170results about How to "Avoid secondary damage" patented technology

The invention provides an upper-limb rehabilitation device of half-exoskeleton, including a base, a control system, a dynamical system, an input/output device, and a first movement combination or a second movement combination; the base is used to place the dynamical system and support the control system, the input/output device and the first or the second movement combination; the control system is used to manage the training data collected by the rehabilitation device; the dynamical system is used to provide driving force for the first or the second movement combination; the input/output device is used to input the training instruction of users and display the generated data during training; the first or the second movement combination is used to complete the upper-limb movement cooperating with users. The upper-limb rehabilitation device of half-exoskeleton can avoid the deviation of the motion trail and the pose between the moving body of the rehabilitation device and human body (the upper limb), prevent patients from suffering a secondary damage during their rehabilitation training, and improve the security and validity of rehabilitation movements.

The invention relates to a seat for helping users get up. The seat includes a bottom frame and a seat board, the bottoms of the two sides of the seat board are connected with the first ends of first connection rods in a fastening mode respectively, the second ends of the first connection rods are hinged to the first ends of second connection rods, and the second ends of the second connection rods are hinged to the front portion of the bottom frame; the front portion of the bottom frame is also hinged to the first ends of third connection rods, the hinged points of the first ends of the third connection rods are located above the hinged points of the second ends of the second connection rods, and the second ends of the third connection rods are hinged to the first connection rods; the rear portion of the bottom frame is hinged to the first end of a linear driving device, and the second end of the linear driving device is hinged to the first connection rods. According to the seat for helping the users get up, the linear driving device and a connection rod mechanism drive the seat board to achieve height change and inclination angle change so as to help people with limited activity get up, the users can get up almost without effort, and the seat not only is convenient to use, but also avoids secondary damage, and is thus safer.

The present invention provides method of generating a 3-D image of at least one cement bolus in relation to a bone comprising acquiring a plurality of fluoroscopic images of the bolus during or after a bone cement injection procedure. The method further comprises registering each fluoroscopic image with a CT scan image of the bone. Additionally, the method comprises outlining the bolus in each fluoroscopic image to generate a plurality of silhouettes of the bolus. The method also comprises projecting the silhouettes on to the CT scan image to generate a plurality of back-projections. Moreover, the method comprises identifying a plurality of bolus voxels to generate the 3-D image of the bolus, wherein each bolus voxel comprises an intersection of at least two back-projections. Furthermore, a method for intra-operative imaging of at least one bolus of bone cement during a bone cement injection procedure is disclosed.

The invention relates to an asphalt cement mortar stirring main machine comprising a stirred tank body the bottom of which is provided with a discharge gate mechanism, a power device and a stirring device. The stirring device comprises two parallel stirring shafts arranged in a stirring tank horizontally. The asphalt cement mortar stirring main machine is characterized in that: a plurality of spiral stirring arms are fixedly connected with the two stirring shafts; stirring blades with via at the two sides of the middle part are respectively arranged at the ends of the stirring arms; the stirring blades on each stirring shaft are roughly arranged in a variable angel and spirally in the space; the stirring blades on the two stirring shafts axially arranged along the opposite spiral direction and the two spirals are intersected; the power device comprises a driving motor with the speed adjustable, which synchronously drives two stirring shafts through a transmission device. In the stirring device, a dual horizontal form is employed which is characterized in that the stirring arms and the stirring blades, an asymmetric spiral distribution is employed so as to avoid secondary breakup of mixed materials and precipitation and fossilization of large particles in the stirring as well as meet the quality requirement that the asphalt cement mortar perfuses a grout layer of a high-iron track plate without slag.

