53results about How to "Reduce fretting" patented technology

An intramedullary fixation assembly usable with different long bone types and a guide assembly for guiding deployment of the intramedullary fixation assembly. The intramedullary fixation assembly includes a fixation member that has ends and a curved body extending between the ends. The curved body of the fixation member has a radius of curvature configured to extend through the medullary canal regardless of the long bone anatomy. Fasteners fix the fixation member to the bone fragments and are guided by a guide assembly. The guide assembly includes a guide body defining openings configured to guide the fasteners through openings defined in the fixation member and into the bone fragments. A fixation end of the guide body includes a pair of opposing, converging surfaces that are configured to engage in a positive fit with an exposed end of the fixation member accessible through the side aperture in the first fragment.

The present invention is directed generally to a biomedical system(s) and method(s). More specifically, some embodiments may include system(s) and method(s) used in medical treatment(s). Various embodiments may include medical system(s) and method(s) that may use an anchoring mechanism and screw (bolt, etc.) arrangement that increases the strength of attachment. Some embodiments may further include, for example, an anchoring mechanism that expands upon insertion of a screw (bolt, etc.) into an opening. Some embodiments may include, for example, a system(s) and method(s) for improvement of structural tissue (e.g., bone, cartilage) fixation and safety. Further, some embodiments may also include, for example, an anchoring mechanism and screw (bolt, etc.) system that may be utilized in orthopedic procedures. Still some embodiments may further include system(s) and method(s) providing improved screw fixation and enhanced stabilization in structural tissue or fracture repair. Various embodiments may include multiple anchor mechanisms and anchor mechanism holding means.

An intramedullary fixation assembly usable with different long bone types and a guide assembly for guiding deployment of the intramedullary fixation assembly. The intramedullary fixation assembly includes a fixation member that has ends and a curved body extending between the ends. The curved body of the fixation member has a radius of curvature configured to extend through the medullary canal regardless of the long bone anatomy. Fasteners fix the fixation member to the bone fragments and are guided by a guide assembly. The guide assembly includes a guide body defining openings configured to guide the fasteners through openings defined in the fixation member and into the bone fragments. A fixation end of the guide body includes a pair of opposing, converging surfaces that are configured to engage in a positive fit with an exposed end of the fixation member accessible through the side aperture in the first fragment.

The present invention is directed generally to a biomedical system(s) and method(s). More specifically, some embodiments may include system(s) and method(s) used in medical treatment(s). Various embodiments may include medical system(s) and method(s) that may use an anchoring mechanism and screw (bolt, etc.) arrangement that increases the strength of attachment. Some embodiments may further include, for example, an anchoring mechanism that expands upon insertion of a screw (bolt, etc.) into an opening. Some embodiments may include, for example, a system(s) and method(s) for improvement of structural tissue (e.g., bone, cartilage) fixation and safety. Further, some embodiments may also include, for example, an anchoring mechanism and screw (bolt, etc.) system that may be utilized in orthopedic procedures. Still some embodiments may further include system(s) and method(s) providing improved screw fixation and enhanced stabilization in structural tissue or fracture repair. Various embodiments may include multiple anchor mechanisms and anchor mechanism holding means.

Motor vehicles designed as station wagons having a large roof opening have a tendency toward body shaking. To minimize body shaking, at least one foam composite component is provided in the node region of a rear pillar and an additional body structural component. The foam composite component includes a base body which is coated in places with a foam material. As the result of heat treatment the foam material expands and fills the cavity in the node region in a manner which increases rigidity.

A cam shaft support / enclosure assembly for brake systems of heavy-duty vehicles is mounted on a beam of an axle / suspension system and includes a cam tube. A bracket for mounting the cam tube on the beam includes a pair of plates that are mounted on the beam. Each one of the plates is formed with an opening for receiving the cam tube and includes at least three tabs, and preferably four tabs, that extend outwardly from each respective plate adjacent the opening and contact the outer surface of the cam tube. Each tab includes a generally arched and optionally textured face for mating with an outer surface of the cam tube, which may also be optionally textured, so that when the plates are mounted the tabs engage the cam tube in a press-type fit, minimizing movement of the cam tube.

