4207 results about "Internal cavity" patented technology

A urine collection device includes a collection member extending from a proximal end to a distal end. The proximal end includes an opening that provides access to an internal cavity of the collection member. The internal cavity includes a first chamber in fluid communication with a second chamber. The urine collection device includes a spacer in the second chamber, a first attachment member extending from a bottom wall of the collection member at the proximal end., a second attachment member extending from a top wall of the collection member at the proximal end, and an outlet for egressing urine from the internal cavity of the collection member. The first attachment member defines an aperture. The collection member is suitable to (i) direct urine from the first chamber to the second chamber and (ii) direct the urine in the second chamber distally toward the outlet.

A urine diversion device includes a diversion member extending from a proximal end to a distal end. The diversion member includes an opening that is configured to provide access to an internal cavity of the diversion member. The urine diversion device also includes a spacer in the internal cavity. The spacer includes one or more preferential separation regions in at least one of a first major surface or a second major surface. The urine diversion device also includes one or more attachment members configured to couple the diversion member to a user, and an outlet for egressing urine from the internal cavity of the diversion member. The diversion member is suitable to direct urine toward the outlet.

A device for collecting urine discharged from a body of a user includes a fluid collection assembly having at least one layer for drawing urine discharged from the body into an interior cavity, an external covering that covers a portion of the at least one layer, and at least one fenestration for receiving urine, wherein the fenestration is a portion of the fluid collection assembly that is uncovered by the external covering. The device further includes a cap enclosing a first end of the assembly, a tube having a first end in fluid communication with the cap, and a shape retaining element configured to conform the assembly to a curved configuration and maintain the curved configuration until the configuration is adjusted. The assembly is configured to be disposed against the body of the user, with the at least one fenestration in operative relation with a urethral opening of the user.

A device for in vivo surgery includes a cutting device rotatable by a hollow drive shaft, the cutting device being formed by a hollow anterior cutting region and a posterior region. The anterior region includes a plurality of longitudinal bore portions that are interconnected by laterally oriented cutting blade portions. The drilling portions are positioned at an angle to each other that together with the cutting blade define a conical mesh structure having a hollow interior cavity. The grid structure defines a plurality of ports between the drilling portion and the blade. A low-pressure region is formed within the hollow interior cavity, in which the cut obstructing material is drawn into the hollow interior cavity through a plurality of ports in the low-pressure region to further draw the obstructing material from the cutting device.

The present invention relates to the field of marine buoys, and in particular to a marine environment monitoring buoy platform, comprising a buoy body, a marine monitor arranged above the buoy body, and an ecological monitor arranged below the buoy body, a submersible assembly is arranged at the bottom of the buoy body, and the submersible assembly comprises a fixed box, a driving motor is fixedly arranged in the center of the inner cavity of the fixed box, and multiple groups of reel shafts are evenly arranged outside the driving motor, and the upper and lower ends of the reel shaft are rotatably matched with the fixed box, and the output end of the driving motor is provided with a driving gear, and a transmission gear is fixedly sleeved on the reel shaft, and the driving gear is meshed with the transmission gear, and a lowering rope is wound on the reel shaft, and one end of the lowering rope passes through the fixed box and is fixedly connected with a protective assembly. The present invention can achieve a fully surrounded and covered scouring effect on the outer wall of the ecological monitor, thereby effectively preventing marine organisms such as barnacles and oysters from parasitizing on the ecological monitor, which is beneficial to the monitoring process.

The present invention relates to an assembly structure of an open water pump and a cleaning machine, wherein a cover plate is arranged transversely in the middle of a volute and its edge is arranged close to the inner wall of the volute, and the inner cavity of the volute is divided into an upper cavity and a lower cavity, the bottom edge of the guide vane is supported on the inner bottom wall of the volute, and the semi-enclosed structure formed by the guide vane is arranged close to the inner wall of the volute opposite to the second water outlet and is detachably connected to the inner wall of the volute, and the second water outlet is close to the inner wall of the volute and is connected to the upper cavity. The semi-enclosed structure formed by the guide vane is offset relative to the center of the cover plate, and the offset structure cooperates with the spiral structure of the guide vane to pressurize the water flow together, reduce energy loss, and make the water flow pressure meet the pumping demand on the basis of simplifying the water pump structure; during assembly, the circumferential constraint position of the cover plate in the volute can be used to control the size of the connection area between the first water outlet and the second water outlet, thereby adjusting the size of each water flow after diversion to meet the user's unique cleaning needs.

