80results about How to "Meet a variety of functional needs" patented technology

The invention discloses a method for performing powder material surface modification through plasma. According to powder material surface modification, under a vacuum environment condition, one or more plasma technologies are used for combination to deposit one or more different characteristic materials on the surfaces of powder materials in different types. Meanwhile, one ore more gases can be selected for combination for micro-etching on the surface of powder in different materials according to the plasma appearance. Powder manufactured and processed through the technology is a novel modified powder material with one or more functional characteristics. The modified powder is changed into a single-metal or multiple-metal combined surface from a non-metal surface, vice versa, the metal surface can be modified into a non-metal ceramic surface. Meanwhile, the smooth powder surface can be subjected to micro roughening.

The invention discloses a multifunctional composite material and an application thereof. The multifunctional composite material is in a layer-like structure formed by using a binding agent to carry out hot-press compositing, and comprises an upper outer surface layer, a lower outer surface layer and a middle layer. The multifunctional composite material is characterized in that the upper outer surface layer and the lower outer surface layer are formed by transparent polymers; the middle layer contains at least one layer of textile fabric; art patterns are arranged on at least one surface of the textile fabric; and the binding agent for hot pressing is a non-light-tight polymer. The composite material disclosed by the invention has various functions of high light transmission, art decoration, light weight and convenience, high strength, strong anti-impact capability, screening of electromagnetic radiation, high toughness, isolation of ultraviolet rays and infrared rays and the like, and can be applied to various industries, such as industries of manufacturing a sun-shading and lighting product, a panel for a household appliance, an indoor decorative material, a sports protection product, a safe protection product, a partition wall, abruption, a luggage and the like. The multifunctional composite material is widely applied, can meet various functional requirements on the material in the current society, and has the advantages of practical values, energy conversation and environmental friendliness.

The invention discloses a two-AC and one-DC series-parallel microgrid structure suitable for multi-station integration. The series-parallel microgrid structure is formed by series-parallel connectionof an alternating-current sub-microgrid 1, an alternating-current sub-microgrid 2 and a direct-current sub-microgrid, wherein the alternating-current sub-microgrid 1 is connected with the direct-current sub-microgrid through a power conversion device and a connecting point 1, and the alternating-current sub-microgrid 2 is connected with the direct-current sub-microgrid through a connecting point2; the connecting point 1 and the connecting point 2 are DC / AC conversion devices, the connecting point 2 is a standby power supply point of the connecting point 1, the energy of the connecting point2 can only flow in one direction, and the voltage is rapidly supported for the direct-current sub-microgrid only when the connecting point 1 fails; the alternating-current sub-microgrid 2 comprises aNo.2 energy storage and station transformer, a 400V / 380V isolation transformer, an energy storage battery and an AC / DC conversion device; the NO.2 energy storage and station transformer is connectedwith an external network, the 400V / 380V isolation transformer and the AC / DC conversion device, and the AC / DC conversion device is connected with the energy storage battery. The series-parallel microgrid structure is high in reliability, wide in coverage, high in fusion degree and excellent in economy.

The invention relates to a polytetrafluoroethylene fiber tubular film, which comprises a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous, the diameter of the fiber is more than 200 nm and is less than or equal to 2000 nm, the polytetrafluoroethylene material body has pore cavities with a pore size of 10-2000 nm and cavity walls formed by surrounding the pore cavities in a three-dimensional space manner, the pore cavities are uniformly distributed and are communicated in a three-dimensional manner, various pore cavities present the uniform distribution on the porous material under any unit-scale volumes, and the porosity is more than or equal to 65%. According to the present invention, the uniform pore cavity distribution mode of the polytetrafluoroethylene fiber tubular film can be concretely and clearly measured, wherein the pore distribution uniformity of the porous material and the multi-level structure thereof are measured by using the small unit-scale volumes, such that the porous structure is highly uniform so as to ensure the uniformity of various performances of the porous material.

