78 results about "Native tissue" patented technology

The invention provides a preparation method of a cell culture three-dimensional scaffold and cell culture meat, which comprises the following steps: firstly, preparing a gelatin-carrageenan mixed solution and a gel precursor solution of transglutaminase, dividing into two parts, incubating at constant temperature to obtain two parts of composite hydrogel, randomly freeze-drying one part to obtain aerogel, and freeze-drying the aerogel to obtain the cell culture three-dimensional scaffold. Stacking on the other part and incubating at constant temperature again to obtain the prefabricated double-layer gel. The prefabricated double-layer gel is directionally frozen, ice crystals grow upwards from the bottom, freezing is stopped after the temperature is reduced to the set temperature, and the cell culture three-dimensional scaffold is obtained through drying. The stent adopts an ordered-disordered partition design, parallel micro-channels are formed in the lower layer by using a directional ice template method, and muscle fiber arrangement is simulated; a porous spongy structure is constructed on the upper layer by using a random ice template method, and is adapted to adipocyte proliferation. Two layers of interfaces are interpenetrated and communicated, natural mechanical gradients are combined, natural tissue characteristics are re-engraved, the traditional limitation is broken through, the cell co-culture efficiency and the cultured meat quality are improved, and industrialization is promoted.

The utility model provides a valve stent and an artificial heart valve prosthesis, the artificial heart valve comprises the valve stent, the valve stent is provided with an inflow end and an outflow end which are opposite to each other, and the valve stent comprises a main stent and a plurality of clamping mechanisms which are arranged at intervals along the circumferential direction of the main stent and are connected with the outer circumferential surface of the main stent; the clamping mechanism comprises a first clamping body and a second clamping body which are arranged in the direction from the inflow end to the outflow end. The first clamping body and the second clamping body are used for clamping the native valve leaflet so that the heart valve prosthesis can be anchored in the heart, the anchoring of the heart valve prosthesis can be achieved without extruding the valve ring in the radial direction through the main support, and the situation that native tissue such as the valve ring is damaged due to radial extrusion is avoided.

Provided herein are methods for producing a cultured tissue that mimics a natural tissue or organ. In some embodiments, the methods comprise culturing cells in a three-dimensional (3D) pattern on a scaffold, and applying an exogenous force to the cells while the cells are cultured. The applied exogenous force induces the cultured cells to form a cultured tissue that mimics the 3D cellular pattern and biomechanics of the natural tissue or organ. Also provided herein are bioreactors for producing a cultured tissue that mimics a natural tissue or organ. In certain embodiments, the bioreactors comprise: a scaffold for culturing cells in 3D pattern, and an exogenous force applicator to exert an exogenous force to the cells cultured in the 3D pattern. Additional embodiments provide cultured tissues that mimic natural tissues or organs as produced according to the methods disclosed herein.

Provided is a use of a biological material in preparing a product for limiting gastric volume. The biological material is selected from a decellularized matrix, an artificial extracellular matrix and a high molecule compound. The wrapping of a remaining stomach after gastric volume reduction surgery by the biological material can effectively reduce the expansion of the gastric volume after the surgery for a long time. The gastric volume of the remaining stomach can be effectively maintained, avoiding the occurrence of weight regain caused by the expansion of the remaining stomach. The decellularized matrix and a biological material remolded tissue have the viscoelasticity equivalent to or close to natural tissue, avoiding gastric wall stiffness, and thus not affecting gastric wall peristalsis.

The present invention relates to a valve stent and a prosthetic valve. The prosthetic valve comprises a skirt, a prosthetic valve leaflet, and the valve stent; the prosthetic valve leaflet is arranged on the inner side of the valve stent and connected to the skirt and the valve stent; the skirt comprises an inner skirt and an outer skirt; the valve stent comprises a flange part and a main body part; the flange part is connected to an inflow end of the main body part, and the flange part comprises an inner layer structure and an outer layer structure arranged from inside to outside; an annular curved surface defined by the inner layer structure does not overlap an annular curved surface defined by the outer layer structure, so that the flange part forms a three-dimensional structure in which the inner layer and the outer layer are distributed in a staggered manner; the outer skirt is connected to the inner skirt along the outer layer structure to form at least one pocket; the pocket defines a pocket opening; and the pocket opening is located on the outer side of the valve stent and arranged towards an outflow end of the main body part. Therefore, when the heart contracts, the pocket expands to fill a gap between the flange part and the native tissue, so that the liquid is prevented from flowing back around the prosthetic valve, better preventing perivalvular leakage.

