113 results about "Polypropylene mesh" patented technology

An implantable hernial prosthesis having top and bottom layers and a central sleeve to facilitate manual expansion and placement of the prosthesis within an incision in a patient. The top layer and a bottom layer are secured together with at least one seam at the perimeter of the prosthesis. The top layer is made of a synthetic mesh, preferably polypropylene mesh, to promote incorporation into the abdominal wall, and the bottom layer is made of the same material or in some cases of a mechanical barrier to prevent adhesions to the intestine. The top layer is provided with a central sleeve to introduce one or two fingers to expand the prosthesis in place, and also to introduce an articulated hernial stapler to secure the mesh into the abdominal wall.

A suture-less, tension free, one-piece, double layer, inguinal hernia repair prosthetic is preferably formed of a single piece or sheet of repair fabric, such as polypropylene mesh, PTFE mesh, biologic material, or combinations thereof. The prosthetic sheet preferably includes a fold line dividing the sheet into two general halves. Each prosthetic half of the prosthetic sheet is preferably shaped generally to fit within the inguinal canal. Each prosthetic half of the sheet includes an opening in the inner portion of the sheet and a slit extending to the peripheral portion of the prosthetic half. The slits extend to generally opposite side of the prosthetic. Each opening is adapted to receive a patient's spermatic cord structure there through.

An improved composite prosthesis for laparoscopic repair of inguinal or femoral hernias, and also for the laparoscopic repair of large incisional ventral hernias incorporates two different layers, namely an upper layer made of polypropylene mesh to promote tissue ingrowth, and a lower layer formed with an adhesion barrier material to prevent adhesions to the intestines. Both layers are secured together with a highly visible dark seam at the perimeter of the prosthesis to assist the surgeon in visualizing the peripheral edge. The lower layer is slightly larger than the polypropylene mesh so there is an adhesion barrier edge around the prosthesis to conceal the edges of the polypropylene mesh. The upper layer includes a guiding cone to facilitate placement of the prosthesis at the exact center of the hernial defect. The base of this cone is attached to the central part of the prosthesis, and the apex of the cone will be attached later to a guiding thread that is inserted to from the outside of the abdomen using a long straight needle through the skin and hernial sac. Furthermore the laparoscopic hernia prosthesis lower layer is provided with a bounding rim to guide the tip of the spiral tacker to the very edges of the prosthesis in order to stretch the prosthesis in place, and also to conceal the staples or tacks.

A method of making a composite prosthetic device, such as a hernia repair device, includes providing a support layer, juxtaposing a layer of an absorbable material with the support layer, and disposing an absorbable adhesive between the support layer and the layer of an absorbable material. The method includes heating the layers for melting the absorbable adhesive so as to bond the support layer with the layer of the absorbable material. Before the heating step, the moisture content of at least one of the layers is increased for improving thermal conductivity between the layers so as to enhance the strength of the bonds formed between the layers. The moisture content may be increased by exposing at least one of the layers to an environment having elevated relative humidity. In one embodiment, the support layer is polypropylene mesh, the layer of the absorbable material is oxidized regenerated cellulose, and the absorbable adhesive is polydioxanone.

An improved extruded polypropylene sheet that contains a high level of beta crystallinity and a process for making such sheets are disclosed herein. The polypropylene sheet contains at least one layer of a resinous polymer of propylene and an effective amount of beta spherulites. The beta spherulites in the sheet are produced by the incorporation of a beta nucleating agent in the polymer. The presence of the beta spherulites in the sheet facilitates the process of post-stretching the perforated sheet to produce a uniaxially or biaxially oriented mesh structure, and also broadens the temperature range over which this stretching can be performed. The final mesh has a lower density than a polypropylene mesh without beta spherulites. The perforated beta nucleated sheet also exhibits different stretching characteristics during the orientation steps such that more resinous polymer is drawn out of the node junction region between the machine direction and transverse direction oriented strands and a greater percentage of the web area has a solid polymer structure. This altered stretching behavior results in an oriented web that has higher strength and torsional rigidity characteristics. Thus lighter weight mesh structures which meet all of the physical property requirements for end-use applications, such as reinforcing grids to stabilize concrete and soil in civil engineering and landfill applications, are produced. The lighter weight extruded beta nucleated sheet can also be stretched at higher line speeds, thereby reducing the manufacturing costs.