The invention discloses a porous material and a preparation method thereof. The material comprises a material body, wherein the material body comprises pore cavities graded according to the material pore size and cavity walls enclosing to form the pore cavities, the cavity wall encloses to form the upper-level cavity in a three-dimensional space manner while is provided with the lower-level pore cavity, and various levels of the pore cavities are respectively communicated to each other and penetrate through each other. The preparation method comprises: mixing raw material powder and a pore forming agent for preparing the smallest-level pore cavity of a porous material to prepare a slurry, uniformly filling the slurry into a polymer material stent to form a billet, drying, breaking to obtain mixed particles, uniformly mixing the mixed particles and a pore forming agent for preparing the upper-level pore cavity more than the smallest-level pore cavity of the porous material to form a compact billet, carrying out vacuum sintering, and carrying out routine subsequent treatment according to the raw material process of the porous material. According to the present invention, the porous material has characteristics of good penetrating property and uniform performance, each level of the porous material has the own physical and chemical properties, a variety of function requirements can be met, the obtained porous material can be used as the biological material, the separation material and other materials, and the preparation method is simple and easy to achieve.

The invention discloses a three-phase AC motor virtual-simulation experiment system and experiment method of hardware-in-loop. The security of the system can be improved, the development cost is greatly reduced, and an effect same as an actual motor verification platform can be acquired, and the development cycle is shortened. The system comprises an upper computer with a human-machine interactioninterface and a power conversion unit, and further comprises a control panel and a model panel; the upper computer is connected with the model panel and the control panel through USB interfaces, thecontrol panel and the model panel are connected through a Spi interface, the control panel is connected with the power conversion unit, and the three-phase AC output by the power conversion unit is used for supplying power for the motor; the control panel produces an analog voltage signal and a PWM signal so that the model panel can simulate different motor states and controlling on-off states ofthe power conversion unit; the power conversion unit is connected with a voltage-current transformer and a rotary encoder on the motor so as to collect the voltage-current and rotating speed data of the motor.

The invention discloses an all-altitude adjustment electric wheelchair which comprises a main frame. A support mechanism is fixed onto the main frame and comprises a seat plate, a foot supporting plate and a backrest plate, and electric push rods for adjusting positional relations are respectively fixed to positions between the seat plate and the foot supporting plate and between the seat plate and the backrest plate; a seat plate altitude adjusting mechanism for adjusting the position of the seat plate is arranged between the main frame and the seat plate, and the position of the seat plate can be adjusted, kept or dynamically adjusted by the seat plate altitude adjusting mechanism, so that all altitudes of the electric wheelchair can be adjusted. The all-altitude adjustment electric wheelchair has the advantages that the expansion amounts of the electric push rods can be controlled according to schemes set by users or programs, accordingly, the optional altitudes can be adjusted and fixed, and requirements of the users can be met; the most comfortable altitudes can be selected by the users according to characteristics of the different users, and the all-altitude adjustment electric wheelchair further can assist the users to carry out auxiliary rehabilitation training; swinging of rocking chairs can be simulated, accordingly, different types of service experience can be provided for the users, diversified functional requirements of the users can be met, and user groups of the electric wheelchair can be expanded.

The invention relates to a multi-function low-power-consumption agricultural tractor, which comprises an engine, a transmission case, a cab assembly, a cargo tank assembly, a rear axle assembly, a suspension assembly, double top hydraulic cylinders, a side beam type / stamped and riveted structure large beam assembly, a fuel tank, a battery, and a front axle assembly. The invention has the beneficial effects that the QC2110 engine is adopted, the power demand can be satisfied, and the power can be saved to the largest extent; the 130 transmission case and the 130 enhanced rear axle are adopted, the fuel consumption can be reduced, the bearing capacity is higher and can be matched with the power of the engine; the two top hydraulic devices are arranged on a chassis, a rotary cultivator can be installed on the chassis for agricultural farming operations in agricultural peak seasons, the cargo tank can be installed on the chassis for transportation in slack seasons, and multiple functional needs can be met; the side plates and the rear plate of the cargo tank are hinged instead of welding, the dead paint angles of the welded carriage can be eliminated, the flow of liquid rust can be avoided, and the loading, unloading and transportation of goods can be facilitated.

The invention provides a polytetrafluoroethylene fiber membrane. The polytetrafluoroethylene fiber membrane comprises a polytetrafluoroethylene material body; the polytetrafluoroethylene is fiber-shaped and the fiber diameter is 30 to 200 nm; the body is provided with pore cavities with the pore diameters of 10 to 1000 nm, and a cavity wall which is formed by surrounding the pore cavities in the three-dimensional space; the pore cavities are distributed uniformly; each pore cavity runs through in a three-dimensional mode; and the pore cavity uniform distribution means that each pore cavity is uniformly distributed on a porous material and under any unit level volume, the porosity is more than or equal to 65 percent and the light transmittance is more than or equal to 45 percent. A specific and clear measurement mode is provided for the pore cavity uniform distribution of the polytetrafluoroethylene fiber membrane, and the porous material and the pore distribution uniformity of the multi-level structure are measured under the dimension of the small unit level volume, and the porous structure is highly uniform, so that the uniform consistency of each property of the porous material is guaranteed.

