43 results about "Viscoelastic Substances" patented technology

A plunger (30) for an IOL injector device includes a shaft (37) with a distal tip (32) and a compressible sleeve (40) positioned about the shaft with the tip extending forwardly of the sleeve. In a first stage of IOL (12) advancement through the injector device, the plunger tip engages and pushes the IOL through a first section (14a) of the injector body (14). In a second stage of IOL advancement, the sleeve enters the narrowing section (14b) of the injector body toward the open tip (18) thereof with the IOL and sleeve both undergoing compression. The sleeve compresses and lengthens in a forward direction ultimately enveloping the plunger distal tip. Viscoelastic applied inside the injector accumulates between the leading edge of the compressed sleeve and the compressed IOL thereby creating hydraulic pressure which pushes the compressed IOL through the remainder of the injector body and out the open distal tip thereof.

An object of the present invention is to provide: a film which is applicable to a tire, has excellent gas barrier properties and bending resistance, allows weight of a tire to be reduced with improving internal pressure retainability of the tire at both the brand-new stage and the used stage thereof, and is capable of demonstrating good gas barrier properties without breaking especially in a running condition at a relatively low temperature in winter time or the like; an inner liner for tire, using the film; and a tire provided with the inner liner for tire. The film of the present invention comprises at least a layer composed of resin composition (D) produced by dispersing viscoelastic substance (C) in a resin containing modified ethylene-vinyl alcohol copolymer (B) obtained by subjecting ethylene-vinyl alcohol copolymer (A) to a reaction, wherein 100% modulus at −30° C. of the viscoelastic substance (C) is smaller than 6 MPa. The inner liner for tire, and the tire, of the present invention are an inner liner for tire, using said film, and a tire provided with said inner liner for tire, respectively.

A method of micro-incision ophthalmic surgery, comprising, in the order mentioned, the steps of:

(1) injecting a first viscoelastic substance through an incision site which is lateral to corneal into an anterior chamber which is in an opposite part of the incision site with discharging aqueous humor;

(2) injecting a second viscoelastic substance having higher surface tension than that of the first viscoelastic substance through the incision site into the remaining anterior chamber unfilled with the first viscoelastic substance; and

(3) injecting a third viscoelastic substance having lower surface tension than that of the second viscoelastic substance through the incision site into an area of the anterior chamber which is filled with the first viscoelastic substance until the incision site is sealed with the already injected the second viscoelastic substance.

An improved viscoelastic composition useful in the performance of ophthalmic surgical procedures and especially cataract procedures is disclosed. The embodiments of the composition comprise combinations of sodium hyaluronate and chondroitin sulfate and exhibit an improved rheological profile.

An intraocular lens (IOL) injection device is modularized to enable cleaning of internal components after surgery. The device includes first and second housing modules. These modules collectively define a passageway along which an injector rod moves between a retracted position and an extended position. The first module is further configured to accommodate a lens cartridge module. The cartridge module has disposed therein an IOL, in alignment with the passageway. Thus as the rod moves from the retracted position to the extended position, a front portion of the rod that is substantially surrounded by the first module in the retracted position moves into the cartridge module and displaces the IOL. This causes the front portion of the rod to accumulate on it viscoelastic substances. The first module, though, is configured to detach from the second module, to thereby expose the front portion of the rod in the retracted position for cleaning.

A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

The invention discloses a rolling device which can be used for a display screen or a curtain, and comprises a rotating seat, a fixing seat and a visco-elastic material, wherein the rotating seat is hollow and is internally provided with at least one groove chamber; the fixing seat is also hollow, is used for containing the rotating seat, and is also provided with at least one seat groove which is arranged to be staggered with the groove chamber; the visco-elastic material is filled between the seat groove and the groove chamber; therefore, the rotating seat can be conveniently rotated, and the visco-elastic material can be used for slowing down the rotating speed of the rotating seat and reducing the impact force when in rolling. The rolling device can control the rotating speed of the rotating seat by adjusting the filling quantity or viscosity of visco-elastic fluid.

The invention provides a PVB (polyvinyl butyral) film having sound-insulating property, which comprises the following components in percentage by mass: 10-30% of polyethyleneglycol, 19-40% of plasticizer, 40-70% of PVB resin powder, 0.1-2% of antioxidant and 0.05-1% of ultraviolet absorbent. The invention also provides a preparation method of the PVB film having sound-insulating property, which comprises the following steps: adding the viscoelastic substance polyethyleneglycol into the plasticizer, uniformly stirring, and then adding into the PVB resin powder; and plastifying in a plastic extruding machine, and performing film formation through a mold, thus obtaining the PVB film. The invention has the advantages of simple process, convenience in use and satisfactory effect, and can well lower the coupling frequency and further improve the sound-insulating property in comparison with the traditional PVB film.

