63 results about "Axial length" patented technology

The invention belongs to the technical field of medical auxiliary instruments, and discloses a head position supporting and fixing device for the anesthesiology department, which comprises a base plate, the base plate is connected with a head supporting and fixing assembly, the head supporting and fixing assembly comprises a base, a telescopic piece and a headrest plate, the base is connected with a bandage, a lock catch and a connecting seat, and the connecting seat is in sliding connection with the base. The telescopic piece is connected with the base plate. The connecting base is rotationally connected with the telescopic end of the telescopic piece. The headrest plate is connected with the base through a connecting shaft, an inner spline and a blank part are arranged on the inner side of the base, an outer spline is arranged on the outer side of the connecting shaft, and the axial length of the outer spline is smaller than that of the blank part. The head of a patient is fixed through the bandage, and the fixing stability of the head is good; the pitching angle of the head is adjusted by adjusting the height of the telescopic piece, the swinging angle of the head is adjusted by adjusting the meshing condition between the headrest plate and the spline of the base, and the clinical requirement for the head fixing angle can be fully met.

The application discloses a gas-liquid separator, which comprises a shell extending along an axial length, a first mounting opening is arranged at the top of the shell, a feed pipe is arranged in the shell through the first mounting opening, the feed pipe has opposite top and bottom ends, the top end is an open end for forming an inlet, the bottom end is a closed end, and a first cyclone mechanism is arranged at the bottom end, the first cyclone mechanism is used for providing centrifugal force to the entering fluid, and the first cyclone mechanism comprises a plurality of cyclone arms with a predetermined radian, the cyclone arm is a hollow cavity structure, one end of the cyclone arm is connected with the feed pipe, and the other end is a rotating arm outlet, a liquid discharge opening for guiding the separated liquid is further arranged on the shell, and a gas discharge opening for guiding the separated gas is further arranged on the shell. The application is a gas-liquid separator with simple structure, large processing capacity, high separation efficiency, small pressure drop loss and long-term stable operation, and can adapt to gas-liquid two-phase separation under different working conditions.

Provided is a ventilation member that is suitable for improving the ease of elastic deformation of an insertion part when the insertion part is inserted into an opening of a housing. This ventilation member (10) is provided with a support body (4a) and a ventilation membrane (2). The support body (4a) includes a base portion (11) and a leg portion (12) that support the ventilation membrane (2). The leg part (12) has a plurality of insertion parts (21) and claw parts (23). In a plane (A) orthogonal to the central axis (O) of the support body (4a) and passing through the root portion of the insertion part (21), when an imaginary circle passing through both end portions (21p) in the width direction of the inner surface (21c) of the insertion part (21) and centered on the central axis (O) is defined as a first imaginary circle (C1), the inner surface (21c) of the insertion part (21) has a protruding part (21d) that protrudes further toward the central axis (O) than the first imaginary circle (C1). The ratio of the length in the radial direction of the claw section (23) to the length in the axial direction of the insertion section (21) is from 0.3 to 0.5 (inclusive). In the plane (A), the maximum length of the protruding portion (21d) in the radial direction is 0.1 mm or more and 1.5 mm or less.

Disclosed are a stent delivery and release device and a stent delivery and release system. The stent delivery and release device (20) includes a stent proximal end release assembly provided at a proximal end of the stent delivery and release device, a guide head provided at a distal end of the stent delivery and release device, and a control member, wherein an external stent is configured to be loaded between the guide head and the stent proximal end release assembly; a proximal end of the control member is connected to the stent proximal end release assembly, and at least part of a distal end of the control member is wound around the stent and is detachably connected to the guide head; and the stent proximal end release assembly folds or releases the stent by controlling the axial length of the control member.

The invention provides a stent for coronary artery opening lesion treatment, which belongs to the technical field of medical instruments and comprises a tubular stent main body and an anchoring structure, the anchoring structure is arranged at one end of the tubular stent body and comprises a plurality of petal-shaped unfolding units evenly distributed in the circumferential direction. The petal-shaped unfolding units are attached to the outer wall face of the tubular stent body in the compressed conveying state and automatically turn and unfold outwards in the in-vivo releasing state, and an anchoring face is formed, and the included angle between the anchoring face and the axis of the tubular stent body ranges from 80 degrees to 100 degrees. The end, close to the anchoring structure, of the tubular stent body is further provided with an axial moldable transition section, and the axial length of the moldable transition section ranges from 1.5 mm to 3 mm. The invention provides a coronary artery opening stent with a petal-shaped anchoring structure and an axial moldable transition section. The coronary artery opening stent aims at fundamentally solving the problems of precise positioning and reliable fitting of opening lesion stent implantation.

