18 results about "Articular disc" patented technology

The invention discloses a model for screening temporal-mandibular joint disc anterior displacement. TMJ ADD risk probabilities are output according to data of a plurality of key features. Wherein the key features comprise the opening degree, the lateral movement of the left side of the lower jaw, the lateral movement of the right side of the lower jaw, the crowding degree of the upper dentition, the Wits value, the FH-NPo angle, the Co-Go, the ALFH / PLFH ratio and the G '-Sn-Pog' distance. After network deployment of the constructed model, interconnection and intercommunication are realized, so that primary hospitals and clinics can also utilize related indexes of a skull lateral position film in orthodontic routine examination and clinical examination results to screen the risk of temporal-mandibular joint disc anterior displacement before orthodontic treatment, the popularization rate of joint screening before orthodontic treatment can be greatly improved, and the screening efficiency of the joint before orthodontic treatment is improved. Therefore, the effect of clinical orthodontic treatment is guaranteed as a medical instrument.

The temporomandibular joint disc suture needle with the holding structure comprises a needle tube main body, and the two ends of the needle tube main body are a puncture end and a propelling end respectively. The holding mechanism is used for forming a transverse holding type holding structure, the propelling mechanism is used for suturing the joint disc, the puncturing mechanism is used for puncturing and anchoring the joint disc, the holding mechanism is arranged on the side portion of the needle tube body, and the propelling mechanism is assembled at the propelling end of the needle tube body. The needle tube has the advantages that the holding mechanism is arranged, the holding mechanism and the needle tube body jointly form a T-shaped transverse holding type holding structure, an operator can hold the needle tube conveniently, the situation that the operator exerts force difficultly during suturing is avoided, and it is guaranteed that fine suturing operation is carried out smoothly; the propelling mechanism is arranged to be matched with the puncture mechanism, the anchoring part can be stably pushed to the designated position of the temporomandibular joint disc, anchoring of the suture line can be achieved through one-time pushing, and operation is easy.

This invention provides a biomimetic training model for temporomandibular arthroscopic disc reduction and suturing. The biomimetic training model includes: a skull model with several traction positioning components; a simulated articular disc; a simulated joint capsule including a superior and inferior joint capsule, which are respectively connected to the upper and lower surfaces of the simulated articular disc; the superior joint capsule has an upper opening, and the inferior joint capsule has a lower opening; a temporal bone connector connected to the upper opening and detachably connected to the temporal bone of the skull model; a mandibular bone connector connected to the lower opening and detachably connected to the mandible of the skull model; and several traction components, one end of which is connected to the simulated articular disc, and the other end is adapted to be detachably connected to the traction positioning components, thereby adapting the shape and position of the simulated articular disc by connecting the traction components to the traction positioning components.

The present invention discloses a method for modeling an articular disc based on a structural mask and contrastive learning mechanism, which relates to the fields of artificial intelligence and medical image processing technology. The method comprises the following steps: S100, mask generation and mask parameter initialization; S200, mask parameter optimization; S300, association loss function determination; S400, boundary-enhanced contrastive learning; S500, articular disc model training; and S600, articular disc model output. The articular disc model constructed by the present invention solves the technical problems of blurred boundaries, incomplete morphological reconstruction, poor boundary point connectivity, and lack of structural symmetry that exist in the articular disc segmentation and reconstruction process.

The utility model relates to a 3D frame based on condylar process simulation, which comprises an elastic connecting device, an upper jaw assembly and a lower jaw assembly, the upper jaw assembly comprises an upper jaw horizontal rod, an upper jaw support and an upper jaw model, and the lower jaw assembly comprises a connecting rod, a lower jaw horizontal rod, a lower jaw support and a lower jaw model; the maxillary support is connected with the maxillary horizontal rod and the maxillary model, the mandible support is connected with the mandible horizontal rod and the mandible model, and the connecting rod is connected with the mandible horizontal rod. The two ends of the upper jaw horizontal rod are rotationally connected with the connecting rods through elastic connecting devices, and the connecting positions of the upper jaw horizontal rod and the connecting rods correspond to the condylar process positions. Compared with the prior art, the upper jaw horizontal rod and the lower jaw horizontal rod are connected through the elastic rope, the articular disc in the real situation can be simulated, the state that the condyle process is suspended by the ligament is reflected, and the movement track of the lower jaw and the movement mode of the condyle process can be observed conveniently.