The invention relates to methods of stabilizing bone implants, comprising inserting a self tapping implant having at least two helical grooves running in opposite directions around the implant.

Disclosed herein is a new improved large planetary gear system used on the input stage of wind turbine power generators. This improved planetary gear system reduces or eliminates lubricant debris traditionally generated from the gear teeth, thereby eliminating an initiating source for bearing failure. To achieve these results, some and preferably all of the gear teeth within the planetary gear system are superfinished using chemically accelerated vibratory finishing to a surface roughness of approximately 0.25 micron or less. Several objects and advantages of the invention are to provide a gearbox with reduced metal debris, improved bearing life, reduced wear, reduced vibro-frictional noise, improved contact fatigue, improved fretting resistance, improved lubrication, to simplify the run-in process, and to enhance the durability and efficiency of the gearbox.

The invention relates to methods of stabilizing bone implants, comprising inserting a self tapping implant having at least two helical grooves running in opposite directions around the implant wherein the implant generates a minimum of bone debris during insertion and implant is integrated within 3-6 weeks.

A rope (210, 310) having a three-layered structure comprising a core layer, an inner layer and an outer layer, the core layer comprising one strand (225, 315), the inner layer comprising multiple strands (220) with an amount n and the outer layer comprising multiple strands (215) with an amount m, wherein n is an uneven number, and m is a number which has no common divisor with n, each strand is formed by multiple twisted metal filaments. By this structure fretting of the strands is reduced and the life time of the rope is improved. Also, the use of the rope in lifting application and an elevator system comprising such a rope are disclosed.

A method for surface treating a titanium gas turbine engine component. The method includes providing a gas turbine engine component having a titanium-containing surface. The component is heated to a temperature sufficient to diffuse carbon into the titanium and below 1,000° F. The surface is contacted with a carbon-containing gas to diffuse carbon into the surface to form carbides. Thereafter, the carbide-containing surface is coated with a lubricant comprising a binder and a friction modifier. The binder preferably including titanium oxide and the friction modifier preferably including tungsten disulfide. The coefficient of friction between the surface and another titanium-containing surface is less than about 0.6 in high altitude atmospheres.

A cam shaft support / enclosure assembly for brake systems of heavy-duty vehicles is mounted on a beam of an axle / suspension system and includes a cam tube A bracket for mounting the cam tube on the beam includes a pair of plates that arc mounted on the beam. Each one of the plates is formed with an opening for receiving the cam tube and includes at least three tabs, and preferably four tabs, that extend outwardly from each respective plate adjacent the opening and contact the outer surface of the cam tube. Each tab includes a generally arched and optionally textured face for mating with an outer surface of the cam tube, which may also be optionally textured, so that when the plates are mounted the tabs engage the cam tube in a press-type fit, minimizing movement of the cam tube

The invention discloses a medical degradable magnesium alloy interbody fusion cage, relates to an interbody fusion cage and aims at solving problems that inflammation is caused due to acidic materials which are produced by existing interbody fusion cages during degradation and stress shielding can occur due to inappropriate selection of elasticity modulus. The medical degradable magnesium alloy interbody fusion cage is made of Mg-Sn-Mn series alloy or Mg-Sn-Mn-Zn series alloy; the medical degradable magnesium alloy interbody fusion cage comprises an upper end plate contact surface (1) and a lower end plate contact surface (2), a through hole (3) is opened at the center of the fusion cage, the upper end plate contact surface (1), the lower end plate contact surface (2) and the through hole (3) are polygons which are of the same shape, two protuberant studs (4) are respectively arranged on the upper end plate contact surface (1) and the lower end plate contact surface (2), and the upper end plate contact surface (1) can be an inclined surface to form an angle theta with the lower end plate contact surface (2). The medical degradable magnesium alloy interbody fusion cage can be applied to the field of degradable and absorptive medical instrument manufacturing.

