24 results about "Axial length" patented technology

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.

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.

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.

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 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.

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.

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.

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 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.

This invention provides a covered stent, comprising a main body segment and branch segments. The branch segments include 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 has multiple first wave coils along its axial direction, and the second branch has multiple second wave coils along its axial direction. By arranging the first branch and the second branch side by side, at least the first and second wave coils in the side-by-side portion are staggered in the axial direction. This results in a reduction in the radial volume of the bi-branch stent during side-by-side folding and compression delivery due to the staggered wave coils. This allows for the insertion of a smaller sheath, making it suitable for more patients, while also improving the patency of the delivery device into the blood vessel.

A stent structure and an expandable catheter sheath, the stent structure comprising a plurality of support skeletons and support beams, the support skeletons being annular or arc-shaped, and the plurality of support skeletons being arranged in sequence along an axis; the support beams being used for connecting the plurality of support skeletons. The support skeleton comprises an expansion part, which expands radially under the action of an external force, and drives the support skeleton to expand along the radial direction; after the external force is removed, the expansion part retracts, and drives the support skeleton to contract along the radial direction. By setting the expansion part, and by utilizing the characteristics that the expansion part expands under stress and retracts after the external force disappears, the expansion and retraction of the stent structure are realized, so that the expandable catheter sheath can be expanded by a smaller external force, and the surgical process is more convenient. In addition, the support beams are also provided, so that the axial length of the stent structure is not easy to change during the expansion and retraction process, and the structure is more stable and reliable; and the support beams can also provide certain radial support for the expandable catheter sheath, so that the expandable catheter sheath is not easy to bend during the surgical process.

This application discloses a drive structure and a blood pump having the same. The drive structure drives an impeller in the blood pump to rotate. The drive structure includes a motor stator and a motor rotor drive structure for connection to the impeller. The motor stator includes multiple iron cores wound with coils, and the motor rotor includes multiple magnets distributed circumferentially. The axial length of the iron cores is selected between 6 mm and 9 mm, the yoke height is selected between 1.5 mm and 2.5 mm, the number of turns of the coil wound on each iron core is selected between 145 and 155, and the axial length of the magnets is selected between 2 mm and 3.5 mm. Applying this application can reduce the warming effect on the blood, which is more conducive to preventing thrombus formation.

The present invention aims to provide a casing prefabricated body, a housing casing, and a method for manufacturing the same. The casing prefabricated body includes: a mother prefabricated body, the length of which is the total circumference of an annular component formed by multiple turns of prefabricated body winding, the width of which is the axial length of the annular component or the sum of the axial length of the annular component and the height of the flange edge, and the thickness of which is the thickness of the non-enclosing area of ​​the annular component; and a child prefabricated body, woven above the mother prefabricated body. The outermost ring of the mother prefabricated body is not woven with the child prefabricated body, so the length of the child prefabricated body is less than or equal to the total length of the mother prefabricated body minus the length of the outermost ring of the mother prefabricated body, the width of the child prefabricated body is the width of the enclosing area of ​​the annular component, and the thickness of the child prefabricated body is equal to the thickness of the enclosing area minus the thickness of the mother prefabricated body.

The present invention discloses an eye health monitoring and mediation method and system, which includes acquiring a patient's axial length data using a pre-configured axial length detection module, generating an estimated prescription for the patient based on the axial length data, and storing the axial length data and estimated prescription in a server; in response to the initial storage of axial length data, the server constructs a personal health database for the patient based on the axial length data and estimated prescription, and transmits the estimated prescription to the user terminal; in response to subsequent acquisitions of axial length data, the server generates an axial length change record based on the multiple stored axial length data, stores the axial length change record in the personal health database, and if the axial length change record is greater than a pre-configured threshold, the server sends an alarm message to the user terminal. The present invention establishes a mechanism for tracking a patient's eye health data over the long term by matching medical institutions with health activity locations, effectively improving the benefits of long-term tracking of eye health, and enabling the utilization of available resources such as optometrists and opticians.

A filter assembly has a housing. The housing has an inner body and an outer body surrounding at least a portion of the inner body. The inner body has a base extending in a lateral direction and a first sidewall extending axially outward from the base. The inner body defines a cavity. The first sidewall defines a perimetric surface around the cavity. A first filter media extends across the perimetric surface and across the cavity. An adsorbent is disposed in the cavity. The outer body has a second sidewall laterally outward from and surrounding the first sidewall. The second sidewall spans at least 50% of the axial length of the first sidewall. The outer body has a first axial end and a second axial end and a retainer portion extending laterally inward from the first axial end. The retainer portion is positioned axially outward from the first filter media.

This invention relates to a thrombectomy device and a thrombectomy system. The thrombectomy device includes a thrombectomy support and a filter membrane. The thrombectomy support has a mesh structure with an inner cavity. The thrombectomy support includes a proximal end and a distal end, the proximal end being an open end, and the distal end being axially opposite to the proximal end. The filter membrane forms a collection cavity and has multiple through holes. The circumferential width of each through hole ranges from [1 mm to 12 mm], the axial length of each through hole ranges from [1.5 mm to 12 mm], and the area of ​​the hollow region of each through hole ranges from [1.5 mm² to 150 mm²]. The filter membrane includes an open end and a closed end. The open end is connected to the thrombectomy support. The closed end is axially opposite to the open end and can be accommodated in the inner cavity of the thrombectomy support, so that the collection cavity formed by the filter membrane is located in the inner cavity. The thrombectomy device of this invention provides less resistance when carrying thrombi into the delivery sheath.

