314 results about "Fusiform shape" patented technology

The invention relates to an extraction method of sargassum fusiform active polysaccharide, which uses four-step extraction method as combined ultrasonic extraction, water extraction, alkali extraction, hot water extraction and ultrasonic technique, thereby improving sargassum fusiform polysaccharide extraction rate and avoiding damage on sargassum fusiform activity in polysaccharide extraction. Besides adding the character of polysaccharide on extract, the prepared sargassum fusiform active polysaccharide has high oxidation resistance, which is suitable for cosmetic technical field. In addition, the prepared sargassum fusiform polysaccharide uses active carbon adsorption and AB-8 macroporous adsorption resin to combine decolor and de-fishy, thereby resolving the key techniques as decolor and de-fishy of sea phaeophyceae polysaccharide as sargassum fusiform or the like, to improve polysaccharide purity, appearance quality and confirm the high oxidation resistance of de-fishy and decolor polysaccharide.

The invention provides an oil-water separation fiber membrane with an excellent anti-pollution capability and a preparation method thereof and belongs to the technical field of new materials. Polyacrylonitrile and graphene oxide are used as preparation raw materials and a hydrolyzed polyacrylonitrile and graphene oxide compound fiber membrane is prepared through an electrostatic spinning technology and an alkali treatment method. Fibers of the fiber membrane have a lot of fusiform nodes and the nodes are induced through the graphene oxide. Furthermore, the fiber membrane is subjected to alkali treatment so that the hydrophility of the membrane is improved. Dual regulation and control on shape and surface hydrophility of the fiber membraneare carried out so that oil-water latex separation efficiency and anti-pollution performance of the membrane are remarkably improved. The preparation method of the separation membrane is simple and feasible and is safe and environmentally friendly; and the oil-water separation fiber membrane has very good application value and market prospect in the aspect of oil-containing wastewater treatment.

The invention provides a method for preparing a fusiform complicated organ precursor by using a rotary assembling die, which comprises the following steps of: firstly, preparing a cellular matrix solution and a synthetic macromolecular solution, assembling the assembling die with a multilevel branching internal die, pouring the cellular matrix solution between an internal ring die and a base die, rotating the base die and carrying out physical or chemical cross-linking or polymerization to obtain a cellular matrix layer; secondly, pouring the synthetic macromolecular solution between the cellular matrix layer and an external ring die, rotating and extracting the base die with a cellular culture solution or PBS (Phosphate Buffer Solution) to form an outer support, removing the assembling die to obtain a semi-fusiform three-dimensional structure with multiple branching channels containing different cells and synthetic macromolecule supports, and permeably adhering and mixing the two semi-spindles through either natural or synthetic macromolecular solution to form the complete fusiform complicated organ precursor with the internal branching pipe. The method for preparing the fusiform complicated organ precursor by using the rotary assembling die overcomes the defects that the existing cells are difficult to penetrate into the three-dimensional supports and the supports containing multiple cells are unlikely to form and the like.

An implement handle graspable by a hand of an intended user and connectable to an implement head includes a generally elongated body defining a body longitudinal axis, a body forward end for connection to the implement head and a longitudinally opposed body rearward end. The body also defines a body top surface and a substantially opposed body bottom surface. The body is configured so as to define a longitudinal cross-sectional configuration having a substantially fusiform encirclable section tapering rearwards towards the body rearward end and forwardly towards a neck section. The neck section diverges forwardly into an abutment section. The neck and abutment sections together define a thump rest area on the body top surface and an index rest area on the body bottom surface. The abutment section tapers forwardly into a spacing section for spacing the fingers of the intended user from the implement head.

The invention relates to an air conditioner air-out structure. The air conditioner air-out structure comprises a shell forming an air channel; a fusiform flow separating structure is arranged at the front end of the air channel; the air channel is divided into an upper air channel and a lower air channel by the flow separating structure; an air-in cavity is formed in the rear end of the air channel; the front end of the air-in cavity is connected with the upper air channel and the lower air channel; the air-in cavity is provided with an air door used for shielding the air-in cavity; the rear end of the air-in cavity is connected with an air outlet opening of an air conditioner; an air direction adjuster is arranged on the side, close to the air-in cavity, of the flow separating structure;and when the air direction adjuster swings, the upper air channel or the lower air channel is shielded. The air conditioner air-out structure is simple in structure and occupies a small area, and canconveniently achieve up-and-down adjusting of the air-out direction and air volume adjusting of the air conditioner.

