193 results about "Membrane rupturing" patented technology

The present invention relates to a capsule containing a substance for the preparation of a beverage that is designed to be extracted by injection of a fluid under pressure. The capsule comprises a closed chamber containing the substance with at least part of the closed chamber including a retaining part made of a flexible membrane. One or more raised elements that face the membrane are associated with and forming part of the capsule. These element(s) are used to open the capsule due to a buildup of pressure therein. This rise in pressure causes relative engagement of the raised element(s) with the membrane until the membrane ruptures or is torn to release the formed beverage from the chamber. As the liquid of the beverage does not come into contact with the machine, hygiene is improved and cross-contamination is reduced when preparing a beverage from the capsule.

The invention discloses a step-by-step friction stir brazing method for a thick aluminium plate and a rigid dissimilar material. The method can be used for avoiding various problems such as needle abrasion (when a tool with a needle is used), insufficient interface heat, poor mechanical membrane rupture effect and the like existing in the direct friction stir brazing process of the thick aluminium plate and the rigid dissimilar material (such as stainless steel, copper, titanium and steel). The method comprises the following steps of: firstly brazing a thin aluminium plate on the to-be-brazed surface of a rigid dissimilar material through needle-free friction stir brazing, striping by virtue of a metallurgical factor and a mechanical factor, and extruding brazing filler metal, thus realizing a compact joint between the thin aluminium plate and the rigid dissimilar material; and welding the thin aluminium plate brazed on the rigid dissimilar material and a thick aluminium plate through friction stir brazing or friction stir welding, wherein when friction stir brazing is utilized to weld lap joint in the second step, the welding-on area can be obviously enlarged. The process can be used for completely preventing rigid parent metal from abrading a tool; and the interface welding-on of the thin aluminium plate and the dissimilar material is reliable. The method disclosed by the invention can be used for preparing aluminium / stainless steel contact rails and aluminium / copper transition joints.

The invention provides a non-woven ceramic membrane with excellent closed-pore performance for a lithium ion battery. The non-woven ceramic membrane comprises a non-woven base material and coatings with the closed-pore performance. The non-woven ceramic membrane is characterized in that the coatings with the closed-pore performance are uniformly coated on the two surfaces of the non-woven base material, the thickness of the non-woven ceramic membrane for the lithium ion battery is 30-50mu m, the porosity of the non-woven ceramic membrane is 40-60%, the average pore diameter of the non-woven ceramic membrane is 0.1-0.5mu m, the closed-pore temperature of the non-woven ceramic membrane is 120-130 DEG C, and the membrane rupture temperature of the non-woven ceramic membrane is 300-500 DEG C. The invention also provides a preparation technology of the non-woven ceramic membrane with the excellent closed-pore performance for the lithium ion battery. The non-woven ceramic membrane has the advantage that the disintegration or explosion of the battery is not easy cause; the adhesive power between the ceramic coating and the base material is increased, and no powder falls off the surface of the membrane under the conditions of bending, rubbing and the like; the consistency of the membrane thickness is substantially improved; and the non-woven ceramic membrane has good high temperature resistance performance, high ion penetrability, low resistance and stable electrochemical property.

The invention discloses a preparation method for an isolating membrane of a lithium ion battery. The preparation method comprises the following steps of (1) extruding a mixed raw material to form a polyethylene solution; (2) cooling the polyethylene solution to form a sheet material; (3) stretching the sheet material to obtain a thin film; (4) performing extraction on the thin film to form a micropore membrane; and (5) performing heat setting on the micropore membrane to obtain the isolating membrane of the lithium ion battery, wherein the mixed raw material in the step (1) comprises silane grafted and modified crosslinkable polyethylene and a filling agent. The isolating membrane prepared by the preparation method disclosed by the invention is relatively low in hole-closing temperature and relatively high in membrane rupture temperature, so that the safety of a battery prepared from the membrane is effectively improved.