In a reciprocating device having a moving element, a stator and a flexing suspension for coupling the moving element and stator and for maintaining the moving element on axis, the flexing suspension comprising: at least one flexing element locating the stator relative to the moving element by directly engaging features of the flexing element to mating features of the stator.

The invention provides a safety protection device for a natural gas booster station pipeline for preventing pipeline flange leakage, and relates to the technical field of safety of natural gas pipelines. The safety protection device for the natural gas booster station pipeline comprises a left pipeline and a right pipeline, the left pipeline and the right pipeline are connected through a flange, afirst protective cover is arranged outside the flange in a sleeved mode, and the two ends of the first protective cover are in sealing connection with the outer wall of the left pipeline and the outer wall of the right pipeline respectively to form a first gas storage cavity; and vibration damping devices are arranged between the outer wall of the left pipeline and the inner wall of the first protective cover and between the outer wall of the right pipeline and the inner wall of the first protective cover respectively. The protective device can prolong the service life of a flange connectingpiece, so that the possibility of air leakage between the flanges is reduced, and the safety performance of the booster station pipeline is improved.

A dual-cooled fuel rod's spacer grid with upper and lower dimples, including a blocking area of a flow passage that coolant flows through is reduced and dual-cooled fuel rods are supported, and reduces a turbulent flow of the coolant as well as vibrations of the dual-cooled fuel rods, thereby lessening fretting damage done to the rods. The spacer grid includes a plurality of unit grid straps, each of which includes a body disposed in a vertical direction, an upper dimple protruding from an upper portion of the body, and a lower dimple spaced apart from the upper dimple in a downward direction and protruding from a lower portion of the body. The unit grid straps form a grid structure that have inner grid holes into which the dual-cooled fuel rods are held, and the held dual-cooled fuel rods are each supported in four directions by the upper and lower dimples.

A linker for a unimolecular FRET biosensor based on a principle of fluorescence resonance energy transfer, the linker including: a polypeptide containing 52 to 400 amino acids residues, wherein at least 45% of a total number of the amino acid residues are glycine, alanine, or both thereof, and at least 10% of the total number of the amino acid residues are alanine.

The invention discloses an enhancing porous tantalum implant selective laser preparation method and an implant. The enhancing porous tantalum implant selective laser preparation method comprises the following steps: during the selective laser smelting and forming process, melting spherical tantalum powder under laser radiation, enabling hydride of nano tantalum to decompose hydrogen due to high temperature, and enabling hydrogen to blast and overflow under the action of high temperature and high pressure to form a first-stage porous structure on the surface of formed tantalum; due to a gap existing between an SLM forming melting track and a melting track, forming an included angle of 30-90 degrees between a current-layer melting track and a next-layer melting track to form a second-stage porous structure; and melting and solidifying spherical tantalum powder to form a third-stage porous structure and a fourth-stage porous structure customized by CAD design software. The four stages ofporous structures form cross-stage nanoscale, micro-nanoscale, micrometer scale, millimeter scale and multiple cross-scale macro and microcosmic integrated multi-stage porous tantalum implant. According to the enhancing porous tantalum implant selective laser preparation method, decomposed hydrogen blasts and overflows to generate an enhancing structure to expand the extreme and tiny capacity of SLM forming and enhance the capacity for forming porous tantalum through selective laser melting.

The invention discloses a plate shearing machine tool rest with a locking mechanism and a tool thereof. The plate shearing machine tool rest comprises an upper tool rest module and a lower tool rest module. The upper tool rest module and the lower tool rest module are fixed to a plate shearing machine platform. The upper tool rest module comprises an upper tool rest body, an upper tool body and tool guide rails, the tool guide rails are fixed to the two sides of the upper tool rest body, and the upper tool body is embedded into grooves of the tool guide rails and slides up and down in a fixed stroke. The lower tool rest module comprises a lower tool rest body and a lower tool body, and the lower tool body is fixed to one side of the lower tool rest body. The plate shearing machine tool rest has the beneficial effects that (1) final motion of an upper blade and a lower blade is reduced through the locking mechanism, the eccentric shearing phenomenon is eliminated, twisting of plates is reduced, and the quality of workpieces is improved; and (2) a step-shaped corrugated surface blade is adopted as the upper blade, the rigidity, hardness, abrasion resistance, fatigue strength, toughness and the like of blade steel are greatly improved, burrs and flangings of machined faces are effectively reduced, and the technical performance and production efficiency of a plate shearing machine are improved.

