141results about How to "Good expansion effect" patented technology

The invention relates to a system for realizing direct broadcast in media distribution network MDN, relative method and client, wherein said method comprises: A, point-to-point client sends direct broadcast program request to GSLB, said request is directed to the SLB of edge node, then to be directed to the node gateway controller; B, node gateway controller based on stored direct broadcast program information, fixes the point-to-point media service gateway of video direct broadcast data of other points in said request to other point-to-point client or / and built gateway that stores the video direct broadcast data, to send the address of said gateways to the point-to-point client; C, the client selects at least one address to connect, and receives the video direct broadcast data sent from other clients or / and gateways.

The invention provides an annular truss-type large space foldable mechanism which is formed by connecting a plurality of identical 6R mechanism foldable units in an end-to-end mode and in an annular mode. The 6R mechanism foldable units can be symmetrical in the longitudinal direction and in the transverse direction. Each 6R mechanism foldable unit comprises two identical supporting rods and four identical chord members, wherein the two supporting rods are longitudinally arranged in parallel; the four chord members include two upper chord members and two lower chord members, the starting ends of the two upper chord members are connected to the upper ends of the two supporting rods through a revolute pair respectively, the tail ends of the two upper chord members are mutually connected through a revolute pair, the starting ends of the two lower chord members are connected to the lower ends of the supporting rods through a revolute pair respectively, the tail ends of the two lower chord members are mutually connected through a revolute pair, each chord member is movably connected with the adjacent supporting rod through a sliding block crank mechanism, sliding blocks are arranged on the supporting rods in a sleeved mode, one end of each crank is connected with the corresponding chord member through a revolute pair, the other end of each crank is connected with the corresponding sliding block through a revolute pair, and the length of the supporting rods is more than twice that of the chord members. The annular truss-type large space foldable mechanism has a high foldable ratio.

A loudspeaker unit (2) of a loudspeaker system (1) is fitted to a cabinet (4). An absorbent (3) is disposed in a hollow chamber (R) inside the cabinet (4) and absorbs a gas inside the hollow chamber (R). A phase inverting mechanism (8) inverts the phase by resonating with a sound of a specific frequency radiated from the loudspeaker unit (2) into the hollow chamber (R) and radiates this sound to outside. The watertight means of the phase inverting mechanism (8) prevents invasion of moisture into inside the hollow chamber (R) from outside the cabinet (4) through the phase inverting mechanism (8).

A loudspeaker unit (2) of a loudspeaker system (1) is fitted to a cabinet (4). An absorbent (3) is disposed in a hollow chamber (R) inside the cabinet (4) and absorbs a gas inside the hollow chamber (R). A phase inverting mechanism (8) inverts the phase by resonating with a sound of a specific frequency radiated from the loudspeaker unit (2) into the hollow chamber (R) and radiates this sound to outside. The watertight means of the phase inverting mechanism (8) prevents invasion of moisture into inside the hollow chamber (R) from outside the cabinet (4) through the phase inverting mechanism (8).

The invention discloses a logic data partition method and system which are suitable for a RAC data base of a telecom CRM system. The method comprises the steps that a customer number is set for business data and serves as the only identification, the customer number is used as a key value and elimination and remainder Hash algorithm no less than one period is adopted to conduct data partition on the business data. The technical scheme of the logic data partition method and system is strong in adaptability, can adapt to all kinds of large-scale RAC data centers, and because multi-stage Hash logic module value partition and partition route visiting are adopted, non-blocking, high-performance and distributed high-expansivity can be achieved and the defect of a data partition table is overcome.

The invention discloses a netty circular tube type intravascular stent comprising three to six circumambient rings distributed axially, wherein two adjacent circumambient rings are connected by a plurality of connecting rods; each circumambient ring comprises two grid unit groups of mirror symmetry; the grid unit groups in the rings are connected by a plurality of short straight rods; the grid unit groups are formed by uniformly distributing and arranging eight to twelve grid units in the circumambiency; each grid unit is formed by the circumambient sides of connecting open girders and closedgirders in series; each serial connecting port is a semicircular arc; the connecting rods are connected with the top ends of the semicircular arcs of the closed girders in the adjacent circumambient rings and the short straight rods are connected with the top end of each semicircular arc of two different grid unit groups in the same circumambient ring. The stent has the advantages of good mechanical extension property, supporting property and axial flexibility and the like and reduces the reangiostenosis rate. After the stent is expanded, the wall surface of a blood vessel is supported and thestent can avoid damaging the wall of the blood vessel due to overlarge contact stress.