The invention provides a ceramic coating with closed-cell properties. The ceramic coating is composed of the following components in percentage by mass: 20-30% of inorganic particle, 10-15% of low-melting-point high-polymer particle, 2-10% of adhesive and the balance of solvent. The invention also provides a lithium ion battery diaphragm which is composed of a polyolefin microporous membrane and a ceramic coating with closed-cell properties applied on one side of the polyolefin microporous membrane. The lithium ion battery diaphragm has the advantages of low closed-cell temperature, high membrane rupture temperature, small heat shrinkage and favorable binding property of the polyolefin base membrane, and can effectively enhance the safety performance of the lithium battery. The diaphragm preparation technique is simple, and is suitable for industrial production.

The invention belongs to the technical field of medical instruments, and discloses a membrane rupture needle special for the obstetrics department. The membrane rupture needle special for the obstetrics department comprises a tube body, a rotating support is arranged at the right side of the tube body, an auxiliary fixing frame is arranged at the lower side of the rotating support, the auxiliary fixing frame and the rotating support are connected together through an auxiliary fixed connection rotating shaft, a telescopic supporting arm is arranged at the lower side of the auxiliary fixing frame, and a telescopic fastener is arranged at the connecting position between the telescopic supporting arm and the auxiliary fixing frame. The membrane rupture needle special for the obstetrics department is simple in structure, easy to operate, high in stability and reliability, and high in success rate and safety, the stroke of the membrane rupture needle can be controlled according to the actualsituation, unnecessary damage generated by membrane rupture is redcued, and therefore pains of a puerpera are reduced.

A coilia ectenes step type breeding method comprises the nine steps of reserved parent pool simulated ecological cultivation, parent pool intensive culture, parent selection for induced spawning, parent induced spawning, natural insemination, germ cell collection, germ cell incubation, indoor intensive fry rearing in a cement pool and large-scale fry culture in an outdoor pool. The method is characterized in that filial-generation coilia ectenes adult fishes which are more than 2 years old and cultured by manpower are used as reserved parents for artificial propagation, and a natural ecology cultivation mode is simulated; the selected parents are transported and placed in an induced spawning pool, after parent induced spawning is conducted, the germ cells are collected, counted and transferred to an incubation pool, after the germ cells are collected, the germ cells are placed in the incubation pool with water, fries open the mouths 5-6 days after membrane rupture is conducted, yolks and freshwater rotifers which are filtered through a 80-mesh silk net are fed to the fries, after the fries are cultivated for 15 days, the fries are divided to different pools, and when the fries are as long as 20-30 mm, the fries are placed to outdoor pools to be cultivated.

The invention provides a bionic binary cooperative nano-carrier as well as a preparation method and an application thereof. The bionic binary cooperative nano-carrier comprises an erythrocyte membrane, glucose oxidase, iron-supporting ferritin nano-particles and a photosensitizer, wherein the glucose oxidase and the iron-supporting ferritin nano-particles are coated with the erythrocyte membrane,and the photosensitizer is embedded into the surface of the erythrocyte membrane or entrapped by the erythrocyte membrane. Chain stimulative responsibility coordination of tumor hunger therapy and chemical kinetic therapy is realized, two enzymes are conveyed to a target site of an organism with the carrier on the basis of biocompatibility of the erythrocyte membrane and tumor targeting of targeting molecules, accurate administration is realized by membrane rupture based on 808 nm near-infrared light illumination in the tumors, the problem of drug resistance is solved effectively, furthermore,systemic toxicity caused by drug application is remarkably reduced, and damage to other normal tissue in an in-vivo circulation process is prevented effectively. The invention further provides the preparation method of the bionic binary cooperative nano-carrier. The bionic binary cooperative nano-carrier and the preparation method have good application prospect.