The purpose of this invention is to provide a ventricular assist catheter pump with good bending performance and light weight. The motor is connected to the catheter at its proximal end and to the impeller at its distal end. The two ends of the rotor assembly's shaft are connected to the housing via proximal and distal bearings, respectively, forming a rotational support. A proximal PCB stator assembly and a distal PCB stator assembly with printed coils are respectively located on the proximal and distal sides of the magnet in the rotor assembly. These three components are arranged in parallel to form a double-air-gap axial magnetic circuit structure. This single-rotor-double-stator structure provides high output torque. This invention employs a flattened structure of the axial magnetic flux-coupled PCB stator, effectively shortening the axial length of the motor. The magnet diameter can be set larger, and the axial length is significantly reduced, allowing the blood pump to achieve an axial length of 15-20mm without changing the diameter, thus solving the problem of bending performance of blood pumps in clinical practice. The PCB stator assembly has a very thin structure, with the coils printed on it, which not only shortens the axial length of the motor but also reduces the overall weight of the motor.

This application relates to the field of intelligent intraocular lens (IOL) selection, specifically disclosing an intelligent IOL selection system for cataract surgery based on ocular bioparameters. The system is not limited to the acquisition of traditional static geometric data such as axial length and corneal curvature, but further utilizes a deep convolutional neural network to extract texture features and perform dimensionality reduction mapping on anterior segment tomographic images, thereby resolving the capsular bag compliance feature vector characterizing the biomechanical properties of the ocular soft tissue. Based on this, the geometric parameters of the patient's eye, capsular bag compliance features, and the mechanical and physical properties of the IOL are combined. By introducing a physical constraint mechanism, the mechanical equilibrium state after lens implantation is simulated, thus accurately predicting the effective lens position. This effectively addresses the fitting challenges of non-standard eyeballs or special lens models, significantly improving the accuracy and stability of postoperative refractive prediction.

The application provides a medical catheter, comprising: an inner layer, an outer layer, and a developing ring, the outer layer is sleeved outside the inner layer, the developing ring is arranged between the inner layer and the outer layer, the medical catheter comprises a head section, a developing section and a main body section from the distal end to the proximal end in sequence, the head section corresponds to the most distal end of the medical catheter to the most distal end of the developing ring, the developing section corresponds to the axial range of the developing ring, and the main body section corresponds to the proximal end of the developing section to the proximal end of the medical catheter, wherein the axial length of the head section is L1, the single-side wall thickness of the head section in the radial direction is h1, and 0.3≤L1≤33.32h1 2 -2.66h1+0.74. In this way, by controlling the axial length of the head section, the possibility of collapse, distortion or delamination of the head section in clinical operation is reduced, thereby improving the stability and safety performance of the catheter in the process of sucking thrombus.

This invention discloses a stent delivery assembly, relating to the field of neurointerventional medical devices. It includes a ground core wire with a variable diameter section, a support spring sleeved on its outer side, and an inner liner spring coaxially nested between the two. The inner liner spring has multiple alternating large-diameter sections and multiple small-diameter sections, with an axial length less than the support spring. The large-diameter sections are close to the support spring, and the small-diameter sections are close to the ground core wire. A first micro-gap is formed between the inner diameter of the small-diameter section and the outer diameter of the core wire, and a second micro-gap is formed between the outer diameter of the large-diameter section and the inner diameter of the support spring. This invention utilizes the micro-gap between the small-diameter section and the variable-diameter core wire to form multiple radial restraint points, effectively suppressing wave-like twisting of the core wire when encountering resistance in tortuous blood vessels, significantly improving the efficiency of proximal pushing force transmission to the distal end. Simultaneously, the second micro-gap ensures the coaxiality of all components, reducing assembly difficulty and improving product yield.

This application discloses a zirconium alloy mouth ring device and assembly method for centrifugal pumps, relating to the field of centrifugal pumps. The zirconium alloy mouth ring device for centrifugal pumps includes a first mouth ring and a second mouth ring. The outer wall of the first mouth ring mates with a mounting hole in the pump body or pump cover, and its outer wall is provided with a first interference fit portion and a first transition fit portion sequentially along the axial direction. The inner surface of the second mouth ring mates with the mounting journal of the impeller, and its inner surface is provided with a second interference fit portion and a second transition fit portion sequentially along the axial direction. The ratio of the axial length of the first interference fit portion to the first transition fit portion, and the ratio of the axial length of the second interference fit portion to the second transition fit portion, are both 1:1.5 to 1:2.5. This application corrects mouth ring deformation through interference fit and absorbs assembly errors through transition fit, solving the problem of assembly accuracy control caused by the inability to precision machine zirconium alloy mouth rings after heat treatment, and ensuring the uniformity and stability of the mouth ring operating clearance.

The application discloses an intraoperative stent, which comprises a main stent, a recess being arranged on the outer circumferential surface of the main stent, and an inlay body, the inlay body having a preset axial length, an inlay channel being arranged in the inlay body and penetrating the proximal end and the distal end of the inlay body, the inlay body being at least partially accommodated in the main stent and the inlay channel being communicated with the recess, the inlay channel being used for cooperating with an implanted external branch stent, and the distal end of the inlay body can swing relative to the proximal end of the inlay body. The application aims to reduce the difficulty of establishing a guide wire channel in a replacement process.

An adjusting device (100) for a mounting arrangement (200), situated between a first part (300) and a second part (400), and a related method are disclosed. The adjusting device (100) comprises at least one element (110) with at least one feedthrough opening (112) for a fastening device (120). The at least one element (110) has at least one protruding portion (111) eccentrically located from a length axis of the fastening device (120). The at least one protruding portion (111) is protruding out of a first element surface (118), and the at least one element (110) has a first adjustment means (113), along at least a portion of its axial length (E), at its radially located surface, for rotational adjustment of the element (110) around the length axis (L) of the fastening device (120) in order to locate the protruding portion (111) in a desired position.