The invention provides a polytetrafluoroethylene hollow fiber membrane which comprises a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous with the fiber diameter of 30-200nm; the body has pore cavities with the pore size of 10-1000nm and cavity walls formed around the pore cavities in the three-dimensional space, and the pore cavities are uniformly distributed and are respectively perforated in the three-dimensional space; and the uniform distribution of the pore cavities refers to uniform distribution of the pore cavities in the porous material in any unit level of volume. The porosity is 70% or above, the light transmittance is 50% or above, the tensile strength is 20 N / mm<2> or above, and the water pressure resistance is 4kg / cm<2> or above. The invention provides a specific and definite measurement mode for uniform distribution of pore cavities of the polytetrafluoroethylene hollow fiber membrane, and determines that the pore distribution uniformity of the porous material and multilevel structure thereof is measured by the small unit level of volume, so the porous structure is highly uniform, thereby ensuring the uniformity of various properties of the porous material.

The invention provides an evaporative cooling heat pump assembly. The other end of an evaporative cooling heat exchange unit communicates with a liquid accumulator through a third electromagnetic valve. The liquid accumulator is connected with a first expansion valve, wherein the first expansion valve is connected with the other end of indoor heat exchange through a fourth electromagnetic valve and a second electromagnetic valve. A first connector A communicates with a connecting pipeline between the other end of the evaporative cooling heat exchange unit and a third electromagnetic valve through a first electromagnetic valve, a first one-way valve and a fifth electromagnetic valve. The connecting pipeline between the other end of the evaporative cooling heat exchange unit and the third electromagnetic valve communicates with the connecting pipeline between the fourth electromagnetic valve and the second electromagnetic valve through a ninth electromagnetic valve. The first expansion valve communicates with the connecting pipeline between the first one-way valve and the fifth electromagnetic valve through a second one-way valve. The second one-way valve communicates with the connecting pipeline between the liquid accumulator and the third electromagnetic valve through a sixth electromagnetic valve. The connecting pipeline between the liquid accumulator and the third electromagnetic valve communicates with the connecting pipeline between the fourth electromagnetic valve and the second electromagnetic valve through a tenth electromagnetic valve. The evaporative cooling heat pump assembly is convenient to use, and the cost is reduced.

The invention provides a superfine polytetrafluoroethylene fiber pipe type membrane which comprises a polytetrafluoroethylene material body, wherein polytetrafluoroethylene takes the shape of fiber; the diameter of the fiber is 30-200 nm; the polytetrafluoroethylene material body is provided with pore cavities of which the apertures are 10-1000 nm and cavity walls formed by three-dimensional spaces surrounding the pore cavities; the pore cavities are uniformly distributed; the pore cavities are communicated in a three-dimensional manner; the pore cavities are in uniform distribution means that the pore cavities are in uniform distribution in a porous material by any unit-grade volume; the porosity is greater than or equal to 75%; the tensile strength is 15 N / mm<2> or higher; and the water-pressure resistance is 3 kg / cm<2> or higher. A specific and definite measurement mode is provided for on pore cavity distribution uniformity of the polytetrafluoroethylene fiber pipe type membrane, the pore distribution uniformity of the porous material and a multi-stage porous material of the porous material is measured by small-unit grade volume, the porous structure is high in uniformity, and thus uniformity consistency of different properties of the porous material can be ensured.

The invention provides a neodymium iron boron permanent magnet with a corrosion preventing and abrasion resisting clad layer and a preparing method of the neodymium iron boron permanent magnet. According to the preparing method, the magnetic performance of the neodymium iron boron permanent magnet is not damaged, and in addition, the neodymium iron boron permanent magnet corrosion preventing and abrasion resisting clad layer high in binding force, good in corrosion resisting effect and resistant to abrasion is prepared on the surface of the permanent magnet. The preparing method comprises thefollowing steps that coating pretreatment is conducted on the neodymium iron boron permanent magnet, and a fresh surface shows from the permanent magnet; the neodymium iron boron permanent magnet is moved into a vacuum coating machine vacuum coating chamber, and the magnetron sputtering technology is adopted for sequentially depositing a combining layer, an inner protection layer and an outer protection layer on the surface of the neodymium iron boron permanent magnet at the temperature of 150 DEG C or below. Through the composite film layer structure design, corrosion resistance performance and abrasion resistance performance coexist, it is guaranteed that a film layer is still effective when local abrasion happens to a surface-layer film, and it is ensured that the magnet can still normally work under the extreme work condition.