The invention discloses an outward flow prevention type membrane rupture device for obstetrics and gynecology department. The outward flow prevention type membrane rupture device comprises a catheter, wherein a pull rod sleeves one end of the catheter; the other end of the catheter is connected with a conical head and an anti-flow cover; the conical head is positioned inside the anti-flow cover; one end, near the conical head, of the pull rod is provided with a piston; the piston and the inner wall of the catheter are in matched installation; a support frame is fixedly arranged on the inner wall of the catheter; a membrane rupture needle is arranged on the support frame; a through hole is positioned between the support frame and the conical head; the through hole is connected with an inlet end of a buffer box through a water pipe; the water inlet end of the buffer box is provided with a valve; the buffer box is positioned in a support box; one side surface of the support box is fixedly connected with the side surface of one support leg; one end of each support leg is provided with a universal wheel. The structure of the whole device is simple; the operation is convenient; the injury on fetuses and envelopes in the membrane rupture process is effectively avoided; the outward flowing of amniotic fluid is prevented; the child delivering difficulty of medical care personnel is greatly reduced.

The invention provides a device and a method for sludge treatment. The device for the sludge treatment comprises a membrane rupture reactor, an ozonator and a coagulation reactor, wherein an aerating apparatus is arranged on the bottom and / or the side wall of the membrane rupture reactor, an outlet of the ozonator is connected with an air inlet of the aerating apparatus, and a feeding outlet of the membrane rupture reactor is connected with a feeding inlet of the coagulation reactor. When the device for the sludge treatment is used for treating sludge, the sludge to be treated, oxidation guiding catalysts and ozone generated by the ozonator have a redox reaction with each other in the membrane rupture reactor, then achieved reaction products are delivered into the coagulation reactor to be through coagulation treatment, then achieved sludge which is through the coagulation treatment is concentrated and filter pressed, and the sludge treatment is completed. When the device for the sludge treatment is used for treating sludge, the redox reaction and the coagulation treatment are carried separately, so that under the condition that all materials are input continuously, the sludge treatment can be carried out continuously, and efficiency of the sludge treatment is improved.

A lithium ion battery separator consists of a PE micro-porous substrate A and a micro-porous coating B which is located on the substrate A and formed of mixing pre-crosslinked rubber particles and ceramic fine powder composite materials. The separator has characteristics of good compressible elasticity, thermal shutdown, low heat shrinkage, high temperature membrane rupture resistance and so on.

The invention discloses a membrane rupture device. The device comprises a cylinder body, a mounting cavity is formed in the cylinder body, and a suction cup is arranged at an opening of the right endof the mounting cavity and is of a conical structure; a light reflection layer is arranged on the inner wall of the suction cup, a retractable rod is arranged in the cylinder body, and a puncture mechanism is arranged at the right end of the retractable rod; a guide sleeve slidingly sleeves the outer side of the retractable rod and is fixedly connected with the inner wall of the mounting cavity through a positioning rod, and a rotation limit mechanism is arranged between the guide sleeve and the retractable rod and comprises a limit groove formed in the inner wall of the guide sleeve and a limit protrusion located at the outer side of the retractable rod; a transmission screw hole is formed in the left end of the retractable rod. The membrane rupture device is simple and reasonable in structure, through a rotation motor, a puncture needle can pierce into through a rotation mode, and the puncture effect is improved. By adopting a mode that part of membrane is sucked in an auxiliary extrusion cylinder for puncture, the hidden safety dangers during direct puncture are avoided, the safety of the device is improved, and the practicability is high.

The invention belongs to a fish artificial incubation method field relating to the artificial incubation method of ictalurus punctatus. After the parent fishes are in natural spawning fertilization in a spawning pond, the egg masses collected are disposed in an incubating plant for hatching, which is characterized in that the hatching water salinity is 0.1 to 8%, the alkalinity and hardness are larger than 20mg / L calcium carbonate, the hydrogen sulfide is smaller than 0.005mg / L, the iron is smaller than 0.2mg / L, the ammonia is smaller than 0.5 mg / L and the dissolved oxygen is larger than 5mg / L. The water temperature should be maintained from 24 degree to 30 degree. The membrane rupture prophase of this incubation method is implemented inside a cement pool or a circuit in which the conditions such as water temperature are relatively stable. After the melanose of eyes are emerged or the egg masses are turned into red, the fries are moved to a hatching tray for the rupture of membrane. Therefore, the fry activities are easy to observe, and the fry collecting can also be facilitated.

