121 results about "Posterior cruciate ligament" patented technology

Total prosthesis of a knee including a femoral element fitted with two condyles, a first of the condyles being external, a second of the condyles being internal, and a tibial plateau fitted with custom-made recesses to hold the condyles, wherein at least one of the condyles is integral on one of its sides with a convex cam ensuring posterior stability of the prosthesis. The tibial plateau has at least one track placed in the immediate vicinity of the recess holding the condyle integral with the cam, the at least one track being circumscribed by at least one curved abutment and at least one horizontal recess between posterior and anterior extremities of the tibial plateau. Provision is made between the condyles of the femoral element and the recesses of the tibial plateau for a free space and a notch for passage of a posterior cruciate ligament of a knee.

There is disclosed a total knee replacement prosthesis, which can substitute the function of an anterior and/or a posterior cruciate ligament. A femoral component containing two intercondylar surfaces and an intercondylar region, a tibial component having a tibial platform and a bearing component, and a protrusion from the bearing component also are disclosed.

The invention relates to the field of medicine, in particular to an augmented reality operation navigation system for reconstructing anterior cruciate ligament. The system is constituted by augmentedreality glasses, operation navigation software for reconstructing the anterior cruciate ligament, binocular vision, labeling needles, femur joint labels, tibia joint labels, a computer and vision tracking software, wherein the operation navigation software, the binocular vision, labeling needles, femur joint labels, tibia joint labels and the computer are installed on the augmented reality glasses, and the vision tracking software is installed on the computer. Before an operation, diagnosis image CT data and MRI data are subjected to image fusing and division processing, three-dimensional reconstruction is conducted, and a reconstructed three-dimensional model is subjected to pre-operation planning; in the operation, the labeling needles are adopted to collect knee joint dissection joints,the collected knee joint dissection joints and the pre-operation knee joint model are rectified, and according to labeling of the tibia and femur, the knee joint three-dimensional model and a planning path are displayed in real time in the augmented reality glasses. According to the augmented reality operation navigation system for reconstructing the anterior cruciate ligament, precise locating of the starting point and the ending point of the anterior cruciate ligament can be achieved, the problem that an existing endoscope technique operation is narrow in vision is solved, and the operationrisks are effectively lowered.

The invention provides a tendon or ligament prosthesis having an undeployed configuration and a deployed configuration. The prosthesis has a resistance to tension in the undeployed configuration that is less than its resistance to tension in the deployed configuration. In the deployed configuration, the prosthesis is capable of twisting and bending. In one embodiment, the prosthesis has a meshwork of filaments woven, knitted or braided into a slender cylinder. In this embodiment, the prosthesis attains the deployed configuration by stretching the prosthesis from its undeployed configuration. The prosthesis may be used, for example, to replace an anterior or posterior cruciate ligament or to treat acromioclavicular joint separation, a rotator cuff tear, lateral collateral ligament tears, medial collateral ligament tears, or medial patello-femoral ligament tears. The invention also provides a method for replacing a tendon or ligament using the prosthesis of the invention.

Described herein are methods and devices for use in repair of a patient's anterior cruciate ligament (ACL). These methods (and devices for performing them) allow the repair, rather than merely replacement, of the ACL. For example, described herein are anchoring devices that may be inserted into a bone and may anchor a scaffolding/support (e.g., graft) material within the bone so that the torn or damaged end of the ACL may be secured to the scaffolding/support material within the femoral notch. These anchoring devices and method of using them are particularly well suited for use with the continuous suture passers described herein, since these suture passers may allow access to previously inaccessible regions of the knee (or other body regions).

Where a prosthetic joint component part has a relatively sharp edge which potentially can contact and thereby irritate or injure soft tissue juxtaposed with the component part at an implant site during articulation of the prosthetic joint, such as a posterior cruciate ligament juxtaposed with a component part of a prosthetic knee, the component part is provided with a deflector located, configured, dimensioned and directed for deflecting the soft tissue away from contact with the sharp edge during articulation of the prosthetic joint.

A device for a correctly targeted formation of a drill bore centrally in a femoral attachment site of a posterior cruciate ligament of a knee joint comprises a hollow shaft for guiding a drill wire therethrough and a sighting element arranged at a distal end of the hollow shaft. Said sighting element has an edge for placing said sighting element via said edge to an outer margin of a femoral attachment site of a posterior cruciate ligament.

The invention discloses a method for virtually building an anterior cruciate ligament on femur and tibia tunnels. The method comprises the following steps of firstly, carrying out straightening part nuclear magnetic resonance scanning and flexed part CT (computerized tomography) scanning on two keen joints of a patient with damaged anterior cruciate ligament, then importing the scanning data of the two keen joints into medical image reconstruction software to carry out three-dimensional reconstruction, then importing the three-dimensional data into reverse project software to further finish and beautify, then sorting and calculating various types of data of the femur, the tibia and the anterior cruciate ligament by using a computer, and virtually forming the entrance and exit of the anterior cruciate ligament on the femur and the tibia, and marking points on the surfaces of the femur and the tibia. The method is suitable for realizing the ACL (anterior cruciate ligament) accurate positioning and implanting of individuals, and is an effective new path for improving the ACL restoration and reconstruction therapeutic effects, and a junior surgeon can carry out pre-operation planning, operation simulation and exercising, operation teaching, and instruction of practical operation and post-operation rehabilitation through the information in the virtual environment.

