150 results about "Bone length" patented technology

The present invention provides a bone in-growth and on-growth material and method for making a material by bonding porous sheets together. The porosity is controllable from zero porosity to essentially a fully porous material.

A surgical instrument is provided, as is a method for stabilizing and facilitating recovery of injured bone within a living body. The surgical instrument includes a flexible cable and a plurality of permanent bone-contacting enlargements fixedly attached to the flexible cable. The bone-contacting enlargements are spaced apart from one another to provide linking cable portions alternating with the spaced bone-contacting enlargements. The spaced relationship between the bone and the linking cable portions provide channels along the bone length for permitting vascular circulation across a region of the injured bone to which the surgical instrument is applied.

Bone length adjustment method and system includes a two-part telescopic device connected to bone parts whose length between the connection points is to be adjusted, with each part of the telescopic device being secured to the bone part, and a rod with an embedded permanent magnet which is in threaded engagement at one or both of its ends with one or both of the parts of the telescopic device. The permanent magnet in the rod is excited by an external solenoid arrangement to cause a radial force to develop at the rod thereby causing it to rotate. Rotation of the rod is converted via the threads at one or both of its ends to axial motion or movement of the telescopic parts relative to each other and thereby causes an increase or decrease in the bone length depending on the direction of axial movement between the telescopic parts.

The present invention provides a two-part telescopic intramedullary orthopedic device comprising a first section inserted into the medullary cavity of one of the fractured or severed bone ends, and secured thereto, and a second section inserted into the medullary cavity of the other fractured or severed bone end and secured thereto, wherein the first section is telescoped within the internal space of the second section, and wherein one of the sections comprises a ferromagnetic material and the other section is either constructed entirely of a non-magnetic material or comprises a ferromagnetic material, wherein the ferromagnetic section(s) are actuable by an external axially directed magnetic field, such that one section may be caused to move axially (either bidirectional or essentially unidirectional) in relation to the other section. In addition, the invention encompasses a method for changing bone length as well as a method for enhancing bone fracture healing.

Bioresorbable scaffolds for bone engineering, such as repair of bone defects, particularly long bone defects, or augmentation of bone length are described. Scaffolds are porous and comprise multiple side channels. In one embodiment, scaffolds are made from layers of micro-filament meshes comprising polycaprolactone (PCL) or a PCL-composite sequentially laid in incremental 60 degrees of rotation to produce a 0 / 60 / 120 degree layering pattern, providing for the formation of interconnected pores. The scaffold can comprise a central channel filled, packed or infused with suitable agents such as bioactive agents. Furthermore, the scaffolds are stiff but yet fracture resistant and with sufficient bending, compressive and torsional strength suitable for bone engineering. The slow degradation of the scaffold is sufficient for the 3D matrix to maintain structure integrity and mechanical properties during the remodelling process.

The invention discloses a facial acupoint positioning method and positioning device based on a feature point positioning algorithm. The method is characterized by dividing facial acupoints into three types; inputting a facial image, carrying out search on the input facial image according to training results of a facial active shape model to obtain facial feature reference points of the facial image, and determining the first type of acupoints; calculating individualeum length through a bone-length measurement method, and obtaining the second type of acupoints according to the facial feature reference points of the facial image and the individualeum length; and inputting the facial feature reference points of the facial image to a neural network model training result to obtain the third type of acupoints of the input facial image. The positioning method can calculates the position of a specified acupoint in the face through face identification and analysis, and has the advantages of low cost and simple use, individual acupoint positioning and non-contact and the like.

A fixture of a two-piece dental implant and a method of use are provided. The implant can comprise a apical portion, a top portion arranged opposite the apical portion, an internal threaded cavity, and a coronal portion. The apical portion can define a bone length and a helical thread having a maximum outer diameter. The internal threaded cavity can be configured to releasably receive at least one of a surgeon tool and a prosthetic component. The coronal portion can be devised for apposition to soft tissue and for connective tissue attachment. Further, the coronal portion can have an extension in the longitudinal direction of the implant that is devised to be less than a layer thickness of the soft tissue. Furthermore, a ratio of the bone length to the maximum outer diameter can be in the range from approximately 0.8 to 1.2.