A new type of airbag inflator is described. The airbag inflator includes a chamber that houses a quantity of inflation gas. The inflation gas is capable of filling and deploying an airbag. The inflator also includes a membrane that seals the chamber. A sliding baffle is also added to the inflator. The sliding baffle is positioned proximate the membrane. The sliding baffle has a membrane rupture mechanism and a plurality of gas flow holes. Upon initiation of the inflator, the sliding baffle slides to cause the rupture mechanism to fail the membrane. The rupture mechanism fails the membrane by detaching a single piece from the membrane. The single piece is sufficiently large such that it remains within the inflator (or within the sliding baffle) and does not pass through one of the gas flow holes.

The invention provides an oxidation-oriented catalyst used for sludge treatment. The oxidation-oriented catalyst for sludge treatment comprises the following components in percentage by weight: 5-45% of metal compound and 55-95% of adsorbent. The oxidation-oriented catalyst comprises the metal compound, so that the oxidation-oriented catalyst can be used as an oxidation initiator to promote the generation of hydroxyl radicals and decompose organic matters in sludge; the oxidation-oriented catalyst comprises the adsorbent, so that the oxidation-oriented catalyst has a larger specific surface area and a strong adsorption capacity and can efficiently adsorb solid granular matters in the sludge from gas or liquid; and during the sludge treatment, an acidity and alkalinity regulator is not required to be added into the oxidation-oriented catalyst, so that membrane condensation on the surface of a microbial extracellular polymeric substance (EPS) is avoided, membrane rupture and decomposition of the EPS in the sludge are facilitated, and thus the sludge treatment efficiency is improved.

The invention relates to the technical field of combustion experiments, and aims to provide a shock tube electric needle piercing and membrane rupturing device capable of being used under low pressureconditions. The shock tube electric needle piercing and membrane rupturing device comprises a micro motor, wherein the micro motor is fixedly mounted on the inner wall of a shock tube by means of a motor base, a motor screw is parallel to the axis of the shock tube and has threads; a hollow tubular needle piercing sleeve has an opening end and a closed tail end, and a piercing needle is mounted at the tail end; the needle piercing sleeve is internally provided with threads or a rack in the length direction of the needle piercing sleeve, the needle piercing sleeve sleeves the motor screw fromthe opening end and drives the threads or the rack to be engaged with the threads of the motor screw; and the outer side of the needle piercing sleeve is provided with a transverse protruding portionhaving a through hole, a guide rod parallel to the needle piercing sleeve passes through the through hole, and one end of the guide rod is fixed on the micro motor. According to the shock tube electric needle piercing and membrane rupturing device, the needle withdrawing speed of the piercing needle is faster and more uniform than that of an ordinary mechanical needle piercing and membrane rupturing mechanism by adopting electric control, the precise time of membrane rupturing is easier to control, the piercing needle is convenient to replace, easy to seal and high in universal performance, and the shock tube electric needle piercing and membrane rupturing device can be well used under the low pressure conditions, is reliable and efficient and has good repeatability.

A pain-alleviating injection needle includes a hollow body adapted to contain a liquid medication. A needle is provided having an attachment end and a piercing end. The attachment end is in fluid communication with the hollow body. A frangible membrane overlies the piercing end of the needle. The membrane is filled with a topical anesthetic. Upon the membrane being pressed against a selected injection site, the membrane ruptures releasing topical anesthetic onto the injection site, thereby numbing the injection site. Upon further pressure being exerted, the piercing end of the needle pierces the injection site.