The invention relates to a preparation method of a fusiform nanometer powder of alpha-Fe2O3. A water or solvent thermal synthesis is used for respectively dissolving an original reaction material, ferric nitrate and a mineralizer, potassium hydroxide into a mixed solvent which is composed of ethylene glycol and water; then a potassium hydroxide solution is added drop by drop into a ferric nitrate solution to get a suspension liquid precursor which is used for the water or solvent thermal reaction; the suspension liquid precursor is sealed into a reactor and is processed by heat treatment for 4 hours to 36 hours at the temperature of 160 DEG C to 240 DEG C to get the fusiform nanometer powder of alpha-Fe2O3; the length of the kernel is not less than 200 nanometers and the largest diameter is not less than 100 nanometers. The products of the invention have the advantages of stable quality, high purity, good particle dispersion and excellent catalyzing property; the preparation process is simple and easy to control, has the advantages of no pollution and low cost and is easy for mass production.

An implement handle graspable by a hand of an intended user and connectable to an implement head includes a generally elongated body defining a body longitudinal axis, a body forward end for connection to the implement head and a longitudinally opposed body rearward end. The body also defines a body top surface and a substantially opposed body bottom surface. The body is configured so as to define a longitudinal cross-sectional configuration having a substantially fusiform encirclable section tapering rearwards towards the body rearward end and forwardly towards a neck section. The neck section diverges forwardly into an abutment section. The neck and abutment sections together define a thump rest area on the body top surface and an index rest area on the body bottom surface. The abutment section tapers forwardly into a spacing section for spacing the fingers of the intended user from the implement head.

The invention relates to an artificial antibody type titanium dioxide (TiO2) / boron-doped diamond (BDD) membrane electrode and a preparation method thereof, the electrode is in p-n heterostructure, the electrode uses boron-doped diamond (BDD) as a substrate, uniform dense fusiform TiO2 particles are on the surface of the BDD, the particle size of the TiO2 particles is 50-100nm, a modification layer with a thickness of 5 to 10 mum is formed by the densely covered TiO2 particles; the preparation method of the artificial antibody type titanium dioxide (TiO2) / boron-doped diamond (BDD) membrane electrode is as follows: using of the boron-doped diamond as the substrate, low temperature liquid phase deposition of TiO2 with a target pollutant molecular imprinting on the surface of the substrate, and removal of target pollutant molecules. Compared with the prior art, the artificial antibody type titanium dioxide (TiO2) / boron-doped diamond (BDD) membrane electrode prepared by the method both has the p-n heterostructure and target pollutant molecular recognition ability, has excellent photoelectrocatalytic integrative performance and high selectivity degradation ability, has the advantages of simple preparation process, can be effectively used for removal of organic pollutants with low concentration, low tendency to biochemistry and high toxicity, and has extensive economic and social benefits.

The invention discloses a high quality and high yield high density cultivation method for peaches. The method comprises the following steps: (1) orchard site selection and greenhouse construction; (2) species selection and nursery stock fixed planting; (3) tree form cultivation; (4) flowering phase management; (5) trimming after fruit picking; (6) intermediate cutting; (7) soil, fertilizer and water management; and (8) prevention and control of diseases and pests. The high quality and high yield high density cultivation method for peaches disclosed by the invention adopts a winter heating type greenhouse cultivation method with high density cultivation, fusiform trimming and scientific management, makes full use of sunlight to carry out photosynthesis, and combines soil to provide sufficient nutrients to peach trees, so that the purpose of planting in spring and fruiting in winter is achieved, and the fruit setting rate is high and the output is high; the applied fertilizer is an organic fertilizer which is rich in organic matters and further contains various amino acids and trace elements, and can efficiently condition the soil structure, activate soil and improve the disease resistance of grapes.