Improved extruded polypropylene sheets containing a high level of beta crystallinity and a process for making such sheets are disclosed herein. The polypropylene sheets comprise a resinous polymer of propylene and an effective amount of beta spherulites. Uniaxially or biaxially oriented mesh structures produced from the disclosed sheets exhibit lower density, higher strength, and higher torsional rigidity than polypropylene meshes without beta spherulites. Thus, lighter weight mesh structures which meet all of the physical property requirements for end-use applications, such as reinforcing grids to stabilize concrete and soil in civil engineering and landfill applications, are produced. The lighter weight extruded beta-nucleated sheet can also be stretched at higher line speeds, thereby reducing manufacturing costs. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

The present invention discloses an antiblocking hernia patch and a preparation method thereof. A polypropylene net is combined with an absorptive material chitosan antiblocking piece to prepare a partial absorptive composite mesh. The invention is characterized in that the absorptive material chitosan antiblocking piece is prepared from water-soluble chitosan by a tap casting method. The chitosan phlegm is arranged between the polypropylene net and the absorptive material chitosan antiblocking piece. The preparation method comprises the steps of preparing the chitosan antiblocking piece, uniformly coating one layer of chitosan on the polypropylene woven mesh, then placing the chitosan antiblocking piece on the polypropylene woven mesh, placing the polypropylene woven mesh between the moulds after compressing, and obtaining the antiblocking hernia patch after drying by a film isolation method in the environment at a temperature of between 15 DEG C below zero and 150 DEG C and pressure of 0 to 0.6MPa. The antiblocking hernia patch of the invention has the advantages of effectively preventing the blocking after surgery, increasing the anti-inflection effect, sustaining the excellent repairing strength, reducing the recurrence rate and complication after surgery, reducing the probability of adverse effect caused by the unthorough elimination of acid, simply controlling preparation process and eliminating the adverse effect which may be caused by the chemical process.

A floatable-material harvester is disclosed, including a vacuum source, transport hose, and a floatable-material receiver. In one embodiment, the transport hose has at least one air inductor / intake along its length, which allows air to enter the transport hose to accelerate its contents, by negative pressure air induction. In another embodiment, a transport hose has at least one floatable-material thruster along its length, comprised of at least one nozzle, which provides pressurized fluid (e.g., air or water) in the direction of the flow of the harvested floatable material by positive pressure induction. A method is disclosed whereby the floatable material harvester is used to harvest an absorbent material (e.g., wood chips, straw, perlite, zeolite, polypropylene mesh, titanate nanofibres) that has absorbed a pollutant (e.g., oil, solvent, radioactive isotopes) from a beach or in water.

A floatable-material harvester is disclosed, including vacuum source, transport hose, and a floatable-material receiver. In one embodiment, the transport hose has at least one air inductor / intake along its length, which allows air to enter the transport hose to accelerate its contents, by negative pressure air induction. In another embodiment, a transport hose has at least one floatable-material thruster along its length, comprised of at least one nozzle, which provides pressurized fluid (e.g., air or water) in the direction of the flow of the harvested floatable material by positive pressure induction. A method is disclosed whereby the floatable material harvester is used to harvest an absorbent material (e.g., wood chips, straw, perlite, zeolite, polypropylene mesh, titanate nanofibres) that has absorbed a pollutant (e.g., oil, solvent, radioactive isotopes) from a beach or in water.

Improved extruded polypropylene sheets containing a high level of beta crystallinity and A process for making such sheets are disclosed herein. The polypropylene sheets comprise a resinous polymer of propylene and an effective amount of beta spherulites. Uniaxially or biaxially oriented mesh structures produced from the disclosed sheets exhibit lower density, higher strength, and higher torsional rigidity than polypropylene meshes without beta spherulites. Thus, lighter weight mesh structures which meet all of the physical property requirements for end-use applications, such as reinforcing grids to stabilize concrete and soil in civil engineering and landfill applications, are produced. The lighter weight extruded beta-nucleated sheet can also be stretched at higher line speeds, thereby reducing manufacturing costs.