The invention relates to wet dispersion and forming methods of fiber and particles. The wet dispersion method comprises the steps that water-soluble branched-chain polymers are added into a water system of the fiber and particles, all the materials are stirred and mixed to be uniform, and slurry with the uniformly dispersed fiber and particles is obtained. The effect is better by adding cyclodextrin and visco-elastic materials after the water-soluble branched-chain polymers are added. The invention further provides a forming method of the slurry obtained through the wet dispersion method. The forming method is used for plate producing or spray processing to obtain a coating. The dispersion method is simple, and the dispersion effect is excellent. The branched-chain polymers and cyclodextrin are used for dispersing the particles and fiber, and a flocculating agent is added before a finished product is processed, so that the branched-chain polymers lose efficacy, and follow-up dehydration and forming processing is conducted conveniently.

This relates to vacuum like compound deadening and its preparation technique. The inner of deadening owns vacuum tiny cavity formed by vacuum ceramic ware tiny ball and closed by viscid matter with fibrin stuff making up the outside surface. The preparation technique is disposing hollow ceramic ware tiny ball under 800DEG C-1000DEG C and vacuum, fixing vacuum ceramic ware tiny ball with viscid matter. The volume to vacuum ceramic ware tiny ball of the total volume of admixture is 50% -65%, and hot pressing molding under 200DEG C-400DEG C to spread fibrin stuff on the outside surface of compound stuff. This vacuum like compound deadening owns high sound-absorbing and sound-insulating properties and its thickness is thin and weight is light for clipping and installation.

The invention is directed to a device for extruding viscoelastic matter, in particular pastas. This device has a filling area for introducing matter or constituents of the matter into the device, a conveying area for conveying and processing the flow of matter conveyed through the device, a distributor area for deforming and distributing the flow of matter to a plurality of partial flows of matter, and a die area with a plurality of dies for forming a strand or sheet from the respective partial flows of matter. According to the invention, the inner walls of the distributor area are formed from a viscoelastic material at least in some areas or have a viscoelastic material in these areas.

The invention discloses a device for preparing composite viscoelastic substances. The device comprises a tank. The tank is a cube, first hydraulic rods are arranged in the middles of six inner side surfaces of the tank and are perpendicular to the corresponding inner side surfaces of the tank, the ends of fixed rods of the first hydraulic rods are fixedly connected with the inside of the tank, a hollow sphere is arranged between the inner ends of the six first hydraulic rods, two perpendicular annular grooves are formed in each outer side surface of the hollow sphere and include a horizontal annular groove and a perpendicular annular groove, power sleeves are fixedly mounted at the ends of movable rods of the first hydraulic rods and are coaxial with the center lines of the corresponding first hydraulic rods, the inner ends of the power sleeves deeply extend into the corresponding annular grooves, and power wheels are mounted at the inner ends of the power sleeve and can be matched with the inner bottom surfaces of the corresponding annular grooves in a contact manner. The device has the advantages that the composite viscoelastic substances can be blended at first proportions, canbe comprehensively stirred and can be automatically accommodated, and accordingly procedures for preparing the composite viscoelastic substances are simple and are high in efficiency.

The invention relates to a viscoelastic agent which is suitable for the ophthalmic surgery. The problem can be solved that the artificial lens after the ophthalmic surgery such as cataract surgery isturbid. The viscoelastic agent has biological safety and comprises a viscoelastic substance, a pH buffering agent based on borate, an osmotic pressure conditioning agent and water.

A fluorescent viscoelastic agent for eye operation is prepared from a fluorescent substance and a non-fluorescent viscoelastic substance through physical and/or chemical mixing. It may have one color or the mixture of more colors chosen from white, red, blue, yellow, green, purple, and orange. It can improve the contrast and stereo feeling in visional field of doctor.

Especially physically stable metal oxide catalyst supports are prepared by suspending a metal oxide in a continuous phase, activating by fine dispersion, coagulation to a viscoelastic mass, shaping, drying, and calcining. The catalyst support thus prepared may be treated with catalytic agents to produce supported catalysts for olefin oxidation.

The invention discloses a viscoelastic agent material with an oxidation and/or reduction characteristic. The viscoelastic agent material with a function of protecting corneal endothelial cells comprises oxidation substances and/or reduction substances, viscoelastic substances, osmotic pressure regulators, pH buffering agents and water.

A novel phakic intraocular lens implantation without viscoelastics and an instrument thereof. The special designed instrument is employed to achieve a purpose of maintaining an anterior chamber only with a perfusion liquid in the surgery, so as to get rid of the influence of the viscoelastics completely. The viscoelastics are not used, so that there is no need to inject the viscoelastics or remove the viscoelastics as in traditional methods, the surgery time is shortened such that total time of surgical procedures from incision construction to incision hydration can be reduced to only 1˜3 minutes, and viscoelastic-related complications, such as postoperative high intraocular pressure and lens opacity, are completely avoided.

A colored viscoelastic agent for eye operation is prepared from a coloring substance and a non-color viscoelastic substance through physical and/or chemical mixing. It may have one color or the mixture of more colors chosen from white, red, blue, yellow, green, purple, and orange. It can improve the contrast and stereo feeling in visional field of doctor.