The invention relates to the technical field of oral disease animal model construction methods, in particular to a construction method of a traumatic temporomandibular ankylosis animal model. The construction method comprises the following steps: selecting an anterior auricular region on one side of an experimental subject, avoiding temporal superficial artery and vein, passively separating from front to back along a zygomatic arch to a joint capsule, exposing a mandibular condylar process neck and part of the zygomatic arch, and separating a condylar process after opening the joint capsule; the outer side attachment of the joint disc is separated through the joint gap, the peripheral attachment of the joint disc is cut off after the joint disc is exposed, and part or all of the joint disc is removed; the joint space is exposed through horizontal blunt separation of the joint capsule, part of fibrous cartilage on the condylar process head is removed, and fossa articular cartilage is damaged; after being sober, the animals eat soft food, and the traumatic temporomandibular joint ankylosis animal model is obtained. Modeling is carried out in the mode that the condyle process and the temporal bone glenoid fossa part fibrous cartilage and the articular disc are removed in a surgical operation mode, and the animal model established in a composite trauma mode fits the complex pathological environment of human diseases.

The application provides a suture and anchoring device matched with a temporomandibular joint arthroscope and a use method thereof. The device comprises a suture needle and an anchoring device. The anchoring device comprises a device body in a through barrel shape, and a device head arranged at one end of the device body. The device head comprises a porous shell connected to one end of the device body, a film layer arranged on the porous shell for wrapping the holes of the porous shell, a temperature-sensitive gel layer filled in the porous shell, the temperature-sensitive gel layer being inflatable and changed into a gel solid state in a body temperature environment, a movable rod arranged in the device body, one end of the movable rod extending into the porous shell and the other end extending out of the device body, and an anchoring body wrapped around the outer periphery of the porous shell, the anchoring body being provided with a first anchoring line and a second anchoring line. The application reduces the surgical incision of the external auditory canal, realizes minimally invasive surgery, and after the anchoring device is screwed into the posterior slope of the joint socket and is coagulated, only two times of passing through the articular disc by the suture needle with a line and knot fixing are needed to complete the articular disc reduction and anchoring fixation.

The invention provides a temporal-mandibular joint disc segmentation measurement method and device, electronic equipment and a medium, and the method comprises the steps: detecting a temporal-mandibular joint region from a magnetic resonance image containing a temporal-mandibular joint, and cutting a temporal-mandibular joint region image; segmenting a temporal-mandibular joint disc contour and a condylar process contour from the temporal-mandibular joint area image; constructing at least one maximum inscribed circle located in the condylar process contour based on the condylar process contour, determining the direction of a reference line based on the center of the maximum inscribed circle, and taking the intersection point of the reference line and the condylar process contour as a condylar process vertex; identifying a joint disc anterior zone leading edge point, a joint disc middle zone thinnest center point and a joint disc posterior zone trailing edge point from the interior of the temporomandibular joint disc contour; and measuring joint disc information according to the condyle vertex, the reference line, the circle center, the joint disc anterior zone leading edge point, the joint disc middle zone thinnest center point and the joint disc posterior zone trailing edge point. Through the method, the measurement efficiency of the joint disc information is improved.

The invention discloses a manufacturing method of a functional jaw pad for temporomandibular joint disc-derived dentomaxillofacial deformity. The manufacturing method comprises the following steps: 1) determining a dentomaxillofacial deformity type of a patient; 2) determining a required condyle process moving direction; then, the condylar process positions of the uninjured side and the affected side are accurately adjusted in 3D design software; after the condylar process position is adjusted, the temporal-mandibular joint gap needs to meet the condition that the posterior gap and the anterior gap are not less than 2; the upper gap is greater than or equal to 2mm; the anterior tooth mandibular covering and the dentition midline of the patient are synchronously optimized in the condylar process moving process; 3) preparing an individualized functional jaw pad by using a 3D printing technology; and 4) realizing quantitative evaluation and safety guarantee of condyle movement through accurate adjustment of the condyle in design software and establishment of a grid reference frame. By improving the jaw position relation and the occlusion stability in advance, a better skeleton and joint foundation can be provided for postoperative tooth movement, and the recurrence risk caused by unstable joints in the orthodontic process is reduced.