Disclosed herein is a device for use in a spine surgery. The device includes: a first member having a distal end and a proximal end and includes a first lumen extending through the axial length of the first member and has a proximal opining for introducing a first fluid therethrough; a second member having a distal end and a proximal end and includes a second lumen sized to accommodate the first member therein except the distal and proximal ends thereof, a third lumen having a distal opening and is parallel to the second lumen, and a proximal inlet connected to the third lumen for introducing a second fluid therethrough; and an expandable structure coupled to the distal opening of the third lumen, wherein the first member is made of a rigid material, while the second member is made of a flexible material; and the second fluid is to expand the expandable structure. Also disclosed herein is a method for treating a spine disease by use of the device disclosed herein.

The invention discloses a tool positioning plate which is used for arranging an inserting piece, the inserting piece is provided with a penetrating column and a convex part, the convex part is connected with one side of the penetrating column, the tool positioning plate comprises a main body of a plate-shaped structure, the main body is provided with a top edge side and a bottom edge side, the length between the top edge side and the bottom edge side is defined as a first length, and the length between the top edge side and the bottom edge side is defined as a second length. The axial length of the penetrating column is defined as a second length, the first length is at least equal to the second length, the main body penetrates through a plurality of setting holes, a plurality of hole walls are formed on the main body, at least every three hole walls are sequentially adjacent to each other, a setting hole is formed among the hole walls, a plurality of stop surfaces are formed on the main body, and the stop surfaces respectively stop the convex parts entering the setting holes; therefore, the insertion piece is limited.

The invention discloses a mechanism improvement of a fluid rectifier for a pump pipeline, the mechanism improvement is applied to low-impurity fluid transportation, and the fluid rectifier is of a cylindrical structure, comprises a diverging pipe, a plurality of rectification modules, a plurality of flow mixing cylinders and the like, and is used for performing rectification functions such as cutting, limiting and guiding on pipeline fluid. The rectification module is provided with a plurality of rectification plates, and the number is N; the rectifying plate is in a streamline thin shape, the appearance of the rectifying plate is a trapezoidal plate, the rectifying plate comprises a bottom, a top, a front edge, a rear edge and the like, the inner wall of a cylinder of the rectifying module has an axial length, the bottom of the rectifying plate is axially mounted on the inner wall of the cylinder and extends inwards to form a longer edge at the bottom, the top has a shorter edge, and the height from the bottom to the top is larger than the height of the rectifying plate. The rectifier module is ensured to be an open flow field; the front edge and the rear edge respectively form oblique angles with the radial section; the bevel edge of the front edge of the rectifying plate can prevent long-strip-shaped sundries from being blocked on the rectifying plate.

The utility model provides a wearable device hinge which comprises a fixing frame and a rotating structure, and the rotating structure comprises a connecting frame, a first connecting rod, a connecting shaft and a torsion rebounding mechanism. The torsion springback mechanism comprises a fixing shaft and a torsion connecting rod, the first end of the torsion connecting rod is connected with the fixing shaft, the second end is connected with the connecting shaft, the first end of the first connecting rod is fixedly connected with the connecting frame, and the second end is connected with the connecting shaft; the fixing frame is further provided with a supporting part for the first connecting rod, so that after the first connecting rod rotates around the connecting shaft from the first angle to the second angle, the first connecting rod is matched with the supporting part to form a rod piece rotating around a new circle center in the rotating interval from the second angle to the third angle. According to the utility model, a better clamping force value is realized, the wearing experience feeling is improved, and the pair of glasses can be successfully applied to occasions such as AR (Augmented Reality) glasses which need to be continuously opened after a basic angle and can be rebounded, and the requirement on the axial length is higher.