The invention discloses a cardiopulmonary cerebral resuscitation rescue device in emergency internal medicine, and relates to the technical field of medical emergency equipment. The device comprises abed body, wherein two sliding grooves are formed in the upper surface of the bed body, sliding blocks are slidably connected in the sliding grooves, the upper surfaces of the sliding blocks are fixedly connected with the bottom ends of electric push rods, and the top ends of the two electric push rods are fixedly connected to the lower surface of a second supporting plate respectively. The cardiopulmonary cerebral resuscitation rescue device in the emergency internal medicine has the advantages that through the arrangement of the bed body, the sliding grooves, the sliding blocks, the electricpush rods, a carrier plate, a cushion block, a motor, a stepless governor, a rotating shaft, a cam, a first supporting plate, a groove, a push rod, a first sliding sleeve, a second sliding sleeve, apressing device, a spring, a second supporting plate, a power source, a first switch and a second switch, the device can be directly pulled to the position above the heart of a patient to directly perform cardiopulmonary cerebral resuscitation on the patient, thereby saving the time for rescuing the patient, and avoiding the secondary damage to the patient during movement.

The invention provides a relay control circuit which can avoid arc discharge of relays and timely disconnect high tension loops when vehicles collide. The control circuit comprises a power supply (1), an output end of a main relay (2) and a load (3); wherein, the components are sequentially connected in series; an input end of the main relay (2) is connected with a switch (4) capable of controlling pull-in of the main relay (2). The key lies in that the output end of the main relay (2) is connected with a precharging circuit in parallel; the precharging circuit is formed by series connection of a precharging relay (5) and current-limiting resistance (6); the precharging relay (5) is connected with a switch (11) which controls pull-in of the precharging relay (5); the output end of the main relay (2) is connected with a charging capacitor (7) in series; the charging capacitor (7) is connected with the load (3) in parallel; the input end of the main relay (2) is also connected with a protective circuit (8) which can control the disconnection of the main relay (2) when vehicles collide.

The invention belongs to the field of furnace lining repairing, and particularly relates to a furnace lining gap repairing material and a furnace lining gap repairing method. The furnace lining gap repairing material provided by the invention comprises the following components: 25 to 40 wt% of inorganic fibers, 2 to 10 wt% of an expansion filler, 2 to 15 wt% of refractory powder, 10 to 20 wt% of abinding agent and 30 to 60 wt% of a solvent, wherein the inorganic fibers comprise one or more selected from the group consisting of glass fibers, rock wool fibers, aluminum silicate fibers, magnesium silicate fibers, calcium silicate fibers, zirconium-containing fibers and aluminum oxide fibers; and the expansion filler comprises one or more selected from the group consisting of expanded perlitepowder, expanded vermiculite powder, expanded kyanite powder and sillimanite powder. The composition of the furnace lining gap repairing material is optimally designed, and particularly, proper typesof the inorganic fibers and the expansion filler with proper usage amounts are matched and selected, so the repairing material has a very excellent furnace lining gap repairing effect, and effectively prolongs the service life of a furnace lining.

The invention belongs to the technical field of petroleum engineering, and relates to a detonation gas rock breaking experimental device and method. The detonation gas rock breaking experimental device is characterized in that: two upper cover plates are arranged at the upper end of a cylinder body; an upper piston is mounted below each upper cover plate; lower cover plates are arranged at the lower end of the cylinder body; a lower piston is mounted above each lower cover plate; a sample is placed between each upper piston and the corresponding lower piston; a sample central hole is formed between the samples; compression bolts are arranged on the upper cover plates; compression bolts and pressure measurement bolts are arranged on the lower cover plates; a water injection hole is formed in the top end of one upper cover plate; an ignition element assembly is mounted in the middle of the cylinder body, and sequentially penetrates through the upper cover plates, an upper piston central hole, the sample central hole and a lower piston central hole; a pressure measurement sensor is arranged at the bottom end of the ignition element assembly, and is mounted in the lower cover plates in an embedded manner; supporting rods are mounted at the bottoms of the lower cover plates. According to the detonation gas rock breaking experimental device and method, the structure is simple, the theory is scientific, the operation is convenient, and the experimental data is accurate.

