43 results about "Av graft" patented technology

The invention provides a self-sealing arteriovenous graft including a tube having a polymeric inner layer defining a lumen through which blood may flow and an outer textile layer. The outer textile layer is concentrically disposed about the inner layer. Furthermore, an intermediate self-sealing layer is concentrically positioned between the inner and outer layers. The self-sealing layer includes a biocompatible polymer.

It is intended to provide a lactide/epsilon-caprolactone copolymer for a flexible medical implant which has extremely high safety without containing a higher alcohol and is useful for producing a medical implant required to have flexibility such as artificial dura mater or artificial blood vessel. Further, it is intended to provide a method for producing the copolymer, a medical implant and artificial dura mater comprising the copolymer. The invention is directed to a lactide/e-caprolactone copolymer to be used for medical implant application, wherein a molar ratio of lactide to e-caprolactone (lactide/e-caprolactone) is from 40/60 to 60/40, a weight average molecular weight is 100,000 to 500,000 or less, a higher alcohol component is not contained, and a melting enthalpy of crystal obtained by heat-melting the copolymer to form a molded article is 10 J/g or less.

An intraoperative stent system, comprising an artificial blood vessel portion (4) and a main stent portion (5) sutured together with the artificial blood vessel portion (4); the intraoperative stent system also comprises a side branch stent portion (6), the side branch stent portion (6) transversely extending outward from the artificial blood vessel portion (4) or the main stent portion (5), and connecting to and communicating with the artificial blood vessel portion (4) or the main stent portion (5). The intraoperative stent system saves operation time and reduces operation difficulty.

A method for preventing stenosis and thrombosis of an AV graft is disclosed. An essential fatty acid emulsion is administered to the patient through the AV graft, preferably during dialysis, whereby the anti-inflammatory properties of the essential fatty acid emulsion prevent complications typical of AV grafts.

The invention discloses a suturing-free stent artificial blood vessel, a conveying device thereof and a coincident retaining ring, relates to the technical field of medical instruments and aims to solve the problems of blood leaking and complication caused by the fact that existing artificial blood vessels are difficult in coinciding and too long in coinciding time. The suturing-free stent artificial blood vessel comprises an artificial blood vessel body composed of a line-forming portion artificial blood vessel and a non-line-forming portion artificial blood vessel which are connected sequentially, and an elastic metal stent is arranged on the non-line-forming portion artificial blood vessel; a suturing-free connecting portion is arranged on the line-forming portion artificial blood vessel and composed of a coating member and a supporting sleeve ring, the coating member is positioned on the outer side of the line-forming portion artificial blood vessel and coaxially and seamlessly connected with the same, and the supporting sleeve ring is put between the coating member and the line-forming portion artificial blood vessel.

The invention relates to a suture-free integrated branch covered stent blood vessel, and belongs to the technical field of medical instruments. The suture-free integrated branch covered stent blood vessel comprises an artificial blood vessel, a membrane-covered stent and a pressure re assembly; The distal end of the artificial blood vessel is connected with the proximal end of the covered stent. The pressure ring assembly comprises a pressure ring and a fixing member. The outer wall of the artificial blood vessel is provided with a fixing part. One end of the pressure ring is movably connectedto the fixing member so that the pressure ring can change the position of the pressure ring relative to the artificial blood vessel around the fixing member. The suture-free integrated branch coveredstent blood vessel use that elasticity of the compression ring to clamp and seal the anastomotic stoma and avoid the anastomotic stoma suture method in artificial blood vessel replacement operation,so as to achieve the effect of hemostasis and reducing the operation time.

The invention discloses a biodegradable vascular anastomotic device, a special surgical instrument and a method of use thereof, which are used for anastomosis between human blood vessels, between artificial blood vessels, or between human blood vessels and artificial blood vessels. The vascular anastomosis device consists of a The first anastomotic ring/wheel and the second anastomotic ring/wheel are coaxial with each other, and the anastomotic ring/wheel includes a blood vessel support stent, a clamping stent, and anastomotic needles distributed circumferentially at the free end of the vascular support stent. The anastomosis surface of the blood vessel anastomosis device of the present invention has a coaxial geometric structure, the anastomosis is efficient, the anastomosis area is large, the success rate of the operation is improved and the collapse of the anastomotic stoma is reduced. The present invention is made of biodegradable materials. Through reasonable structural design, the vascular anastomotic ring/wheel can be degraded by the human body after operation, and maintain a relatively complete structure during the degradation process. Maintain the corresponding effective support time to maintain the function of the vascular anastomosis ring/wheel, and avoid the risk of foreign body residue caused by traditional mechanical anastomosis methods. The special instrument provided by the invention integrates the functions of clamping and anastomosis, which simplifies the operation process and improves the operation efficiency.

