7 results about "Urethral stents" patented technology

The utility model discloses a double -deck urethral support with medicine carrier, including metal support, both ends of metal support are reverse coiling setting, metal support includes inner layer and outer layer, the fixed connection through multiple connecting keys between inner layer and outer layer, be provided with the medicine storage bag in the inner layer, the fixed connection through multiple dissolving keys between medicine storage bag and inner layer, the utility model discloses can increase the support of support, improve the use efficiency of medicine, reduce side effect, and the use effect is better after urethral support installation, and can be to urethral damaged tissue automatic medicine, accelerate the repair of urethra inner wall damaged tissue.

The utility model belongs to the technical field of urethral stents, in particular to a urethral stent with a medicine guide structure, which comprises a urethral stent main body and a shunting groove, the shunting groove is arranged in the urethral stent main body, an annular groove is arranged on one side of the urethral stent main body close to the shunting groove, and the shunting groove is communicated with the annular groove. According to the urethral stent with the medicine guiding structure, after the urethral stent is inserted into the urethra, the urethra is kept unobstructed, when the urethral stent is inserted into the urethra and medicine needs to be applied, the butt joint pipe is rotated, the first thin film is punctured by the puncture needle, the liquid medicine bag is extruded to deform, and liquid medicine in the liquid medicine bag is guided to the urethra wall through the diversion groove; when the liquid medicine in the liquid medicine bag is used up, an injection needle tube and the like are used for puncturing the second film to inject the liquid medicine, the injected liquid medicine is in contact with the urethra wall through the diversion groove, and the urethra support is inserted into the urethra to facilitate local medicine application.

The invention discloses a degradable magnesium alloy urethral stent and a preparation method thereof, the chemical composition expression of the degradable magnesium alloy urethral stent is Mg-xM-yR, M is one or more of Zn, Ce and Mn, and R is one or more of Ta, Sc and Y; x and y are mass fractions (wt.%) of M and R: x is greater than or equal to 4 and less than or equal to 7, and y is greater than or equal to 1 and less than or equal to 4; the preparation method sequentially comprises the following steps: preparing magnesium alloy, preparing magnesium alloy wires and preparing the net-shaped stent. According to the prepared urethral stent, a multi-metal hydroxide composite film layer can be rapidly generated in situ in a urethral environment, the corrosion resistance of the stent in the urethral environment can be improved through the composite film layer, and controllable degradation time is achieved; meanwhile, metal ions dissolved out of the membrane layer can promote endothelial cell adhesion in a urethral environment, and a biological membrane is prevented from being colonized on the surface of the stent.

The invention discloses an anti-displacement degradable urethral stent with a time sequence degradation regulation and control function, and relates to the technical field of medical instruments, the anti-displacement degradable urethral stent comprises a degradable stent main body, an anchoring hook structure arranged at at least one end of the degradable stent main body, and an adjustable degradable coating covering the surface of the degradable stent main body. By arranging the differentiated coating areas, the degradation rate of the coating on the surface of the anchoring hook structure is higher than or smaller than that of the coating on the surface of the stent body, and function time sequence attenuation is achieved: in the early stage of implantation, the anchoring hook keeps high strength so as to provide reliable axial anti-displacement fixation; after the tissue is stabilized, the anchoring hook is softened or degraded prior to the main body, the mechanical stimulation to the urethral mucosa is actively eliminated, and the main body continues to maintain the support until the final overall absorption. Time sequence function transition from early-stage strong fixation to later-stage low stimulation is achieved, the clinical contradiction between strong anchoring and long-term stimulation is effectively solved, the early-stage disintegration risk and the secondary extraction operation of the stent are avoided, and the safety and effectiveness of treatment and the comfort degree of a patient are remarkably improved.

The present application relates to a urethral stent, comprising a tubular stent body and a retrieval portion, the stent body is composed of metal wires, the retrieval portion is arranged at least one end of the stent body in axial direction, the retrieval portion has a closed outer convex surface for cooperating with a catcher, and the maximum radial dimension of the retrieval portion is greater than the wire diameter of the metal wires. By setting the retrieval portion as a structure with a closed outer convex surface, the stable three-dimensional geometric shape can be maintained in cold water environment, and the structural support force will not be lost due to temperature reduction, so as to provide a stable and reliable catching support point for the catcher, effectively avoid the support point failure and slipping phenomenon caused by structural deformation in the catching process, reduce the number of repeated operations, shorten the operation time and reduce the pain of patients.

The invention provides a nickel-titanium alloy urethral stent with an anti-calculus and antibacterial dual-function coating and a preparation method, and belongs to the technical field of medical instruments. The zwitterionic molecular chain and the cationic molecular chain are covalently grafted on the surface of the nickel-titanium alloy urethral stent to form a bifunctional coating, so that synergistic integration of anti-calculus and antibacterial properties is realized. The dynamic hydration layer of the zwitterionic chain can efficiently block crystal deposition, the cationic chain plays a bactericidal role by destroying bacterial cell membranes, and the coating is firmly combined with the substrate and has excellent biocompatibility. According to the technology, the problems that an existing urethral stent is prone to scaling and infection are remarkably solved, and the medical nickel-titanium stent which has clinical application prospects and has the anti-calculus and antibacterial functions is provided.

The utility model discloses a urethral stent tube for continuous urethral irrigation, which comprises a urethral stent tube body, an air bag, an irrigation hole and an air tube are arranged on the urethral stent tube body, an inner cavity is arranged inside the urethral stent tube body, and the air tube is axially arranged along the urethral stent tube body and is connected with the air bag; a liquid inlet is formed in the urethral stent tube body, a liquid inlet hose is connected to the liquid inlet, a passage control part is arranged on the liquid inlet hose, and the passage control part can block an internal passage of the liquid inlet hose in a normal state and opens the internal passage of the liquid inlet hose only in a stress driving period. The utility model has the following advantages and effects: on the premise of meeting continuous urethral flushing, quick controllability and on-demand start and stop of urethral flushing are realized, waste and infection risks caused by continuous leakage of flushing fluid are effectively avoided, and the convenience and instant effect of flushing operation are remarkably improved.