The invention discloses a eukaryotic cell nucleic acid extraction method and provides a nucleic acid extraction method which comprises the following steps of: uniformly mixing a to-be-tested sample with alkaline liquid, and performing reaction at a high temperature, thereby obtaining nucleic acid. Experiments prove that compared with an existing DNA extraction method, the method provided by the invention has the advantages that operation steps such as repeated cleaning, warm bath and centrifugation are removed; through creating an alkaline high-temperature liquid environment around the sample, membrane rupture and protein degeneration of eukaryotic cells are accelerated, the extraction efficiency of eukaryon genome DNA is greatly improved, and rapid DNA extraction is realized. The nucleic acid extraction method has no special requirements on aspects of sample types and laboratory conditions, is wide in application range and is suitable for popularization and application.

The invention discloses a lithium ion battery diaphragm with three kinds of microporous structures, and a polyethylene composition adopted by the same. The composition comprises high-molecular polyethylene, ultra-high-molecular polyethylene and an optional additive. The lithium ion battery diaphragm prepared from the composition has integrally-formed three kinds of microporous structures; and in addition, the lithium ion battery diaphragm has relatively low closed-hole temperature, high heat resistance shrinkage, high tensile strength, high puncture strength and relatively high membrane-rupture temperature, thereby ensuring safety in preparation and usage of the lithium ion battery.

An electrochemical cell generating hydrogen gas upon discharge, wherein the cell has an outer casing, a vent aperture passing through a wall of the casing, and a rupturable membrane covering the vent aperture. The outer casing preferably has a flat wall running along the cell's length and a vent aperture passing through the flat wall. The cell may typically be an alkaline cell in the shape of a cuboid. The rupturable membrane may be secured by a ring facing the inside surface of the flat wall of the casing in a position adjacent the vent aperture. The rupturable membrane is preferably of polysulfone. The membrane allows hydrogen gas to permeate therethrough to the environment and is rupturable if hydrogen gas within the cell interior builds up rapidly to a threshold pressure level. Optionally, a pointed puncture member extends into the vent aperture to assist membrane rupture.

The invention provides a gynecology and obstetrics membrane rupture device and a use method thereof, and belongs to the field of gynecology and obstetrics medical instruments. By means of the gynecology and obstetrics membrane rupture device, the problems that dangers exist in the use process of existing membrane rupture devices and operation is complicated are solved. The gynecology and obstetrics membrane rupture device comprises a membrane rupture cylinder, and membrane rupture needles are fixed to the inner wall of the front end of the membrane rupture cylinder. The gynecology and obstetrics membrane rupture device further comprises a pushing rod, an inner sleeve, an outer sleeve, an outer cylinder and an inner cylinder, wherein a piston is fixed to the front end of the pushing rod, the outer wall of the piston is attached to the inner wall of the membrane rupture cylinder, the inner wall of the outer cylinder is arranged on the outer wall of the inner cylinder in a sleeving mode, the bottom end of the outer cylinder is everted and connected with the bottom end of the inner sleeve, a top membrane plate is fixed to the inner wall of the top end of the outer cylinder, the bottom end of the inner cylinder is everted and connected with the inner wall of the membrane rupture cylinder, a sealing plate is fixed to the inner wall of the top end of the inner cylinder, an outer liquid inlet hole and an inner liquid inlet hole are formed in the outer cylinder and the inner cylinder, outer air holes are formed in the outer sleeve and the inner sleeve, an inner air hole is formed in the cylinder wall of the membrane rupture cylinder, a first sliding hole, a second sliding hole and a third sliding hole are formed in the inner sleeve, and the membrane rupture needles are arranged in the first sliding hole in a penetrating mode and are pressed against the front end of the first sliding hole. By means of the membrane rupture device, membrane rupture operation can be completed quickly and safely.