The application discloses a high-strength and high-toughness composite hydrogel for articular disc replacement / repair, a preparation method and application thereof, and belongs to the technical field of biomaterials. The preparation method of the composite hydrogel comprises the following steps: taking cyclodextrin grafted polyurethane and polyvinyl alcohol as raw materials, and freezing-thawing circulation after blending to prepare the composite hydrogel. The composite hydrogel prepared by the above preparation method is disclosed. The application also discloses application of the composite hydrogel in preparation of materials for repairing or / and replacing the temporomandibular joint disc. The composite hydrogel is prepared by using the cyclodextrin grafted polyurethane water emulsion and polyvinyl alcohol for the first time, the preparation method is simple and easy to operate, the obtained composite hydrogel has the characteristics of high strength and high toughness, and can be used for preparing the materials for repairing / replacing the temporomandibular joint disc.

The application discloses a manufacturing method of a digital guide plate for temporomandibular joint cavity injection, and the CT and MRI data of a patient are subjected to image segmentation, three-dimensional reconstruction and image registration in a computer software, so that the models of the condylar process, the articular disc and the articular tubercle of the temporomandibular joint are obtained and the relative position relationship is confirmed, and thus the positions of the upper cavity and the lower cavity of the joint are determined. According to the patient's condition, the drug is injected into the upper cavity or the lower cavity of the joint, and the needle insertion position, angle and depth of the injector are simulated in the software. On the basis of the soft tissue of the maxillofacial part reconstructed by the CT of the patient, a 3D printing guide plate which can be attached to the surface of the soft tissue is designed individually, and the guide hole is determined on the guide plate in combination with the needle insertion position, angle and depth. The guide plate comprises a positioning wing for assisting installation and positioning and a preset needle insertion guide hole, and can be used for guiding the needle insertion of the injector and the drug injection in the joint cavity injection treatment.

The invention relates to a folding ruler with a plurality of flat links (1, 2) elongated in a longitudinal direction (L) which are connected in pairs via a joint connection (10) about an axis of rotation (D) in a pivotable manner, wherein - the joint connection (10) has a first articulating disc (11) fixed to a first member (1) and a second articulating disc (12) fixed to a second member (2), - the joint discs (11, 12) have mutually complementary locking means which lock into each other in a folded position and in an unfolded position of the links (1, 2) on the one hand, and in an angled intermediate position between them when the first link (1) is pivoted relative to the second link (2) on the other hand, - the joint discs (11, 12) have an outer diameter (A) that is smaller than a link width (B) of the links (1, 2), - the first joint disc (11) has a total of four internally and diametrically arranged detent through holes (13.1, 13.2, 13.3, 13.4) as detent means, - the second joint disc (12) has a total of two diametrically arranged detent projections (14.1, 14.2) as detent means with respect to the axis of rotation (D) and - the grid elevations (14.1, 14.2) are each arranged on an elastically flexible spring tongue (15.1, 15.2) of the second joint disc (12) on the inside.

This utility model relates to the field of lower limb assistive device technology, and more particularly to a power joint mechanism for a lower limb assistive device. The technical solution includes: a flexible joint assembly, which comprises a joint disc frame, a flexible disc disposed within the joint disc frame, a spiral spring disposed within the flexible disc, and two sets of limiting arc grooves formed on the flexible disc. Each set of limiting arc grooves contains a positioning pin. Leg components are disposed at the lower end of the joint disc frame and the upper end of the flexible disc. Each leg component includes a fitting plate, with a strap and an adjustment strap respectively disposed on both sides of the fitting plate, and a positioning post disposed on the strap. Compared to traditional complex mechanical structures, this utility model, through the coordinated arrangement of the flexible joint assembly and the two sets of leg components, results in a more compact overall structure, smaller size, lighter weight, and easier wear and use, as well as easier storage and portability.