The utility model provides an in-orbit microorganism culture experiment load, which comprises a load box body, a load box body and a load box body, the test module and the monitoring module are both installed in the box body space, the test module is composed of a plurality of culture units, and the monitoring module and the test module are oppositely arranged; the culture unit comprises a culture pond, a storage pond, an overturning film, a liquid conveying pipeline and a gas outlet pipeline, the storage pond is connected to the culture pond, and the overturning film is arranged in the storage pond to divide an inner cavity of the storage pond into a sealed liquid storage cavity and a sealed gas storage cavity; a liquid inlet of the culture pond is connected with the liquid storage cavity through a liquid conveying pipeline, and an air outlet of the culture pond is connected with the air storage cavity through an air outlet pipeline. The in-orbit microorganism culture experiment load provided by the utility model can realize accurate control and monitoring of a microorganism culture process in a microgravity environment, and through the integrated design, the experiment load can provide high-throughput experiment capability, and meanwhile, the safety and the reliability of an experiment are ensured.

The invention discloses a medical infusion pipeline pressure detection device which comprises a shell, symmetrical moving grooves are formed in an inner cavity of the shell, positioning mechanisms used for clamping and positioning an infusion pipeline are arranged in inner cavities of the moving grooves, symmetrical movable grooves are formed in the outer portion of the shell, inner cavities of the movable grooves are movably connected with push rods, and the push rods are movably connected with the movable grooves. A cavity is formed in the side wall of one side of the shell, a driving mechanism used for driving the positioning mechanism and the push rod to move is arranged in an inner cavity of the cavity, and when the driving mechanism rotates, the positioning mechanism horizontally moves towards the center position of the shell. The driving groove is driven to rotate anticlockwise through clamping fit of the driving block and the driving groove, the effect of driving the symmetrical clamping plates to clamp an infusion pipeline is achieved, the infusion pipelines of various sizes can be clamped and positioned, the infusion pipelines are stretched through the symmetrical stretching plates, the bending degree of the infusion pipelines is reduced as much as possible, and the production efficiency is improved. And the contact surface between the outer wall and the pressure sensor is wider.

The embodiment provides a ventilation structure of a drying machine and the drying machine. The ventilation structure of the drying machine comprises a case; the inner chamber is arranged in the case; the air supply assembly is arranged in the case, the air supply end of the air supply assembly faces the inner cavity, and the air supply assembly conveys hot air to the inner cavity; the cabinet door is arranged in the case and is used for controlling the opening or closing of the inner cavity; when the inner cavity is in a closed state, an exhaust gap exists between the inner cavity and the cabinet door, and hot air conveyed to the inner cavity by the air supply assembly is exhausted out of the drying machine from the exhaust gap. An air circulation channel formed by the ventilation structure penetrates through the whole inner cavity, the drying effect can be improved, meanwhile, the ventilation structure of the drying machine does not need to be additionally provided with ventilation holes in the inner cavity, and therefore design work of the drying machine is reduced, and production efficiency of the drying machine is improved.

The invention relates to the technical field of medical instruments, in particular to an oral cavity opening device clinically applicable to the stomatology department, and aims to solve the technical problems that an existing oral cavity opening device is simple in structure and single in function, the opening size cannot be freely adjusted, and meanwhile during examination, the opening size cannot be freely adjusted. In the prior art, medical staff need to observe pathological changes in the oral cavity of a patient with naked eyes, efficiency is low, and the risk of cross infection is brought to the medical staff. According to the technical scheme, the device comprises a fixing support, two positioning blocks are fixedly installed in an inner cavity of the fixing support, and a limiting rod is rotationally connected between the opposite sides of the two positioning blocks through a bearing. The oral cavity expanding device has the advantages that by arranging the expanding unit, the opening and closing degree of the oral cavity of a patient can be adjusted, by arranging the positioning unit, the expanding unit can be positioned, the use stability of the expanding unit is improved, by arranging the camera shooting mechanism, the oral cavity of the patient can be shot, and cross infection caused by visual inspection of medical staff is avoided.