The invention discloses a preparation method of an anti-adhesion polypropylene mesh coated with polydopamine for abdominal wall defect repair and an obtained mesh material. The mesh uses a mesh woven by using polypropylene as a skeleton and the surface is coated with polydopamine; the mesh has the characteristic of reinforcing abdominal wall tension, preventing adhesion and tolerating infection, can be placed in a peritoneal cavity and is a brand new medical abdominal external hernia repair material. The specific preparation method of the mesh comprises the steps of putting the polypropylene mesh in trometamol solution, then adding dopamine hydrochloride and performing conditioned reaction to finally obtain the anti-adhesion polypropylene mesh coated with polydopamine.

The present invention provides an implantable prosthesis comprising a viscera separating barrier that defines a shell having a pocket with an opening that receives an insert. It is contemplated that the insert comprises at least one of an absorbable mesh, a non-absorbable mesh, or an absorbable and non-absorbable mesh combination inserted into the pocket through the opening. In preferred embodiments the viscera separating barrier is acellular collagen, and the absorbable mesh is selected from at least one of a polyglactin, a polyglycolic acid, a polyglactin and a polylactic acid, and the non-absorbable mesh comprises a polypropylene mesh. It is contemplated that the viscera separating barrier acts to reduce or even eliminate attachment of viscera to the prosthesis to encourage rapid cell penetration and revascularization; the non-absorbable mesh will provide immediate, reliable in-growth; and the absorbable mesh will give stability to the prosthesis.

The invention discloses a method for preparing high-purity low-sulfur expanded graphite, which belongs to the preparation method of expanded graphite. The existing chemical method of the present invention to prepare expanded graphite has the technical problems of low product purity and high production cost. The method of the present invention: 1. high-temperature purification of phosphorus flake graphite; 2. putting it into a polypropylene mesh bag, soaking it in peroxide water, and lifting it to pour water; 3. wrapping the graphite block with a polypropylene mesh bag as an anode, and putting In the graphite electrolytic cell, then inject the electrolyte solution, use graphite as the cathode, and then electrolyze. During the electrolysis process, the polypropylene mesh bag is inflated and stirred; 4. Constant temperature drying and expansion; that is, high-purity low-sulfur expanded graphite is obtained. The method of the invention is simple and easy to operate, and the degree of intercalation can be controlled by adjusting the current intensity and electrolysis time, and the prepared high-purity expanded graphite is low in sulfur, and there is no pollution to the water body during the washing process, and no other impurities are doped in the product. The invention uses a small amount of oxidant to trigger, little or almost no pollution in production, and relatively low production cost.

The invention relates to the field of environmental protection, and discloses a device for protecting a slope from scouring erosion of runoff. The device comprises a reinforced three-dimensional polypropylene mesh pad, an anchor rod, U-shaped nails, soil improvement fiber mixtures, vegetation seeds, anti-erosion fiber mixtures, weights and a non-woven fabric; the reinforced three-dimensional polypropylene mesh pad is fixed on an anchoring groove of the slope through the anchor rod and then is filled with the weights, and the reinforced three-dimensional polypropylene mesh pad is anchored on the surface of the slope and the surface of the anchoring groove of the slope through the U-shaped nails; a mixture of the vegetation seeds and the soil improvement fiber mixtures and a mixture of the vegetation seeds and the anti-erosion fiber mixtures are sequentially sprayed on the surface of the reinforced three-dimensional polypropylene mesh pad; and the non-woven fabric covers the surfaces ofthe vegetation seeds and the anti-erosion fiber mixtures to form the device for preventing the slope from the erosion of the runoff. Therefore, the device is suitable for ecological protection of various slopes, dams, river shoals and the like, has strong anti-erosion performance and can effectively resist the scouring erosion of the runoff.