The invention discloses a valve stent, a valve prosthesis and application of the valve stent and the valve prosthesis to preparation of medical instruments. The valve stent comprises an inner-layer stent body and an outer-layer stent body, the outer-layer stent body is of a hollow net-shaped structure with the two ends open and comprises an outer stent body and a woven structural part, the outer stent body comprises a main supporting part and a secondary supporting part which are sequentially connected in the axial direction, and the secondary supporting part is provided with a self-adaptive area; the woven structural part is fixed on the secondary supporting part and covers the self-adaptive area; the supporting strength of the woven structural part is smaller than that of the outer frame body. The inner-layer frame body is of a cylindrical structure with two open ends; the outer-layer frame body is arranged outside the inner-layer frame body in a sleeving manner and is fixedly connected with the inner-layer frame body. The valve support is stable in structure, and on the premise that a good radial supporting effect is kept, damage to native tissue of a patient is small.

The invention relates to the technical field of biological scaffolds, in particular to a silk fibroin-based biological 3D intelligent response scaffold and a preparation method and application thereof.The silk fibroin-based biological 3D intelligent response scaffold adopts a three-layer bionic gradient structure of an oriented fiber membrane, a porous sponge layer and an interface layer, simulates natural tissues, and has the advantages that the bionic gradient structure is improved; mechanical guidance, cell inhabitation and biological activity interfaces are provided respectively, and high-quality regeneration of blood vessels, nerves and skin is promoted synergistically. According to the present invention, the pH / enzyme / temperature triple response unit is provided, such that the lesion microenvironment can be perceived, the targeted release can be triggered, the problem of high burst release rate of the traditional physical drug loading can be solved, and the on-demand accurate drug delivery can be achieved. The SF / HPMC gel is adopted for 3D printing, the printing precision is high, and the porosity difference is 1t; the product performance is stable, and the pore structure can be precisely designed and customized according to the regeneration requirements of different tissues (such as blood vessels, nerves and skin).

A valve device comprises a valve body with a framework and a valve portion coupled to the framework that is movable between open and closed positions. The framework comprises a plurality of wire portions. The valve portion may be formed of a material that promotes in-growth of native tissue so that the valve portion cooperates with native valve leaflets. The valve device also comprises one or more anchors and anchor tethers that secure the valve device in a heart. In some examples, the method includes folding and loading the valve body into a valve cartridge, delivering the valve body through a guide tube to a position the valve body at a target positioned within the heart, pushing the valve body out of the guide tube, and secure the anchors and anchor tethers in the heart, and cutting the anchor tethers to remove excess portions.

The LNTPI is a surgical instrument used to cut through fibrotic and edematous tissue to define the natural tissue plane of dissection. After defining the natural tissue plane, it is designed to move or carefully insinuate tissues along these natural planes without cutting the tissue, so that targeted organs or parts thereof could be viewed and reached during laparoscopic procedures. The following features make the LNTPI unique compared to standard blunt dissectors used in laparoscopy: 1. The tip of the LNTPI is coarse and not smooth. The tip has diagonal, spiral ridges from the sides which are carried onto the tip converging as a single spiral at the center of the tip, creating a pattern resembling that of a screw; 2. The ridges of the LNTPI are comprised of asymmetrical triangular ridges with an acute angle at the apex that may be leaning along with or against the rotation of the spiral; 3. The tip of the LNTPI is made of tungsten carbide metal instead of stainless steel; 4. Dissection can be done in the usual up, down, left, and right motions as standard dissectors; 5. The side of the LNTPI can be used to "peel" tissue by using the ridges on its side combined with a twisting movement. This maneuver cannot be performed using standard dissectors; and 6. The tip of the LNTPI can perform circumferential dissection when used with a twisting movement causing it to engage tissue like a "drill" along the natural tissue plane. The ridges that converge into a single spiral at the tip of the invention appear like a screw and with the proper twisting movement have a similar effect on tissue. Because of the texture, design, and material used for the tip of the LNTPI, it has the following advantages over standard dissectors: The LNTPI can engage tissues more easily even if the tissues are slippery due to the presence of blood or fluids. The LNTPI can be used to engage tissues through a twisting motion which motion allows the tissues to be engaged in a specific manner that defines natural tissue dissection planes. The LNTPI can insinuate / "peel" tissue by using the side spiral ridges in combination with a twisting movement. The LNTPI can perform circumferential dissection by using the tip and the convergence of the spiral ridges at the center of the tip in combination with a twisting movement. The transfer of lateral shear force to the tissue at various angles (45, 90, and 180 degrees) when using the LNTPI is significantly higher whether the motion is by a sweeping motion or twisting of the instrument, allowing it to insinuate better than standard instruments, especially in a wet field. Hand movements needed in insinuating tissue using the LNTPI are different from the usual hand movements when using standard dissection instruments. The hand movements in using LNTPI require less muscular effort and repetitiveness, thus preventing muscle fatigue and repetitive use injury among surgeons. The instrument is reusable, as compared to dissectors that have fabric at the tip, which must be disposed of and replaced once the fabric tip fully absorbs the blood or other fluid in the wet tissue surface.