The invention provides a composite type intraoperative stent system which comprises an artificial vessel capable of being anastomosed, a linear control released left subclavian artery covered stent vessel and a balloon-expandable type descending aorta covered stent artificial vessel; the artificial vessel is connected with the balloon-expandable type descending aorta covered stent artificial vessel; the left subclavian artery covered stent vessel is arranged at the connecting part of the artificial vessel and the balloon-expandable type descending aorta covered stent artificial vessel and communicates with the artificial vessel and the balloon-expandable type descending aorta covered stent artificial vessel; and the balloon-expandable type descending aorta covered stent artificial vessel is internally provided with a balloon. The composite type intraoperative stent system can shorten the operation time, reduces influence of deep hypothermic circulatory arrest on the coagulation function of a patient, lowers the difficulties of vascular anatomy and anastomosis and increase the success rate of an operation.

The invention discloses an arcus aortae stent graft vascular structure for the department of surgery. The structure comprises a first artificial blood vessel, a connecting ring and a second artificial blood vessel. The connecting ring is embedded into the exterior of one side of the first artificial blood vessel. A reflection portion is reserved at the connecting ring and the end of the first artificial blood vessel. The reflection portion is turned outwards to wrap the connecting ring to form the compound end. One end of the second artificial blood vessel is embedded at the compound end to form a connecting portion. A threading hole is formed in the peripheral side wall of the connecting ring. A first branch and a second branch are arranged on the periphery of the first artificial blood vessel. The first branch comprises a first forked portion for being connected with an innominate artery and a second forked portion for being connected with the left common carotid artery. The second branch is connected with a pump blood vessel and then disconnected with the left subclavian artery. The second artificial blood vessel is the stent graft artificial blood vessel, and the far end of the second artificial blood vessel is used for being connected with the thoracic descending aorta.

The invention discloses a simple quick-connection structure for an artificial blood vessel. The simple quick-connection structure for the artificial blood vessel comprises the artificial blood vessel, one side of the artificial blood vessel is nested with a connecting ring and two or more pairs or rows of thread penetrating holes are formed in the side wall in the circumferential direction of the connecting ring. The diameter of the artificial blood vessel is smaller than or equal to 30 mm. The diameter of the connecting ring is smaller than or equal to 30 mm. The diameter of the connecting ring is equal to that of the artificial blood vessel. The two or more pairs of thread penetrating holes are evenly formed in the side wall in the circumferential direction of the connecting ring so as to be beneficial to firmly connecting the broken ends of two artificial blood vessels. The width of the connecting ring ranges from 10 mm to 35 mm. The two or more rows of thread penetrating holes are formed in the connecting ring, and two or more thread penetrating holes are in one row.

The invention discloses an anastomosis fastening ring for main arteries and an artificial blood vessel assembly with the anastomosis fastening ring, and relates to the technical field of medical apparatus and instruments. The anastomosis fastening ring for the main arteries comprises a fastening ring body. The fastening ring body is of an annular opening structure, and first instrument operating holes are respectively formed in two sides of an opening in the fastening ring body; a first fastener is arranged at one tail end of the fastening ring body, a second fastener is arranged at the other tail end of the fastening ring body, and the first fastener and the second fastener are locked with each other in an insertion manner, so that the anastomosis fastening ring for the main arteries can be used for sleeving sleeve rings of artificial blood vessels; the diameter of the anastomosis fastening ring for the main arteries can be decreased along with increase of the quantity of mutual insertion locking overlapped portions of the first fastener and the second fastener; the diameter of the anastomosis fastening ring for the main arteries can be increased along with decrease of the quantity of the mutual insertion locking overlapped portions of the first fastener and the second fastener. The anastomosis fastening ring and the artificial blood vessel assembly have the advantage that the technical problems of inconvenience in operation and difficulty in adjustment when existing sleeve rings of existing artificial blood vessels are fixedly tied off by existing silk sutures (or silk ribbons) can be solved by the aid of the anastomosis fastening ring and the artificial blood vessel assembly.

The invention discloses an artificial blood vessel and covered stent connection mechanism for an aortic operation. The connection mechanism comprises an artificial blood vessel and a covered stent, the artificial blood vessel and the covered stent are connected into an integrated structure through an inner ring made of a hard material, the outer side of the inner ring is sleeved with a fixing ring, and the difference of the radius of the inner circle of the fixing ring and the radius of the outer circle of the inner ring is equal to or smaller than the wall thickness of the blood vessel so that the blood vessel can be clamped between the inner circle of the fixing ring and the outer circle of the inner ring, and the step of sewing or binding is omitted. Besides, connection is more stable, more reliable and quicker, bleeding complications are not likely to happen, and the risk of operations is effectively reduced.

