30 results about "Av graft" patented technology

The application discloses an auxiliary instrument for aortic replacement artificial blood vessel surgery, which comprises a collapsible and inflatable bag body which extends into the aorta of a heart to block blood, wherein the bag body is provided with a bag body channel for blood to pass through, and the upper end of the bag body is connected with a drainage tube; the connection end of the drainage tube with the bag body is provided with a drainage tube cavity; the outer side of the drainage tube is provided with a drainage tube through hole for guiding the seepage blood between the bag body and the aorta of the heart into the drainage tube cavity; the drainage tube is respectively provided with a drainage tube channel which is communicated with the bag body channel and is used for sending the blood in the aorta of the heart into an extracorporeal circulation device, an injection channel which is used for injecting or extracting liquid or gas to the bag body so as to make the bag body inflate or shrink, and a seepage blood extraction channel which is used for extracting the seepage blood in the drainage tube cavity; the seepage blood is guided into the drainage tube cavity through the drainage tube through hole, and the seepage blood is extracted through the seepage blood extraction channel, so that the problem of the seepage blood blocking the suture visual field is solved.

The application discloses an anti-bending artificial blood vessel, which comprises an artificial blood vessel inner layer, a synthetic polymer anti-bending ring and an artificial blood vessel outer layer; the artificial blood vessel inner layer is a synthetic polymer tube body; the artificial blood vessel outer layer is a synthetic polymer fiber membrane; the shape of the synthetic polymer anti-bending ring is a non-equidistant spiral structure; the synthetic polymer anti-bending ring is wound on the outer wall of the artificial blood vessel inner layer, is between the artificial blood vessel inner layer and the artificial blood vessel outer layer, and is fixed by being covered by the artificial blood vessel inner layer and the artificial blood vessel outer layer. The application further discloses a preparation method of the artificial blood vessel. The application can make the artificial blood vessel to be bent by 180 degrees in a full ring without flat collapse and kinking, can ensure that the whole artificial blood vessel has good anti-bending performance, can effectively improve the anti-bending performance of the artificial blood vessel, and can effectively improve the compliance of the artificial blood vessel.

The application discloses a medical instrument technical field, and relates to an integrated type artificial blood vessel with a sinus, which comprises a tube part, a sinus-tube joint and a sinus part which are integrally woven and shaped, and the tube part and the sinus part have a same longitudinal axis, the sinus part has a dense structure which is composed of upper and lower layer fabric tissues which are connected with each other, and the connecting points are located at the overlapping positions of the upper and lower layer tissue points, the fabric coverage of the dense structure is 80%-95%, the upper and lower layer fabric tissues are both woven by a plurality of fabric tissues with a yarn density of not less than 80 root / cm, and the upper and lower layer fabric tissues both contain twill tissues. The application provides an integrated type artificial blood vessel with a sinus, which has a good sinus part form, a dense structure and good stability, the sinus part has a dense tissue structure, so that the elastic performance is ensured, the structure support is strong, the long-term radial overexpansion can be prevented, the service life of the artificial blood vessel and the autologous valve is prolonged, and the possibility of postoperative secondary intervention is reduced.

The objective is to provide a vascular access device that can reduce the risk of damage to artificial blood vessels during puncture. [Solution] The vascular access device 9 includes an artificial blood vessel 91 and an access port 92 that protrudes radially from the artificial blood vessel 91. The artificial blood vessel 91 includes a curved portion 911a adjacent to the access port 92 that curves convexly toward the access port 92. It is preferable that the access port 92 contains an elastomer.

