wt. %. The prefabricated tube can be cut along the length direction directly by laser or by machining to obtain multiple absorbable implanted medical devices.

Abstract: An absorbable occluder (100) comprises a woven mesh (110), wherein the woven mesh (110) comprises at least two polymer filaments with different centralized degradation time periods, or comprises a polymer filament made by blending at least two polymers with different centralized degradation time periods. The absorbable occluder (100) can avoid the tissue inflammatory response caused by the polymer filaments of the woven mesh (110) centralized degrading within the same period.

Abstract: The present invention relates to a thoracic aortic covered stent (100), comprising a bare stent segment (110) and a covered stent segment (120). The bare stent segment (110) comprises a bare wave-shaped ring (111); the covered stent segment (120) has a lesser curvature side region (100c), a greater curvature side region (100a), and two opposite intermediate regions (100b) located between the lesser curvature side region (100c) and the greater curvature side region (100a) respectively; and the covered stent segment (120) comprises a first proximal wave-shaped ring (121).