The invention provides a control method of an intestinal tumor resection robot combining preoperative images and intraoperative navigation, and relates to the technical field of medical instrument control. The method comprises the following steps: acquiring preoperative multi-modal image data of the intestinal tract of a patient, and performing three-dimensional reconstruction on the image data to generate an initial three-dimensional model; dividing a navigation area in the enteric cavity according to the initial three-dimensional model; based on the core area, collecting a dynamic image of the intestinal tract inner cavity in real time through intraoperative navigation equipment, extracting anatomical mark points in the dynamic image, registering the dynamic image with the initial three-dimensional model, updating tissue deformation parameters in the three-dimensional model, and obtaining an updated three-dimensional model; on the basis of the updated three-dimensional model, obstacles in the intestinal tract are recognized, and the minimum space distance between the obstacles and the robot tail end instrument is calculated; and according to the spatial distribution and the minimum spatial distance of the obstacles, an initial motion path of the robot tail end instrument is planned. According to the invention, the efficiency and accuracy of the intestinal tumor resection operation can be improved.

The invention belongs to the technical field of burning detection. The invention provides a cavity structure for firing residue detection, a detection system and a detection method. The cavity structure comprises a test cavity assembly and an upper cover assembly, the test cavity assembly comprises a cavity shell, an inner cavity body and a lifting driving mechanism, the inner cavity body is arranged in the cavity shell, the output end of the lifting driving mechanism is connected with the inner cavity body to drive the inner cavity body to move up and down, and when the inner cavity body ascends and is matched with the upper cover assembly to complete sealing, an inner cavity space for accommodating the test cup and the sample placing disc is formed; when the inner cavity descends and is separated from the upper cover assembly, the test cup and the sample placing disc are exposed in an outer cavity space formed by the cavity shell and the upper cover assembly; the inner cavity body is provided with an inner cavity heating element for heating the inner cavity space, and / or the upper cover assembly is provided with an upper cover heating element for heating the inner cavity space; according to the invention, the problems of long heating time, poor temperature uniformity and low temperature control precision during detection of the firing residues are solved, and the detection precision of the firing residues is greatly improved.

The invention relates to the field of nursing instrument treatment, in particular to a nursing instrument disinfection system which comprises a containing box, a disinfection assembly and a refrigerating box, the containing box comprises a box body and a box cover rotationally connected to the upper portion of the box body, a closed cavity is formed in the box body after the box cover is covered, and two ventilation assemblies are arranged on the side wall of the box body; the disinfection assembly comprises a square pipe communicated with the refrigerating box, the two sides of the square pipe are connected with an air conveying pipe used for conveying steam and an air conveying pipe used for conveying dry cold air, a containing box with a closed cavity formed inside is designed, and the cavity inside the containing box is communicated with the outside only through the ventilation assembly under special conditions. After disinfection, the inner cavity of the placing box can be in a sterile environment for a long time, and nursing instruments can be stored easily. The disinfection assembly is arranged, disinfection and cooling can be automatically conducted, then the nursing instruments directly enter the refrigerating box to be stored, the containing box and the nursing instruments in the containing box do not make contact with outside air or any other objects in the whole process, and secondary pollution is avoided.

A protective umbrella and intracavity umbrella ribs are coaxially arranged on a conveying guide wire of the far-end embolism protection device, a supporting bracket of the protective umbrella is of a hollow structure, two first openings are formed in the near end of the supporting bracket and are symmetrically arranged along the central axis of the supporting bracket, and a covering film is fixed to the far end of the supporting bracket and wraps a part of the far end of the supporting bracket; a plurality of holes are formed in the covering film, the intracavitary umbrella ribs are located in the supporting support and are of a hollow structure, and second openings of the intracavitary umbrella ribs face the far end of the supporting support. The intracavity umbrella ribs and the covering film form a double-layer filtering structure, so that the situation that thrombus clots are accumulated in the inner cavity of the protection umbrella is effectively improved, the probability that meshes / micropores of the protection umbrella are blocked is reduced, and sufficient blood supply of a nervous system is ensured; the intracavitary umbrella ribs and the supporting bracket are coaxially arranged, so that the stability of the protective umbrella in the blood vessel is improved, the protective umbrella is not prone to inclination, and effective capture of free thrombus is ensured; the arrangement of the two first openings ensures that an effective capture channel can be provided even in an inclined condition.