The invention discloses a blood vessel end side anastomat based on a lining. A containing cavity is reserved between an inner cylinder and an outer cylinder; the outer wall of the end of the outer barrel is fixedly connected with the nail pushing device, the inner wall of the end of the inner barrel is fixedly connected with a limiting disc, the outer wall of the limiting disc extends out of a limiting rod to be in limiting connection with the nail pushing device, and the end of the inner barrel is adjustably connected with the nail abutting device. The problem that in the prior art, in the suture process between an artificial blood vessel and an artery blood vessel, no special medical instrument can meet the use requirement is solved. The blood vessel end side anastomat based on the lining is reasonable in structural design and can extend into an artificial blood vessel, a suture structure is directly formed between the artificial blood vessel and an artery blood vessel, and suture between the artificial blood vessel and the artery blood vessel is achieved at a time. The suturing efficiency is improved, the suturing effect of the suturing position is guaranteed, the anesthesia time of a patient is shortened, and then damage to the patient is reduced.

The invention discloses a blood vessel end side anastomat based on an outer lining, which comprises a fixed cylinder, the end part of the fixed cylinder is connected with a nail propping device and a nail pushing device, the nail propping device and the nail pushing device are both of a circular structure, and the nail propping device and the nail pushing device are concentrically arranged. The problem that in the prior art, in the suture process between the end of an artificial blood vessel and the end of a vein, no special medical instrument can meet the use requirement, and the suture can only be conducted in a manual suture mode is solved. According to the blood vessel end side anastomat based on the outer lining, in the suture process of an artificial blood vessel and a vein vessel, the one-time suture effect on the artificial blood vessel and the vein vessel of an annular structure can be guaranteed through the effects of supporting a nail abutting device or a nail pushing device of the anastomat and suturing the other side or abutting nails by means of the eversion structure of the artificial blood vessel. Through the opening and closing structure of the nail abutting device and the nail pushing device, the nail abutting device and the nail pushing device can be conveniently detached from the blood vessel, the operation time is saved, and damage to a patient is reduced.

This invention relates to a sutureless vascular system, comprising a sutureless blood vessel, an artificial blood vessel, a locking ring, and a fixing ring. The artificial blood vessel is connected to either the locking ring or the fixing ring. The fixing ring and the locking ring are respectively positioned on the inner or outer side of the target blood vessel. The diameter of the locking ring can be increased or decreased to clamp the target blood vessel between the locking ring and the fixing ring. The sutureless vascular system of this invention has a simple overall structure. The operator only needs to align the target blood vessel with the fixing ring or the locking ring, and then tighten or expand the locking ring to complete the connection between the artificial blood vessel and the target blood vessel. The sutureless vascular system has high reliability, good sealing, and no blood leakage. It avoids the vascular torsion caused by the tightening process of the original ligature, which affects hemodynamics. At the same time, the overall operation is simple, the efficiency is significantly increased, and the operation time is effectively shortened.

The application belongs to the field of cardiovascular interventional medical instruments, and discloses a self-healing and puncture type artificial blood vessel and application. The self-healing and puncture type artificial blood vessel, wherein the intermediate layer is a self-healing polyurethane elastomer (SHPU), endows the artificial blood vessel with excellent mechanical strength, toughness and puncture resistance; the inner layer is an anticoagulant hydrogel layer (SBMA-IL), and the outer layer is an antibacterial hydrogel layer (SBMA@PVP-OL); the inner layer and the outer layer are covalently bonded to the inner and outer surfaces of the SHPU pipeline by using surface permeation-grafting crosslinking technology. The puncture type artificial blood vessel disclosed by the application has the performances of rapid self-healing, long-acting anticoagulation and high-efficiency antibiosis, and can effectively solve the problems of bleeding, thrombosis and infection existing in the current vascular access when used as a hemodialysis vascular access.