The present invention relates to a multi-level pore material, which comprises a multi-level porous material, and comprises a material body, wherein the material body comprises pore cavities graded according to the material pore size and cavity walls enclosing to form the pore cavities, and the pore cavities present the uniform distribution. The multi-level pore material is characterized in that the cavity wall encloses to form the upper-level cavity in a three-dimensional space manner while is provided with the lower-level pore cavity, various levels of the pore cavities are respectively communicated to each other and penetrate through each other, and the uniform distribution of the pore cavities is that the uniform distribution is presented under any unit-level volume on the multi-level pore material. According to the present invention, the grading structure form of the pore cavities of the material can meet a variety of function requirements; and the pore distribution uniformity of the multi-level pore material is measured in the small unit-level volume scale, such that the multi-level pore material is highly uniform so as to ensure the uniformity of the multiple performances of the multi-level pore material.

The invention relates to a hip joint replacement prosthesis. The hip joint replacement prosthesis comprises a femoral stem (1) and a femoral neck (2). The hip joint replacement prosthesis is characterized in that the tail end of the lower part of the femoral neck (2) is formed by two parts, one part is an elastic barb (4) and the other part is a cylindrical object (5), and an interval gap (6) is arranged between the elastic barb (4) and the cylindrical object (5). The head of the femoral stem (1) is internally provided with an L-shaped hole (7). The lower part of the femoral neck (2) is plugged in the L-shaped hole (7), and the elastic barb (4) is hooked and clamped in a horizontal hole (9) of the L-shaped hole (7). The surface of the lower part of the femoral stem (1) is attached with raised edges (11) made of a hierarchical porous material. The hip joint replacement prosthesis is reasonable in structure design, and has relatively high connection stability and biocompatibility after being implanted.

The invention relates to an artificial shoulder joint prosthesis. The artificial shoulder joint prosthesis comprises a humeral head (1) and a humeral handle (2), and is characterized in that a round hole (3) is arranged at the upper part of the humeral handle (2), wherein the lower handle body of the humeral handle (2) is composed of a body (4) and a coating layer (5) arranged at the outer layer of the body (4), and the coating layer (5) is made of a multi-level-hole material; through holes (6) are arranged in the handle body. The artificial shoulder joint prosthesis is reasonable in structural design, the selected materials are suitable and controllable and are uniform in height, after being implanted into the human body, the artificial shoulder joint prosthesis is high in connection stability and biocompatibility, and thus the postoperative quick recovery is facilitated.

The invention provides a polytetrafluoroethylene ultrafine fiber tubular membrane which comprises a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous with the fiber diameter of 30-200nm; the body has pore cavities with the pore size of 10-1000nm and cavity walls formed around the pore cavities in the three-dimensional space, and the pore cavities are uniformly distributed and are respectively perforated in the three-dimensional space; and the uniform distribution of the pore cavities refers to uniform distribution of the pore cavities in the porous material in any unit level of volume. The porosity is greater than or equal to 70%. The invention provides a specific and definite measurement mode for uniform distribution of pore cavities of the polytetrafluoroethylene fiber tubular membrane, and determines that the pore distribution uniformity of the porous material and multilevel structure thereof is measured by the small unit level of volume, so the porous structure is highly uniform, thereby ensuring the uniformity of various properties of the porous material.

The invention provides a superfine polytetrafluoroethylene fiber pipe type membrane which comprises a polytetrafluoroethylene material body, wherein polytetrafluoroethylene takes the shape of fiber; the diameter of the fiber is 30-200 nm; the polytetrafluoroethylene material body is provided with pore cavities of which the apertures are 10-1000 nm and cavity walls formed by three-dimensional spaces surrounding the pore cavities; the pore cavities are in uniform distribution; the pore cavities are communicated in a three-dimensional manner; the pore cavities are in uniform distribution means that the pore cavities are in uniform distribution in a porous material by any unit-grade volume; the porosity is 65% or higher; and the light transmittance is 45% or higher. A specific and definite measurement mode is provided for pore cavity distribution uniformity of the polytetrafluoroethylene fiber pipe type membrane, the pore distribution uniformity of the porous material and a multi-stage porous structure of the porous material is measured by small-unit grade volume, the porous structure is high in uniformity, and thus uniformity consistency of different properties of the porous material can be ensured.