The utility model relates to the technical field of edible fungi, and discloses a fungus cultivation box capable of controlling temperature, which comprises a thermotank body, a control end and a box door. Through cooperative use of the adjusting assembly and the fixing mechanism, a user opens a box door, pulls out a fixing rod, leaves the fixing rod from an inner cavity of a clamping groove, places a container on the top of a placing plate, and then starts an electric push rod, the electric push rod drives a movable rod to move, and the movable rod extrudes a movable block; after being stressed, the movable blocks drive the clamping plates to move and extrude the springs, the clamping plates make contact with the containers, then the fixing rods are reset, the fixing rods enter inner cavities of the clamping grooves, limiting is completed, and the problems that according to most existing edible mushroom culture constant-temperature boxes, the containers containing edible mushrooms are directly placed on the placing plates, the containers are not limited, and the edible mushroom culture constant-temperature boxes are not limited are solved. And when the constant-temperature box is subjected to external force, the constant-temperature box deviates and even topples over, so that the cultivation process is influenced.

The invention relates to the technical field of oil and gas well completion sand prevention, in particular to a sand blasting perforation and sand prevention integrated combined operation device and a construction method. According to the technical scheme, a central pipe is installed in the center of an inner cavity of a jet pump assembly, the lower end of the central pipe extends out of the jet pump assembly, a liquid suction opening is formed in the lower middle portion of the jet pump assembly, a liquid outlet is formed in the outer wall of an upper connector, and a mixing cavity and a diffusion cavity are formed between the jet pump assembly above the liquid suction opening and the central pipe. An outlet of the diffusion cavity is communicated with the liquid outlet; the inner side of the central pipe is movably connected with a lower sliding sleeve; a nozzle is mounted on the jet pump assembly outside the lower flow transfer hole; and the inner side of the upper flow transfer hole of the central pipe is movably connected with a middle sliding sleeve. The method has the beneficial effects that the three processes of sand blasting perforation, blockage removal after perforation and ground filling sand prevention are completed by tripping in the tubular column once, so that the times of tripping the tubular column and using ground construction equipment are reduced, the construction efficiency is improved, the construction cost is saved, and the well control risk in the construction process is reduced.

The utility model relates to a sediment filtering and settling water tank and relates to the field of settling water tanks. The device comprises a deflection assembly arranged in an inner cavity of the precipitation water tank, the deflection assembly comprises a supporting groove fixedly connected to the left side of the inner cavity of the precipitation water tank through bolts, an inner cavity of the supporting groove is rotationally connected with a connecting rod, and the surfaces of the front end and the rear end of the connecting rod are fixedly connected with first sector gears. A second motor is started to drive a rotating rod and stirring blades to turn and stir the bottom of an inner cavity of a precipitation water tank, so that precipitates at the bottom of the inner cavity of the precipitation water tank are loosened, meanwhile, a first motor is started to drive a connecting rod to deflect in an inner cavity of a supporting groove, and then a first sector gear drives a second sector gear to deflect; the inclined partition plate is driven to deflect upwards, so that the left side of the inclined partition plate is attached to the right side of the inclined edge plate, sediment at the bottom of the inner cavity of the sediment water tank can be discharged more smoothly, and meanwhile it can be guaranteed that clean water is not polluted.