Bone plates are disclosed for veterinary uses. For example, the bone plates could be utilized for repairing medial patellar luxation in animals, such as canines, felines, or equines, for example. The bone plates may include various features for better accommodating the anatomy and native tissue structure of the proximal tibia of the animal.

Particulated and reconstituted tissues comprising small, densely packed tissue microparticles encapsulated in a tissue specific promoting gel packed at a percolation threshold that can be transplanted into damaged tissue thereby facilitating regeneration following trauma to the tissue. The engineered microparticle construct for tissue replacement and repair, as taught herein, provides numerous benefits including (1) encouraging a regenerative response in damaged tissue regions, (2) mimicking the structural support of native tissue, (3) establishing an environment that promotes attachment, migration, and differentiation of infiltrating stem cells, and (4) providing a source of growth factors and other anti-catabolic growth factors and cytokines. Tissue specific microparticles packed together at, or past, their percolation threshold will provide the necessary mechanical environment and to best recapitulate and integrate with native tissue. The packing of microparticles, derived from the ECM of native tissue to a concentration past the percolation point will yield both the necessary biochemical and biomechanical properties necessary for reconstituting a specific tissue.

The present technology is directed to adjustable interatrial shunting systems that selectively control blood flow between the left atrium and the right atrium of a patient. The adjustable interatrial devices include a shunting element having an outer surface configured to engage native tissue and an inner surface defining a lumen that enables blood to flow from the left atrium to the right atrium when the system is deployed across the septal wall. The systems can include an actuation assembly for selectively adjusting a geometry of the lumen and / or a geometry of a lumen orifice to control the flow of blood through the lumen.

Bone plates are disclosed for veterinary uses, for instance for performing distal femur repairs in canines or felines. The bone plates includes various features for better accommodating the anatomy and native tissue structure of the distal femur of an animal and may be utilized for all distal femur fracture patterns. Amongst the features, the head portion of the bone plate is positioned at an angle relative to its shaft portion and includes a curvature configured to match said distal femur; furthermore, head and shaft portions include openings extending along different trajectories.

Devices, systems, and methods for preventing leakage through a therapeutic implant are provided. An exemplary apparatus includes an elongate wire configured to be implanted within a heart of a patient such that the elongate wire is positioned within a non-circular gap between a therapeutic implant positioned within the heart and a native heart tissue of the patient to stop a leakage of blood through the non-circular gap. The elongate wire comprises a single length of material set in a serpentine shape. Moreover, the elongate wire is configured to retain the serpentine shape when the elongate wire is positioned within the non-circular gap.

The invention relates to an alveolar bone-periodontal membrane imitating dual-phase scaffold and a preparation method and application thereof, and relates to the technical field of tissue engineering scaffold materials, the alveolar bone-periodontal membrane imitating dual-phase scaffold comprises a fiber phase module and a bone phase module constructed on the fiber phase module; the fiber phase module is an ordered arrangement fiber network scaffold constructed by dopamine modified gelatin; the bone phase module is a gelatin 3D printing bracket doped with freeze-dried platelet-rich fibrin percolate and nano clay. The artificial alveolar bone-periodontal membrane biphase stent provided by the invention comprises a bone phase module of a PRFe-loaded 3D printing stent and a fiber phase module of oriented electrostatic spinning, and each module is highly matched with biomechanical characteristics of periodontal soft and hard tissues, so that synchronous repair of the periodontal soft and hard tissues can be realized; the technical problems that a gap exists between tissue engineering scaffold interface bionics and natural tissues and the endogenous regeneration efficiency is poor are effectively solved.