The functional correction occlusal pad comprises an upper occlusal pad and a lower occlusal pad, wherein the upper occlusal pad covers a first maxillary permanent molar, a first maxillary premolar and a second maxillary premolar; the lower occlusal pad is fixed on the lower jaw tongue side of an oral cavity; the upper occlusal pad comprises an upper jaw fixing occlusal pad and an upper jaw forward movement occlusal pad, the upper jaw fixing occlusal pad is fixed at the upper jaw of the oral cavity, and the upper jaw forward movement occlusal pad is arranged in the oral cavity through adjustment and sliding of a forward movement assembly; the forward moving assembly comprises a first sleeve, an adjusting screw rod, a rotary adjuster, a second sleeve and a base plate, the first sleeve is embedded in the maxillary fixing occlusal pad and provided with a threaded hole, the base plate is embedded in the maxillary forward moving occlusal pad, the second sleeve is fixed to the maxillary forward moving occlusal pad through the base plate, one end of the adjusting screw rod is connected into the threaded hole in a threaded mode, and the other end of the adjusting screw rod is fixed to the second sleeve; the rotary adjuster coaxially sleeves the outer wall of the adjusting screw rod, and a plurality of adjusting holes are evenly distributed in the outer wall of the rotary adjuster in the circumferential direction. The occlusal pad can promote condylar process reconstruction and new bone regeneration, and can effectively improve mandibular retraction or deflection.

A method for constructing a temporal-mandibular joint disc anterior displacement screening model comprises the following steps: collecting clinical examination data and head shadow measurement data of a qualified patient, taking a temporal-mandibular joint nuclear magnetism upper temporal-mandibular joint disc anterior displacement diagnosis result as a real label, screening features for screening, and finally constructing the model. In the model construction process, a basic model based on the constructed model is determined firstly, then model parameters are defined respectively, and a required screening model is formed. After network deployment of the constructed model, primary hospitals and clinics can also use related indexes of a skull lateral position film in orthodontic routine examination and clinical examination results to screen the risk of temporal-mandibular joint disc anterior displacement before orthodontic treatment, so that the popularization rate of joint screening before orthodontic treatment can be greatly improved; therefore, the orthodontic treatment effect is ensured.

The utility model discloses an anchoring system for a temporomandibular joint disc reduction anchoring operation, which comprises a suture line anchored on a joint disc, an anchoring sheet for quickly anchoring the suture line and the joint disc, and a positioning nail for positioning the suture line, the suture line is arranged on the inner side of the joint disc, the anchoring piece is assembled in the middle of the suture line and arranged on the inner side of the joint disc, the positioning nail is assembled on the suture line, and the positioning nail and the anchoring piece are arranged at intervals. In the operation process, the suture line and the joint disc can be connected without the operation of threading and line pulling, the operation requirement for an operator is low, the operation time is effectively shortened, and extra operation wounds caused to a patient are avoided; the anchoring force and stability of the positioning nail can be effectively improved, the falling phenomenon of the positioning nail is avoided, and the anchoring effect is guaranteed.

The invention discloses a temporal-mandibular joint magnetic resonance segmentation method, system and device based on deep learning and a medium, and the method comprises the steps: building a data set of a mandible nuclear magnetic image, and dividing the data set into a training set and a test set; building a hybrid segmentation model, wherein the hybrid segmentation model comprises an encoder based on a global context vision Transform structure and a decoder based on a convolutional neural network; setting model training hyper-parameters, and training the hybrid segmentation model by using the training set to obtain segmentation model parameters; using the test set to test parameters of the hybrid segmentation model and the segmentation model; and using the adjusted segmentation model and the segmentation model parameters to segment the joint disc and the condyle process in other images. According to the method, the mixed segmentation model of the mixed model based on the deep learning convolutional neural network and the Transform is established, so that the pixel-level shape information of the joint disc and the condyle process position in the mandible joint nuclear magnetic resonance image is accurately extracted.

The invention belongs to the technical field of magnetic resonance, and particularly relates to a temporal-mandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types, which comprises a magnetic resonance machine body, a fixed coil and a movable coil, the multiple fixed coils are arranged on the outer side of an inner cavity of the magnetic resonance machine body in a surrounding mode. The multiple movable coils are arranged in an inner cavity of the magnetic resonance machine body in a surrounding mode and located on the inner rings of the multiple fixed coils. Each movable coil is positioned between two adjacent fixed coils; the plurality of movable coils can move towards the center of the magnetic resonance machine body through a pushing mechanism; the movable coil can be tightly attached to temporomandibular joints of different head types through dynamic adjustment, the signal sensitivity and the image signal-to-noise ratio are effectively improved, and fine structures such as a joint disc are displayed more clearly. The problem that the imaging quality is unstable due to the difference of the head shape and the face contour of the patient is solved, and the consistency and the accuracy of diagnosis are guaranteed.