The invention discloses a permeable hinged type ecological slope protection structure for sheltering benthonic animals in a canal. The permeable hinged type ecological slope protection structure is formed by distributing a plurality of slope protection blocks on a bank slope in an array mode. The slope protection block body is of an integrated structure and comprises an upper halfpace section and a lower rectangular enclosure frame section. An inner cavity of the slope protection block body is formed by a space enclosed by the lower rectangular enclosure frame section and a halfpace-shaped cavity in the upper halfpace section; lateral channels communicating with the inner cavity are formed in the left side and the right side of the slope protection block body, and the lateral channels on the two sides directly face each other. Through holes communicated with the inner cavity are formed in the top surface, the front side surface and the rear side surface of the upper halfpace section; the front side and the rear side of the lower rectangular enclosure frame section are respectively provided with a linkage hinge bayonet and a linkage hinge clamping block which are matched with each other; an induction adhesion layer is arranged on the top surface of the upper halfpace section; in the shoreline direction, the lateral channels of the adjacent slope protection block bodies are aligned and communicated; the adjacent slope protection blocks are clamped and matched in the direction perpendicular to the shoreline. According to the method, a relatively stable near-bottom shielding and slow-flow sheltering space can be formed, and habitat communication and attachment induction interface construction are considered.

The utility model relates to a suturing device. The suturing device comprises an outer sleeve and a suturing mechanism. A window allowing target tissue to enter is formed in the side wall of the far end of the outer sleeve, the window is communicated with an inner cavity of the outer sleeve, and the inner cavity is further used for being communicated with a negative pressure source. The suture mechanism is arranged in the outer sleeve and used for suturing the target tissue sucked into the window. When the suturing device is used for suturing a sampling channel, the suturing device extends into a preset part in the sampling channel to adsorb the target tissue on one side wall of the sampling channel, and the adsorbed target tissue protrudes out of the inner wall of the sampling channel; therefore, the suture mechanism can suture the target tissue sucked into the window. Therefore, a binding and pressing mode in the related technology does not need to be adopted, so that the rehabilitation time can be shortened, and the postoperative risk is reduced.

A fastening clip assembly is provided. It comprises a fastening clip, with a head portion to be positioned against a first surface of a component and a body portion for extending through the hole in the component, the body portion comprising an internal cavity and one or more elastically deflectable retaining members extending out of the internal cavity to engage a second surface of the component, opposite to the first surface, to retain the fastening clip assembly in the hole of the component, and an insert, configured to be inserted through an opening in the head portion of the fastening clip and into the internal cavity. The elastically deflectable retaining members are adapted to deflect inwardly in a deflecting direction as the body portion is pushed through the hole, and the insert comprises an engaging surface to engage an end of one of the elastically deflectable retaining members within the internal cavity, the end of the elastically deflectable retaining member comprising a bent section.

The invention discloses an installation device and an installation and disassembly method for a pipeline in an immersion cavity of an aero-engine, the installation device comprises a pull rod, a top sleeve, an expansion sleeve and a butterfly nut, the top sleeve is installed on an external thread of the expansion sleeve through an internal thread, and the pull rod penetrates through the top sleeve and the expansion sleeve and then is connected with the butterfly nut; the part, inserted into the top sleeve, of the expansion sleeve is of an opening forked structure. When the guide pipe is installed or disassembled, one end of the pull rod in a non-tensioning state and the opening bifurcated structure of the tensioning sleeve extend into the inner cavity of the guide pipe, and then the pull rod is pulled to enable the conical structure of the pull rod to enter the inner hole of the opening bifurcated structure to open the opening bifurcated structure so as to be attached to the inner cavity of the guide pipe and be tensioned. Further, the guide pipe is mounted in or taken out of the hole position of the immersion cavity through the mounting device, and when the mounting device needs to retreat and stop the guide pipe or push the guide pipe into a specific position, a fixed top sleeve or a movable top sleeve is adopted. The installation accuracy of the pipeline in the immersion cavity is optimized, the installation quality and efficiency are improved, and the leakage fault caused by the installation problem is avoided.

The invention relates to the technical field of medical instruments, in particular to a balloon delivery microcatheter and a using method thereof.The microcatheter comprises a handle, a balloon delivery pipe, a balloon delivery pipe and a balloon delivery pipe, the catheter body is connected with the handle, and the catheter body sequentially comprises a near-end tube, a balloon tube and a far-end tube from near to far; wherein the catheter body is of a double-cavity structure and comprises an inner cavity and an outer cavity, the inner cavity is a channel, one end of the inner cavity is communicated with the first connector, and the other end of the inner cavity penetrates to the end of the far-end tube and is used for conveying instruments, therapeutic drugs or diagnostic radiography liquid; one end of the outer cavity is communicated with the second connector, the other end of the outer cavity is communicated with the balloon tube, and the outer cavity is used for filling and pressure relief of the balloon tube. The balloon catheter has the functions of a micro catheter and a balloon catheter, a near-end blood vessel can be blocked, temporary blocking of local blood flow is achieved, the balloon catheter is further used for expanding the position, not attached to the wall, of an intravascular stent, the stent can be better attached to the blood vessel wall, and therefore pain and risks of a patient are reduced.