The invention relates to a method for preparing a live animal eye model by a retinal vein artificial blood vessel bypass operation. The method comprises the following steps of: selecting experimental pigs, dogs, sheep and monkeys, artificially causing branch retinal vein occlusion in advance and then performing vitrectomy; setting a point on each of blood vessels on two sides of the occlusion as a starting point and an end point of a vascular bypass respectively, designing a bending curvature, length and acute end angles by taking a macromolecular material microtubule as an artificial blood vessel; and after the artificial blood vessel is introduced into an eye, puncturing vessel walls at the position of the set starting point and the set end point by two acute ends and inserting the two acute ends into the artificial blood vessel sequentially, wherein punctured pores are automatically closed or are promoted to be closed by performing electric coagulation on the blood vessel if necessary. By establishing the live animal eye model used for the research on the time, the effect and the security of curing the branch retinal vein occlusion by the retinal vein artificial blood vessel bypass operation, the method lays a research foundation for developing a new clinical surgery method.

The invention provides a method for constructing engineering arterial blood vessel in vivo by taking melt-spinning fiber as a skeleton. The method comprises the following steps: firstly preparing a melt spinning and medical silica gel tube composite mandrel, and then preparing the in-vivo engineering arterial blood vessel taking melt-spinning fiber as a skeleton by taking subcutaneous part of an animal as a bioreactor; the specific steps are as follows: 1) preparing the melt spinning and medical silica gel tube composite mandrel; 2) preparing the in-vivo engineering arterial blood vessel taking melt-spinning fiber as a skeleton by taking subcutaneous part of an animal as a bioreactor; and 3) performing in-situ transplanting of the in-vivo engineering arterial blood vessel so as to replace lesion blood vessels. The method has the advantages that the in-vivo engineering arterial blood vessel has good biocompatibility, all the components are originated from autologous tissues, and therefore, the artificial blood vessel is non-toxic, free from immunogenicity, and incapable of causing inflammation; due to the existence of melt spinning fiber, the prepared in-vivo engineering blood vessel has good mechanical strength, tenacity and compliance, and is suitable for surgical sewing operation.

The invention discloses an artificial vascular conduit with a hemline and a suturing method thereof. The artificial vascular conduit with the hemline comprises an artificial blood vessel; a connectingend of the artificial blood vessel is connected with an artificial valve; a suture ring is connected to the outside of the end of the artificial valve which is connected with the artificial blood vessel; and a hemline is connected with an outer ring surface of the suture ring. The artificial vascular conduit with the hemline disclosed by the invention is a combination of the artificial blood vessel, the artificial valve, the suture ring and the hemline. In the process of using, when the artificial vascular conduit with the hemline is being sutured with an aortic annulus, the artificial vascular conduit is capable of reducing the risk of bleeding and oozing of blood along the suture line of the suture ring and the aortic annulus, thereby facilitating improvement of success rate of a wholeoperation; and moreover, the whole suturing process is easy and convenient to operate, and performance of the suture operation is facilitated.

The invention discloses a built-in device for an individualized branch stent type arch part reconstructed artificial blood vessel and relates to an artificial blood vessel. The built-in device aims atsolving the problems of large bleeding amount, long deep low-temperature circulation stopping time, possible spinal cord damage and the like in an operation process of a patient due to the fact thatexisting full arch replacement operations cannot achieve precise control over bleeding of an arch part and a descending operation field, so that the operation death rate and the complication rate arehigh. The device comprises hard arch parts (20), wherein the hard arch parts (20) are arc-shaped pipelines identical in pipe diameter, and the curvature radii of the hard arch parts are identical or the curvature radii gradually decrease from a proximal end to a distal end; a plurality of branch windows and annular dents (24) are formed in the hard arch parts (20), and the hard arch parts (20) aremounted in an arch part aortic stent blood vessel section of the individualized branch stent type arch part reconstructed artificial blood vessel (3). The device is used for an aortic arch replacement operation.

The invention discloses an artificial vascular anastomosis trainer and a using method thereof. First, a fixed bracket is made on a workbench board, and two artificial blood vessels are placed on the fixed bracket. Of the two artificial blood vessels, one is a scalable artificial blood vessel, and the other is a conventional artificial blood vessel. One end of the scalable artificial blood vessel is connected with a three-phase joint, the other two ends of the three-phase joint are respectively connected with a piezometer tube and a liquid injection tube, and the mouth at the other end of the scalable artificial blood vessel faces the mouth at one end of the conventional artificial blood vessel. During operation practice, a medical care worker adjusts the scalable artificial blood vessel according to the position of the blood vessel to make the scalable artificial blood vessel and the conventional artificial blood vessel sutured together, and then, the medical care worker injects dye with color into the liquid injection tube. When the dye with color flows through the joint of the scalable artificial blood vessel and the conventional artificial blood vessel, whether there is leakage and whether there is suturing defects can be observed. Therefore, the practice efficiency of medical care workers is improved.