The invention provides a polytetrafluoroethylene hollow fiber membrane. The hollow fiber membrane is prepared from a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous, and the fiber diameter is more than 200nm and less than or equal to 2000nm; the body is provided with pore cavities having a pore diameter of 10-2000nm and a cavity wall which encloses the pore cavity in a three-dimensional way; the pore cavities are uniformly distributed under an arbitrary unit-level volume on a porous material, and penetrated in a three-dimensional manner; and the porosity is 65 percent or over, and light transmittance is 45 percent or over. According to the polytetrafluoroethylene hollow fiber membrane, a specific and definite measurement mode is provided to uniform pore cavity distribution, a porous material and the pore distribution uniformity of the multi-stage structure of the porous material are measured by the scale of small-unit volume, so that the porous structure is highly uniform, and the uniformity of each performance of the porous material is ensured.

The invention relates to a buffer hip joint. The hip joint comprises a femoral stem (1) and a femoral neck (2). The hip joint is characterized in that the femoral stem (1) is divided in two parts of a near end (3) and a far end (4). The heat of the near end (3) is internally provided with an L-shaped hole (5). The lower part of the femoral neck (2) is plugged in the L-shaped hole (5). The lower part of the near end (3) is provided with an inner hole (6), and the inner hole (6) is internally provided with a step surface (7). The far end (4) is made of a hierarchical porous material. The head of the far end (4) is added with a connecting rod (8). The end of the connecting rod (8) is provided with an elastic barb (9). The connecting rod (8) is plugged in the inner hole (6), and the elastic barb (9) is hooked and clamped in the step surface (7) of the inner hole (6). The inner hole (6) is longer than the connecting rod (8). The hip joint is reasonable in structural design, and connection stability and biocompatibility are relatively high, and post-surgery healing effect is better and faster.

The invention provides a polytetrafluoroethylene fiber membrane. The polytetrafluoroethylene fiber membrane comprises a polytetrafluoroethylene material main body. Polytetrafluoroethylene is in a form of fibers, the fiber diameter is in a range of 30-200 nm, the main body has hole cavities having hole diameters of 10-1000 nm and cavity walls formed from 3D spaces around the hole cavities, the hole cavities are uniformly distributed in the porous material in any unit volume and are communicated in a way of 3D communication, porosity is 70% or more, light transmittance is 50% or more, tensile strength is 20 N / mm<2> or more and water pressure resistance of 4 kg / cm<2> or more. The technical scheme provides a clear measurement method of uniform distribution of hole cavities of the polytetrafluoroethylene fiber membrane and realizes measurement of the porous material in a small unit volume scale and hole distribution uniformity of the multi-grade structure. The porous structure is highly uniform and ensures uniformity consistency of performances of the porous material.

The invention relates to a biological type hip joint. The hip joint comprises a femoral stem (1) and a femoral neck (2). The hip joint is characterized in that the lower part of the femoral neck (2) is provided with a barb (4), the upper part of the femoral stem (1) is provided with an L-shaped hole (7), and an installing hole (8) communicated with a longitudinal hole in the L-shaped hole (7). The lower part of the femoral neck (2) is inserted into the L-shaped hole (7). The barb (4) is hooked and clamped in a horizontal hole in the L-shaped hole (7). The installing hole (8) is internally provided with a spring (3). One end of the spring (3) is abutted against the lower part of the femoral neck (2), and the outer side of the other end is provided with a screw rod (9) which is connected in the installing hole (8). The femoral stem (1) is provided with a filling interlayer (10) which passes through two sides of a stem body, and a hole (11) passing through the stem body and communicated with the filling interlayer (10). The filling interlayer (10) is made of a hierarchical porous material. The hip joint has relatively high connection stability and biocompatibility, and post-surgery healing effect is better.

The invention provides a polytetrafluoroethylene hollow fiber membrane which comprises a polytetrafluoroethylene material body, wherein polytetrafluoroethylene takes the shape of fiber; the diameter of the fiber is greater than 200 nm and less than or equal to 2000 nm; the polytetrafluoroethylene material body is provided with pore cavities of which the apertures are 10-2000 nm and cavity walls formed by three-dimensional spaces surrounding the pore cavities; the pore cavities are in uniform distribution; the pore cavities are communicated in a three-dimensional manner; the pore cavities are in uniform distribution means that the pore cavities are in uniform distribution in a porous material by any unit-grade volume; and the porosity is greater than or equal to 65%. A specific and definite measurement mode is provided for pore cavity distribution uniformity of the polytetrafluoroethylene hollow fiber membrane, the pore distribution uniformity of the porous material and a multi-stage porous structure of the porous materials is measured by small-unit grade volume, the porous structure is high in uniformity, and thus uniformity consistency of different properties of the porous material can be ensured.