The invention provides an antiseptic and anti-inflammatory wound repair dressing. The antiseptic and anti-inflammatory wound repair dressing comprises a backing layer, a composite antibacterial layerand a hydrophobic skin clinging layer, wherein the backing layer is a film which is prepared from a biodegradable polymer material, procyanidine and allantoin are loaded on a hydrophobic porous film,and the loading hydrophobic porous film is wrapped by a buffering nanofiber layer so as to prepare the composite antibacterial layer, and the buffering nanofiber layer is prepared from honey, citric acid and a hydrophilic polymer material; and the hydrophobic skin clinging layer is prepared through mixing one of a hydrophobic material polylactic acid and polycaprolactone with chitosan. The invention also provides a preparation method of the antiseptic and anti-inflammatory wound repair dressing. Not only can the prepared antiseptic and anti-inflammatory wound repair dressing be degraded and absorbed in vivo so as to achieve an anti-inflammatory and antibacterial effect, but also the stability and slow release of the procyanidine and allantoin in the wound repair dressing can be ensured, sothat the application scope of the procyanidine and allantoin is expanded.

The invention relates to a transformer explosion preventing composite device and an explosion preventing control method and aims to solve the problems that the fire extinguishing effect is bad and the like when conventional transformers are on fire. The device comprises a frame, a transformer component, a transverse frame, high voltage wires, detecting modules and a control module, wherein the control module is connected with a high voltage wire cutting mechanism; a plurality of explosion preventing walls are arranged on the periphery of the transformer component and connected with a lifting driving structure; a plurality of sensing modules are arranged at one sides, which are close to the transformer component, of the explosion preventing walls and connected with the control module; and the control module is respectively connected with a plurality of fire extinguisher nozzles which are arranged at one sides, which are close to the transformer component, of the explosion preventing walls. The device has the advantages that power supply can be automatically cut off; the explosion preventing walls are liftable; no disturbance is caused to the maintenance of the transformer; the explosion preventing walls can be automatically lifted to surround the transformer component when the transformer component is on fire; in the meantime, targeted fire extinguishment is carried out by means of the fire extinguishers arranged inside the explosion preventing walls; and the fire extinguishing effect is good.

The invention discloses a finger rehabilitation robot with adduction and abduction functions, and relates to the technical field of rehabilitation medical equipment. The robot comprises a rack, a four-finger flexion/stretching exercise assembly, a four-finger adduction/abduction exercise assembly, a thumb exercise assembly and a forearm supporting assembly; the four-finger flexion/stretching exercise assembly comprises a linear sliding table bottom plate, a flexion and stretching motor and a lead screw nut mechanism; a finger motion track restraining plate is arranged on the upper portion of alead screw of the lead screw nut mechanism; the four-finger adduction/abduction exercise assembly comprises an adduction and abduction motor, a swinging driving plate, a short connecting rod and a long connecting rod; the thumb exercise assembly comprises a thumb exercise motor, a thumb exercise driving belt wheel, a thumb exercise synchronous belt, a thumb exercise driven belt wheel and a thumbsleeve component. The robot can achieve four-finger flexion/stretching exercise and four-finger adduction/abduction exercise, is good in mechanism flexibility, cannot cause secondary injury, and is good in rehabilitation effect and high in cost performance.

The invention discloses a rescue device and method based on a helicopter. The rescue device comprises the helicopter and a hanging basket. The helicopter is provided with a controller, a control wire and a cable. The hanging basket is provided with an underwater infrared camera, a power pump, air bags, an air bag control motor, a rotation-angle motor and motor hinges. The underwater infrared camera is used for shooting the underwater surrounding environment of a person in distress in real time and sending the obtained underwater pictures to the controller. The controller analyzes and processes the received pictures and then controls the power pump to work, so that the hanging basket moves to be close to the person in distress for rescue activity. The air bags help the hanging basket to float out the sea, and secondary damage in the lifting process can be avoided. The motor hinges enable the four walls of the hanging basket to be in a three-dimensional state from a tiled state, so that the person in distress is fixed into the hanging basket and prevented from sliding out of the hanging basket. The invention further discloses a rescue method based on the helicopter. By means of the rescue device and method, offshore rescue efficiency is improved, and health of rescue staff is improved.