The invention provides a balloon catheter suitable for long vasculopathy, and relates to the technical field of medical instruments. The first balloon is arranged at the far end of the catheter body; the diameter of the near end of the first balloon is larger than that of the far end of the first balloon. A through inner cavity is formed in the middle of the catheter body, and a communicating channel communicating the first balloon with the inner cavity is formed in the side wall of the catheter body. By arranging the first balloon and the second balloon, the first balloon extrudes the second balloon after expanding, so that a contrast agent in the second balloon is gradually extruded out, the second balloon deforms, and the deformed second balloon is better attached to the narrow part of a blood vessel and can better adapt to the change of the inner diameter of a channel at a longer blood vessel.

The utility model discloses a tooth socket type oral irrigator which comprises an irrigating tooth socket, a circulating water pumping main machine and a water storage container, wherein the flushing tooth socket is used for sleeving the outer sides of maxillary teeth and mandibular teeth, a flushing inner cavity for accommodating the maxillary teeth and the mandibular teeth is formed in the flushing tooth socket, a water inlet interface and a water outlet interface are also formed in the flushing tooth socket, and the water inlet interface and the water outlet interface are respectively communicated with the flushing inner cavity; the circulating pump water main machine is connected with the water inlet connector and the water outlet connector. The circulating water pumping main machine is further connected with the water storage container and used for pumping water flow so that water in the water storage container can be pumped into the washing inner cavity from the water inlet connector and water in the washing inner cavity can flow back into the water storage container from the water outlet connector. According to the utility model, the teeth can be flushed by wearing the flushing tooth socket, so that the convenience of flushing the teeth can be improved.

The utility model provides a bone drill, including a protective shell, a drive shaft, an inner ring cutting blade and an outer ring cutting blade; the protective shell has a containing inner cavity and a clearance gap laterally connected to the containing inner cavity, and the clearance gap also extends to the end of the protective shell; the drive shaft passes through the head end of the protective shell to extend into the containing inner cavity, the inner ring cutting blade and the outer ring cutting blade are arranged in the containing inner cavity of the protective shell and assembled on the drive shaft, the drive shaft, the inner ring cutting blade and the outer ring cutting blade are distributed in sequence from the inside to the outside and are coaxially arranged, and the inner ring cutting blade and the outer ring cutting blade are partially exposed in the clearance gap. In this way, a bone block of a set shape can be directly cut out without additional processing, and bone material is saved; at the same time, the area that does not need to be cut is blocked by the protective shell, and the protective shell can well protect the soft tissue from being scratched.

The invention belongs to the technical field of irrigation equipment, and discloses an anti-blocking water pumping pipe head device for irrigation, which is technically characterized by comprising a water pumping pipe and a protective cover, a filter plate is fixedly mounted in an inner cavity of the water pumping pipe, a central shaft is arranged below the filter plate, and a rotating assembly connected with the central shaft is arranged in the inner cavity of the water pumping pipe; an outer anti-blocking mechanism is arranged on the surface of the protective cover, the outer anti-blocking mechanism comprises a cutting assembly and a driving assembly, an inner anti-blocking mechanism matched with the filter plate is arranged in an inner cavity of the water pumping pipe, and the inner anti-blocking mechanism comprises an inner cutting blade, a supporting assembly, a swing assembly and a rolling assembly. And by arranging the cutting assembly to be matched with the driving assembly, the aquatic plants attached to the outer side of the protective cover can be efficiently and automatically smashed, the situation that the protective cover is blocked by the aquatic plants is effectively avoided, and the water pumping efficiency of the water pumping pipe is effectively improved.