The invention generally relates to mass spectral analysis. In certain embodiments, methods of the invention involve analyzing a lipid containing sample using a mass spectrometry technique, in which the technique utilizes a liquid phase that does not destroy native tissue morphology during analysis.

A medical implant is provided defined as an electrospun hollow-cored porous suture ring. The suture ring is a continuous ring made by rolling up circular sheet of electrospun material, which was electrospun over a cylindrical target. The suture ring, upon implantation, is capable of being absorbed and replaced by natural tissue due to ingrowth of cells and nutrients into pores of the electrospun hollow-cored biodegradable suture ring. The suture ring addresses at least some of the existing problems with suture or sewing rings.

Disclosed herein is a system comprising acoustically assembled patient-derived cell clusters that can preserve original tissue compositions, including tumor and immune cell compositions for solid tumors collected from a patient, and model their interactions in 3D microenvironments. Such a system allows for ex vivo manipulations of the system to investigate and predict how the native tissues will responses to treatments, including those of a primary and metastatic patient tumor, in a rapid, scalable, and user-friendly manner.

The invention discloses a preparation method of a nanofiber yarn 3D printing composite scaffold, and the preparation method comprises the following steps: S1, dissolving a polymer and / or an inorganic source required by spinning in a corresponding solvent to obtain a spinning precursor solution; s2, spinning by using the spinning precursor solution in the step S1 through nanofiber spinning equipment to obtain nanofiber yarns; s3, printing by utilizing a 3D printing technology to obtain a polymer framework; and S4, weaving the nanofiber yarns in the step S2 in the polymer framework in the step S3 to obtain the nanofiber yarn 3D printing composite scaffold. The scaffold prepared by the preparation method not only has a 3D printed geometric structure, but also has high specific surface area and biological activity of nanofibers, can better simulate the microenvironment of natural tissues, can overcome the limitation of a traditional scaffold, and provides a more ideal tissue engineering scaffold.

The present technology is directed to adjustable interatrial shunting systems that selectively control blood flow between the left atrium and the right atrium of a patient. The adjustable interatrial devices include a shunting element having an outer surface configured to engage native tissue and an inner surface defining a lumen that enables blood to flow from the left atrium to the right atrium when the system is deployed across the septal wall. The systems can include an actuation assembly for selectively adjusting a geometry of the lumen and / or a geometry of a lumen orifice to control the flow of blood through the lumen.

Bone plates are disclosed for veterinary uses. For example, the bone plates could be utilized for repairing proximal femur fractures in canines or felines. The bone plates may include various features for better accommodating the anatomy and native tissue structure of the proximal femur of an animal and may be utilized for all proximal femur fracture patterns.

The invention discloses a penis prosthesis cylinder based on a function separation and photocuring technology and an individualized shaping method thereof. The core lies in that a'function separation 'design normal form is adopted, an external individualized shaping sleeve and internal fluid pressure are utilized to realize intraoperative temporary shaping, and thiol-ene and other efficient photocuring materials are subjected to irreversible cross-linking reaction under illumination to realize permanent locking of forms. The cylinder prepared by the method has an individualized shape which is highly matched with a cavernous body cavity of a patient, and has softness (hardness of 25A-30A) close to that of natural tissues and excellent anti-fatigue performance (gt; and 500,000 times of circulation). More importantly, the conversion rate of the selected material system is high (gt; and after curing, the product does not need to be subjected to complicated post-treatment, and can be implanted only by flushing with normal saline. The cylinder can be integrated with a general pump valve and a liquid storage bag through a standard connector to form a complete three-piece prosthesis system, the postoperative displacement rate can be remarkably reduced, the stick feeling is eliminated, and the three-piece prosthesis has great clinical value and wide industrialization prospects.

The invention discloses an artificially implanted heart valve which has an axial direction, an inflow side and an outflow side in space, the artificially implanted heart valve comprises an inner frame, the inner frame is of a barrel-shaped structure which can deform in the radial direction, the inner frame is of a grid structure, and each grid is defined by frame strips; a valve leaflet; the outer frame is of an integrated annular structure and comprises a plurality of arm parts in the circumferential direction, the outflow side of each arm part is fixedly connected to the inner frame, the inflow side of each arm part is located on the periphery of the inner frame, and a first gap capable of clamping native tissue is formed between the inflow side of each arm part and the inner frame; the outflow sides of every two adjacent arm parts are close to each other to form an intersection part, each intersection part is provided with a forked structure extending towards the corresponding outflow side, and the forked structures extend along the frame strips of the inner frame. The intersection part of the artificially implanted heart valve extends to the inner side of the inner frame and is attached to the inner side of the inner frame, so that the artificially implanted heart valve is convenient to load and adjust the posture in the body in the releasing process, and operation is more convenient.