The invention relates to an ophthalmic medical appliance and a manufacture method of the ophthalmic medical appliance, in particularly to a biomembrane material strip belt for a high-myopia posterior scleral reinforcement surgery. Base materials of the biomembrane material strip belt have a wide resource, the biomembrane material strip belt is blue after the treatment, the manufactured blue biomembrane material strip belt has good visuality and cannot easily get lost in the implantation process; the hardness and the elasticity are proper, the adaptability is good, the implantation is easy, and the biomembrane material strip belt is easily pasted, sewed and fixed with a receptor sclera; after the implantation into the human body, the toxicity is low, the mechanical strength is high, the tissue compatibility is good, the degradation resistance capability is high, and the calcification is not easy to occur; and the whole body of the biomembrane material strip belt is in a fusiform shape, the thickness is 0.15 to 0.45mm, the side part is an inclined surface, the middle section is widest, the middle section is gradually narrowed in arc-shaped transition respectively towards the left end and the right end, the length is 30 to 60mm, the width of the middle section is 10 to 16mm, the width of the left and the right end is 2 to 3mm, through the special shape design of the strip belt, the venae vorticosae can be prevented from being pressed, the reinforcement range is enlarged, the inclined surface of the side part is in 30 to 45 degrees, the marking at the positive surface and the opposite surface is realized, and the twisting turning is not easy to cause during the implantation.

The invention discloses a wing folding mechanism of a morphing aircraft, and belongs to the field of aircraft wing mechanisms. The problems that an existing wing folding mechanism is only used for ground folding, and a gap is formed between an inner wing section and an outer wing section in the folding process are solved. An inner side reinforcing rib is fixedly arranged on a wing beam of the inner wing section, an outer side reinforcing rib is fixedly arranged on a wing beam of the outer wing section, a rotary actuator is located between the inner side reinforcing rib and the outer side reinforcing rib, a fusiform fairing is composed of a fairing body and a sealing ring, and an inner side lug, the rotary actuator and the outer side lug are sealed inside the fusiform fairing. The connection end of the fairing body is connected to an outer frame of the inner side reinforcing rib in a sleeving mode, and the connection end of the sealing ring is connected to an outer frame of the outer side reinforcing rib in a sleeving mode. The wing mechanism is foldable.

The invention discloses a preparation method of a nitrogen-doped porous carbon rod capacitance desalting electrode and belongs to the field of capacitance desalting electrode preparation. According to the preparation method, firstly, a metal organic frame MIL-88-NH2 is synthesized through a hydrothermal reaction, and washing, drying, high temperature annealing and etching with acid liquor are conducted to obtain highly-graphitized nitrogen-doped porous carbon which is in a fusiform rod shape and has a wide pore diameter; the prepared nitrogen-doped porous carbon rod, acetylene black and polyvinyl alcohol are mixed to be uniform, graphite paper is coated with the mixture, drying is conducted, and the capacitance desalting electrode is obtained. The preparation method has the advantages that the metal organic frame is used for preparing the highly-graphitized nitrogen-doped porous carbon material which is of a fusiform rod structure and has the wide pore diameter for a precursor; the specific surface area, the degree of graphitization and the nitrogen doping content of the prepared fusiform porous carbon rod can be controlled by controlling temperature; the preparation process is simple and easy to conduct, conditions are mild, and the preparation method can be used for large-scale production.

The invention discloses a summering cultivation method for seedlings of Hizikia fusiform (Harv)Okamura juvenile sporophytes, comprising the following steps: raising seedlings in a north sea area at a high latitude during the high temperature stage; and transferring the cultivated seedlings to a south cultivation sea area at a low latitude after summering for cultivation. In the invention, seedling raising and cultivation are performed in different levels and sea areas, thus overcoming the disadvantageous sea conditions in cultivation sea areas, and avoiding high energy consumption in an indoor temperature-reduction cultivation mode.

A multifunctional nanometer composite thin film, its production and use are disclosed. The thin film contains silicone, it is grafted with perfluoro-silicane 0.02í½0.1wt% on surface and doped with nanometer iron oxide particle 1í½4wt% in network, which is fusiform or needle alpha-FeOOH, beta-FeOOH, alpha-Fe2O3 or gamma-Fe2O3. The process is carried out by hydrolyzing for silane coupling agent and ethyl orthosilicate in water, alcohol and hydrolytic catalyst system, mixing, adding into alcohol, condensing and generating silicone polymer at 30í½60íÒC, adding into nanometer iron oxide particle and fluorosurfactant, reacting, obtaining thin-film sol, forming thin-film sol into film on treated substrate material, drying and curing. It achieves higher anti-aging and mechanical performances.