The invention relates to a chitosan biofilm polypropylene mesh and a preparation method thereof. According to the invention, a polypropylene mesh is processed by using waterless ethanol and deionized water; the polypropylene mesh is modified by using 1.0 to 5.0% of a chitosan film forming solution through a process of biofilm forming, such that a chitosan biofilm polypropylene mesh is obtained. The method of the invention is simple and operable. No toxic or harmful reagent is included. No adverse effect is brought to subsequent applications of the medical mesh. According to the invention, the polypropylene mesh has a high porosity, peripheral tissue can well contact and grow on the polypropylene mesh, such that the anti-stretching property of a repaired part is enhanced; also, chitosan has a good biocompatibility, such that complications such as polypropylene mesh erosion, exposure and tissue adhesion at an implantation position are effectively reduced. The chitosan biofilm polypropylene mesh is especially suitable for clinical women pelvic reconstructive surgery. With the chitosan biofilm polypropylene mesh, histocompatibility of the polypropylene materials in pelvic reconstructive operations is improved, and pelvic reconstruction postoperative complications are reduced.

The invention discloses high-strength impermeable anti-freezing concrete and a preparation method thereof. The high-strength impermeable anti-freezing concrete is prepared from the following raw materials: cement, water, sand, stones, fly ash, an anti-freezing agent, a rust-inhibiting anti-corrosion waterproof agent, waste concrete particles and waste rubber particles. The anti-freezing agent is prepared from the following components in parts by weight: 3.4 to 6.8 parts of modified coal gangue; 1.2 to 2.0 parts of rice hull ash, 1.5 to 3 parts of vinyl acetate-ethylene copolymer latex powder;0.8 to 1.6 parts of silicon powder; 2.4 to 3.8 parts of polypropylene reticular fiber; 0.8 to 1.6 parts of seaweed extract; 0.9 to 1.8 parts of urea; 1.4 to 2.2 parts of calcium nitrite and 10 to 20 parts of water. The high-strength impermeable anti-freezing concrete has the advantages of effective utilization of waste materials, strong freeze-thaw resistance and mechanical properties, reduction of freeze-thaw diseases of concrete in cold regions, and purification of automobile exhaust.

A padded corner bumper comprises an elongated core formed of a cushioning material, an outer decorative cover formed of vinyl-coated fabric, and a backing material formed of polypropylene mesh. The core has a front, a back coextensive with the front, and a continuous side edge extending between the top and bottom. The outer decorative cover and backing material are stitched together to form a casing that completely surrounds the core, the backing being positioned only over the back of the core. The padded corner bumper is sufficiently flexible to allow it to wrap around an outside corner created by two mutually perpendicular surfaces. The corner bumper has a non-uniform horizontal cross section perpendicular to the axis. For three-sided corners, a top cushion is attached to a second side cushion that wraps around the vertical edge.

The invention relates to the field of desert greening, and discloses a desert sand-fixation greening device and a desert sand-fixation greening method. The desert sand-fixation greening device comprises a reinforced three-dimensional polypropylene mesh pad, U-shaped nails, vegetation seeds and a soil improvement fiber mixture and an antierosion fiber mixture, wherein the reinforced three-dimensional polypropylene mesh pad is anchored on the surface of a desert through the U-shaped nails; and the soil improvement fiber mixture and the antierosion fiber mixture are successively sprayed into meshholes and onto mesh surface of the reinforced three-dimensional polypropylene mesh pad. The desert sand-fixation greening device provided by the invention has reasonable and compact structure, is convenient to construct, has desert-fixation effect, and can weaken the damage of migratory dune and wind-blown sand to plants; meanwhile, the desert sand-fixation greening device has water-retaining andnutrient-preserving properties, meets the growth demands of desert plants, and improves the survival rate of the desert plants. The desert sand-fixation greening device provides a novel vision for solving the problems of migratory dune displacement and desert plant growth, and has broad application prospects in sand fixation and desert greening.

The present invention discloses a preparation method of a material for abdominal wall defect intraperitoneal repair, and the obtained material thereof. The preparation method comprises: 1, preparing a quaternized bacterial cellulose solution; 2, carrying out polydopamine modification on a polypropylene mesh sheet; and 3, coating the quaternized bacterial cellulose solution on the obtained polypropylene mesh sheet. The present invention further provides the material used for the abdominal wall defect intraperitoneal repair and obtained through the process. The obtained material of the present invention has characteristics of good mechanical property, good biocompatibility, good adhesion resistance and good antibacterial property.