The invention provides a multi-person motion capture method based on three-dimensional hypothesis spatial clustering. The method can be used for unmarked human motion capture. The method comprises thesteps of associating two-dimensional joint point candidate points between different views, reconstructing three-dimensional joint point candidate points, and carrying out three-dimensional attitude analysis and attitude tracking. Under the condition that a human body model is not utilized or any human body prior knowledge is assumed, stable and credible two-dimensional and global three-dimensional human body posture estimation can be carried out on a plurality of persons with different figures and unfixed number of people. The generated posture meets the multi-view geometric constraint and the human body bone length constraint, and robust and credible human body posture estimation under challenging scenes such as multi-person mutual shielding and close interaction is achieved.

The invention discloses a biological-type knee joint partition bone trabecula tibial plateau. The biological-type knee joint partition bone trabecula tibial plateau comprises a reniform plateau bearing part, a handle is arranged in the middle of the lower surface of the reniform plateau bearing part, parts, except the connecting handle, of the lower surface of the reniform plateau bearing part areprovided with bone trabeculae, and the reniform plateau bearing part is divided into an inner side area, a middle area and an outer side area; the hole diameter and porosity of the bone trabeculae inthe inner side area are larger than those of the bone trabeculae in the outer side area and the middle area in sequence. The partition bone trabecula tibial plateau is integrally formed through 3D printing of titanium alloy, and the hole diameters and porosities of the bone trabeculae arranged in different areas of the lower surface of the tibial plateau are different. An experiment proves that through partition arrangement of the bone trabecula of the biological-type knee joint tibial plateau, under the actual circumstance of uneven stress of the tibia, uniform bone ingrowth is achieved, andthe long-time stability of the biological-type tibial plateau is improved. through 3D printing, the surface of the whole component is rough, friction between the plateau and the tibia is increased, and the initial stability of the plateau is improved.

The invention discloses a human body motion tracking method based on combination of production and discriminant. The human body motion tracking method is mainly used for solving the problem of inaccurate tracking result of human body motion in the prior art. The implementation steps of the human body motion tracking method are as follows: building a human body skeleton model; pre-processing a video image to obtain a detection joint; extracting bandlet 2 characteristics of the video image; inputting the extracted bandlet 2 characteristics and predicting a human body gesture by using double-Gauss; initializing the human body skeleton model according to the detected joint; structuring 2D and 3D similarity functions between the joint predicted by the double-Gauss and the detected joint; minimizing the similarity functions under the restriction of bone length to obtain a group of human body gestures; and selecting a state with the minimum Euclidean distance to a former frame skeleton from the obtained human body gestures as the best motion gesture of a current frame. Compared with the existing human body tracking method, the human body motion tracking method based on combination of production and discriminant has the advantages of high accuracy of tracking result and high stability, and can be applied to the medical treatment, physical training, animation production and intelligent monitoring systems.

A method and a device are provided, for measuring an actual length of a fractured bone based on 2D fluoroscopic images of proximal and distal sections of the bone, each of the images including a reference body. Based on the images, a spatial position of a first end point and a spatial position of a second end point are determined, taking into account dimensions taken from a bone model of a bone corresponding to the imaged bone and the spatial positions of the reference bodies. The actual length of the fractured bone is defined as the distance between the two end points.

The invention provides a global three-dimensional human posture credible estimation method based on two views, which can be used for unmarked human motion capture. The core innovation points of the invention are as follows: Firstly, the invention proposes to detect unreliable joint points based on the polar geometry constraint and the human bone length constraint in two views. Secondly, the invention proposes to correct unreliable joints by polar constraint and bone length constraint based on the confidence diagram of the joint estimated by the network. Finally, the invention provides a simpleand efficient camera external parameter automatic calibration technology and a bone length calculation method. The invention can realize stable and reliable two-dimensional and global three-dimensional human posture estimation for anyone with different body shapes without using human body model or assuming any prior knowledge of human body. The posture generated by the invention satisfies the epipolar geometry constraint of two views and the human bone length constraint, and realizes robust and reliable human posture estimation under challenging scenarios such as severe occlusion, symmetric ambiguity, motion blur and the like.

The invention discloses a silicon nitride ceramic artificial hip joint, which consists of an acetabular cup, an acetabular lining, an artificial femoral head and a femoral stem, and relates to the technical field of artificial joints. The acetabular cup, the acetabular lining, the artificial femoral head and the femoral stem are all made of silicon nitride ceramic materials, so that the acetabularcup, the acetabular lining, the artificial femoral head and the femoral stem not only possess various excellent performances of bioceramic implant but also have the advantages of high hardness, highbending strength, high fatigue strength and high fracture toughness, excellent friction performance, good bone length and bone growth capability, good anti-infection capability and good developability, and can improve the abrasion and stress shielding problems of the artificial hip joint. Wherein the outer peripheral surface of the acetabular cup and the surface of the femoral stem part are provided with porous rough structures, and biological fixation of the artificial hip joint can be enhanced by arranging the porous rough structures; an extension part is formed at the bottom edge of the acetabular lining, and the dislocation of the artificial hip joint can be prevented by arranging the extension part.