The invention belongs to the technical field of medical instruments, and discloses an axial shrinkage prevention device for a balloon catheter. The device comprises a first assembly. The first assembly is arranged on the balloon and extends in the axial direction of the balloon, the two ends of the first assembly are connected with the opposite inner walls of the balloon in the axial direction respectively, the first assembly comprises an energy storage part capable of storing and releasing energy, and when the balloon is in a full state, the inner walls of the two sides of the balloon move oppositely to drive the first assembly to be compressed in the axial direction, and the energy storage part stores energy; when the balloon is switched from the full state to the pressure relief state, the energy storage part releases energy, the first assembly is driven to axially extend, and the balloon is subjected to axial tension, so that the axial length of the balloon in the pressure relief state is larger than that of the balloon in the full state. By means of the pressure relief balloon, the problems that due to the fact that the outer diameter of the balloon is too large after pressure relief, damage to tissue is aggravated in the withdrawing process, the difficulty of withdrawing a sheathing canal is increased, or a sheathing canal of a larger specification needs to be adopted are solved, and therefore the possibility of damage to the tissue in an operation and postoperative complications is reduced.

The invention discloses a linear actuator for driving a tendon rope and a dexterous manipulator. The linear actuator comprises a guide support, a lead screw, a rotating source, a nut and the tendon rope, and the lead screw is rotationally connected to the guide support; one end of the screw rod is fixedly connected to the output end of the rotating source; the rotating source is used for driving the screw rod to rotate; the nut is slidably connected to the guide support in the axial direction of the lead screw and is in threaded fit with the lead screw. One end of the tendon rope is fixed to the nut. According to the linear actuator, an extension rod is omitted, the tendon rope is directly fixed to the nut, the maximum axial length of the linear actuator is effectively reduced, and integrated design is better facilitated.

An ophthalmic device, its control method, and storage medium are disclosed. Highly reliable axial length measurement can be performed independently of the movement of the examined eye. An exemplary embodiment of the ophthalmic device performs a first optical coherence tomography (OCT) scan of a first region containing a first part of the examined eye and a second OCT scan of a second region containing a second part. The ophthalmic device aligns itself by acquiring first offset information of the examined eye before the first OCT scan and by acquiring second offset information before the second OCT scan. The ophthalmic device calculates the distance between the first and second parts of the examined eye based on the first data acquired through the first OCT scan and the second data acquired through the second OCT scan.

The present application relates to a kind of extrusion forming method of the discontinuous inner rib of cylindrical structure, belong to forming processing technical field, solve the problem that continuous hot extrusion process in prior art cannot prepare longitudinal equal cross section hot extrusion product, especially the continuous extrusion pipe or cylindrical inner cavity structure product with protruding inner rib structure perpendicular to extrusion direction of inner wall.The present application includes the following steps: determining product parameters;Select forming part and core;Assemble forming device;Charge;Start forming device;Extrude the material to be formed.The present application can extrude forming to generate the cylindrical structure product with integrated inner rib along axial forming, can generate helical inner rib, the generation position and axial length of generated helical inner rib are controllable, the shape of generated helical inner rib is various, and cylindrical structure product can also be continuously produced.

This invention relates to the field of axial length data processing technology, specifically to an intelligent intervention system for myopia prevention and control in adolescents based on dynamic axial length monitoring. The invention uses normally labeled samples of the same sex as reference samples for the samples to be analyzed, obtaining multiple axial length time periods. Based on the axial length distribution of the samples to be analyzed and the reference samples within each axial length time period, the degree of visual impairment for each sample within each axial length time period, and the critical value for the degree of impairment of non-impaired samples, are obtained. Based on the distribution of visual impairment degree and axial length of the samples to be analyzed and impaired samples within each axial length time period, overall similar samples are obtained. Based on the distribution of visual impairment degree of overall similar samples within different axial length time periods, and the critical value for the degree of impairment, dynamic axial length monitoring is performed on the samples to be analyzed. This invention improves the accuracy of dynamic axial length monitoring by accurately analyzing the degree of visual impairment and the critical value for the degree of impairment of the samples.

The present disclosure describes a microfabricated intravascular device configured for high axial strength, while the microfabricated intravascular device also maintains effective flexural flexibility. A pipe member includes a series of circumferentially extending rings that are interconnected by a series of axially extending beams. The transverse cutouts separate and define the rings. A series of axial cutouts are aligned with the beam and extend partially from the beam into the adjoining ring such that the beam length is nested partially within the axial length of the adjoining ring. This increases the functional length of the beam to provide flexural flexibility while still having sufficient ring structure to provide effective axial stiffness.