In allusion to deficiency of an existing technology, the invention provides a six degrees of freedom wearable flexible-rope-driven exoskeleton-type upper limb rehabilitation training robot. A rope driving mode is adopted, a device is small in inertia, a whole system has movement consistency and fluency, and secondary injury to a patient is avoided; in addition, a degree of freedom needed by a joint is realized without a larger mechanism, such as a joint turntable, a space utilization ratio is high, wearing is more comfortable, more portable, and more suitable for kinetic characteristics of a human arm; and the robot has six driving degrees of freedom, and all-dimensional safe reliable rehabilitation training can be provided for upper limb dysfunction people. The composition of the providedsix degrees of freedom wearable flexible-rope-driven exoskeleton-type upper limb rehabilitation training robot comprises a ground support part and a wearable part, wherein an upright column in the ground support part is connected to the ground, and an arc guide rail module in the ground support part is connected with a big arm fixing device in the wearable part.

The invention discloses a device for controlling an endoscope. The device for controlling the endoscope comprises an endoscope having a puncture point O matched with a human body, and a rotating unit,a swinging unit and a zooming unit which are matched with the endoscope, thereby being capable of rotating along Ox and Oy respectively and performing reciprocating motion along the axis Z, wherein one end of the swinging unit is matched with the rotating unit, and the other end of the swinging unit is connected with a synchronous swing arm mechanism adopting passive synchronous driving through two rotating joints on the swinging unit, so that the swinging direction of the swinging unit is always parallel in space; the synchronous swing arm mechanism is connected with the zooming unit throughrotating points on the synchronous swing arm mechanism at one end matched with the endoscope. According to the device for controlling the endoscope provided by the invention, a swing arm of the swinging unit is driven to be consistent with a swinging angle of the zooming unit by arranging the synchronous swing arm mechanism to resist torque caused by centers of gravity of the zooming unit and connecting devices which are matched with the zooming unit such as a gripper and the endoscope in real time.

The invention provides a health-care ice pillow, which includes a pillow case and a pillow core. A heat conduction plate abutting against the pillow core is also provided in the pillow case. Support columns are provided at the four corners of the lower surface of the heat conduction plate, and a There is a cooling system, the cooling system includes a heat exchange component fixed on the lower surface of the heat conduction plate, a cooling water tank installed in the pillowcase, the cooling water tank is provided with a water outlet pipe and a return pipe, and the water outlet pipe and the return pipe are connected to the heat exchange pipe respectively. The components are connected, and the outlet pipe is provided with a micropump, and the cooling water in the water tank is transported to the heat exchange component by the pump, exchanges heat with the pillow core, and then returns to the water tank. The two-in-one design of sleeping pillow and ice pillow avoids moving the patient when the patient needs to be iced, and effectively prevents secondary injury to the patient; cooling uses circulating cooling water to perform physical heat exchange in the heat exchange component The method avoids the patient's body being directly exposed to low temperature, plays a palliative role, and prevents the disadvantages of blood clogging that may be caused by too low temperature.

The invention relates to a method for manufacturing and controlling the camber of a crane main girder, and belongs to the technical field of crane structure manufacturing. The method comprises the steps that a web plate is welded to a connecting plate according to the longitudinal length and is cut and formed according to the reserved camber, all longitudinal long ribs on the web plate and the web plate are assembled and welded in place, an upper jig frame and a base plate are assembled after shaping and flattening are carried out, an inner transverse partition plate and the web plate are welded, longitudinal welding joints of the web plate and the base plate are formed, welding should be completed from the middle to the two sides gradually so as to control welding deformation, and the two sides of the girder are symmetrically welded to form the U-shaped girder. The method has the advantages that excessive materials and defective materials are used for manufacturing so that resources can be recycled and the cost can be saved; due to the rigid connection of the structure and the jig frame and the reserved camber value of the jig frame, the structural forming precision is completely controlled, secondary damage of flame distortion rectification to materials is avoided, and the welding sequence is reasonable.

The invention discloses a no-shutdown online mandatory polishing method of a rotary kiln supporting shaft and supporting roller, and belongs to the technical field of maintaining method of supporting shafts and supporting rollers. According to the technical scheme, the method includes (1) mandatorily injecting water to a heat shaft and roller for cooling; (2) injecting lubricating oil after cooling for mandatory lubricating, and polishing heat drawing points of the shaft and roller in a no-shutdown on-line manner through a piece of 0# waterproof abrasive paper and a piece of liner with oil alternately simultaneously; (3) after polishing, adopting a circulate cooling oil pump to inject gear oil to a damaged support to perform circular lubrication, washing and secondary polishing for 36 to 60 hours, changing with fresh oil, and allowing equipment to resume to operate normally. The no-shutdown on-line mandatory polishing method of the rotary kiln supporting shaft and supporting roller is safe and reliable; on conditions that the supporting shaft and supporting roller is not broken, the method is realized in an on-line manner with constant speed and secondary pollution occurs rarely, and is applied to on-line maintenance of the rotary kiln supporting shaft and supporting roller.