The invention discloses a traditional Chinese medicine digital visualization system. The system comprises an infrared thermal imaging device and an infrared image workstation. The infrared thermal imaging device is used for collecting human-body heat radiation energy of an examinee; the infrared image workstation is used for adopting a bone-length measurement method for fitting human-body meridians and acupoints to a human-body thermal-state distribution image to obtain a traditional Chinese medicine digital human image according to a national standard meridian acupoint map and in combinationwith important body surface mark points of a human-body anatomical structure; then temperature data extraction, calculation and analysis are conducted on the traditional Chinese medicine digital humanimage to obtain a traditional Chinese medicine digital visualization analysis report. The invention further discloses a traditional Chinese medicine digital visualization method. By means of the traditional Chinese medicine digital visualization system, the standard meridian acupoints are fitted to the digital human-body thermal-state distribution image by means of the bone-length measurement method, the traditional Chinese medicine digital human image which better accords with the actual condition can be obtained, and an accurate quantitative basis is provided for subsequently utilizing theimage for data extraction calculation, and analysis to obtain the dialectical result according to traditional Chinese medicine theories.

The invention provides a preparing method of an antibacterial three-dimensional porous bone implantation material. The preparing method includes the steps of performing surface activating treatment onthe three-dimensional porous bone implantation material to obtain a preprocessed material; performing micro-arc oxidation treatment on the preprocessed material to obtain an in-situ growing film layer formed on the surface of the preprocessed material and provided with antibacterial ions, wherein electrolyte adopted for micro-arc oxidation treatment includes antibacterial ions and functional substances, and the antibacterial ions are any one of or more of zinc ions, copper ions and silver ions; and performing hydrothermal treatment on the in-situ growing film layer to obtain the antibacterialthree-dimensional porous bone implantation material. The antibacterial three-dimensional porous bone implantation material obtained through the preparing method has an antibacterial effect. The macroaperture and micro aperture of the antibacterial three-dimensional porous bone implantation material coexist, micro pores in a micro-arc oxidation film layer on a porous wall can provide anchoring points for bone ingrowth, meanwhile the specific surface area of the implantation material is effectively increased, and the implantation material has an antibacterial function and biological functionsof bone ingrowth and bone induction.

An angle calculating unit calculates a bending angle of a bone based on a plurality of surface points. A characteristic data calculating unit determines an indication value which reflects a load applied on the bone, a bone length of the bone, and a position of a fractured part. The characteristic data calculating unit calculates, as characteristic data reflecting a mechanical characteristic of the bone, a proportionality constant indicating a ratio between the indication value and the bending angle of the bone.

The invention discloses a personalized artificial sacrum prosthesis based on additive manufacturing, and relates to the field of medical instruments. The personalized artificial sacrum prosthesis based on additive manufacturing comprises a T-shaped main body and locking pieces, wherein the T-shaped main body comprises a longitudinally arranged bearing area and a connecting area transversely arranged below the bearing area. The personalized artificial sacrum prosthesis comprises the main body and the locking pieces, bears the lumbar vertebra and the pelvis and has high strength, high matching degree with a reconstruction area and natural bearing stability; screw fixing positions are accurate and sufficient, the bone mass of screw placing parts is rich, and the firmness is higher; A lightweight design concept is adopted, and the weight of an implant is reduced as much as possible on the premise of ensuring the strength of vertebral bodies; due to the arc design, a nerve root walking channel is reserved, and sacral nerve clamping and pressing are avoided; and the bone contact surface is rough and porous, instant stability and bone ingrowth are facilitated to form biological internal fixation, and personalized accurate reconstruction of a sacrum total incision bone defect area can be realized through detailed preoperative planning.