The utility model discloses a light guide arm and medical equipment, and relates to the technical field of medical instruments, and the light guide arm comprises a base, a light guide arm main body and a limiting assembly; one end of the light guide arm main body is a connecting end and is in swinging connection with the base by taking the connecting end as a fulcrum; the limiting assembly is provided with a station position and a storage position. The limiting assembly is arranged to be provided with the working position and the containing position, when the light guide arm needs to be contained, the limiting assembly is adjusted to the containing position, limitation on the swing angle range of the light guide arm body is relieved, the light guide arm body can swing to be parallel to the base, the overall axial length of the light guide arm is reduced, and therefore the packaging size of the light guide arm is reduced; the storage is convenient, and the convenience of packaging and transportation is improved.

The application discloses a delivery system, which comprises a handle, a sheath tube, a sheath core and a tip head; the handle comprises a front handle and a rear handle which are arranged in an axial forward and backward direction, and the rear handle can move forward and backward relative to the front handle; the distal end of the sheath core is connected with the tip head, and the proximal end of the sheath core extends into the handle; the sheath tube is coaxially sleeved outside the sheath core, the proximal end of the sheath tube extends into the handle and is connected with the rear handle; in a first state in which the distal end face of the sheath tube is attached to the tip head, there is a reserved gap with an axial length of h1 between the front handle and the rear handle; when the rear handle moves towards the front handle to reduce the reserved gap, the rear handle drives the sheath tube so that the distal end face of the sheath tube is tightly attached to the tip head to form a second state, and in the second state, the sheath tube is axially fixed relative to the tip head and the rear handle. The application aims to solve the problem that the front end of the sheath tube is lifted and scratched relative to the step of the tip head.

The invention discloses a capsule cutting and separating device which is characterized in that an arc baffle wraps the peripheral surface of the middle of a roller provided with capsule containing grooves, and mold column mounting holes corresponding to the capsule containing grooves are formed in the portions, on the outer sides of the two ends of the capsule containing grooves, of a roller body respectively; the inner surface of the arc baffle and the peripheral surface of the roller provided with the capsule accommodating groove form a capsule channel; the distance between the inner surface of the arc baffle and the bottom of the capsule containing groove is larger than the diameter of the capsule, and the distance between the inner surface of the arc baffle and the peripheral face of the roller provided with the capsule containing groove is smaller than the diameter of the capsule. A gap with the distance larger than the axial length and the diameter of the slitter edge is formed between the side end face of the arc baffle and the orifice end face of the die column mounting hole to form a slitter edge separation channel, and an outlet of the capsule channel at the front end of the arc baffle is provided with a certified capsule collecting channel. The authentic capsules firstly separated from the cutting die column are collected after being conveyed for a certain distance in the capsule channel, and the waste edges which are separated later are separated and collected firstly, so that the problem that the waste edges and the authentic capsules cannot be completely separated is solved.

A stator core is provided and includes laminations disposed in a laminated arrangement to form a stator core body having an axial length extending in a lamination dimension. The stator core body includes an annular portion extending along the axial length, teeth extending radially from the annular portion and along the axial length and fins. Each tooth is formed to define one or more holes running along the axial length. The fins extend circumferentially across each of the one or more holes.

The present disclosure describes a microfabricated intravascular device configured for high axial strength while also maintaining effective bending flexibility. A tubular member includes a series of circumferentially extending rings interconnected by a series of axially extending beams. Transverse cuts separate and define the rings. A series of axial cuts are aligned with the beams and extend partially from the beams into the adjoining rings such that the beam length is partially nested within the axial length of the adjoining rings. This increases the functional length of the beams to provide bending flexibility while still having sufficient ring structure to provide effective axial stiffness.

This invention relates to a ceramic dental implant (100) for implantation into the jawbone, the implant (100) extending from a apex (103) to a coronal end (102). The implant (100) has a blind hole (104) opening toward the coronal end (102) of the implant and extending toward the apex (103) along a central longitudinal axis LA. The blind hole (104) includes a threaded section (107) having a base surface (108) from which a thread (109) projects radially inward, the base surface (108) defining a maximum radius R of the thread (109) measured from the central longitudinal axis LA. max The thread (109) has a crown facet (112) and a top facet (114), which are connected at their radially inner ends by a crest (116), which defines the minimum radius R of the thread (109) as measured from the central longitudinal axis LA. min The thread (109) extends helically along the axial length of the thread section (107) and has a depth defined by the radius difference between the base surface (108) and the crest (116). The thread section (107) includes a main portion (115) in which the maximum radius R of the thread (109) is... max The length of the portion (115) remains constant; and there is a tapering portion (117) adjacent to the main portion (115) at the top, in which the base surface (108) extends in the upward direction from the maximum radius R of the thread (109) in the main portion (115). max The minimum radius R of the thread 109, which tapers radially inward to the tip of the tapered portion (117), is... min The tapered portion (117) extends in an axial length greater than the thread pitch to form a tapered thread (119) with a gradually decreasing thread depth, the tapered thread (119) extending more than one turn of the thread.