The present invention relates to a hydraulic tool. The present invention comprises a connecting rod, a connecting piece with an internal cavity detachably fixed to both ends of the connecting rod, a sealing component detachably fixed to the connecting piece and having a built-in cavity connected to an external hydraulic device, the sealing component being fixed to the outer end of the connecting piece opposite to the connecting rod, the built-in cavity being connected to the internal cavity, and the internal cavity having at least one water outlet hole connected to the outside of the connecting piece. The present invention solves the technical problem in the prior art that it is difficult to seal the pipe orifice of the connecting pipe when the inner pipe section of the pipe orifice is short and no block is provided on the outer wall of the pipe orifice, and provides a hydraulic tool for the heating surface tube screen of a waste heat boiler. The present invention has the advantages of simple structure, safety, reliability and ease of use.

The utility model relates to the technical field of emulsion pumps, and discloses a double back-suction type all-plastic emulsion pump which is of an all-plastic structure and comprises a pump body, a pressing head, a main column, an auxiliary column, a spring, a one-way ball valve, a piston and a back-suction rod. The main column is provided with a back suction cavity located between the inner wall of the main column and the outer wall of the auxiliary column and communicated with the pressing head. The piston movably sleeves the auxiliary column in a sealing manner, is movably connected with the inner wall of the pump body in a sealing manner, and is movably connected with the inner wall of the lower end of the main column in a sealing manner to seal and close the lower end of the back-suction cavity; and the upper end of the resorption rod is movably and hermetically nested in the secondary column. According to the double back-suction type all-plastic emulsion pump, a double back-suction structure or a back-suction structure can be formed between the main column and the piston and between the auxiliary column and the back-suction rod, materials of the pressing head can be quickly sucked back or back into the back-suction cavity and the inner cavity of the auxiliary column, the back-suction space is large, the back-suction efficiency is high, and the back-suction effect is good. The problem of waste or pollution caused by residual feed liquid after the liquid is discharged from the pressing head is solved, and the use is cleaner, more environment-friendly and more sanitary.

The invention discloses a double-balloon type left ventricle auxiliary device which comprises an inlet tube, an outer balloon, an elastic support, an inner balloon, a catheter and a connecting piece. The inlet pipe is provided with a plurality of inflow windows and a one-way valve for controlling one-way flow of blood; the outer balloon has a folded state and an expanded state, in the conveying process, the outer balloon is in the folded state and can be contained in the conveying sleeve, and when the outer balloon reaches a designated position, the outer balloon is in the expanded state; the elastic support is attached to the surface of the external balloon, the elastic deformation of the elastic support enables the external balloon to be switched between a folded state and an expanded state, and the elastic support can provide radial supporting force in the expanded state, so that the external balloon is expanded and keeps a fixed volume; the internal balloon is arranged inside the external balloon, and contraction and expansion are realized by injecting gas or liquid, so that the volumes of inner cavities of the internal balloon and the external balloon are periodically changed, and the internal balloon and the external balloon are used for sucking and discharging blood; the catheter is provided with a medium cavity and a guide wire cavity, and the medium cavity is communicated with the internal balloon.

The utility model discloses a double-suction double-discharge reciprocating injection pump which comprises a pump body, a liquid inlet pipe and a liquid outlet pipe, two pistons are arranged in an inner cavity of the pump body at intervals in the length direction, the two pistons are movably assembled with the inner cavity of the pump body in a sealing mode, and the inner cavity of the pump body is divided into a first closed cavity, a sterilization air cavity and a second closed cavity by the pistons, a linkage rod located in the sterilization air cavity is arranged between the two pistons; one end of the pump body is provided with a first interface and a second interface which are respectively communicated with the first closed cavity, the other end of the pump body is provided with a third interface and a fourth interface which are respectively communicated with the second closed cavity, the first interface and the third interface are both communicated with the liquid inlet pipe, and the second interface and the fourth interface are both communicated with the liquid outlet pipe; one-way valves are arranged in the first connector, the second connector, the third connector and the fourth connector respectively. The liquid balance device can solve the problem of liquid balance of continuous blood purification equipment in a vibration impact environment of a moving occasion, simplifies the principle, and improves the reliability.