A vehicle rear structure with a curtain air bag device is provided which is capable of, when a predetermined condition is satisfied, effectively restraining a front upper end of a rear pillar trim from breaking and scattering, and spreading a curtain member properly. The air bag device includes a curtain member which is fixed to the body of a vehicle, inflates with a gas pressure supplied when the predetermined condition is satisfied, and spreads so as to cover the interior surface of a side window glass at least from a side end of a roof trim up to a predetermined lower position in the front surface of the rear pillar; a roof side trim is provided between the vicinity of the upper end of the side window glass and the roof trim, and a rear end of the roof side trim is disposed to overlap with the front upper end of the rear pillar trim; and the curtain member spreads from the inner in the vehicle width directions through the boundary part between the rear end of the roof side trim and the front upper end of the rear pillar trim toward a cabin space of the vehicle.

The invention discloses an expandable interbody fusion cage. The expandable interbody fusion cage comprises an outer shell formed by splicing two expansion blocks (1), and is characterized in that the outer shell is of a cavity structure (2), a guide stent (3) and a limiting stent (4) are arranged in the outer shell, the upper end of the limiting stent (4) is arranged at the upper portion of an inner frame of the guide stent (3) and connected with the guide stent (3) through a screw (5), the middle of the limiting stent (4) is attached to the guide stent (3) through staggered slopes (6) on two sides, and the lower portion of the guide stent (3) is fixed to the lower portion of an inner frame of the limiting stent (4). The guide stent and the limiting stent move relatively in the mode that the screw is screwed into the outer shell, the outer shell is propped open and plays a role in expansion, medical staff can adjust the expansion height at will according to interbody conditions of a patient, and a good expansion effect can be achieved.

The invention relates to a preparation method of a J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance, belonging to the field of metal materials. The invention is characterized in that J55-grade steel expansion pipe steel is acquired at low production cost through reasonable alloy design, and is welded to make the pipe instead of the seamlesssteel pipe. The method comprises the following steps: heating a J55-grade steel expansion pipe to 1000-1150 DEG C, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; heating the J55-grade steel expansion pipe to the temperature of 50-100 DEG C higher than the J55-grade steel expansion pipe steel AC3 point, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; and finally keeping the steel plate at the two-phase region temperature of 700-750 DEG C for 30-60 minutes. The invention eliminates the microstructure difference between the base material and the weld zone, implements substantial conformity of properties at all parts of the pipe body, and acquires a uniform distribution ferrite. The content of the ferrite is high, and is approximate to the critical value under such conditions. The method is beneficial to eliminating the zonal structure of the material so as to refine the structure, eliminate some defects (such as voidsand the like) and enhance the uniform elongation rate, so that the J55-grade steel ERW expansion pipe has higher overall diameter expansion performance. The preparation method provided by the invention is simple; and the ERW expansion pipe is practical and economical.

The invention relates to a radiating method, a radiating structure and a radiating part for electronic equipment. According to the radiating method, low-boiling-point liquid-state working medium and liquid-state elementary substance metal / metal alloy are adopted to absorb heat from a heating source in the electronic equipment, wherein the low-boiling-point liquid-state working medium and the liquid-state elementary substance metal / metal alloy are insoluble and non-reactive mutually; the gas generated by heat absorption and gasification of the low-boiling-point liquid-state working medium is used for driving the liquid-state elementary substance metal / metal alloy to flow; and the liquid-state elementary substance metal / metal alloy transfers heat to a radiating part of the electronic equipment in the flowing process. The radiating structure comprises a circulating sealed flowing channel arranged in the radiating part of the electronic equipment, wherein the circulating sealed flowing channel is used for accommodating the low-boiling-point liquid-state working medium and the liquid-state elementary substance metal / metal alloy; and the radiating part comprises the radiating structure. The heated and gasified low-boiling-point liquid-state working medium provides strong power for driving the liquid-state elementary substance metal / metal alloy to flow; and due to the efficient heat convection and heat exchange capability of the liquid-state elementary substance metal / metal alloy, the heat convection energy is radiated, so that the radiating efficiency of the electronic equipment is improved.