The invention discloses a sickbed with a turnover function, which relates to the technical field of sickbed nursing equipment and solves the problems that manual turning workload is large, and a patient may suffer from secondary damage caused by unstable turnover. The sickbed comprises a sickbed body, lifting mechanisms are arranged at the bed head and the bed tail of the sickbed body, turnover devices connected and matched with the lifting mechanisms are arranged above the sickbed body, each turnover device comprises a turnover plate and a fixing frame arranged at the periphery of the turnover plate in a sleeving manner, rotating shafts matched with the fixing frame are arranged at two ends of the turnover plate, the fixing frame is provided with a rotary power device matched with the rotating shaft, the center of the turnover plate is provided with a notch used for containing a patient, and a gripper mechanism used for fixing the patient is arranged inside the notch.

The invention discloses a medical transfer bed for critically ill patients, which comprises a moving seat, a support plate, rollers and a lifting device; rollers are installed on the bottom of the moving seat, and fixing devices are arranged on both sides of the bottom of the moving seat, and the fixing device includes Fixed plate, rotating shaft, friction pad, anti-slip protrusion, through hole, mounting seat and threaded hole; slide block is installed slidingly in the chute, the upper surface of slide block is fixedly connected with horizontal first bed board, and inside the first bed board is provided with cavity, a horizontal second bed board is inserted into the inner cavity, a bearing is installed on the second bed board, and a screw rod is fixedly installed on the bearing. In the present invention, the second bed board is inserted into the first bed board to separate the bed board from the human body without directly lifting the patient, ensuring safety during transfer and avoiding secondary injuries; the fixing device can make the whole bed Keep it fixed, avoid human pushing and affect the position, ensure the safe transfer and improve the stability of use.

The invention discloses a joint movement assist device independently assisting a joint, comprising at least one auxiliary structure set.Each auxiliary structure set comprises: at least one freely telescopic airbag; at least two transfer fasteners fastening part of the airbags at two ends and fixing the fastened part of the airbags; at least one corrugated part located between two transfer fasteners on the airbags and not fastened in the part of airbags fastened by the transfer fasteners, wherein the corrugated part telescopes and produces force assisting in joint movement at the premise that the corrugated part is arranged around a joint axis in a direction approximately perpendicular to the joint axis; a distributing tube, one end of which is detachably connected with the airbag and the other end of which is connected with an adjusting portion to adjust air pressure in the airbags; a first wearable portion.In this manner, the joint of a user can be assisted independently, and secondary injury caused by assisting in unmovable joints of the user is avoided.

The invention provides a medical bed structure. The structure includes a bed body and a mattress assembly arranged on the bed body, wherein the mattress assembly includes an upper bed board and a lower bed board which are arranged on the upper position and the lower position, the bottom surface of the upper bed board is a bevel and provided with a sliding rial, the top surface of the lower bed board is also a bevel and provided with a sliding groove, and the upper bed board can slide in a side direction opposite to the lower bed board; the side borders of the two ends of the top surface of the upper bed board are provided with assembling grooves respectively, each assembling groove is internally provided with a locking mechanism, a first pin hole is formed in the center of the bottom of each assembling groove, a second pin hole coaxially corresponding to the first pin hole is formed in the lower bed board, each locking mechanism comprises a locking pin capable of being inserted into the first pin hole and the second pin hole and a handle fixedly connected to the top surface of the locking pin, and by pressing and rotating the handles, the upper bed board and the lower bed board can be relatively and tightly locked and can not move. According to the medical bed structure, since the upper bed board in the mattress assembly can slide in the side direction opposite to the lower bed board, a patient can be conveniently transferred from a transferring bed of an operation room to a normal hospital bed of a normal ward.