The utility model relates to the technical field of medical equipment, in particular to a special artificial blood vessel for a dialysis patient, which comprises an artery branch tube, a vein branch tube and a puncture needle, the artery branch tube and the vein branch tube are arranged in an X-shaped structure, the artery branch tube and the vein branch tube comprise an inlet tube, a thin branch tube and an outlet tube, and the tube diameter of the thin branch tube is smaller than that of the inlet tube and that of the outlet tube. A penetrating membrane is arranged between the artery branch tube and the vein branch tube, and the outer portion of the penetrating membrane is matched with the adjacent thin branch tube. The artery branch tube and the vein branch tube of the X-shaped structure do not interfere with each other, blind ends of blood vessels are avoided, a puncture needle penetrates through a penetrating membrane through the vein branch tube and then enters the artery branch tube under DSA equipment during dialysis, and due to the fact that the tube diameter of a thin branch tube is smaller than that of an inlet tube and that of an outlet tube, the blood flow speed is increased; arterial blood in the inlet pipe in the arterial branch pipe flows into the venous branch pipe from the side hole to form arterial and venous blood to be pumped into a dialysis machine, so that normal circulation of blood in a blood vessel is ensured, and the phenomena of blood clots, thrombus and the like are prevented.

The present article relates to an artificial graft (artificial blood vessel) used in surgical procedures such as bypass surgery (such as implantation of an artificial blood vessel).

The blood vessel broken end connecting device is provided with a multi-layer tubular structure, and the multi-layer tubular structure comprises an inner-layer artificial blood vessel section, a middle artificial blood vessel section and an outer-layer artificial blood vessel section which are coaxial and sequentially arranged from inside to outside. The far end of the middle artificial blood vessel section is connected with the far end of the outer-layer artificial blood vessel section and the part, close to the far end of the inner-layer artificial blood vessel section, of the inner-layer artificial blood vessel section, the near end of each tube section in the multi-layer tubular structure is a free end, and the near end part, close to the inner-layer artificial blood vessel section, of the inner-layer artificial blood vessel section forms the near end part of the inner-layer artificial blood vessel section; the inner support ring is arranged on the peripheral side of the near end part of the inner-layer artificial blood vessel section, and in a natural expansion state, the length of the middle artificial blood vessel section is smaller than that of the inner-layer artificial blood vessel section and smaller than that of the outer-layer artificial blood vessel section. According to the blood vessel broken end connecting device provided by the embodiment of the invention, the suture time and the suture difficulty in the aorta root reconstruction process can be well shortened, and meanwhile, the problem of blood leakage at the ascending aorta root reconstruction position is avoided.

This invention relates to a sutureless vascular system, comprising a sutureless blood vessel, an artificial blood vessel, a locking ring, and a fixing ring. The artificial blood vessel is connected to either the locking ring or the fixing ring. The fixing ring and the locking ring are respectively positioned on the inner or outer side of the target blood vessel. The diameter of the locking ring can be increased or decreased to clamp the target blood vessel between the locking ring and the fixing ring. The sutureless vascular system of this invention has a simple overall structure. The operator only needs to align the target blood vessel with the fixing ring or the locking ring, and then tighten or expand the locking ring to complete the connection between the artificial blood vessel and the target blood vessel. The sutureless vascular system has high reliability, good sealing, and no blood leakage. It avoids the vascular torsion caused by the tightening process of the original ligature, which affects hemodynamics. At the same time, the overall operation is simple, the efficiency is significantly increased, and the operation time is effectively shortened.

The invention relates to an anticoagulant nanocellulose tube and preparation and artificial blood vessel application thereof, a sulfating agent reacts with a pretreated nanocellulose tube, and after the reaction is terminated, the anticoagulant nanocellulose tube with two heterogeneous surfaces is obtained. The preparation process is simple, easy to operate and short in reaction time, and has a wide application prospect in blood contact medical substitutes such as linings of small-caliber arteriovenous and hemodialysis fistulization tubes and medical instruments. In addition, the material also has huge potential when being used as a surfactant, a humectant and an antiviral material.