The invention discloses a dental adhesive capable of resisting fretting damages, which consists of powder and liquor, wherein the powder comprises the following components in portion by mass: 90 to 95 portions of zinc oxide, 2 portions of aluminum oxide, and 3 portions of bismuth oxide; the liquor comprises the following components in portion by weight: 74 to 76 portions of orthophosphoric acid, 2 portions of zinc oxide, and 22 to 24 portions of deionized water. The adhesive has volume swelling characteristic in the adhering process, can prevent the fretting damages to a fixed prosthetic body, ensure the long-term stability of the fixed prosthetic body, and prolong the service life of the fixed prosthetic body; besides, the dental adhesive can relieve the pains of patients and lighten the workloads of doctors.

The invention relates to the technical field of hip joint repairing surgery, in particular to a winged eccentric acetabular cup prosthesis. The winged eccentric acetabular cup prosthesis comprises anouter acetabular cup and an inner acetabular cup and is characterized in that the outer acetabular cup has a semispherical outer surface, and the semispherical outer surface of the outer acetabular cup is provided with three wings; the inner acetabular cup is provided with a semispherical inner cavity, and the sphere center of the semispherical inner cavity and the sphere center of the semispherical outer surface are staggered from each other; a plurality of limit mechanisms are evenly distributed at the edge of the inner wall of the outer acetabular cup, and a plurality of positioning mechanisms are evenly distributed at the edge of the outer wall of the inner acetabular cup. The winged eccentric acetabular cup prosthesis has the advantages that acetabular bone defect repairing is prevented from using traditional methods such as padding and bone grafting, the contact interface problem between a pad and an acetabular cup is avoided, the absorption problem of bone grafting is solved, complete contact between a host bone and the surface of the acetabular cup is achieved, the contact area and bone growth area of the prosthesis and the host bone, and the three wings increases the contact area of the acetabular cup and the host bone to a large extent and guarantees the initial stability of the acetabular cup.

The invention discloses a zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateau containing an oxide layer and a preparation method. The preparation method comprises the steps that zirconium-niobium alloy powder serves as a raw material, an intermediate product of the zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateau containing the oxide layer is obtained through 3D printing integral forming, and through hot isostatic pressing and cryogenic oxidation, the zirconium-niobium alloy partitioned bone trabecula uni-compartment tibial plateaucontaining the oxide layer is obtained. A bone trabecula is arranged on the lower surface of a semi-tibial plateau support and the surface of a semi-oval keel with a long round hole, a gradient distribution bone trabecula structure is arranged, micro-motion between a prosthesis and a bone interface can be reduced, the stress shielding effect of the prosthesis on a bone tissue is reduced, so thatthe tibial plateau is uniform in bone tissue stress, the bone ingrowth performance is excellent, and the initial stability and the long-term stability are improved. The bone trabecula is integrally formed through 3D printing, the problem that a complex structure cannot be prepared through traditional machining is solved, the bone trabecula and a solid body are high in bonding strength and not prone to falling off, and the service life of the prosthesis is prolonged.

The invention discloses a novel belt-loop magnesium plate with high strength and corrosion resistance. The surface of the novel belt-loop magnesium plate is covered with a nanocrystal layer, the surface of the nanocrystal layer is covered with a ceramic membrane through a micro-arc oxidation technology, the novel belt-loop magnesium plate is provided with a pull rope hole and a graft hole, the pull rope hole and the graft hole both penetrate through the novel belt-loop magnesium plate, the pull rope hole is used for a pull rope to pass through, and the graft hole is used for a graft to pass through. As the main material of the novel belt-loop magnesium plate is magnesium, magnesium ions of the novel belt-loop magnesium plate can play a role in promoting osteogenesis, so that the formation of callus at the thighbone part is accelerated, the micromotion of a tendon graft in a bone tunnel is slowed down, the widening of the bone tunnel is inhibited, and the reconstruction success rate is improved; and the problems of insufficient mechanical property and poor corrosion resistance of magnesium metal can be solved through the nanocrystal layer and the ceramic membrane, so that the problems of unstable fixation and bone tunnel expansion of an existing tendon graft are practically solved.