An oil well pipe for expansion which is expanded in a well. The oil well pipe is made of a two-phase stainless steel which has a chemical composition containing, in terms of mass%, 0.005-0.03% carbon, 0.1-1.0% silicon, 0.2-2.0% manganese, up to 0.04% phosphorus, up to 0.015% sulfur, 18.0-27.0% chromium, 4.0-9.0% nickel, up to 0.040% aluminum, and 0.05-0.40% nitrogen, with the remainder being iron and impurities, and has a structure having an austenite content of 40-90%. The oil well pipe for expansion has a yield strength of 276-655 MPa and a uniform elongation more than 20%. The oil well pipe has excellent expansibility.

An inspection positioning prostatic capsule expansion catheter includes a catheter main body. The catheter main body is internally provided with a catheterization cavity, a rinse cavity, a front bag cavity, and a rear bag cavity. The four cavities are each provided with a front-end opening. At the rear of the front-end openings of the catheterization cavity and the rinse cavity is the front bag cavity. At the rear of the front bag cavity is the rear bag cavity arranged in parallel. The catheter main body at the tail of the rear bag cavity is provided with a miniature visual probe. The miniature visual probe is mounted on a semi-circular protrusion at the tail of the rear bag cavity.

The invention relates to a fish peptide organic fertilizer which comprises leftovers of aquatic products such as fishes and shrimps as a principal ingredient of a main material, various strains, potassium humate, potassium fulvic acid, a high-purity vinegar solution, a spreader, an IDS (iduronic sulfatase) reinforcer and an EDTA (ethylene diamine tetraacetic acid) chelating agent. The liquid organic fertilizer can regulate a pH (potential of hydrogen) value of soil till the soil is suitable for crop planting, improves acidity and alkalinity of the soil, effectively loosens and improves the soil, optimizes a micro-environment of the soil, improves crop resistance, can effectively improve product quality, and increases a crop yield.

The invention discloses an auxiliary uterine cervix dilator. The auxiliary uterine cervix dilator comprises an inner guiding catheter and an outer guiding catheter. A cervix dilation balloon is arranged at the position, close to the head end of the outer guiding catheter, of the outer side of the outer guiding catheter, a vulva limiting balloon is arranged at the position, close to the tail end of the outer guiding catheter, of the outer side of the outer guiding catheter, two water injection channels are arranged in the wall of the outer guiding catheter and communicated with the cervix dilation balloon and the vulva limiting balloon respectively, and a water injection port I and a water injection port II which are communicated with the two water injection channels are formed in the wall of the outer guiding catheter. A uterus limiting balloon is arranged at the position, close to the head end of the inner guiding catheter, of the outer side of the inner guiding catheter, a water injection port III is formed in the tail end of the inner guiding catheter, the water injection port III is communicated with the uterus limiting balloon through a water injection channel formed in the wall of the inner guiding catheter, and the tail end of the inner guiding catheter stretches out of the outer guiding catheter and is connected with a drawing board. The outer guiding catheter is provided with a positioning clamping pin used for fixing the inner guiding catheter. According to the auxiliary uterine cervix dilator, the cervix dilation balloon can be accurately limited at the cervix, cervix dilation is facilitated effectively, the internal opening of the uterine cervix can also be dilated appropriately, the cervix cannot be injured, and the auxiliary uterine cervix dilator is safe and convenient to use.

The invention discloses acrylic acid outer wall latex paint and a preparation process thereof, relates to the technical field of paint, and solves the problems that due to the fact that an outer walllatex paint coating layer is easily aged under the effect of an external environment, the overall application effect of the outer wall latex paint is not good. The acrylic acid outer wall latex paintcomprises, by weight, 320-350 parts of water, 2-5 parts of hydroxyethyl cellulose, 8-12 parts of ethylene glycol, 1.2-1.6 parts of polydimethyl siloxane, 90-110 parts of titanium dioxide, 95-115 partsof kaolin, 4-5 parts of wollastonite powder, 260-280 parts of ground calcium carbonate, 170-190 parts of pure acrylic emulsion, 3-5 parts of Tex film-forming agent, 0.8-1 part of PT86 mildew preventive, 0.8-1.2 parts of neutralizer, 4.5-7.5 parts of dispersing agent and 1.2-2.4 parts of pitaya seed extract. The acrylic acid outer wall latex paint has the advantages that the coating layer after the acrylic acid outer wall latex paint is used is good in stability, the coating layer cannot be easily aged under the effect of the external environment, and the overall application effect of the acrylic acid outer wall latex paint is good.

