5results about How to "Prevent stenosis" patented technology

The invention relates to the technical field of medical instruments, and discloses a carotid artery micro-net woven stent. The stent comprises a stent main body divided into a stent middle part and a stent end part, the stent main body comprises a first stent, a second stent and a plurality of connecting structures, and the first stent and the second stent are both in a hollow pipe shape and are connected with each other through the connecting structures; the first support and the second support are connected at multiple positions through a plurality of connecting structures, so that movement of the first support and the second support can be limited, and the connecting structures comprise the first connecting structure and the second connecting structure. The two different connecting structures are arranged on the stent body, so that the requirement for different slippage degrees of the ends and the middle is met, layers of the intravascular stent are attached during use, the structural integrity of the stent is kept, the stent is tightly attached to a blood vessel, and good supporting and effective covering are achieved.

The invention relates to the technical field of door shunting, in particular to a door shunting covered stent, a manufacturing method and a stent system. The door body shunting covered stent comprises a stent body, the periphery of the stent body is covered with a covering part, and the covering part completely surrounds the stent body in the circumferential direction; the area, covered by the coating piece, of the stent body serves as a variable-diameter area, and the yield strength of the coating piece area corresponding to the variable-diameter area is larger than the acting force applied to the coating piece when the variable-diameter area is subjected to self-expansion. After the portal shunt covered stent is implanted into a human body, the variable-diameter area is expanded through the balloon when necessary. When the wrapping part is expanded and the expansion force is greater than the yield strength of the wrapping part, accurate expansion to the expansion size of the balloon can be realized, so that the size of the variable-diameter area is within the maximum diameter, and the expanded size can be accurately controlled.

This invention discloses a dynamic pressure-adaptive arterial puncture closure system and method, relating to the field of medical device technology. The system includes: a pressure sensing module for acquiring pressure distribution information at different circumferential locations within the blood vessel and sensing pulsating pressure signals in real time; an intelligent control module electrically connected to the pressure sensing module for receiving and processing the pulsating pressure signals and generating dynamic closure control commands according to a preset adaptive algorithm; and a mechanical execution module electrically connected to the intelligent control module for receiving the dynamic closure control commands and driving the closure element to apply a dynamically adjustable radial closure force to the arterial puncture site. This invention can adapt to the dynamic changes in the patient's blood pressure in real time and automatically. Through a dynamic pressure adaptive mechanism, it achieves a fundamental shift from "static compression" to "dynamic adaptive compression," minimizing vascular wall damage while ensuring hemostasis and significantly reducing the risk of complications.

The present invention discloses a valve clamping system, including a valve clamping device and a clamping state monitoring device, wherein the valve clamping device includes a catheter, a valve clamping mechanism, and a clamping handle mechanism; a control rod is arranged in the catheter, and the distal end of the control rod is detachably connected to the valve clamping mechanism, and the proximal end is connected to the clamping handle mechanism; the clamping state monitoring device includes a blood pressure collection mechanism and a blood pressure analysis and judgment mechanism; the valve clamping mechanism includes a connecting component, a clamping component, a driving component, and a locking component; the clamping component includes a clamping arm and a clamping sheet; the driving component includes a clamping arm driving component and a clamping sheet driving component, the clamping arm is unfolded by the clamping arm driving component and is attached to the clamping sheet to clamp the valve leaflet, and is gathered into a bundle by the clamping arm driving component; the clamping sheet driving component gathers the freely unfolded clamping sheet into a bundle toward the center. The present invention accurately determines whether the clamping is appropriate by real-time monitoring of atrial blood pressure, improves the success rate of the operation, stabilizes the clamping locking, and easily realizes the recovery of the clamping mechanism.

This invention relates to a biliary stent material, its preparation method, and its application, belonging to the field of biliary stent technology. A method for preparing a biliary stent material includes the following steps: dissolving 4-(ethylene glycol ketal)-ε-caprolactone and caprolactone copolymer in an organic solvent, then adding barium sulfate to obtain a mixed solution; after the organic solvent in the mixed solution evaporates, a composite casting membrane is obtained; the composite casting membrane is coated onto the surface of a mold, heated, cooled, and the mold is removed to obtain a tubular stent; the tubular stent is immersed in a dopamine hydrochloride buffer solution and stirred to obtain a tubular stent loaded with a polydopamine coating; curcumin is added to an amnion decellularized hydrogel solution to obtain a composite hydrogel solution; the tubular stent loaded with the polydopamine coating is then immersed in the composite hydrogel solution and allowed to gel statically to obtain the biliary stent material. The biliary stent material of this invention has the characteristics of being biodegradable, having good flexibility, and excellent biocompatibility.