The invention relates to the field of medical science, and particularly relates to an anterior cruciate ligament stopping location and ligament tunnel location device combining with preoperative 3D planning information. The device comprises hardware such as a C-type arm X-ray machine, a gama correction calibration board, an image capturing card, a positioning robot, a path positioning rack, a position trailing platform, and a computer as well as software such as a 3D planning module and a 2D positioning and navigation module which are stored in the computer. The 3D planning module makes use of preoperative 3D image data of knee joints of a patient, assists a doctor in finishing personalized surgical planning, and projecting a 3D environmental message to a 2D navigation message along a specific projection direction. The 2D positioning and navigation module makes use of a 2D medical image in surgical space collected by the hardware as well as location information of various trailing objects and combines the 2D navigation message to construct a navigation environment to control the hardware such as the positioning robot and the path positioning rack to finish an accurate operation path positioning. The anterior cruciate ligament stopping location and ligament tunnel location device can assist the doctor in finishing the precise and personalized operation of anterior cruciate ligament stopping location and ligament tunnel location, thus lowering operative difficulties and enhancing operative treatment efficacy.

The invention relates to a knee joint anterior and posterior cruciate ligament femoral tunnel positioner. The positioner comprises a hook body, wherein the hook head of the hook body extends in the knee joint cavity and points to the anterior and posterior cruciate ligament femoral insertion; the long stem of the hook head is upward and above the front of the femur of knee joint and is connected with an arc chute which is arranged laterally; a curved lever which can slide relatively to the arc chute is embedded in the arc chute; and the movable end of the curved lever is provided with a drillstem guide sleeve which directly points to the tip of the ligament hook head. By adopting the positioner of the invention, the problem that the previous arthroscope can perform observation only through the lateral approach and the visual blind area is caused, can be solved; and the reconstruction of femoral tunnel can be better performed from the physical point of the ligament, thus the reconstruction of femoral tunnel in clinic has higher repeatability and operability, the accuracy degree of operations is greatly increased, the operating time is reduced, and the positioner has great use value and wide market space.

The invention relates to a posterior cructiate-retaining orthopaedic knee prosthesis having controlled condylar curvature. The orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and mid-flexion. Additionally, in some embodiments, the radius of curvature may be increased during mid-flexion.

The present invention relates to a device (1) for measuring the knee laxity, with or without use of additional means of diagnosis such as computed axial tomography and magnetic resonance imaging, evaluating the instability of the knee due to rupture of any ligament, namely the anterior cruciate ligament, posterior cruciate ligament, postero-internal capsule, postero-external capsule, as well as around the axis of an orthonormal referential, that comprises three parts respectively to accept and retain the thigh, leg and foot.

The device (1) includes independent means (20) and (21) to push backward the anterior zone of the leg and to push forward the posterior zone of the leg, and independent means (12) and (13) to push the part (5) for support and fixation of the foot in clockwise direction and in anti-clockwise direction.

The invention discloses a force-closed knee replacement prosthesis which is composed of a thighbone prosthesis, a thighbone support, a shin bone support, a rotating link rod component, an anterior cruciate ligament branched chain and a posterior cruciate ligament branched chain; the thighbone prosthesis is arranged on the thighbone support, and the rotating link rod component, the anterior cruciate ligament branched chain and the posterior cruciate ligament branched chain are arranged between the thighbone support and the shin bone support. The patellar surface profile of the thighbone prosthesis is a 3D thighbone patellar surface profile which is re-built by thighbone CT/MRI scanning based on knee joints of a replaced person. In the force-closed knee replacement prosthesis, the anterior cruciate ligament branched chain adopts a fixed long rod piece structure, and the posterior cruciate ligament branched chain adopts a spherical hinge with a spring structure to be connected, so as to avoid the phenomenon of negative bending angle and overlarge bending angle in the bending/stretching process of the joints and be capable of realizing bending movement of the knee joint prosthesis within a range of from 0 degree to 135 degrees.

A prosthetic knee with an artificial ACL/PCL. The prosthetic knee includes a femoral component and a tibial component. The artificial ACL/PCL connects the femoral component and the tibial component and includes an anterior cruciate ligament portion connecting an anterior anchor point on the tibial component to a posterior anchor point on the femoral component, and a posterior cruciate ligament portion connecting a posterior anchor point on the tibial component to an anterior anchor point on the femoral component. The artificial ligament may be provided as single length of material and may be pre-assembled into an ACL/PCL module having portions that may be inserted into at least one of the femoral component or the tibial component. A system is also provided for total knee replacement that includes a selection of femoral components, tibial components, and one or more ACL/PCL modules of varying sizes,

This disclosure describes systems, methods, and apparatus for a knee brace providing a dynamic resistance or anterior force to a shank of a leg in order to replicate PCL forces of a healthy PCL. A dynamic force dependent upon knee flexion angle provides faster and safer PCL injury healing since the dynamic force better replicates the forces that a healthy PCL would exert on the tibia and femur.

The invention relates to a posterior cruciate ligament protection device for total knee replacement. The posterior cruciate ligament protection device is characterized by comprising a handle, wherein one end of the handle is fastened and connected with an auxiliary plate; the inner surface of the auxiliary plate is of an arc-shaped structure; one end, far away from the handle, of the auxiliary plate is fastened and connected with a fixed protection plate; the inner surface of the fixed protection plate is provided with a groove structure; and the end part, far away from the auxiliary plate, of the fixed protection plate is provided with a cutting edge. One end of the handle is fastened and connected with the auxiliary plate for covering a thighbone trochlear groove, and the fixed protection plate inserted into the tibial plateau sclerotin is fastened and connected into a position, far away from the handle, of the auxiliary plate, so that in the use process, the tibial plateau can be forwards pushed out relative to the thighbone by using the lever principle; and the convenience is brought to osteotomy. The inner surface of the fixed protection plate is provided with the groove structure, so that the posterior cruciate ligament and the posterior cruciate ligament bottom dead center can be covered and protected, and the posterior cruciate ligament tibial lateral bottom dead center avulsion fracture in and after the operation can be prevented.