The invention provides an electrochemical power-supply composite membrane and a preparation method thereof. The electrochemical power-supply composite membrane comprises a polyolefin membrane layer and an organic-inorganic composite layer combining with the surface of the polyolefin membrane layer; the organic-inorganic composite layer comprises an organic binder, a hollow inorganic powder, inorganic nanometer fiber and an organic solvent formula component, wherein the organic binder accounts for 1%-50% by mass of the sum of the organic binder and the organic solvent, and the hollow inorganic powder and the inorganic nanometer fiber respectively accounts for 0.5%-25% by mass of the sum of the organic binder, the hollow inorganic powder, the inorganic nanometer fiber and the organic solvent. The electrochemical power-supply composite membrane is effectively improved in membrane rupture temperature, heat dissipation performance and strength, and reduced in weight, and thus the safety performance and the cycle service life of an electrochemical power supply are prolonged, and the energy density of the electrochemical power supply is improved. The preparation method of the composite membrane is simple in technology and high in production efficiency, and is suitable for industrial production.

The invention discloses an exosome drug delivery system as well as a preparation method and application thereof, provides an active drug loading system for loading a cis-platinum prodrug on an exosome by utilizing a phospholipid compound, and solves the problems of membrane rupture, low drug loading capacity and the like caused by an exosome drug loading strategy. According to the invention, the cis-platinum prodrug is prepared in advance and is prepared into the liposome, and then the liposome is mixed with the exosome to realize active drug loading, so that the fusion effect of the phospholipid compound and the exosome membrane is utilized, the completeness of the exosome membrane is protected, and the drug loading capacity of the exosome to the anti-cancer drug is improved.

The invention discloses an anti-outflow membrane rupture device for obstetrics clinic. The device comprises a base, a hydraulic press, an operating platform and a liquid storage tank, the hydraulic press is arranged at the upper part of the base, the hydraulic press is fixedly connected to the base through bolts, a telescopic rod is arranged at the upper part of the hydraulic press, the telescopicrod is telescopically connected to the hydraulic press, an operating platform is arranged at the upper part of the telescopic rod, a controller is arranged at the upper part of the operating platform, the controller is fixedly connected to the operating platform through bolts, and the liquid storage tank is arranged at the side surface of the controller. According to the anti-outflow membrane rupture device for obstetric clinic, a medical staff holds the handle and enables the protective cover to fit the production position of a pregnant woman so as to avoid amniotic fluid leakage during membrane rupture, an air pump is started to inflate an expansion air bag at the front end of a water pipe, and the expansion air bag is inflated, and swells to expand the production position of the pregnant woman. A camera can observe the inside of the production position of the pregnant woman and display the inside of the production position through a display module of the controller, so that the medical staff can intuitively know the condition of the production position of the pregnant woman.

The invention relates to an outward-flowing-preventing type membrane rupturing device for the obstetrics and gynecology department and belongs to the technical field of medical apparatus. The outward-flowing-preventing type membrane rupturing device comprises a pipeline storage bin, an amniotic fluid drainage box and a membrane rupturing device body storage box, wherein a hidden battery case is disposed on the lower side of the pipeline storage bin, a pipeline storage bin door is disposed on the pipeline storage bin, the pipeline storage bin door is connected with the pipeline storage bin through hinges, an amniotic fluid temporary-storage bottle is disposed in the amniotic fluid drainage box, a moving handle is disposed on the right side of the amniotic fluid temporary-storage bottle, a bottle cap is disposed on the upper side of the amniotic fluid temporary-storage bottle, a membrane rupturing device body dustproof cover is disposed on the left side of the membrane rupturing device body storage box, a pushing crossbeam clamp groove is formed in the membrane rupturing device body storage box, a crossbeam anti-falling base is disposed in the pushing crossbeam clamp groove, and a membrane rupturing device body pushing crossbeam is disposed on the left side of the crossbeam anti-falling base. The outward-flowing-preventing type membrane rupturing device is complete in function, convenient to use during amniocentesis membrane rupturing, and capable of relieving the burden of medical staff.