The present invention relates to a medical device, specifically to a subcutaneous tunneler assembly for artificial vascular arteriovenous fistulas, which includes a dilator, a guidewire, and a sleeve. The dilators are two open-ended, tubular structures, each with a bendable segment. The sleeve has a sleeve cavity that fits the artificial vascular graft. The guidewire is placed in the communicating cavity formed by the abutment of the two dilators. The bendable segments bend the two dilators to fit a predetermined path of the subcutaneous tunnel. After the dilators are introduced subcutaneously through a skin incision, the ends are abutted to form a continuously curved U-shaped subcutaneous tunnel, reducing the size of the skin incision, minimizing surgical trauma, and preventing infection. The sleeve protects the artificial vascular graft from contact with the skin, reducing the risk of infection during surgery. After the artificial vascular graft is inserted into the sleeve, there is no need to adjust its position, preventing twisting, bending, or bending of the artificial vascular graft during insertion.

The invention relates to a device designed to ensure the continuity of blood flow by enabling the connection of the aorta and an artificial graft using a clamp mechanism, in cases where an aneurysm (vessel dilation) and / or dissection (tearing of the layers forming the vessel wall) develops in any section of the aorta, and where the damaged aortic tissue is to be replaced with an artificial vessel.

The present invention relates to the field of medical device technology, and in particular to a suture-free blood vessel device, a suture-free artificial blood vessel, and a delivery system. The suture-free blood vessel device comprises a hoop and a skirt, one end of the skirt is fixedly mounted on the hoop, and a side edge of the skirt is provided with an incision for cutting the skirt along its axial direction, and a binding wire is provided at the incision for pulling the incision together and tightening it. The beneficial effect of the present invention is as follows: during surgery, a vascular blocking forceps is used to clamp the hoop, and the hoop and the skirt are inserted along the stump of the descending aorta and then sleeved on the outside of the descending aorta. Then, a stent graft is implanted into the inner wall of the descending aorta, and the binding wire is tightened. The stent graft and the skirt clamp the inside and outside of the descending aorta to achieve a suture-free effect, so that the descending aorta, the stent graft, and the artificial blood vessel can be quickly and tightly connected together, thereby greatly shortening the deep hypothermic circulatory arrest time during surgery and reducing surgical complications.

The purpose of the present disclosure is to provide a vascular access device capable of reducing the risk of damage to an artificial blood vessel during puncture. This vascular access device (9) includes an artificial blood vessel (91) and an access port (92) protruding from the artificial blood vessel (91) in a radial direction of the artificial blood vessel (91). The artificial blood vessel (91) includes, next to the access port (92), a curved part (911a) curved in a convex shape toward the access port (92). The access port (92) preferably contains an elastomer.

The present article relates to an artificial graft (artificial blood vessel) used in surgical procedures such as bypass surgery (such as implantation of an artificial blood vessel).

The present invention relates to the technical field of medical devices, and specifically provides a vascular anastomosis device, which includes an operating handle, a vascular suture and dilatation assembly, a fixing assembly, and a quick-release assembly. In the present invention, the movable insertion rod is inserted into the blood vessel insertion tube, so that the side support members expand the first and second rubber outer sheaths, respectively expanding the suture ends of the artificial blood vessel and the native blood vessel. The suture ends are in contact and have the same suture port diameter, which facilitates blood vessel suture, simplifies the suture process, improves the efficiency of blood vessel suture, and shortens the operation time. The present invention uses a torsion spring and a clamping block for fixation to enhance the stability of the side support members, firmly support the artificial blood vessel and the native blood vessel, facilitate the suture operation, and solve the problem that the unstable fixation of the blood vessel affects the suture. The blood vessel insertion tube of the present invention can be inserted and disassembled with the operating handle, which is convenient for disassembly and cleaning.