The invention discloses a medical head fixing device. The medical head fixing device comprises an operation box, an arc positioning plate is fixedly arranged on the opening of the operation box, and an arc clamping block is fixed to the end, away from the operation box, of an L-shaped connecting rod; a sliding block is fixedly connected to the end, away from the arc clamping block, of the symmetrical L-shaped connecting rod, a limiting block is connected with the sliding block through a spring, the end, away from a rotating plate, of a first connecting rod is fixed to the center of a pulley, apull rope is fixedly connected to the pulley, the end, away from the pulley, of the pull rope is fixedly connected to the sliding block, a driving gear is movably engaged between symmetrical passivegears, a driven bevel gear is connected to the center of the driving gear through a connecting block, and the driven bevel gear is movably engaged with a driving bevel gear. According to the medical head fixing device, patients with different head sizes can be precisely adjusted, the patients are prevented from secondary injury caused by head offset, the device height can be adjusted, operation issimple, and the medical head fixing device is worth popularizing.

The invention designs a rotary anti-collision bucket and belongs to the technical field of traffic safety facilities. The rotary novel anti-collision bucket is composed of a magneto-rheological buffering module, a power generation module, a storage battery and a LED module, and the novel anti-collision bucket integrates energy absorption and energy storage and can better protect buildings and reduce vehicle loss. The novel anti-collision bucket is a cylinder, a shell is made of a flexible material, the magneto-rheological buffering module composed of circular magneto-rheological energy absorbers is arranged on the inner side of the shell, a circular liquid flow power generator is mounted on the inner side of the magneto-rheological buffering module, a solar panel made of a flexible material is arranged at the top of the anti-collision bucket, and space at the top is utilized for solar power generation; the liquid flow power generator, a rotary power generator and the solar panel form the power generation module, parts, except for a hollow cavity, of a base column are solid, the base column is connected with a base frame on the ground, and an LED lamp is mounted on a cross rod at the upper end of the frame. The novel anti-collision bucket can better protect buildings and vehicles and has more obvious effect than conventional anti-collision buckets.

The invention provides a chemotherapy drug pulse sustained-release implant agent and a preparation method thereof. The sustained-release implant agent comprises a chemotherapy drug active component such as any one of gemcitabine, gemcitabine hydrochloride, doxorubicin, 5-fluorouracil, cisplatin, carboplatin and paclitaxel, and an excipient such as a polylactic-glycolic acid copolymer. The preparation method provided by the invention comprises the following steps of: evenly mixing the chemotherapy drug active component with the excipient in a solvent, and then drying the mixture of the chemotherapy drug active component and the excipient in a vacuum after removing the solvent; and then sequentially crushing, sieving, melting and blending the mixture to obtain the sustained-release implant agent. The sustained-release implant agent provided by the invention has the advantages that a second drug release is carried out after tumor growth is controlled by a first drug release for a certain period, and the local effective concentration of a drug is effectively increased, so that the effect of administering once and releasing twice is achieved, and the side injury caused by secondary drug implanting is avoided.

A device for detecting appearance of an intelligent equipment protective cover plate includes a camera adjustment assembly provided with a camera and a lens, a high-speed linear motion assembly, an imaging triggering sensor assembly and an industrial personal computer, wherein the camera adjustment assembly can adjust a camera position and posture with six degrees of freedom, the camera and the lens are used for imaging a to-be-detected cover plate; the high-speed linear motion assembly includes a vacuum adsorption combination body which can adsorb the cover plate, so as to drive the cover plate to move at high speed; the imaging triggering sensor assembly is used for induction of a cover plate incoming material; the industrial personal computer is used for processing and recognition of acquired images. The device realizes adsorption high-speed detection of the cover plate by the vacuum adsorption combination body, and greatly reduces risk of secondary damage of the cover plate.