The invention relates to an expanding type vertebral body shaper, comprising a mandrel, an ejector sleeve and a propped-open ball, wherein the ejector sleeve is sleeved on the mandrel; the propped-open ball is made from developer doped with high polymer medical plastics; the left end of the propped-open ball is fixed on the left end head of the mandrel, and the right end thereof is fixedly connected with the left end head of the ejector sleeve in a detachable manner; when the ejector sleeve is arranged at the right side of the mandrel, the connecting bars of the propped-open ball main body are in an unfolded state, and the connecting bars of the propped-open ball main body are in a curled state when the ejector sleeve is arranged at the left side of the mandrel. The invention can be added with a protection jacket which comprises a sleeve and a latex coat, the latex coat is provided with a sealed left end and a right opening, the right section of the latex coat covers the outside of the sleeve, and the left section thereof is arranged at the left of the left end of the sleeve, thus being a latex rubber nipple which is propped open inside. The invention also can be added with a gun-shaped casing and a control component to simplify the expanding operation of the propped-open ball. The expanding type vertebral body shaper is convenient, safe and reliable.

The invention discloses a tube expanding device, in particular to a tube expanding head for the tube expander, which mainly utilizes the device to enable the heat exchange pipe of a heat exchanger and a tube sheet to be expanded for stable sealing. The invention comprises a gatling (10), a conical mandrel (11) arranged inside the gatling (10), at least two vertical long holes evenly distributed on the circumference of the lateral wall of the gatling (10), a pin roller (15) arranged in each long hole. The tube expanding device has the advantages of enabling the sealing between the heat exchange pipe and the tube sheet 2 to be tighter, and the leakage phenomena of the mediator not to happen during the work.

The invention relates to Chinese herbal medicament oral liquid for treating chicken respiratory infectious disease, which is a preparation prepared from the following raw materials in part by weight: Cyrtomium fortunei 4-6, ephedra herb 4-6, tangerine peel 4-6, wild buckwheat rhizome 2-4, spreading hedyotis herb 2-4, platycodon root 2-4, common selfheal fruit-spike 2-4, astragalus root 1-3, baical skullcap root 1-3, Indian buead 1-3, manchurian wildginger 0.1-0.3, and liquoric root 0.5-1.5. When used for treating chicken respiratory infectious disease, the Chinese herbal medicament oral liquid has the characteristics of short treatment period, high cure rate, safety, no toxic nor side effects and convenient administration.

The invention belongs to the technical field of steel pipe flattening mechanisms, and provides a steel pipe cutting and flattening device. The device comprises a stretching shaft, a conveying mechanism and a cutting mechanism, wherein the stretching shaft comprises a suspended end for allowing a steel pipe to sleeve externally and a fixed end connected to a machine frame, the shaft diameter of thestretching shaft is gradually increased from the suspended end to the fixed end, the conveying mechanism is used for conveying the steel pipe from the suspended end to the fixed end, the cutting mechanism is used for axially cutting the side wall of the steel pipe in the conveying process of the steel pipe. According to the device, the technical effect of rapidly and efficiently cutting and flattening the heated steel pipe can be realized.

The invention discloses a method for producing variable-thickness variable-diameter steel pipes. The method comprises the following four steps: unidirectionally fixing a mother pipe through a mother pipe feeding end; pushing the mother pipe through a pushing device to pre-expand the diameter of a mother pipe output end; bidirectionally fixing the mother pipe through the mother pipe feeding end and the mother pipe output end; expanding the diameter of the whole mother pipe through the pushing device and a drawing device. The method substantially changes the wall thickness of the steel pipe and also precisely controls the wall thickness of the steel pipe after diameter expanding, and the produced big-caliber seamless steel pipe has a good mechanical property and good appearance quality.