The present invention relates to a single-time automatic forming method of the electric motor coil and the special hardware. The characteristics of the method reside in that the motions of stretching the edge of the coil to be extended, driving up the end part of the coil and distorting the coil edge and the nose part, and the forming of involute of the end part and the circular arc at each bended part are all included in the coil extending steps. The characteristics of the device reside in that: the mechanical part includes a base frame, a combination of top-left mechanical arm and the mechanical hand, a combination of bottom-left mechanical arm and the mechanical hand, a combination of top-right mechanical arm and the mechanical hand, a combination of bottom-right mechanical arm and the mechanical hand, a combination of a moveable frame on the left end part and a clamp of the nose part, a combination of a moveable frame on the right end part and a clamp of the nose part, and each part is drove and controlled through the corresponding AC servodrive module, AC servodrive electric motor, and a logic controller. The single-time, accurate, quick and stable forming of the electric motor fusiform coil is realized through a reasonable design of the program behavior. And a high-efficient, stable, and single-time forming can be achieved by the device in the present invention.

The invention discloses a composite microbial preparation for purifying water and a preparation method thereof. The preparation method is characterized by comprising the following steps of: respectively carrying out single-strain culture on bacillus licheniformis, bacillus subtilis, bacillus circulans, xanthan-degrading bacteria and fusiform bacillus to obtain seed culture solutions; inoculating into a same culture medium; then carrying out seed tank fermentation and fermentation tank fermentation culture to obtain the product preparation, wherein the microbial contents of five strains contained in the product preparation are all more than and equal to 1.0*10<9> cfu / ml. According to the preparation method, the strains sufficiently grow, and therefore, the effectiveness of the strains is not reduced and a culture period is also greatly shortened; after a polluted water body is added, the strains respectively perform own functions and cooperatively play roles, and therefore the content of COD (Chemical Oxygen Demand), total nitrogen, total phosphorus and ammonia nitrogen which are contained in water is effectively reduced.

The invention relates to a medical minimally invasive operation instrument, in particular to a semicircular working sleeve for a single-hole laparoscope. The semicircular working sleeve comprises a handle and a sheath connected with the handle, wherein the end face of the handle is provided with a plurality of channels, an air filling valve and an air inlet valve; the air filling valve is communicated with an air path of an inflatable air bag arranged on the concave surface at the inner side of the sheath; and the air inlet valve is connected with a carbon dioxide gas source. The semicircular working sleeve is characterized in that the handle, the sheath and the inflatable air bag form a semicircular shape. The invention has the advantages that the semicircular design of the end face of the handle increases the area and the space position for placing the plurality of channels, and a plurality of instruments can be put in; the semicircular sheath has small injuries to the abdominal wall during entering the abdominal cavity through the abdominal wall and is beneficial to the healing of an incision, and an instrument activity space is obviously increased; the port of a silicone tube is covered by an elastic soft material so as to ensure that the semicircular working sleeve for a single-hole laparoscope is easy to enter the incision of the abdominal cavity and have small resistance; and the end face of the handle forms a fusiform design. The invention can also be applied to operations with larger operation difficulties, such as rear abdominal cavity operations, front abdominal cavity operations, and the like.

The invention discloses a microfluidic reactor which comprises a base, a reaction pool plate, a slide, a rubber ring and a spiral cover. The base, the reaction pool plate and the slide form a complete reaction chamber; the spiral cover is horizontally pressed on the slide through the buffering of the rubber ring to seal the reaction chamber. Due to the bionic design of a fusiform reaction pool on the reaction pool plate, the flow field is distributed uniformly during the flow of the fluid in the reaction chamber, and no fluid is left during discharge. The microfluidic reactor can not be affected by the placement azimuth and can be also used for the reaction needing temperature controlling and lighting. The microfluidic reactor can be widely used for the microfluidic reaction experiments in various fields including the biological field, the chemical field, the medical field and the like.

The invention discloses a nitrogen-doped and carbon-coated iron trioxide anode material for a lithium ion battery and a preparation method of the nitrogen-doped and carbon-coated iron trioxide anode material. The preparation method comprises the following steps: coating the outer surface of nano-fusiform iron trioxide with a silicon dioxide layer to serve as a precursor; then coating the outer surface of the silicon dioxide layer with one layer of conducting polypyrrole; finally, annealing to carbonize the polypyrrole, and etching to remove a silicon dioxide interlayer, thus obtaining the nitrogen-doped and carbon-coated iron trioxide anode material with an interlayer void structure. The nitrogen-doped and carbon-coated iron trioxide anode material for the lithium ion battery, provided by the invention, can keep high cycling capacity, excellent cycling stability and high multiplying power (high current density charging and discharging) within a wider temperature range including room temperature, as well as good application prospect.