The invention relates to the technical field of auxiliary instruments, in particular to a middle and distal tibia tumor type prosthesis and a preparation device and method thereof. The preparation device comprises an image acquisition system for collecting tibia image data and a 3D printing system for printing a prosthesis model. The bilateral tibiofibula CT scanning is performed before an operation, the 3D tibiofibula of the affected side is reconstructed by reverse software, and the undercut range is expected corresponding to the tibia malignant tumor to make a middle and distal tibia tumortype prosthesis image to obtain intuitive understanding of the diseased tibia. The intraoperative prosthesis handle portion and the ankle mortise are compressed tightly with the host proximal tibia and the proximal talus osteotomy side, and fixed with multiple screws to complete the initial stabilization of the connection between two ends of the prosthesis and the host bone tissue. The porous surface of the proximal end of the prosthesis handle portion and the metal ankle mortise (a cavity at the ankle bone end) can promote the bone ingrowth, and the long-term postoperative stability is strengthened.

A measurement and judgment method for orthopedics diagnosis comprises the steps of providing bone resonant frequency and bone length as well as a correction parameter of a testee, and setting the resonant frequency, the bone length and the correction parameter into a formula for calculation to obtain the bone density of the bone. The correction parameter can be of a circumference parameter or a weight parameter. In the method, whether artificial coax joints are loosened is judged better through comparing the input fundamental frequency amplitude with the generated harmonic amplitude.

The invention relates to the technical field of biomedical metal materials and oral implantation medical instruments, and provides a bone trabecula porous tantalum dental implant and a preparation method thereof. The bone trabecula porous tantalum dental implant provided by the invention has a cylindrical structure and sequentially comprises a top functional area, a middle functional area and a bottom functional area from top to bottom. The top functional area is of a compact structure, the middle functional area has a bionic bone trabecula porous structure, and the bottom functional area hasa compact structure. The bone trabecula porous tantalum dental implant is integrally prepared by taking pure tantalum or medical tantalum alloy powder as a raw material through an additive manufacturing technology. The bone trabecula porous tantalum dental implant provided by the invention is high in friction force, close to human bone in strength and modulus, excellent in bone ingrowth effect, high in implantation stability and long in service life, is of an integrated structure, and has no risk of delamination and separation during implantation.

The invention provides a bone defect repair scaffold, and a construction method and a preparation method thereof, a computer-readable storage medium and equipment. The bone defect repair scaffold includes a bone defect repair scaffold body and a fusion surface layer. The contact surface between the bone defect repair scaffold body and a bone substance is provided with the fusion surface layer. Thebone defect repair scaffold body has a hollow inner cavity, the fusion surface layer is of a porous structure, and the bone defect repair scaffold is made of tantalum metal or tantalum alloy. The bone defect repair scaffold effectively avoids the stress shielding effect and reduces the risk of secondary fracture; tantalum metal or tantalum alloy is a biophilic metal, has no toxic or side effectson a human body, has excellent endophytic biological properties and has the function of promoting the bone defect repair; the porous structure of the tantalum metal or tantalum alloy is conducive to growth of newly regenerated bones into the material and good osseointegration effect is obtained.

The invention relates to a human body personalized hip joint femoral stem prosthesis adopting lightweight design and a manufacturing method thereof, and belongs to the field of medical instruments. The human body personalized hip joint femoral stem prosthesis comprises a handle neck, a handle body, a vertebral body and a vertebral tip, wherein the upper part of the prosthesis is triangular, and the inner side angle is 90-120 degrees; the handle body adopts a hexagonal honeycomb structure unit for lightweight design; the handle body and the vertebral body can also be subjected to lightweight design at the same time, the lightweight design can adopt irregular opening or closing structure design or 3D lattice structure design, and the structural unit is preferably a diamond unit, a rhombic dodecahedron unit or a truncated cube unit; and the vertebral tip adopts a solid structure design. Through extraction of personalized features of the solid model and forward design with light weight asguidance, light-weight design is achieved while personalized customization is achieved, the weight of the hip joint femoral stem prosthesis can be reduced on the premise that the mechanical property is met, maximization of the material utilization rate is achieved, and meanwhile, a large amount of space is provided for bone regeneration and bone ingrowth, and the stability is improved.

A surgical implant (10), comprising a porous structure (11) with interconnected pores (20) for ingrowth of bone into the porous structure. The porous structure comprises an arrangement of fibres (13,14) which are attached to one another, the fibres being arranged in layers (151, 152, 153), the layers being stacked. The porous structure comprises a surface (111), wherein the surface comprises different regions (112, 113) having different porosities. A method of making the above surgical implant is described.