The invention relates to a pressure-bearing cable capable of efficiently dissipating heat. The cable comprises a cable body and a shape-memory heat-conducting sheet sleeving the cable body. The shape-memory heat-conducting sheet extends in the length direction of the cable and has a spiral radial cross section in a static force state. The shape-memory heat-conducting sheet is composed of a first heat-conducting layer, a second heat-conducting layer and a sealing cavity defined by the first heat-conducting layer and the second heat-conducting layer. The first heat-conducting layer forms the spiral outer layer of the shape-memory heat-conducting sheet. The second heat-conducting layer forms the spiral inner layer of the shape-memory heat-conducting sheet. The pressure-bearing cable capable of efficiently dissipating heat can spontaneously and automatically change the corresponding heat dissipation area according to a heat generation condition of the cable so as to guarantee the stability of cable temperature, to prevent various damages and dangers due to over-high cable temperature, and to reduce a waste of electric power, and can capture external wind to dissipate the heat more efficiently by using the external wind. In addition, the cable has good anti-compression performance.

The invention discloses a urethral calibrator expander formed by a spherical probe (1), a connection rod (2) and an expansion tube (4) orderly connected from left to right. The right end of the connection rod (2) is covered with a tapered expanding device (3); the top of the tapered expanding device (3) faces the ball probe (1) and the bottom faces the expanding tube (4); the interior of the tapered expanding device (3) is in a hollow-bowl structure; the length of the tapered expanding device (3) is shorter than the connection rod (2); and the diameter of the bottom surface of the tapered expanding device (3) is greater than the diameter of a cross section of the connection rod (2). The narrow part of the urethral stricture can be effectively probed; the diameter and the length of the narrow part can be measured; relative reference information is provided for urethrostenosis surgery treatment and surgical method; meanwhile, pains of a patient and damage to the urethral stricture due to the exchange of various types of urethral calibrator expander can be reduced as possible as can; a material drawing performance for urethral stricture inflammatory excreta and stones can be met; and inspection and clinical treatment guide can be facilitated.

The invention relates to the technical field of coatings, in particular to an organic-inorganic antibacterial antifouling interior wall coating and a preparation method thereof. The coating is prepared from an inorganic hybrid perfluorocarbon modified acrylate self-emulsifying emulsion, zeolite-loaded silver, silica gel-loaded silver, a functional filler, calcined kaolin, wollastonite powder, ash calcium powder, a Taieasy HD-20 dispersing agent, a Taieasy inorganic powder DS-195 dispersing agent, 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol and deionized water. The inorganic hybrid perfluorocarbon modified acrylate self-emulsifying emulsion is used as a base material, and zeolite-loaded silver and silica gel-loaded silver are used as a composite inorganic mildew preventive, so that the coating has the characteristics of chemical corrosion resistance, flame retardance, fire prevention and environmental protection of an inorganic coating and the advantages of strong adhesive force and good scrubbing resistance of an organic coating; the coating is safe and non-toxic, excellent in mildew-proof performance and long in mildew-proof validity period.

The invention discloses a balloon catheter which comprises a push catheter and at least two expandable balloons at the distal end of the push catheter. The push catheter comprises a catheter body anda branch body disposed at a distal end of the catheter body. The branch body comprises at least a first branch and a second branch extending in different directions respectively. The angle between theaxial direction of the first branch and the axial direction of the second branch is (0 DEG, 180 DEG). The expandable balloon comprises at least one first balloon disposed distally of the first branchand at least one second balloon disposed distally of the second branch. The proximal end diameter of the working segment of at least one of the first balloon and the second balloon is less than the diameter of the remainder of the working segment of the balloon. The balloon catheter of the invention can expand the narrow lesion of the bifurcated blood vessel at one time, reduce the number of intubation, make the expansion fully, avoid the tear of the blood vessel, save the operation time, and reduce the operation cost and complexity.

The present invention provides a medicine component containing a tobramycin inhalation solution and an application thereof. The medicine component comprises: (a) the tobramycin inhalation solution; and (b) the vibrating screen atomizer used in cooperation with the tobramycin inhalation solution. The central area of a metal mesh of the vibrating screen atomizer has 1400-1800 micropores. The fogdrop particle size of the tobramycin inhalation solution is as follows: D10 ranges from 0.5 [mu]m to 2.5 [mu]m, D50 ranges from 2.0 [mu]m to 4.2 [mu]m, and D90 ranges from 6.0 [mu]m to 9.0 [mu]m. The mass percentage of the particles with the aerodynamic particle size smaller than 5.39 [mu]m in the tobramycin inhalation solution is not smaller than 45%. The medicine component has a remarkable effect on clinically treating bronchiectasia.