The invention relates to a shoulder joint prosthesis. The shoulder joint prosthesis comprises a humeral head (1) and a humeral stem (2). The shoulder joint prosthesis is characterized in that the humeral head (1) is of a hemispherical structure, and an inserting rod (3) is fixed to the end face of the humeral head; a through hole (4) is formed in the inserting hole (3); an inserting hole (5), which goes through in an oblique direction, is formed in the head part of the humeral stem (2); the inserting rod (3) is inserted into the inserting hole (5), and the part, where the through hole (4) is formed, of the inserting rod (3) extends out of the inserting hole (5); a nail (6) is matched in the through hole (4); a stem body of the humeral stem (2) is made from a multi-stage porous material; and arc-shaped grooves (7) are formed in the stem body. The shoulder joint prosthesis provided by the invention is simple and convenient in structural design, relatively high in overall connectivity and biocompatibility and is conducive to rapid recovery after operations.

The invention relates to a double-lens video camera. The video camera comprises a video camera circuit which is arranged in a video camera shell and two lenses which are connected with the video camera circuit and connected with a digital signal processor (DSP) coder-decoder through a charge coupled device (CCD) in the video camera circuit respectively. The video camera is characterized in that: a mobile phone lens or a camera lens capable of shooting the facial expression of a user behind a video camera body is arranged based on the original video camera function and pictures shot by the two lenses are combined in a certain way or stored as independent images, so that the function of the video camera is increased, a shot image is more artistic and vivid and various functional requirements of customers are met.

The invention relates to a bionic acetabular prosthesis. The bionic acetabular prosthesis comprises an acetabular cup (1) and a liner (2), and is characterized in that a clamping groove (4) is arranged in the inner surface of the rim of the acetabular cup (1), a spring clamping ring (3) is increased in the clamping groove (4), the liner (2) is placed in the acetabular cup (1), and the rim of the liner (2) pushes against the lower surface of the spring clamping ring (3); and the acetabular cup (1) is made of a hierarchical porous material. The bionic acetabular prosthesis is stable in structural connection and convenient to mount, and has relatively high biocompatibility.

The invention relates to a shoulder joint prosthesis. The shoulder joint prosthesis comprises a humeral head (1) and a humeral stem (2). The shoulder joint prosthesis is characterized in that the humeral head (1) is of a hemispherical structure, and an inserting rod (3) is fixed to the end face of the humeral head; a through hole (4) is formed in the inserting hole (3); an inserting hole (5), which goes through in an oblique direction, is formed in the head part of the humeral stem (2); the inserting rod (3) is inserted into the inserting hole (5), and the part, where the through hole (4) is formed, of the inserting rod (3) extends out of the inserting hole (5); a nail (6) is matched in the through hole (4); a stem body of the humeral stem (2) is made from a multi-stage porous material; and arc-shaped grooves (7) are formed in the stem body. The shoulder joint prosthesis provided by the invention is simple and convenient in structural design, relatively high in overall connectivity and biocompatibility and is conducive to rapid recovery after operations.

The invention provides a polytetrafluoroethylene ultrafine fiber membrane which comprises a polytetrafluoroethylene material body, wherein the polytetrafluoroethylene is fibrous with the fiber diameter of 30-200nm; the body has pore cavities with the pore size of 10-1000nm and cavity walls formed around the pore cavities in the three-dimensional space, and the pore cavities are uniformly distributed and are respectively perforated in the three-dimensional space; and the uniform distribution of the pore cavities refers to uniform distribution of the pore cavities in the porous material in any unit level of volume. The porosity is greater than or equal to 75%, the tensile strength is 15 N / mm<2> or above, and the water pressure resistance is 3kg / cm<2> or above. The invention provides a specific and definite measurement mode for uniform distribution of pore cavities of the polytetrafluoroethylene fiber membrane, and determines that the pore distribution uniformity of the porous material and multilevel structure thereof is measured by the small unit level of volume, so the porous structure is highly uniform, thereby ensuring the uniformity of various properties of the porous material.