The invention discloses a roof with an approximately quadrate plane and a super large space pre-stressed steel grid structure and a manufacturing method thereof. When the roof with the approximately quadrate plane of which the ratio of long side L1 to short side L2 is more than or equal to 1 and less than 1.5, L1 is more than or equal to 120 meters and less than or equal to 165 meters and L2 is more than or equal to 90 meters and less than or equal to 150 meters is manufactured, a fusiform space tube truss consisting of a top boom, a lower boom and a diagonal web member is orthogonally connected with another fusiform space tube truss at the same space height position so as to form a grid structure consisting of the fusiform space tube truss; four fusiform space tube trusses constituting the grid structure are manufactured into support stay bar type cable-stayed self-balancing orthogonal space tube trusses; and the central structural heights of all fusiform space tube trusses and the four fusiform support stay bar type cable-stayed self-balancing orthogonal space tube trusses are controlled to be between L2 / 18 and L2 / 16. The roof has the advantages of small occupied space height, small using amount of steel, reliable structural performance, easy manufacturing and construction, low cost and the like.

The invention provides a high-speed train abdomen rectifying device, which relates to high-speed train manufacturing technology. A bogie of the train abdomen is provided with a streamline bogie fairing which covers the bogie and most part of a wheel on the bogie; and the bogie fairing is overlooked as a fusiform shape. The train abdomen rectifying device can significantly reduce the pneumatic resistance at the train abdomen, raise the running safety of a train and also greatly reduce the energy consumption, and has great practical value.

The invention discloses a new method for producing biofuel butanol, comprising the following steps: a. tapioca flour and accessory medium are added with water and blended with processed waste mash, and then gelatinized by increasing the temperature, with the concentration of gelatinization solution controlled between 2 percent and 15 percent; b. after being sterilized and cooled, the gelatinization solution is added into a breeding pot as medium; c. after protane-butane fusiform bacteria is added into the breeding pot, inoculation, breeding, even the fermentation are carried out; and d. when the fermentation broth is separated by a mash tower and then distillated by a distillation tower, biofuel butanol is obtained. The invention uses plants which have high yield and are also not used as human food as raw materials to produce the biofuel butanol, thus providing a clean and efficient biofuel.

The invention discloses a fusiform bionic microstructure with drag reduction characteristics, and belongs to the field of microstructure functional materials. The structure comprises: (a) a fusiform structural layer, and (b) a substrate material layer, wherein a plurality of fusiform structural bodies are arranged on the substrate material layer in a certain arrangement rule to form the fusiform structural layer. On end of the fusiform structural body is a sharp corner, the other end of the fusiform structural body is a circular curved surface, each sharp corner is connected with the circularcurved surface through a smooth curved surface, and the sharp corner ends of the fusiform structural bodies face to the same direction. The fusiform microstructure based on a surface layer microstructure of an alpine fargesia leaf provided by the invention can significantly reduce the surface friction resistance and effectively improve the aerodynamic performance of a solid flow contact layer, sothat the fusiform bionic microstructure can be widely applied to the field of modern engineering.

The invention belongs to the dearsenization method of Sargassum fusiforme, pertaining to foods processing field. Dry Sargassum fusiforme material is dipped in water for 2 hours, then cleaned and leached, and dipped in water solution of citric acid according to a weight volume ratio 0.05 percent to 0.5 percent for 2 to 8 hours. The treated Sargassum fusiforme is cleaned and dried under low temperature. The invention uses weak acid additive met with foods sanitary, quality and safety requirements to dearsenize Sargassum fusiforme, which is safe, reliable, and has simple technique, low cost, a dearsenization rate as high as 85 percent to 94 percent, and effectively cuts down the arsenium content of Sargassum fusiforme, without changing the original flavor and gloss and preserves the original nutrition components of the Sargassum fusiforme.