The present disclosure is directed generally to mechanical cardiovascular support systems used in the medical field to assist the movement of blood. In particular the present disclosure is directed to an impeller having features that allow improved performance. An annular flow area around a rotating impeller may be variable along the axial length of the impeller. A first radial gap, between a distal region of the impeller and a surrounding tubular housing, may be greater or smaller than a second radial gap, between a proximal region of the impeller and the surrounding tubular housing.

The utility model relates to a sealing assembly and a bearing assembly. The sealing assembly comprises a sealing body, a main sealing lip is arranged at the radial inner end of the sealing body, the main sealing lip inclines towards the axial side and the radial inner side of the sealing body, the main sealing lip is provided with a contact sealing section with the preset axial length, and a contact sealing face is formed on the radial inner surface of the contact sealing section. The axial long contact sealing section increases the contact area of the main sealing lip and the bearing inner ring to form a longer sealing interface, so that external liquid coolants (such as cutting fluid, water and the like) can be more effectively prevented from invading, and the leakage risk is reduced. Meanwhile, the contact pressure can be effectively dispersed, the friction coefficient is reduced, the friction torque is reduced, the abrasion resistance of the contact sealing surface of the contact sealing section of the sealing body is improved, and the service life is prolonged.

The invention relates to the technical field of shield segment connection, in particular to a compression-expansion self-locking type shield segment connecting device. A cylindrical receiving groove is formed in the end face of one end of a female head of the compression-expansion self-locking type shield segment connecting device, and a limiting groove is formed in the inner circumferential face of the receiving groove; the end part of the male head is provided with a cylindrical insertion end, the insertion end is matched with the receiving groove, and the end surface of the insertion end is provided with a cylindrical hollow groove; a cushion block and an elastic expansion body are arranged in the hollow groove, and the sum of the axial lengths of the cushion block and the elastic expansion body is larger than that of the hollow groove; a plurality of mounting grooves are formed in the peripheral surface of the insertion end, each mounting groove is communicated with the hollow groove, a limiting block is arranged in each mounting groove, the limiting blocks are opposite to the elastic expansion bodies in position, and the axial length of the mounting grooves is smaller than or equal to that of the limiting grooves; after the insertion end is inserted into the receiving groove, the female head and the male head are coaxially arranged, and the limiting block is opposite to the limiting groove. The connecting structure has the beneficial effects that the connecting process is simple, the construction efficiency is high, compression expansion self-locking can be achieved, connection is firm, the connecting structure is suitable for annular and longitudinal connection, and the adaptation degree is high.

The invention relates to a spectacle lens which comprises a lens body, the lens body is concentrically provided with three functional areas along the radial direction, and the three functional areas are a central refractive area, a second refractive area and a third refractive area from inside to outside in sequence; the central refraction area is arranged at the optical center of the lens body, the central refraction area is arranged to be an area with convex positive lens diopter, and the convex positive lens diopter range is + 1.00 D to + 3.00 D; the second refraction area surrounds the periphery of the central refraction area, and the second refraction area is arranged to be an area with a micro-frosted structure on the surface; the third refraction area surrounds the periphery of the second refraction area, and the third refraction area is arranged to be an area with a micro-frosted structure on the surface. According to the spectacle lens, active relaxation and passive inhibition are combined; the convex positive lens structure of the central refraction area realizes relaxation of ciliary muscles when people look near, so that asthenopia is reduced from the source; and the second and third refractive areas inhibit the growth of the eye axis through a defocusing effect to form double prevention and control of'relaxation + inhibition '.