A connector assembly for an arteriovenous (AV) graft according to an example of the present disclosure includes, among other possible things, a connector having a first segment arranged a long a first axis having first and second opposing ports and a second segment arranged along a second axis having a third port, each of the first and second ports configured to be joined to first and second portions of an artery or a vein, respectively. At least one ring is configured to connect the first and second ports to the first and second portions of the artery or the vein by applying force about substantially the circumferential extent of the first segment of the connector and the first and second portions of the artery or the vein to join the first and second ports to the first and second portions of the artery or the vein, respectively. An AV graft assembly and method of implanting a connector for an AV graft are also disclosed.

In various designs, a device for the treatment of vascular disease includes a stent graft (100) with an external surface and at least two side-branching portals (110), each with a proximal and a distal end. Each distal end is virtually contiguous to the external surface of the stent graft. In other designs, the distal ends are usually more axially separated than the proximal ends.

The application provides a vascularized skin flap and a preparation method thereof, and belongs to the field of tissue engineering materials. The preparation method comprises the following steps: providing muscle tissue and an artificial blood vessel. The muscle tissue is subjected to cooling treatment, and the cooled muscle tissue is subjected to hole opening treatment to obtain a first structure. The artificial blood vessel is subjected to shrinkage treatment, and the shrunk artificial blood vessel is implanted into the hole of the first structure to obtain a second structure. The artificial blood vessel in the second structure is subjected to expansion treatment to obtain a third structure. The third structure is subjected to decellularization treatment to obtain the vascularized skin flap. The outer diameter of the artificial blood vessel is greater than the inner diameter of the hole. The technical scheme can improve the connection stability of the artificial blood vessel and the muscle tissue, further promote the growth of new blood vessels and the vascularization process of the vascularized skin flap, improve the survival rate of skin flap transplantation, and thus improve the vascularization effect of the vascularized skin flap.

The invention provides a vascularized skin flap and a preparation method thereof, and belongs to the field of tissue engineering materials, and the preparation method of the vascularized skin flap comprises the step of providing muscular tissue and artificial blood vessels. The muscular tissue is cooled, the cooled muscular tissue is subjected to trepanning treatment, and the first structure is obtained. And performing contraction treatment on the artificial blood vessel, and implanting the contracted artificial blood vessel into the opening of the first structure to obtain a second structure. And performing expansion treatment on the artificial blood vessel in the second structure to obtain a third structure. And performing decellularization treatment on the third structure to obtain the vascularized skin flap. Wherein the outer diameter of the artificial blood vessel is larger than the inner diameter of the opening. According to the technical scheme, the connection stability of the artificial blood vessel and muscular tissue can be improved, the ingrowth of new blood vessels and the vascularization process of vascularized flaps can be further promoted, the survival rate of flap transplantation is increased, and therefore the vascularization effect of the vascularized flaps is improved.

The invention relates to a percutaneous artery and vein split type artificial blood vessel system for hemodialysis and a using method of the percutaneous artery and vein split type artificial blood vessel system. The percutaneous artery and vein split type artificial blood vessel system comprises two infusion devices completely implanted subcutaneously and two sections of independent blood vessel substitutes. The diaphragm of the infusion device is made of a high-elasticity biocompatible material, and a microstructure and an antibacterial coating are designed on the surface of the diaphragm, so that the sealing performance and the anti-infection performance are ensured; the blood vessel substitute reduces turbulence and thrombus risks through inner diameter matching, conical transition section optimization and antibacterial treatment. The system reliability is further improved through key connection point stability testing and implantation position optimization. According to the application, the stability and safety of a hemodialysis channel are remarkably improved, and the infection and complication risk is reduced.

The invention relates to a device designed to ensure the continuity of blood flow by enabling the connection of the aorta and an artificial graft using a clamp mechanism, in cases where an aneurysm (vessel dilation) and / or dissection (tearing of the layers forming the vessel wall) develops in any section of the aorta, and where the damaged aortic tissue is to be replaced with an artificial vessel.