A transobturator technique was developed for treating male urinary incontinence. This approach helped to design specific instruments to pass around the ischio-pubic branches of the male pelvis from inside to outside (i.e from the suburethral space to the thigh fold). The inside-out transobturator sling technique uses specific instruments and a polypropylene mesh with two arms that are passed inside to outside through the obturator foramens, pulled for compressing the bulbar urethra upward, and tied to each other across the midline. The mesh passes around the ischio-pubic branch before being tied under the bulbar urethra where it brings tension and support.

Implant systems and methods are provided to include a treatment material with a pelvic implant device. The pelvic implant device, such as an incontinence sling, can include the treatment coating combination of polycarbonate (PC) and an infection prevention material, such as InhibiZone® (IZ) technology. The treatment material can be coated onto, or impregnation or integrated with, polypropylene mesh in order to prevent infection and promote healing.

A method of making a composite prosthetic device, such as a hernia repair device, includes providing a support layer, juxtaposing a layer of an absorbable material with the support layer, and disposing an absorbable adhesive between the support layer and the layer of an absorbable material. The method includes heating the layers for melting the absorbable adhesive so as to bond the support layer with the layer of the absorbable material. Before the heating step, the moisture content of at least one of the layers is increased for improving thermal conductivity between the layers so as to enhance the strength of the bonds formed between the layers. The moisture content may be increased by exposing at least one of the layers to an environment having elevated relative humidity. In one embodiment, the support layer is polypropylene mesh, the layer of the absorbable material is oxidized regenerated cellulose, and the absorbable adhesive is polydioxanone.

The invention relates to a special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries, and belongs to the technical field of concrete. The special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries comprises, by weight, 8 to 20 parts of cement. 10 to 25 parts of pebbles, 15 to 25 parts of tailings; 25 to 40 parts of sand, 1 to 5 parts of fly ash, 1 to 4 parts of microspheres, 1 to 4 parts of nano mineral powder, 0.05 to 0.2 part of basalt fiber, 0.08 to 0.16 part of polypropylene net-shapedfiber, 0.1 to 1 part of a water reducing agent component, 0.5 to 3 parts of an expanding agent, 0.1 to 1 part of a cement-based capillary crystalline material and 3 to 10 parts of mixing water I; theinvention further relates to a preparation method of the special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries. The preparation method comprises the following steps: S1, preparing a mixture; S2, pre-wetting the mixture; S3, preparing a mixed water agent; and S4, preparing the concrete. The anti-seepage and anti-cracking performance of concrete in the later period can be improved, and shrinkage of concrete is reduced.

The invention provides a Hirudo nipponia net cage breeding method and a special net cage thereof. The escape prevention and feeding functions of Hirudo nipponia are integrated, and the Hirudo nipponia net cage breeding method and the special net cage of the Hirudo nipponia net cage breeding method can adapt to pond breeding, cement pit breeding, breeding in a laboratory and various conditions. According to the special net cage for the Hirudo nipponia net cage breeding, the net cage is of a closed structure of a hollow-structure cuboid or cube, a metal or plastic framework is arranged on the inner side of the net cage, polyethylene or polypropylene meshes adhere to the framework, and the whole special net cage mechanism is supported by the framework and is stable. The problems that Hirudo nipponia feeding is difficult, aquaculture water can be easily polluted, the death rate of the Hirudo nipponia is high, the Hirudo nipponia can be easily invaded by natural enemies, and escape prevention is difficult are solved, and conditions are created for large-scale breeding of the Hirudo nipponia.