The utility model relates to an artery blood vessel wall mechanical property experiment device capable of simulating physiological environment conditions. Comprising a heat preservation table, a liquid inlet pipe, a liquid outlet pipe, a driving assembly, a pressure pump, a constant-pressure tank, an inflation bag and a controller. A base is arranged on one side of the heat preservation table, a pull rod is fixedly installed on the base, a tension sensor is arranged on the pull rod, and a liquid outlet pipe is arranged at the free end of the pull rod; a liquid inlet pipe is mounted in the testing groove and is connected with the driving assembly; the upper end of the liquid inlet pipe is connected with a pressure pump, an electromagnetic valve and a pressure sensor are arranged on the liquid guide pipe, and the pressure pump is connected with a pss solution box through a pipeline; the liquid outlet pipe is connected with the constant-pressure tank; the constant-pressure tank is also connected with the inflatable bag; according to the device, the change of the diameter and the axial length of the blood vessel test piece can be recorded in real time through the CCD camera when the internal pressure of the blood vessel test piece is changed or the blood vessel test piece is pulled, and the change is converted to the display screen to be displayed, so that a worker can conveniently monitor the deformation of the blood vessel test piece.

This application relates to a thermal stress relief device for a casing, comprising a casing, a first tube, a second tube, a cover plate, and a partition plate. One end of the first tube is connected to the casing, and the other end is movably disposed along the axial direction of the first tube. At least a portion of the first tube is capable of deforming and expanding along the axial direction of the first tube. The axial direction of the second tube is the same as that of the first tube. The second tube has a second cavity communicating with the outside. One end of the second tube is connected to the casing, and the other end is movably disposed along the axial direction of the second tube. The end of the second tube facing away from the casing moves synchronously with the end of the first tube facing away from the casing. At least a portion of the second tube is capable of deforming and expanding along the axial direction of the second tube. This device can compensate for the axial length changes of adjacent expansion elements of the GIS casing caused by thermal expansion and contraction, releasing the thermal stress on the casing caused by the thermal expansion and contraction of longer GIS elements.

This invention provides a covered stent, comprising a main body segment having a tubular body and a branch segment. The branch segment includes a first branch and a second branch. The axial length of the first branch is greater than or equal to the axial length of the second branch. The first branch includes a first parallel portion that can be arranged alongside the second branch. The first parallel portion includes a proximal portion on the proximal side and a distal portion on the distal side along the axial direction. The axial deformation resistance of at least the distal portion of the first branch is greater than or equal to the axial deformation resistance of the proximal portion. By enabling at least the distal portion of the first branch implanted in the external iliac vessel to have good axial deformation resistance, occlusion of the lumen due to covered extension can be avoided at least at this location. Furthermore, the entire axial segment of the covered stent can be provided with good axial deformation resistance, thereby preventing stent lumen narrowing from affecting blood flow.

This invention relates to an artificial valve delivery device and system. The device includes a balloon catheter, a bend-controlled outer tube, and a proximal handle. The balloon catheter includes a balloon body, a first stop, and at least two alignment imaging elements. The first stop is located at the distal end of the balloon body and is used to limit the compression of the artificial valve. The alignment imaging elements are located on the first stop, and multiple alignment imaging elements are distributed circumferentially. At least some of the alignment imaging elements differ in at least one of axial length, shape, or circumferential position, for forming orientation identification features under fluoroscopic imaging. The proximal end of the balloon catheter is provided with an external marker including multiple circumferentially distributed alignment marks, which correspond to the alignment imaging elements. The bend-controlled outer tube is sleeved outside the balloon catheter and includes a bendable adjustment section. The proximal handle is connected to the proximal ends of the balloon catheter and the bend-controlled outer tube and includes a bending control mechanism and a position adjustment mechanism.

This invention belongs to the field of ophthalmic medical technology and discloses a method, device, equipment, and storage medium for predicting the development of refractive status. The method for predicting refractive status development includes: acquiring basic biological parameters and multi-dimensional optical parameters of a target individual, wherein the multi-dimensional optical parameters include at least one of refractive parameters, higher-order aberrations, and visual quality parameters; inputting the basic biological parameters and multi-dimensional optical parameters as input data to a prediction model to obtain a predicted value of the target individual's refractive status change, wherein the predicted value of the refractive status change includes at least one of the axial length change and periodic refractive error change within a preset time period. This can help improve the early identification ability of the risk of refractive errors in a target individual and recommend the best prevention and control measures for refractive errors in that individual.