The invention belongs to the field of cardiovascular implantation intervention medical apparatuses and instruments, and discloses a self-healing ready-to-wear artificial blood vessel and an application of the self-healing ready-to-wear artificial blood vessel. According to the self-healing ready-to-wear artificial blood vessel, the middle layer is the self-healing polyurethane elastomer (SHPU), so that the artificial blood vessel is endowed with excellent mechanical strength, toughness and puncture resistance; the inner layer is an anticoagulant hydrogel layer (SBMA-IL), and the outer layer is an antibacterial hydrogel layer (SBMA-coated PVP-OL); the inner layer and the outer layer are formed by covalently bonding the inner surface and the outer surface of the SHPU pipeline by adopting a surface permeation-grafting crosslinking technology. The ready-to-wear artificial blood vessel has rapid self-healing, long-acting anticoagulation and efficient antibacterial properties, is applied as a blood vessel access for hemodialysis, and is expected to effectively solve the problems of errhysis, thrombus and infection existing in the existing blood vessel access.

A vascular constricting device for constricting vascular lumens to regulate blood flow in a vascular system includes a cuff having an inflatable body and a frame adapted for wrapping round a vascular lumen, such as a native blood vessel or non-native graft, and a pump having an internal reservoir for doling a fluid and a fluid circuit for controlling the flow of fluid between the reservoir and the inflatable body for selectively inflating and deflating the inflatable body. In a hemodialysis treatment, the vascular constricting device is actuated to inflate the inflatable body to restrict blood flow and lower blood flow rate during off-treatment periods, and is actuated to deflate the inflatable body to permit an unrestricted blood flow and a higher blood flow rate during on-treatment periods.

The application discloses an anti-folding artificial blood vessel lining support which is installed at a bifurcation of a main blood vessel and a branch blood vessel and comprises an anti-folding part, a positioning part arranged at one end of the anti-folding part and an anchoring part arranged at the other end of the anti-folding part, wherein the positioning part is positioned in cooperation with the main blood vessel of the artificial blood vessel, the anti-folding part extends into the branch blood vessel of the artificial blood vessel, and the anchoring part is matched with the inner wall of the branch blood vessel. The application effectively provides sufficient support for the connecting part of the artificial blood vessel and the branch blood vessel, and avoids the folding problem.

The present invention relates to a novel bio-ink for preparing bioartificial vascular grafts which are highly useful for vascular and cardiovascular research and therapy, and in particular for surgical vascular and cardiovascular repair and bypass surgery. The bio-ink composition of the invention comprises a peptide-grafted alginate and smooth muscle cells, endothelial cells or cells which are capable of developing into endothelial cells. According to the invention, the peptides grafted onto the alginate are derived from an extracellular matrix protein or mimic such proteins. The invention also relates to a method for manufacturing a bioartificial vascular graft comprising the printing of the bio-ink composition of the invention. Bioartificial vascular grafts, which are obtainable by the method of the invention, are also encompassed by the invention. In yet another aspect, the invention relates to the use of the bio-ink for in vitro drug screening and as an in-vitro training model for endovascular or surgical training.

The application relates to a bleeding-preventing structure and a blood pump system, the bleeding-preventing structure comprising a positioning tube and a bleeding-preventing baffle; wherein the positioning tube is provided with an inlet end, a fixed end and a pumping channel; the pumping channel extends through the fixed end from the inlet end to be passed through by a blood pump; the bleeding-preventing baffle is arranged on the pumping channel to block fluid from passing through the pumping channel; the bleeding-preventing baffle is connected and fixed with the positioning tube, and the bleeding-preventing baffle is provided with a pump hole; the pump hole is communicated with the pumping channel to be penetrated by a catheter of the blood pump; and the bleeding-preventing baffle can be in interference fit with the catheter of the blood pump. The bleeding-preventing structure can replace a traditional artificial blood vessel to be connected to a blood vessel incision, so that the blood pump can pass through and extend into the blood vessel, and the blood leakage can be reduced, the blood loss of a patient can be effectively prevented, and the operation risk can be reduced.