The invention relates to a polypropylene mesh / electro-spinning nano-fiber membrane as well as a preparation method and an application thereof. The polypropylene mesh / electro-spinning nano-fiber membrane is prepared through the following steps: (1) preparing a chitosan-polyethylene glycol hydrogel; (2) preparing basic fibroblast growth factor (bFGF) embedded polylactic acid-poly lactic-co-glycolic acid (PLGA) microspheres; (3) preparing an electro-spinning solution; (4) preparing the polypropylene mesh / electro-spinning nano-fiber membrane by use of an electro-spinning method. According to the polypropylene mesh / electro-spinning nano-fiber membrane, the polypropylene mesh and the nano-fiber membrane are compounded creatively, and therefore, the biocompatibility of the polypropylene mesh is improved by use of the nano-fiber membrane and the tensile strength of the nano-fiber membrane is improved by use of the polypropylene mesh, and the polypropylene mesh and the nano-fiber membrane supplement each other; in addition, the microspheres are introduced to realize controlled drug release; as a result, lots of defects of the clinical existing polypropylene meshes can be overcome.

The invention relates to an abdominal hernia repair mesh specially used for an open surgery, belonging to the technical field of medical consumables. The abdominal hernia repair mesh specially used for the open surgery comprises a polypropylene mesh and an absorbable membrane layer, wherein the surface of the polypropylene mesh is dipcoated with an absorbable coating, and the absorbable membrane layer is laminated on the polypropylene mesh; the area of the absorbable membrane layer is larger than that of the polypropylene mesh; the edge of the absorbable membrane layer is turned over and folded to the other side surface of the polypropylene mesh and then is fixed to form a locating bag. Compared with hot-pressing or molding by casting, the anti-adhesion patch enables polypropylene and the anti-adhesion membrane to be completely nested with each other, and microscopic examination proves no obvious boundary surface exists, so that the phenomenon of stratification does not occur. The abdominal hernia repair mesh is more easily used in the open surgery; the time of the surgery is shortened, the mesh is flatter after being implanted, the contact between the polypropylene and visceral organs such as intestinal canal and the like can be avoided to the utmost extent.

The invention provides a complex hernia patch and a preparing method and application thereof. The complex hernia patch comprises three layer structures which are an outer biological layer, an inner supporting layer and an outer biological layer from bottom to top respectively, wherein the outer biological layers are accellular stent layers, and the inner supporting layer is a polypropylene mesh layer. The complex hernia patch prepared through the preparing method comprises the three layer structures, accellular stents in contact with tissue are located on the outer layers, cells can be induced to grow, and thus infection of a hernia coloboma part and formation of scars can be reduced; the polypropylene mesh layer serves as the inner supporting layer so that the mechanical strength of the complex hernia patch can be maintained, the stability of the patch can be improved, and high abdomen expansion pressure can be borne; furthermore, the binding force of the inner layer and the outer layers is good, and thus the problems that due to the fact that the strength of an existing product is not stable, high abdomen expansion pressure cannot be borne, a stent is gradually degraded after cells grow into the stent, consequently tardive pain of hernia repair is brought and relapse is likely to occur can be effectively solved; in addition, the preparing method is simple and capable of being applied to industrial production.

The invention provides a composite polypropylene patch for mitigating foreign matter reaction and preventing adhesion. The composite polypropylene patch is characterized by comprising a polypropylenewarp-knitted macroporous mesh, chondroitin sulfate / gelatin porous crosslinked sponge and an anti-adhesion film, wherein the polypropylene warp-knitted macroporous mesh is used as an intermediate support layer, the chondroitin sulfate / gelatin porous crosslinked sponge is penetratingly wrapped around the polypropylene warp-knitted macroporous mesh, and the anti-adhesion film is attached to one sideof the chondroitin sulfate / gelatin porous crosslinked sponge. A preparation method comprises the steps of performing plasma hydrophilic activation on the polypropylene mesh, immersing the polypropylene mesh in a mixed solution of chondroitin sulfate and gelatin, covering the mesh with a nanofiber membrane, performing integral freeze-drying, soaking the mesh in an EDC / NHS solution to conduct sufficient cross-linking, soaking the mesh in deionized water to remove impurities, and performing freeze-drying. The prepared composite polypropylene patch has anti-inflammation and anti-adhesion functions, and is light, soft, and convenient for surgical operation, thereby having a good application prospect.