The invention discloses a primary isolated culture method for dairy cow mammary epithelial cells. The primary isolated culture method comprises steps as follows: mammary tissue of a dairy cow in the lactation period is shorn into tissue blocks, the tissue blocks are digested with collagenase / hyaluronidase digestive juice, a culture dish is inoculated with the digested chylous tissue blocks for culture, cells get free from tissue on peripheries of the tissue blocks after 1-2 days and grow along the wall of the culture dish, fusiform fibroblast is removed with a mechanical scraping method every day during culture, and initial passage is performed when a large quantity of cobblestone-like mammary epithelial cells grow in clusters and in patches and are mutually fused after about 4-5 days. During initial passage, a little fibroblast which is probably mixed is eliminated with trysin with a differential digestive method, and the dairy cow mammary epithelial cells with high purity are obtained. The mammary epithelial cells can emigrate from chylous tissue in a short time; a little mixed fibroblast is removed mainly with a mechanical scraping method, and accordingly, the obtained mammary epithelial cells are seldom damaged and are high in purity.

The invention relates to a marine fish cell culture technology, in particular to an aralichthys olivaceus muscle satellite cell line establishing method, a specific primer for identifying a paralichthys olivaceus muscle satellite cell marker gene and application of the specific primer. The aralichthys olivaceus muscle satellite cell line establishing method comprises the following steps: performing primary culture and subculture of aralichthys olivaceus muscular tissues, and then establishing a cell line; after establishing, performing freezing preservation, resuscitation and identification, wherein a cell culture fluid adopted to primary culture and subculture is obtained through adding fetal calf serum and a human basic fibroblast growth factor into the cell culture fluid. The built aralichthys olivaceus muscle satellite cell line is in the format of fusiform or spindle-shaped monocytes, allows continuous passage, can provide a great number of aralichthys olivaceus muscle satellite cells, and not only can be directly used for researches on aralichthys olivaceus muscle development related functional genes to provide rich cell sources for researches on the molecular mechanism of a fish muscle differentiation pathway, but also is expected to provide a research platform for researches and application of muscle character improvement during aralichthys olivaceus culture production.

The present invention provides a polyacetal resin composition which has excellent friction and wearing characteristics under general sliding conditions comprising a strict sliding condition and then has an excellent mechanical property. To 100 parts by weight of (A) a polyacetal resin, there are added 0.01-1 parts by weight of (B) hindered phenol antioxidants, 0.05-1 parts by weight of (C) nitrogenous compounds, 2-15 parts by weight of (D) grafted copolymer, 0.5-8 parts by weight of (E) aliphatic ester, 2-20 parts by weight of (F) fusiform calcium carbonate, and 2 to 40 parts by weight of (G) an inorganic filler to form the polyacetal resin composition.

The invention provides a surge protection relief valve, which comprises a main valve and a pilot valve, wherein the pilot valve is positioned above the main valve; an outlet valve seat and an inlet valve seat are fixed in a cavity of a pilot valve body at an interval; and a valve shaft is connected with a pilot valve spring arranged on one side of the pilot valve. A central cavity of the pilot valve is communicated with an air chamber in the main valve by an air chamber pipe, while a rear cavity is communicated with the outlet side of the main valve by an outlet pipe. An inner core of a main valve body has an olive shape; a fixed sleeve is fixed at an inlet flange of the main valve body; and a valve seat of the main valve is pressed together with the fixed sleeve. A guide sleeve is fixed on an inner hole on the outlet side of the main valve body; the tail part of a fusiform valve clack is inserted into the guide sleeve; and the conical sealing surface of the front part of the valve clack can be sealed with the valve seat. The inner cavity of the valve clack is combined with the inner core of the main valve body to form the air chamber in the main valve. The surge protection relief valve induces the pressure of a pipeline by the mechanical pilot valve to control the movement of the valve clack of the main valve so as to realize accurate opening, fast relief and the elimination of pressure peaks during the occurrence of surges in the pipeline and play a role in safely and reliably protecting pipeline equipment.

A configuration wherein the tip portion 1a of the cylindrical body 1, which constitutes the main body of the cannula, is closed with the membrane 2 made of a polymer material having elasticity and flexibility. Preferably, the cylindrical body 1 and the membrane 2 are integrally molded with the same membrane material. Thereby, the fluids in the eyeball are prevented from coming off through the cannula even when an instrument is removed. Also, provided that the cylindrical body 1 is made to have a partially swollen fusiform shape, a curved-tip instrument can be inserted. Also, provided that a projection is provided on the outer face of the cylindrical body, the cannula is prevented from coming off from the eyeball during surgery is prevented.