A method of designing a fuel nozzle of a gas turbine engine to reduce fretting thereof during use, including establishing an initial nozzle design, determining a first natural frequency of that design and a running frequency range of the gas turbine engine, and increasing a first transverse dimension of the stem member of the nozzle across a length of a portion thereof adjacent the inlet end until the first natural frequency of the nozzle is outside the running range, while a second transverse dimension of the portion remains at least substantially unchanged across the length thereof.

The invention discloses a zirconium-niobium alloy partitioned bone trabecula single-compartment femoral condyle containing an oxide layer and a preparation method. The preparation method comprises thesteps that zirconium-niobium alloy powder serves as a raw material, an intermediate product of the zirconium-niobium alloy partitioned bone trabecula single-compartment femoral condyle containing theoxide layer is obtained through 3D printing integral forming, then the zirconium-niobium alloy partitioned bone trabecula single-compartment femoral condyle containing the oxide layer is obtained through hot isostatic pressing, cryogenic treatment and surface oxidation, the femoral condyle comprises a femoral condyle articular surface and an osseointegration surface, and the osseointegration surface is provided with the bone trabecula in a partitioned manner. Micro-motion of the prosthesis and a bone interface can be reduced, the stress shielding effect of the prosthesis on bone tissue is reduced, the stress of the femoral condyle bone tissue is uniform, and the initial stability and long-term stability of the single-compartment femoral condyle are improved. According to the preparation method, excellent biocompatibility and bone ingrowth of the osseointegration interface and super-strong wear resistance and low wear rate of a friction interface are integrally realized; the femoral condyle bone trabecula has excellent compression resistance; and the compressive yield strength and plasticity of the solid part are enhanced.

The invention discloses a cobalt alloy partitioned bone trabecula single-compartment femoral condyle prosthesis and a preparation method. The preparation method comprises the following steps: by taking cobalt alloy powder as a raw material, performing 3D printing integrated molding to obtain an intermediate product of the cobalt alloy partitioned bone trabecula single-compartment femoral condyle prosthesis, and performing hot isostatic pressing and a deep cooling process to obtain the cobalt alloy partitioned bone trabecula single-compartment femoral condyle prosthesis. The prosthesis comprises a femoral condyle articular surface and an osseointegration surface. Due to the partitioned bone trabecula, micro motion of the prosthesis and a bone interface can be reduced, and the initial stability is achieved; the stress shielding effect of the prosthesis on bone tissues is reduced, the femoral condyle bone tissue stress is uniform, excellent and uniform bone ingrowth performance is achieved, prosthesis looseness caused by osteoporosis after long-term implantation of the prosthesis is avoided, and long-term stability is achieved. Due to 3D printing integrated molding, the bone trabeculaand the entity are high in bonding strength, the bone trabecula does not easily drop, and the service life of the prosthesis is prolonged. The bone trabecula part of the prosthesis has excellent compression resistance; and the entity part releases residual stress, and the plasticity is enhanced.

The invention discloses a preparation method of an integrated acetabular prosthesis. The preparation method of the integrated acetabular prosthesis comprising an outer metal cup and an outer cup lining comprises steps as follows: the outer metal cup is prepared with various machining methods, and the outer cup lining is formed on the outer metal cup with a material additive manufacturing technique. The integrated acetabular prosthesis is formed once, the outer metal cup and the outer cup lining are combined closely, micro-motions are reduced, accordingly, abrasion is reduced, machining procedures are reduced, and the cost is reduced.