The invention discloses a tomato seedling raising method capable of resisting root diseases. The tomato seedling raising method capable of resisting the root diseases comprises the steps of pretreatment, pretreatment, seedling raising and transplanting. The tomato seedling cultivated by the method is a transgenic chimeric plant, the root system of the tomato seedling is a transgenic root tissue with a root disease resisting effect, and the overground stem, leaf, flower and fruit part is a native tissue which keeps the character characteristics of the original tomato variety, so that the method integrates the advantages of grafting and genetic engineering breeding, and has the advantages of simple and convenient operation of grafting, high yield and the like. The method also has the advantage of wide sources of disease-resistant DNA fragments of genetic engineering breeding, and also overcomes the limitation of grafting adaptability between scions and stocks in a grafting technology and the problem of food safety in genetic engineering breeding.

The present invention relates to a valve stent and an artificial valve. The artificial valve includes a skirt, artificial valve leaflets, and a valve stent. The artificial valve leaflets are disposed inside the valve stent and are connected to the skirt and the valve stent. The skirt includes an inner skirt and an outer skirt. The valve stent includes a flange portion and a main body portion. The flange portion is connected to the inflow end of the main body portion. The flange portion includes an inner layer structure and an outer layer structure arranged from the inside to the outside. The annular surface defined by the inner layer structure does not overlap with the annular surface defined by the outer layer structure, so that the flange portion forms a three-dimensional structure in a manner of internal and external staggered layers. The outer skirt is connected to the inner skirt along the outer layer structure and forms at least one pocket. The pocket is defined with a pocket opening, and the pocket opening is located outside the valve stent and is arranged toward the outflow end of the main body portion. Thus, when the heart contracts, the gap between the flange portion and the native tissue can be filled by the expansion of the pocket, so that the liquid cannot flow back from around the artificial valve, and paravalvular leakage can be better prevented.

Implantable prostheses and related methods are generally described. In some embodiments, the prosthesis (100) may be a generally ellipsoidal (e.g., spherical) shape formed from one or more subunits (20). The subunits may be tapered or frustoconical, formed by manipulating a two-dimensional substrate material. The sidewalls of the subunits may be secured to each other to enhance the stiffness of the prosthesis. In some embodiments, markers (30) may be used to assist in distinguishing prostheses in an implant site by medical imaging (e.g., x-ray imaging). In this manner, an implant site can be easily identified, which can also be a site of recent biopsy and / or resection of diseased tissue. The prosthesis may be formed from a porous material to induce tissue infiltration, which may promote natural tissue regeneration to achieve a more natural tissue appearance and feel. The tissue infiltration enables the prosthesis to have enhanced anti-migration ability after implantation.

Bone plates are disclosed for veterinary uses, for instance for performing distal femur repairs in canines or felines. The bone plates includes various features for better accommodating the anatomy and native tissue structure of the distal femur of an animal and may be utilized for all distal femur fracture patterns. Amongst the features, the head portion of the bone plate is positioned at an angle relative to its shaft portion and includes a curvature configured to match said distal femur; furthermore, head and shaft portions include openings extending along different trajectories.

The present technology is directed to adjustable interatrial shunting systems that selectively control blood flow between the left atrium and the right atrium of a patient. The adjustable interatrial devices include a shunting element having an outer surface configured to engage native tissue and an inner surface defining a lumen that enables blood to flow from the left atrium to the right atrium when the system is deployed across the septal wall. The systems can include an actuation assembly for selectively adjusting a geometry of the lumen and / or a geometry of a lumen orifice to control the flow of blood through the lumen.

Systems and methods for additive-manufactured biocompatible implants. Many embodiments are directed to 30-printed biocompatible resins for fabricating custom implants. In several embodiments, the biocompatible resin is based on a ratio of biocompatible polymers. The biocompatible resin, in accordance with various embodiments, incorporates an antibacterial and / or antimicrobial agent, In some embodiments, the biocompatible resin incorporates a bioceramic to mimic native tissue.