The invention provides a medical transport bed. The medical transport bed comprises a rectangular framework, wherein convex edges are arranged on the inner peripheries of the framework, a support board is arranged on the convex edges, sliding chutes are arranged in the two ends of the support board, sliding bars are embedded in the sliding chutes, and clamp blocks are distributed on the top ends of the sliding bars; the medical transport bed further comprises a bed board, wherein clamp grooves matched with the clamp blocks are formed in the bottom end of the bed board, the lower end of the framework is connected with a hydraulic cylinder through a bracket, shaft tubes are arranged on two ends of the edge part of the framework, gaps are formed in the top ends of the shaft tubes, a shaft rod is arranged in the shaft tubes, clamp plates matched with the gaps are arranged on the two ends of the shaft rod, and a guard bar is arranged at the position, between the two clamp plates, of the shaft rod. According to the medical transport bed, after the height of the support plate is adjusted through the hydraulic cylinder, the bed board extends towards a bed body in a ward through the matching between the sliding chutes and the sliding bars, so that a patient can be conveniently placed on the bed body, and therefore, the secondary injury caused to the patient is avoided; through the matching between the shaft rod and the shaft tubes, the use of the guard bar is facilitated.

The invention relates a wound protective support. The wound protective support has the advantages that a safeguard space is provided around a wound to avoid secondary damage to the wound; the wound iskept dry and airy, and wound healing is quickened; dressing changing and wound checking are facilitated; it is avoided that a patient unconsciously scratches the wound crust due to itching upon woundhealing; as shown by . 1 and. 2, the wound protective support comprises a protective cover 1, a base 2 and absorbent gauze 3, wherein the protective cover is of arch structure, having bottom edges positioned in a same plane, and the top and bottom planes parallel to each other, the protective cover is made with a hard material, the top of the protective cover is provided with air holes 11, the base 2 is in ring shape and is made with a hard material, the bottom edges are in a same plane, the bottom edges are coated with silicone, and the absorbent gauze 3 is in ring shape and is applied around the wound. One side of the protective cover 1 is hinged to the base 2, and the other side of the protective cover 1 is connected to the base 2, and the base 2 is arranged on the absorbent gauze 3 toavoid bacterial breeding due to direct contact with skin.

The invention discloses a sand maker provided with a crushing roller gap adjusting mechanism and relates to the technical field of sand making equipment and solves the problem that the sand maker is limited in application range, poor in performance of the gap adjusting mechanism and poor in durability. The sand maker provided with the crushing roller gap adjusting mechanism comprises a stock bin, a feed inlet, a discharge opening, a fixed roller, a movable roller and a motor cabin, wherein the feed inlet is located in the top of the stock bin, the discharge opening is formed in the bottom of the stock bin, the fixed roller, the movable roller and the motor cabin are mounted in the stock bin, a motor and a master controller are arranged in the motor cabin, a gear transmission box is arranged in the stock bin, and the gap adjusting mechanism is arranged on the movable roller. The sand maker provided with the crushing roller gap adjusting mechanism has a function of adjusting the gap. On the one hand, the sand maker can process sandstones of various specifications, and on the other hand, the sand maker is simple and convenient to maintain when the sand maker is jammed. The sand maker is high in reliability and long in service life.

The invention provides a lower limb joint rehabilitation training device which is suitable for left and right lower limbs at the same time, easy to adjust according to different heights, light and foldable. The device can well simulate rotation flexion and extension movement of the hip joint and the knee joint of the human body, and is particularly suitable for rehabilitation training of a patientafter knee joint replacement surgery, hip joint replacement surgery, ligament surgery, lower limb nerve surgery and the like.

The invention discloses a three-layer bionic skin scaffold based on a 3D printing technology and a preparation method of the three-layer bionic skin scaffold, and belongs to the technical field of tissue engineering. The skin stent is divided into three layers, wherein the first layer is a compact layer simulating epidermis; the second layer and the third layer are loose layers simulating dermis and subcutaneous tissues respectively, and are provided with mutually communicated micro-channels and different pore diameters; based on a 3D printing method, the three-layer bionic skin scaffold is prepared through specifically arranged bio-ink, the whole scaffold has the advantages of being high in swelling ratio, controllable in degradation, free of cytotoxicity, antibacterial, low in immunogenicity, capable of promoting high-quality repair of deep wounds and the like, and the skin scaffold and degradation products of the skin scaffold have good biocompatibility.