The invention discloses a zirconium-niobium alloy tibial plateau prosthesis containing an oxide layer and provided with bone trabecula as well as a preparation method. According to the method, zirconium-niobium alloy powder is used as a raw material, an intermediate product is obtained through 3D printing integral forming, and then the tibial plateau prosthesis comprising a near-plateau support bone trabecula layer and a far-plateau support bone trabecula layer is prepared through hot isostatic pressing, cryogenic treatment and surface oxidation, the pore diameter and porosity of the near-plateau support bone trabecula layer are uniformly arranged, and the pore diameter and porosity of the far-plateau support bone trabecula layer are arranged in different areas; the bone trabecula topological structure of the tibial plateau prosthesis is in three-dimensional gradient distribution, the micro-strain of 64%-72% of a finite element model is between the lowest effective strain threshold value and the hyper-physiological strain threshold value, the mechanical adaptability of the prosthesis is improved, and the prosthesis has excellent bone ingrowth performance; and the oxide layer of thetibial plateau prosthesis can integrally realize excellent biocompatibility of an osseointegration interface and superhigh wear resistance and low wear rate of a friction interface.

Using a bended puncturing needle, a through hole from the greater trochanter of a long tubular bone to the bone marrow cavity is formed, the catheter 61a, 61b is passed into the through hole, a physiological salt solution is injected from one of the catheter 61b, and the physiological salt solution and the bone marrow is stirred by the stirring wire 68, the obtained mixed liquid is aspirated and harvested by another catheter 61a, thereby a large amount of the bone marrow is harvested. A method enabling easy and a large amount harvesting of the bone marrow from long tubular bones such as femurs, in which a multi-lumen catheter can also be used as a catheter.

The present invention provides a pelvic prosthesis. The pelvic prosthesis comprises an acetabular cup, an ilium support and a pubis plate are respectively arranged on the acetabular cup, an ilium support connecting plate is arranged on the ilium support, and tantalum coating porous bone trabecular interfaces are arranged at a contact part of the ilium support connecting plate and an ilium, a contact part of the pubis plate and a pubis, and a contact part of the ilium support and human body; a shape of the ilium support is irregular polygon, a plurality of locking long nail holes are arranged in the ilium support, axial directions of the plurality of the locking long nail holes are different, and locking long nails penetrate through the locking long nail holes of the ilium support to be connected with sacrum or lumbar vertebrae. The tantalum coating porous bone trabecular interfaces on the ilium support can ensure a sufficient bonding strength of the prosthesis and a host bone interface, improve long-term stability of the prosthesis in vivo and realize deep fusion of the prosthesis and a host bone tissue; the tantalum coating porous bone trabecular interfaces of the ilium support connecting plate increase stability and safety of the prosthesis and can play roles in mechanical support and bone ingrowth; and the locking long nail holes increase the stability of the prosthesis andreduce mounting difficulty of the prosthesis..

The invention discloses a motion data redirection method based on a neural network. The motion data redirection method comprises the following steps of based on motion data represented by joint coordinates, training by taking a motion reconstruction error as a loss function to obtain an auto-encoder; acquiring source motion data, calculating hidden variables corresponding to the source motion datathrough the auto-encoder, and reconstructing motion; applying a bone length constraint, a footprint constraint, a root joint position constraint and a bone angle constraint to the reconstruction motion, and reversely propagating constraint loss to an implicit variable space to optimize the implicit variable; through multiple iterations, the auto-encoder completing motion redirection from the source bone to the target bone. According to the method, the hidden variable corresponding to the source motion data is calculated through the auto-encoder, the motion is reconstructed, then various constraints are applied to the reconstructed motion, motion reconstruction loss is propagated back to the hidden variable space to optimize the hidden variable of the auto-encoder, the redirected motion isfinally obtained through multiple iterations, and a good motion redirection effect is achieved.

The invention discloses a motion data denoising method and system. The invention provides a motion data denoising method and system. Motion data containing multiple different noises are mixed to serveas input data of the training auto-encoder. The corresponding accurate motion data is used as label data, the joint position error, the bone length error and the smoothness error are used as loss functions to train the autoencoder, and the obtained bidirectional circulation autoencoder can perform real-time denoising on the motion data. According to the denoising method and system provided by the invention, the support of a motion database is not needed in actual use, any type of noise contained in the training data can be removed, and the universality is good. Meanwhile, the self-encoder istrained by taking minimization of joint position errors, minimization of bone length errors and minimization of smoothness errors as optimization targets, and it can be guaranteed that motion data obtained after denoising are free of jitter, natural and real.