The invention provides an improved safe and efficient membrane rupture device for the obstetrics and gynecology department and an application method, belongs to the field of medical instruments for the obstetrics and gynecology department and aims at solving the problem that an existing membrane rupture device in unsafe in use. The improved safe and efficient membrane rupture device for the obstetrics and gynecology department comprises a membrane rupture tube, a push rod, a baffle plate and a connecting rod, wherein a piston is fixed at the front end of the push rod; the outer wall of the piston is hermetically laminated with the inner wall of the membrane rupture tube; the front end of the connecting rod is connected to the bottom surface of the baffle plate; a liquid inlet hole is formed in the baffle plate; the outer edge of the baffle plate is hermetically laminated with the inner wall of the membrane rupture tube; a bumping post is formed at the center position of the top surface of the baffle plate; rod holes are formed in the piston and the push rod; the rear end of the connecting rod is movably arranged in the rod holes in a penetrating manner; spline teeth and spline grooves are arranged on the rod wall of the connecting rod and the hole walls of the rod holes; a baffle ring is fixed on the inner wall of the membrane rupture tube; the rear end of a membrane rupture needle is fixed on the inner edge of the baffle ring; a slide chute is arranged in the inner wall of the membrane rupture tube and extends along the circumferential direction and the axial direction of the membrane rupture tube; a locating groove is formed in the middle of the slide chute; and a slide block embedded into the slide chute is arranged on the outer edge of the baffle plate. The membrane rupture device is convenient to operate and safer in use.

The invention provides a safe and efficient membrane rupture device for the obstetrics and gynecology department and an application method thereof, belongs to the field of medical instruments for the obstetrics and gynecology department, and is intended to solve the problem that an existing membrane rupture device is unsafe in use. The safe and efficient membrane rupture device comprises a membrane rupture tube, an adjusting seat, a push rod and a membrane rupture needle, wherein the adjusting seat comprises an outer adjusting sleeve, an inner adjusting sleeve and an adjusting plate; a ventilation channel is arranged in the membrane rupture tube; an air hole is formed in the wall of the outer adjusting sleeve; the push rod extends into the membrane rupture tube from the rear end of the membrane rupture tube; a piston which is in movable fit with the inner wall of the outer adjusting sleeve hermetically is fixed at the front end of the push rod; a needle installation hole is formed in the wall of the front end of the outer adjusting sleeve; a needle installation groove is formed in one end of the needle installation hole corresponding to the outer wall of the outer adjusting sleeve; a magnetic stop block is fixed at the rear end of the membrane rupture needle and a needle tip is arranged at the front end of the membrane rupture needle; a needle hiding groove is formed in the inner wall of the membrane rupture tube along the radial direction; and a magnetic block is arranged at the bottom of the needle hiding groove. The membrane rupture device is safe in use and high in operation efficiency.

The invention discloses a disposable obstetrical membrane rupture device which comprises an air bag, a piston pump, a sucking pipe, a sucking disc and a puncture needle, wherein the sucking pipe is in a slender tubular shape, and the sucking pipe and the piston pump are integrated; the front end of the sucking pipe is connected with the bell-shaped sucking disc, and the back end of the piston pump is connected with the air bag; a piston is arranged in the piston pump, and one end, which is positioned in the sucking pipe, of a needle body is fixed on the piston; and a plurality of sucking holes arranged on the sucking disc are communicated with the sucking pipe. The distance between the piston and a step part in which the sucking pipe is connected with the piston pump is equal to the length of the needle body extending out the plain end of the sucking disk, i.e., the membrane rupture depth; since the distance is set when the device is shipped out of the factory, when the disposable obstetrical membrane rupture device is used, the extending length of a needle head, i.e., the membrane rupture depth is certain, thereby overcoming the defect that the depth of the needle head can not be preferably controlled by experience to injure fetuses when an ordinary membrane rupture device is used.