44 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 plunger for an IOL injector device includes a shaft with a distal tip and a compressible sleeve positioned about the shaft with the tip extending forwardly of the sleeve. In a first stage of IOL advancement through the injector device, the plunger tip engages and pushes the IOL through a first section of the injector body. In a second stage of IOL advancement, the sleeve enters the narrowing section of the injector body toward the open tip 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.

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.

A system has been developed for injecting a biodegradable pericardial constraint including: a biodegradable viscoelastic substance (BES); an external injection container for the BES; a cannula having a distal section adapted to be inserted into a pericardial sac of a mammalian heart and a proximal section connectable to the external injection container; wherein BES from the injection container is injected into the pericardial sac through the cannula.

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.

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.

Aspects of the present disclosure are directed to an ocular drainage device that includes a stability system. The stability system includes a plate, and can further include a material comprising collagen covering at least a portion of a top surface of the plate, and / or a viscoelastic substance covering at least a portion of the plate's top surface. The plate is formed of a flexible material and includes a tube retaining structure integrally formed therewith, wherein the tube retaining structure is configured to hold a tube that is at least partially surrounded by the tube retaining structure to the plate when the tube is moved. The tube retaining structure can include a low profile ridge, and / or a channel having an undercut or horseshoe shape. The plate has at least one plate channel, including a plate channel configured for carrying the tube. The plate can further include a reservoir.

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.

A cathode unit for a battery, in which the cathode includes a viscoelastic, and a polymeric gel former selected from the group of natural polysaccharides having a proportion of carboxylate or carboxylic acid groups of greater than or equal to 0.5 and less than or equal to 2.0 in relation to the number of monomer units. Also described is a method for manufacturing the cathode units and the use of a battery including the cathode unit according to the invention for power supply.

A micro-electromechanical transducer including one or more moveable members, and a viscoelastic substance having a predetermined viscoelasticity, the viscoelastic substance being adapted to influence the response of the transducer in a predetermined manner. The micro-electromechanical transducer of the present invention may include a MEMS transducer, such as a MEMS microphone, a MEMS vibration sensor, a MEMS acceleration sensor, a MEMS receiver.

The problem of the present invention is to provide a method of efficiently producing therapeutic alternative corneal endothelial cells, particularly, a method capable of stably producing them in a condition suitable for intraocular transplantation (in the anterior chamber) in a large amount. Furthermore, the present invention aims to provide a composition for transplantation, which is preferable for intraocular administration, particularly, into the anterior chamber. A therapeutic alternative corneal endothelial cell sphere can be produced by culturing stem cells in suspension in a differentiation induction medium containing a GSK3 inhibitor, retinoic acid and a ROCK inhibitor. Addition of a viscoelastic substance during intraocular (into the anterior chamber) transplantation of the sphere or cultured corneal endothelial cells dispersed into single cells can increase the number of adherent cells after transplantation.

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 problem of the present invention is to provide a method of efficiently producing therapeutic alternative corneal endothelial cells, particularly, a method capable of stably producing them in a condition suitable for intraocular transplantation (in the anterior chamber) in a large amount. Furthermore, the present invention aims to provide a composition for transplantation, which is preferable for intraocular administration, particularly, into the anterior chamber. A therapeutic alternative corneal endothelial cell sphere can be produced by culturing stem cells in suspension in a differentiation induction medium containing a GSK3 inhibitor, retinoic acid and a ROCK inhibitor. Addition of a viscoelastic substance during intraocular (into the anterior chamber) transplantation of the sphere or cultured corneal endothelial cells dispersed into single cells can increase the number of adherent cells after transplantation.

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.

The present invention relates to a process and device for determining the surface friction coefficients of bodies, in particular of catheters. In the invented process, the to-be-examined catheter (1) is pulled with a defined velocity through a gel-like viscoelastic substance (2) and the frictional force required therefor is measured. A defined pressure is applied to this viscoelastic substance in such a manner that a defined surface normal force acts on the catheter surface. By applying a given, defined pressure on the substance, the surface pressure on each area element of the catheter surface is precisely given and can be held constant. By holding the area to which pressure is applied constant, the entire acting normal force can also be held constant and the friction coefficient can be determined for any catheter diameter and for any catheter consistency. Determination of the friction coefficient is reproducible and only depends on the surface friction.

A micro-electromechanical transducer including one or more moveable members, and a viscoelastic substance having a predetermined viscoelasticity, the viscoelastic substance being adapted to influence the response of the transducer in a predetermined manner. The micro-electromechanical transducer of the present invention may include a MEMS transducer, such as a MEMS microphone, a MEMS vibration sensor, a MEMS acceleration sensor, a MEMS receiver.

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.

The invention discloses a device for eliminating crystalline lens equator epithelial cells. The device comprises a handheld rod and a connecting rod connected to one end of the handheld rod. The tailend of the connecting rod is bent to form a working rod. A polishing rod is connected to the side wall, close to the near end, of the top face of the working rod. The ends of the working rod and the polishing rod are formed into cambered surfaces, and the portion, close to the end, of the top face of the polishing rod is provided with a round obtuse part transited from the cambered surfaces to thetop face of the polished rod. High-efficiency front capsule polishing can be performed when capsulorhexis is just completed and crystals are not taken out, no viscoelastic substance needs to be adopted in the polishing process, intraocular hypertension complications are avoided, the problem that cortex and a capsule opening are tightly stuck after femtosecond capsulorhexis can be solved, the front capsule polishing operation can be completed easily for microcoria operation, the phenomenon that bowl-shaped cortex shells are formed in the ultrasonic emulsification process can be avoided, and the back capsule cracking risk is lowered; meanwhile, the front end is provided with a flexible extension rod capable of stretching into the equator for polishing, and the equator can be polished.

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.