The present invention relates to beverage technology, and is especially one kind of kudzu vine and leaf tea. The kudzu vine and leaf tea is made with kudzu vine and leaf, and has good color and taste. The present invention makes best use of kudzu vine and leaf.

The invention discloses a multi-stage temperature control machining and forming device for a PVC-O tube. The multi-stage temperature control machining and forming device comprises an extruder, a cooling device, a traction apparatus and an expansion mandrel; the right side of the head of the extruder is provided with a first cooling device; the end, close to the head of the extruder, of the first cooling device is provided with a fixed-diameter sleeve; the other side of the first cooling device is provided with a first traction apparatus; the end, far away from the first cooling device, of thefirst traction apparatus is provided with the expansion mandrel; the expansion mandrel is positioned inside a water tank; the water tank is divided into a region I, a region II and a region III by using heat insulating plates; the inside of the expansion mandrel is of a hollow core structure; the expansion mandrel is divided into a first cylinder, a cone and a second cylinder by virtue of the heatinsulating plates; a hollow connecting rod is arranged inside the expansion mandrel; the expansion mandrel is connected with the head of the extruder through the hollow connecting rod; the end, far away from the first traction apparatus, of the expansion mandrel is provided with a second cooling device; and the end, far away from the expansion mandrel, of the second cooling device is provided with a second traction apparatus. The multi-stage temperature control machining and forming device disclosed by the invention solves the problem that the wall thickness of the tube is not uniform, and guarantees the quality of a tube blank.

The post-mounted expansion unit includes an expansion rod, and an expansion mechanism in the lower part of the expansion rod, and the expansion mechanism includes the expansion hole in the lower part of the expansion rod, expansion slot and conic push head with guide section and matching the expansion hole. The said technological scheme has strong and firm expansion rod, and expansion mechanism with obviously raised connection strength between the post-mounted part and the deep hole. In addition, the expansion hole wall and the conic push head have anti-skid thread to further raise the connected strength.

The invention discloses a polysilicon reducing furnace which comprises a chassis, a furnace body, 36 pairs of electrodes, an air inlet system and an exhaust system, wherein the 36 pairs of electrodes are arranged on the chassis and are respectively distributed on first, second, third and fourth concentric circumferences; each nozzle comprises a base, a drainage portion and a diversion portion; a first air inlet cavity is formed on the base; the drainage portion is connected with the upper end of the base; a second air inlet cavity is formed on the drainage portion and is communicated with the first air inlet cavity; the cross section area of the second air inlet cavity is smaller than that of the first air inlet cavity; the diversion portion is connected with the upper end of the drainage portion; a central orifice is formed in the middle of the diversion portion; a plurality of lateral orifices surround the central orifice and are uniformly distributed on the diversion portion along the circumferential direction; and the central orifice and the plurality of lateral orifices are communicated with the second air inlet cavity. According to the polysilicon reducing furnace disclosed by the embodiment of the invention, the heat energy can be reasonably utilized, and the production efficiency of the reducing furnace can be simultaneously improved.

The invention provides a calculus removing balloon and device under a choledochoscope, and relates to the technical field of medical equipment. The calculus removing balloon under the choledochoscope comprises a balloon catheter and a balloon body; the balloon body is provided with an opening end, the opening end is in sealed connection with the outer surface of the balloon catheter, and an expansion cavity is formed between the balloon body and the outer surface of the balloon catheter; the end face of the balloon catheter is located in the expansion cavity, and the balloon catheter is used for discharging gas or liquid in the gas-liquid device into the expansion cavity. According to the calculus removing balloon under the choledochoscope, due to the fact that only one opening end of the balloon body is connected with the outer surface of the balloon catheter in the sealed mode, in the balloon body expansion process, the end face of the balloon catheter is located in the expansion cavity, the end, away from the opening end, of the expansion cavity is not limited, and the balloon body can adjust the expansion direction of itself; therefore, the problem that a conventional balloon catheter is eccentric is effectively avoided. In addition, the balloon body can have a larger length size, and the expansion effect is better.